Turn-to-turn short circuit occurs in the motor winding, the following phenomena will occur:

1) A large loop (usually 2-10 times the normal current) will flow through the short-circuited coil, which will cause the coil to heat up severely;

2) The current is unbalanced and the torque of the motor is reduced;

3) Generate noise;

4) When the short circuit is serious, the motor cannot start with load.

Turn-to-turn short circuit initially may only have two wires touching due to worn insulation at the overlap.

Due to the circulation in the short-circuited wire turns, the coil heats up rapidly, further damaging the insulation of the adjacent wires, increasing the number of short-circuited turns and expanding the fault.

When the number of short-circuit turns is large enough, the fuse will be blown, and even the winding will burn and smoke.

The average torque of the motor drops significantly, and it becomes weak when dragging the load.

Reasons for inter-turn short circuit of motor winding

Reasons for inter-turn short circuit of motor winding

1) Poor manufacturing process. For example: inter-turn insulation is damaged during off-line, shaping and other processes; hard blocks and burrs on copper wires will also cause inter-turn insulation damage.

2) During operation, under the action of comprehensive stresses such as electricity, heat and machinery, the windings are deformed and displaced, causing the inter-turn insulation to break, wear and fall off; in addition, due to dirt, etc., it may also cause inter-turn (especially rotor between the ends of the windings) short circuit.

3) Long-term operation and aging insulation will also cause inter-turn short circuit.

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