What is the differences between permanent magnet generator and alternator?

For all intents and purposes for many the terms are used interchangeably. Alternators as found commonly found in a car can be converted to permanent magnetic function rather than inductive. as there are many types of Pma's or PMG's. All of which produce wild 3 phase AC the is rectified to DC then transformed to AC at 110 volts for usage in a typical renewable energy install.