REACTOR

• US 20120206232A1
• Filed: 10/26/2010
• Published: 08/16/2012
• Est. Priority Date: 10/29/2009
• Status: Active Grant

• Current Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Original Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Inventors: Yamamoto, Shinichiro, Kato, Masayuki
• Granted Patent: US 9,147,521 B2
• Time in Patent Office: Days
• US Class Current: 336/210
• CPC Class Codes: H01F 27/306 Fastening or mounting coils or windings on core, casing or other support
• 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

To provide a reactor whose number of components is small and that exhibits excellent assemblability. A reactor 1 includes a coil 2 having a pair of coil elements 2a and 2b, and a core unit 3 having a pair of intermediate core portions 30 around which the coil elements 2a and 2b are respectively disposed. The core unit 3 is formed to be annular by a combination of intermediate core pieces 31 that structure intermediate core portions 30, a pair of end core pieces 32 that clamps a pair of intermediate core portions 30 disposed in parallel to each other, and gap members 3g each disposed between each ones of the core pieces. The end core pieces 32 respectively include clamping faces 321 for clamping the intermediate core portions 30, each structured with a single plane. An installed face 320l of each of the end core pieces 32 projects further than the installed face 31l of the intermediate core pieces 31. One gap member 3g is interposed between the end core piece 32 and the intermediate core portion 30, and relative permeability of the gap member 3g is greater than 1. This structure simplifies the shape of the core pieces, and allows the number of components to be small despite the core unit 3 partially projects.

Claims

1. A reactor, comprising:

a coil including a pair of coil elements having their respective axes paralleled to each other; and

a core unit formed to be annular by a combination of a plurality of magnetic core pieces and gap members each disposed between each ones of the magnetic core pieces, the core unit having a pair of intermediate core portions around which the coil elements are respectively disposed, wherein

the magnetic core pieces are each structured with a powder magnetic core, the magnetic core pieces include at least one intermediate core piece structuring each of the intermediate core portions, and

the magnetic core pieces include a pair of end core pieces disposed so as to clamp the intermediate core portions around which the coil elements are disposed, the pair of end core pieces having no coil disposed thereto wherein

one of an installed face becoming an installed side when the reactor is installed and a face opposite to the installed face in each of the end core pieces projects further than one of an installed face becoming an installed side when the reactor is installed and a face opposite to the installed face in each of the intermediate core portions,

the end core pieces respectively include clamping faces that clamp the intermediate core portions disposed in parallel to each other, the clamping faces each being structured with a single plane, and

out of the gap members, at least one gap member is disposed between one of the end core pieces and the intermediate core piece, the gap members having a relative permeability being greater than 1.

2. The reactor according to claim 1, wherein

the installed face of each of the end core pieces and the face opposite to the installed face of each of the end core pieces project further than the installed face of each of the intermediate core portions and the face opposite to the installed face of each of the intermediate core portions.

3. The reactor according to claim 1, wherein

when the intermediate core portions are disposed, an external periphery of the clamping face of each of the end core pieces projects further than an outer side face of each of the intermediate core portions.

4. The reactor according to claim 1, wherein the gap members have a relative permeability being smaller than 1.5.

5. The reactor according to claim 1, wherein the gap members are made of resin mixed with magnetic powder.