# US 11,121,593 B2 · Rotor, motor, compressor, and refrigeration air conditioner

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- Number: US 11,121,593 B2
- Document ID: US11121593B2
- Status: Granted
- Kind: B2
- Application number: 16/070,542
- Filed: 2016-03-25
- Published: 2019-01-24
- Granted: 2021-09-14
- Earliest claimed: 2016-03-25
- Assignees: Mitsubishi Electric Corporation
- Applicants: Mitsubishi Electric Corporation
- Inventors: Kazuchika Tsuchida; Toshimitsu Iida
- Web page: https://patentgrep.com/patent/US11121593B2

## CPC

- H02K 1/276: Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- F04C 29/0085: {Prime movers}
- H02K 1/27: Rotor cores with permanent magnets
- H02K 1/2766: {having a flux concentration effect}
- H02K 1/28: Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
- H02K 21/16: having annular armature cores with salient poles (with homopolar co-operation H02K21/20)
- H02K 2201/06: Magnetic cores, or permanent magnets characterised by their skew
- 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})
- F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS

## Abstract

A rotor includes a rotor core and a magnet inserted into a magnet insertion hole formed in the rotor core. The magnet insertion hole extends in parallel with the rotation axis of the rotor core and, when viewed along the rotation axis, has an arcuate shape having a central portion projecting toward the rotation axis. The arcuate shape of the magnet insertion hole is formed such that the arcuate shape includes a first arcuate surface and a second arcuate surface that has a center identical to a center of the first arcuate surface and that has a radius larger than the radius of the first arcuate surface. The second arcuate surface includes two projections projecting toward the first arcuate surface. The magnet is inserted between the two projections and makes contact with the two projections.

## Claims

### Claim 1

A rotor comprising:
a rotor core; and
a magnet inserted into a magnet insertion hole formed in the rotor core, wherein
the magnet insertion hole extends in parallel with a rotation axis of the rotor core and, when viewed in cross section perpendicular to the rotation axis, has an arcuate shape having a central portion projecting toward the rotation axis,
the arcuate shape of the magnet insertion hole is formed such that the arcuate shape includes a first arcuate surface and a second arcuate surface, the second arcuate surface having a center identical to a center of the first arcuate surface and having a radius larger than a radius of the first arcuate surface,
the second arcuate surface includes two projections projecting toward the first arcuate surface,
the projections each have a projection contact surface that makes contact with the magnet, the projection contact surfaces being flat faces parallel to each other,
the magnet is inserted between the two projections, and
the magnet has two distal angled ends angled between the first arcuate surface and the second arcuate surface, the angled ends including magnet contact surfaces that make contact with the projection contact surfaces, the magnet contact surfaces being flat faces parallel to each other, the angled ends projecting beyond the projection contact surfaces into the magnet insertion hole in a space formed between distal ends of the magnet and the rotor core.

### Claim 2 (depends on 1)

A motor comprising:
a stator having a cylindrical shape; and
the rotor according to claim 1 rotatably provided inside the stator.

### Claim 3 (depends on 2)

A compressor comprising the motor according to claim 2.

### Claim 4 (depends on 3)

A refrigeration air conditioner comprising the compressor according to claim 3.