# US 11,909,274 B2 · Electric driving device, electric power steering device, and method for manufacturing electronic control unit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,909,274 B2 - Document ID: US11909274B2 - Status: Granted - Kind: B2 - Application number: 17/802,296 - Filed: 2022-02-10 - Published: 2023-04-20 - Granted: 2024-02-20 - Earliest claimed: 2021-02-10 - Assignees: Nsk Ltd. - Applicants: NSK Ltd. - Inventors: Masakazu Morimoto - Web page: https://patentgrep.com/patent/US11909274B2 ## CPC - B62D 5/0406: {including housing for electronic control unit} - H02K 11/33: Drive circuits, e.g. power electronics (H02K11/38 takes precedence) - B62D 5/046: {Controlling the motor} - H02K 5/225: {Terminal boxes or connection arrangements (specially adapted for submersible motors H02K5/132)} - H02K 11/30: Structural association with control circuits or drive circuits - H02K 15/14: Casings; Enclosures; Supports - H02K 21/16: having annular armature cores with salient poles (with homopolar co-operation H02K21/20) - H05K 1/14: Structural association of two or more printed circuits (providing electric connection to or between printed circuits H05K1/11, H01R12/00) - H05K 1/181: associated with surface mounted components - H05K 7/1432: {specially adapted for power drive units or power converters} - H02K 5/06: Cast metal casings - H02K 11/02: for suppression of electromagnetic interference - H02K 11/215: Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements - H02K 2203/09: Machines characterised by wiring elements other than wires, e.g. bus rings, for connecting the winding terminations - H02K 2211/03: Machines characterised by circuit boards, e.g. pcb - H05K 2201/1009: Electromotor - H05K 2201/10151: Sensor - H05K 2201/10166: Transistor - B62D: MOTOR VEHICLES; TRAILERS (steering, or guiding on a desired track, of agricultural machines or implements A01B69/00; wheels, castors, axles, increasing wheel adhesion B60B; vehicle tyres, tyre inflation or tyre changing B60C; connections between vehicles of a train or the like B60D; vehicles for use on rail and road, amphibious or convertible vehicles B60F; suspension arrangements B60G; heating, cooling, ventilating or other air treating devices B60H; windows, windscreens, non-fixed roofs, doors or similar devices, protective coverings for vehicles not in use B60J; propulsion plant arrangements, auxiliary drives, transmissions, controls, instrumentation or dashboards B60K; electric equipment or propulsion of electrically-propelled vehicles B60L; power supply for electrically-propelled vehicles B60M; passenger accommodation not otherwise provided for B60N; adaptations for load transportation or to carry special loads or objects B60P; arrangement of signalling or lighting devices, the mounting or supporting thereof or circuits therefor, for vehicles in general B60Q; vehicles, vehicle fittings or vehicle parts not otherwise provided for B60R; servicing, cleaning, repairing, supporting, lifting, or manoeuvring, not otherwise provided for, B60S; brake arrangements, brake control systems or parts thereof B60T; air-cushion vehicles B60V; motor-cycles, accessories therefor B62J, B62K; testing of vehicles G01M) - 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 electric driving device and an electric power steering device. An electric driving device includes a motor and an electronic control unit that controls rotation of the motor. The electronic control unit includes a first circuit board, a second circuit board, a second housing, a lid, and an inter-board connector. The second circuit board includes a control circuit that controls an electric current supplied to a transistor of the first circuit board. The second housing accommodates the second circuit board and has a first through hole passing therethrough in the axial direction. The lid covers the second housing. The inter-board connector connects the second circuit board disposed on the anti-load side of the second housing to the first circuit board disposed on the load side of the second housing. The inter-board connector is disposed in the first through hole. ## Claims ### Claim 1 An electric driving device comprising a motor and an electronic control unit configured to control rotation of the motor, wherein the motor comprises: a shaft extending from a load side to an anti-load side in an axial direction; a motor rotor configured to synchronize with the shaft; a motor stator comprising a motor coil and motor coil wiring for supplying electric power to the motor coil and configured to rotate the motor rotor; a first housing that accommodates the motor rotor and the motor stator; and a magnet provided on the anti-load side of the shaft, and the electronic control unit comprises: a first circuit board provided with a transistor configured to output an electric current to excite the motor coil and a rotation angle sensor disposed on an extension of the axial direction of the shaft, the first circuit board being disposed on the anti-load side of the shaft; a second circuit board comprising a control circuit configured to control an electric current supplied to the transistor; a second housing that accommodates the second circuit board and has a first through hole passing through the second housing in the axial direction; a lid that covers the second housing; and an inter-board connector that is disposed in the first through hole and that connects the second circuit board disposed on the anti-load side of the second housing to the first circuit board disposed on the load side of the second housing such that the second housing accommodating the second circuit board is disposed between the first circuit board and the second circuit board. ### Claim 2 (depends on 1) The electric driving device according to claim 1, further comprising: a power supply wiring module configured by molding, with resin, a choke coil for noise removal, a capacitor, and wiring configured to supply electric power to at least one of the first circuit board and the second circuit board, wherein the second housing has a second through hole formed in the axial direction at a position different from a position of the first through hole, and a power supply terminal extending from the power supply wiring module passes through the second through hole and is connected to the first circuit board. ### Claim 3 (depends on 2) The electric driving device according to claim 2, further comprising: a heat sink sandwiched between the power supply wiring module and the second circuit board, wherein the second housing accommodates the second circuit board, the heat sink, and the power supply wiring module. ### Claim 4 (depends on 1) The electric driving device according to claim 1, wherein the second housing has a plurality of flanges extending outward in a radial direction of the second housing and a second through hole formed in at least one of the flanges, and the lid has a third through hole at a position overlapping the second through hole in the axial direction in the lid. ### Claim 5 (depends on 1) The electric driving device according to claim 1, wherein the second housing has a plurality of flanges extending outward in a radial direction of the second housing, the second housing has a female thread formed in at least one of the flanges, the lid has a second through hole at a position overlapping the female thread in the axial direction in the lid, and the lid and the second housing are fixed by fastening a fixing member with a male thread passing through the second through hole to the female thread. ### Claim 6 (depends on 1) The electric driving device according to claim 1, wherein the inter-board connector that comprises a receptacle attached to the first circuit board and a plug attached to the second circuit board connects the second circuit board disposed on the anti-load side of the second housing to the first circuit board disposed on the load side of the second housing such that the second housing accommodating the second circuit board is disposed between the first circuit board and the second circuit board. ### Claim 7 (depends on 1) An electric power steering device comprising: an electric driving device according to claim 1, wherein the electric driving device generates auxiliary steering torque.