A motor with two operating speeds.Two-speed motorBelong toThree-phase asynchronous motorPole change speed regulation is to change the pole number of the stator rotating magnetic field by changing the connection method of the stator winding, so as to change the speed of the motor.
We knowThree-phase asynchronous motorThe synchronous speed is inversely proportional to the number of magnetic poles, which can be expressed by the formulan=60f/pFrom this formula we can see that the number of magnetic poles is doubled and the speed is synchronizednDrop to half of the original speed, rated motor speednIt will also drop by nearly half, so changing the number of magnetic poles can achieve the purpose of changing the motor speed, this method belongs to the pole, can not smooth speed regulation, only applicable to squirrel cage motor.
two-speedThree-phase asynchronous motorThe variable speed is changed by changing the connection mode of the winding, that is, by changing the number of magnetic poles of the rotating magnetic field of the motor to change its speed. Low normal speed,Sometimes high-speed rotation, mainly through the following external control line switching to change the winding connection of the motor coil to achieve.
1Two common windings with different pole numbers are embedded in the stator slot, and the number of magnetic poles is changed by changing the connection of the stator windings of the motor through the switching of the external control line;
2Two independent windings with different pole numbers are embedded in the stator slots;
3Two independent windings with different pole numbers are embedded in the stator slot, and each winding can have a different connection.
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