JP2017139130A - Noise suppression cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a noise suppression cable having a novel structure capable of suppressing degradation of a noise suppression effect.SOLUTION: A noise suppression cable includes an insulation wire, a magnetic tape layer arranged on an outer periphery of the insulation wire and configured as a circular magnetic member by winding a magnetic tape, an inner periphery side member on an outer periphery side of the insulation wire and arranged on an inner periphery side of the magnetic tape, and an outer periphery side member arranged on the outer periphery side of the magnetic tape layer, and the inner periphery side member has at least one of a pushing structure in which the inner periphery side member pushes the magnetic tape layer to the outer periphery member by energizing the magnetic tape layer by an elastic force from the inner periphery side to suppress the magnetic tape is unwound, and a pushing structure in which the outer periphery side member pushes the magnetic tape layer to the inner periphery member by energizing the magnetic tape layer by an elastic force from the outer periphery side to suppress the magnetic tape is unwound.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a noise suppression cable.

  A cable that suppresses noise by winding a magnetic tape around the outer periphery of an insulated wire has been proposed (see, for example, Patent Document 1).

JP 2002-25356 A

  When such a noise suppression cable is expected to suppress the electromagnetic noise by increasing the inductance of the magnetic tape, the wound magnetic tape is loosened, which reduces the effective magnetic permeability. There is a possibility that the effect of suppressing electromagnetic wave noise is reduced.

  An object of the present invention is to provide a noise suppression cable having a novel structure capable of suppressing a decrease in noise suppression effect.

According to one aspect of the present invention,
Insulated wires,
A magnetic tape layer arranged on the outer periphery of the insulated wire and configured as an annular magnetic member by winding the magnetic tape;
An inner peripheral member disposed on the outer peripheral side of the insulated wire and on the inner peripheral side of the magnetic tape layer;
An outer peripheral member disposed on the outer peripheral side of the magnetic tape layer;
Have
The inner circumferential side member urges the magnetic tape layer from the inner circumferential side by an elastic force, thereby pressing the magnetic tape layer against the outer circumferential side member to suppress loosening of the magnetic tape. And the outer peripheral side member presses the magnetic tape layer against the inner peripheral member by urging the magnetic tape layer from the outer peripheral side by an elastic force, thereby winding the magnetic tape. There is provided a noise suppression cable provided with at least one of a pressing structure that suppresses loosening.

  It can suppress that the annular structure of a magnetic body tape layer is impaired, and can suppress that a noise suppression effect falls.

FIG. 1 is a schematic cross-sectional view of a noise suppression cable according to an embodiment of the present invention. FIG. 2 is a schematic side view illustrating the noise suppression cable according to the embodiment in a stepped state. FIG. 3 is a schematic diagram illustrating a structure for pressing a noise suppression cable according to the embodiment.

  Hereinafter, an example of the noise suppression cable 100 according to the embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a schematic cross-sectional view of the noise suppression cable 100. FIG. 2 is a schematic side view showing the noise suppression cable 100 in a stepped state. In FIG. 2, illustration of some members shown in FIG. 1 is omitted in order to avoid the complexity of the illustration.

  An exemplary noise suppression cable 100 includes an insulated wire 10, inclusions 15, a resin tape layer 21, a shield layer 22, a resin tape layer 23, an elastic layer 24, a magnetic tape layer 30, and a sheath 41.

  The noise suppression cable 100 is, for example, a three-phase power cable that connects an inverter and a motor, and includes three insulated wires 10. Note that the use of the noise suppression cable 100 is not limited to electric power, and may be used for signals or the like. Moreover, the number of the insulated wires 10 is not limited to three, and may be one, for example, two may be used like a twisted pair wire that transmits a differential signal, or may be four or more. The insulated wire 10 transmits power or a signal having a frequency of 100 kHz to 1 MHz, for example.

  The insulated wire 10 includes a conductor 11 and an insulating layer 12 covered on the outer periphery of the conductor 11. As the insulated wire 10, one having a known structure can be appropriately used as necessary.

  Inclusions 15 are appropriately disposed around the insulated wires 10, and the insulated wires 10 and the inclusions 15 are twisted to constitute the core 16.

  A resin tape layer 21 is disposed on the outer periphery of the core 16. The resin tape layer 21 is formed by wrapping a resin tape. Examples of the resin tape used for the resin tape layer 21 include a tape made of a resin such as polyethylene terephthalate (PET) or polypropylene resin. In addition, the same thing can be used also as a resin tape which forms the below-mentioned resin tape layer 23. FIG.

  A shield layer 22 is disposed on the outer periphery of the resin tape layer 21. The shield layer 22 is formed of, for example, a braid of fine metal wires and is electrically grounded. Note that the shield layer 22 may be other than the braid, and may be, for example, one wrapped with a tape with a conductor.

  A resin tape layer 23 is disposed on the outer periphery of the shield layer 22. The resin tape layer 23 is formed by wrapping a resin tape as described above.

  An elastic layer 24 having elasticity (spring property) is disposed on the outer periphery of the resin tape layer 23. The elastic layer 24 is formed by, for example, extruding and coating an elastic material such as resin or rubber on the outer periphery of the resin tape layer 23. The elastic layer 24 is preferably non-conductive. Examples of the resin material used for the elastic layer 24 include polyetheretherketone (PEEK), polycarbonate (PC), and the like. Examples of the rubber material used for the elastic layer 24 include silicone rubber, chloroprene rubber, and chlorinated polyethylene rubber.

  In the pressing structure described later, the magnetic tape layer 30 is pressed well, that is, from the viewpoint of obtaining the same level of spring force as the magnetic tape layer 30, the Young's modulus of the material constituting the elastic layer 24 is, for example, It is preferably 1 GPa or more, and more preferably 10 GPa or more. Note that the spring force of the elastic layer 24 can be adjusted by the thickness of the elastic layer 24. From the viewpoint of having a large Young's modulus, it can be said that a resin material is more suitable as a material for the elastic layer 24 than a rubber material. From the viewpoint of facilitating winding so that the magnetic tape layer 30 bites into the elastic layer 24 in the pressing structure described later, the Young's modulus of the material constituting the elastic layer 24 is the material constituting the magnetic tape layer 30. It is preferable that the Young's modulus is smaller.

  A magnetic tape layer 30 is disposed on the outer periphery of the elastic layer 24. The magnetic tape layer 30 is formed by winding a magnetic tape made of a magnetic material for at least one turn in the circumferential direction of the elastic layer 24, for example, two turns in a direction orthogonal to the longitudinal direction of the noise suppression cable 100. It is configured as an annular magnetic member by winding about minutes. When the magnetic tape is wound and the portions laminated in the radial direction come into contact with each other, the magnetic tape layer 30 has a structure that is closed in a ring shape.

  As a magnetic material used for the magnetic tape, a soft magnetic material having a small coercive force and a high magnetic permeability is preferable in order to suppress electromagnetic wave noise. Examples of soft magnetic materials include amorphous alloys such as Co-based amorphous alloys and Fe-based amorphous alloys, ferrites such as Mn-Zn based ferrite, Ni-Zn based ferrite, Ni-Zn-Cu based ferrite, and Fe-Ni based alloys. (Permalloy), soft magnetic metals such as Fe-Si-Al alloys (Sendust), Fe-Si alloys (silicon steel), and the like can be used.

  Since the magnetic tape layer 30 configured as an annular magnetic member is disposed on the outer periphery of the insulated wire 10, the noise current is suppressed from flowing through the insulated wire 10, and a noise suppressing effect is obtained.

  In addition, the magnetic tape layer 30 suppresses the flow of the noise current by concentrating the magnetic field caused by the noise current to produce a noise suppression effect, and does not need to be electrically grounded ( Not grounded).

  In order to obtain a good noise suppression effect, the contact of the portions where the magnetic tapes are laminated in the radial direction is released (the winding of the magnetic tape is loosened), and the annular structure of the magnetic tape layer 30 is damaged. I want to suppress it. Thus, in the noise suppression cable 100 according to the present embodiment, the pressing structure of the magnetic tape layer 30 as described below prevents the annular structure of the magnetic tape layer 30 from being damaged.

  A plurality of magnetic tape layers 30 are arranged in the longitudinal direction of the noise suppression cable 100 and spaced from each other, for example, arranged at a constant period. If the width (size in the longitudinal direction of the noise suppression cable 100) L1 per one magnetic tape layer 30 is too long, the flexibility of the noise suppression cable 100 is lowered. For this reason, the width L1 of the magnetic tape layer 30 is, for example, preferably not more than 5 times the diameter of the noise suppression cable 100, and more preferably not more than 1 time. In order to enhance the noise suppression effect per magnetic tape layer 30, the width L1 of the magnetic tape layer 30 is preferably, for example, not less than ½ times the diameter of the noise suppression cable 100. .

  Further, if the arrangement interval (arrangement period, pitch) L2 between the magnetic tape layers 30 adjacent to each other in the longitudinal direction of the noise suppression cable 100 is too narrow, that is, if the ratio of the width L1 to the interval L2 is too large, the noise The flexibility of the suppression cable 100 will fall. For this reason, the ratio L1 / L2 of the width L1 of the magnetic tape layer 30 occupying the arrangement interval L2 of the magnetic tape layer 30 is, for example, preferably 1/2 or less, and more preferably 1/10 or less. preferable.

  For example, the diameter of the noise suppression cable 100 is about 25 mm, the width L1 of the magnetic tape layer 30 is about 20 mm, and the arrangement interval L2 of the magnetic tape layer 30 is about 200 mm, for example. . For example, with such a design, a noise suppression effect of about 20 dB can be obtained in a three-core 38SQ CV-S cable.

  Further, the portion of the elastic layer 24 disposed below (inner peripheral side) of the magnetic tape layer 30 urges the magnetic tape layer 30 from the inner peripheral side by an elastic force, thereby causing the magnetic tape layer 30 to be urged. A structure to be pressed against the outer peripheral side member 40 described later is configured.

  The bias means a state in which an elastic force is applied to the magnetic tape layer 30 from the inner peripheral member 20 side, which will be described later, or elastic to the magnetic tape layer 30 from the outer peripheral member 40 side. It means a state where power is given.

  The magnetic tape layer 30 is formed so that the inner peripheral surface of the magnetic tape layer 30 bites into the elastic layer 24 (the inner peripheral surface of the magnetic tape layer 30 is elastic at a portion where the magnetic tape layer 30 is not disposed). Although it is preferable that the magnetic tape is wound around the elastic layer 24 so as to be disposed on the inner peripheral side with respect to the outer peripheral surface of the layer 24, the configuration is not necessarily limited thereto.

  As long as the effect of the present invention is exhibited, for example, a structure in which another layer such as a resin tape is interposed between the magnetic tape layer 30 and the elastic layer 24 may be used. As long as the elastic force is applied to the magnetic tape layer 30.

  In FIG. 2, a structure in which the outer peripheral surface of the magnetic tape layer 30 is cut into the elastic layer 24 (the outer peripheral surface of the magnetic tape layer 30 is the portion where the magnetic tape layer 30 is not disposed is the elastic layer 24. However, the outer peripheral surface of the magnetic tape layer 30 may have a height that coincides with the outer peripheral surface of the elastic layer 24. You may arrange | position from the outer peripheral surface of the elastic layer 24 to the outer peripheral side.

  A sheath 41 is disposed on the outer periphery of the magnetic tape layer 30. Note that, in a portion where the magnetic tape layer 30 is not disposed, the sheath 41 is disposed on the outer periphery of the elastic layer 24 without the magnetic tape layer 30 interposed therebetween. The sheath 41 is disposed in contact with the magnetic tape layer 30.

  The sheath 41 is formed, for example, by extruding and coating a resin material on the outer periphery of the magnetic tape layer 30 and the elastic layer 24. Examples of the resin material used for the sheath 41 include vinyl chloride resin, ethylene-vinyl acetate copolymer, fluorine-based resin, and silicone-based resin.

  Next, the pressing structure provided in the noise suppression cable 100 will be described with reference to FIG. FIG. 3 is a schematic diagram showing a pressing structure of the noise suppression cable 100.

  Members disposed on the outer peripheral side of the insulated wire 10 (more than the core 16) and disposed on the inner peripheral side of the magnetic tape layer 30, that is, the resin tape layer 21, the shield layer 22, and the resin tape layer in this example 23 and the elastic layer 24 are collectively referred to as an inner peripheral member 20 (relative to the magnetic tape layer 30).

  In addition, a member arranged on the outer peripheral side of the magnetic tape layer 30, that is, the sheath 41 in this example is referred to as an outer peripheral member 40 (relative to the magnetic tape layer 30).

  That is, in the noise suppression cable 100, the inner peripheral member 20 is disposed on the outer periphery (of the core 16) of the insulated wire 10, the magnetic tape layer 30 is disposed on the outer periphery of the inner peripheral member 20, and the magnetic tape layer 30. The outer peripheral side member 40 is arrange | positioned at the outer periphery.

  An elastic layer 24 is disposed as the outermost layer of the inner peripheral side member 20. As described above, the magnetic tape layer 30 is provided so that its inner peripheral surface bites into the elastic layer 24, and is urged by the elastic layer 24 from the inner peripheral side.

  Further, the sheath 41, that is, the outer peripheral member 40 is disposed so as to be in contact with the magnetic tape layer 30.

  Therefore, the magnetic tape layer 30 has the inner circumferential side and the urging force F1 applied from the inner peripheral member 20 by the elastic layer 24 and the reaction force F2 applied from the outer peripheral member 40 as a reaction force of the urging force F1. It is sandwiched between the inner peripheral side member 20 and the outer peripheral side member 40 in a state where pressure is applied from both sides on the outer peripheral side. Thereby, it is suppressed that the winding of a magnetic tape loosens.

  As described above, the noise suppression cable 100 is configured such that the inner peripheral member 20 presses the magnetic tape layer 30 against the outer peripheral member 40 by urging the magnetic tape layer 30 with an elastic force from the inner peripheral side. A pressing structure that suppresses loosening of the body tape is provided.

  As long as the effects of the present invention are obtained, a structure in which another layer such as a resin tape layer is interposed between the magnetic tape layer 30 and the sheath 41, that is, the outer peripheral member 40 is the sheath 41. It is good also as a structure which has another layer. However, in order to press the magnetic tape layer 30 against the outer peripheral member 40, the innermost layer of the outer peripheral member 40 is preferably arranged so as to be in contact with the magnetic tape layer 30.

  Next, a method for manufacturing the noise suppression cable 100 will be exemplarily described.

  The insulated wire 10 and the inclusion 15 are twisted to form the core 16, and a resin tape is wound around the outer periphery of the core 16 to form the resin tape layer 21. A shield layer 22 is provided on the outer periphery of the resin tape layer 21 by, for example, braiding, and the resin tape is wound around the outer periphery of the shield layer 22 to form the resin tape layer 23.

  The elastic layer 24 is formed by extruding and coating an elastic material such as resin or rubber on the outer periphery of the resin tape layer 23.

  At a predetermined position in the longitudinal direction of the noise suppression cable 100, a magnetic tape is wound around the outer periphery of the elastic layer 24 so as to bite into the elastic layer 24, thereby forming a magnetic tape layer 30 as an annular magnetic member.

  Here, the laminated portion of the magnetic tape may be temporarily fixed by, for example, spot welding so that the magnetic tape does not loosen until the next step (sheath forming step). However, it is preferable that the area of the spot welded portion is as narrow as possible in order to suppress a decrease in magnetic permeability due to welding.

  Then, the sheath 41 is formed by extruding and coating a resin material on the outer periphery of the magnetic tape layer 30 and the elastic layer 24. In this way, the noise suppression cable 100 is manufactured.

  The sheath 41 is formed by extruding and coating a resin material directly on the magnetic tape layer 30 and the elastic layer 24, so that the outer peripheral surface of the magnetic tape layer 30 is cut into the elastic layer 24 and the magnetic tape layer 30. Even in the case where a dent is formed in the arrangement portion, a molten resin is filled in such a dent, and a structure in which the magnetic tape layer 30 and the sheath 41 are in contact with each other can be formed.

  As described above, the noise suppression cable 100 according to the present embodiment includes the pressing structure of the magnetic tape layer 30, thereby suppressing the ring structure of the magnetic tape layer 30 from being damaged, and noise. It can suppress that the inhibitory effect falls.

  In the above-described embodiment, the inner peripheral side member 20 presses the magnetic tape layer 30 against the outer peripheral side member 40 by urging the magnetic tape layer 30 from the inner peripheral side by an elastic force. Although the pressing structure that suppresses loosening of the tape is illustrated, as another embodiment, the outer peripheral member 40 urges the magnetic tape layer 30 from the outer peripheral side by an elastic force so that the magnetic tape layer A pressing structure that suppresses loosening of the winding of the magnetic tape by pressing 30 against the inner peripheral member 20 is also conceivable. As such another embodiment, specifically, for example, as the inner peripheral member 20, for example, a vinyl chloride resin, an ethylene-vinyl acetate copolymer, a fluorine resin, a silicone resin, or the like is used, and a polyether is used. Examples include a structure in which an annular member using ether ketone (PEEK), polycarbonate (PC), silicone rubber, chloroprene rubber, chlorinated polyethylene rubber or the like is fitted to the outer periphery of the magnetic tape layer 30.

  As mentioned above, although this invention was demonstrated along embodiment, this invention is not restrict | limited to these. It will be apparent to those skilled in the art that various modifications, improvements, combinations, and the like can be made.

  Hereinafter, preferred embodiments of the present invention will be additionally described.

(Appendix 1)
Insulated wires,
A magnetic tape layer arranged on the outer periphery of the insulated wire and configured as an annular magnetic member by winding the magnetic tape;
An inner peripheral member disposed on the outer peripheral side of the insulated wire and on the inner peripheral side of the magnetic tape layer;
An outer peripheral member disposed on the outer peripheral side of the magnetic tape layer;
Have
The inner circumferential side member urges the magnetic tape layer from the inner circumferential side by an elastic force, thereby pressing the magnetic tape layer against the outer circumferential side member to suppress loosening of the magnetic tape. And the outer peripheral side member presses the magnetic tape layer against the inner peripheral member by urging the magnetic tape layer from the outer peripheral side by an elastic force, thereby winding the magnetic tape. A noise suppression cable provided with at least one of a pressing structure that suppresses loosening.

(Appendix 2)
The inner peripheral member has an elastic layer having elasticity,
The magnetic tape layer is configured by winding the magnetic tape on the elastic layer such that an inner peripheral surface of the magnetic tape layer bites into the elastic layer,
In the pressing structure, a portion of the elastic layer disposed below the magnetic tape layer urges the magnetic tape layer by an elastic force from the inner peripheral side, thereby causing the magnetic tape layer to move to the outer periphery. The noise suppression cable according to supplementary note 1, wherein the cable is pressed against a side member to suppress loosening of the winding of the magnetic tape.

(Appendix 3)
The noise suppression cable according to supplementary note 2, wherein the magnetic tape layer is arranged to bite into the elastic layer up to an outer peripheral surface of the magnetic tape layer.

(Appendix 4)
The noise suppression cable according to appendix 2 or 3, wherein the outer peripheral member has a sheath formed immediately above the magnetic tape layer.

(Appendix 5)
The noise suppression cable according to any one of supplementary notes 1 to 4, wherein a plurality of the magnetic tape layers are arranged in the longitudinal direction of the noise suppression cable and spaced apart from each other.

(Appendix 6)
The noise suppression cable according to appendix 5, wherein the width of each magnetic tape layer is preferably not more than 5 times the diameter of the noise suppression cable, more preferably not more than 1 time the diameter of the noise suppression cable. .

(Appendix 7)
The ratio of the width of one magnetic tape layer to the arrangement interval between the magnetic tape layers adjacent in the longitudinal direction of the noise suppression cable is preferably 1/2 or less, more preferably 1 / The noise suppression cable according to appendix 5 or 6, which is 10 or less.

(Appendix 8)
The noise suppression cable according to any one of appendices 1 to 7, wherein the magnetic tape layer is not electrically grounded.

DESCRIPTION OF SYMBOLS 10 Insulated wire 11 Conductor 12 Insulating layer 15 Inclusion 16 Core 20 Inner peripheral member 21, 23 Resin tape layer 22 Shield layer 24 Elastic layer 30 Magnetic tape layer 40 Outer peripheral member 41 Sheath 100 Noise suppression cable

Claims (5)

Insulated wires,
A magnetic tape layer arranged on the outer periphery of the insulated wire and configured as an annular magnetic member by winding the magnetic tape;
An inner peripheral member disposed on the outer peripheral side of the insulated wire and on the inner peripheral side of the magnetic tape layer;
An outer peripheral member disposed on the outer peripheral side of the magnetic tape layer;
Have
The inner circumferential side member urges the magnetic tape layer from the inner circumferential side by an elastic force, thereby pressing the magnetic tape layer against the outer circumferential side member to suppress loosening of the magnetic tape. And the outer peripheral side member presses the magnetic tape layer against the inner peripheral member by urging the magnetic tape layer from the outer peripheral side by an elastic force, thereby winding the magnetic tape. A noise suppression cable provided with at least one of a pressing structure that suppresses loosening. The inner peripheral member has an elastic layer having elasticity,
The magnetic tape layer is configured by winding the magnetic tape on the elastic layer such that an inner peripheral surface of the magnetic tape layer bites into the elastic layer,
In the pressing structure, a portion of the elastic layer disposed below the magnetic tape layer urges the magnetic tape layer by an elastic force from the inner peripheral side, thereby causing the magnetic tape layer to move to the outer periphery. The noise suppression cable according to claim 1, wherein the cable is pressed against a side member to suppress loosening of the winding of the magnetic tape.   The noise suppression cable according to claim 2, wherein the magnetic tape layer is disposed so as to bite into the elastic layer up to an outer peripheral surface of the magnetic tape layer.   The noise suppression cable according to claim 2 or 3, wherein the outer peripheral member has a sheath formed immediately above the magnetic tape layer.   5. The noise suppression cable according to claim 1, wherein a plurality of the magnetic tape layers are arranged in the longitudinal direction of the noise suppression cable and spaced apart from each other.

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