What is the difference between three-phase synchronous motor and three-phase asynchronous motor

1. The rotational speed is different from that of the magnetic field. If the rotation speed of the rotor is the same as that of the stator, it is called synchronous motor. If it is inconsistent, it is called asynchronous motor.

2. The rotor speed is different. When the number of poles is fixed, there is a strict relationship between the speed and frequency of the motor. The rotor speed of the asynchronous motor is always less than that of the synchronous motor.

3. The use scenarios are different. In the use of the scene, synchronous motor is used in the situation of strict speed requirements, the price is also very expensive. Asynchronous motor is widely used in general occasions, and its price is low.

Extended data:

Both synchronous and asynchronous motors are AC power motors, which are powered by a 50 Hz AC power grid. Asynchronous motor is the stator into the alternating current, produce rotating magnetic field, and the rotor is induced to produce magnetic field.

In this way, the two magnetic fields make the rotor rotate with the rotating magnetic field of the stator. The rotor is slower than the stator rotating magnetic field, there is a slip, asynchronous, so it is called asynchronous machine.

However, the stator of synchronous motor is the same as that of asynchronous motor, but its rotor is artificially added with DC to form a constant magnetic field, so the rotor turns to synchronous with the rotating magnetic field of stator, which is called synchronous motor.

In short, there is no DC excitation current on the rotor of the asynchronous motor, but a DC excitation current is added to the rotor of the synchronous motor, so that the rotor speed is consistent with the magnetic field speed generated by the stator and rotor cutting.