Reactor

• US 9,455,080 B2
• Filed: 01/22/2015
• Issued: 09/27/2016
• Est. Priority Date: 01/28/2014
• Status: Active Grant

• Current Assignee: TDK Corporation
• Original Assignee: TDK Corporation
• Inventors: Kuroda, Tomofumi, Sakurai, Yu, Itoh, Hideyuki
• Primary Examiner(s): Enad, Elvin G
• Assistant Examiner(s): HOSSAIN, KAZI S
• Application Number:
  US14/602,821
• Publication Number:
  US 20150213942A1
• Time in Patent Office: 614 Days
• Field of Search: 336/178, 336/212, 336/131, 336/175
• US Class Current: 1/1
• CPC Class Codes: H01F 2003/106 Magnetic circuits using combinations of different magnetic materials
• CPC Class Codes: H01F 27/255 made from particles H01F27/26 takes precedence
• CPC Class Codes: H01F 27/34 Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
• CPC Class Codes: H01F 3/10 Composite arrangements of magnetic circuits
• CPC Class Codes: H01F 3/14 Constrictions; Gaps, e.g. air-gaps in magnetic shunt paths H01F3/12
• CPC Class Codes: H01F 37/00 Fixed inductances not covered by group H01F17/00

Abstract

A reactor using a composite magnetic core in which a ferrite core and a soft magnetic metal core are combined. The reactor is composed of a pair of yoke portion magnetic portions composed of ferrite, winding portion core(s) disposed between the opposite planes of the yoke portion cores, and coil(s) winding around the winding portion core(s). The winding portion core(s) is/are formed using a soft magnetic metal core with a substantially constant cross sectional area. Junction portion cores composed of soft magnetic metal powder cores with a tabular shape are disposed at the spaces where the winding portion core(s) face(s) the yoke portion cores, and the area of the part where the junction portion core faces the yoke portion core is made to be 1.3 to 4.0 times that of the section of the winding portion core.

Claims

1. A reactor comprising:

a pair of yoke portion cores composed of ferrite;

a winding portion core spanning the yoke portion cores, the winding portion core being composed of soft magnetic metal and having a substantially constant cross sectional area;

a coil winding around the winding portion core; and

junction portion cores composed of soft magnetic metal powder and having a tabular shape disposed at spaces where the winding portion core faces the yoke portion cores,

an area of a part where each of the junction portion cores faces each of the yoke portion cores is 1.3 to 4.0 times the cross sectional area of the winding portion core.

2. The reactor of claim 1, further comprising:

gaps provided at spaces where the yoke portion cores face the junction portion cores.

3. The reactor of claim 1, further comprising:

gaps provided at spaces where the winding portion core faces the junction portion cores.

4. The reactor of claim 1, comprising a plurality of winding portion cores with a respective plurality of coils.