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Old 06-29-2018, 04:00 PM   #21
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Originally Posted by Flyingsod View Post
You know you need a special motor to make it work with a rheostat? You cant just throw it on a standard motor. In any case wed Linda need to know if its single or 3 phase to offer any suggestions.

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Old 06-29-2018, 06:36 PM   #22
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I believe that’s a Dinky controller for a DC crane DMX.
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Old 06-29-2018, 10:32 PM   #23
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A simple rheostat won't work on an AC induction motor. If the voltage is reduced and the HZ stays the same, the current will go up. And up And up even the point of burning something up, usually the motor.

If the voltage and HZ are reduced in proportion (so the Volts/HZ ratio stays close) it'll be just fine at the slower speed. A VFD has the ability to change both V and HZ, a rheostat does not.
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