On 15 Sep 97 at 19:41, Pierce Nichols 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.

Was going to ask if you were going 3 phase.  You playing with
frequency a lot too?  There MUST be a reason aircraft systems run at
400Hz - one suspects weight is one of the factors, and that would
certainly help anything solar...
MikeS
<mikesmith_oz@nosp*m.relaymail.net>
(remove the you know what before replying)