# US 8,786,155 B2 · Axial gap rotating electrical machine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,786,155 B2 - Document ID: US8786155B2 - Status: Granted - Kind: B2 - Application number: 13/210,468 - Filed: 2011-08-16 - Published: 2012-03-01 - Granted: 2014-07-22 - Earliest claimed: 2010-08-27 - Assignees: Hitachi Appliances, Inc.; Hitachi Metals, Ltd.; Hitachi Industrial Equipment Systems Co., Ltd. - Applicants: Zhuonan Wang; Yuji Enomoto; Motoya Ito; Ryoso Masaki; Hiromitsu Itabashi; Baiying Huang - Inventors: Zhuonan Wang; Yuji Enomoto; Motoya Ito; Ryoso Masaki; Hiromitsu Itabashi; Baiying Huang - Web page: https://patentgrep.com/patent/US8786155B2 ## CPC - H02K 21/24: with magnets axially facing the armatures, e.g. hub-type cycle dynamos - H02K 1/182: {to stators axially facing the rotor, i.e. with axial or conical air gap} - H02K 1/14: Stator cores with salient poles - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) ## Abstract When an axial gap rotating electrical machine is assembled, stator cores are accurately positioned and a manufacturing process therefor is simplified. The axial gap rotating electrical machine comprises: a housing frame body having a first space in the cylindrical central part thereof and multiple second spaces located in the circumferential direction which have the same distances from the center; a shaft rotatably provided in the first space in the housing frame body; a core placed in each of the second spaces in the housing frame body and a coil arranged around the core; a rotor yoke fixed on the shaft, extended in the direction of the circumference thereof, and having multiple magnets arranged in circumferential positions confronting the cores; and a case having a hole for the shaft and housing the housing frame body and the rotor yoke. ## Claims ### Claim 1 An axial gap rotating electrical machine comprising: a housing frame body having a first space in the cylindrical central part thereof, and a plurality of second spaces located in the circumferential direction which have the same distances from the center; a shaft rotatably provided in the first space in the housing frame body; a core placed in each of the plurality of the second spaces in the housing frame body and a coil arranged around the core; a rotor yoke fixed on the shaft, extended in the direction of the circumference thereof, and having a plurality of magnets arranged in circumferential positions confront the cores; and a case having a hole for the shaft and housing the housing frame body and the rotor yoke, wherein each of the plurality of the second spaces is open on one side and closed on the other side, and the axial thickness of the closed portion is smaller than the air gap between the cores housed in the housing frame body on the open side and the magnets of the rotor yoke arranged opposite to the cores. ### Claim 2 (depends on 1) The axial gap rotating electrical machine according to claim 1, wherein the numbers of the cores and the coils wound on the cores are different from the number of the magnets on the rotor yoke. ### Claim 3 (depends on 1) The axial gap rotating electrical machine according to claim 1, wherein an engaging portion for positioning a core and a coil wound on the core is provided as one part of the housing frame body which forms the second spaces. ### Claim 4 (depends on 1) The axial gap rotating electrical machine according to claim 1, wherein a nonmagnetic intervention member is provided in the air gap between the cores housed in the housing frame body and the magnets of the rotor yoke arranged opposite to the cores. ### Claim 5 (depends on 1) The axial gap rotating electrical machine according to claim 1, wherein each of the second spaces is open on one side and closed on the other side. ### Claim 6 (depends on 1) The axial gap rotating electrical machine according to claim 1, wherein the case covers both sides of the housing frame body in the axial direction and is formed integrally with the housing frame body in the direction of the circumference of the housing frame body. ### Claim 7 (depends on 1) The axial gap rotating electrical machine according to claim 1, wherein the housing frame body is made of a nonmagnetic and nonconductive material. ### Claim 8 An axial gap rotating electrical machine comprising: a housing frame body having a first space in the cylindrical central part thereof, and a plurality of second spaces located in circumferential direction with the equal distances from the center thereof; a shaft rotatably provided in the first space in the housing frame body; a core placed in each of the plurality of the second spaces in the housing frame body extending in the axial direction and a coil wound on the core; two rotor yokes fixed on the shaft, extended in the direction of the circumference thereof, and having a plurality of magnets arranged in circumferential positions confront the cores; and a case having a hole for the shaft and housing the housing frame body and the rotor yokes, wherein the two rotor yokes are provided on the shaft penetrating the central part of the housing frame body on both sides of the housing frame body, wherein each of the plurality of the second spaces is open on one side and closed on the other side, and the axial thickness of the closed portion is smaller than the air gap between the cores housed in the housing frame body on the open side and the magnets of the rotor yoke arranged opposite to the cores. ### Claim 9 (depends on 8) The axial gap rotating electrical machine according to claim 8, wherein the case covers both sides of the housing frame body in the axial direction and is formed integrally with the housing frame body in the direction of the circumference of the housing frame body. ### Claim 10 An axial gap rotating electrical machine comprising: a housing frame body having a first space in the cylindrical central part thereof, a plurality of second spaces located on the circumference at equal distances from the center thereof, and a third space intersecting with the first space and extending in the circumferential direction; a shaft rotatably provided in the first space in the housing frame body; a core placed in each of the plurality of the second spaces in the housing frame body in the axial direction and a coil arranged around the core; a rotor yoke fixed on the shaft and provided in the third space and having a plurality of magnets arranged in circumferential positions confronting the cores; and a case having a hole for the shaft and housing the housing frame body and the rotor yoke, wherein each of the plurality of the second spaces is open on one side and closed on the other side, and the axial thickness of the closed portion is smaller than the air gap between the cores housed in the housing frame body on the open side and the magnets of the rotor yoke arranged opposite to the cores.