# US 2021/0281139 A1 · Motor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0281139 A1 - Document ID: US20210281139A1 - Status: Published application - Kind: A1 - Application number: 17/270,750 - Filed: 2019-08-27 - Published: 2021-09-09 - Earliest claimed: 2018-08-30 - Assignees: LG Innotek Co., Ltd. - Applicants: LG Innotek Co., Ltd. - Inventors: Hee Soo LIM - Web page: https://patentgrep.com/patent/US20210281139A1 ## CPC - H02K 1/148: {Sectional cores (H02K1/141 takes precedence)} - H02K 5/04: Casings or enclosures characterised by the shape, form or construction thereof - H02K 1/146: {consisting of a generally annular yoke with salient poles} - H02K 1/185: {to outer stators} - H02K 2213/03: Machines characterised by numerical values, ranges, mathematical expressions or similar information - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) ## Abstract This embodiment relates to a motor comprising: a housing; a stator disposed within the housing; a rotor disposed inside the stator; and a shaft coupled to the rotor. The housing includes a body and a plurality of protrusions that protrude inward from the inner circumferential surface of the body, and the stator includes a stator core and a coil wound on the stator core. The inner surfaces, which are the inside surfaces of the protrusions, are in contact with the outer circumferential surface of the stator core, and the protrusions are disposed spaced apart at predetermined intervals along the circumferential direction such that gaps (G) are formed in the radial direction between the outer circumferential surface of the stator core and the inner circumferential surface of the body. Accordingly, the protrusions formed on the housing of the motor reduce the amount of contact between the housing and the stator core, and can thus improve friction torque performance. ## Claims ### Claim 1 A motor comprising: a housing; and a stator disposed in the housing, wherein the housing includes a body and a plurality of protrusions protruding inward from an inner surface of the body and disposed to be spaced apart from each other in a circumferential direction, the stator includes a stator core and a coil wound around the stator core, an outer circumferential surface of the stator core forms a circle at a radius, the inner surface of the body is spaced apart from an outer circumferential surface of the stator core, and an inner surface of the protrusion is in contact with the outer circumferential surface of the stator core. ### Claim 2 (depends on 1) The motor of claim 1, wherein: the stator core includes yokes formed in a ring shape and teeth protruding from the yokes in a radial direction, wherein the yoke includes a first region disposed on the same radius as that of the tooth and second regions extending from both ends of the first region in the circumferential direction; and the inner surface of the protrusion is in contact with an outer surface of the yoke disposed in the second region. ### Claim 3 A motor comprising: a housing; and a stator disposed in the housing, wherein the housing includes a body and a plurality of protrusions protruding inward from an inner surface of the body and disposed to be spaced apart from each other in a circumferential direction, the stator includes a stator core and a coil wound around the stator core, an outer circumferential surface of the stator core forms a circle at a radius, the stator core includes yokes and teeth protruding from the yokes in a radial direction, the yoke includes a first region disposed on the same radius as that of the tooth and second regions extending from both ends of the first region in the circumferential direction, and an inner surface of the protrusion is in contact with an outer surface of the yoke disposed in the second region. ### Claim 4 (depends on 2) The motor of claim 2, wherein a center (C2) of the plurality of protrusions in the circumferential direction is disposed on a virtual line (L) connecting a center (C) of the stator core and a center (C1) of the tooth in the radial direction. ### Claim 5 (depends on 4) The motor of claim 4, wherein a width of the first region in the circumferential direction is smaller than a distance (W1) between the plurality of protrusions in the circumferential direction. ### Claim 6 (depends on 5) The motor of claim 5, wherein the distance (W1) between the plurality of protrusions in the circumferential direction is 2.9 to 3.1 times a width (W2) of each of the plurality of protrusions in the circumferential direction. ### Claim 7 (depends on 2) The motor of claim 2, wherein the number of the plurality of protrusions is the same as the number of teeth of the stator core. ### Claim 8 (depends on 1) The motor of claim 1, wherein a length of the protrusion in a shaft direction is greater than a length of the stator core in the shaft direction. ### Claim 9 (depends on 8) The motor of claim 8, wherein a lower portion of the protrusion is disposed to be spaced apart from a lower surface of the body by a predetermined height (H). ### Claim 10 (depends on 1) The motor of claim 1, wherein the body and the protrusion are integrally formed. ### Claim 11 (depends on 2) The motor of claim 2, wherein the housing includes a groove formed between two of the protrusions in the circumferential direction. ### Claim 12 (depends on 2) The motor of claim 2, wherein the protrusion is not disposed between two virtual lines (L1) each extending along a corresponding one side surface of one of the plurality of teeth of the stator core. ### Claim 13 (depends on 3) The motor of claim 3, wherein a center (C2) of the plurality of protrusions in the circumferential direction is disposed on a virtual line (L) connecting a center (C) of the stator core and a center (C1) of the tooth in the radial direction. ### Claim 14 (depends on 13) The motor of claim 13, wherein a width of the first region in the circumferential direction is smaller than a distance (W1) between the plurality of protrusions in the circumferential direction. ### Claim 15 (depends on 14) The motor of claim 14, wherein the distance (W1) between the plurality of protrusions in the circumferential direction is 2.9 to 3.1 times a width (W2) of each of the plurality of protrusions in the circumferential direction. ### Claim 16 (depends on 3) The motor of claim 3, wherein a length of the protrusion in a shaft direction is greater than a length of the stator core in the shaft direction. ### Claim 17 (depends on 16) The motor of claim 16, wherein a lower portion of the protrusion is disposed to be spaced apart from a lower surface of the body by a predetermined height (H).