Induction Motor definition and working principles

Working of the Induction Motor

In the induction motor, the starter winding is fed with the Alternating current supply. The Ac supply produces the alternating flux around the stator winding and revolves with a relative speed. This revolving flux is known as the Rotating Magnetic Flux.

According to the Faradays Law of electromagnetic induction, the stator RMF and the rotor conductors induces the electromagnetic flux in the rotor conductor. This produces the rotor current with the help of induced EMF. It is due to this reason we call such motors as induction motors.

The current in the rotor produces the alternating flux around it. But the rotor flux leaves behind the stator flux. As per the Lenz’s Law, the direction of the rotor current opposes the cause of its production. Being the cause of the production, the relative velocity between the stator and rotor flux, the rotor tends to match with the stator RMF.

Therefore, the rotor rotates in the same direction in the same way same f the stator flux to reduce the relative velocity. But the rotor never catches up the relative speed. This is the basic working of the induction motor, whether it’s a single phase or 3 phase induction motor.

Characteristics of Induction Motor

  • It is a self-starting motor. Does not require any starting device
  • The construction of the induction motor is robust in nature.
  • It is very economical and affordable.
  • This motor is easy in maintenance and has fewer repair costs.





  1. Ravi November 7, 2017
  2. Josph pardeep kumar November 18, 2017

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