# US 12,009,698 B2 · Rotor, electric motor, fan, and air conditioner > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,009,698 B2 - Document ID: US12009698B2 - Status: Granted - Kind: B2 - Application number: 17/770,088 - Filed: 2019-12-12 - Published: 2022-11-24 - Granted: 2024-06-11 - Earliest claimed: 2019-12-12 - Assignees: Mitsubishi Electric Corporation - Applicants: Mitsubishi Electric Corporation - Inventors: Takaya Shimokawa; Hiroki Aso; Naoki Tamura - Web page: https://patentgrep.com/patent/US12009698B2 ## CPC - H02K 1/276: Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] - H02K 1/2746: the rotor consisting of magnets arranged with the same polarity, e.g. consequent pole type - 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 1/246: {Variable reluctance rotors} - H02K 2201/03: Machines characterised by aspects of the air-gap between rotor and stator - H02K 2211/03: Machines characterised by circuit boards, e.g. pcb - 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}) ## Abstract A rotor includes a plurality of cores stacked in an axial direction, a permanent magnet, and a nonmagnetic resin. The plurality of cores include a magnet insertion hole, a first opening communicating with one end of the magnet insertion hole in a circumferential direction, and an indent part communicating with the first opening and indented in the circumferential direction. The permanent magnet is disposed in the magnet insertion hole. The nonmagnetic resin is provided in the first opening and the indent part. ## Claims ### Claim 1 A rotor comprising: a plurality of cores including a magnet insertion hole, a first opening communicating with one end of the magnet insertion hole in a circumferential direction, and an indent part communicating with the first opening and indented in the circumferential direction, the plurality of cores being stacked in an axial direction; a permanent magnet disposed in the magnet insertion hole; and a nonmagnetic resin provided in the first opening and the indent part, wherein the indent part is formed between two adjacent cores of the plurality of cores. ### Claim 2 (depends on 1) The rotor according to claim 1, wherein the plurality of cores include a first closing part closing another end of the magnet insertion hole in the circumferential direction. ### Claim 3 (depends on 1) The rotor according to claim 1, wherein the rotor satisfies Rr1>Rc1, where Rc1 is a maximum radius of the plurality of cores and Rr1 is a maximum radius of the nonmagnetic resin. ### Claim 4 (depends on 1) The rotor according to claim 1, wherein the rotor satisfies Rc3>Rc2 and Rr1>Rc2, where Rc2 is a radius of the plurality of cores in an inter-pole part, Rc3 is a radius of the plurality of cores in a magnetic pole center part, and Rr1 is a maximum radius of the nonmagnetic resin. ### Claim 5 (depends on 4) The rotor according to claim 4, wherein the rotor satisfies Rr1≤Rc3. ### Claim 6 (depends on 1) The rotor according to claim 1, wherein the nonmagnetic resin is in contact with the permanent magnet. ### Claim 7 (depends on 1) The rotor according to claim 1, further comprising: an additional nonmagnetic resin disposed outside the plurality of cores in the axial direction, wherein the nonmagnetic resin provided in the first opening and the indent part and the additional nonmagnetic resin are integrated as one member. ### Claim 8 (depends on 1) The rotor according to claim 1, wherein the plurality of cores have a flat surface that tilts toward the first opening. ### Claim 9 (depends on 1) The rotor according to claim 1, wherein the plurality of cores include a curved surface that tilts toward the first opening, and a space communicating with the indent part, the nonmagnetic resin not being provided in the space. ### Claim 10 (depends on 1) The rotor according to claim 1, wherein the permanent magnet forms a first magnetic pole of the rotor, and a part of the plurality of cores adjacent to the permanent magnet in the circumferential direction forms a second magnetic pole having a polarity different from a polarity of the first magnetic pole, and the second magnetic pole is a pseudo-magnetic pole of the rotor. ### Claim 11 (depends on 10) The rotor according to claim 10, wherein the rotor satisfies S1>S2, where S1 is a surface area of an outer peripheral surface of the first magnetic pole that is in contact with the nonmagnetic resin, and S2 is a surface area of an outer peripheral surface of the second magnetic pole that is in contact with the nonmagnetic resin. ### Claim 12 (depends on 1) The rotor according to claim 1, wherein a first core of the plurality of cores has the first opening communicating with a downstream side of the magnet insertion hole in a rotation direction of the rotor, and a second core of the plurality of cores has the first opening communicating with an upstream side of the magnet insertion hole in the rotation direction of the rotor. ### Claim 13 (depends on 12) The rotor according to claim 12, further comprising third cores stacked at both ends of the plurality of cores in the axial direction, wherein each of the third cores includes a hole communicating with the magnet insertion hole and is not provided with the first opening, and in a plane orthogonal to the axial direction, an outer periphery of the hole is closed by the third core. ### Claim 14 (depends on 1) The rotor according to claim 1, wherein the plurality of cores include a second opening communicating with another end of the magnet insertion hole in the circumferential direction, and the nonmagnetic resin is also provided in the second opening. ### Claim 15 (depends on 14) The rotor according to claim 14, further comprising an additional nonmagnetic resin disposed outside the plurality of cores in the axial direction and in the second opening, wherein the nonmagnetic resin and the additional nonmagnetic resin are integrated as one member. ### Claim 16 (depends on 14) The rotor according to claim 14, further comprising second cores stacked at both ends of the plurality of cores in the axial direction, wherein each of the second cores includes a hole communicating with the magnet insertion hole and is not provided with the first opening, and in a plane orthogonal to the axial direction, a periphery of the hole is closed by the second cores. ### Claim 17 (depends on 1) An electric motor comprising: the rotor according to claim 1; and a stator disposed outside the rotor. ### Claim 18 (depends on 17) A fan comprising: a blade; and the electric motor according to claim 17 to drive the blade. ### Claim 19 (depends on 17) An air conditioner comprising: an indoor unit; and an outdoor unit connected to the indoor unit, wherein the indoor unit, the outdoor unit, or both the indoor unit and the outdoor unit include the electric motor according to claim 17.