Motors and Drives: Variable Frequency Drive (VFD)--Sizing Considerations

Part 4 of the Variable Frequency Drive Series details sizing considerations for variable frequency drive systems.

Sizing

  • Supply requirements

    • 115, 230 single phase, 230 3 three phase, 460, 575

  • Types of Loads

    • Constant Torque

    • Constant Horsepower

    • Variable Torque

    • Impact – DERATING DRIVE, current sensing resolutions (hall effect sensor)

  • Torque Requirements

    • Determining your needs

    • FLA on the motor name plate

  • Location/Elevation

    • Higher Elevations require derating for cooling

  • System Dynamics

    • Duty cycle, speed, acceleration, deceleration, dynamic braking

    • May affect motor type (i.e. slow speeds = vector duty)


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