# US 11,114,928 B2 · Torque motor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,114,928 B2 - Document ID: US11114928B2 - Status: Granted - Kind: B2 - Application number: 16/516,472 - Filed: 2019-07-19 - Published: 2020-01-23 - Granted: 2021-09-07 - Earliest claimed: 2018-07-20 - Assignees: Hamilton Sundstrand Corporation - Applicants: Hamilton Sundstrand Corporation - Inventors: Wojciech Pluciński - Web page: https://patentgrep.com/patent/US11114928B2 ## CPC - H02K 26/00: Machines adapted to function as torque motors, i.e. to exert a torque when stalled - F15B 13/044: operated by electrically-controlled means, e.g. solenoids, torque-motors - F16K 31/042: {with electric means, e.g. for controlling the motor or a clutch between the valve and the motor} - F16K 31/082: {using a electromagnet and a permanent magnet} - F15B 13/043: with electrically-controlled pilot valves - 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 - F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)} ## Abstract A pole piece for a torque motor includes two separate arcuate members and first and second diametrically opposed attachment portions formed as a single piece of material. Each arcuate member extends in opposite directions from the first attachment portion and following a generally circular path defining a perimeter of the pole piece and meeting each other at the second attachment portion. The arcuate members are devoid of any holes or apertures. ## Claims ### Claim 1 The method of constructing a torque motor, comprising: providing at least one pole piece formed from a single piece of material and at least partially by two arcuate members extending in opposite directions from a first attachment portion of the pole piece and following a generally circular path defining a perimeter of the pole piece, wherein a cross-section of the arcuate members are devoid of any holes or apertures and meet each other at a second attachment portion diametrically opposed from the first attachment portions of the pole piece, a top surface and a bottom surface of each arcuate member extends vertically and circumferentially away from the first attachment portion. ### Claim 2 (depends on 1) The method as claimed in claim 1, wherein the arcuate members have a substantially constant cross-sectional area along the generally circular path. ### Claim 3 (depends on 1) The method as claimed in claim 1, further comprising: providing a lower pole piece and an upper pole piece, wherein at least one of the lower pole piece and the upper pole piece consists of the at least one pole piece; and providing one or more permanent magnets extending between the lower pole piece and the upper pole piece, wherein the permanent magnets are configured to support the upper pole piece in use. ### Claim 4 A pole piece for a torque motor, wherein the pole piece is a single piece of material formed at least partially by two separate arcuate members, each extending in opposite directions from a first attachment portion of the pole piece and following a generally circular path defining a perimeter of the pole piece, wherein a cross-section of the arcuate members are devoid of any holes or apertures and meet each other at a second attachment portion diametrically opposed from the first attachment portions, of the pole piece, a top surface and a bottom surface of each arcuate member extends vertically and circumferentially away from the first attachment portion. ### Claim 5 (depends on 4) The pole piece as claimed in claim 4, wherein the arcuate members have a substantially constant cross-sectional area along the generally circular path. ### Claim 6 (depends on 4) The pole piece as claimed in claim 4, wherein the arcuate members comprise a square cross-section along the generally circular path. ### Claim 7 (depends on 4) The pole piece as claimed in claim 4, wherein the arcuate members are symmetrically opposed to each other. ### Claim 8 (depends on 4) The pole piece as claimed in claim 4, wherein the first and second attachment portions each comprises a block of material from which each arcuate member extends. ### Claim 9 (depends on 4) The pole piece as claimed in claim 4, wherein an outer circumferential surface of the pole piece has a generally cylindrical profile. ### Claim 10 An apparatus for a torque motor, comprising: a lower pole piece; an upper pole piece; and one or more permanent magnets extending between the lower pole piece and the upper pole piece, wherein the permanent magnets are configured to support the upper pole piece in use; wherein each of the lower pole piece and the upper pole piece is a pole piece is a single piece of material formed at least partially by two separate arcuate members, each extending in opposite directions from a first attachment portion of the pole piece and following a generally circular path defining a perimeter of the pole piece, wherein a cross-section of the arcuate members are devoid of any holes or apertures and meet each other at a second attachment portion diametrically opposed from the first attachment portions of the pole piece, a top surface and a bottom surface of each arcuate member extends vertically and circumferentially away from the first attachment portion. ### Claim 11 (depends on 10) The apparatus as claimed in claim 10, wherein the arcuate members have a substantially constant cross-sectional area along the generally circular path. ### Claim 12 (depends on 10) The apparatus as claimed in claim 10, wherein the upper pole piece is supported solely by the permanent magnets in use. ### Claim 13 (depends on 10) The apparatus a claimed in claim 10, in combination with an armature located between the lower pole piece and the upper pole piece to form a torque motor. ### Claim 14 (depends on 13) The apparatus as claimed in claim 13, wherein the armature extends along a longitudinal axis (A), and comprises opposed surfaces located at opposed ends of the armature along the longitudinal axis (A) thereof, wherein the opposed surfaces follow a curved profile corresponding to a curved profile of the lower pole piece and the upper pole piece. ### Claim 15 (depends on 13) The apparatus of claim 13, wherein the apparatus is in a servovalve. ### Claim 16 (depends on 10) The apparatus a claimed in claim 10, wherein the arcuate members comprise a square cross-section along the generally circular path. ### Claim 17 (depends on 10) The apparatus a claimed in claim 10, wherein the arcuate members are symmetrically opposed to each other. ### Claim 18 (depends on 10) The apparatus a claimed in claim 10, wherein each arcuate member extends vertically and circumferentially away from the first attachment portion. ### Claim 19 (depends on 10) The apparatus a claimed in claim 10, wherein an outer circumferential surface of the pole piece has a generally cylindrical profile.