Permanent Magnet Generator (PMG)

Radial Flux PMG

The radial flux permanent magnet generator is synchronous, where the rotor windings have been replaced with permanent magnets. This eliminates the excitation losses in the rotor, which otherwise typically represents 20 to 30 percent of the total generator losses. This leads to considerable higher part load efficiency for the PMG compared to asynchronous generators.

The high efficiency and multi poled layout of the PMG leads to better utilization of the wind energy and enables gearless power transmission

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Axial Flux PMG

In contrary to a radial flux configuration where the magnetic field is applied radially inward and outward from the rotor, in an axial flux generator, the magnetic field is applied along the rotor axis. The electromagnetic concept in an axial flux generator operates similarly to a radial flux generator, but the lack of an iron core removes the attractive forces between the rotor and stator - the absence of which means lower structural loads and large weight reductions, even as power ratings grow. With lower structural loads and no iron core, axial-flux PMGs can also increase efficiencies, particularly at lower wind speeds.

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