What is the number of poles of the motor, how is the number of poles divided?
The number of poles of the motor is the number of poles contained in each phase of the motor. The number of poles corresponds to the speed. The speed of the pole is about 3000 rpm, the pole of the pole is 1500 rpm, and the pole of the pole is 750 rpm.
What is the number of poles of the motor
The "pole number" of a three-phase asynchronous motor is the number of magnetic poles that specify the sub-field. The stator windings are connected in different ways to form different pole numbers of the stator magnetic field. The number of poles of the selected motor is determined by the speed required by the load, and the number of poles of the motor directly affects the speed of the motor.
The motor speed = 60f / p is 60 times the motor frequency divided by the motor pole pairs. According to the formula, it is not difficult to see that the more the number of stages, the lower the speed, the less the number of poles, the higher the speed.
Each group of three-phase AC motors generates N and S poles, and the number of poles per phase of each motor is the number of poles. Since the magnetic poles appear in pairs, the motor has 2, 4, 6, and 8 poles. In China, the power frequency is 50 Hz, the 2-pole synchronous speed is 3000r/min, the 4-pole synchronous speed is 1500r/min, the 6-pole synchronous speed is 1000r/min, and the 8-pole synchronous speed is 750r/min. The windings can be formed one after the other to form a loop, that is, the logarithm of the magnetic poles, which are in pairs, and the poles are the meanings of the magnetic poles. When these windings pass current, a magnetic field is generated, and correspondingly there will be magnetic poles. The current of the motor is only related to the voltage and power of the motor.
How is the number of motor poles divided?
The two poles are called high-speed motors, four are medium speed, six are low speed, and eight or more are called ultra low speed.
Two levels 2800-3000 rev / min
Quadrupole 1400-1500 rev / min
Six levels 900-1000 rev / min
Greater than or equal to eight poles is less than 760 rpm.
Magnetic pole identification method
1, look at the speed such as 1430r / min actual synchronous speed is 1500 rpm, by the speed formula: speed = time (60 seconds) & TImes; frequency (50HZ) divided by the number of magnetic poles a pole pair is 2 poles, which can be Calculate 3000 ÷ 1500 = 2 pole pairs, which is a 4-pole motor.
2, look at the model is more direct: for example, the motor model is Y80M-4Y → three-phase asynchronous motor, wherein the product name code of the three-phase asynchronous motor is: YR is a wound-type asynchronous motor; YB is an explosion-proof asynchronous motor; YQ It is a high starting torque asynchronous motor. 80→The height of the base of the base (mm) M→the length of the base block 4→the number of magnetic poles.
3. The asynchronous motor starts with YB, the squirrel cage type is YR, the increased safety type is YA, then the center height and the pole number, such as YR400-45606KV, which is the asynchronous squirrel cage motor with a center height of 400mm and a pole number of 4 poles. , rated power 560KW, rated voltage 6KV
