# US 2021/0344264 A1 · Motor and transmission > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0344264 A1 - Document ID: US20210344264A1 - Status: Published application - Kind: A1 - Application number: 17/375,178 - Filed: 2021-07-14 - Published: 2021-11-04 - Earliest claimed: 2017-01-04 - Assignees: LG Innotek Co., Ltd. - Applicants: LG Innotek Co., Ltd. - Inventors: Hyun Shik CHO; Hye Yeong Byeon - Web page: https://patentgrep.com/patent/US20210344264A1 ## CPC - H02K 29/03: with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems - F16H 3/091: including a single countershaft - G01R 33/02: Measuring direction or magnitude of magnetic fields or magnetic flux (G01R33/20 takes precedence) - H02K 1/146: {consisting of a generally annular yoke with salient poles} - H02K 1/2773: {consisting of tangentially magnetized radial magnets} - H02K 7/006: {Structural association of a motor or generator with the drive train of a motor vehicle} - H02K 7/085: {radially supporting the rotary shaft at only one end of the rotor (H02K7/086, H02K7/09 take precedence)} - H02K 7/108: with friction clutches - H02K 7/116: with gears - H02K 11/215: Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements - H02K 21/16: having annular armature cores with salient poles (with homopolar co-operation H02K21/20) - F16H 61/26: Generation or transmission of movements for final actuating mechanisms - H02K 21/14: with magnets rotating within the armatures - H02K 2201/03: Machines characterised by aspects of the air-gap between rotor and stator - 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}) - F16H: GEARING - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) ## Abstract A motor comprises: a shaft; a rotor coupled to the shaft and including a magnet; a stator disposed outside the rotor and including a coil and a stator core; a cover disposed on an upper side of the rotor; and a magnetic sensor disposed between the cover and the rotor, wherein the magnetic sensor is disposed on an upper side of the magnet, a surface of the magnetic sensor facing the rotor is disposed below the uppermost end of the coil, and the length of the rotor in the shaft direction is longer than the length of the stator core in the shaft direction. ## Claims ### Claim 1 A motor comprising: a shaft; a rotor coupled to the shaft and including a magnet; a stator disposed outside the rotor and including a coil and a stator core; a cover disposed on an upper side of the rotor; and a magnetic sensor disposed between the cover and the rotor, wherein the magnetic sensor is disposed above the magnet to sense a magnetic flux of the magnet, wherein a surface of the magnetic sensor facing the rotor is disposed below an uppermost end of the coil, and wherein an axial length of the rotor is longer than an axial length of the stator core. ### Claim 2 (depends on 1) The motor according to claim 1, comprising a bearing for supporting one end of the shaft, wherein the shaft includes a first outer circumferential surface in contact with the bearing and a second outer circumferential surface in contact with the rotor, and wherein a diameter of the first outer circumferential surface is smaller than a diameter of the second outer circumferential surface. ### Claim 3 (depends on 2) The motor according to claim 2, wherein a shortest distance between the magnetic sensor and the rotor is shorter than a shortest distance between the bearing and the rotor. ### Claim 4 (depends on 1) The motor according to claim 1, wherein the magnetic sensor overlaps the shaft in a direction perpendicular to a longitudinal direction of the shaft. ### Claim 5 (depends on 1) The motor according to claim 1, wherein the magnetic sensor is disposed to face the magnet in a direction of the rotation axis. ### Claim 6 (depends on 1) The motor according to claim 1, wherein the magnetic sensor is disposed between an inner diameter and an outer diameter of the magnet in a radial direction, and is axially spaced apart from the magnet and disposed on one side. ### Claim 7 (depends on 1) The motor according to claim 1, wherein the stator includes an insulator insulating the stator core and the coil, and the magnetic sensor is disposed between the insulator and the rotation shaft. ### Claim 8 (depends on 1) The motor according to claim 1, wherein the magnetic sensor is disposed between the stator and the shaft. ### Claim 9 (depends on 1) The motor according to claim 1, wherein an axial length of the rotor is greater than an axial length of the stator core. ### Claim 10 (depends on 2) The motor according to claim 2, wherein the bearing is disposed above the magnetic sensor. ### Claim 11 (depends on 2) The motor according to claim 2, comprising a circuit board on which the magnetic sensor is disposed, wherein the circuit board is coupled to the cover perpendicular to the rotation axis. ### Claim 12 (depends on 11) The motor according to claim 11, wherein a through hole through which the shaft passes is formed in the circuit board, and the circuit board is disposed radially outside the shaft. ### Claim 13 (depends on 11) The motor according to claim 11, wherein the circuit board is disposed between an inner diameter and an outer diameter of the magnet in a radial direction, and is axially spaced apart from the magnet and disposed on one side. ### Claim 14 (depends on 1) The motor according to claim 1, wherein the rotor and the rotation shaft are integrally formed ### Claim 15 (depends on 11) The motor according to claim 11, wherein a shortest distance between the circuit board and the rotor is shorter than a shortest distance between the bearing and the rotor. ### Claim 16 (depends on 1) The motor according to claim 1, wherein a shortest distance from the magnetic sensor to the rotor is 3 mm to 10 mm. ### Claim 17 (depends on 1) The motor according to claim 1, wherein the magnetic sensor is at least two or more. ### Claim 18 (depends on 17) The motor according to claim 17, wherein the magnetic sensor includes three, and the three magnetic sensors form an angle of 120 degrees to each other. ### Claim 19 A motor comprising: a housing; a stator is disposed inside the housing and has a coil wound thereon; a rotor rotatably disposed inside the stator and including a magnet in electromagnetic interaction with the coil; a shaft coupled to a central portion of the rotor and rotating together with the rotor; and a circuit board having a magnetic sensor arranged to be spaced apart from the stator and the rotor by a predetermined distance in the axial direction in an inner space of the housing and sensing a magnetic force of the magnet on one surface to detect a position of the rotor, wherein the axial length of the rotor is longer than the axial length of the stator. ### Claim 20 A transmission comprising: a gear actuator for shifting the gear through a plurality of motors for providing a driving force; a clutch actuator for selectively operating any one of the plurality of clutches; and a control unit for controlling the power module and the clutch actuator, wherein the motor comprises: a shaft; a rotor coupled to the shaft and including a magnet; a stator disposed outside the rotor and including a coil and a stator core; a cover disposed on an upper side of the rotor; and a magnetic sensor disposed between the cover and the rotor, wherein the magnetic sensor is disposed above the magnet to sense a magnetic flux of the magnet, wherein a surface of the magnetic sensor facing the rotor is disposed below an uppermost end of the coil, and wherein an axial length of the rotor is longer than an axial length of the stator core.