Very simplified - Inverter still generates sine wave but watch the shaft rotation to maintain negative slip (generated frequency is lower than rotation). The AC voltage induced in the windings in return become greater than you put in (so after this happens you don't need to put in anything) and the difference is what you harvest (minus efficiency). Inverter switches in "reverse" mode rectifying not entire sine wave but part of each cycle depending on how much extra voltage you demand to produce. It often does it by usual PWM technique so "field" current is just strong enough to generate only as much as you want. Rectified AC charges your batteries.
Victor "Patchem, Eric EM2" wrote: > > How is an AC induction motor (in the case of AC drive) used for > regenenerative braking? I understand how the motor works, but I cannot see > how it would work as a generator. I know the inverter plays a major role in > this, but I cannot see how an induction motor with no field connections, can > produce an output. > > Eric.
