Do you know what type your single phase motor is? - capacitor start* or capacitor run? I believe running the former of a VFD can be a minefield presumably since the centrifugal switch that disconnects the starting capacitor won't necessarily work if the motor's running at a lower speed than normal. I might get one for my buffing machine which runs badly with a triac speed controller i'm using and the torque really drops off at lower speeds whe pushed hard.ĪndrewI'm not suprised at that really, since to lower the speed of an AC induction motor, you obviously need to drop the frequency of the supply, not just drop the voltage, which is essentially what a triac controller does.
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