A PM generator will require some type of controller to charge a battery pack. The voltage will vary directly with rpm complicating its use for regen braking.
PM motors also tend to have rather high losses in no load operation because of the cogging caused by the permanent magnets attracting the iron in the poles.
PM motors also tend to have rather high losses in no load operation because of the cogging caused by the permanent magnets attracting the iron in the poles.