REACTOR

• US 20150213942A1
• Filed: 01/22/2015
• Published: 07/30/2015
• Est. Priority Date: 01/28/2014
• Status: Active Grant

• Current Assignee: TDK Corporation
• Original Assignee: TDK Corporation
• Inventors: KURODA, Tomofumi, SAKURAI, Yu, ITOH, Hideyuki
• Granted Patent: US 9,455,080 B2
• Time in Patent Office: Days
• 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 tubular 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 composed of a pair of yoke portion cores composed of ferrite, winding portion core(s) disposed between the opposite planes of said yoke portion cores, and coil(s) winding around said winding portion core(s),

wherein, said winding portion core(s) is/are composed of soft magnetic metal core(s) with a substantially constant cross sectional area,

junction portion cores composed of soft magnetic metal powder cores with tubular shapes are disposed at the spaces where said winding portion core(s) face(s) said yoke portion cores,

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

2. The reactor of claim 1, wherein,

a gap is provided at the space where each of said yoke portion cores feces each of said junction portion cores.

3. The reactor of claim 1, wherein,

a gap is provided at the space where each of said winding portion core faces each of said junction portion cores.