Research of hysteresis loss in large dry submersible motor with the fault of static eccentricity

In this paper, a model of dry submersible motor with the static eccentricity was established to calculate the magnetic field and hysteresis loss. It is obvious that static eccentricity (SE) can affect the electromagnetic parameter. Therefore, the magnetic flux density of stator was researched based on Maxwell theory, including stator yoke and teeth. The faults of eccentricity can make the magnetic field intensity distorted according to the calculated results. Based on the iron loss separation model, the hysteresis loss was investigated both under normal and static eccentricity conditions. The comparison between the two conditions shows that hysteresis loss increased with the fault of static eccentricity. What´s more, the conclusion can provide a method to detect the fault of air gap static eccentricity.