Working principle of induction motor | Induction motor

Working principle of induction motor

Working principle of induction motor

Working principle of induction motor:  An induction motor is an AC electric motor which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. It is commonly used that also call the asynchronous motor because it runs at speed less than its synchronous speed.

There is usually two type of induction motor. Type of induction motor depends upon the input supply.

  1. Single phase induction motor
  2. Three phase induction motor

Single phase induction motor is not self-starting moto where three phase induction motor is a self-starting motor.

Working principle of induction motor

For the rotating of DC motor, we need to give double excitation. In DC motor, we give one supply to the stator and another to the rotor through brush arrangement.

In any case, in an induction motor, we give just a single supply, so it is fascinating to know how an induction motor functions. It is basic, from the name itself we can comprehend that here, the induction motor procedure is included.
When we give the supply to the stator, a magnetic flux produced in the stator due to the flow of current in the coil. Rotor arranged as each coil becomes short-circuited.

In the rotor, flux from the stators cuts the short-circuited coil in the rotor. For the short circuit of rotor coils, “current will start flowing through the coil”__ According to the Faraday’s Law of electromagnetic induction. When current flow through the rotor coil, another flux gets generated in the rotor.

So there are two fluxes-

  1. Stator fluxes
  2. Rotor flux

Rotor flux will be lagging in respect to the stator flux. So that the rotor will feel a torque which will make the rotor to rotate in the direction of the rotating magnetic field.

Read how a transformer work from here

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