Electrical

Inside a Variable Frequency Drive (VFD)

Electrical Diagrams · made in Skemio

VFD architecture showing 3-phase AC input, diode rectifier, DC link capacitor, IGBT inverter, and variable output to an induction motor.
VFD architecture showing 3-phase AC input, diode rectifier, DC link capacitor, IGBT inverter, and variable output to an induction motor.
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What it shows

  • 6-pulse diode bridges rectify 3-phase AC into pulsating DC voltage.
  • DC link capacitors and inductors smooth ripple and buffer transient spikes.
  • IGBT inverters use high-speed PWM to synthesize adjustable frequency AC.

The takeaway

VFDs decouple input and output frequency through a DC intermediate link, enabling precise motor torque.

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