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UNIT 3. INDUCTION MOTORS

1 UNIT 3. INDUCTION MOTORS OBJECTIVE The aim of this chapter is to gather knowledge about the following topics of INDUCTION MOTORS . 1. Construction, types and principle of operation of 3-phase INDUCTION MOTORS . 2. Equivalent circuit of 3-phase INDUCTION motor. 3. The performance calculation by means of finding torque, slip and efficiency. 4. Different types of starters like auto-transformer starter, star-delta starter. 5. Various methods of speed control 3-phase INDUCTION motor. 6. Principle of operation of single phase INDUCTION motor.

In a 3-phase induction motor, the three-phase currents ia, ib and ic, each of equal magnitude, but differing in phase by 120°. Each phase current produces a magnetic flux and there is physical 120 °shift between each flux. The total flux in the machine is the sum of the three fluxes. The summation of the three ac fluxes results in a rotating ...

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