# US 12,119,734 B2 · Motor with cooling medium and fins for heat dissipation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,119,734 B2 - Document ID: US12119734B2 - Status: Granted - Kind: B2 - Application number: 17/764,644 - Filed: 2020-08-21 - Published: 2022-10-20 - Granted: 2024-10-15 - Earliest claimed: 2019-09-30 - Assignees: Nidec Corporation - Applicants: Nidec Corporation - Inventors: Takaaki Bando; Takuya Matsuyama - Web page: https://patentgrep.com/patent/US12119734B2 ## CPC - H02K 9/225: {Heat pipes} - H02K 5/1732: {radially supporting the rotary shaft at both ends of the rotor (H02K5/1737 takes precedence)} - 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 7/083: {radially supporting the rotary shaft at both ends of the rotor (H02K7/086, H02K7/09 take precedence)} - H02K 9/20: wherein the cooling medium vaporises within the machine casing - H02K 2205/09: Machines characterised by drain passages or by venting, breathing or pressure compensating means - 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 rotor rotatable about a central axis and a stator including coils. The stator opposes the rotor with a gap interposed therebetween. A housing defines at least a portion of a closed chamber in which a cooling medium is housed. Heat dissipation portions are able to release heat of the cooling medium in the closed chamber to an outside. A pressure adjustment portion is able to adjust a pressure in the closed chamber. At least a portion of the coils and the rotor is housed in the closed chamber. ## Claims ### Claim 1 A motor comprising: a rotor that is rotatable about a central axis; a stator that includes coils and opposes the rotor with a gap interposed therebetween; a housing that defines at least a portion of a closed chamber in which a cooling medium is housed; heat dissipation portions that are able to release heat of the cooling medium in the closed chamber to an outside; and a pressure adjustment portion that is able to adjust a pressure in the closed chamber; wherein the pressure adjustment portion is defined by a container portion which has a variable volume; and at least a portion of the coils and the rotor is housed in the closed chamber. ### Claim 2 (depends on 1) The motor according to claim 1, wherein the rotor includes: a shaft that extends about the central axis; and a rotor body that is fixed to the shaft; and the rotor body is housed in the closed chamber. ### Claim 3 (depends on 1) The motor according to claim 1, wherein the heat dissipation portions include hollow fins on an outer surface of the housing; and an inside of the closed chamber includes insides of the heat dissipation portions. ### Claim 4 (depends on 3) The motor according to claim 3, wherein at least a portion of the heat dissipation portions is positioned above the coil in a vertical direction. ### Claim 5 (depends on 4) The motor according to claim 4, wherein all the heat dissipation portions are positioned above a stator core of the stator in the vertical direction. ### Claim 6 (depends on 3) The motor according to claim 3, wherein the closed chamber includes: a cooling chamber in which the coils are housed; an extension portion that extends upward in a vertical direction from the cooling chamber; a first connection portion that connects an inside of the extension portion and the insides of the heat dissipation portions; and a second connection portion that is positioned below the first connection portion in a vertical direction, and connects the insides of the heat dissipation portions and an inside of the cooling chamber. ### Claim 7 (depends on 6) The motor according to claim 6, wherein the extension portion is positioned above the coil in the vertical direction. ### Claim 8 (depends on 6) The motor according to claim 6, wherein the housing includes: a tubular housing body that extends in an axial direction; and a lid portion that is fixed to the housing body, and is positioned on one side of the stator in the axial direction; the lid portion includes a tubular portion that opposes an inside of the housing body in a radial direction with a gap interposed therebetween; and the extension portion is provided between the housing body and the tubular portion in the radial direction. ### Claim 9 (depends on 1) The motor according to claim 1, further comprising: a bearing that rotatably supports the rotor; wherein the bearing is housed in the closed chamber. ### Claim 10 (depends on 9) The motor according to claim 9, wherein a lubricant is mixed in the cooling medium. ### Claim 11 (depends on 1) The motor according to claim 1, wherein the cooling medium fills an entire inside or substantially an entire inside of the closed chamber. ### Claim 12 (depends on 1) The motor according to claim 1, wherein the cooling medium has an insulation property. ### Claim 13 (depends on 1) The motor according to claim 1, wherein the cooling medium is a fluorine-based compound.