We know that the three-phase asynchronous motor has slip rate, the rotor speed is smaller than that of the stator rotating magnetic field; The speed of the motor and the frequency of the power supply, the number of poles is directly related to the synchronous motor, whether in the no-load or load state, its speed is consistent with the rotating magnetic field speed.

       In a no-load stateThree-phase asynchronous motorThe operation is very easy and the current is small; However, when the motor is overloaded, the speed will decrease significantly, and the speed under the load state of the asynchronous motor is smaller than the no-load state.

       Theoretically, the output power of the motor is determined by the load. When the current is small, the output of the motor is also small. However, when the load increases, the resistance moment increases, causing the speed to decrease, the speed difference between the rotor and the rotating magnetic field to become larger, causing the input current to become larger, and the motor power to rise. On the contrary, when the load is reduced, the resistance moment is reduced, causing the speed to increase, the speed difference between the motor rotor and the rotating magnetic field to become smaller, causing the input current to become smaller, and the motor power to decrease.

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