Why an induction motor is considered similar to a transformer?

The Induction motor is similar as a Transformer with a rotating short-circuited secondary. The stator winding in induction motor corresponds to the primary winding in the transformer and the rotor winding in induction motor corresponds to the secondary winding in the transformer.

What is the difference between transformer and induction motor equivalent circuit?

A transformer transfers electrical power from one circuit to another without changing the supply frequency, i.e. it only step-up or step-down the level of voltage and current, whereas induction motor converts electrical power into mechanical power.

Why the induction motor is called rotating transformer write the methods of speed control of induction motor?

The relative speed between stator RMF and rotor conductors causes an induced emf in the rotor conductors, according to the Faraday’s law of electromagnetic induction. (This action is same as that occurs in transformers, hence induction motors can be called as rotating transformers.)

Why induction motor draws more current than a transformer under no load?

As the air gap between the stator field winding and rotor winding is large, the more magnetizing current is needed to create flux which will cut the rotor conductor. So it is an important reason why Induction Motor draws more No Load Current than a transformer.

Can we use induction motor as a transformer?

The induction motor can be regarded as the transformer. The normal transformer has no air gap as against this an induction motor has distinct air gap between its stator and rotor. In an alternating flux transformer the frequency of induced e.m.f. and current in primary and secondary is always same.

Can an induction machine be used as a transformer?

The induction motor can be regarded as the transformer. The difference is that the normal transformer is an alternating flux transformer while induction motor is rotating flux transformer. The normal transformer has no air gap as against this an induction motor has distinct air gap between its stator and rotor.

Which can be called as rotating transformer *?

Thus an induction motor can be treated as a rotating transformer i.e. one in which primary winding is stationary but the secondary is free to rotate.

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