> > > I used pulse width modulation in an EV motor controller... > > > > PWM is used in most DC motor variable speed applications. It > seems to be about the only practical way to get low end torque and > high efficiency. I am kind of suprised that some of that stuff has > not gone to AC motors and a varaible frequency drive arrangment in > EVs or am I just unaware of new developments?
The GM EV1 has an AC motor. It takes a much more complicated/expensive control circuit to run an AC motor. We made relays for the EV1, and leased one for the company (i used to work at Kilovac). It was pretty nifty, but way too expensive.
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