# US 2025/0146805 A1 · Inductive sensor system comprising inductive torque and position sensor assemblies > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0146805 A1 - Document ID: US20250146805A1 - Status: Published application - Kind: A1 - Application number: 18/930,897 - Filed: 2024-10-29 - Published: 2025-05-08 - Earliest claimed: 2023-11-06 - Assignees: Hl Mando Corporation - Applicants: Hl Mando Corporation - Inventors: Mohammad ISLAM; Md Sariful ISLAM - Web page: https://patentgrep.com/patent/US20250146805A1 ## CPC - G01B 7/30: for measuring angles or tapers; for testing the alignment of axes - B62D 6/10: characterised by means for sensing {or determining} torque - B62D 15/022: {on or near the connection between the steering wheel and steering column} - G01L 3/105: {involving inductive means (G01L3/102, G01L3/104 take precedence)} - G01L 5/221: {to steering wheels, e.g. for power assisted steering} - G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS - 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) - G01L: MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE (weighing G01G) ## Abstract An inductive sensor system may comprise an upper rotor comprising an upper target having a first metallic pattern; a lower rotor comprising a lower target having a second metallic pattern; and a stationary circuit board positioned between the upper rotor and the lower rotor. The circuit board comprises one or more transmitter coil sets configured to generate electromagnetic field, and one or more receiver coil sets for sensing relative angular displacement movement between the upper rotor and the lower rotor. The one or more transmitter coil sets and the one or more receiver coil sets are circularly wound. ## Claims ### Claim 1 An inductive sensor system comprising: an upper rotor comprising an upper target having a first metallic pattern; a lower rotor comprising a lower target having a second metallic pattern; and a stationary circuit board positioned between the upper rotor and the lower rotor, the circuit board comprising: one or more transmitter coil sets configured to generate electromagnetic field, one or more receiver coil sets for sensing relative angular displacement movement between the upper rotor and the lower rotor, wherein the one or more transmitter coil sets and the one or more receiver coil sets are circularly wound. ### Claim 2 (depends on 1) The inductive sensor system of claim 1, wherein: the one or more circularly wound receiver coil sets for sensing the relative angular displacement movement between the upper rotor and the lower rotor are positioned radially outside the first metallic pattern of the upper target and the second metallic pattern of the lower target, and the one or more circularly wound transmitter coil sets are positioned radially inside the first metallic pattern of the upper target and the second metallic pattern of the lower target. ### Claim 3 (depends on 1) The inductive sensor system of claim 1, wherein: the one or more circularly wound receiver coil sets for sensing the relative angular displacement movement between the upper rotor and the lower rotor are positioned radially inside the first metallic pattern of the upper target and the second metallic pattern of the lower target, and the one or more circularly wound transmitter coil sets are positioned radially inside the first metallic pattern of the upper target and the second metallic pattern of the lower target. ### Claim 4 (depends on 1) The inductive sensor system of claim 1, wherein: at least one of the one or more circularly wound receiver coil sets for sensing the relative angular displacement movement between the upper rotor and the lower rotor are positioned radially outside the first metallic pattern of the upper target and the second metallic pattern of the lower target, and another or other of the one or more circularly wound receiver coil sets for sensing the relative angular displacement movement between the upper rotor and the lower rotor are positioned radially inside the first metallic pattern of the upper target and the second metallic pattern of the lower target, and the one or more circularly wound transmitter coil sets are positioned radially inside the first metallic pattern of the upper target and the second metallic pattern of the lower target, respectively. ### Claim 5 (depends on 1) The inductive sensor system of claim 1, wherein the circuit board comprises an other upper receiver coil set for sensing an angular position of the upper rotor. ### Claim 6 (depends on 1) The inductive sensor system of claim 1, wherein the circuit board comprises an other lower receiver coil set for sensing an angular position of the lower rotor. ### Claim 7 (depends on 1) The inductive sensor system of claim 1, further comprising: an auxiliary rotor rotatably engaged with the upper rotor and having a third metallic pattern; and an auxiliary transmitter coil set and an auxiliary receiver coil set included in the circuit board or disposed on an upper surface of the circuit board. ### Claim 8 (depends on 1) The inductive sensor system of claim 1, further comprising: an auxiliary rotor rotatably engaged with the lower rotor and having a third metallic pattern; and an auxiliary transmitter coil set and an auxiliary receiver coil set included in the circuit board or disposed on an lower surface of the circuit board. ### Claim 9 (depends on 1) The inductive sensor system of claim 1, further comprising: an auxiliary rotor rotatably engaged with the upper or lower rotor and having magnetic material; and a sensor configured to sense magnetic field and positioned below or above the auxiliary rotor. ### Claim 10 (depends on 5) The inductive sensor system of claim 5, the upper receiver coil set and the other upper receiver coil set are disposed on an upper surface of the printed circuit board, the lower receiver coil and the other lower receiver coil set are disposed on a lower surface of the printed circuit board, and the one or more transmitter coil sets are disposed on the upper surface of the circuit board, the lower surface of the circuit board, or inside the circuit board. ### Claim 11 (depends on 5) The inductive sensor system of claim 5, the circuit board has multiple layers including upper layers and lower layers, the upper receiver coil set, and the other upper receiver coil set are disposed on or between the upper layers of the circuit board, the lower receiver coil set, and the other lower receiver coil set are disposed on or between the lower layers of the circuit board, and the one or more transmitter coil sets are disposed on the upper or lower surface of the circuit board or between the upper surface and the lower surface of the circuit board. ### Claim 12 (depends on 1) The inductive sensor system of claim 1, wherein the first metallic pattern of the first target and/or the second metallic pattern of the second target have a plurality of circumferentially adjacent lobes. ### Claim 13 (depends on 7) The inductive sensor system of claim 7, wherein the third metallic pattern of the auxiliary rotor has a substantially half circular or polygonal shape. ### Claim 14 (depends on 7) The inductive sensor system of claim 7, wherein the upper rotor and the auxiliary rotor have gear teeth to be engaged with each other. ### Claim 15 (depends on 8) The inductive sensor system of claim 8, wherein the lower rotor and the auxiliary rotor have gear teeth to be engaged with each other. ### Claim 16 (depends on 14) The inductive sensor system of claim 14, wherein a gear ratio between the upper rotor and the auxiliary rotor is around from 1.8 to 2.7. ### Claim 17 (depends on 1) The inductive sensor of claim 1, wherein: the upper rotor is comprised in or coupled to an upper shaft coupled to a steering wheel, the lower rotor is comprised in or coupled to a lower shaft, and a torsion bar is coupled between the upper shaft and the lower shaft. ### Claim 18 An inductive sensor system comprising: an upper rotor comprising an upper target having a first metallic pattern; a lower rotor comprising a lower target having a second metallic pattern; an auxiliary rotor rotatably engaged with the upper rotor or the lower rotor; and a stationary circuit board positioned between the upper rotor and the lower rotor, the circuit board comprising: one or more transmitter coil sets configured to generate electromagnetic field, one or more receiver coil sets for sensing relative angular displacement movement between the upper rotor and the lower rotor, and one or more receiver coil sets for sensing an angular position of the upper rotor and/or the lower rotor, wherein: the one or more transmitter coil sets and the one or more receiver coil sets for sensing the relative angular displacement movement between the upper rotor and the lower rotor are circularly wound. ### Claim 19 (depends on 18) The inductive sensor system of claim 18, wherein: the auxiliary rotor has a third metallic pattern, and an auxiliary transmitter coil set and an auxiliary receiver coil set included in the circuit board or disposed on a surface of the circuit board. ### Claim 20 (depends on 18) The inductive sensor system of claim 18, further comprising a sensor configured to sense magnetic field and positioned below or above the auxiliary rotor, wherein the auxiliary rotor rotatably engaged with the upper or lower rotor includes magnetic material.