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The induction motor is similar to the transformer with the exception that its secondary windings are free to rotate.

**Equivalent Circuit**

The induction motor is similar to
the transformer with the exception that its secondary windings are free to
rotate.

Where *E _{R}* is the induced voltage in the rotor and

Now
we can calculate the rotor current as,

Where *E _{R0}* is the induced voltage and

Now as we managed to solve the
induced voltage and different frequency problems, we can combine the stator and
rotor circuits in one equivalent circuit

Where,

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