Motors and Drives: AC Induction Motor--Name Plate

Part 6 of the Motors and Drives Series explains name plate information, which should appear on all motors.

Nameplate Ratings

  • Frame – (NEMA, IEC)

    • Rolled Steel, Cast Iron

  • (Base)Voltage

    • Single voltage, dual voltage

    • Single phase, three phase

  • Current

  • HP

  • Efficiency – small ~80% - larger 90+ %

  • (Base)Speed

    • Number of poles

  • Torque

  • Enclosure (typical)

    • TEFC – cooling varies with speed

    • TEBC – cooling constant regardless of speed

    • TENV – cooling by convention

    • TEWC – cooling constant regardless of speed

    • Mounting (CFace, foot, vertical)

    • Torque Curve - NEMA Design A and B, C, D, F

  • Types

    • General Purpose

    • Inverter Duty

    • Vector Duty

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