In a VFD, which component converts DC voltage back into AC to drive the motor?

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Study for the Independent Electrical Contractors (IEC) Year 4 Test. Use flashcards and multiple-choice questions, each with hints and explanations. Prepare effectively for your exam!

Multiple Choice

In a VFD, which component converts DC voltage back into AC to drive the motor?

Explanation:
The motor in a VFD is powered by the inverter stage, which takes the DC from the DC bus and turns it back into AC. The inverter uses fast-switching devices arranged in a three‑phase bridge and employs PWM to synthesize a controllable AC waveform with the desired frequency and voltage. This lets you adjust motor speed and torque. The rectifier (diode bridge) converts incoming AC to DC, and capacitors smooth that DC, but they don’t create the motor‑driving AC—the inverter does.

The motor in a VFD is powered by the inverter stage, which takes the DC from the DC bus and turns it back into AC. The inverter uses fast-switching devices arranged in a three‑phase bridge and employs PWM to synthesize a controllable AC waveform with the desired frequency and voltage. This lets you adjust motor speed and torque. The rectifier (diode bridge) converts incoming AC to DC, and capacitors smooth that DC, but they don’t create the motor‑driving AC—the inverter does.

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