8

Three-phase Induction Motors

TOPICS DISCUSSED

  • Basic principle of a three-phase induction motor

  • Constructional details

  • Rotating magnetic field

  • Synchronous speed

  • Slip speed

  • Rotor-equivalent circuit

  • Rotor current

  • Rotor frequency

  • Power-flow diagram

  • Torque

  • Torque-slip characteristics

  • Effect of change of rotor circuit resistance on torque-slip characteristics

  • Starting torque

  • Condition for maximum torque

  • Starting

  • Speed control

  • Losses

  • Efficiency

  • Applications

8.1 Introduction

Three-phase induction motors are used in many industrial applications such as a drive motor. These motors are very rugged, and hence there is virtually no maintenance required. Only three-phase supply is required for the stator. No supply is to be provided to the rotor. ...

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