A frequency inverter (VFD/AC drive) first converts fixed-frequency mains to DC, then reconstructs three phases at the desired frequency to control motor speed.
Three core blocks
- Rectifier
- AC → DC (diode/active front end)
- DC link
- Filtering + energy buffer (capacitors)
- Inverter stage
- DC → variable-frequency AC (IGBT/PWM)
Most drive faults concentrate in one of these three blocks: rectifier (input), DC link (capacitors) or inverter (IGBT).
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