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Here's a few articles I've found very helpful from Microchip:

An Introduction to AC Induction Motor Control Using the dsPIC30F / dsPIC33F DSC http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1824&appnote=en023136

AC Induction Motor Fundamentals http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1824&appnote=en012135

Sensorless Field Oriented Control (FOC) of an AC Induction Motor (ACIM) http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1824&appnote=en533872

Sensorless Field Oriented Control (FOC) of an AC Induction Motor (ACIM) Using Field Weakening http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1824&appnote=en536065

Using the dsPIC30F / dsPIC33F for Vector Control of an ACIM http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1824&appnote=en019806

dsPIC30F4012 http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en010338

A couple of years ago I started on a design for an EV induction motor controller. I've learned a lot since then! Its not complete and I'm probably going to rip it up in favour of a surface mount design. It incorporates the micro, gate drive, voltage and current measurement, CAN interface and QE sensor input, if needed.

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