# US 11,451,116 B2 · Motor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,451,116 B2 - Document ID: US11451116B2 - Status: Granted - Kind: B2 - Application number: 16/958,411 - Filed: 2018-12-19 - Published: 2021-02-25 - Granted: 2022-09-20 - Earliest claimed: 2017-12-27 - Assignees: LG Innotek Co., Ltd. - Applicants: LG Innotek Co., Ltd. - Inventors: Jae Young Kim; Kyung Sang Park; Young Hwan Jung - Web page: https://patentgrep.com/patent/US11451116B2 ## CPC - H02K 11/215: Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements - G01D 5/145: {influenced by the relative movement between the Hall device and magnetic fields (see G01R33/06)} - H02K 7/003: {Couplings; Details of shafts (means for mounting rotors on shafts H02K1/28)} - G01P 1/026: {for speed measuring devices, e.g. pulse generator} - G01P 3/487: delivered by rotating magnets - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - G01D: MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR - G01P: MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT (measuring or recording blood flow A61B5/02, A61B8/06; monitoring speed or deceleration of electrically-propelled vehicles B60L3/00; vehicle lighting systems adapted to indicate speed B60Q1/54; determining position or course in navigation, measuring ground distance in geodesy or surveying G01C; combined measuring devices for measuring two or more variables of movement G01C23/00; measuring velocity of sound G01H; measuring velocity of light G01J7/00; measuring direction or velocity of solid objects by reception or emission of radiowaves or other waves and based on propagation effects, e.g. Doppler effect, propagation time, direction of propagation, G01S; measuring speed of nuclear radiation G01T; measuring acceleration of gravity G01V; {measuring or recording the speed of trains B61L23/00; speed indicators incorporated in motor vehicles B60K35/00; measuring frequency or phase G01R; traffic control G08G}) ## Abstract An embodiment relates to a motor including a shaft, a rotor coupled to the shaft, a stator disposed outside the rotor, a sensing magnet disposed on the shaft, and a coupling member disposed to cover the sensing magnet, wherein the coupling member is inserted into a first groove concavely formed in an end portion of the shaft. Accordingly, combinability and assemblability of the sensing magnet and the shaft can be secured using the coupling member formed to have an elastic structure in the motor. ## Claims ### Claim 1 A motor comprising: a shaft including an end in which a first groove is concavely formed in a shaft direction; a rotor and a sensing magnet which are coupled to the shaft; a coupling member which couples the shaft and the sensing magnet; and an elastic member disposed under the sensing magnet, wherein the coupling member includes a coupling portion, which has an elastic force and of which at least a part is inserted into and coupled to the first groove, and an accommodation portion fixing the sensing magnet, wherein the shaft includes a third groove concavely formed in the shaft direction of a lower surface of the first groove, and one lower region of the elastic member is disposed in the third groove. ### Claim 2 (depends on 1) The motor of claim 1, wherein: a plurality of coupling portions are formed as the coupling portion of the coupling member on a lower end of the accommodation portion; and each of the plurality of coupling portions includes a first region formed to protrude downward from an end portion of the accommodation portion and a second region obliquely bent upward from a lower portion of the first region. ### Claim 3 (depends on 2) The motor of claim 2, wherein: the coupling portion further includes a third region bent outward from an end portion of the second region; the shaft includes an inner circumferential surface and a lower surface which form the first groove; the shaft includes a second groove concavely formed in the inner circumferential surface; and an end portion of the third region is disposed in the second groove. ### Claim 4 (depends on 1) The motor of claim 1, wherein: the coupling portion is press-fitted into and coupled to the first groove; and the accommodation portion is disposed on a side surface of the coupling portion. ### Claim 5 (depends on 4) The motor of claim 4, wherein: the coupling member includes a body having a cylindrical shape; the accommodation portion includes an upper surface portion extending from an upper end of the body in a radius direction and a side surface portion extending downward from an edge of the upper surface portion; the sensing magnet is formed to have a donut shape and includes a groove; and a part of the body is disposed in the groove of the sensing magnet. ### Claim 6 (depends on 5) The motor of claim 5, wherein: an outer circumferential surface of the body is in contact with an inner circumferential surface of the sensing magnet; an inner surface of the upper surface portion is in contact with an upper surface of the sensing magnet; and an inner surface of the side surface portion is in contact with an outer circumferential surface of the sensing magnet. ### Claim 7 (depends on 6) The motor of claim 6, wherein: the upper surface portion includes a plurality of bent portions; a height of the upper surface portion disposed between the bent portions is less than a height of the upper surface portion disposed outside the bent portion; and the upper surface portion in contact with the upper surface of the sensing magnet is formed between the bent portions. ### Claim 8 (depends on 7) The motor of claim 7, wherein the upper surface portion disposed outside the bent portion is spaced apart from the upper surface of the sensing magnet so that an additional space is formed. ### Claim 9 (depends on 4) The motor of claim 4, wherein: the sensing magnet includes inclined surfaces; and the inclined surfaces are disposed on a boundary between an upper surface and an inner circumferential surface of the sensing magnet and disposed on a boundary between a lower surface and the inner circumferential surface of the sensing magnet. ### Claim 10 A motor comprising: a shaft including an end in which a first groove is formed; a rotor and a sensing magnet which are coupled to the shaft; a coupling member which couples the shaft and the sensing magnet; and an elastic member disposed under the sensing magnet, wherein the coupling member includes a coupling portion, which has an elastic force and of which at least a part is inserted into and coupled to the first groove, and an accommodation portion fixing the sensing magnet, wherein the shaft includes a third groove concavely formed in a lower surface and one lower region of the elastic member is disposed in the third groove, wherein a plurality of coupling portions are formed as the coupling portion of the coupling member on a lower end of the accommodation portion; and each of the plurality of coupling portions includes a first region formed to protrude downward from an end portion of the accommodation portion and a second region obliquely bent upward from a lower portion of the first region. ### Claim 11 (depends on 10) The motor of claim 10, wherein: the coupling portion further includes a third region bent outward from an end portion of the second region; the shaft includes an inner circumferential surface and a lower surface which form the first groove; the shaft includes a second groove concavely formed in the inner circumferential surface; and an end portion of the third region is disposed in the second groove. ### Claim 12 A motor comprising: a shaft including an end in which a first groove is formed; a rotor and a sensing magnet which are coupled to the shaft; a coupling member which couples the shaft and the sensing magnet; and an elastic member disposed under the sensing magnet, wherein the coupling member includes a coupling portion, which has an elastic force and of which at least a part is inserted into and coupled to the first groove, and an accommodation portion fixing the sensing magnet, wherein the shaft includes a third groove concavely formed in a lower surface and one lower region of the elastic member is disposed in the third groove, wherein: the coupling portion is press-fitted into and coupled to the first groove; and the accommodation portion is disposed on a side surface of the coupling portion, the coupling member includes a body having a cylindrical shape; the accommodation portion includes an upper surface portion extending from an upper end of the body in a radius direction and a side surface portion extending downward from an edge of the upper surface portion; the sensing magnet is formed to have a donut shape and includes a groove; and a part of the body is disposed in the groove of the sensing magnet. ### Claim 13 (depends on 12) The motor of claim 12, wherein: an outer circumferential surface of the body is in contact with an inner circumferential surface of the sensing magnet; an inner surface of the upper surface portion is in contact with an upper surface of the sensing magnet; and an inner surface of the side surface portion is in contact with an outer circumferential surface of the sensing magnet. ### Claim 14 (depends on 13) The motor of claim 13, wherein: the upper surface portion includes a plurality of bent portions; a height of the upper surface portion disposed between the bent portions is less than a height of the upper surface portion disposed outside the bent portion; and the upper surface portion in contact with the upper surface of the sensing magnet is formed between the bent portions. ### Claim 15 (depends on 14) The motor of claim 14, wherein the upper surface portion disposed outside the bent portion is spaced apart from the upper surface of the sensing magnet so that an additional space is formed. ### Claim 16 (depends on 12) The motor of claim 12, wherein: the sensing magnet includes inclined surfaces; and the inclined surfaces are disposed on a boundary between an upper surface and an inner circumferential surface of the sensing magnet and disposed on a boundary between a lower surface and the inner circumferential surface of the sensing magnet.