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RE: Re: AC Motor Speed Control

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Posted by Cly on March 7, 2000 01:36:06 UTC

It`s my understanding, Rick, that varying frequency is the preferred method of precision motor speed control, and the `Motor Pros` say it will work for ANY A.C. motor, from 24vac or less to 460vac or above, whether shaded pole, split phase, permanent split capacitor, or 3 phase. If split phase, the centrifugal switch may need to be replaced with a solid state relay ($12) to open the start winding circuit, and there is a lower limit. You can only go so slow, but enough to give some adjustment range. In PSC motors, the cap just charges slower, and there may be a slight `derating` of the motor H.P. It`s by all means preferable to use a motor built for variable frequency drive, but this is a valid option for atm`rs, and I, for one, want to know all my options.

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