# US 10,320,358 B2 · Magnetically coupled contactless damper > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,320,358 B2 - Document ID: US10320358B2 - Status: Granted - Kind: B2 - Application number: 15/432,132 - Filed: 2017-02-14 - Published: 2018-08-16 - Granted: 2019-06-11 - Earliest claimed: 2017-02-14 - Assignees: Hamilton Sundstrand Corporation - Applicants: Hamilton Sundstrand Corporation - Inventors: Huazhen Chai; Eric A. Carter; John Huss - Web page: https://patentgrep.com/patent/US10320358B2 ## CPC - H03H 7/06: including resistors (H03H7/075, H03H7/09, H03H7/12, H03H7/13 take precedence) - H01F 17/062: {Toroidal core with turns of coil around it} - H01F 27/24: Magnetic cores - H01F 27/2823: {Wires (H01F27/2866 takes precedence)} - H02J 3/01: Arrangements for reducing harmonics or ripples - H03H 1/00: Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network (constructional details of electromechanical transducers H03H9/00) - H03H 3/00: Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators - H03H 7/427: {Common-mode filters (H02J3/01 and H02M1/126 takes precedence)} - H01F 38/48: {Common mode inductor for reducing or eliminating common mode noise on parallel lines} - H01F 2017/065: {Core mounted around conductor to absorb noise, e.g. EMI filter} - H03H 2001/0035: {Wound magnetic core} - H03H: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P) - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY ## Abstract According to an aspect, an inductor damper circuit includes a shared magnetic core, a primary winding, and a secondary winding. The primary winding includes an inductor winding of a first wire gauge wound about the shared magnetic core. The secondary winding includes a resistive damper winding of a second wire gauge that is less than the first wire gauge and wound about the shared magnetic core in contactless magnetic coupling with the primary winding. ## Claims ### Claim 1 An inductor damper circuit comprising: a shared magnetic core; a primary winding comprising an inductor winding of a first wire gauge wound about the shared magnetic core; and a secondary winding comprising a resistive damper winding of a second wire gauge that is less than the first wire gauge and wound about the shared magnetic core in contactless magnetic coupling with the primary winding, and the resistive damper winding comprises a resistive alloy that has a higher resistance characteristic per unit distance than the primary winding. ### Claim 2 (depends on 1) The inductor damper circuit of claim 1, wherein the shared magnetic core is a toroid. ### Claim 3 (depends on 2) The inductor damper circuit of claim 2, wherein the secondary winding is wrapped with an insulating material, and the primary winding is wrapped over the insulating material. ### Claim 4 (depends on 1) The inductor damper circuit of claim 1, wherein the primary winding is a copper winding. ### Claim 5 (depends on 1) The inductor damper circuit of claim 1, wherein the secondary winding comprises one or more electrically shorted windings comprising one or more turns. ### Claim 6 (depends on 5) The inductor damper circuit of claim 5, wherein the secondary winding comprises at least one bifilar turn to provide resistance trimming for the one or more turns of the secondary winding. ### Claim 7 (depends on 5) The inductor damper circuit of claim 5, wherein a number of the one or more turns is based on a turns ratio with respect to a number of turns of the primary winding and a targeted reflected resistance of the secondary winding at the primary winding to achieve a targeted frequency response of the damper filter. ### Claim 8 A power filtering circuit of a multi-phase electrical machine, the power filtering circuit comprising: a plurality of power phases, each of the power phases comprising a damper filter coupled to a power input and a power output, wherein the damper filter comprises an inductor damper circuit coupled to a capacitor, the inductor damper circuit comprising: a shared magnetic core; a primary winding comprising an inductor winding of a first wire gauge wound about the shared magnetic core; and a secondary winding comprising a resistive damper winding of a second wire gauge that is less than the first wire gauge and wound about the shared magnetic core in contactless magnetic coupling with the primary winding, and the resistive damper winding comprises a resistive alloy that has a higher resistance characteristic per unit distance than the primary winding. ### Claim 9 (depends on 8) The power filtering circuit of claim 8, wherein the shared magnetic core is a toroid, the secondary winding is wrapped with an insulating material, and the primary winding is a copper winding wrapped over the insulating material. ### Claim 10 (depends on 8) The power filtering circuit of claim 8, wherein the secondary winding comprises one or more electrically shorted windings comprising one or more turns. ### Claim 11 (depends on 10) The power filtering circuit of claim 10, wherein the secondary winding comprises at least one bifilar turn to provide resistance trimming for the one or more turns of the secondary winding. ### Claim 12 (depends on 10) The power filtering circuit of claim 10, wherein a number of the one or more turns is based on a turns ratio with respect to a number of turns of the primary winding and a targeted reflected resistance of the secondary winding at the primary winding to achieve a targeted frequency response of the damper filter. ### Claim 13 A method comprising: coupling an input lead of a primary winding of a damper filter to a power input; coupling an output lead of the primary winding of the damper filter to a power output; and establishing a contactless magnetic coupling between the primary winding and a secondary winding wound about a shared magnetic core of an inductor in the damper filter, wherein the primary winding comprises an inductor winding of a first wire gauge and the secondary winding comprises a resistive damper winding of a second wire gauge that is less than the first wire gauge and operable to provide electrical damping between the power input and the power output, and the resistive damper winding comprises a resistive alloy that has a higher resistance characteristic per unit distance than the primary winding. ### Claim 14 (depends on 13) The method of claim 13, wherein the shared magnetic core is a toroid. ### Claim 15 (depends on 14) The method of claim 14, wherein the secondary winding is wrapped with an insulating material, and the primary winding is wrapped over the insulating material. ### Claim 16 (depends on 13) The method of claim 13, wherein the primary winding is a copper winding. ### Claim 17 (depends on 13) The method of claim 13, wherein the secondary winding comprises one or more electrically shorted windings comprising one or more turns. ### Claim 18 (depends on 17) The method of claim 17, wherein the secondary winding comprises at least one bifilar turn to provide resistance trimming for the one or more turns of the secondary winding. ### Claim 19 (depends on 17) The method of claim 17, wherein a number of the one or more turns is based on a turns ratio with respect to a number of turns of the primary winding and a targeted reflected resistance of the secondary winding at the primary winding to achieve a targeted frequency response of the damper filter. ### Claim 20 (depends on 13) The method of claim 13, further comprising: coupling at least one instance of the damper filter to each of a plurality of power phases in a multi-phase electrical machine.