The design difference between synchro motor and asynchronous motors
The biggest difference between synchronous motor and asynchronous motor lies in whether their rotor speed is consistent with the stator rotating magnetic field. The rotor speed of the motor is the same as the stator rotating magnetic field, which is called synchronous motor. Otherwise, it is called asynchronous motor.
In addition, the stator winding of synchronous motor and asynchronous motor is the same, the difference lies in the rotor structure of the motor.The rotor of asynchronous motor is the winding of short circuit, generate current by electromagnetic induction.However, the rotor structure of synchronous motor is relatively complex, with DC excitation winding, so an external excitation source is needed to introduce current through the slip ring.Therefore, the structure of synchronous motor is relatively complex, and the cost and maintenance cost are relatively high.
The difference between synchronous motor and asynchronous motor in function and purpose
The speed of the synchronous motor is synchronous with the electromagnetic speed, while the speed of the asynchronous motor is lower than the electromagnetic speed. The speed of the synchronous motor will not change as long as it does not lose step, regardless of the load. The speed of the asynchronous motor will change along with the change of the load.
The synchronous motor has high precision, but the construction is complex, the cost is high, the maintenance is relatively difficult, and the asynchronous motor although the response is slow, but easy to install, use, and the price is cheap.So synchronous motors are not as widely used as asynchronous motors.Synchronous motors are mostly used in large generators, while asynchronous motors are almost used in motor applications.