AC synchronous motor is a constant speed drive motor that maintains a constant proportional relationship between rotor speed and power frequency. It is widely used in electronic instruments, modern office equipment, textile machinery, and other fields. Synchronous motors belong to AC motors, and the stator winding is the same as asynchronous motors. Its rotor rotation speed is the same as the speed of the rotating magnetic field generated by the stator winding, so it is called a synchronous motor. Due to this, the current of a synchronous motor is ahead of the voltage in phase, meaning that the synchronous motor is a capacitive load. Therefore, in many cases, synchronous motors are used to improve the power factor of power supply systems
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