Motors and Drives: Variable Frequency Drive (VFD)--How They Work

Part 2 of the Variable Frequency Drive Series explains how variable frequency drives work.

How they work

  • Rectifier

  • DC Bus

  • Control Card

  • Power Stage/PWM

Compatible Motors

  • General purpose

    • lower constant torque speed ranges (5:1, 2:1)

    • NEMA – Class F insulation grade (Ironhorse brand)

    • NEAM Design A or B

  • Inventor/Vector Duty

    • higher constant torque speed ranges (2000:1, 1000:1)

    • NEMA – Class F, H insulation grade standard

    • NEMA Design A typical

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