# US 2021/0344295 A1 · Inverter unit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0344295 A1 - Document ID: US20210344295A1 - Status: Published application - Kind: A1 - Application number: 17/274,028 - Filed: 2019-11-08 - Published: 2021-11-04 - Earliest claimed: 2019-02-12 - Assignees: Aisin Aw Co., Ltd. - Applicants: Aisin Aw Co., Ltd. - Inventors: Yutaka HOTTA; Seiji YASUI; Shinya OSUKA - Web page: https://patentgrep.com/patent/US20210344295A1 ## CPC - H02M 7/003: {Constructional details, e.g. physical layout, assembly, wiring or busbar connections} - H02P 27/06: using DC to AC converters or inverters (H02P27/05 takes precedence) - H02K 11/33: Drive circuits, e.g. power electronics (H02K11/38 takes precedence) - H05K 7/2089: {for power electronics, e.g. for inverters for controlling motor} - H02K 7/006: {Structural association of a motor or generator with the drive train of a motor vehicle} - H02K 11/27: Devices for sensing current, or actuated thereby (overcurrent protection responsive to temperature of the machines or parts thereof, e.g. windings, H02K11/25) - H02K 2211/03: Machines characterised by circuit boards, e.g. pcb - H02M 7/5387: in a bridge configuration - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) - H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS ## Abstract An inverter unit includes a switching element unit, a control board, a cooler, and an inverter case. The inverter case is integrally fixed to a rotating electrical machine case. The cooler is disposed so as to be in contact with the switching element unit on an opposite side to a rotating electrical machine side. The control board is disposed on the rotating electrical machine side of the switching element unit. ## Claims ### Claim 1 An inverter unit for controlling a rotating electrical machine, the inverter unit comprising: a switching element unit including switching elements that form an inverter circuit; a control board that controls switching operation of the switching elements; a cooler including, inside the cooler, a coolant channel through which a coolant passes; and an inverter case that contains the switching element unit, the control board, and the cooler, wherein the inverter case is integrally fixed to a rotating electrical machine case that contains the rotating electrical machine, the cooler is disposed so as to be in contact with the switching element unit on an opposite side of the switching element unit from the rotating electrical machine side, and the control board is disposed on the rotating electrical machine side of the switching element unit. ### Claim 2 (depends on 1) The inverter unit according to claim 1, further comprising a current sensor that detects currents flowing through wiring members that connect the inverter circuit to the rotating electrical machine, wherein the current sensor is disposed on the switching element unit side of the control board. ### Claim 3 (depends on 2) The inverter unit according to claim 2, wherein the wiring members are disposed only in an internal space surrounded by the inverter case and the rotating electrical machine case. ### Claim 4 (depends on 3) The inverter unit according to claim 3, further comprising a capacitor that is electrically connected between a direct-current power supply and the inverter circuit, wherein the capacitor is disposed on an opposite side of the cooler from the switching element unit side. ### Claim 5 (depends on 4) The inverter unit according to claim 4, wherein the control board is disposed in a direction intersecting a tangential direction at a point closest to the control board in the rotating electrical machine as viewed in an axial direction. ### Claim 6 (depends on 5) The inverter unit according to claim 5, wherein the rotating electrical machine case includes a large diameter part and a small diameter part smaller in diameter than the large diameter part, and of circuit parts mounted on the control board, a most protruding part whose protrusion height from the control board is highest is disposed in the small diameter part. ### Claim 7 (depends on 1) The inverter unit according to claim 1, further comprising a capacitor that is electrically connected between a direct-current power supply and the inverter circuit, wherein the capacitor is disposed on an opposite side of the cooler from the switching element unit side. ### Claim 8 (depends on 1) The inverter unit according to claim 1, wherein the control board is disposed in a direction intersecting a tangential direction at a point closest to the control board in the rotating electrical machine as viewed in an axial direction. ### Claim 9 (depends on 1) The inverter unit according to claim 1, wherein the rotating electrical machine case includes a large diameter part and a small diameter part smaller in diameter than the large diameter part, and of circuit parts mounted on the control board, a most protruding part whose protrusion height from the control board is highest is disposed in the small diameter part.