Explain the statement that induction motor is fundamentally a transformer?

Ans. The induction motor is fundamentally a transformer in which the stator is the primary and the rotor is a short-circuited secondary. This is evident, particularly when 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 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 considered rotating.