# US 12,113,398 B2 · Stator core, stator unit, and motor

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,113,398 B2
- Document ID: US12113398B2
- Status: Granted
- Kind: B2
- Application number: 17/768,270
- Filed: 2020-10-01
- Published: 2024-04-25
- Granted: 2024-10-08
- Earliest claimed: 2019-10-16
- Assignees: NHK Spring Co., Ltd.
- Applicants: Nhk Spring Co., Ltd.
- Inventors: Yohei Kameda
- Web page: https://patentgrep.com/patent/US12113398B2

## CPC

- H02K 1/18: Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
- H02K 1/185: {to outer stators}
- H02K 21/14: with magnets rotating within the armatures
- H02K 1/2706: Inner rotors
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A stator core that is configured by stacking plural core plates and that is housed inside a case of a motor. The plural core plates include an elastic protrusion-equipped core plate provided with plural elastic protrusions arrayed in a circumferential direction. The elastic protrusions extend toward a radial direction outside from an outer peripheral portion of the elastic protrusion-equipped core plate and are bent in an axial direction. The stator core is supported by the case in a state in which the plural elastic protrusions are in contact with an inner peripheral face of the case and elastically flexed.

## Claims

### Claim 1

A stator core that is configured by stacking a plurality of core plates and that is housed inside a case of a motor, wherein:
the plurality of core plates include a plurality of elastic protrusion-equipped core plates provided with a plurality of elastic protrusions arrayed in a circumferential direction, the elastic protrusions extending toward a radial direction outside from an outer peripheral portion of the elastic protrusion-equipped core plates and being bent in an axial direction; and
the stator core is supported by the case in a state in which the plurality of elastic protrusions are in contact with an inner peripheral face of the case and elastically flexed,
wherein the plurality of core plates include a plurality of flat protrusion-equipped core plates provided with a plurality of flat protrusions arrayed in the circumferential direction so as to extend toward the radial direction outside from an outer peripheral portion of the flat protrusion-equipped core plates,
wherein leading end portions of the plurality of flat protrusions are arranged opposing the inner peripheral face of the case across a gap,
wherein the plurality of elastic protrusions are bent to one side in the axial direction,
wherein the plurality of flat protrusion equipped core plates are stacked on another side of the plurality of elastic protrusion-equipped core plates in the axial direction, and
wherein the plurality of elastic protrusions and the plurality of flat protrusions are arranged side by side in the axial direction.

### Claim 2 (depends on 1)

The stator core of claim 1, wherein the plurality of elastic protrusions include an inward-facing elastic protrusion with a leading end portion that is bent so as to face a radial direction inside of the elastic protrusion-equipped core plate.

### Claim 3 (depends on 1)

The stator core of claim 1, wherein quenching is performed on the plurality of elastic protrusions.

### Claim 4 (depends on 1)

A stator unit comprising:
a case of a motor; and
the stator core of claim 1 housed inside the case.

### Claim 5

A stator unit comprising:
a case of a motor; and
a stator core that is configured by stacking a plurality of core plates and that is housed inside the case of the motor,
wherein the plurality of core plates include an elastic protrusion-equipped core plate provided with a plurality of elastic protrusions arrayed in a circumferential direction, the elastic protrusions extending toward a radial direction outside from an outer peripheral portion of the elastic protrusion-equipped core plate and being bent in an axial direction,
wherein the stator core is supported by the case in a state in which the plurality of elastic protrusions are in contact with an inner peripheral face of the case and elastically flexed,
wherein a plurality of grooves, into which the plurality of elastic protrusions are configured to be inserted, are arrayed in a circumferential direction at the inner peripheral face of the case, and
wherein a gap is provided between the inner peripheral face of the case and an outer peripheral face of the stator core.

### Claim 6 (depends on 5)

The stator unit of claim 5, wherein, in a case in which the stator core is displaced in a radial direction with respect to the case, a part of the outer peripheral face of the stator core contacts a part of the inner peripheral face of the case within an elastic deformation range of the plurality of elastic protrusions.

### Claim 7 (depends on 4)

A motor comprising:
the stator unit of claim 4; and
a rotor core housed inside the stator core included in the stator unit.