# US 10,122,246 B2 · Multi-gap rotating electric machine with cooling oil guide channels for side stator coil

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- Number: US 10,122,246 B2
- Document ID: US10122246B2
- Status: Granted
- Kind: B2
- Application number: 15/071,732
- Filed: 2016-03-16
- Published: 2016-09-22
- Granted: 2018-11-06
- Earliest claimed: 2015-03-16
- Assignees: Denso Corporation
- Applicants: Denso Corporation
- Inventors: Takafumi Matsumoto; Hirohito Matsui; Koji Asagara; Takeo Maekawa; Keiji Kondou
- Web page: https://patentgrep.com/patent/US10122246B2

## CPC

- H02K 9/19: for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
- H02K 3/24: with channels or ducts for cooling medium between the conductors
- H02K 5/203: {specially adapted for liquids, e.g. cooling jackets}
- H02K 16/04: Machines with one rotor and two stators
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## 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.

## Claims

### Claim 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,
the protrusions and the recesses are formed alternately in a radial direction of the rotating shaft,
each of the cooling oil guide channels is formed between one radially-adjacent pair of the protrusions,
when viewed along a central axis of the rotating shaft:
on an upper part 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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 1)

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.

### Claim 4 (depends on 1)

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.

### Claim 5 (depends on 1)

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.

### Claim 6 (depends on 1)

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.

### Claim 7 (depends on 1)

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.

### Claim 8 (depends on 1)

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.

### Claim 9 (depends on 1)

The multi-gap rotating electric machine as set forth in claim 1, wherein the side stator coil is located outside the cooling oil guide channels.