# US 10,483,815 B2 · Rotor, electric motor, compressor, and refrigeration air conditioner

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

- Number: US 10,483,815 B2
- Document ID: US10483815B2
- Status: Granted
- Kind: B2
- Application number: 15/558,598
- Filed: 2015-07-15
- Published: 2018-03-22
- Granted: 2019-11-19
- Earliest claimed: 2015-07-15
- Assignees: Mitsubishi Electric Corporation
- Applicants: Mitsubishi Electric Corporation
- Inventors: Atsushi Ishikawa
- Web page: https://patentgrep.com/patent/US10483815B2

## CPC

- H02K 1/276: Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K 1/02: characterised by the magnetic material
- H02K 29/03: with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
- F04B 35/04: the means being electric
- H02K 7/14: Structural association with mechanical loads, e.g. with hand-held machine tools or fans (with fan or impeller for cooling the machine H02K9/06)
- H02K 2207/03: Tubular motors, i.e. rotary motors mounted inside a tube, e.g. for blinds
- H02K 2213/03: Machines characterised by numerical values, ranges, mathematical expressions or similar information
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F)

## Abstract

A rotor includes an iron core that assumes a cylindrical or columnar shape, and a plurality of magnets embedded in the iron core and equiangularly arranged with respect to an axis of the iron core. The iron core includes a first end surface portion, a second end surface portion, and a central portion disposed between the first end surface portion and the second end surface portion. Each of the first end surface portion, the second end surface portion, and the central portion has one or more gaps formed at positions thereof remoter from the axis of the iron core than the magnets. A third cross-sectional planar dimension of the central portion is greater than a first cross-sectional planar dimension of the first end surface portion and a second cross-sectional planar dimension of the second end surface portion.

## Claims

### Claim 1

A rotor comprising:
an iron core that assumes a cylindrical or columnar shape; and
a plurality of magnets embedded in the iron core and equiangularly arranged with respect to an axis of the iron core,
the iron core comprising
a first end surface portion including a first end surface of the iron core,
a second end surface portion including a second end surface of the iron core opposed to the first end surface, and
a central portion disposed between the first end surface portion and the second end surface portion,
the plurality of magnets each penetrating through the first and second end surface portions and the central portion,
the iron core having a plurality of first gaps penetrating from the first end surface portion to the second end surface portion, and a plurality of second gaps formed from the first end surface portion without reaching the central portion, and
the first gap and the second gap being alternately arranged.

### Claim 2 (depends on 1)

The rotor according to claim 1, wherein
the iron core having a plurality of third gaps formed from the second end surface portion without reaching the central portion, and
the first gap and the third gap are alternately arranged.

### Claim 3 (depends on 2)

The rotor according to claim 2, wherein the second gaps are in an opposed relation to the third gaps with the central portion being interposed between the second gaps and the third gaps.

### Claim 4 (depends on 3)

The rotor according to claim 3, wherein a relation 0.82≤Xrc/Xr≤0.9 is satisfied, where a sum of a length of the first end surface portion, a length of the second end surface portion, and a length of the central portion is Xr in a direction along the axis and the length of the central portion is Xrc in the direction along the axis.

### Claim 5 (depends on 1)

The rotor according to claim 1, wherein the magnets are rare-earth magnets.

### Claim 6 (depends on 1)

An electric motor comprising:
a stator having a tubular shape; and
the rotor according to claim 1, the rotor being provided inside the stator such that the rotor is rotatable on the axis of the iron core.

### Claim 7 (depends on 6)

A compressor comprising the electric motor according to claim 6.

### Claim 8 (depends on 7)

A refrigeration air conditioner comprising the compressor according to claim 7.