Number of Poles in a Motor

Let N s1 frequency of motor A N s2 frequency of motor B P 1 number of poles stator of motor A P 2 number of stator poles of motor B N speed of the set and same for both motors f frequency of the supply Now slip of motor A S 1 N s1 - N N s1. Speed 120 x frequency Hz poles of the motor.

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Motor A is called the main motor and motor B is called the auxiliary motor.

. Example 120 x 60 hertz 4 poles 1800 rpm. In the case of constant output power the more pole pairs of the motor the lower the motor speed but the greater the torque. The eight pole motor has eight magnetic poles that is the motor has four pairs of magnetic poles.

For a four pole machine 60 x 50 2 1500 rpm so the same size motor at 55kW 400v but 4 poles will have a nominal speed of 1500rpm but will run near 1455 rpm. Similarly if the windings are arranged according to certain rules 3 pairs of poles and 4 pairs of poles can be obtained. When selecting a three phase motor the number of poles is chosen to.

Keep in mind that the speed of an AC motor will not run at these exact numbersand will be slightly lowerbecause there is a certain amount of slip that must be present for the motor to produce torque.

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