Motor controlsQuestion 189 of 1506

What do the letters VFD stand for in motor control?

  1. Voltage fault detector
  2. Variable frequency drive
  3. Variable field disconnect
  4. Vector flux driver
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Correct answer: Variable frequency drive

Motor drives are sometimes called variable frequency drives, and they control the speed of an AC induction motor.

Source: Troubleshooting Motors and Controls (Dickson-Self), 8.1: Motor Drives

Practice motor controls

Questions last reviewed: 18 October 2026