Mitsubishi Denki Kabushiki Kaisha

Noboru Tashiro

Mitsuhiro Nishida

Sakuei Yamamoto

Nobuo Sonoda

Kiyoshi Hani

Hiroshi Inao

A submergible motor for use in a well of water, for example, comprises a motor winding, an insulated power supply conductor for connection to a power supply, an insulated motor conductor connected to the motor winding, and a circuit element electrically connected between the power supply and motor conductors, the circuit element being encased in a molded material in a water-resistant manner and connected to the power supply and/or motor conductors.

Submergible motor including circuit element encased in molded plug

The stator core having stator coils thereon of a submersible electric motor is provided with a cylindrical can disposed in engagement with the inner surface of the stator coil and molded resin member is formed completely about the external surface of the core, the end surfaces of the core and the end portions of the coils in engagement with the end portions of the can to completely encapsulate the core and coils. The end portions of the can may be bent outwardly and embedded directly in the molded resin member during the molding thereof with the can located within the core. Alternatively, a mold tool may be located within the core for molding the molded resin member about the stator core and coils and upon removal of the tool a hollow cylindrical can may be located within the core. The end portions of the can are then sealed to the end portions of the molded member. A terminal plate and fastener fittings may also be molded integrally into the molded member. End brackets may then be secured to opposite ends of the molded resin member. The brackets are provided with bosses which extend into the can and a seal is provided between the can and the boss. The can, in conjunction with the end brackets, define a central portion for receiving a lubricant for the bearings supporting a rotor within the can.

Submersible electric motor and method of manufacturing the same

A molded submersible well motor comprises a hollow cylindrical frame 5 formed of resinous molding material into which a stator assembly having stator cores 2 and coils 3 is molded. End brackets 8 also formed of resinous molding material are detachably secured to opposite ends of the frame to close the openings thereof. A starting switch 12 for the motor is molded into the upper end bracket, together with an interconnecting terminal 9 comprising upper and lower contact posts 91, 92 for connecting the power cable 10 to the stator coils via a connector 6 and an intermediate connector 11, and a sub-receptacle 901, 930 projecting outwardly perpendicular to the main terminal 9 for connection to the starting switch.

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Fukuoka, Japan

Noboru Tashiro