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

The answer is below

Explanation:

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.

Given that:

number of poles (p) = 4, frequency (f) = 60 Hz

1) The synchronous speed of the motor is the speed at which the magnetic field of the stator is rotating. It is given as:

2) The slip (s) = 0.05

The speed of the motor (n) is the speed of the rotor, it is given as:

3) s = 0.04

The rotor frequency is the product of the supply frequency and slip it is given as:

4) At standstill, the motor speed is zero hence the slip = 1:

The rotor frequency is the product of the supply frequency and slip it is given as:

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