Synchronous motor and asynchronous motor biggest difference is that their rotor speed and stator rotating magnetic field is consistent, motor rotor speed and stator rotating magnetic field the same, called synchronous motor, on the contrary, it is called asynchronous motor.
In addition, synchronous motor and asynchronous motor stator winding is the same, the difference is that the rotor structure of the motor. The rotor of the induction motor is short circuited winding, and the current is produced by electromagnetic induction. The rotor structure of synchronous motor is relatively complex, there are DC excitation winding, so the external excitation power supply is needed, and the current is introduced 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 reactive power
Compared with the asynchronous motor can only absorb reactive power, synchronous motor can send reactive power, can also absorb reactive power!
The difference between synchronous motor and asynchronous motor in function and use
Synchronous motor speed and electromagnetic speed synchronization, and asynchronous motor speed is lower than the electromagnetic speed, synchronous motor regardless of the size of the load, as long as it does not step, the speed will not change, the speed of asynchronous motor with the change of the load size changes.
Synchronous motor has the advantages of high precision, complex manufacturing, high cost, and relatively difficult maintenance, but the induction motor is easy to install and use, and the price is cheap, although it is slow to respond. So synchronous motor has no asynchronous motor widely used.
Synchronous motors are mostly used in large generators, while asynchronous motors are almost used in motors.