EE Questions / AnswersMotorsTransformer

Explain the statement that induction motor is fundamentally a Transformer?

The induction motor is fundamentally a transformer in which the stator is the primary and the rotor is short circuited secondary. This is evident; particularly hen the rotor is stationary. The rotor current establishes a flux which opposes and, therefore, tends to weaken the stator flux. This causes more current to flow in the stator winding just as increase in secondary current in a transformer causes a corresponding increase in primary current. Very often the analysis of an induction motor is made on the same lines as the transformer with the modification that short circuited secondary is considering rotating.
Also note that the working principle of both (Transformer and Induction Motor) is same i.e. Faraday law’s of Electromagnetic induction or Mutual induction.

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  1. The armature reaction occurs based on direction of flowing current, so armature reaction not affect induction generator<br />

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