Noise suppression cable, core assembly, and electrical device

Patent metadata

Field	Value
Publication number	US-9508468-B2
Application number	US-201514622574-A
Country	US
Kind code	B2
Filing date	Feb 13, 2015
Priority date	Feb 19, 2014
Publication date	Nov 29, 2016
Grant date	Nov 29, 2016

Abstract

A noise suppression cable includes an electrical wire, a first magnetic material including a pair of first surfaces formed along an axis direction of the electrical wire and a convex portion projecting from the first surfaces, and a second magnetic material including a pair of second surfaces disposed on a periphery of the electrical wire, the pair of the second surfaces contacting the pair of the first surfaces such that a tubular shape is formed by the first and second magnetic materials. The first magnetic material and the second magnetic material are configured to generate a compression stress in the convex portion of the first magnetic material by receiving an external force so as to reduce a relative permeability of the convex portion.

First claim

What is claimed is:

1. A noise suppression cable, comprising:
an electrical wire; and
a core assembly comprising a tubular shape and provided around a periphery of the electrical wire,
the core assembly comprising:
a first magnetic material comprising a pair of first surfaces formed along a longitudinal direction of the electrical wire of the core assembly and a convex portion projecting from the first surfaces; and
a second magnetic material comprising a pair of second surfaces formed along the longitudinal direction of the electrical wire of the core assembly,

wherein the pair of the second surfaces of the second magnetic material contacts the pair of the first surfaces of the first magnetic material,
wherein the first magnetic material and the second magnetic material are configured to generate a compression stress in the convex portion of the first magnetic material by receiving an external force so as to reduce a relative permeability of the convex portion,
wherein, at one edge of the core assembly, the convex portion comprises a plurality of convex portions projecting from one of the pair of first surfaces toward the second magnetic material,
wherein the second magnetic material further comprises a plurality of concave portions extending from one of the pair of second surfaces toward an inside of the second magnetic material, each of the concave portions corresponding to each of the convex portions, and
wherein, at the other edge of the core assembly, an entirety of another one of the pair of the first surfaces and another one of the pair of the second surfaces contact each other flatly.

2. The noise suppression cable according to claim 1 , wherein the second magnetic material further comprises a concave portion in the second surfaces, the concave portion corresponding to the convex portion, and
wherein a height of the convex portion from one of the first surfaces is more than a depth of the concave portion from one of the second surfaces.

3. The noise suppression cable according to claim 2 , wherein the convex portion is disposed at one of the pair of the first surfaces, and
wherein the concave portion is disposed at one of the pair of the second surfaces.

4. The noise suppression cable according to claim 2 , wherein the convex portion and the concave portion are arranged with an interval in plural lines along the longitudinal direction of the electrical wire of the core assembly.

5. A core assembly, comprising the first magnetic material and the second magnetic material according to the claim 1 .

6. An electrical device, comprising:
the noise suppression cable according to claim 1 ;
a detection element to detect a magnetic flux emitted from the noise suppression cable; and
a substrate on which the noise suppression cable and the detection element are mounted.

7. The electrical device according to claim 6 , wherein the detection element is provided on both of the first magnetic material and the second magnetic material of the core assembly.

8. The electrical device according to claim 6 , wherein the detection element comprises a magnetic sensor.

9. The electrical device according to claim 6 , wherein the detection element is configured to detect a magnetic flux density based on the magnetic flux emitted from the first surfaces of the first magnetic material and the second surfaces of the second magnetic material of the core assembly.

10. The electrical device, according to claim 6 , further comprising:
a CPU configured to compare a magnetic flux density detected by the detection element and a threshold value of the magnetic flux density.

11. The noise suppression cable according to claim 1 , further comprising:
a pair of fixtures formed to cover an outer periphery surface of the first magnetic material and an outer periphery surface of the second magnetic material.

12. The noise suppression cable according to claim 11 , wherein each of the pair of fixtures comprises a main body substantially having a C-shape and seat portions provided at both ends of the main body.

13. The noise suppression cable according to claim 1 , wherein the electrical wire comprises:
internal conductors comprising a plurality of conductors which are stranded;
an insulating layer covering a periphery of the internal conductors to insulate the internal conductors; and
an external conductor layer disposed on a periphery of the insulating layer.

14. The noise suppression cable according to claim 13 , wherein the electrical wire further comprises:
a resin tape layer disposed on a periphery of the external conductor layer;
a magnetic material tape layer disposed on the periphery of the resin tape layer; and
a sheath disposed on a periphery of the magnetic material tape layer as an insulating protective layer.

15. The noise suppression cable according to claim 14 , wherein the sheath comprises a resin, and
wherein the core assembly is disposed on a surface of the sheath.

16. The noise suppression cable according to claim 15 , wherein the sheath is sandwiched between the first magnetic material and the second magnetic material.

17. The noise suppression cable according to claim 16 , further comprising:
a pair of fixtures sandwiching an outer periphery surface of the first magnetic material and an outer periphery surface of the second magnetic material.

18. The noise suppression cable according to claim 1 , wherein a height of said each of the convex portions from said one of the first surfaces is more than a depth of each of the concave portion from said one of the second surfaces.

Assignees

• Hitachi Metals Ltd

Inventors

• Nakatani Katsutoshi
• Sumi Yosuke
• Ajima Kenji
• Akimoto Katsuya
• Chiwata Naofumi
• Okikawa Hiroshi
• Muto Yasuharu

Classifications

• H01B9/006 Primary

  Constructional features relating to the conductors · CPC title

• H01F2017/065

  Core mounted around conductor to absorb noise, e.g. EMI filter · CPC title

• H05K9/0098 Primary

  for shielding electrical cables · CPC title