Motor overload refers to the state where the actual operating power of the motor exceeds the rated power. When the motor is overloaded, it manifests as severe heating, a decrease in speed, and even possible stalling; The motor has a low muffled sound accompanied by some vibration; If the load changes dramatically, there may also be situations where the motor speed fluctuates between high and low.

The causes of motor overload include phase loss operation, operating voltage exceeding the allowable value of rated voltage, and severe speed reduction or stagnation of the motor due to mechanical faults.

The consequences and characteristics of motor overload operation

The overload operation of a motor can seriously affect its service life. The direct manifestation of overload is that the motor current increases, causing severe heating of the motor winding. The insulation of the winding ages and fails due to excessive thermal load.

After the motor is overloaded, it can be judged from the actual state of the winding, which is manifested as the insulation part of the winding being completely blackened and brittle, and in severe cases, the insulation part being completely carbonized into powder; The insulation layer of the winding electromagnetic wire shows severe aging, and the paint film of the enameled wire becomes deeper, and in severe cases, it is in a completely detached state; And for cloud bus and wire wrapped insulated electromagnetic wire, the insulation layer is separated from the conductor.

The characteristics that distinguish overload motor windings from phase loss, turn to turn, ground to ground, and phase to phase faults are the overall aging of the winding, rather than local quality issues. Due to motor overload, it can also lead to heating problems in the bearing system. Motors that experience overload faults will emit a severe burnt odor in the surrounding environment, accompanied by strong black smoke in severe cases.

Why does overload occur during use?

In theory, applying a load according to the rated power of the motor ensures safe operation. However, when the voltage of the power supply is too high or too low, it can cause the winding to heat up and burn out; Sudden increase in motor load leading to a sudden decrease or even stoppage of motor speed is a common problem of overload during operation, especially for impact loads, which are more serious.

Another type is due to a malfunction in the bearing system, which can cause the motor to stop sweeping the chamber and burn out due to overload