# US 10,770,959 B2 · Pole piece for a torque motor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,770,959 B2 - Document ID: US10770959B2 - Status: Granted - Kind: B2 - Application number: 16/124,790 - Filed: 2018-09-07 - Published: 2019-03-14 - Granted: 2020-09-08 - Earliest claimed: 2017-09-08 - Assignees: Hamilton Sunstrand Corporation - Applicants: Hamilton Sundstrand Corporation - Inventors: Michal Bieleń; Jakub Sobol - Web page: https://patentgrep.com/patent/US10770959B2 ## CPC - H02K 26/00: Machines adapted to function as torque motors, i.e. to exert a torque when stalled - H02K 1/08: Salient poles - H02K 1/17: Stator cores with permanent magnets - H02K 1/18: Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures - H02K 15/00: Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines - H02K 15/03: having permanent magnets - H02K 15/16: Centring rotors within the stators - F15B 13/0436: {the pilot valves being of the steerable jet type} - H02K 2201/03: Machines characterised by aspects of the air-gap between rotor and stator - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - F15B: SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR ## Abstract There is provided a pole-piece for a torque motor, the pole-piece comprising a first section formed separate from a second section, wherein the first section is held in position with respect to the second section using one or more rigid members. ## Claims ### Claim 1 A pole-piece for a torque motor, the pole-piece comprising: a first section; and a second section, formed separate from the first section; wherein the first section is held in position with respect to the second section using one or more rigid members; and wherein one or more abutment surfaces of the first section are configured to abut one or more abutment surfaces of the second section when the first section is held in position with respect to the second section using the one or more rigid members, and the abutment surfaces form one or more lines of abutment in an outer surface of the pole piece, wherein each rigid member extends through a line of abutment. ### Claim 2 (depends on 1) A pole-piece as claimed in claim 1, further comprising: one or more cavities in the pole-piece, wherein the one or more rigid members are located within said one or more cavities to hold the first section in position with respect to the second section. ### Claim 3 (depends on 2) A pole-piece as claimed in claim 2, wherein the one or more cavities comprise one or more holes extending from an opening in one of the first section and the second section through to the interior of the other of the first section and the second section, wherein a rigid member is inserted into each hole and extends through the hole between the first section and the second section. ### Claim 4 (depends on 2) A pole-piece as claimed in claim 2, wherein the one or more cavities are formed in an outer surface of the pole piece, each cavity extending from the first section to the second section, wherein a rigid member is inserted into each cavity and extends between the first section and the second section. ### Claim 5 (depends on 2) A pole-piece as claimed in claim 2, wherein the one or more cavities includes a pair of holes, a pair of cavities, or a pair that includes one hole and one cavity. ### Claim 6 (depends on 5) A pole-piece as claimed in claim 5, wherein the cavities of each of said pairs are located on opposed sides of a line (X) bisecting the pole piece. ### Claim 7 (depends on 6) A pole-piece as claimed in claim 6, wherein the cavities of each of said pairs are located symmetrically on opposed sides of the line (X) bisecting the pole piece. ### Claim 8 (depends on 1) A pole-piece as claimed in claim 1, wherein a longitudinal axis of each rigid member is at an angle (β) with respect to the line of abutment through which it extends. ### Claim 9 (depends on 8) A pole-piece as claimed in claim 8, wherein the angle (β) is less than 90 degrees, for example between 10-80 degrees. ### Claim 10 (depends on 1) A pole-piece as claimed in claim 1, wherein the one or more rigid members are disposed at an angle (α) with respect to each other. ### Claim 11 (depends on 10) A pole-piece as claimed in claim 10, wherein the angle (a) is between 30-150 degrees. ### Claim 12 A method of manufacturing a pole-piece for a torque motor, the method comprising: forming a pole-piece from a first section that is separate to and distinct from a second section; and holding the first section in position with respect to the second section using one or more rigid members; wherein the one or more rigid members are configured to hold the first section in an abutting relationship with the second section, such that one or more abutment surfaces of the first section are configured to abut one or more abutment surfaces of the second section when the first section is held in position with respect to the second section using the one or more rigid members. ### Claim 13 (depends on 12) A method as claimed in claim 12, further comprising: providing a single-piece of magnetic material; and cutting the single-piece of magnetic material along one or more lines to form the first section separate from the second section. ### Claim 14 (depends on 1) A pole-piece as claimed in claim 1, wherein the one or more rigid members comprises a pair of pins.