The difference between three-phase AC synchronous motor and three-phase AC asynchronous motor
Synchronous machines are mostly used in large generators, while induction motors are almost exclusively used in motorsSynchronous motor can be flexibly adjusted by excitation power factor; power factor of asynchronous motor is not adjustable, so in some large factories, induction motor is applied more, can add a synchronous motor with adjustable camera, used to regulate power factor and power factory interface. However, due to the synchronous motor with high cost and maintenance workload now, generally by the capacitance compensation of the power factor.Because synchronous machine excitation winding and slip rings, the operator needs to have a higher level of excitation control, in addition, maintenance free and asynchronous machine, maintenance workload is bigger; so, as a motor, now mostly choose the asynchronous motor.
The stator windings of synchronous machines and induction motors are the same. The main difference is the structure of the rotorThere is a DC exciting winding on the rotor of synchronous motor, so the external excitation power supply is needed, and the current is introduced through the slip ring;The rotor of the induction motor is short circuited winding, which generates current by electromagnetic inductionAsynchronous motor has the advantages of simple, low cost, easy to install, use and maintenance. It is widely used. The disadvantages of low efficiency, low power factor of power grid and high efficiency disadvantage. Synchronous motor is a capacitive load, can improve the power factor. With large mining equipment.
Asynchronous motor is stator into alternating current, to produce a rotating magnetic field, and the rotor is produced by induction and magnetic field, so that the two magnetic field, so that the rotor rotates the rotating magnetic field of stator and rotor. The stator rotating magnetic field than a slow slip, not synchronous so called asynchronous machine.The rotor of a synchronous motor is a constant magnetic field which is added by the man to the direct current, so that the rotor is synchronized with the rotating magnetic field of the stator, and then the synchronous motor is called synchronous motorStructure and principle
