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Variable speed/direction from a 3-phase motor
10:09 PM 3/30/2007 |
A simple challenge then - get the spindle motor running. It's a nice 350W 3-phase motor. Now this is not going to run off a domestic power-supply, as that's only single-phase. The ORAC came with some weird built-in phase convertor, but it looks like a field-generator from a TIE-fighter. Some of the capacitors were bloated as well. A TIE-fighter that was in the Empire Strikes Back, then. And there are strange connectors coming off it - maybe they control the shield polarity/diffusion? Maybe they provide some strange feedback to the antiquated controller? These insecurities made me decide right out to just use an off-the-shelf phase-converter. The one I got is a bit old, but still has all the functionality I need. You can perfectly control both the speed, and the direction of the motor. And it doesn't require any TIE-interface circuitry.
I did need to build a little circuit board to mount the potentiometer dial and start/stop switches on though. In time I'll tidy this up, and eventually move it to PC control as well (a speed controller board from Homann Designs allows the PC to control the potentiometer and direction switch).
For now manual works. Nicely. |
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