# US 11,443,883 B2 · Reactor device

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- Number: US 11,443,883 B2
- Document ID: US11443883B2
- Status: Granted
- Kind: B2
- Application number: 16/768,903
- Filed: 2018-12-17
- Published: 2021-05-20
- Granted: 2022-09-13
- Earliest claimed: 2018-03-14
- Assignees: Panasonic Intellectual Property Management Co., Ltd.
- Applicants: Panasonic Intellectual Property Management Co., Ltd.
- Inventors: Takeshi Fujii; Ryosuke Usui; Chihiro Satou
- Web page: https://patentgrep.com/patent/US11443883B2

## CPC

- H01F 27/025: {Constructional details relating to cooling}
- H01F 27/22: Cooling by heat conduction through solid or powdered fillings
- H01F 27/24: Magnetic cores
- H01F 27/32: Insulating of coils, windings, or parts thereof
- H01F 37/00: Fixed inductances not covered by group H01F17/00
- H01F 41/12: Insulating of windings ({impregnating or encapsulating of transformers H01F41/005} ; of conductors in general H01B13/06)
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

A reactor device includes a coil, a magnetic core having the coil thereon, a case accommodating the coil and the magnetic core, a cooling plate fixed to the case, an insulating sheet disposed between the coil and the cooling plate, a compressible graphite sheet disposed between the coil and the cooling plate, and a screw to fix the cooling plate to the case. The case has a screw hole and an opening provided therein. The screw passes through the screw hole to fix the cooling plate to the case. The coil contacts the insulating sheet through the opening of the case. The graphite sheet contacts the cooling plate. The reactor has high cooling performance and reliability.

## Claims

### Claim 1

A reactor device comprising: a coil; a magnetic core having the coil provided thereon; a case accommodating the coil and the magnetic core therein, the case having a screw hole and an opening; a cooling plate fixed to the case; an insulating sheet disposed between the coil and the cooling plate; a graphite sheet disposed between the coil and the cooling plate, the graphite sheet being compressible; and a screw passing through the screw hole to fix the cooling plate to the case, wherein the coil contacts the insulating sheet through the opening of the case, and the graphite sheet contacts the cooling plate, wherein the graphite sheet has a compressibility equal to or larger than 50% upon having a pressure of 1 MPa applied to the graphite sheet.

### Claim 2 (depends on 1)

The reactor device according to claim 1, wherein the insulating sheet has a hardness equal to or larger than 2 and equal to or smaller than 25 under Japanese Industrial Standard (JIS) type-E.

### Claim 3 (depends on 1)

The reactor device according to claim 1, wherein a periphery of the graphite sheet is covered with the insulating sheet.

### Claim 4 (depends on 1)

The reactor device according to claim 1, wherein the insulating sheet contacts the graphite sheet.

### Claim 5 (depends on 1)

The reactor device according to claim 1, wherein
a surface of the coil includes a contact portion contacting the insulating sheet,
the contact portion of the coil includes a flat portion and a bent portion connected to the flat portion,
the insulating sheet has a larger area than the contact portion of the coil, and
the graphite sheet has a smaller area than the flat portion.

### Claim 6 (depends on 5)

The reactor device according to claim 5, wherein a part of the insulating sheet deforms along a shape of the contact portion of the coil.

### Claim 7 (depends on 5)

The reactor device according to claim 5, wherein the graphite sheet has a surface contacting the insulating sheet and facing the flat portion across the insulating sheet.

### Claim 8 (depends on 1)

The reactor device according to claim 1, wherein
a minimum thickness of the graphite sheet has a thickness and the insulating sheet has a thickness having a minimum thickness; and
a minimum thickness of the insulating sheet after the insulating sheet is tightened with the screw and is released from the tightening with the screw is equal to or smaller than five times a thickness of the graphite sheet after the insulating sheet is once tightened with the screw and is released from the tightening with the screw.

### Claim 9 (depends on 1)

The reactor device according to claim 1, wherein
the case includes a peripheral part surrounding the coil, and
the insulating sheet is sandwiched between the cooling plate and the peripheral part of the case.