At 02:18 PM 12/6/02 -0500, you wrote:
>Does anyone know where I can find information on designing a single
>phase variable frequency drive? I will be using a PIC so this isn't
>entirely off topic. I would be driving a 1/3 hp permanent split
>capacitor motor. Thanks!

Unless your speed range is very limited, you'll actually be
designing a single-phase-input, two phase output drive and dumping the
capacitor. The passive network only has the appropriate phase
shift at a single frequency.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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