# US 2018/0024018 A1 · Rotor, and torque sensor and electronic power steering system including the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0024018 A1 - Document ID: US20180024018A1 - Status: Published application - Kind: A1 - Application number: 15/722,847 - Filed: 2017-10-02 - Published: 2018-01-25 - Earliest claimed: 2015-08-20 - Assignees: LG Innotek Co., Ltd. - Applicants: LG Innotek Co., Ltd. - Inventors: Chang Hwan LEE - Web page: https://patentgrep.com/patent/US20180024018A1 ## CPC - G01L 3/101: {involving magnetic or electromagnetic means} - B62D 5/0403: {characterised by constructional features, e.g. common housing for motor and gear box} - B62D 6/10: characterised by means for sensing {or determining} torque - H02K 15/03: having permanent magnets - G01L 3/04: wherein the torque-transmitting element comprises a torsionally-flexible shaft - G01L 3/10: involving electric or magnetic means for indicating - G01L 3/104: {involving permanent magnets} - G01L 5/221: {to steering wheels, e.g. for power assisted steering} - G01L 25/003: {for measuring torque} - G01L: MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE (weighing G01G) - B62D: MOTOR VEHICLES; TRAILERS (steering, or guiding on a desired track, of agricultural machines or implements A01B69/00; wheels, castors, axles, increasing wheel adhesion B60B; vehicle tyres, tyre inflation or tyre changing B60C; connections between vehicles of a train or the like B60D; vehicles for use on rail and road, amphibious or convertible vehicles B60F; suspension arrangements B60G; heating, cooling, ventilating or other air treating devices B60H; windows, windscreens, non-fixed roofs, doors or similar devices, protective coverings for vehicles not in use B60J; propulsion plant arrangements, auxiliary drives, transmissions, controls, instrumentation or dashboards B60K; electric equipment or propulsion of electrically-propelled vehicles B60L; power supply for electrically-propelled vehicles B60M; passenger accommodation not otherwise provided for B60N; adaptations for load transportation or to carry special loads or objects B60P; arrangement of signalling or lighting devices, the mounting or supporting thereof or circuits therefor, for vehicles in general B60Q; vehicles, vehicle fittings or vehicle parts not otherwise provided for B60R; servicing, cleaning, repairing, supporting, lifting, or manoeuvring, not otherwise provided for, B60S; brake arrangements, brake control systems or parts thereof B60T; air-cushion vehicles B60V; motor-cycles, accessories therefor B62J, B62K; testing of vehicles G01M) - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) ## Abstract The present invention relates to a rotor including a shaft sleeve having a shaft sleeve main body and a stopper formed to protrude outward from an end portion of the shaft sleeve main body; a magnet disposed on an outer circumferential surface of the shaft sleeve and a lower portion thereof is supported by the stopper; and a fixing part which fixes an upper portion of the magnet, and a torque sensor and an electronic power steering system including the same. Due to the above structure, a broken magnet is prevented from deviating even when a magnet is broken. ## Claims ### Claim 1 A rotor comprising: a shaft sleeve; a magnet disposed on an outer circumferential surface of the shaft sleeve; and a fixing member disposed in a groove formed in the magnet, wherein the shaft sleeve comprises a shaft sleeve main body and a first protrusion part protruded outward from an end portion of the shaft sleeve main body, and wherein a lower portion of the magnet is in contact with the first protrusion part. ### Claim 2 (depends on 1) The rotor of claim 1, wherein the fixing member is provided with a first bonding layer formed by filling the groove formed in an inner side of the magnet with an adhesive, and the groove is formed in the inner side of the magnet along a circumferential direction thereof. ### Claim 3 (depends on 1) The rotor of claim 1, wherein the fixing member is formed in a ring-shape, and the fixing member is coupled to the groove formed in the upper portion of the magnet. ### Claim 4 (depends on 1) The rotor of claim 1, wherein a concave-convex part is formed on an upper surface of the magnet. ### Claim 5 (depends on 4) The rotor of claim 4, wherein a plurality of the concave-convex parts are disposed along a circumferential direction of the upper surface of the magnet. ### Claim 6 (depends on 5) The rotor of claim 5, wherein the concave-convex part is formed in a wedge shape. ### Claim 7 (depends on 1) The rotor of claim 1, wherein a protrusion formed to protrude from the lower portion of the magnet is coupled to a key groove formed by incising one section of the stopper. ### Claim 8 (depends on 1) The rotor of claim 1, wherein a protrusion formed to protrude from the first protrusion part is coupled to a key groove formed in the lower portion of the magnet. ### Claim 9 (depends on 1) The rotor of claim 1, wherein the first protrusion part is formed to protrude along the end portion of the sleeve shaft main body. ### Claim 10 (depends on 9) The rotor of claim 9, wherein an end portion of the first protrusion part is bent in a direction opposite a direction in which the magnet is inserted. ### Claim 11 (depends on 10) The rotor of claim 10, wherein a second protrusion part formed to protrude from the lower portion of the magnet is coupled to a first groove formed by forming the first protrusion part to be bent. ### Claim 12 (depends on 1) The rotor of claim 1, further comprising a second bonding layer formed between an outer circumferential surface of the shaft sleeve main body and an inner circumferential surface of the magnet. ### Claim 13 A torque sensor comprising: a housing; a stator disposed inside the housing; and a rotor disposed inside the stator, wherein the rotor comprises: a shaft sleeve; a magnet disposed on an outer circumferential surface of the shaft sleeve; and a fixing member disposed in a groove formed in the magnet, wherein the shaft sleeve comprises: a shaft sleeve main body and a first protrusion part protruded outward from an end portion of the shaft sleeve main body, and wherein a lower portion of the magnet is in contact with the first protrusion part. ### Claim 14 (depends on 13) The torque sensor of claim 13, wherein a concave-convex part is formed on an upper surface of the magnet. ### Claim 15 (depends on 14) The torque sensor of claim 14, wherein a central point of the rotor is adjusted by a jig which comes into contact with the concave-convex part. ### Claim 16 (depends on 13) The torque sensor of claim 13, wherein the fixing member is provided with a first bonding layer formed by filling the groove formed in an inner side of the magnet with an adhesive, and the groove is formed in the inner side of the magnet along a circumferential direction thereof. ### Claim 17 (depends on 13) The torque sensor of claim 13, wherein the fixing member is formed in a ring-shape, and the fixing member is coupled to the groove formed in the upper portion of the magnet. ### Claim 18 An electronic power steering system comprising: a steering shaft; and a torque sensor, wherein the torque sensor comprises: a housing; a stator disposed inside the housing; and a rotor disposed inside the stator, wherein the rotor comprises: a shaft sleeve; a magnet disposed on an outer circumferential surface of the shaft sleeve; and a fixing member disposed in a groove formed in the magnet, wherein the shaft sleeve comprises: a shaft sleeve main body and a first protrusion part protruded outward from an end portion of the shaft sleeve main body, wherein a lower portion of the magnet is in contact with the first protrusion part, and wherein the shaft sleeve of the rotor is connected to the steering shaft. ### Claim 19 (depends on 18) The electronic power steering system of claim 18, wherein a concave-convex part is formed on an upper surface of the magnet. ### Claim 20 (depends on 19) The electronic power steering system of claim 19, wherein a central point of the rotor is adjusted by a jig which comes into contact with the concave-convex part.