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Can I vary the speed of my motor with a variable transformer?

Would you like to... Print this page Email this page Post a comment Subscribe me Add to favorites User Opinions How would you rate this answer? Helpful Not helpful Help us improve. Why was this unhelpful? Thank you for rating this answer. Many motors can use a variable transformer for speed control. Motors that usually can be controlled by varying the motor voltage: Universal Motors Series Wound Motors Torque Motors Shaded Pole Motors Motors that sometimes cannot be varied by changing the motor voltage: Split Phase Motors Permanent Split Capacitor Motors Repulsion Induction Motors Motors with centrifugal switches Motors with fan cooling can sometimes be damaged due to the decreased cooling effect at lower speeds (depending on load). We recommend that the motor manufacturer be queried to determine whether varying the voltage can control your particular motor.

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Related Questions

How can I protect my three phase variable transformer from excessive currents? Why are the valve motor drive (VMD) outputs limited to 120V AC operation? Are there flux-coupling problems with variable transformers mounted closely? Is any kind of calibration required and/or beneficial for a Variac? I have a very old Variac. Which model can be used to replace this variable transformer?

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