# US 2020/0005986 A1 · Reactor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0005986 A1 - Document ID: US20200005986A1 - Status: Published application - Kind: A1 - Application number: 16/483,168 - Filed: 2018-01-29 - Published: 2020-01-02 - Earliest claimed: 2017-02-15 - Assignees: Autonetworks Technologies, Ltd.; Sumitomo Wiring Systems, Ltd.; Sumitomo Electric Industries, Ltd. - Applicants: AutoNetworks Technologies, Ltd.; Sumitomo Wiring Systems, Ltd.; Sumitomo Electric Industries, Ltd. - Inventors: Kazuhiro Inaba; Kouji Nishi; Kouhei Yoshikawa - Web page: https://patentgrep.com/patent/US20200005986A1 ## CPC - H01F 27/255: made from particles (H01F27/26 takes precedence) - H01F 3/10: Composite arrangements of magnetic circuits - H01F 37/00: Fixed inductances not covered by group H01F17/00 - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract A reactor includes: a coil including a first winding portion and a second winding portion formed by winding a winding wire, such that axes of the winding portions are parallel; and a magnetic core including: a first inner core portion arranged in the first winding portion; a second inner core portion arranged in the second winding portion; and outer core portions that are arranged outside of the winding portions and couple both inner core portions. A specification of a constituent material of the first inner core portion and a specification of a constituent material of the second inner core portion are different, and the second inner core portion is configured such that alternating-current loss of the second inner core portion and the second winding portion is smaller than alternating-current loss of the first inner core portion and the first winding portion. ## Claims ### Claim 1 A reactor comprising: a coil including a first winding portion and a second winding portion formed by winding a winding wire, such that axes of the winding portions are parallel; and a magnetic core including: a first inner core portion arranged in the first winding portion; a second inner core portion arranged in the second winding portion; and outer core portions that are arranged outside of the winding portions and couple both inner core portions, wherein a specification of a constituent material of the first inner core portion and a specification of a constituent material of the second inner core portion are different, and the second inner core portion is configured such that alternating-current loss of the second inner core portion and the second winding portion is smaller than alternating-current loss of the first inner core portion and the first winding portion. ### Claim 2 (depends on 1) The reactor according to claim 1, wherein a magnetic material included in the first inner core portion is a material with a higher saturation magnetic flux density than a magnetic material included in the second inner core portion. ### Claim 3 (depends on 2) The reactor according to claim 2, wherein a magnetic path cross-sectional area of the first inner core portion is smaller than a magnetic path cross-sectional area of the second inner core portion. ### Claim 4 (depends on 1) The reactor according to claim 1, wherein the first inner core portion includes a core piece composed of a pressed powder molded body, and the second inner core portion includes a core piece composed of a molded body of a composite material including a magnetic powder and a resin. ### Claim 5 (depends on 2) The reactor according to claim 2, wherein the first inner core portion and the second inner core portion both include a core piece composed of a pressed powder molded body or a core piece composed of a molded body of a composite material including a magnetic powder and a resin. ### Claim 6 (depends on 1) The reactor according to claim 1, wherein the first inner core portion and the second inner core portion both include a core piece composed of a molded body of a composite material including a resin and a magnetic powder of the same type, and the magnetic powder included in the second inner core portion has a smaller average particle diameter than the magnetic powder included in the first inner core portion. ### Claim 7 (depends on 2) The reactor according to claim 2, wherein the first inner core portion includes a core piece composed of a pressed powder molded body, and the second inner core portion includes a core piece composed of a molded body of a composite material including a magnetic powder and a resin. ### Claim 8 (depends on 3) The reactor according to claim 3, wherein the first inner core portion includes a core piece composed of a pressed powder molded body, and the second inner core portion includes a core piece composed of a molded body of a composite material including a magnetic powder and a resin. ### Claim 9 (depends on 3) The reactor according to claim 3, wherein the first inner core portion and the second inner core portion both include a core piece composed of a pressed powder molded body or a core piece composed of a molded body of a composite material including a magnetic powder and a resin. ### Claim 10 (depends on 2) The reactor according to claim 2, wherein the first inner core portion and the second inner core portion both include a core piece composed of a molded body of a composite material including a resin and a magnetic powder of the same type, and the magnetic powder included in the second inner core portion has a smaller average particle diameter than the magnetic powder included in the first inner core portion. ### Claim 11 (depends on 3) The reactor according to claim 3, wherein the first inner core portion and the second inner core portion both include a core piece composed of a molded body of a composite material including a resin and a magnetic powder of the same type, and the magnetic powder included in the second inner core portion has a smaller average particle diameter than the magnetic powder included in the first inner core portion.