Secondary motor: 1 opposite pole (2 poles): synchronous speed is 3000 rpm and asynchronous speed is about 2880 rpm.
Quadrupole motor: 2 pairs of poles (4 poles): synchronous speed 1500 rpm, asynchronous speed 1450 rpm or so.
Second, the power is different:
The more pole pairs, the lower the speed and the larger the volume, but the greater the output torque.
The fewer pole pairs, the higher the speed, the smaller the volume, but the smaller the output torque.
Third, the principle is different:
The magnetic field produced by each magnet has a north pole and a south pole, and the same sex repels and the opposite sex attracts. N pole and S pole form a pair of magnetic poles, and the arrangement of motor windings can be arranged into several pairs of magnetic poles. The more poles, the slower the motor speed.
The proper name of the magnetic pole "two-stage rolling and four-stage rolling" is the pole logarithm of the motor. For example, four-stage rolling means that the motor has four pairs of poles, that is, the number of pole pairs is 4, which is called a four-pole motor.
4. For example: length 5 15, width 280 and height 3 15.
Y series motors, rated voltage 380V, rated frequency 50Hz, "Y" connection for 3kW and below, and "△" connection for 4kW and above.
Y225m-2 motor and yx3-225m-2, whose 225 is the same as the center height.
Model meaning Y2-355m2-6: "Y2" indicates the second modified design of asynchronous motor, "355" indicates the center height, "M" indicates the number of frame lengths, "2" indicates the number of iron cores and "6" indicates the number of poles.
Extended data:
If the frequency of three-phase alternating current is 50Hz, the synchronous speed of the synthetic magnetic field is 50r/s, that is, 3000r/min. If the rotating magnetic field of the motor is more than one pair of poles, the synchronous speed n can be further analyzed.
Relationship with logarithm p of magnetic field pole: n=60f/p.f is frequency, and the unit is Hz.n is r/min.
Ns is strictly related to the frequency (f) of the connected alternating current and the number of poles (p) of the motor.
Ns=f/P, in China, the power frequency is 50HZ, so the synchronous speed of two-pole motor is 3000rpm, that of four-pole motor is 1500rpm, and so on. The rotor speed of asynchronous motor is always lower or higher than the speed of its rotating magnetic field, so it is named asynchronous. The difference between the rotor speed of asynchronous motor and the rotating magnetic field speed (called slip ratio) is usually within 10%. Therefore, the speed of AC motor (synchronous or asynchronous) is limited by the frequency of power supply.
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