# US 9,882,441 B2 · Motor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,882,441 B2 - Document ID: US9882441B2 - Status: Granted - Kind: B2 - Application number: 14/516,843 - Filed: 2014-10-17 - Published: 2015-06-18 - Granted: 2018-01-30 - Earliest claimed: 2013-12-12 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Sung Il Kim; Seong Taek Lim - Web page: https://patentgrep.com/patent/US9882441B2 ## CPC - H02K 1/2773: {consisting of tangentially magnetized radial magnets} - H02K 1/146: {consisting of a generally annular yoke with salient poles} - H02K 21/16: having annular armature cores with salient poles (with homopolar co-operation H02K21/20) - 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 including a stator, and a rotor adapted to rotate, wherein the stator includes a stator body, a plurality of teeth protruding from the stator body toward the rotor, and at least one stator magnetic barrier provided to each of the teeth to interrupt magnetic flux. A magnetic field produced in a direction parallel to the outer circumferential surface of the rotor is attenuated, and therefore demagnetization of permanent magnets included in the rotor may be prevented. ## Claims ### Claim 1 A motor comprising: a stator; and a rotor adapted to rotate, wherein the stator comprises a stator body, a plurality of teeth protruding from the stator body toward the rotor, and at least one stator magnetic barrier provided to each of the teeth to interrupt magnetic flux, wherein the plurality of teeth include a first tooth and a second tooth provided adjacent to the first tooth, and a first stator magnetic barrier is formed at one side of the first tooth in a clockwise direction at a portion of the first tooth close to the rotor and a second stator magnetic barrier is formed at one side of the second tooth in a counterclockwise direction at a portion of the second tooth close to the rotor. ### Claim 2 (depends on 1) The motor according to claim 1, wherein the first tooth and the second tooth are alternately disposed along an inner circumferential surface of the stator. ### Claim 3 (depends on 1) The motor according to claim 1, wherein the first and second stator magnetic barriers attenuate a strength of a magnetic field produced in a circumferential direction by the stator. ### Claim 4 (depends on 3) The motor according to claim 3, wherein the first and second stator magnetic barriers are constructed by one of a non-magnetic material and air. ### Claim 5 (depends on 1) The motor according to claim 1, wherein the rotor comprises a plurality of pole modules to produce a magnetic field and a magnetic member to concentrate the magnetic field. ### Claim 6 (depends on 5) The motor according to claim 5, wherein the plurality of pole modules is embedded in the magnetic member. ### Claim 7 (depends on 6) The motor according to claim 6, wherein the plurality of pole modules comprises a pair of permanent magnets magnetized in a circumferential direction of the rotor and a rotor magnetic barrier provided at an inner side of the pair of permanent magnets to connect the permanent magnets to each other. ### Claim 8 (depends on 7) The motor according to claim 7, wherein the permanent magnets are magnetized in different directions. ### Claim 9 (depends on 1) The motor according to claim 1, wherein the rotor comprises a plurality of permanent magnets to produce a magnetic field and a magnetic member to concentrate the magnetic field. ### Claim 10 (depends on 9) The motor according to claim 9, wherein the plurality of permanent magnets is magnetized in a circumferential direction of the rotor. ### Claim 11 (depends on 10) The motor according to claim 10, wherein the plurality of permanent magnets comprises a first permanent magnet magnetized in a clockwise direction of the rotor and a second permanent magnet magnetized in a counterclockwise direction of the rotor. ### Claim 12 (depends on 11) The motor according to claim 11, wherein the first permanent magnet and the second permanent magnet are alternately disposed along a circumference of the rotor. ### Claim 13 (depends on 1) The motor according to claim 1, wherein the rotor comprises a plurality of permanent magnet groups to produce a magnetic field and a magnetic member to concentrate the magnetic field. ### Claim 14 (depends on 13) The motor according to claim 13, wherein the plurality of permanent magnet groups comprises a first permanent magnet group provided with a permanent magnet magnetized in a radially outward direction of the rotor and a second permanent magnet group provided with a permanent magnet magnetized in a radially inward direction of the rotor. ### Claim 15 (depends on 14) The motor according to claim 14, wherein the first permanent magnet group and the second permanent magnet group are alternately disposed along a circumference of the rotor. ### Claim 16 A motor comprising: a stator including a stator body, teeth and a coil, where slots are formed between neighboring teeth; a rotor adapted to rotate through magnetic interaction with the stator, the rotor including a rotor core, a pole module, and a magnetic member; a shaft connected to the rotor; and stator magnetic barriers to interrupt magnetic flux produced by the coil, the stator magnetic barriers being provided near end surfaces of the teeth, wherein each of the teeth comprises only a single stator magnetic barrier, the single stator magnetic barrier being formed alternately on one side of the teeth in a clockwise direction and on an other side of the teeth in a counterclockwise direction for each of the teeth, respectively.