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.
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