Integrated motor bearing and rotor

摘要

An electric submersible well pump assembly includes a rotary pump and an electrical motor. The motor has a motor housing filled with a dielectric lubricant. A stator formed of a stack of stator disks with a stator bore is stationarily mounted within the motor housing. A motor shaft extends through the bore. A rotor is mounted to the shaft for rotating the shaft and has a stack of rotor disks. Axially spaced-apart radial stabilizing portions along the rotor have outer peripheries that are greater in outer diameter than remaining portions of the rotor. The outer peripheries of the stabilizing portions rotate with the rotor and are closely spaced to the inner diameter of the stator to radially stabilize the shaft.

主权项

1. An electric submersible well pump assembly, comprising:
a rotary pump; an electrical motor connected to the pump for lowering into a well, the motor comprising: a motor housing filled with a dielectric lubricant and having a longitudinal axis; a stator formed of a stack of stator disks mounted within the motor housing, the stator having an inner diameter defining a stator bore; a motor shaft extending through the bore; a rotor mounted to the shaft for rotation therewith and comprising a stack of rotor disks; axially spaced-apart radial stabilizing portions along the rotor having outer peripheries that are greater in outer diameter than remaining portions of the rotor, the outer peripheries of the stabilizing portions rotating with the rotor and being closely spaced to the inner diameter of the stator to radially stabilize the shaft; wherein: the rotor is made up of larger diameter rotor sections alternating with smaller diameter rotor sections, each of the rotor sections comprising a plurality of the rotor disks, the rotor disks within the larger diameter rotor sections having larger outer diameters than the rotor disks within the smaller diameter rotor sections; and the rotor disks of the larger diameter rotor sections serve as the stabilizing portions.