7
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
7.1 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. The ...
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