These PMG's don't require a gearbox since they are directly coupled to the turbine and are have been designed to produce a high power output at very low RPM.
A permanent magnet alternator (also called PMA, permanent magnet generator, PMG or magneto) relies on the magnetic field generated by a permanent magnet to convert mechanical energy into electrical power. It can generate AC current, with which it can power the whole engine and charge the battery. In this article we will focus on the typical structure of a permanent magnet structure and also give a brief introduction to its working principle. A modern alternator contains both moving and stationary coils of wire. In the alternator, however, the moving coil, called the rotor, uses current supplied through slip rings to generate a moving field. Power is extracted from the stationary field coils.
There are two topology types which are axial and radial flux in designing permanent magnet generators. In an axial flux machine, if magnetic flux linkages run through to axial direction, maximum power density can be obtained. But manufacturing such structured machines is more expensive and several difficulties can be seen particularly over lamination of stators. When comparing these two types of machine structures, it is seen that radial flux structured machines are available more commercial due to it could be manufactured easier than axial flux structured machine at current conditions. Though axial flux structured machines are being preferred for limited industrial applications.
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