Patent ID: RE41627

Claim:
A submersible motor unit for use in driving a pump with the pump submerged in liquid, said motor unit comprising a tubular housing member, a stator at least partially enclosed by said tubular housing member, a tubular inner member at least partially enclosed by said stator, said tubular inner member being disposed in a coaxial relationship with said tubular housing member, a rotor at least partially enclosed by said tubular inner member, a drive shaft connected with said rotor, a first end wall connected with said tubular housing member and said tubular inner member, a first bearing disposed between said first end wall and said drive shaft, a second end wall connected with said tubular housing member and said tubular inner member, a second bearing disposed between said second end wall and said drive shaft, said first and second end walls and said tubular inner member cooperating to at least partially define a rotor chamber in which said rotor is disposed, said rotor being rotatably supported by said first and second bearings for rotation about a central axis of said rotor chamber, said tubular inner member and said tubular housing member cooperating with said first and second end walls to at least partially define a stator chamber in which said stator is disposed, said stator chamber extends around and is located radially outward of said rotor chamber, an annular capacitor disposed in said stator chamber in an axially spaced apart relationship with said stator, said annular capacitor extends around said rotor chamber, and a body of potting compound disposed in said stator chamber and at least partially enclosing said stator and said annular capacitor.