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Title: Does anyone know a design for a single-phase induction motor controller? Post by: Magnox on December 25, 2010, 08:40:43 20:40 I have a belt grinder that I use for knife sharpening/making that has a single phase 600W induction motor. It would be very useful to control the speed but the only off-the-shelf controllers I can find are all three-phase. Likewise, all the circuits I find are aimed at three phase control.
I understand the principles of designing a single-phase controller for it, but wondered if anyone knows of an existing circuit for this? I don't want to reinvent the wheel, and probably end up with an oval one that needs tweaking. Thanks, Rick. Title: Re: Does anyone know a design for a single-phase induction motor controller? Post by: mris99 on December 27, 2010, 08:04:51 20:04 Hello,
Check this: http://www.circuitcellar.com/microchip2007/winners/first.html It was the winner of the dsPIC design contest 2007 of Circuit Cellar. Summay: Variable Speed Induction Motor Controller Variable-speed drives for AC induction motors are readily available on the market. But what if you need one for a single-phase motor that operates in the 2-HP range? This innovative controller is the solution. Designed for use with a capacitor-start/capacitor-run motor, it includes active power factor correction (PFC) and inrush current limiting. The motor drive hardware is built around a dsPIC30F2020 DSC. The drive communicates via an optoisolated serial port to a PIC16F687-based interface unit. Regards, Mris |