# US 12,015,326 B2 · Motor and electric device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,015,326 B2 - Document ID: US12015326B2 - Status: Granted - Kind: B2 - Application number: 17/601,556 - Filed: 2020-03-09 - Published: 2022-06-09 - Granted: 2024-06-18 - Earliest claimed: 2019-04-11 - Assignees: Panasonic Intellectual Property Management Co., Ltd. - Applicants: Panasonic Intellectual Property Management Co., Ltd. - Inventors: Akira Yamaguchi - Web page: https://patentgrep.com/patent/US12015326B2 ## CPC - H02K 7/04: Balancing means - H02K 1/276: Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] - 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: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) ## Abstract Provided is a motor including: a rotor having a rotor core provided with a magnet insertion hole and a permanent magnet disposed in the magnet insertion hole, the rotor rotating about its axis; a stator facing the rotor; and a fixing member fixing the permanent magnet in the magnet insertion hole. The fixing member includes a protrusion fitted in a gap between the rotor core and the permanent magnet. ## Claims ### Claim 1 A motor comprising: a rotor including a rotor core provided with a magnet insertion hole and a permanent magnet disposed in the magnet insertion hole, the rotor rotating about an axis of the rotor; a stator facing the rotor; and a fixing member fixing the permanent magnet in the magnet insertion hole, the fixing member including a protrusion fitted in a gap between the rotor core and the permanent magnet wherein: the permanent magnet has a plate shape, and includes: a first magnet side surface on one side in a width direction of the permanent magnet; a second magnet side surface on another side in the width direction of the permanent magnet; a first magnet main surface on one side in a thickness direction of the permanent magnet; and a second magnet main surface on another side in the thickness direction of the permanent magnet, the magnet insertion hole has surfaces serving as inner surfaces of the rotor core, the surfaces including: a first hole main surface located inward in a radial direction intersecting the axis of the rotor core; a first hole side surface on one lateral side of the magnet insertion hole; a second hole side surface on another lateral side of the magnet insertion hole; and a second hole main surface located outward in the radial direction intersecting the axis of the rotor core, the permanent magnet is disposed in the magnet insertion hole while the first magnet main surface is located inward of the second magnet main surface in the radial direction of the rotor core, when the rotor is viewed from the direction in which the axis extends, the gap includes: a first gap between the first magnet side surface and the first hole side surface; a second gap between the second magnet side surface and the second hole side surface; and a third gap between the first magnet main surface and the first hole main surface, and the first protrusion is fitted into the first gap and the second protrusion is fitted into the second gap to fix the permanent magnet to the core. ### Claim 2 (depends on 1) The motor according to claim 1, wherein, the permanent magnet is in contact with an inner surface of the magnet insertion hole, the inner surface being located outward, of inner surfaces included in the magnet insertion hole, when viewed from a direction in which the axis extends. ### Claim 3 (depends on 1) The motor according to claim 1, wherein the fixing member is a balance weight. ### Claim 4 (depends on 1) The motor according to claim 1, wherein the first gap and the second gap are each a flux barrier. ### Claim 5 (depends on 1) The motor according to claim 1, wherein the fixing member includes, as the protrusion, a first protrusion fitted in the first gap and a second protrusion fitted in the second gap. ### Claim 6 (depends on 5) The motor according to claim 5, wherein the permanent magnet has a trapezoidal shape when the rotor is viewed from the direction in which the axis extends, and a side corresponding to the first magnet main surface is shorter than a side corresponding to the second magnet main surface. ### Claim 7 (depends on 1) The motor according to claim 1, wherein the protrusion is fitted in the third gap. ### Claim 8 (depends on 7) The motor according to claim 7, wherein the rotor core is provided with a recess that is recessed stepwise from an opening surface of the magnet insertion hole as a part of the third gap, and the protrusion is fitted in the recess. ### Claim 9 (depends on 7) The motor according to claim 7, wherein the third gap and the protrusion each have an elongated shape along the first magnet main surface of the permanent magnet when the rotor is viewed from the direction in which the rotor extends. ### Claim 10 (depends on 1) The motor according to claim 1, wherein the rotor includes a shaft that passes through the rotor core, the fixing member is provided with a through-hole through which the shaft passes, and the fixing member faces a surface of the shaft in an axial direction of the shaft. ### Claim 11 (depends on 1) The motor according to claim 1, wherein the motor includes, as the fixing member, a first fixing member facing one surface in the axial direction of the shaft and a second fixing member facing another surface in the axial direction of the shaft. ### Claim 12 (depends on 1) The motor according to claim 1, wherein the magnet insertion hole is one of multiple magnet insertion holes provided along a circumferential direction of the rotor core, the permanent magnet is one of multiple permanent magnets that are disposed in the respective magnet insertion holes, and the protrusion is one of multiple protrusions that are provided corresponding to the respective multiple permanent magnets. ### Claim 13 (depends on 1) The motor according to claim 1, wherein the fixing member is made of a non-magnetic material. ### Claim 14 (depends on 13) The motor according to claim 13, wherein the non-magnetic material is a thermoplastic resin. ### Claim 15 (depends on 1) The motor according to claim 1, wherein the rotor core and the permanent magnet are harder than the protrusion. ### Claim 16 An electric device comprising: a motor comprising: a rotor including a rotor core provided with a magnet insertion hole and a permanent magnet disposed in the magnet insertion hole, the rotor rotating about an axis of the rotor; a stator facing the rotor; and a fixing member fixing the permanent magnet in the magnet insertion hole, the fixing member including a protrusion fitted in a gap between the rotor core and the permanent magnet, wherein: the permanent magnet has a plate shape, and includes: a first magnet side surface on one side in a width direction of the permanent magnet; a second magnet side surface on another side in the width direction of the permanent magnet; a first magnet main surface on one side in a thickness direction of the permanent magnet; and a second magnet main surface on another side in the thickness direction of the permanent magnet, the magnet insertion hole has surfaces serving as inner surfaces of the rotor core, the surfaces including: a first hole main surface located inward in a radial direction intersecting the axis of the rotor core; a first hole side surface on one lateral side of the magnet insertion hole; a second hole side surface on another lateral side of the magnet insertion hole; and a second hole main surface located outward in the radial direction intersecting the axis of the rotor core, the permanent magnet is disposed in the magnet insertion hole while the first magnet main surface is located inward of the second magnet main surface in the radial direction of the rotor core, when the rotor is viewed from the direction in which the axis extends, the gap includes: a first gap between the first magnet side surface and the first hole side surface; a second gap between the second magnet side surface and the second hole side surface; and a third gap between the first magnet main surface and the first hole main surface, and the first protrusion is fitted into the first gap and the second protrusion is fitted into the second gap to fix the permanent magnet to the core. ### Claim 17 (depends on 16) The electric device according to claim 16, wherein the electric device is one of a vacuum cleaner, an air conditioner, a refrigerator, an automobile device or a robot. ### Claim 18 (depends on 1) The motor according to claim 1, wherein the third gap is provided over an entirety of the first hole main surface and has a constant width. ### Claim 19 (depends on 16) The electric device according to claim 16, wherein the third gap is provided over an entirety of the first hole main surface and has a constant width.