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September 08, 2026 - BY Admin

Variable Frequency Drives (VFD): Operating Principles, Motor Tuning & Harmonic Filters

Optimizing Industrial Electric Motor Energy Consumption

Electric motors account for nearly 70% of all electrical energy consumed across industrial manufacturing plants. Running motors at full speed using throttling valves wastes tremendous amounts of power.

How VFDs Control Motor Speed

VFDs modulate electrical frequencies to deliver precise motor speed control and energy savings.

  • Rectifier, DC Bus & Inverter: Converting AC power to DC, then using PWM IGBTs to generate variable AC frequencies.
  • Soft-Starting Benefits: Eliminating high motor starting inrush currents to protect electrical distribution gear.
  • Harmonic Mitigation: Installing line reactors and active filters to stop electrical harmonics from disrupting factory sensors.

Learn motor automation and drive controls in our Industrial Automation Training.

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