A frequency changer may be used to vary the speed of AC squirrel cage induction motors.

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A frequency changer (also known as a variable frequency drive or VFD) can be used to manipulate the frequency (and therefore the speed) of AC induction motors, including squirrel cage induction motors. A frequency changer, also called a variable frequency drive or VFD, can be used to vary the frequency of the AC power supplied to a motor, which in turn changes the motor's speed. This is commonly used with squirrel cage induction motors to allow for variable speed control.

A Frequency Changer May Be Used to Vary the Speed