Y160L-6-11KW motor running current unbalance motor overheating.

    Analysis of inspection: unstable operation of the aircraft, hand touch the chassis feeling of overheating, the measured load current three-phase unbalanced load throw off, and then measuring the no-load current phase unbalance, measured three-phase winding DC resistance unbalance. The analysis may be winding inter-turn short circuit, to heart pumping check the stator windings, did not identify the part turns overheating and insulation discoloration confirmed whether inter-turn short circuit, re-re-installed to find the weak links of the insulation with voltage idling law. When the voltage is increased by close to 500V, less than 3 minutes of idling, the motor black smoke, smell the burnt smell. Shutdown and then the disintegration of inspection, two coil turns charred, the two coils of the original turn-to-turn short circuit.

    Repair methods: full-coking due to short-circuit a few turns in the two coils insulation, not with local bandage treatment failure, since the two fault coil, replace the two new coil. Dealing with such failures should be noted that from the failed coil, do not damage neighboring coil embedded line.