All You Need To Know About The Permanent Magnet Generator


1.1 A permanent magnet generator is a device that converts mechanical energy to electrical energy.

1.2 The rotor windings have been replaced with permanent magnets. These devices require a separate DC supply for neither excitation circuit nor do they have slip rings and contact brushes.

1.3 These machines are superior alternatives to traditional induction motors that can be coupled with turbines and diesel generators.

1.4 Another major advantage is that these machines do not require any specific work environment and hence can be used in wind and water machines.

1.5 The PMG can be a DC voltage machine without brushes or can be an AC synchronous multiphase machine with any frequency to be generated. This eliminates the excitation losses in the rotor, which otherwise typically represent 20 to 30 percent of the total generator losses. 

1.6 Considering a permanent magnet DC generator, the inductor is found at the stator with an array of permanent magnets. But in the case of an AC generator, the inductor is located at the rotor with an assembly of the permanent magnet.

These devices do not consume any environmental resources to produce energy and thus are environmentally friendly. Besides, no wastage or by-products is generated from these devices in the process of energy generation. Environmental experts recommend the use of permanent magnet generators as these can reduce the impact of pollution by up to 50% percent.

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Our permanent magnet alternator is an eco-friendly electro-mechanical device because of exceedingly less mechanical power consumption and maximized power output. Permanent magnet alternators are more compact as compared to synchronous generators and allow simplified mechanical integration thanks to the fact that they are directly driven by the rotor and therefore, more efficient than the AC asynchronous generator.

The permanent magnet alternator has excessively less weight and length. Our permanent magnet alternator is designed with ultra-superior technology to increase efficiency with a complete power output system.

The permanent magnet alternator is by principle a multiphase AC synchronous machine and more particularly a 3-phase machine delivering a balanced system of AC voltages and currents, in which both stator and rotor magnetic fields are rotating synchronously at the same speed without any slip.


The permanent magnet alternator’s speed is selected depending on the application so that there is no speed variation. With a PMG system, there are several benefits to the more traditional AC systems:

· Smaller compact system

· Higher efficiency

· Speeds other than synchronous can be fixed to optimize engine power, fuel consumption, and voltage output

· High power density reducing weight (both alternator and for the engine)

· Increased reliability of the system by removing traditional excitation windings.


The permanent magnet alternator’s rotor is directly equipped with a wind turbine so that it can generate fixed electrical power. The efficiency of permanent magnet synchronous alternators is way higher than that of asynchronous generators. It offers a variety of merits over asynchronous generators and they are as follows:

· Direct drive (No speed multiplier, no gearbox needed)

· Virtually no maintenance

· Highest power-to-weight ratio in direct drive

· High efficiency

· Simplification of mechanical design

· Easy mechanical interface

· Cost optimization

· They are environmentally friendly and do not rely on the external weather to produce electricity

· They are smaller in size and hence require very less space compared to other types of generators.

· These permanent magnet generators run for years and beyond without any wear and tear. Additionally, they are soundless and noise-free thus making zero sound pollution.


· Low-speed, direct-drive PMGs operate without any gearbox and fast-rotating parts, resulting in increased reliability and superior drive train efficiency.

· Generator can be designed with a segmented stator construction. This provides redundancy and makes it possible to repair the generator in the nacelle without full disassembly. Optionally, our generator design can use the generator bearing as a turbine main bearing to integrate the turbine brake system into the generator construction. Benefits are simplicity, fewer components, and therefore, higher reliability.

· With the rising cost of electricity, an increasing number of populations are looking for an alternate source of energy and permanent magnet generators fit this gap perfectly. These generators can also reduce the strain on the environment as they do not use any non-renewable sources of energy for producing electricity.


Wind turbine and hydro turbine

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