The motor is overloaded. Are the windings partially faulty or completely burned out?

Overload is a typical problem of motor products. It may be caused by a mechanical system failure of the motor body or insufficient motor capacity. It may also be an overload problem caused by the user during the operation of the motor.

When an overload problem occurs in a motor, the windings will experience varying degrees of insulation degradation. Whether the overall winding is deteriorating or is a local failure depends on the quality level of the winding body.

When the quality level of the motor winding is very consistent, when the motor is overloaded, the degree of insulation deterioration of the winding is almost the same. At this time, from the perspective of the fault appearance, the overall insulation level of the winding becomes worse. In severe cases, the insulation layer of the winding is completely cracked. Darkening problem. When the quality consistency of the motor winding is not good, that is, there are weak links in the windings, once the motor is overloaded, even a slight overload may lead to breakdown of the weak links in the insulation, that is, the windings have local phase-to-phase, ground, or Interturn insulation failure, electrical failure of the insulation stops the motor from continuing to work, and the overload phenomenon does not involve all windings.

From the process control analysis of the motor winding manufacturing process, good electrical machining technology will provide special protection for key links to ensure that there are no quality hazards during the winding, inlay, wiring and insulation processes. When electrical machining If the process is unreasonable, unnecessary failures may occur during winding operation.

Especially for motors that are directly started, special attention should be paid to the protection of the first coil. Considering the impact on the windings during the motor starting process, necessary precautions should be taken during the wiring process to ensure that the coils with potential hidden dangers are in a non-stringent state. This is highly beneficial to the reliability of the entire motor.

From the analysis of actual cases of overloaded motors, any factors that lead to poor mechanical properties of the motor will lead to poor motor performance. For example, degeneration of components, jamming of the bearing system, and severe overloading are all the culprits of motor overload.