Permanent magnet generator is a device used to convert mechanical energy to electrical with highest efficiency. In conventional alternator the rotor is made of amination and the copper wire is wounded to rotor to generate magnetic field. On rotation the rotor cut the magnetic field, flux is cut and emf is induced to generate alternating current.
It is used as an exciter in alternators, like a 5 megawatts generator will be using approx. 5 kw of exciter (PMG) which will provide dc voltage to the field of alternator, consequently size and fuel consumption gets reduced from the usage of a PMG in big sized alternators.
The Ambient temperature of exciter is normally 80 degree so the high temperature magnets are being used for the rotor of pmg – Alnico having temperature range of 350degrees
It has IP protection 55 standard foot mounted.
A Permanent magnet alternator as also be used in wind turbines which rotates at lower RPM and are directly coupled with the same approx. 300 RPM having 20 poles or can be varied depending upon the requirement . Unlike the conventional having gearbox between them to eliminate the losses and producing highest efficiency.
It can also be used in generating power with the help of hydro turbine, with the flow of water the turbine gets rotated, or can be water falling from the higher heads to the turbines the potential energy of water gets converted to kinetic energy to the turbine so, as it is directly coupled with the pmg. So on rotation the electricity is produced with the permanent magnet alternator.
It has a wider scope where the dams of big water falls are situated, for example Nigra falls in Canada
It can be used to generate free energy, efficiency above unity if coupled with a bldc motor with the help if flywheel. With the intervention of an engineer the person can achieve the result of above unity.
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Traditional generators need to revolve at 1800 revolutions per minute to generate power. This requires a great expenditure of energy to produce a feasible amount of power. With low RPM generators, there is the advantage of power production at low revolutions per minute. The low RPM generator starts producing power at a single RPM. There are several advantages associated with a low RPM generator in terms of performance, reliability and life of the equipment. The low rpm permanent magnet generator uses powerful neodymium magnets that create a permanent magnetic field around the conducting coils.
The speed at which the rotor blades rotate is typically much lower than the speed required to generate electricity with a standard generator, which is why a low RPM generator is needed. The low RPM generator is designed with a larger number of turns in its wire coils, so that it can generate a usable amount of electricity even at low rotational speeds. In addition, Innotec’s units will also have a higher number of poles than a traditional alternator. Increasing the number of poles allows cleaner conversion of the electricity generated. Generating power with a 4 pole machine at 150 rpm would be very difficult to utilize. Instead Innotec’s low rpm generator use 10+ poles.
Low RPM generators are an important component of small wind turbines because they allow for efficient and effective conversion of wind energy into electrical energy. They are typically more reliable and durable than high RPM generators because they operate at lower speeds and generate less heat and mechanical stress.
In summary, low RPM generators are an essential part of small wind turbines, as they enable the efficient and reliable conversion of wind energy into electrical energy at low rotational speeds.
Low cost: These generators not only provide higher efficiency than traditional alternators but they also have low cost structures reducing upfront capital costs. The lower weight compared to DC generators reduces the cost of materials.
Low maintenance: The permanent magnet generators don’t require extensive maintenance as these are designed to operate in an optimum manner. The neodymium magnets used in these generators have a high working temperature which ensures that these magnets will not demagnetize very soon and continue to provide services for a long time to come.
Reliable Power Output: The permanent magnet generators are a highly reliable source of power as they work at low speeds which leads to less wear and tear of various parts of the generators. As there are no slip rings used in these generators, these are simple to maintain and ideal for power production for a longer duration of time.
Simple Design: These generators have a simple design which makes it easy to produce them and also helps in proper maintenance and repairs in future.
Different Sizes: These generators are available in different sizes and capacities that allow users to choose one that meets their requirements and budget. Whether a permanent magnet generator is coupled with a wind turbine for a small business facility or for power needs of a small house, these generators are perfect for all applications.
The low RPM generators once deployed can provide years of usage. The low cost of these generators makes them an ideal choice for customers who are looking for a reliable power source at an affordable price. One can find out more about these generators from various sources on the internet and can also use the services of manufacturers who will build a custom permanent magnet generator as per own specifications.
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