JP2013251051A - Cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cable that can reduce abnormal noise generated by vibrations.SOLUTION: A cable 1 is composed of three covered electric wires 2 so as to be able to transfer electric power of a three-phase electric current. The three covered electric wires 2 are integrated such that their axial directions run parallel to one another and adjoining covered electric wires 2 come in close contact with each other. The three covered electric wires 2 may be integrated by being twisted together or by being bundled by a binding member. Since the three covered electric wires 2 are integrated, a force to make the covered electric wires 2 vibrate by an attractive force or a repulsive force between closely adhered plurality of covered electric wires 2 is cancelled and the entire cable 1 becomes free from vibration. As a result, generation of abnormal noise can be suppressed.

Description

  The present invention relates to a cable.

For example, in a hybrid vehicle or an electric vehicle, three-phase AC power of several hundred volts from an inverter device is supplied to a driving motor for traveling through three wires.
In such a case, vibrations may occur in the electric wires due to the interaction of the magnetic fields caused by the currents flowing through the electric wires, and the vibrations may propagate to the body or the like to generate abnormal noise.

  As a countermeasure against such abnormal noise generation, for example, a technique disclosed in Patent Document 1 has been proposed. The technique disclosed in this document is to suppress vibration generated in a power line between an inverter and a motor of an elevator. A plurality of electric wires are clamped by a cable fixing device, and a bottom portion of the cable fixing device is attached to a machine room. It is intended to suppress the vibration of the electric wire by fixing it to the floor surface or the like.

JP 2007-31057 A

  However, if the above technique is applied to the vehicle as it is, the cable fixing device is fixed to the body. However, in this case, the vibration of the electric wire is more easily transmitted to the body, and there is a possibility that the abnormal noise will be increased.

  This invention is completed based on the above situations, Comprising: It aims at providing the cable which can reduce the noise generated by the vibration of an electric wire.

  The present invention is a cable including a plurality of covered electric wires in which a conductor is coated with an insulator, and the plurality of covered electric wires are parallel to each other in the axial direction, and adjacent covered electric wires are in close contact with each other. It is integrated.

  According to such a configuration, the attractive force / repulsive force generated due to the interaction of the magnetic field between the adjacent covered electric wires is canceled by the integrated force, and the vibration of the entire cable is suppressed. Thereby, generation | occurrence | production of unusual noise can be suppressed.

  The cable of the present invention may be one in which the plurality of covered electric wires are integrated by being twisted together, and the plurality of covered electric wires are integrated by being bundled by a binding member. There may be.

  ADVANTAGE OF THE INVENTION According to this invention, the cable which can reduce the abnormal noise which generate | occur | produces by the vibration of an electric wire can be provided.

The perspective view of the cable of Embodiment 1 The perspective view of the cable of the modification 1 The perspective view of the cable of the modification 2

<Embodiment 1>
Embodiment 1 of the present invention will be described with reference to FIG. The cable 1 of this embodiment is used for supplying three-phase AC power from an inverter device to a drive motor for rear wheels in a hybrid vehicle, an electric vehicle, or the like.

  The cable 1 is composed of three covered electric wires 2 so that three-phase AC power can be transmitted. Each covered electric wire 2 has a known structure in which an insulating coating 4 (corresponding to an insulator) is coated around a core wire 3 (corresponding to a conductor).

  The three covered electric wires 2 are integrated so that the axial directions thereof are parallel to each other and the adjacent covered electric wires 2 are in close contact with each other by being twisted together.

  When two linear conductors through which current flows are close to each other, attractive / repulsive force is generated in the conductors due to the interaction of magnetic fields generated around each conductor. Similarly, when three insulated wires 2 are routed close to each other in order to transmit three-phase alternating current power, vibration is generated in the free covered wires 2 due to the above attractive force / repulsive force, and this vibration is It may propagate to the body of the body and generate abnormal noise. Note that the sum of the attraction / repulsion forces acting on the three covered wires 2 is always zero.

  Therefore, in the present embodiment, the three covered electric wires 2 are integrated and wired by twisting them together. According to such a configuration, the force to vibrate the covered electric wire 2 by the attractive force / repulsive force between the plurality of closely covered covered electric wires 2 is offset by the tightening force by twisting, and the cable 1 as a whole Vibration is suppressed. Thereby, generation | occurrence | production of unusual noise can be suppressed.

  In addition, although the twist pitch of the three covered electric wires 2 is not limited in general, it should just be set to such an extent that the covered electric wires 2 do not disperse | distribute by vibration.

<Modification 1>
In FIG. 2, the cable 10 of the modification 1 was shown. Similar to the first embodiment, the cable 10 includes three covered electric wires 2.

  In this modification, the three covered electric wires 2 are arranged in a stacked manner (in the form of drawing a regular triangle when the centers of the core wires 3 are connected) as viewed from the cross-sectional direction, A tape 11 (corresponding to a binding member) is wound at regular pitches in the length direction of the electric wire 2. Thereby, the three covered electric wires 2 are integrated so that the axial directions thereof are parallel to each other and the adjacent covered electric wires 2 are in close contact with each other. The binding pitch is not limited in general, but may be set to such an extent that the covered electric wires 2 are not separated from each other by vibration.

  Even with such a configuration, the force to vibrate the covered electric wire 2 by the attractive force / repulsive force between the plurality of closely covered covered electric wires 2 is offset by the tape winding force, and the cable 1 as a whole suppresses vibration. Is done. Thereby, generation | occurrence | production of unusual noise can be suppressed.

<Modification 2>
In FIG. 3, the cable 20 of the modification 2 was shown. Similar to the first embodiment, the cable 20 includes three covered electric wires 2.

  In this modification, the three covered electric wires 2 are arranged in a line, that is, in parallel so that the core wires 3 of the respective covered electric wires 2 are located on the same plane, The tape 11 is wound at regular pitches in the vertical direction. Thereby, the three covered electric wires 2 are integrated so that the axial directions thereof are parallel to each other and the adjacent covered electric wires 2 are in close contact with each other. The binding pitch is not limited in general, but may be set to such an extent that the covered electric wires 2 are not separated from each other by vibration.

  Even with such a configuration, the force to vibrate the covered electric wire 2 by the attractive force / repulsive force between the plurality of closely covered covered electric wires 2 is offset by the tape winding force, and the cable 1 as a whole suppresses vibration. Is done. Thereby, generation | occurrence | production of unusual noise can be suppressed.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the above embodiment and the modification, the number of the covered electric wires 2 is three, but the number of the covered electric wires may be two, or four or more.

(2) In the above modification, the plurality of covered electric wires 2 are integrated by winding the tape 11, but the binding member is not limited to the tape, and for example, a string may be used.

1, 10, 20 ... cable 2 ... covered wire 3 ... core wire (conductor)
4 ... Insulation coating (insulator)
11 ... Tape (bundling member)

Claims (3)

A cable comprising a plurality of covered electric wires in which a conductor is covered with an insulator,
A cable in which the plurality of covered electric wires are integrated so that axial directions thereof are parallel to each other and adjacent covered electric wires are in close contact with each other. The cable according to claim 1, wherein the plurality of covered electric wires are integrated by being twisted together. The cable according to claim 1, wherein the plurality of covered electric wires are integrated by being bundled by a binding member.

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