Induction motor winding is made up of many coils (turns) of wire, if the insulation is not good, the superimposed between the coils will be short-circuited, so that a part of the coil is directly short-circuited off does not work. If the asynchronous motor has a short circuit between turns, then the vibration will increase, the current will increase, and the output will be relatively reduced.

       The short circuit between turns is because a part of the winding of the motor is shorted out, the magnetic field is different from before, it is asymmetrical, and the remaining coil current is larger than before, which will cause the abnormal operation of the motor.

       The short-circuit turns of inter-turn fault are inside the motor, and under the action of alternating magnetic field, induced electromotive force is generated, and the short-circuit turns form a self-loop. The induced electromotive force creates a large current in this closed loop with very little resistance.

       The current is as high as several times the rated current, so that the temperature of the short circuit turns is higher than other turns, a long time, the insulation material will age, brittle fall off, starting from the insulation damage between turns, and eventually may lead to the breakdown of the insulation between phases or to the ground, and eventually burn out the three-phase asynchronous motor.

       Therefore, in order to extend the operating life of the motor, it is necessary to improve the excellent electromechanical strength and process performance of the interturn insulation.

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