What does the Number of Poles in a Motor Mean? What is the Difference between 2 Poles, 4 Poles and 6 Poles

The "number of poles" of a three-phase asynchronous motor refers to the number of poles in the stator magnetic field of the motor. The stator magnetic field of the motor with different number of poles is due to the different connection method of the stator winding of the motor. We generally choose the number of poles of the motor to be determined by the speed required by the motor load. The speed of the motor is affected by the number of poles of the motor. The formula: motor speed = 60 times the frequency and then divided by the number of motor pole pairs, that is, n =60f/p (where P is the number of motor pole pairs, for example, for a 2-pole motor, p=1=motor pole number/hour 2, instead of the motor's pole number directly being 2). It can be seen that the voltage and power of the motor affect the current of the motor.

The number of pairs of magnetic poles of the motor, that is, the number of motor windings back and forth, can form a loop, generally in pairs, and the poles are the magnetic poles, which means that when these motor windings pass current, a magnetic field is generated, so magnetic poles are generated. Each set of coils of a three-phase asynchronous motor will generate two magnetic poles, N and S. The number of poles of the motor refers to the number of magnetic poles contained in each phase of each motor. And the magnetic poles of the motor appear in pairs, so the motor will have 2, 4, 6, 8... poles.

The number of motor poles is inversely proportional to the synchronous speed. The more the number of motor poles, the lower the speed. The number of poles of the motor corresponds to the synchronous speed, namely:

The synchronous speed of the 2-pole three-phase asynchronous motor is 3000r/min

The synchronous speed of the 4-pole three-phase asynchronous motor is 1500r/min

The synchronous speed of the 6-pole three-phase asynchronous motor is 1000r/min

The synchronous speed of the 8-pole three-phase asynchronous motor is 750r/min

The above motor speed is the synchronous speed. In fact, the actual speed of the three-phase asynchronous motor will be slightly lower than this synchronous speed, which is why it is called "asynchronous" motor. The specific speed of each model is different. For details, please refer to each Motor pole number parameter of the motor manufacturer.