# US 2019/0173343 A1 · Motor

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- Number: US 2019/0173343 A1
- Document ID: US20190173343A1
- Status: Published application
- Kind: A1
- Application number: 16/323,909
- Filed: 2017-08-08
- Published: 2019-06-06
- Earliest claimed: 2016-08-09
- Assignees: Nidec Corporation
- Applicants: Nidec Corporation
- Inventors: Yasuo YAMAGUCHI
- Web page: https://patentgrep.com/patent/US20190173343A1

## CPC

- H02K 1/28: Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
- H02K 1/276: Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K 1/32: with channels or ducts for flow of cooling medium
- H02K 5/203: {specially adapted for liquids, e.g. cooling jackets}
- H02K 7/116: with gears
- H02K 9/19: for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
- F16H 57/043: {within rotary parts, e.g. axial channels or radial openings in shafts}
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- F16H: GEARING

## Abstract

A motor includes a rotor to rotate about a motor axis, and a stator radially outside of the rotor. The rotor includes a shaft extending along the motor axis, and including a collar portion and a screw portion located along an axial direction on an outer circumferential surface thereof, a rotor core surrounding the shaft from radially outside, a rotor magnet fixed to the rotor core, a pair of plate-shaped end plates on both axial sides of the rotor core, and a nut screwed onto the screw portion. The rotor core and the pair of end plates are held between the collar portion and the nut. Each end plate includes a first surface opposite to an axial end surface of the rotor core, and a second surface facing away from the first surface. The first surface includes a slanting surface that slants toward the rotor core and extends radially outward, and is in contact with the axial end surface of the rotor core.

## Claims

### Claim at position 1

1-4. (canceled)

### Claim 5

A motor comprising:
a rotor to rotate about a motor axis; and
a stator radially outside of the rotor; wherein
the rotor includes:
a shaft extending along the motor axis, and including a collar portion and a screw portion located along an axial direction on an outer circumferential surface thereof;
a rotor core surrounding the shaft from radially outside;
a rotor magnet fixed to the rotor core;
a pair of plate-shaped end plates on both axial sides of the rotor core; and
a nut screwed onto the screw portion;
the rotor core and the pair of end plates are held between the collar portion and the nut;
each of the end plates includes a first surface opposite to an axial end surface of the rotor core, and a second surface facing away from the first surface;
the first surface includes a slanting surface that slants toward the rotor core as the slanting surface extends radially outward; and
the slanting surface is in contact with the axial end surface of the rotor core.

### Claim 6 (depends on 5)

The motor according to claim 5, wherein
the rotor core includes a magnet holding hole extending therethrough along the axial direction;
the rotor magnet is inserted in the magnet holding hole; and
the slanting surface is at or adjacent to an opening of the magnet holding hole.

### Claim 7 (depends on 5)

The motor according to claim 5, wherein
the shaft includes a hollow portion including an inner circumferential surface extending along the axial direction, and communicating holes each extending in a radial direction to bring a space outside of the shaft and the hollow portion into communication with each other, the hollow portion being structured to allow oil to be fed thereinto;
each end plate includes a plate through hole radially inward of the slanting surface and extending in the axial direction, and a first recessed portion in the first surface and extending radially inward from the plate through hole;
the first recessed portion is connected to a corresponding one of the communicating holes at a radially inner end thereof;
the rotor core covers an opening of the first recessed portion;
the nut and an adjacent one of the end plates are arranged to have a washer interposed therebetween;
each end plate includes a second recessed portion in the second surface and extending radially outward from the plate through hole;
the second recessed portion of one of the pair of end plates includes an axially-facing opening including a covered portion being covered with the collar portion, and an open portion not being covered with the collar portion; and
the second recessed portion of another one of the pair of end plates includes an axially-facing opening including a covered portion being covered with the washer, and an open portion not being covered with the washer.

### Claim 8 (depends on 6)

The motor according to claim 6, wherein
the shaft includes a hollow portion including an inner circumferential surface extending along the axial direction, and communicating holes each extending in a radial direction to bring a space outside of the shaft and the hollow portion into communication with each other, the hollow portion being structured to allow oil to be fed thereinto;
each end plate includes a plate through hole radially inward of the slanting surface and extending in the axial direction, and a first recessed portion in the first surface and extending radially inward from the plate through hole;
the first recessed portion is connected to a corresponding one of the communicating holes at a radially inner end thereof;
the rotor core covers an opening of the first recessed portion;
the nut and an adjacent one of the end plates are arranged to have a washer interposed therebetween;
each end plate includes a second recessed portion in the second surface and extending radially outward from the plate through hole;
the second recessed portion of one of the pair of end plates includes an axially-facing opening including a covered portion being covered with the collar portion, and an open portion not being covered with the collar portion; and
the second recessed portion of another one of the pair of end plates includes an axially-facing opening including a covered portion being covered with the washer, and an open portion not being covered with the washer.

### Claim 9 (depends on 5)

The motor according to claim 5, wherein
the shaft includes a hollow portion including an inner circumferential surface extending along the axial direction, and communicating holes each extending in a radial direction to bring a space outside of the shaft and the hollow portion into communication with each other, the hollow portion being structured to allow oil to be fed thereinto;
each end plate includes a plate through hole radially inward of the slanting surface and extending in the axial direction, and a first recessed portion in the first surface and extending radially inward from the plate through hole;
the first recessed portion is connected to a corresponding one of the communicating holes at a radially inner end thereof;
the rotor core covers an opening of the first recessed portion;
the rotor core includes a core through hole extending therethrough along the axial direction;
the core through hole connects the first recessed portions of the pair of end plates to each other; and
at least a portion of an opening of the core through hole is radially outward of the plate through hole.

### Claim 10

The motor according to 6, wherein
the shaft includes a hollow portion including an inner circumferential surface extending along the axial direction, and communicating holes each extending in a radial direction to bring a space outside of the shaft and the hollow portion into communication with each other, the hollow portion being structured to allow oil to be fed thereinto;
each end plate includes a plate through hole radially inward of the slanting surface and extending in the axial direction, and a first recessed portion in the first surface and extending radially inward from the plate through hole;
the first recessed portion is connected to a corresponding one of the communicating holes at a radially inner end thereof;
the rotor core covers an opening of the first recessed portion;
the rotor core includes a core through hole extending therethrough along the axial direction;
the core through hole connects the first recessed portions of the pair of end plates to each other; and
at least a portion of an opening of the core through hole is radially outward of the plate through hole.

### Claim 11 (depends on 7)

The motor according to claim 7, wherein
the rotor core includes a core through hole extending therethrough along the axial direction;
the core through hole connects the first recessed portions of the pair of end plates to each other; and
at least a portion of an opening of the core through hole is radially outward of the plate through hole.

### Claim 12 (depends on 8)

The motor according to claim 8, wherein
the rotor core includes a core through hole extending therethrough along the axial direction;
the core through hole connects the first recessed portions of the pair of end plates to each other; and
at least a portion of an opening of the core through hole is radially outward of the plate through hole.