A 4-pole, 3-phase induction motor operates from a supply whose frequency is 60 Hz. calculate: 1- the speed at which the magnetic field of the stator is rotating. 2- the speed of the rotor when the slip is 0.05. 3- the frequency of the rotor currents when the slip is 0.04. 4- the frequency of the rotor currents at standstill.

The answer is below

Explanation:

1) The synchronous speed of an induction motor is the speed of the magnetic field of the stator. It is given by:

2) The speed of the rotor is the motor speed. The slip is given by:

3) The frequency of the rotor is given as:

4) At standstill, the speed of the motor is 0, therefore the slip is 1.

The frequency of the rotor is given as:

answer:

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