Electric motor and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-2016380502-A1
Application number	US-201615185757-A
Country	US
Kind code	A1
Filing date	Jun 17, 2016
Priority date	Jun 29, 2015
Publication date	Dec 29, 2016
Grant date	—

Abstract

An electric motor has: a rotor; a stator; a housing, an opening for opening the storage space upward, and a notch that is concaved downward from an edge surface surrounding the opening; a lead wire connected to the stator ; a partition wall that is provided on the inside of the notch in order to separate a sealing space for injecting a sealant and a space outside the sealing space from each other, and has a through-hole for allowing the lead wire to be extended to the outside of the sealing space; a cover that can be attached to the housing from above; and an elastic member that is more elastic than the partition wall and disposed under the partition wall. An end surface of the partition wall is disposed on or above a plane surface including the edge surface of the housing.

First claim

1 . An electric motor, comprising:
a rotor; a stator disposed around the rotor; a housing that has a storage space for storing the rotor and the stator, an opening for opening the storage space to one side of an axial direction along a central axis of rotation of the rotor, and a notch that is concaved from an edge surface surrounding the opening toward the other side of the axial direction; a lead wire connected to the stator; a partition wall that is provided on the inside of the notch of the housing in order to separate a sealing space for injecting a sealant for covering at least a part of the stator and a space outside the sealing space from each other, and has a through-hole for allowing the lead wire to be extended to the outside of the sealing space; a cover that can be attached to the housing from the one side of the axial direction; and an elastic member that is more elastic than the partition wall and overlapped with the partition wall in the axial direction, wherein an end surface of the partition wall or of the elastic member that is disposed on the one side of the axial direction is disposed on a plane surface including the edge surface of the housing or on the one side of the axial direction with respect to the plane surface, and the cover has a flat contact surface capable of coming into contact with the end surface of the partition wall or of the elastic member and the edge surface of the housing.

2 . The electric motor according to claim 1 , wherein the elastic member is disposed on the other side of the axial direction with respect to the partition wall.

3 . The electric motor according to claim 2 , further comprising:
a bolt that penetrates through the partition wall from the one side to the other side of the axial direction and is fastened to the housing, wherein the partition wall is fixed to the housing by the bolt, with the elastic member being sandwiched between the partition wall and the housing.

4 . The electric motor according to claim 1 , further comprising a side elastic member that is more elastic than the partition wall and provided between an internal surface of the housing that faces the inside of the notch and the partition wall.

5 . The electric motor according to claim 4 , wherein the partition wall has a support portion for supporting the side elastic member from the side opposite to the sealing space, and a passage that is provided on the side opposite to the support portion with respect to the side elastic member and opens the side elastic member to the sealing space.

6 . The electric motor according to claim 5 , wherein the partition wall has a restrictive surface that is provided on the side opposite to the support portion with respect to the side elastic member and restricts movement of the side elastic member toward the sealing space.

7 . A method for manufacturing an electric motor, comprising:
a preparation step of preparing an assembly that has a housing having a storage space for storing a rotor and a stator disposed around the rotor, an opening for opening the storage space to one side of an axial direction along a central axis of rotation of the rotor, and a notch concaved from an edge surface surrounding the opening toward the other side of the axial direction, the stator provided on the inside of the storage space of the housing, a partition wall that is attached to the inside of the notch of the housing in order to separate a sealing space for injecting a sealant for covering at least a part of the stator and a space outside the sealing space from each other, and a lead wire that is connected to the stator and extended to the outside of the sealing space through a through-hole formed in the partition wall; a sealing space formation step of mounting a closing member onto the partition wall and the housing from the one side of the axial direction so as to close the opening of the housing, to form the sealing space between the closing member, the housing, and the partition wall; and a sealant injection step of injecting the sealant into the sealing space during the sealing space formation step, to cover at least a part of the stator with the sealant, wherein in the preparation step, while an elastic member that is more elastic than the partition wall is overlapped with the partition wall in the axial direction, the partition wall and the elastic member are attached to the inside of the notch of the housing in such a manner that an end surface of the partition wall or of the elastic member that is disposed on the one side of the axial direction is disposed on a plane surface including the edge surface of the housing or on the one side of the axial direction with respect to the plane surface, and in the sealing space formation step, the end surface of the partition wall or of the elastic member and the edge surface of the housing are pressed by a flat pressure surface of the closing member in such a manner that the end surface of the partition wall or of the elastic member and the edge surface of the housing are placed flush with each other.

Assignees

• Kobelco Constr Mach Co Ltd

Inventors

• Koiwai Kazushige
• Saiki Seiji

Classifications

• H02K3/44 Primary

  Protection against moisture or chemical attack; Windings specially adapted for operation in liquid or gas · CPC title

• H02K15/00

  Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines · CPC title

• H02K5/225

  Terminal boxes or connection arrangements (specially adapted for submersible motors H02K5/132) · CPC title

• H02K15/12

  Impregnating, moulding insulation, heating or drying of windings, stators, rotors or machines · CPC title

• H02K3/38

  around winding heads, equalising connectors, or connections thereto · CPC title