# US 12,184,151 B2 · Motor housing for an axial flux motor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,184,151 B2 - Document ID: US12184151B2 - Status: Granted - Kind: B2 - Application number: 17/854,186 - Filed: 2022-06-30 - Published: 2023-11-09 - Granted: 2024-12-31 - Earliest claimed: 2022-05-06 - Assignees: BorgWarner Inc. - Applicants: BorgWarner Inc. - Inventors: Tobias Moser - Web page: https://patentgrep.com/patent/US12184151B2 ## CPC - H02K 5/203: {specially adapted for liquids, e.g. cooling jackets} - H02K 5/18: with ribs or fins for improving heat transfer - H02K 15/14: Casings; Enclosures; Supports - 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 housing 20 for an axial flux motor 10. The motor housing 20 includes at least one housing portion 22, 24 which is of at least partially double-walled configuration, in order to configure an internal cooling channel 40 in the housing portion 22, 24. The cooling channel 40 extends in a substantially annular manner in the circumferential direction 6 between an inlet 41a and an outlet 41b, in order, during operation, to produce a first cooling flow 82 which flows substantially in the circumferential direction 6 through the cooling channel 40. Furthermore, the cooling channel 40 includes a plurality of transverse ribs 50. ## Claims ### Claim 1 A motor housing (20) for an axial flux motor (10) comprising: at least one housing portion (22, 24) which is of at least partially double-walled configuration, in order to configure an internal cooling channel (40) in the housing portion (22, 24), the cooling channel (40) extending in a substantially annular manner in the circumferential direction (6) between an inlet (41a) and an outlet (41b), in order, during operation, to produce a first cooling flow (82) which flows substantially in the circumferential direction (6) through the cooling channel (40), the cooling channel (40) comprising a plurality of transverse ribs (50), at least some transverse ribs (50) protruding into the cooling channel (40) in the axial direction (2) to a lesser extent in one of a radially inner rib portion (52) or a radially outer rib portion (54) than in the respective other rib portion (52, 54), in order to form an increased rib passage (72). ### Claim 2 (depends on 1) The motor housing (20) according to claim 1, the transverse ribs (50) extending along a rib width (53) in a substantially radial direction (4) with respect to the circumferential direction (6). ### Claim 3 (depends on 1) The motor housing (20) according to claim 1, the plurality of transverse ribs (50) being configured and protruding into the cooling channel (40) so as, during operation, to produce a second cooling flow (84) which flows through the cooling channel (40) in a laterally meandering manner with respect to the first cooling flow (82). ### Claim 4 (depends on 1) The motor housing (20) according to claim 1, the housing portion (22, 24) comprising a first wall portion (22a, 24a) and a second wall portion (22b, 24b), the cooling channel (40) being formed between the first wall portion (22a, 24a) and the second wall portion (22b, 24b). ### Claim 5 (depends on 1) The motor housing (20) according to claim 1, the at least some transverse ribs (50) in the respective other rib portion (52, 54) forming a reduced rib passage (74). ### Claim 6 (depends on 1) The motor housing (20) according to claim 1, the housing portion (22, 24) comprising a plurality of fastening indentations (26), distributed in the circumferential direction (6), for attaching a stator (36) to the housing portion (22, 24), and the transverse ribs (50) which are adjacent in each case with respect to a fastening indentation (26) having configured the increased rib passage (72) on their respective radially outer rib portion (54). ### Claim 7 (depends on 1) The motor housing (20) according to claim 1, comprising at least two housing portions (22, 24) which comprise in each case at least one internal cooling channel (40). ### Claim 8 (depends on 1) An axial flux motor (10) for a fan (1) comprising: a motor housing (20) according to claim 1, a shaft (32) which is mounted rotationally in the motor housing (20), at least one rotor (34) which is arranged fixedly on the shaft (32) in the motor housing (20) for conjoint rotation, at least one stator (36) which is arranged axially adjacently with respect to the rotor (34) in the motor housing (20). ### Claim 9 (depends on 8) A high-voltage fan (1) for an electric vehicle comprising: an axial flux motor (10) according to claim 8, and a fan impeller (30) which is arranged fixedly on the shaft (32) outside the motor housing (20) for conjoint rotation. ### Claim 10 A motor housing (20) for an axial flux motor (10) comprising: at least one housing portion (22, 24) which is of at least partially double-walled configuration, in order to configure an internal cooling channel (40) in the housing portion (22, 24), the cooling channel (40) extending in a substantially annular manner in the circumferential direction (6) between an inlet (41a) and an outlet (41b), in order, during operation, to produce a first cooling flow (82) which flows substantially in the circumferential direction (6) through the cooling channel (40), the cooling channel (40) comprising a plurality of transverse ribs (50), a rib intermediate region (70) being configured between in each case two adjacent transverse ribs (50), and a flow guiding arrangement (60) being configured in at least one rib intermediate region (70). ### Claim 11 (depends on 10) The motor housing (20) according to claim 10, the flow guiding arrangement (60) comprising an undulating surface. ### Claim 12 A motor housing (20) for an axial flux motor (10) comprising: at least one housing portion (22, 24) which is of at least partially double-walled configuration, in order to configure an internal cooling channel (40) in the housing portion (22, 24), the cooling channel (40) extending in a substantially annular manner in the circumferential direction (6) between an inlet (41a) and an outlet (41b), in order, during operation, to produce a first cooling flow (82) which flows substantially in the circumferential direction (6) through the cooling channel (40), the cooling channel (40) comprising a plurality of transverse ribs (50), the housing portion (22, 24) comprising a first wall portion (22a, 24a) and a second wall portion (22b, 24b), the cooling channel (40) being formed between the first wall portion (22a, 24a) and the second wall portion (22b, 24b), comprising, furthermore, a central housing (21) for receiving a shaft (32), a rotor (34) and a stator (36) of the axial flux machine (10), the central housing (21) having an axial housing opening at a first axial end (20a), the housing portion (22) being configured as a housing cover (22a) and being arranged at the axial housing opening in order to close the latter, and the first wall portion (22a) of the housing portion (22) being configured as a housing cover (22a), and the second wall portion (22b) being configured as a cooling cover (22b) for closing the cooling channel (40). ### Claim 13 (depends on 12) The motor housing (20) according to claim 12, the cooling cover (22b) being fastened to the housing cover (22a) by way of friction stir welding. ### Claim 14 (depends on 12) The motor housing (20) according to claim 12, the cooling cover (22b) comprising at least one reinforcing element (58), and the reinforcing element (58) comprising at least one elevation (58a) or at least one depression.