During the operation of the motor, the power factor changes, and its change is related to the size of the load. when the motor is running without load, the current of the stator winding is basically the reactive current component of the rotating magnetic field, and the active current component is very small, at this time, the power factor is very low.

When the motor runs with load, to output mechanical power, the active current component of the stator winding current increases, and the power factor also increases.

When the motor runs under rated load, the power factor reaches the maximum.

From this, it can be seen that the motor should avoid the phenomenon of "big horse pulling trolley".

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