A VFD is used to control which type of motors?

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Prepare for the IEC Year 4 Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

A VFD is used to control which type of motors?

Explanation:
VFDs control motor speed by varying the frequency (and corresponding voltage) of the AC supply to the motor. This method works best with AC motors, and most VFDs are designed to output three-phase power. Because three-phase induction motors are the standard in industry and respond well to smooth, adjustable torque and speed from a VFD, the typical use is to drive three-phase motors. Some VFDs can handle single-phase input or drive small single-phase motors, but that’s not the common or ideal application for most VFDs.

VFDs control motor speed by varying the frequency (and corresponding voltage) of the AC supply to the motor. This method works best with AC motors, and most VFDs are designed to output three-phase power. Because three-phase induction motors are the standard in industry and respond well to smooth, adjustable torque and speed from a VFD, the typical use is to drive three-phase motors. Some VFDs can handle single-phase input or drive small single-phase motors, but that’s not the common or ideal application for most VFDs.

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