Question:
Variable frequency drives (VFDs) are used in ________.
Variable frequency drives (VFDs) are used in ________.
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VFD = Variable Frequency Drive → controls AC motor speed → most often used with induction motors.
Updated On: Jun 24, 2025
- DC motor control
- Induction motor control
- Stepper motor control
- Universal motor control
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The Correct Option is B
Solution and Explanation
Step 1: Understand what VFD is
A Variable Frequency Drive (VFD) controls the speed of an AC motor by varying the frequency and voltage of the power supplied to the motor.
Step 2: Application of VFD
VFDs are primarily used in controlling the speed of:
- 3-phase induction motors in fans, pumps, conveyors, compressors, etc.
Step 3: Why not other options?
- DC motors are controlled by varying voltage, not frequency.
- Stepper motors use pulses, not sinusoidal waveforms.
- Universal motors are typically controlled using phase angle control, not frequency.
Conclusion:
Induction motor control is the correct application of VFD → Option (2) is correct.
A Variable Frequency Drive (VFD) controls the speed of an AC motor by varying the frequency and voltage of the power supplied to the motor.
Step 2: Application of VFD
VFDs are primarily used in controlling the speed of:
- 3-phase induction motors in fans, pumps, conveyors, compressors, etc.
Step 3: Why not other options?
- DC motors are controlled by varying voltage, not frequency.
- Stepper motors use pulses, not sinusoidal waveforms.
- Universal motors are typically controlled using phase angle control, not frequency.
Conclusion:
Induction motor control is the correct application of VFD → Option (2) is correct.
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