Is the number of poles of the motor rotor fixed or variable?

The number of rotor poles of 4 pole ac motor [https://cnemotor.com/products/HV/116.html] refers to the number of magnetic poles on the rotor of the motor; The number of rotor poles affects the speed and torque of the motor. For the cage motor, the number of rotor poles is automatically induced according to the number of stator poles. Theoretically, the same cage rotor can deal with the stator of the motor with different poles, that is, the basic performance requirements of the motor can be met through induction matching.

However, starting from the overall performance compliance, when the stator and the rotor groove match is not reasonable, it may lead to motor starting difficulties, starting dead point, and electromagnetic noise and other problems, so in the design of 3 Phase Induction Motor [https://cnemotor.com/products/High/384.html] rotor groove shape and groove number, it is necessary to choose a relatively optimized groove match relationship.

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For the winding rotor, the matching relation between the motor winding and the number of stator poles has been fixed in the design. The rotor of the permanent magnet motor is fixed by the arrangement of the magnetic steel. Once the number of poles of this type of rotor is fixed, it will not change, and it can only match the stator with the same number of poles.

In motor products, the number of stator poles and rotor poles is an important parameter of the motor, the number of stator poles determines the speed of the rotating magnetic field of the motor, and the number of rotor poles must be the same or match with the stator. When the two are different or do not match, the motor fixed rotor magnetic field is not synchronized, and the torque in a fixed direction cannot be generated to drive the equipment.

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