Difference Between Asynchronous Motor and Synchronous Motor

Difference Between Asynchronous Motor and Synchronous Motor: Asynchronous motor is an AC induction motor. The rotor of an induction motor rotates at a speed less than the synchronous one. Asynchronous motor, stator powered by two or three-phase alternating current, a rotating magnetic field (RMF) is generated.

The relative speed between the rotating magnetic field of the stator and the rotor will cause an induced current in the rotor conductors. The rotor current generates the rotor flux. According to Lenz’s law, the direction of this induced current is such that it will tend to oppose the cause of its generation, that is, the relative speed between the stator and rotor RMF. N Ns

The synchronous motor that runs at a synchronous speed that is, the rotor speed is equal to the stator speed of the motor.
Synchronous motor The stator poles rotate at synchronous speed (Ns) when powered by a three-phase power supply. A direct current source powers the rotor.

During start-up, the rotor must be rotated at a speed close to synchronous. In this case, the rotor poles are magnetically connected to the rotating stator poles, and thus the rotor starts to rotate at a synchronous speed. N = Ns = 120f / P

Difference Between Asynchronous Motor and Synchronous Motor describe details below:

Asynchronous MotorSynchronous Motor
An asynchronous motor is a machine whose rotor speed less than speed synchronization. N <NSA synchronous motor is a machine in which the rotor speed and the stator magnetic field speed are equal. N = NS = 120f / P
The speed of the motor decreases with increasing load.The speed of the motor has constant with increasing load.
Asynchronous motor, slip value is not zero.In a synchronous motor, the slip value is zero.
An AC induction motor is called an asynchronous motor.A Brushless motor, variable resistance motor, and hysteresis motor is a type of synchronous motor.
Asynchronous motor torque is affected by changes in applied voltage.The torque of a synchronous motor is not affected by changes in the applied voltage.
Asynchronous motors are best used at speeds above 600 rpm.Synchronous motors are perfect for low-speed drives below 300 rpm.
The power factor is always less than 1.0The power factor of a synchronous motor can always be adjusted to 1.0.and they are very efficient.
low-efficiency motorsSynchronous motors are very efficient.
They are used in centrifugal pumps and fans, paper and textile mills, and compressors, etc.They are used in power plants, manufacturing industries, etc.

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