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The difference between synchronous motor and and induction motor
2020/06/17

Permanent magnet synchronous motor, and induction motor (that is, induction motor) is a common ac motor.The permanent magnet synchronous motor is the heart of the power system. It is a component integrating rotation and static, electromagnetic change and mechanical movement to realize the transformation of electrical energy and mechanical energy. Its dynamic performance is very complex, and its dynamic performance has a great impact on the dynamic performance of the whole power system.


The characteristics of permanent magnet synchronous motor are as follows: in steady-state operation, there is a constant relationship between the rotor speed and the power grid frequency n= NS =60f/ P, where F is the power grid frequency, P is the polar logarithm of the motor, and NS is called the synchronous speed.If the frequency of the power network is constant, the speed of the synchronous motor is constant in steady-state and has nothing to do with the load.


Asynchronous motor, also known as induction motor, is a kind of ac motor in which the electromagnetic torque is generated by the interaction between the air gap rotating magnetic field and the rotor winding induction current, so as to realize the conversion of electromechanical energy into mechanical energy.According to the rotor structure, asynchronous motor is divided into two forms: squirrel cage (squirrel cage asynchronous motor), wound asynchronous motor.


1. The difference between synchronous motor and asynchronous motor design

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.


2. The difference between synchronous motor and asynchronous motor in reactive power


Compared to asynchronous motor can only absorb reactive, synchronous motor can send reactive, can also absorb reactive!


3. Funtions and applications of synchronous motor and asynchronous motor


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. Synchronous motors are mostly used in large generators, while asynchronous motors are almost used in motor applications.


Asynchronous motor, also known as induction motor, is a kind of ac motor in which the electromagnetic torque is generated by the interaction between the air gap rotating magnetic field and the rotor winding induction current, so as to realize the conversion of electromechanical energy into mechanical energy.According to the rotor structure, asynchronous motor is divided into two forms: squirrel cage (squirrel cage asynchronous motor), wound asynchronous motor.


JIUYUAN has advantage on micro AC synchronous motor, especially high temperature 200°C synchronous motor and high voltage 400v 50K synchronous motor. Our micro AC synchronous motors include oven synchronous motor, 220V/120V microwave synchronous motor, turntable synchronous motor, AC 100~120v synchronous motor, AC 220v~240v synchronous motor, synchronous motor for mechanical door lock ,2rpm~50rpm 50/60Hz synchronous motor , home appliance synchronous motor etc. The insulation class of small AC synchronous motor is class E, class F, class H, class N.

We insist on technological innovation and assure the reliable performance of motor.


JIUYUAN own TUV, UL, 3C certificate for mini AC synchronous motor.


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