# US 2019/0356186 A1 · Rotor and motor

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- Number: US 2019/0356186 A1
- Document ID: US20190356186A1
- Status: Published application
- Kind: A1
- Application number: 16/474,233
- Filed: 2017-12-22
- Published: 2019-11-21
- Earliest claimed: 2016-12-28
- Assignees: Nidec Corporation
- Applicants: Nidec Corporation
- Inventors: Akira ICHIEN; Shunsuke MURAKAMI
- Web page: https://patentgrep.com/patent/US20190356186A1

## CPC

- H02K 1/2773: {consisting of tangentially magnetized radial magnets}
- H02K 1/276: Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K 1/2781: Magnets shaped to vary the mechanical air gap between the magnets and the stator
- H02K 16/02: Machines with one stator and two {or more} rotors
- H02K 5/1737: {radially supporting the rotor around a fixed spindle; radially supporting the rotor directly}
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A rotor includes a first rotating body and a second rotating body. The first rotating body includes a first rotor core, first magnets arranged in a circumferential direction, and first outer side surfaces arranged in the circumferential direction. Each of the first outer side surfaces is an outer side surface of the first magnet or an outer side surface of the first rotor core, and includes a first circular arc surface curved in a circular arc shape with a first curvature radius and arranged on one side in the circumferential direction and a second circular arc surface curved in a circular arc shape with a second curvature radius and arranged on the other side in the circumferential direction. The second rotating body is the same as the first rotating body, and a second outer side surface is an outer side surface of a second magnet or an outer side surface of a second rotor core, and includes a third circular arc surface curved in a circular arc shape with a third curvature radius and arranged on one side in the circumferential direction and a fourth circular arc surface curved in a circular arc shape with a fourth curvature radius and arranged on the other side in the circumferential direction.

## Claims

### Claim at position 1

1-5 (canceled)

### Claim 6

A rotor comprising:
a first rotating body; and
a second rotating body arranged along a central axis extending in a vertical direction; wherein
the first rotating body includes a first rotor core having a cylindrical shape with the central axis as a center thereof, a plurality of first magnets arranged in a circumferential direction, and a plurality of first outer side surfaces arranged in the circumferential direction;
each of the plurality of first outer side surfaces is an outer side surface of the first magnet or an outer side surface of the first rotor core, and includes a first circular arc surface curved in a circular arc shape with a first curvature radius in a plan view and arranged on one side in the circumferential direction and a second circular arc surface curved in a circular arc shape with a second curvature radius different from the first curvature radius in a plan view and arranged on the other side in the circumferential direction; and
the second rotating body is positioned on a side lower than the first rotating body in an axial direction, and includes a second rotor core having a cylindrical shape with the central axis as a center thereof, a plurality of second magnets arranged in the circumferential direction, and a plurality of second outer side surfaces arranged in the circumferential direction;
each of the plurality of second outer side surfaces is an outer side surface of the second magnet or an outer side surface of the second rotor core, and includes a third circular arc surface curved in a circular arc shape with a third curvature radius in a plan view and arranged on one side in the circumferential direction and a fourth circular arc surface curved in a circular arc shape with a fourth curvature radius different from the third curvature radius in a plan view and arranged on the other side in the circumferential direction.

### Claim 7 (depends on 6)

The rotor of claim 6, wherein positions of the first rotating body and the second rotating body in the circumferential direction are deviated from each other.

### Claim 8 (depends on 6)

The rotor of claim 6, wherein the second curvature radius is greater than the fourth curvature radius, and the third curvature radius is greater than the first curvature radius.

### Claim 9 (depends on 8)

The rotor of claim 8, wherein the first curvature radius is the same as the fourth curvature radius, and the second curvature radius is the same as the third curvature radius.

### Claim 10 (depends on 6)

A motor comprising:
a shaft, to which the rotor of claim 6 is attached, extending along the central axis in a vertical direction;
a bearing rotatably supporting the shaft;
a stator facing an outer side of the rotor in a radial direction; and
a housing accommodating the rotor and the stator; wherein
the first circular arc surface is one side in a circumferential direction with respect to the third circular arc surface, the first circular arc surface is one side in the circumferential direction with respect to the second circular arc surface, the fourth circular arc surface is the other side in the circumferential direction with respect to the third circular arc surface, and the first curvature radius and the fourth curvature radius are smaller than the second curvature radius and the third curvature radius.