# US 10,373,753 B2 · Multi-phase reactor capable of obtaining constant inductance for each phase > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,373,753 B2 - Document ID: US10373753B2 - Status: Granted - Kind: B2 - Application number: 15/354,022 - Filed: 2016-11-17 - Published: 2017-06-01 - Granted: 2019-08-06 - Earliest claimed: 2015-11-30 - Assignees: Fanuc Corporation - Applicants: Fanuc Corporation - Inventors: Takuya Maeda; Masatomo Shirouzu - Web page: https://patentgrep.com/patent/US10373753B2 ## CPC - H01F 17/062: {Toroidal core with turns of coil around it} - H01F 3/14: Constrictions; Gaps, e.g. air-gaps (in magnetic shunt paths H01F3/12) - H01F 37/00: Fixed inductances not covered by group H01F17/00 - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract A multi-phase reactor is configured to include a first core arranged at a center of the reactor; a plurality of second cores provided outside the first core and arranged so that each of magnetic paths with respect to the first core is in a loop shape; and one or a plurality of windings wound around each of the second cores. With this configuration, the multi-phase reactor capable of setting a constant value of inductance for each phase is provided. ## Claims ### Claim 1 A multi-phase reactor comprising: a first core arranged at a center of the reactor; a plurality of second cores provided outside the first core and arranged so that each of magnetic paths with respect to the first core is in a loop shape; and one or a plurality of windings wound around each of the second cores, wherein each of the second cores includes two end portions opposite to the outside of the first core, the two end portions being located at different positions along the outside of the first core without contact between the two end portions and the outside of the first core. ### Claim 2 (depends on 1) The multi-phase reactor according to claim 1, wherein the second cores have an identical shape. ### Claim 3 (depends on 1) The multi-phase reactor according to claim 1, wherein the second cores are arranged around the first core in rotational symmetry with respect to a center of the first core. ### Claim 4 (depends on 1) The multi-phase reactor according to claim 1, wherein predetermined gaps are provided between outside of the first core and the second cores. ### Claim 5 (depends on 1) The multi-phase reactor according to claim 1, further comprising a gap member provided between outside of the first core and the second cores and having a predetermined thickness. ### Claim 6 (depends on 1) The multi-phase reactor according to claim 1, wherein each of the second cores is formed integrally including two radial legs each having one end facing outside of the first core and extending radially, and a peripheral portion connecting other ends of the two radial legs, and each of the windings is wound around a corresponding one of the radial legs. ### Claim 7 (depends on 6) The multi-phase reactor according to claim 6, wherein the outside of the first core has a circular shape corresponding to a shape at the one end of each of the radial legs of the plurality of second cores. ### Claim 8 (depends on 6) The multi-phase reactor according to claim 6, wherein the outside of the first core has a polygonal shape corresponding to a shape at the one end of each of the radial legs of the plurality of second cores. ### Claim 9 (depends on 6) The multi-phase reactor according to claim 6, further comprising core fixing members respectively provided between the peripheral portions of adjacent two of the second cores. ### Claim 10 (depends on 9) The multi-phase reactor according to claim 9, wherein the core fixing members are made of a quality of a material different from that of the plurality of second cores. ### Claim 11 (depends on 9) The multi-phase reactor according to claim 9, wherein the core fixing members are formed integrally with the plurality of second cores with an identical quality of a material. ### Claim 12 (depends on 9) The multi-phase reactor according to claim 9, wherein the core fixing members and the peripheral portions of the second cores are formed as a circular shape. ### Claim 13 (depends on 9) The multi-phase reactor according to claim 9, wherein the core fixing members are used for assembling or fixing the multi-phase reactor. ### Claim 14 (depends on 13) The multi-phase reactor according to claim 13, wherein each of the core fixing members includes a predetermined hole. ### Claim 15 (depends on 1) The multi-phase reactor according to claim 1, wherein the multi-phase reactor is a three-phase reactor to which a three-phase alternating current is applied. ### Claim 16 (depends on 15) The multi-phase reactor according to claim 15, wherein the plurality of second cores of an integral multiple of three are provided, and the windings wound around the second cores of the integral multiple of three are sorted into three.