# US 11,909,266 B2 · Rotor, and rotary electric machine provided with same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,909,266 B2 - Document ID: US11909266B2 - Status: Granted - Kind: B2 - Application number: 17/321,028 - Filed: 2021-05-14 - Published: 2021-09-02 - Granted: 2024-02-20 - Earliest claimed: 2018-11-15 - Assignees: Daikin Industries, Ltd.; University Public Corporation Osaka - Applicants: Daikin Industries, Ltd.; University Public Corporation Osaka - Inventors: Yoshinari Asano; Yoshihito Sanga; Masayuki Sanada; Shigeo Morimoto; Yukinori Inoue - Web page: https://patentgrep.com/patent/US11909266B2 ## CPC - H02K 1/276: Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] - H02K 1/2766: {having a flux concentration effect} - H02K 21/14: with magnets rotating within the armatures - 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 core and two or more ribs. The core has a through hole group that includes three or more through holes arranged in a circumferential direction. The through hole group is formed through a predetermined magnetic pole. The two or more ribs are configured as portions of the core, with each rib being interposed between adjacent through holes. A first of the ribs has a first inclination with respect to a magnetic pole centerline. A second of the ribs has a second inclination with respect to the magnetic pole centerline. The second inclination is larger than the first inclination. The magnetic pole centerline is a straight line that passes through a radial center line of the magnetic pole and an axial center of the rotor. The first rib is narrower than the second rib. ## Claims ### Claim 1 A rotor comprising: a core having a through hole group including three or more through holes arranged in a circumferential direction, the through hole group being formed through a predetermined magnetic pole; and two or more ribs configured as portions of the core, each of the two or more ribs being interposed between associated adjacent ones of the through holes included in the through hole group, the three or more through holes being arranged in a shape of an arc protruding toward an axial center of the rotor, the two or more ribs including at least two ribs having respective inclinations with respect to a magnetic pole centerline that are different from each other, the at least two ribs including a first rib having a first inclination with respect to the magnetic pole centerline and a second rib having a second inclination with respect to the magnetic pole centerline, the second inclination being larger than the first inclination, the magnetic pole centerline being a straight line that passes through a radial center line of the magnetic pole and an axial center of the rotor, the first rib being narrower than the second rib, and an inclination of an arbitrary rib, which is any one of the two or more ribs, with respect to the magnetic pole centerline representing an angle formed between the magnetic centerline and a straight line connecting an arbitrary point on the magnetic pole centerline to a center of the arbitrary rib, the inclination being smaller as a direction in which the arbitrary rib extends approaches a direction parallel to the magnetic pole centerline. ### Claim 2 (depends on 1) The rotor of claim 1, wherein the two or more ribs include a proximal rib apart from the magnetic pole centerline in the circumferential direction by a first distance, and a distant rib apart from the magnetic pole centerline in the circumferential direction by a second distance, the second distance being larger than the first distance, an inclination of the proximal rib with respect to the magnetic pole centerline is smaller than an inclination of the distant rib with respect to the magnetic pole centerline, and the proximal rib is narrower than the distant rib. ### Claim 3 (depends on 1) The rotor of claim 1, wherein a rib-adjacent portion of each of the through holes adjacent to an associated one of the ribs is rounded, and a first radius of curvature of rounding of one of the rib-adjacent portions adjacent to the first rib is smaller than a second radius of curvature of rounding of another one of the rib-adjacent portions adjacent to the second rib. ### Claim 4 (depends on 2) The rotor of claim 2, wherein a rib-adjacent portion of each of the through holes adjacent to an associated one of the ribs is rounded, and a first radius of curvature of rounding of one of the rib-adjacent portions adjacent to the first rib is smaller than a second radius of curvature of rounding of another one of the rib-adjacent portions adjacent to the second rib. ### Claim 5 (depends on 1) The rotor of claim 1, wherein the through hole group includes four or more even-numbered through holes, the through holes being arranged substantially symmetrically with respect to the magnetic pole centerline, and the two or more ribs include a central rib located on the magnetic pole centerline. ### Claim 6 (depends on 2) The rotor of claim 2, wherein the through hole group includes four or more even-numbered through holes, the through holes being arranged substantially symmetrically with respect to the magnetic pole centerline, and the two or more ribs include a central rib located on the magnetic pole centerline. ### Claim 7 (depends on 3) The rotor of claim 3, wherein the through hole group includes four or more even-numbered through holes, the through holes being arranged substantially symmetrically with respect to the magnetic pole centerline, and the two or more ribs include a central rib located on the magnetic pole centerline. ### Claim 8 (depends on 4) The rotor of claim 4, wherein the through hole group includes four or more even-numbered through holes, the through holes being arranged substantially symmetrically with respect to the magnetic pole centerline, and the two or more ribs include a central rib located on the magnetic pole centerline. ### Claim 9 (depends on 1) The rotor of claim 1, wherein the two or more ribs include a parallel rib extending in a direction substantially parallel to the magnetic pole centerline, and an inclined rib extending in a direction inclined with respect to the magnetic pole centerline, and the parallel rib is narrower than the inclined rib. ### Claim 10 (depends on 1) The rotor of claim 1, wherein at least a portion of each of the three or more through holes includes a permanent magnet. ### Claim 11 A dynamo-electric machine comprising: a rotor including a core having a through hole group including three or more through holes arranged in a circumferential direction, the through hole group being formed through a predetermined magnetic pole, and two or more ribs configured as portions of the core, each of the two or more ribs being interposed between associated adjacent ones of the through holes included in the through hole group; and a stator provided radially outward of the rotor, the three or more through holes being arranged in a shape of an arc protruding toward an axial center of the rotor, the two or more ribs including at least two ribs having respective inclinations with respect to a magnetic pole centerline that are different from each other, the at least two ribs including a first rib having a first inclination with respect to the magnetic pole centerline and a second rib having a second inclination with respect to the magnetic pole centerline, the second inclination being larger than the first inclination, the magnetic pole centerline being a straight line that passes through a radial center line of the magnetic pole and an axial center of the rotor, the first rib being narrower than the second rib, and an inclination of an arbitrary rib, which is any one of the two or more ribs, with respect to the magnetic pole centerline representing an angle formed between the magnetic centerline and a straight line connecting an arbitrary point on the magnetic pole centerline to a center of the arbitrary rib, the inclination being smaller as a direction in which the arbitrary rib extends approaches a direction parallel to the magnetic pole centerline. ### Claim 12 (depends on 11) The dynamo-electric machine of claim 11, wherein the two or more ribs include a proximal rib apart from the magnetic pole centerline in the circumferential direction by a first distance, and a distant rib apart from the magnetic pole centerline in the circumferential direction by a second distance, the second distance being larger than the first distance, an inclination of the proximal rib with respect to the magnetic pole centerline is smaller than an inclination of the distant rib with respect to the magnetic pole centerline, and the proximal rib is narrower than the distant rib. ### Claim 13 (depends on 11) The dynamo-electric machine of claim 11, wherein a rib-adjacent portion of each of the through holes adjacent to an associated one of the ribs is rounded, and a first radius of curvature of rounding of one of the rib-adjacent portions adjacent to the first rib is smaller than a second radius of curvature of rounding of another one of the rib-adjacent portions adjacent to the second rib. ### Claim 14 (depends on 12) The dynamo-electric machine of claim 12, wherein a rib-adjacent portion of each of the through holes adjacent to an associated one of the ribs is rounded, and a first radius of curvature of rounding of one of the rib-adjacent portions adjacent to the first rib is smaller than a second radius of curvature of rounding of another one of the rib-adjacent portions adjacent to the second rib. ### Claim 15 (depends on 11) The dynamo-electric machine of claim 11, wherein the through hole group includes four or more even-numbered through holes, the through holes being arranged substantially symmetrically with respect to the magnetic pole centerline, and the two or more ribs include a central rib located on the magnetic pole centerline. ### Claim 16 (depends on 12) The dynamo-electric machine of claim 12, wherein the through hole group includes four or more even-numbered through holes, the through holes being arranged substantially symmetrically with respect to the magnetic pole centerline, and the two or more ribs include a central rib located on the magnetic pole centerline. ### Claim 17 (depends on 13) The dynamo-electric machine of claim 13, wherein the through hole group includes four or more even-numbered through holes, the through holes being arranged substantially symmetrically with respect to the magnetic pole centerline, and the two or more ribs include a central rib located on the magnetic pole centerline. ### Claim 18 (depends on 14) The dynamo-electric machine of claim 14, wherein the through hole group includes four or more even-numbered through holes, the through holes being arranged substantially symmetrically with respect to the magnetic pole centerline, and the two or more ribs include a central rib located on the magnetic pole centerline. ### Claim 19 (depends on 11) The dynamo-electric machine of claim 11, wherein the two or more ribs include a parallel rib extending in a direction substantially parallel to the magnetic pole centerline, and an inclined rib extending in a direction inclined with respect to the magnetic pole centerline, and the parallel rib is narrower than the inclined rib. ### Claim 20 (depends on 11) The dynamo-electric machine of claim 11, wherein at least a portion of each of the three or more through holes includes a permanent magnet.