Reactor

Patent metadata

Field	Value
Publication number	US-9959968-B2
Application number	US-201514604380-A
Country	US
Kind code	B2
Filing date	Jan 23, 2015
Priority date	Jan 28, 2014
Publication date	May 1, 2018
Grant date	May 1, 2018

Abstract

A reactor uses a composite magnetic core which combines a ferrite core and a soft magnetic metal core. The reactor is composed of a pair of yoke portion cores composed of ferrite cores, winding portion core(s) disposed between the opposite planes of the yoke portion cores, and coil(s) wound around the winding portion core(s). Flange-like members are disposed at the end part of the winding portion core(s) in a way of being external connected with the periphery of winding portion core(s) which is composed of a soft magnetic metal core. The flange-like member is composed of a metal material with iron as the main component which can be magnetically attracted to a magnet, and a junction portion of the flange-like member and the yoke portion core is formed at one flat plane of the member which is the same plane with an end plane of the winding portion core.

First claim

What is claimed is:

1. A reactor comprising:
a pair of yoke portion cores composed of ferrite cores and arranged opposing each other,
one or more winding portion cores disposed between opposite planes of said yoke portion cores, each of the one or more winding portion cores having opposing end surfaces, and
one or more coils each wound around a corresponding one of the one or more winding portion cores,
wherein:
one or more flange-like members are each disposed at an end part of a corresponding one of the winding portion cores in a way of being externally connected with a periphery of said corresponding one of the one or more winding portion cores, each of said one or more flange-like members being a separate element from the corresponding winding portion core and having an outer surface,
each of said one or more winding portion cores is composed of a soft magnetic metal core,
each one of the opposing end surfaces of the one or more winding portion cores is in the same plane as the outer surface of one of the one or more flange-like members, and
each of said one or more flange-like members is a homogenous steel plate in which a notch from an inner peripheral end to an outer peripheral end is provided at one place in a peripheral direction.

2. The reactor according to claim 1 , wherein,
each of said one or more flange-like members is composed of a soft magnetic metal powder core.

3. The reactor according to claim 1 , each of said one or more flange-like members being composed of a material different from a material of which the corresponding one of the one or more winding portion cores is composed.

4. The reactor according to claim 1 , wherein:
the one or more flange-like members extend radially a distance less than the radial width of the one or more coils;
each of the one or more flange-like members has an inner surface; and
the one or more coils have outer surfaces that are spaced inwardly from the inner surfaces of the one or more flange-like members.

5. The reactor according to claim 1 , wherein the one or more flange-like members have an outer periphery that is not circular.

6. The reactor according to claim 5 , wherein the outer periphery of the one or more flange-like members is substantially rectangular.

7. The reactor according to claim 1 , wherein there are gaps between (1) the opposing end surfaces of the one or more winding portion cores and the outer surfaces of the one or more flange-like members and (2) the pair of yoke portion cores.

8. The reactor according to claim 7 , wherein the gaps include insulating material.

Assignees

• Tdk Corp

Inventors

• Kuroda Tomofumi
• Sakurai Yu

Classifications

• H01F27/263 Primary

  Fastening parts of the core together · CPC title

• H01F3/14

  Constrictions; Gaps, e.g. air-gaps (in magnetic shunt paths H01F3/12) · CPC title

• H01F27/34

  Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields · CPC title

• H01F3/10 Primary

  Composite arrangements of magnetic circuits · CPC title

• H01F37/00

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