Multi-gap rotating electric machine

Patent metadata

Field	Value
Publication number	US-2016276904-A1
Application number	US-201615071732-A
Country	US
Kind code	A1
Filing date	Mar 16, 2016
Priority date	Mar 16, 2015
Publication date	Sep 22, 2016
Grant date	—

Abstract

In a multi-gap rotating electric machine, a side stator coil is received in a side space formed in a housing to connect radially inner and radially outer stator coils across a rotor. A cooling oil flow adjustment member is provided to adjust flow of cooling oil in the side space. The adjustment member has cooling oil guide channels formed on an uneven surface thereof facing the side stator coil. When viewed along a central axis of a rotating shaft: on an upper apart of the uneven surface which is located above the central axis, the cooling oil guide channels spread from a reference line to both sides of the reference line while extending downward; and on a lower part of the uneven surface which is located below the central axis, the cooling oil guide channels converge on the reference line from both sides of the reference line while extending downward.

First claim

What is claimed is:

1 . A multi-gap rotating electric machine comprising:
a housing; a rotating shaft rotatably supported by the housing; an annular rotor mechanically connected to the rotating shaft so as to rotate together with the rotating shaft; an inner stator including an inner stator core and an inner stator coil, the inner stator core being arranged radially inside the rotor with a radially inner gap formed between the inner stator core and the rotor, the inner stator coil being wound on the inner stator core; an outer stator including an outer stator core and an outer stator coil, the outer stator core being arranged radially outside the rotor with a radially outer gap formed between the outer stator core and the rotor, the outer stator coil being wound on the outer stator core; a side stator coil arranged on one axial side of the rotor to connect the inner and outer stator coils radially across the rotor; a side space which is formed between axial end surfaces of the inner and outer stator cores and an interior side surface of the housing and in which the side stator coil is received; a cooling oil introduction passage formed in an upper part of the housing to introduce cooling oil from outside of the housing to the side space, the cooling oil introduction passage having a cooling oil inlet formed at its upper end so as to be open to the outside of the housing and a cooling oil outlet formed at its lower end so as to be open to the side space; and a cooling oil flow adjustment member provided between the interior side surface of the housing and the side stator coil to adjust flow of the cooling oil in the side space, wherein the cooling oil flow adjustment member has an uneven surface that faces the side stator coil through a cooling oil flow gap formed therebetween and includes a plurality of protrusions and a plurality of recesses, the protrusions and the recesses together form a plurality of cooling oil guide channels on the uneven surface of the cooling oil flow adjustment member, when viewed along a central axis of the rotating shaft: on an upper apart of the uneven surface which is located above the central axis of the rotating shaft, the cooling oil guide channels spread from a reference line to both sides of the reference line while extending downward; and on a lower part of the uneven surface which is located below the central axis of the rotating shaft, the cooling oil guide channels converge on the reference line from both sides of the reference line while extending downward.

2 . The multi-gap rotating electric machine as set forth in claim 1 , wherein when viewed along the central axis of the rotating shaft, the reference line coincides with a central axis of the cooling oil outlet of the cooling oil introduction passage.

3 . The multi-gap rotating electric machine as set forth in claim 1 , wherein the reference line vertically extends through the central axis of the rotating shaft.

4 . The multi-gap rotating electric machine as set forth in claim 1 , wherein the cooling oil flow adjustment member is formed as a separate member from the housing and fixed to the interior side surface of the housing so as to make up an integral body with the housing.

5 . The multi-gap rotating electric machine as set forth in claim 1 , wherein the cooling oil flow adjustment member has a hardness lower than an insulating-coat hardness of the side stator coil.

6 . The multi-gap rotating electric machine as set forth in claim 1 , wherein the cooling oil flow adjustment member is made of an electrically insulative material whose hardness is lower than or equal to E50 according to JIS B 7726.

7 . The multi-gap rotating electric machine as set forth in claim 1 , wherein the uneven surface of the cooling oil flow adjustment member is formed so that the protrusions and the recesses extend straight in each of a plurality of directions.

8 . The multi-gap rotating electric machine as set forth in claim 1 , wherein the uneven surface of the cooling oil flow adjustment member is formed so that the protrusions and the recesses extend in a curved manner.

Assignees

• Denso Corp

Inventors

• Matsumoto Takafumi
• Matsui Hirohito
• Asagara Koji
• Maekawa Takeo
• Kondou Keiji

Classifications

• H02K9/19 Primary

  for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil · CPC title

• H02K16/04

  Machines with one rotor and two stators · CPC title

• H02K1/20

  with channels or ducts for flow of cooling medium · CPC title

• H02K5/20

  with channels or ducts for flow of cooling medium · CPC title

• H02K5/203

  specially adapted for liquids, e.g. cooling jackets · CPC title