# US 10,483,822 B2 · Motor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,483,822 B2 - Document ID: US10483822B2 - Status: Granted - Kind: B2 - Application number: 16/382,310 - Filed: 2019-04-12 - Published: 2019-08-01 - Granted: 2019-11-19 - Earliest claimed: 2014-08-22 - Assignees: Nidec Corporation - Applicants: Nidec Corporation - Inventors: Masato Nakanishi; Yasuo Ishiyama; Yoshinobu Nakamura; Takumi Okada - Web page: https://patentgrep.com/patent/US10483822B2 ## CPC - H02K 5/18: with ribs or fins for improving heat transfer - H02K 5/20: with channels or ducts for flow of cooling medium - H02K 5/203: {specially adapted for liquids, e.g. cooling jackets} - H02K 11/33: Drive circuits, e.g. power electronics (H02K11/38 takes precedence) - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) ## Abstract A motor includes a rotating shaft, a rotor, a stator, a bracket, and a control device mounted on the bracket. The bracket includes a cylindrical bracket main body, and a stator frame which faces the bracket main body across a clearance and holds an outer surface of the stator on the radially inward side of the bracket main body. The control device is mounted on the bracket main body. The bracket is provided with a cooling passage, and an inflow port and an outflow port connected with the cooling passage. The cooling passage includes a control device cooling passage provided between the bracket main body and the control device, a stator cooling passage provided between the bracket main body and the stator frame, and a communication passage coupling the control device cooling passage and the stator cooling passage. ## Claims ### Claim 1 A motor comprising: a rotating shaft extending in a central axial direction; a stator including a core back concentric with the rotating shaft; and a bracket housing the stator; wherein the bracket includes a cylindrical bracket main body, and a stator frame which faces the bracket main body and holds an outer surface of the stator on a radially inward side of the bracket main body, the bracket main body and the stator frame being defined by separate members; the bracket is provided with a cooling passage through which a cooling medium is able to flow, and an inflow port and an outflow port connected with the cooling passage; the cooling passage includes a first portion provided directly adjacent to a radially outermost surface of the bracket main body, a second portion provided radially between a radially innermost surface of the bracket main body and the stator frame, and a communication passage coupling an output of the first portion and an input of the second portion with each other; a cooling medium in the first portion and a cooling medium in the second portion flow in opposite circumferential directions with respect to one another; at least a portion of the communication passage is located at a position which is farther outward in a radial direction than any portion of the second portion such that the communication passage does not overlap a radially inner surface of the second portion when viewed in a direction extending along the communication passage; and a portion of the communication passage and a portion of the core back overlap one another when viewed from a radial direction which is orthogonal to both the central axial direction and the direction extending along the communication passage. ### Claim 2 (depends on 1) The motor according to claim 1, further comprising an inverter mounted on the bracket; and a control device mounted on the bracket main body; wherein the first portion of the cooling passage includes an inverter cooling passage provided radially between the radially outermost surface of the bracket main body and the inverter and a capacitor cooling passage provided radially between the radially outermost surface of the bracket main body and the control device; the second portion is a stator cooling passage that cools the stator; and the communication passage couples an output of the capacitor cooling passage and an input of the stator cooling passage with each other; and the outflow port is provided farther on a vertically lower side than the inflow port. ### Claim 3 (depends on 2) The motor according to claim 2, wherein the inflow port is connected with the capacitor cooling passage. ### Claim 4 (depends on 3) The motor according to claim 3, wherein the stator cooling passage is provided around the stator along an entire circumference thereof; the bracket includes a partition which is located between the stator frame and the bracket main body and extends in the central axial direction; in a direction in which the stator cooling passage extends, one end of the partition is provided at a same position as an end at an inflow position, at which the cooling medium flows into the stator cooling passage, on a side closer to an outflow position, at which the cooling medium flows out of the stator cooling passage; and in the direction in which the stator cooling passage extends, another end of the partition is provided at a position closer to the outflow position than the one end. ### Claim 5 (depends on 3) The motor according to claim 3, wherein the stator cooling passage is provided around the stator along an entire circumference thereof; an inflow position at which the cooling medium flows into the stator cooling passage is provided, relative to the rotating shaft, on a side opposite to an outflow position at which the cooling medium flows out of the stator cooling passage; and the outflow position is provided on a vertically lower side of the inflow position. ### Claim 6 (depends on 2) The motor according to claim 2, wherein the control device is mounted on a vertically upper side of the bracket. ### Claim 7 (depends on 6) The motor according to claim 6, wherein the communication passage extends in a vertical direction. ### Claim 8 (depends on 2) The motor according to claim 2, wherein the control device is mounted on a vertically lower side of the bracket. ### Claim 9 (depends on 8) The motor according to claim 8, wherein the communication passage extends in a vertical direction. ### Claim 10 (depends on 2) The motor according to claim 2, wherein the control device is mounted on one side in a horizontal direction of the bracket, and the capacitor cooling passage extends in a vertical direction. ### Claim 11 (depends on 2) The motor according to claim 2, wherein one end in the central axial direction of the rotating shaft protrudes from the bracket; and the control device is provided on another side in the central axial direction of the bracket. ### Claim 12 (depends on 2) The motor according to claim 2, further comprising: a capacitor cooling fin which is mounted on the control device and at least a portion of which is disposed inside the capacitor cooling passage; and an inverter cooling fin which is mounted on the inverter and at least a portion of which is disposed inside the inverter cooling passage; wherein the control device includes a capacitor; and the capacitor cooling fin is mounted on the capacitor. ### Claim 13 (depends on 12) The motor according to claim 12, wherein the inverter cooling passage and the capacitor cooling passage are provided side by side and include ends on a same side connected with each other. ### Claim 14 (depends on 13) The motor according to claim 13, further comprising a connection passage which is connected with at least one of the inverter cooling passage and the capacitor cooling passage. ### Claim 15 (depends on 2) The motor according to claim 2, wherein a portion of the capacitor cooling passage and a portion of the stator cooling passage overlap one another when viewed from the radial direction. ### Claim 16 (depends on 2) The motor according to claim 2, wherein the communication passage is located within the bracket main body at a position radially inward from the capacitor cooling passage and radially outward from the stator cooling passage. ### Claim 17 (depends on 1) The motor according to claim 1, wherein the inflow port and the outflow port are not parallel to one another; and the outflow port is inclined with respect to the radial direction. ### Claim 18 (depends on 2) The motor according to claim 2, wherein an output of the inverter cooling passage is directly connected to an input of the capacitor cooling passage and an output of the capacitor cooling passage is directly connected to an input of the stator cooling passage. ### Claim 19 (depends on 2) The motor according to claim 2, wherein a portion of the bracket main body which overlaps the rotating shaft when viewed in a direction from the control device toward the bracket is located between the cooling passage and the stator; and the inverter cooling passage includes an inverter cooling passage protrusion and the capacitor cooling passage includes a capacitor cooling passage protrusion, the inverter cooling passage protrusion and the capacitor cooling passage protrusion being provided in a bottom surface of the cooling passage at a position which overlaps the rotating shaft when viewed in the direction from the control device toward the bracket.