GENERATORS

Why We Need The Solar Power Generator

noreply@blogger.com (ADMIN) — Mon, 02 Apr 2012 14:00:00 +0000

Having an alternative source of energy is a must in the future. Everyone ask WHY? In this article we will discuss the need of solar power as an alternative source of Power. Also, we will know how to build a solar panel in our home.

Why We Need Solar Power?

There are two main reasons for the need of renewable source of power. First of all is: the cost of traditional energy is becoming more expensive due to the more usage of electricity coming from declining source of fossil fuel.

This fossil fuel is the main source of electricity. However, it is also the main source of very high levels of Carbon Dioxide in our atmosphere which causes Global Worming. It is the time to help our environment.

Secondly, acquiring this type of technology (solar power) is no longer expensive. Everyone have to know that utilizing solar power is no longer costly but within his means. Also, obtaining solar power has become much easier for use at our home. In the following section, we will know more about building our own solar power generator to supply our houses with electricity.

How To Build A Solar Power Generator?

Building a solar power generator is very simple. Any solar power system consists of only two simple components: the photovoltaic cells and the panels. The photovoltaic cells are responsible of converting the sunlight to electricity. Panels are simply made of wood and glass. The solar powered panels will survive for long times considering the long life of glass and its capability to exposure to the rays of sun.

Ready guidelines and CD's coming with solar panels will take you step by step to build your system. First, you have to find the place which is the most exposure to the sun. This place may be on the roof, on the yard, or in the garage.

Take the photovoltaic cells and locate them flat in the place which is chosen for the panels. Organize them horizontally to allow sunlight to enter to the solar powered panels which collect these rays and keep the solar energy that will be converted to electrical energy by the photovoltaic cells. This stored energy in solar panels can be used at any time when the sky is cloudy or at night times.

Summery

1. Having a renewable source of power is no longer an option, but it is becoming a must. Solar Power achieves this target.

2. Fossil fuel is the primary source of energy. It is very dangerous and contaminate our environment. Also, fossil fuel will finish in the near future. So, the best alternative is utilizing the solar energy for the future of our children.

3. Building a solar panel is very simple and inexpensive. No more than $300 are required to build your own solar power generator in order to supply your home with electricity. A small corner of your roof will provide you with no-noise and no-dust power source.

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Wind Electricity Basics

noreply@blogger.com (ADMIN) — Mon, 12 Dec 2011 12:28:00 +0000

Small wind-electric systems can provide electricity on remote, off-grid sites, or right in town connected to the utility grid. Although wind systems require more maintenance and need more attention than solar-electric or microhydro-electric systems, if you invest up front in good equipment, design, and installation, wind-electric systems can make economic and environmental sense. They also bring a great deal of satisfaction—there´s nothing quite like watching your wind generator convert a summer breeze or a winter storm into electrical energy.

How It Works

Boiled down to its simplest principles, a wind generator´s rotating blades convert the wind´s kinetic energy into rotational momentum in a shaft. The rotating shaft turns an alternator, which makes electricity. This electricity is transmitted through wiring down the tower to its end use.

The blades use engineered airfoils, matched to the alternator, that capture the wind´s energy. Most modern wind generators use three blades, the best compromise between the highest efficiency possible (one blade) and the balance that comes with multiple blades. Together, the blades and the hub they are attached to are termed the rotor, which is the collector of the system, intercepting winds that pass by. Most turbines on the market today are upwind machines—their blades are on the windward side of the tower. A few downwind machines are available, but neither configuration has a clear performance advantage over the other.

In most small-scale designs, the rotor is connected directly to the shaft of a permanent magnet alternator, which creates wild, three-phase AC. Wild, three-phase electricity means that the voltage and frequency vary continuously with the wind speed. They are not fixed like the 60 Hz, 120 VAC electricity coming out of common household outlets. The wild output is rectified to DC to either charge batteries or feed a grid-synchronous inverter. In most designs (up to 15 KW in peak capacity), the rotor is usually connected directly to the alternator, which eliminates the additional maintenance of gears. In systems 20 KW and larger, as well as some smaller wind systems (like the Endurance, Tulipo, or Aircon), a gearbox is used to increase alternator speed from a slower turning rotor.

The blades must turn to face the wind, so a yaw bearing is needed, allowing the wind turbine to track the winds as they shift direction. The tail directs the rotor into the wind. Some sort of governing system limits the rotor rpm as well as generator output to protect the turbine from high winds. A shutdown mechanism is also useful to stop the machine when necessary, such as during an extreme storm, when you do not need the energy, or when you want to service the system.

How Wind Turbines are Rated

Wind turbine rating is a tricky affair. While solar-electric module or microhydro-electric turbine production can be predicted fairly realistically based on rated output, this number is very misleading with wind turbines. Why? Because rated output is pegged to a particular wind speed, and different manufacturers use different wind speeds to determine rated output. Also, the power available in the wind varies with the cube of its speed, so small increases in wind speed result in large increases in power available to the rotor. A 10 percent increase in wind speed yields a 33 percent increase in power available in the wind. Conversely, this means that a turbine rated at 1,000 watts at 28 mph might produce only 125 watts or less at half that wind speed, 14 mph.

So what´s a wind turbine buyer to do? Ignore the peak output and the power curve. Look for the monthly or annual energy numbers for the turbine, estimated for the average wind speed you expect or measure at your site. These will be given in KWH per month (or year) in the manufacturer´s specifications for each turbine. Energy is what you´re after, not peak power! If, for example, you are looking for a turbine that can produce 300 KWH per month, and you know that you have a 10 mph average wind speed at the proposed turbine height, you can shop for a turbine that is predicted to generate that much energy in that average wind speed.

If you can´t get energy production estimates from the manufacturer or a turbine owner, look for a different manufacturer. This is basic information that any manufacturer should supply. However, knowing a turbine´s swept area may also help you calculate the annual energy output for the wind turbine. All other things being equal, ″there´s no replacement for displacement.″ Hugh Piggott gives a rough formula for calculating output based on average wind speed and swept area in his HP102 article. Jim Green at the National Renewable Energy Lab (NREL) developed a similar formula: annual energy output (AEO) in KWH = 0.01328 x rotor diameter (ft.) squared x average wind speed (mph) cubed.

A turbine´s revolutions per minute (rpm) at its rated wind speed can give you some idea of the relative aerodynamic sound of the machine, and also speaks to longevity. Slower-turning wind turbines tend to be quieter and last longer. High rpm machines wear out components, such as bearings, much faster. In addition, the faster blades move through the air, the greater the possibility that they will waste some of that energy as sound from the blades.

How To Choose A Wind Turbine

Trying to keep an inexpensive wind generator running can be an uphill battle that you´ll soon tire of. But expect to pay more for a better machine—it´s a tough job to design and manufacture a long-lasting, small-scale wind generator.

The bottom line: Buy a turbine that has a very good track record and a good warranty—five years is preferable but not always available in the small wind industry. A warranty is one indication of the manufacturer´s confidence in their product, and their intention to stand behind it.

Real-world reports from users carry even more weight than a warranty, so search for people who own the model of turbine you´re considering buying, and get the straight scoop from them about performance, durability, reliability, and maintenance issues.

Note that a number of the wind turbines listed here are relatively new introductions with not very much customer run-time in North America. These turbines include the ARE, Eoltec, Kestrel, and Skystream. We recommend that you contact either your local wind turbine installer, or the manufacturers or importers and find out how many of these machines are actually operating in North America. Then contact the owners, and inquire about their experience and satisfaction with both the machine and the manufacturer or importer.

Some manufacturers make only battery-charging machines, and may offer a variety of turbine voltages. Others produce machines intended to connect to grid-synchronous inverters without batteries. One machine even includes an inverter integrated with the turbine itself. Make sure you´re buying a machine that is appropriate for your intended use.

When you look at prices, keep in mind that just buying a wind turbine will not get you any wind-generated electricity. You´ll also need most or all of the components mentioned elsewhere. Also budget for equipment rental, like a backhoe and crane, concrete and rebar, electrical components, shipping, and sales tax. Unless you do all of the work yourself, also factor in installation labor expenses. These costs can add up significantly, so make sure that you research and understand all of the associated expenses before committing to a purchase. Many people are quite surprised to learn that the wind turbine cost can range from only 10 percent to as much as 40 percent of the entire wind system´s expenses.

Small-scale wind energy is not for the half-hearted, uninvolved, or uncommitted, and probably not for folks who never change the oil in their vehicles (or are willing to spend the bucks to hire someone to do the tower work). The North American landscape is littered with failed installations: Designs not fully thought-out or tested, machines bought because they were cheap, and installations that required more time and money for repairs than they ever yielded in electricity generated. Many of the failures were the result of wishful thinking and too little research. That said, there are tens of thousands of happy wind-electric system owners. These owners did their homework—purchasing, designing, and installing rugged and well-thought-out systems on adequately sized towers. In addition, they are either committed to maintaining the systems, or to hiring someone to do this regular work.

While many first-time wind turbine buyers may be looking for a bargain, second-time wind turbine buyers are seeking the most rugged machine they can afford. You can avoid a painful "learning experience″ by focusing on durability, production, warranty, and track record, and not on price alone, or on peak output. You don´t want to depend on the low bidder for something as important to you as your long-term energy investment.

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How to Build a Wind Generator From a 24 Volt Alternator

noreply@blogger.com (ADMIN) — Fri, 09 Dec 2011 11:47:00 +0000

Alternators rated at 24V DC are inexpensive and rugged but must rotate too quickly to be driven directly by a wind turbine. Wind turbines typically rotate at several hundred RPM while alternators must rotate at speeds of at least 1000 RPM to generate their rated voltage and power. To build a wind generator using such an alternator, a belt and pulley system which multiplies the speed of the wind turbine must be installed. Typically a factor of three or four is needed to get the speed required for the alternator to operate properly.

Large wind turbines rotate slowly and need gears or a pulley to drive an alternator.

Instructions

· Calculate the size of the pulley and estimate the length of the v-belt. Measure the diameter of the pulley on the alternator. Multiply by four to get the diameter of the pulley for the rotor. Calculate the circumference of the alternator pulley by multiplying the diameter by 3.14. Multiply by four to get the circumference of the rotor pulley. Add each of the circumferences to get the approximate length of the v-belt.

· Attach the wind turbine blades to the pulley. Measure to make sure the blade-tip-to-blade-tip and blade-tip-to-pulley-center distances are all the same. Check the balance of the assembly by supporting the pulley in the center and checking the weights at the blade tips. Balance by adding small weights glued to the blades.

· Cut a one-foot long slot into the center of one end of the two-by-six and insert the sheet metal. Bolt into place. Mount the bearings at the other end and insert the shaft with the shaft collars to prevent the shaft from slipping out. Mount the pulley with the rotor blades on the shaft. Make sure the rotor has enough clearance to spin freely.

· Insert the alternator into the plastic pipe and bolt into place using the alternator's existing mounting holes. The pipe should be wide enough to allow ventilation but long enough to protect the alternator and the wiring from the elements. Make sure the alternator pulley has enough clearance for the v-belt.

· Mount the pipe under the two-by-six with pipe clamps. Place the v-belt over the pulleys and insert shims between the pipe and the two-by-six so that the v-belt is tight with flexibility of about half an inch. Mount the assembly at the top of the wind turbine tower.

Source: http://www.ehow.co.uk/

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How Does a Wind Generator Work?

noreply@blogger.com (ADMIN) — Thu, 08 Dec 2011 10:46:00 +0000

What is a Wind Generator?

A wind generator is better known as a wind turbine; the term “wind generator” implies a fan device that creates wind. In fact, a wind turbine is designed to convert wind into electrical energy. Wind is a phenomenon that might be classified as a solar energy. It is caused by differences in air temperature resulting from uneven solar heating. The earth’s rotation is a factor as well. The presence and strength of wind can be modified by such things as terrain and the presence of large bodies of water. For these reasons, there are certain parts of the world that experience consistent strong winds, which wind turbines are designed to take advantage of.

How Does a Wind Generator Work?

Structure

Every turbine is placed high in the air at the top of a large pole. The turbine looks similar to an airplane engine prior to the invention of jets. At the forefront is a large propeller, behind which is an enclosed casing. Inside this casing is a rod from the propeller leading to a gearbox. Connected to the back of the gear box is an electrical generator. Raised from the back of the casing is an electronic wind gauge connected to the generator for power. Beneath the casing, inside the top of the pole is a device called a yaw motor, atop which is welded the casing, standing free from the pole.

How Does a Wind Turbine Work?

Incoming winds brush past the curved edges of the propeller, turning it as they go. The turning propeller rod initiates the gearbox, translating a slow but high-torque turning motion into a very fast but low-torque motion in a gear extending from the gearbox to another gear that is connected to the generator. The two gears turn, generating a continuous electrical charge. This charge is used to power the wind gauge, which is able to determine from which direction the wind is coming. The gauge sends a signal down to the yaw motor, making the casing and entire propeller turn to face the wind directly, regardless of how the wind changes. The excess electricity is sent down a cable threading through the center of the pole to the ground. From here the cable connects to a large battery connected to the local power grid to serve the electrical needs of the local populace.

Source: http://www.ehow.co.uk/

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Best Generators For Home Use

noreply@blogger.com (ADMIN) — Wed, 07 Dec 2011 10:31:00 +0000

Maybe you have thought the require for more power? Have you been experiencing power aftermarket clutches in your community and also would like to have got a consistent power supply? Effectively, then you certainly ought to now look at choice power supplies which has been provided for frequent make use of.

Many thanks to technology, were now in a placement to use un-captured normal systems found in world. Sunshine and blowing wind electricity can easily be employed to tap energy and convert the same in to useful energy. Generators for home use can are now using these kind of two naturally offered energy sources to utilize the electrical power generated in order to power the house.

There are several organizations that have forayed into manufacturing home centered solar panels, wind generators and also portable generators which will assist a home user identify the exact same in order to tap the vitality from wind flow as well as sun's rays to convert the very same into beneficial electricity that they can connect to the primary power supply therefore delivering continuous energy and in addition lessen the energy bills which usually a home person makes sense to the neighborhood power syndication company. Generators for home use have given many individuals the chance to lessen his or her energy bills substantially.

Let's take into account a small illustration which usually will make you recognize the importance of generators for home use. If you are found along the coastal region of the country you've the highest likelihood of reaching high speed really agitates which you can tap with the support of wind generators that will turn the power in to energy which you can make use of to power increase home. These windmills were created along with installed together with the essential generator which usually will develop the needed volume of electrical power for a home consumer. Although the installing is pricey you might be concerning to make an one-time investment on this type of venture so that you can no longer possess to pay out high-priced energy bills to your local power syndication organization.

A part from this in addition, you receive an uninterrupted power supply that you simply always needed to have got without the imbalances. There are numerous service companies obtainable in the market that delivers generators for ho4me employ for example portable generators, photo voltaic generators along with diesel powered generators. Portable generators are of help for those people who are looking for consistent power supply to carry out their activities without the bust. These kinds of generators are generally attached to the main power supply of the home. The identical should go for possibly solar power as well as wind power.

Since you have recognized the relevance of generators for home make use of, search for the greatest alternative that suits in your conditions plus your needs that will will provide you total backup and constant circulation of electrical energy without disrupting your everyday pursuits.

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Generator Transfer Switches

noreply@blogger.com (ADMIN) — Wed, 21 Sep 2011 13:22:00 +0000

For various reasons, every year the number of times power outages occur and interrupt in our daily activities increases. Big companies lose thousands of dollars of investment on their equipment and transactions due to power outages. Homeowners also experience damage on their appliances and planned events due to unexpected power interruption. It is therefore vital for every facility that relies too much on electricity to install a backup power supply like a generator. These provide a backup power supply so activities could go on smoothly by converting mechanical energy, from its source such as diesel, natural or propane gas; to electrical energy and restore enough electricity for your home appliances and other equipment. Generator transfer switches are the best feature of this equipment because it can detect power interruption and disconnect the utility power and automatically transfer the power source to that of the device. Once the power is back, it also automatically returns the power source from that of the unit to the utility power.

Automatic Transfer Switch

Generator transfer switches are designed to aid in supplying power from multiple power sources to an electrical circuit. They are generally required or integrated in any backup generator because it isolates the generator source from the utility system once your backup solution is installed in your wiring system. Portable generators do not come up with these switches because the user does the power transfer manually and it can only supply from one to three equipments depending on its energy backup capacity. They can be installed manually in standby devices too. Other options include automatic or a combination of both. Their layout and design could be either simple or sophisticated depending largely on the circuit setup. They also have the capacity to send power to a single circuit or multiple circuits. That means it can accommodate up to maximum of 3-4 appliances attached to it!

Wiring of Home Generator

The two most common types of general transfer switches are manual and automatic. The former are generally lesser expensive and much lesser complicated than the automatic because it only needs someone on-site to start and shut down the generator. There is no complicated wiring or maintenance required. The automatic transfer switches monitor that power supply and as the name implies, it automatically switches from the normal source or utility supply to the generator power source once a power interruption or outage is detected. They have an alarm and several different features and can switch power supplies without the need for an on-site technician to preside over the transfer of power.

For more details about Transfer Switch, please visit the following site: ATS SIMPLY

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Whole House Generator

noreply@blogger.com (ADMIN) — Sun, 18 Sep 2011 13:25:00 +0000

These days, owning a whole house generator has become a great necessity. This is because power outage and emergency power cuts have become very common. These emergencies tend to disturb daily chores and other important events of an individuals offices, residential areas, hospitals, schools and colleges cannot work without a standby generator. There is no need to mention commercial areas and other services. A standby generator is a must-have for everyone irrespective of the areas or the job of an individual. In earlier days, owning a generator was considered luxury. This is no more the case. To day, it has become more than a necessity.

A whole house generator is one of the most popular choices among varied types of generators available on the market for consumer use, these days. There are several reasons for the popularity of these devices. Most families have big houses with many electrical appliances running together. Hence, it has become very difficult to keep all the appliances running together during a power outage. Generators running on smaller watts are not able to run all the appliances available in a house. It is also very difficult for a family to survive all essential daily chores without electricity for a short time.

Hence, it is very important to purchase a whole house generator. This device, when installed in a house is capable of running all major necessity equipments. You can also install a manual transfer switch in order to switch over to a standby generator. This is very convenient and helps you to start the unit whenever the power outage problem arises.

Most of whole house generator tends to restore full electric power to your house within just about ten seconds. All they require to do is to reset all your digital clocks. There is a facility of an automatic transfer switch also runs the motor and generator weekly or even within two weeks. This is to make sure that the device is in a great working condition whenever required.

For most household requirements, the best option would be a ten kilowatt to fifteen-kilowatt output standby generator that provides adequate power.

Most models available under this range are usually powered by propane or natural gas. These are very efficient and extremely affordable to operate.

Whole house generator models operating on diesel are also available models running on natural gas or propane consists of a small one or two cylinder engine inside. Running on these will keep the environment clean and related requirements. Units running on diesel tend to be very efficient and require little maintenance as compared to others that require oil change and refilling after every hundred-operation hours.

Most standby generators tend to measure only as big as an air-conditioner does. The small gas or propane engines operate silently. The automatic transfer switch is located on the wall very near to circuit breaker panel indoors.

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Home Emergency Generator

noreply@blogger.com (ADMIN) — Sun, 18 Sep 2011 12:29:00 +0000

A home emergency generator is a device that functions towards supplying adequate electricity to your house during the time of power outages. It facilitates the usage of all essential appliances during a black out. One can easily continue using heaters, air conditioners, refrigerators, lights and heaters.

A home emergency generator can be technically referred to as a device that converts mechanical energy in to electric energy. The AC power generators made specifically for household usage tends to use small engines in order to give out mechanical energy. The engine consists of a spinning shaft that is utilized to produce alternating magnetic field via a coil.

There are several things one needs to take into consideration when choosing a generator. Home generators are usually stationary or portable. These tend to run on a varied variety of fuels including diesel, liquefied petroleum gas (LPG), gasoline, natural gas (NG) and diesel.

It is surprising but true that you can easily get a 3000 W set for yourself for just about $300. However, the only problem with these is that these models provide very short time. You may require refilling the tank for about several times a day. This is especially true when you want to run them consistently at a rated load.

These are also not suitable for long-term backup because there may be problem in gas pumps during a total black out. In case, you are looking for a home emergency generator that will work well for long term emergency, you need to look for a standby set. These sets are efficient enough to provide consistent power as these they depend on an external source of fuel. These sets are also efficient enough to fuel portable devices from an external source. This helps you to benefit form extended run time.

The major difference between a portable and stationary source lies in the connection and activation of these devices. A portable device requires rolling out from the storage and connecting to loads. This is followed by filling of fuel or connecting to fuel source and starting the set manually.

A permanent standby generator can be started instantly by a just of a button or automatically. This is in contrast to all the effort that goes in to starting a portable generator. This is because a standby generator is already connected to the wiring of the house as well as to the fuel source.

Automatic systems come with auto transfer switches that are capable of sensing a power outage. These can even isolate your electrical wiring or emergency circuits from the grid and start the system immediately. As soon as the power is restored, a standby system functions towards connecting you back to the utility lines and then turns it off. You do not require being present in order to activate it. The usual transfer time of such a system is about 10-30 seconds. In case, you run a PC, you require UPS to prevent any king of data loss.

There are also other benefits of a standby home emergency generator other than automatic start facility. One of the major benefits include running of the system for an infinite period. These also provide higher levels of power as compared to portables. The power ranges from 3 KW to hundreds of KW.

All the above-mentioned benefits tend to make a standby home emergency generator, a perfect choice for long-term emergency.

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Standby Generator

noreply@blogger.com (ADMIN) — Fri, 16 Sep 2011 13:02:00 +0000

What is a Standby generator?

A standby generator can be referred to as a tool that generates required electrical power during a power breakout. It is a good example of a back-up electrical system that operates automatically. All it requires is just some seconds of utility outage to let the switch know about a power loss. This automatically lets a generator start functioning.

A standby generator starts providing power to the circuit as soon as it senses power loss. Once the utility power is back, there is an immediate transfer of electrical load back to the utility with the help of a transfer switch and the generator is commanded to shut off. Once it has been shut off, the standby mode is activated. There are self-tests conducted by these devices on a weekly basis to make sure that there is a proper response to a utility outage.

Standby generator can be efficiently run on the following fuels:

• Diesel

• Natural gas

• Liquid propane gas

Types of Standby generators:

a) Home standby generators:

This is the best choice of electrical generator usage in homes. A standby generator is ideal for home use because it can be easily fuelled with varied options such as propane, natural gas etc. Homes already using these types of fuel would definitely be benefited from this. Homes vulnerable to certain emergencies can be benefited from using other fuel types.

b) Portable generators:

These are gasoline driven generators. These standby generators are specifically designed to be easily utilized with appliances that have cords attached to them. Portable generators can be conveniently used in remote locations including construction areas and camping sites. However, it would be wise not to try personally installing these generators.

c) Fixed generators:

These are usually large sized generators connected directly to the wiring of the building in order to supply good amount of standby power during the time of power outrages and emergencies. However, you need to make sure that a qualified electrical contractor installs the wiring properly. Never ever, try to install a fixed generator all on your own.

Safety tips and precautions:

There are several safety concerns you need to take into consideration when it comes to standby generators.

Since most of these generators are located inside an enclosed container outside the house, the risk factor may be lower but there is still some risk one needs to consider. You can easily ward off this risk via using a good CO detector such as smoke detector.

Another precautionary you need to maintain is getting the generator installed professionally. This will keep the fire or explosion possibility away. You must also read and follow all the instructions available on the operations manual of a standby generator.

Always keep the safety tips given on the instructor manual in mind prior to using the standby generator. Also, read the brochure properly prior to following these tips.

Standby generators are a great choice to generate power during emergencies.

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Zero Point Magnetic Generator for Indefinitely Free Electricity

noreply@blogger.com (ADMIN) — Wed, 14 Sep 2011 10:26:00 +0000

A zero point magnetic power generator functions as an electric generator which often operates by making use of magnets to employ energy. There are some people who may find this being hard to believe even though this is a simple fact. A magnet contains electrical power although doesn't have to have a good power input. Whenever you try to connect the very same polls against each other on a magnet, you will likely experience the power rejecting them. This really is precisely how a magnetic generator makes use of magnets to generate electricity so that you can power up a home.

A zero magnetic generator works by using over unity magnetic force in order to stimulate frequent action. The generator functions independently and does not ever stop. This will probably provide One hundred percent free energy, which in turn can power up your household for almost no cost. The primary process generates more electrical energy than it consumes, which will definitely produce cost free electricity.

There are plenty of advantages of a zero magnetic generator one of these is normally that it uses up very very small area and may be easily utilized in any size of home. Just in case this magnetic electrical generator is employed entirely, it could decrease your existing electricity bill completely out. Additionally, it may turn out to be utilized with almost any kind of environment whether it's ice freezing or warm. The person doesn't need to rely on any kind of external whether, including sunlight to power it.

A magnetic energy generator is generally incredibly eco- friendly as well as can never damage the surroundings. There are no pollutants being eliminated towards atmosphere, so this views it a remarkably safe and sound device. You won't detect any byproducts or toxic gases that may be unhealthy for people. The particular generator is perfectly safe without the need of worry related to combustion or flames.

In the event you decide on a zero energy magnetic generator it could definitely generate considerably more electrical power than somebody would really need, and in addition in many circumstances the electric company ultimately ends up paying you for your extra energy it creates.

If you make a choice to implement the Zero Point Energy Magnetic Power Generator on a full-scale, the item will separately power your household, meaning, you won't need to pay almost anything to the electricity company. This magnetic free electricity generator will continue to work on its own continually, and produce one hundred percent Free Electric Energy.

Source: http://EzineArticles.com

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Savings Lives: Electric Power Generators In Hospitals And Prisons Are Essential

noreply@blogger.com (ADMIN) — Tue, 13 Sep 2011 18:41:00 +0000

Anyone who has ever seen reruns of MASH can appreciate the importance of power generators in both medical facilities and military bases. In almost every episode it seemed, one of the characters would be hunched over a body on the operating table yelling for someone to fix the generator.

Yet only on a television series, one can see the importance of continuous access to power, which is amplified when the situation becomes life and death. In the real world as well, there are countless instances where the magnitude of having portable power generators is highlighted, especially in life or death situations.

Hospital Generators

One of the most significant uses of generators can be found in hospitals. Surgeons in the operating room cannot afford to be without power, even for a moment. The lives of other people are literally in their hands and risking the death of patients is never an option.

There are few things in America more important than the care and preservation of life. All measures imaginable for caring for a person and preventing their demise are taken at hospitals concerned with preserving existence.

Hospitals rely heavily on back-up generators to maintain life-sustaining equipment. Any loss of power, even for a few minutes, could result in the mass death of patient's dependant on ventilators and heart monitors.

Unlike typical emergency generators, the back-up system hospitals use has to go into effect almost instantaneously. Traditional generators require someone to start them and refill their gas supply. This would be a devastating wait for anyone needing a machine to breath for him or her.

Instead, hospitals have complex and sophisticated systems designed to kick in the second the power fails. Most generators have to be regularly refilled and can shut down when they run out of fuel.

Making sure that an essential generator never fails is accomplished by connecting the generator directly to the natural gas line of the hospital. In the event of an emergency the gas lines would still be able to properly supply fuel to the generator and, by extension, the hospitals.

Prisons

Hospitals are not the only facilities that require constant power. Power outages in prisons can also have disaster effects.

Prisons are packed with people who willfully disregard authority. Security measures are taken to ensure that they cannot leave. Many of these measures are done electronically. The loss of power in a place that relies on electricity for security purposes can prove just as fatal as a loss of power in a hospital.

In addition to security measures, prisons rely on electricity for ventilation systems and basic living standards. Jails are frequently overcrowded and men are cramped into spaces much to small for them to properly function, when the climate control systems goes out.

The basic premise of prison architecture is that there are multiple containment areas between the prisoners and the outdoors. Without electricity to pump air into the facility, oxygen levels can plummet quickly.

Additionally, the climate in an unventilated structure teaming with life can quickly rise to stifling levels, making comfort impossible. While comfort is not a serious issue, heat related injuries such as heat stroke are serious issues that all prison administrators have to contend. If a prisoner is spending a short amount of time in prison, and that person dies in prison as a result of a power loss and uninhabitable living conditions, then the prison administrators could find themselves financially liable for the death of their inmate.

Emergency back-up generators are very important to the health of inmates. While the speed with which they come on is not as important as it is for hospital generators, their durability is certainly critical.

Like hospitals, prisons typically have generators that tie into both their primary electrical system and their gas line. Their size is substantial, as they have to provide power to a considerable amount of space.

In Conclusion

We often take our world for granted. We assume that it will maintain its basic conditions indefinitely. For these reason, many do not properly prepare for emergencies.

Facilities that rely on electricity to save and maintain life do not have the option of simply not having the resources they need. Emergency generators have saved countless lives over the years, since their creation.

Proper installation and maintenance can insure that they continue to save lives for many more years to come. Emergency back-up generators that automatically begin providing power at the point of a power loss are tremendous investments for any institutional administrator concerned with preserving life.

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Magnetic Power Generator - Free Energy For Life

noreply@blogger.com (ADMIN) — Tue, 13 Sep 2011 10:35:00 +0000

Free Energy For Life? Really?

I understand you may be skeptical of such a thing, and that it is too good to be true, but this is a reality. So how could you utilise the energy from a magnet? A magnet is something that has energy, yet doesn't require energy input. When you try to connect the same polls of a magnet together, you'll feel the force repelling them. This is natural and does not need an energy input to instigate this. Therefore, a magnetic energygenerator takes advantage of these properties.

Did you know that you could completely eliminate your power bill, by constructing a zero point magnetic power generator?

A Zero point magnetic power generator is basically a Free Energy Generator. It uses magnets, and magnetic force to induce perpetual motion. It runs by itself indefinitely without stopping, thus creating completely free electrical energy, which can fully power your home for free. A perpetual motion device refers to a machine that runs perpetually i.e. indefinitely, and produces a larger amount of energy than it consumes. Thus, it produces free energy indefinitely and runs by itself without having to need a third-party device or resource to power it.

The free energy devices have been suppressed by the corporate world because such devices would allow people to create their own energy for free, which would ultimately shut down the big energy corporations.

What are the Benefits of Magniwork?

By constructing the magniwork power generator you will be able to generate completely free electric energy, i.e. creating energy without needing any source of renewable or non-renewable energy. The generator powers itself and creates energy by itself without requiring solar energy, heat, water, coal or any kind of resource. This generator powers itself and works indefinitely without stopping, creating a large amount of energy. Here are some of the benefits that Magniwork has:

1. It works in every home and requires only a small amount of space.

2. You can eliminate your power bill by 50% or even completely, depending on how you implement the magniwork generator.

3. It works in all conditions and can work in extreme hot or cold without any problem.

4. The material needed to build the magniwork generator is cheap and easily accessible anywhere in the world.

5. The process has been simplified and the steps are easy to follow, so even a complete novice would be able to follow them.

6. Magniwork contains a bonus chapter about the backgrounds and history of Magniwork.

Can this device be used to power a household?

The magniwork free power generator can be efficiently used to power your home with almost zero costs on your side. Furthermore, the generator is eco-friendly and doesn't produce any harmful byproducts.

Hundreds of successful magniwork generators have been built around the world, which proves that this technology really works. It is predicted that the technology will rapidly spread, and some industry-insiders even predict that the magniwork free energy generators will be the energy in the future. These experts estimate, that by 2020 energy companies will start implementing this technology in order to create cheaper and more environment friendly energy. Until that time comes, you can use this technology at a very reasonable set-up cost.

Is It Safe?

The magniwork free power generator is safe to use and operate. It doesn't produce any harmful byproducts or gases, and there isn't any hazard concerning the generator itself. Even if you have young children, they may freely walk in the close viccinity of the generator.

The magniwork generator is also a very eco-friendly solution because it doesn't pollute the environment. The generator itself isn't flammable or combustible, so it's completely safe.

How Much Can You Save?

The amount you can save by building the magniwork free energy generator can vary. If you decide to build the generator as a supplement to your current electrical installation, i.e. partially power your household with magniwork, you can easily save anywhere in the range of 30-50%. This means that your power bill will reduce by 30-50%.

If you decide to implement magniwork on a full-scale, it will independently power your household meaning that you won't have to pay anything to the power company. The magnetic free energy generator will work by itself perpetually and generate 100% free electric energy.

Source: http://www.articlesnatch.com

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How An Electric Generator Works

noreply@blogger.com (ADMIN) — Tue, 13 Sep 2011 09:15:00 +0000

Faraday's Law of Induction is the principle under which electric generators work. Every magnet has a field of waves around it. Electric current is generated if this magnetic field is disturbed. The electric current can flow along a closed loop of wire. The magnetic field is disturbed by any form of physical motion or force. So electric current will flow through a circuit of wire is a magnet nearby is disturbed by motion or force. Pieces of ferromagnetic metals such as nickel or steel can be made to vibrate near the magnet and this will keep its magnetic field in flux, with a continuous and consequent flow of electric current in a circuit of wire.

This principle is routinely demonstrated in Physics laboratories of Schools. It can be scaled up for a range of industrial applications. The smallest of the common templates is used in a musical instrument such as an electric guitar.

Larger ones power common hand tools. One can have a set large enough to supply power to an entire house or even a building. Large power plants that supply electricity to factories and entire cities also work on the same principle.

However moving wires over a magnet or a magnet within a coil of wire, on an industrial scale requires tremendous mechanical energy.

This can be provided by a battery that has stored power for electric generators for home use or on a shop floor. Cascading water as in a thermal plant, coal in a hydrocarbon power plant, fossil fuel such as diesel or atomic energy can be used for mechanical energy in large power generating stations and complexes. Energy is always transmitted through a shaft. Power Plants are large and controversial for their impact on the environment and on finite resources. Electric generators produce alternating current because the magnetic field is disturbed in to and fro manner. Though there is no limit in theory to the dimensions of an electric generator and how much electricity it can produce, there are practical limitations. Wire resistance, heat generation and complications of magnetic fields in flux, are the major factors.

A new form of electric generation is through fuel cells. These arouse great interest because of their ability to produce electric power without pollution. Fuel cells may replace other types of electric power generators in many fields soon. A fuel cell produces electricity by combining oxygen and hydrogen to produce water. Oxygen comes from air and hydrogen may be either in pure form of reformed from another substance such as methanol. Batteries may also be considered as fuel cells but they have finite amounts of generating capacity depending upon their chemical store. Hydrogen fuel cells are sustainable as they use electrolytes and need not be discarded. Fuel cells produce direct current. There are many variations of the relatively new fuel cell technology, but they all work on the principle of converting chemical structures in to electricity. Power tools will soon have models based on fuel cell technology.

Power is ubiquitous in our lives and life without electricity is difficult to conceive. Conservation pressures have accelerated innovation in electric generators and cars based on hybrid engines are a very recent result. The technology will soon find its way to consumer devices used in homes, offices, workshops and the like.

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Permanent Magnet Generator - Generate Free Electrical power

noreply@blogger.com (ADMIN) — Tue, 13 Sep 2011 08:03:00 +0000

One of the most amazing new innovations in the field of alternative energy in recent years has been the permanent magnet generator. This machine uses a multitude of magnets to drive a flywheel which, in turn, drives a small generator that produces a relentless stream of electricity. The process is fresh, environmentally friendly and can last almost indefinitely without renewing the power source.

A standard magnet generator can produce roughly 7000 watts of electric power which is equivalent to about 50% of the needs of the average household. Building two of devices means, of course, that you can be completely energy self sufficient for many years to come.

Using the right guide, they're very simple and economical to build. Also, because the process has been hugely simplified, its possible for anyone to build a working model into their home, irrespective of their DIY (Do It Yourself) skills or the tools they have got available.

With electricity prices constantly on your rise, there has never been a better time to start out saving money by generating your own power, and thanks to the advances in the technology there has never been a better time to start generating your own electricity with the aid of a permanent magnet generator.

The concept was first developed about Ten years ago by an Australian electrical engineer, and he has been working on refining the design since. The end result is a machine that anyone can build in a very few hours using cheap, readily available parts, yet amazingly provide for up to 50% of the normal households electricity needs. So, its truly an amazing device but how does a permanent magnetic generator work?

In just about any case, the flywheel turns and is linked with a small turbine - in much the same arrangement as a wind turbine, except with no huge set of blades. This turbine produces electric power which is then stored in a set of batteries for use when required. The final component is an inverter that permits you to hook your magnet generator straight up into the mains and power your household appliances.

This type of generator can operate all day and night. You do need sun for solar electric power and strong wind for wind power, but You do not need anything at all for your generator to work At any hour. You will get more energy from some sort of permanent magnetic power generator than other substitute energy sources.

The magnetic generators for no reason release toxic fumes. The generator can produce around 7, 000 watts of energy. The best thing is the magnet generator can be made at residence. All you need is a manual for building generators in your own home. This manual can be downloaded from most respected websites. All reputed websites provide customer testimonies and feedback. It is a good idea to through all these testimonies before you decide to buy anything new.

source:- Published-Articles.com

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Magnetic Electrical Power Generators – The Shocking Reality

noreply@blogger.com (ADMIN) — Wed, 30 Mar 2011 10:26:00 +0000

Thousands of individuals are exploring for alternate sources of electric powered energy. All people is aware that pv strength and wind turbine utility era present an eco friendly substitute to fossil fuel created electric power. A third substitute for utility creation is magnetic strength era.

Leonardo Da Vinci created some drawings of machines that he believed could be capable of creating no cost energy. Nikola Tesla has been known as the father of free electricity. A lot more lately, Bruce De Palma and John Christie have produced what they call the long term of free of charge power.

In 1977, Bruce De Palma made his N-Device, which he claimed employed rotating magnets to create energy. Overunity or perpetual motion refers to any device or program that perpetually makes much more strength than it consumes.

Australian inventor John Christie of Lutech Australia Pty Ltd, statements to have produced a magnetic energy generator able of 440% overunity. Several of the websites that market the strategy of magnetic power technology provide Do-it-yourself ideas for doing the generator. In addition, this simply made electrical power generator could replace 50% or much more of your electrical utilization. The internet site states that hundreds of these generators have been designed from their ideas and they list numerous satisfied clients. dependent persons claiming to have designed and set up these generators. Regrettably, I was incapable to find any of the references listed on the Magniworks web site.

Incapable to verify any real functioning installation, I made the decision to get a hold of the magnetic generator plans from the Magniworks web site. With these programs I was having to the truth of the matter about magnetic electric power generators. The ideas present comprehensive parts list, illustrations and guidelines. Nonetheless, immediately after constructing the generator you have some thing that is a science project, not an alternative power alternative. The generator is tiny (around 4 inches square) and according to the printed specifications creates only 24.5 watts of output. Consider about that. 24.5 watts is much less than half the electrical power required to light up a single 60 watt light bulb. So what is the shocking fact about magnetic strength generators?

Magnetic electric power generation claims for achieving overunity have not been independently verified. The favorite Magniworks Do-it-yourself generator, even if it performs, is not substantial sufficient to generate a meaningful volume of electricity.

So what is the shocking reality about magnetic power generators? Free power from magnets is nonetheless a theory, not proven concept. Stick with proven choice energy sources. Solar electrical power and wind turbine energy, whilst costing much more that $100 to set up, do in fact generate genuine usable electric power. Outstanding strategies for solar panel and/or wind turbines are offered for you to acquire.

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Generate Free Electrical power

noreply@blogger.com (ADMIN) — Wed, 30 Mar 2011 09:04:00 +0000

Permanent Magnet Generator

The concept was first developed about Ten years ago by an Australian electrical engineer, and he has been working on refining the design since. The end result is a machine that anyone can build in a very few hours using cheap, readily available parts, yet amazingly provide for up to 50% of the normal households electricity needs. So, its truly an amazing device but how does a permanent magnetic generator work?

In just about any case, the flywheel turns and is linked with a small turbine - in much the same arrangement as a wind turbine, except with no huge set of blades. This turbine produces electric power which is then stored in a set of batteries for use when required. The final component is an inverter that permits you to hook your magnet generator straight up into the mains and power your household appliances.

This type of generator can operate all day and night. You do need sun for solar electric power and strong wind for wind power, but You do not need anything at all for your generator to work At any hour. You will get more energy from some sort of permanent magnetic power generator than other substitute energy sources.

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Electrical generator

noreply@blogger.com (ADMIN) — Wed, 02 Mar 2011 11:45:00 +0000

U.S. NRC image of a modern steam turbine generator

In electricity generation, an electric generator is a device that converts mechanical energy to electrical energy. The reverse conversion of electrical energy into mechanical energy is done by a motor; motors and generators have many similarities. A generator forces electrons in the windings to flow through the external electrical circuit. It is somewhat analogous to a water pump, which creates a flow of water but does not create the water inside. The source of mechanical energy may be a reciprocating or turbine steam engine, water falling through a turbine or waterwheel, an internal combustion engine, a wind turbine, a hand crank, compressed air or any other source of mechanical energy.

Early 20th century alternator made inBudapest, Hungary, in the power generating hall of a hydroelectric station

Generator in Zwevegem, West Flanders,Belgium

Historical developments

Before the connection between magnetism and electricity was discovered, electrostatic generators were invented that used electrostatic principles. These generated very high voltages and low currents. They operated by using moving electrically charged belts, plates and disks to carry charge to a high potential electrode. The charge was generated using either of two mechanisms:

§ Electrostatic induction

§ The triboelectric effect, where the contact between two insulators leaves them charged.

Because of their inefficiency and the difficulty of insulating machines producing very high voltages, electrostatic generators had low power ratings and were never used for generation of commercially significant quantities of electric power. The Wimshurst machine and Van de Graaff generator are examples of these machines that have survived.

Jedlik's dynamo

In 1827, Hungarian Anyos Jedlik started experimenting with electromagnetic rotating devices which he called electromagnetic self-rotors. In the prototype of the single-pole electric starter (finished between 1852 and 1854) both the stationary and the revolving parts were electromagnetic. He formulated the concept of the dynamo at least 6 years before Siemens and Wheatstone but didn't patent it as he thought he wasn't the first to realize this. In essence the concept is that instead of permanent magnets, two electromagnets opposite to each other induce the magnetic field around the rotor. It was also the discovery of the principle of self-excitation.

Faraday's disk

Faraday disk, the first electric generator. The horseshoe-shaped magnet (A) created a magnetic field through the disk (D). When the disk was turned this induced an electric current radially outward from the center toward the rim. The current flowed out through the sliding spring contact m, through the external circuit, and back into the center of the disk through the axle.

In the years of 1831–1832, Michael Faraday discovered the operating principle of electromagnetic generators. The principle, later called Faraday's law, is that an electromotive force is generated in an electrical conductor that encircles a varying magnetic flux. He also built the first electromagnetic generator, called the Faraday disk, a type of homopolar generator, using a copper disc rotating between the poles of a horseshoe magnet. It produced a small DC voltage.

This design was inefficient due to self-cancelling counterflows of current in regions not under the influence of the magnetic field. While current was induced directly underneath the magnet, the current would circulate backwards in regions outside the influence of the magnetic field. This counterflow limits the power output to the pickup wires and induces waste heating of the copper disc. Later homopolar generators would solve this problem by using an array of magnets arranged around the disc perimeter to maintain a steady field effect in one current-flow direction.

Another disadvantage was that the output voltage was very low, due to the single current path through the magnetic flux. Experimenters found that using multiple turns of wire in a coil could produce higher more useful voltages. Since the output voltage is proportional to the number of turns, generators could be easily designed to produce any desired voltage by varying the number of turns. Wire windings became a basic feature of all subsequent generator designs.

Dynamo

Dynamos are no longer used for power generation due to the size and complexity of the commutator needed for high power applications. This large belt-driven high-current dynamo produced 310 amperes at 7 volts, or 2,170 watts, when spinning at 1400 RPM.

Dynamo Electric Machine [End View, Partly Section] (U.S. Patent 284,110)

The dynamo was the first electrical generator capable of delivering power for industry. The dynamo uses electromagnetic principles to convert mechanical rotation into a pulsing direct current (DC) through the use of a commutator. The first dynamo was built by Hippolyte Pixii in 1832.

Through a series of accidental discoveries, the dynamo became the source of many later inventions, including the DC electric motor, the AC alternator, the AC synchronous motor, and the rotary converter.

A dynamo machine consists of a stationary structure, which provides a constant magnetic field, and a set of rotating windings which turn within that field. On small machines the constant magnetic field may be provided by one or more permanent magnets; larger machines have the constant magnetic field provided by one or more electromagnets, which are usually called field coils.

Large power generation dynamos are now rarely seen due to the now nearly universal use of alternating current for power distribution and solid state electronic AC to DC power conversion. But before the principles of AC were discovered, very large direct-current dynamos were the only means of power generation and distribution. Now power generation dynamos are mostly a curiosity.

Other rotating electromagnetic generators

Without a commutator, a dynamo becomes an alternator, which is a synchronous singly-fed generator. When used to feed an electric power grid, an alternator must always operate at a constant speed that is precisely synchronized to the electrical frequency of the power grid. A DC generator can operate at any speed within mechanical limits but always outputs a direct current waveform.

Other types of generators, such as the asynchronous or induction singly-fed generator, the doubly-fed generator, or the brushless wound-rotor doubly-fed generator, do not incorporate permanent magnets or field windings (i.e., electromagnets) that establish a constant magnetic field, and as a result, are seeing success in variable speed constant frequency applications, such as wind turbines or other renewable energy technologies.

The full output performance of any generator can be optimized with electronic control but only the doubly-fed generators or the brushless wound-rotor doubly-fed generator incorporate electronic control with power ratings that are substantially less than the power output of the generator under control, which by itself offer cost, reliability and efficiency benefits.

MHD generator

A magneto hydrodynamic generator directly extracts electric power from moving hot gases through a magnetic field, without the use of rotating electromagnetic machinery. MHD generators were originally developed because the output of a plasma MHD generator is a flame, well able to heat the boilers of a steam power plant. The first practical design was the AVCO Mk. 25, developed in 1965. The U.S. government funded substantial development, culminating in a 25 MW demonstration plant in 1987. In the Soviet Union from 1972 until the late 1980s, the MHD plant U 25 was in regular commercial operation on the Moscow power system with a rating of 25 MW, the largest MHD plant rating in the world at that time. MHD generators operated as a topping cycle are currently (2007) less efficient than combined-cycle gas turbines.

Terminology

Rotor from generator at Hoover Dam,United States

The two main parts of a generator or motor can be described in either mechanical or electrical terms:

Mechanical:

§ Rotor: The rotating part of an electrical machine

§ Stator: The stationary part of an electrical machine

Electrical:

§ Armature: The power-producing component of an electrical machine. In a generator, alternator, or dynamo the armature windings generate the electric current. The armature can be on either the rotor or the stator.

§ Field: The magnetic field component of an electrical machine. The magnetic field of the dynamo or alternator can be provided by either electromagnets or permanent magnets mounted on either the rotor or the stator.

Because power transferred into the field circuit is much less than in the armature circuit, AC generators nearly always have the field winding on the rotor and the stator as the armature winding. Only a small amount of field current must be transferred to the moving rotor, using slip rings. Direct current machines (dynamos) require a commutator on the rotating shaft to convert the alternating current produced by the armature to direct current, so the armature winding is on the rotor of the machine.

Excitation

A small early 1900s 75 KVA direct-driven power station AC alternator, with a separate belt-driven exciter generator.

An electric generator or electric motor that uses field coils rather than permanent magnets requires a current to be present in the field coils for the device to be able to work. If the field coils are not powered, the rotor in a generator can spin without producing any usable electrical energy, while the rotor of a motor may not spin at all.

Smaller generators are sometimes self-excited, which means the field coils are powered by the current produced by the generator itself. The field coils are connected in series or parallel with the armature winding. When the generator first starts to turn, the small amount of remanent magnetism present in the iron core provides a magnetic field to get it started, generating a small current in the armature. This flows through the field coils, creating a larger magnetic field which generates a larger armature current. This "bootstrap" process continues until the magnetic field in the core levels off due to saturation and the generator reaches a steady state power output.

Very large power station generators often utilize a separate smaller generator to excite the field coils of the larger. In the event of a severe widespread power outage where islanding of power stations has occurred, the stations may need to perform a black start to excite the fields of their largest generators, in order to restore customer power service.

DC Equivalent circuit

Equivalent circuit of generator and load.
G = generator
V_G=generator open-circuit voltage
R_G=generator internal resistance
V_L=generator on-load voltage
R_L=load resistance

The equivalent circuit of a generator and load is shown in the diagram to the right. The generator's $V G$ and $R G$ parameters can be determined by measuring the winding resistance (corrected to operating temperature), and measuring the open-circuit and loaded voltage for a defined current load.

Vehicle-mounted generators

Early motor vehicles until about the 1960s tended to use DC generators with electromechanical regulators. These have now been replaced by alternators with built-in rectifier circuits, which are less costly and lighter for equivalent output. Automotive alternators power the electrical systems on the vehicle and recharge the battery after starting. Rated output will typically be in the range 50-100 A at 12 V, depending on the designed electrical load within the vehicle. Some cars now have electrically-powered steering assistance and air conditioning, which places a high load on the electrical system. Large commercial vehicles are more likely to use 24 V to give sufficient power at the starter motor to turn over a large diesel engine. Vehicle alternators do not use permanent magnets and are typically only 50-60% efficient over a wide speed range.^[4] Motorcycle alternators often use permanent magnet stators made with rare earth magnets, since they can be made smaller and lighter than other types. See also hybrid vehicle.

Some of the smallest generators commonly found power bicycle lights. These tend to be 0.5 ampere, permanent-magnet alternators supplying 3-6 W at 6 V or 12 V. Being powered by the rider, efficiency is at a premium, so these may incorporate rare-earth magnets and are designed and manufactured with great precision. Nevertheless, the maximum efficiency is only around 80% for the best of these generators—60% is more typical—due in part to the rolling friction at the tyre–generator interface from poor alignment, the small size of the generator, bearing losses and cheap design. The use of permanent magnets means that efficiency falls even further at high speeds because the magnetic field strength cannot be controlled in any way. Hub generators remedy many of these flaws since they are internal to the bicycle hub and do not require an interface between the generator and tyre. Until recently, these generators have been expensive and hard to find. Major bicycle component manufacturers like Shimano and SRAM have only just entered this market. However, significant gains can be expected in future as cycling becomes more mainstream transportation and LED technology allows brighter lighting at the reduced current these generators are capable of providing.

Sailing yachts may use a water or wind powered generator to trickle-charge the batteries. A small propeller, wind turbine or impeller is connected to a low-power alternator and rectifier to supply currents of up to 12 A at typical cruising speeds.

Engine-generator

An engine-generator is the combination of an electrical generator and an engine (prime mover) mounted together to form a single piece of self-contained equipment. The engines used are usually piston engines, but gas turbines can also be used. Many different versions are available - ranging from very small portable petrol powered sets to large turbine installations.

Human powered electrical generators

A generator can also be driven by human muscle power (for instance, in field radio station equipment).

Human powered direct current generators are commercially available, and have been the project of some DIY enthusiasts. Typically operated by means of pedal power, a converted bicycle trainer, or a foot pump, such generators can be practically used to charge batteries, and in some cases are designed with an integral inverter. The average adult could generate about 125-200 watts on a pedal powered generator, but at a power of 200 W, a typical healthy human will reach complete exhaustion and fail to produce any more power after approximately 1.3 hours. Portable radio receivers with a crank are made to reduce battery purchase requirements, see clockwork radio.

Linear electric generator

In the simplest form of linear electric generator, a sliding magnet moves back and forth through a solenoid - a spool of copper wire. Analternating current is induced in the loops of wire by Faraday's law of induction each time the magnet slides through. This type of generator is used in the Faraday flashlight. Larger linear electricity generators are used in wave power schemes.

Tachogenerator

Tachogenerators are frequently used to power tachometers to measure the speeds of electric motors, engines, and the equipment they power. Generators generate voltage roughly proportional to shaft speed. With precise construction and design, generators can be built to produce very precise voltages for certain ranges of shaft speeds.

Source: Wikipedia, the free encyclopedia

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