Reactor

Patent metadata

Field	Value
Publication number	US-2017194087-A1
Application number	US-201515313333-A
Country	US
Kind code	A1
Filing date	Jun 1, 2015
Priority date	Jun 6, 2014
Publication date	Jul 6, 2017
Grant date	—

Abstract

Provided is a reactor having a small installation area, low loss, and excellent productivity. The reactor includes a coil having a pair of winding portions and that are arranged side by side, and a magnetic core having a U-shaped core piece that is part of a powder compact. The U-shaped core piece includes a side base that has a portion opposite the ends of the pair of winding portions and uncovered by the winding portions, and disposed across the pair of winding portions, a pair of middle portions that protrude from the side base and respectively disposed inside the pair of winding portions, and an end surface facing a gap, a side extension portion extending from the side base orthogonally from the middle portions, and a central protruding portion protruding from the side base's central region, and are arranged side by side, away from the middle portions.

First claim

1 . A reactor comprising:
a coil having a pair of winding portions that are obtained by helically winding a winding wire and that are arranged side by side; and a magnetic core having a U-shaped core piece that is part of a powder compact, wherein the U-shaped core piece includes: a side base that has a portion opposite to an end surface of the pair of winding portions, is not covered by the winding portions, and is disposed across the pair of winding portions; a pair of middle portions that protrude from the side base to be respectively disposed inside the pair of winding portions, and have an end surface facing a gap; a side extension portion extending from the side base in a direction intersecting an axial direction of the middle portions; and a central protruding portion that protrudes from the side base's central region, with respect to a direction in which the pair of middle portions are arranged side by side, away from the middle portions.

2 . The reactor according to claim 1 , wherein
the side extension portion extends in that intersection direction that is a direction toward an installation target when the reactor is attached to the installation target, and a surface opposite to the installation target of the side extension portion serves as an installation surface.

3 . The reactor according to claim 2 , wherein
the side extension portion also extends in that intersection direction that is a direction away from the installation target.

4 . The reactor according to claim 1 , wherein
when a sum of a thickness of the side base along the axial direction of the middle portions and a protruding length of the central protruding portion is a thickness T A , and a sum of a length protruding along the axial direction of the middle portions and the thickness of the side base is a thickness T B , then a thickness ratio T A /T B is at least 0.5 and not more than 2.

5 . The reactor according to claim 1 , wherein
when a length extending from a side surface of the side base along the direction in which the pair of middle portions are arranged side by side to a side edge of the central protruding portion is a width W 1S , a length of a central outer end surface of the central protruding portion that is parallel with the direction in which the pair of middle portions are arranged side by side is a width W 1C , a length of each of the middle portions along the direction in which the pair of middle portions are arranged side by side is a width W 2S , and a length between the pair of middle portions along the direction in which the pair of middle portions are arranged side by side is a width W 2C , then a ratio of inner and outer widths (W 1S /W 1C )/(W 2S /W 2C ) is at least 0.8 and not more than 1.25.

6 . The reactor according to claim 5 , wherein
both a ratio of left and right widths (W 1S /W 2S ) and a ratio of central widths (W 1C /W 2C ) are at least 0.8 and not more than 1.25.

7 . The reactor according to claim 1 , wherein
at least one corner of the U-shaped core piece is subjected to R-chamfering or C-chamfering.

8 . The reactor according to claim 2 , wherein when a sum of a thickness of the side base along the axial direction of the middle portions and a protruding length of the central protruding portion is a thickness T A , and a sum of a length protruding along the axial direction of the middle portions and the thickness of the side base is a thickness T B , then a thickness ratio T A /T B is at least 0.5 and not more than 2.

9 . The reactor according to claim 3 , wherein when a sum of a thickness of the side base along the axial direction of the middle portions and a protruding length of the central protruding portion is a thickness T A , and a sum of a length protruding along the axial direction of the middle portions and the thickness of the side base is a thickness T B , then a thickness ratio T A /T B is at least 0.5 and not more than 2.

10 . The reactor according to claim 2 , wherein when a length extending from a side surface of the side base along the direction in which the pair of middle portions are arranged side by side to a side edge of the central protruding portion is a width W 1S , a length of a central outer end surface of the central protruding portion that is parallel with the direction in which the pair of middle portions are arranged side by side is a width W 1C , a length of each of the middle portions along the direction in which the pair of middle portions are arranged side by side is a width W 2S , and a length between the pair of middle portions along the direction in which the pair of middle portions are arranged side by side is a width W 2C , then a ratio of inner and outer widths (W 1S /W 1C )/(W 2S /W 2C ) is at least 0.8 and not more than 1.25.

11 . The reactor according to claim 3 , wherein when a length extending from a side surface of the side base along the direction in which the pair of middle portions are arranged side by side to a side edge of the central protruding portion is a width W 1S , a length of a central outer end surface of the central protruding portion that is parallel with the direction in which the pair of middle portions are arranged side by side is a width W 1C , a length of each of the middle portions along the direction in which the pair of middle portions are arranged side by side is a width W 2S , and a length between the pair of middle portions along the direction in which the pair of middle portions are arranged side by side is a width W 2C , then a ratio of inner and outer widths (W 1S /W 1C )/(W 2S /W 2C ) is at least 0.8 and not more than 1.25.

12 . The reactor according to claim 4 , wherein when a length extending from a side surface of the side base along the direction in which the pair of middle portions are arranged side by side to a side edge of the central protruding portion is a width W 1S , a length of a central outer end surface of the central protruding portion that is parallel with the direction in which the pair of middle portions are arranged side by side is a width W 1C , a length of each of the middle portions along the direction in which the pair of middle portions are arranged side by side is a width W 2S , and a length between the pair of middle portions along the direction in which the pair of middle portions are arranged side by side is a width W 2C , then a ratio of inner and outer widths (W 1S /W 1C )/(W 2S /W 2C ) is at least 0.8 and not more than 1.25.

13 . The reactor according to claim 2 , wherein at least one corner of the U-shaped core piece is subjected to R-chamfering or C-chamfering.

14 . The reactor according to claim 3 , wherein at least one corner of the U-shaped core piece is subjected to R-chamfering or C-chamfering.

15 . The reactor according to claim 4 , wherein at least one corner of the U-shaped core piece is subjected to R-chamfering or C-chamfering.

16 . The reactor according to claim 5 , wherein at least one corner of the U-shaped core piece is subjected to R-chamfering or C-chamfering.

17 . The reactor according to claim 6 , wherein at least one corner of the U-shaped core piece is subjected to R-chamfering or C-chamfering.

Assignees

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

Inventors

• Yamamoto Shinichirou
• Inaba Kazuhiro

Classifications

• H01F27/255 Primary

  made from particles (H01F27/26 takes precedence) · CPC title

• H01F27/29

  Terminals; Tapping arrangements {for signal inductances} · CPC title

• H01F1/14741

  pressed, sintered or bonded together · CPC title

• H01F37/00

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

• H01F27/06

  Mounting, supporting or suspending transformers, reactors or choke coils {not being of the signal type} · CPC title