Reactor, converter, and power conversion device

Patent metadata

Field	Value
Publication number	US-2023377790-A1
Application number	US-202118024704-A
Country	US
Kind code	A1
Filing date	Aug 2, 2021
Priority date	Sep 8, 2020
Publication date	Nov 23, 2023
Grant date	—

Abstract

In this reactor: a coil has a winding part; a magnetic core has a middle-core part, two side-core parts, and two end-core parts; the middle-core part has a portion disposed at the inner side of the winding part; the two side-core parts are disposed side by side with the middlecore part at the outer sides of the winding part; and the two end-core parts are respectively disposed at the outer sides of the ends of the winding part so as to connect the middle-core part and the two side-core parts. The magnetic core has a first region and a second region having a relative permeability higher than that of the first region. The first region has two corners formed from the middle-core part and the two end-core parts. The second region includes a base-end region and a projecting region. The base-end region extends in the two end-core parts so as to straddle over the axial line of the middle-core part and extends along the direction in which the middle-core part and the two side-core parts are arranged side by side, whereas the projecting region projects from the base-end region to the middle-core part.

First claim

1 . A reactor, comprising:
a coil: and a magnetic core, the coil including one winding portion, the magnetic core including a middle core part, two side core parts and two end core parts, the middle core part having a part to be arranged inside the winding portion, each of the two side core parts being arranged side by side with the middle core part outside the winding portion, each of the two end core parts being arranged to connect the middle core part and the two side core parts outside end parts of the winding portions, the magnetic core having a first region and a second region having a higher relative magnetic permeability than the first region, the first region including two corner parts constituted by the middle core part and each of the two end core parts, the second region including a base end region and a projecting region, the base end region extending in a parallel direction of the middle core part and the two side core parts across an axis of the middle core part in each of the two end core parts, and the projecting region projecting toward the middle core part from the base end region.

2 . The reactor of claim 1 , wherein the projecting region has a tip part reaching the end part of the winding portion on a proximate side.

3 . The reactor of claim 1 , wherein a central region in an axial direction of the middle core part is constituted by the first region.

4 . The reactor of claim 1 , wherein a region of each of the two end core parts facing the winding portion is constituted by the first region.

5 . The reactor of claim 1 , wherein each of the two side core parts is constituted by the first region.

6 . The reactor of claim 1 , wherein the relative magnetic permeability in the first region is 5 or more and 50 or less.

7 . The reactor of claim 1 , wherein the relative magnetic permeability in the second region is 50 or more and 500 or less.

8 . The reactor of claim 1 , wherein the first region is constituted by a compact of a composite material, a soft magnetic powder being dispersed in a resin in the composite material.

9 . The reactor of claim 1 , wherein the second region is constituted by a powder compact made of a soft magnetic powder.

10 . The reactor of claim 1 , wherein:
the magnetic core is composed of two core pieces having the same shape, and each of the two core pieces is an E-shaped member including one of the two end core parts, a part of the middle core part and a part of each of the two side core parts.

11 . The reactor of claim 1 , comprising a molded resin portion for at least partially covering the magnetic core.

12 . A converter, comprising the reactor of claim 1 .

13 . A power conversion device, comprising the converter of claim 12 .

Assignees

• Autonetworks Technologies Ltd
• Sumitomo Wiring Systems
• Sumitomo Electric Industries

Inventors

• Inaba Kazuhiro

Classifications

• H01F27/24 Primary

  Magnetic cores · CPC title

• H01F37/00

  Fixed inductances not covered by group H01F17/00 · CPC title

• H01F1/20

  in the form of particles, e.g. powder (H01F1/147 takes precedence) · CPC title

• H01F27/022

  Encapsulation · CPC title

• H01F1/26 Primary

  by macromolecular organic substances · CPC title