Sinewaves. Oh. AC motors. Forget what I said, then. Three half-bridges.
High-side drivers.

Actually, don't forget what I said about conduction losses. At 36 volts, an
AC system may prove to be less efficient than a plain old DC motor and
Curtis controller. I designed the 1000-amp controller for an entrant in the
1994 SEER competition. At 1000 amps, you go to almost any lengths to reduce
conduction loss, or you burn up and die.

Cheerful regards,

Bob

At 07:41 PM 9/15/97 -0400, you wrote:
>
>> Please explain why you want to make your own speed controller instead of
>> using something like a Curtis PMC?
>
>        Because there is a concept, called a magic sinewave, that allows
>us to get very low distortion power sinewaves (3-phase, too), but it is
>new enough not be in any commercial products. We have a DAC PWM DC speed
>control now. We think we can build a very good magic sinewave inverter
>with these magic sinewaves and get better efficiency and lower motor
>weight.

http://www.bobblick.com/