Method of manufacturing a submersible motor

Claim 1

In a method of assembling a dynamoelectric machine having a stator unit, a main frame secured to the stator unit, and an upper end frame and a lower end frame secured to opposite ends of the main frame and having tenon fittings corresponding generally to the opposite ends of the main frame, the stator unit and end frames defining a central generally cylindrical rotor bore; the steps comprising: fitting the upper end frame on an end alignment fixture in coaxial alignment with the rotor bore; assembling the stator unit and main frame over a cylindrical alignment arbor which is coaxially aligned with the end alignment fixture and corresponds in dimension to the rotor bore; aligning the stator unit with reference to the arbor while loosely fitting the main frame into the tenon fitting of the upper end frame, and securing the main frame to the upper end frame in the position required by the stator unit reference to the arbor by applying adhesive in the tenon fitting: assembling the lower end frame on the arbor followed by securing the main frame to the lower end frame in the same manner as secured to the upper end frame; and removing the arbor and alignment fixture, thereby leaving a subassembly of the dynamoelectric machine which is precisely coaxially aligned with the rotor bore.

Claim 5

A method of assembling a submersible electric motor having a plastic encapsulant stator-unit with a tubular core, an annular main frame secured to the outside diameter of the core, an upper end frame and a lower end frame on opposite ends of the stator unit, a tubular liner on the inside surface of the core, and bearing housings on opposite ends of the stator unit, the upper bearing housing being removable and attached to the upper end frame by a screw through a corresponding longitudinal hole, and the bearing housings, liner and end frames defining a rotor bore; the steps comprising: assembling the stator unit, the tubular liner and the main frame into a subassembly; assembling the upper bearing housing on an end fixture having an inwardly projecting pin which is received by said longitudinal hole in the bearing housing, the end fixture having a central bore coaxially aligned with the rotor bore of the upper bearing housing; inserting one end of an arbor through the upper bearing housing bore and end fixture central bore, the arbor being a cylindrical member having the shape of the rotor bore; placing the upper end frame over the arbor and fitting the longitudinal hole of the end frame to the pin of the end alignment fixture; assembling said subassembly over the arbor and aligning the subassembly on the arbor, while loosely fitting one end of the main frame into a tenon fitting of the upper end frame and loosely fitting one end of the liner to an inwardly projecting flange of the upper end frame; applying adhesive between the main frame and tenon fitting and the liner and flange; placing the lower end frame on the opposite end of the arbor and fitting the lower end frame to the main frame and liner followed by securing the lower end frame to the main frame and liner similarly to the upper end frame; assembling a clamping device on the arbor outside of the lower end frame and holding the assembled parts together on the arbor and end fixture and curing the adhesive; injecting a hardenable plastic into the spaces between said subassembly and end frames to encapsulate the stator unit and bond said subassembly to the end frames and curing the plastic; removing the clamping device, the arbor and the upper bearing housing; assembling motor parts in the rotor bore; and replacing the bearing housing, whereby a submersible motor is manufactured with a precisely aligned rotor bore.