# US 12,119,155 B2 · Reactor

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- Number: US 12,119,155 B2
- Document ID: US12119155B2
- Status: Granted
- Kind: B2
- Application number: 16/960,360
- Filed: 2019-03-06
- Published: 2021-03-04
- Granted: 2024-10-15
- Earliest claimed: 2018-03-15
- Assignees: Mitsubishi Electric Corporation
- Applicants: Mitsubishi Electric Corporation
- Inventors: Tomohito Fukuda; Takashi Kumagai; Hideo Noda; Kazuyuki Shibata; Masanori Kageyama
- Web page: https://patentgrep.com/patent/US12119155B2

## CPC

- H01F 27/025: {Constructional details relating to cooling}
- H01F 27/22: Cooling by heat conduction through solid or powdered fillings
- H01F 3/14: Constrictions; Gaps, e.g. air-gaps (in magnetic shunt paths H01F3/12)
- H01F 17/062: {Toroidal core with turns of coil around it}
- H01F 27/08: Cooling (heat-transfer elements F28F); Ventilating (structural details of casings H01F27/02)
- H01F 27/24: Magnetic cores
- H01F 27/28: Coils; Windings; Conductive connections
- H01F 37/00: Fixed inductances not covered by group H01F17/00
- H01F 41/0206: {Manufacturing of magnetic cores by mechanical means (magnetic cores per se H01F27/24)}
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

The present invention has an object of providing a reactor including cores with higher heat dissipation and a coil with less eddy-current loss. A reactor according to the present invention includes: a plurality of divided cores having a shape obtained by dividing an annular core in a circumferential direction, the divided cores being made of a soft magnetic material; a core gap part disposed between the divided cores in the annular core formed by combining the plurality of divided cores, the core gap part being made of a non-magnetic material; annular heat-dissipating cases that house the divided cores and the core gap part; and a coil wound around the heat-dissipating cases, wherein the heat-dissipating cases are made of a material whose thermal conductivity is as high as 100 W/(m·K) or more.

## Claims

### Claim 1

A reactor, comprising:
a plurality of divided cores having a shape obtained by dividing an annular core in a circumferential direction, the divided cores being made of a soft magnetic material;
a core gap part disposed between the divided cores in the annular core formed by combining the plurality of divided cores, the core gap part being made of a non-magnetic material;
an annular heat-dissipating case that houses the divided cores and the core gap part; and
a coil wound around the heat-dissipating case,
wherein,
one end surface of the heat-dissipating case is an open end surface,
the heat-dissipating case includes cutout portions on edges of an outer circumferential surface and an inner circumferential surface that are in contact with the open end surface,
the coil is wound along the cutout portions, and
the cutout portions in the heat-dissipating case are disposed distant from the core gap part so that the coil wound along the cutout portions is disposed only in a region overlapping the divided cores.

### Claim 2 (depends on 1)

The reactor according to claim 1,
wherein the heat-dissipating case includes protrusions protruding from an edge of an outer circumferential surface that is in contact with the open end surface, and
the protrusions are fixed to a cooler disposed on the open end surface of the heat-dissipating case.