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An electrical motor for a submersible well pump assembly has a brush for preventing arcing across the bearings. The motor has a housing and a stator stationarily mounted in the housing. A shaft extends through a cavity in the stator, the shaft carrying a rotor. Bearings are located at the base and h

An electrical motor for a submersible well pump assembly has a brush for preventing arcing across the bearings. The motor has a housing and a stator stationarily mounted in the housing. A shaft extends through a cavity in the stator, the shaft carrying a rotor. Bearings are located at the base and head of the pump for stabilizing the shaft in the housing. A brush is stationarily carried by the housing in electrical common with the stator in the housing. The brush is also in sliding engagement with the shaft. The brush is located near one of the ends of the housing to reduce arcing across the bearing because of voltage differential between the shaft and the stator.

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[ We claim:] [1.] In a submersible well pump assembly having a multi-stage pump driven by an electrical motor having a housing, a shaft mounted on bearings in the housing, a stator stationarily mounted in the housing, a rotor mounted to the shaft for rotation therewith and extending through the stat

[ We claim:] [1.] In a submersible well pump assembly having a multi-stage pump driven by an electrical motor having a housing, a shaft mounted on bearings in the housing, a stator stationarily mounted in the housing, a rotor mounted to the shaft for rotation therewith and extending through the stator, the housing being filled with a dielectric liquid, the improvement comprising:an electrical brush assembly stationarily carried by and in electrical common with the housing, the brush assembly having a brush member of conductive material in sliding engagement with the shaft, the brush assembly being immersed in the dielectric lubricant.