speed control of induction motor using dimmer
speed control of induction motor using dimmer


Induction motor speed control is done by varying the frequency of the applied voltage. Raising or lowering the voltage can have some speed control effects but these will be small, difficult to control, load-dependent, possibly cause the motor to overheat and, are not generally recommended.

This applies to three phase induction motors and single phase induction motors using a start/run capacitor.

People use VFDs to control induction motor speed but even these are not particularly helpful (a generalism of course) with single phase induction motors that use a capacitor.