JP2000059975A - Coil connection cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect a circuit which supplies a cable charging current from a breakdown even if excessive vibration and impact force are repeatedly applied to a coil connection cable of a propulsive coil of a linear motor car or the like. SOLUTION: A cable itself 1 is formed in the three-layer structure by forming a cable insulator to the external side of a cable conductor and then further forming a semi-conductive sheath at the external side thereof. In order to connect the cable 1 to the coil, a connector connected to the cable conductor is provided at the center, while connecting portions 2, 2 insulated from the connector and having external semiconductive layer formed in contact with the semi- conductive sheath are provided at both ends of cable 1 at the external circumference. A grounding wire 4 is isolated from the cable 1 and wound in spiral at the external circumference of the cable 1. Both ends the grounding wire 4 are connected between metal clamping tools 3, 3 for fixing the connecting portions 2, 2 to the coil by tightening the external circumference of the external semi-conductive layer of the connecting portions 2, 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil connecting cable for connecting coils such as a propulsion coil of a linear motor car.

[0002]

2. Description of the Related Art The propulsion coils of a linear motor car are arranged continuously in the longitudinal direction of the lateral wall of a guideway, and the individual coils are sequentially connected by coil connection cables.

FIG. 4 is a diagram showing an example of connection of a linear motor car propulsion coil. In FIG. 4, 5 is a propulsion coil, 6 is a cable body of a coil connection cable, and 7 is a connection portion. The coil connection cable connects the propulsion coils 5, 5,... By inserting the connection portions 7, 7 into the terminals provided below the respective propulsion coils 5 and connecting them.

FIG. 5 shows a conventional coil connection cable. Reference numerals 6 and 7 correspond to those in FIG. 4, 8 is a ground wire, 9 is a fastening fitting, and 81 is a connection terminal of the connection wire 8. As shown in FIG. 6, the cable body 6 is provided with a cable insulator 63 on the outside of a cable conductor 61 made of a stranded conductor via an internal semiconductive layer 62, and on the outside thereof via an external semiconductive layer 64. Shield wire 65
Is attached vertically. A sheath 66 is provided on the outermost layer.

[0005] The ground wire 8 is connected to the shield wire 65, and the connection terminal 81 is connected to the outer surface of the molding material of the propulsion coil 5, which has been subjected to a conductive treatment, so that the outer surface of the propulsion coil 5 and the coil connection are formed. The charging current such as lightning surge generated in the cable for use is released to the ground.
The fastening member 9 is fixed so that the connection portion 7 does not come off from the terminal of the propulsion coil 5 even when a large vibration is applied by tightening the connection portion 7 from the outside.

[0006]

However, due to the electromagnetic force generated when the linear motor car is propelled, excessive vibration and impact force may be applied to the cable body 6, and in the above-described conventional cable for coil connection, There has been a problem that the shield wire 65 may be broken when such vibration is repeatedly applied. If the shield wire 65 is broken, the tip of the wire breaks through the sheath 66, causing a problem in waterproofing. Further, when all the shield wires 65 are broken, there is a problem that the cable main body 6 is broken down due to the influence of the cable charging current.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem and to prevent a cable main body and a circuit for flowing a cable charging current from being broken even when excessive vibration and impact force are repeatedly applied to a coil connecting cable. It is the purpose.

[0008]

According to a first aspect of the present invention, there is provided a cable for connecting a coil, wherein a cable insulator is formed outside a cable conductor and a semiconductive sheath is formed outside the cable insulator. A main body, and a contact provided at both ends of the cable main body for connecting the cable main body to the coil, and having a central portion connected to the cable conductor, and having an inner semiconductive layer, an insulating layer, and an outer A connecting portion having a semiconductive layer, a fastening member for fastening the outer periphery of the external semiconductive layer of the connecting portion to fix the connecting portion to the coil, and a connection between the fastening members at both ends; And a grounding wire provided alongside. In this way, even if excessive vibration and impact force are repeatedly applied to the coil connection cable,
The cable body and the ground line vibrate separately, making it difficult for both to break, and maintaining a circuit for passing the cable charging current.

According to a second aspect of the present invention, in the coil connecting cable, the ground wire is spirally wound with an extra length outside the cable body. In this way, the ground wire can be used without any special support,
It can be kept compact while having a degree of freedom.

According to a third aspect of the present invention, in the coil connection cable, the connection portion has the inner semiconductive layer, the insulating layer, and the outer semiconductive layer formed after connecting a contact to the cable conductor. It is characterized by having a structure. With this configuration, the contact is firmly fixed by the inner semiconductive layer, the insulating layer, and the outer semiconductive layer, so that the connection of the contact to the cable conductor can be prevented from loosening.

Further, in the coil connecting cable according to the present invention, the contact and the inner semiconductive layer are bonded with an adhesive. With this configuration, the contactor is more firmly fixed to the inner semiconductive layer, and the effect of preventing the contactor from loosening is further improved.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram showing an example of the coil connection cable of the present invention. In FIG. 1, 1
Is a cable main body, 2 is a connection portion, and 3 is a fastening member.

As shown in the sectional view of FIG. 2, the cable main body 1 has a cable conductor 11 made of a stranded copper wire covered with a cable insulator 12 made of crosslinked polyethylene or the like. A semiconductive sheath 13 is provided on the outside of the crosslinked polyethylene to mix carbon powder into the crosslinked polyethylene to impart conductivity, and further mix a weathering agent to increase the weather resistance. The semiconductive sheath 13 shields the cable body 1 and secures abrasion resistance and weather resistance of the cable body 1 as a sheath.

When extreme bending or vibration is applied to the cable main body 1, elastic EPDM (ethylene-propylene-diene terpolymer) is used as the cable insulator 12, and the cable conductor 11 is used. As for the above, if a conductor in which ultrafine copper wires are assembled is used, the resistance to vibration and bending is improved.

As described above, in the cable for connecting a coil according to the present invention, the cable body 1 is not provided with a metal shield such as a shield wire. Instead, shielding is performed by a semiconductive sheath 13, and a ground wire 4 made of a vinyl insulated wire or the like, separate from the cable body 1, is spirally wound around the cable body 1 outside the cable body 1. The cable charging current is allowed to flow therethrough with an extra length.

At both ends of the ground wire 4, fastening members 3, 3 for fastening the connecting portions 2, 2 from outside so as not to come off from the terminals of the propulsion coil 5 (FIG. 4).
Connected to. As a result, the ground wire 4 is electrically connected to the conductive film formed on the outer surface of the molding material of the propulsion coil 5 via the fasteners 3 and 3 and the external semiconductive layers of the connection portions 2 and 2. Next, this point will be described.

FIG. 3 is a sectional view of the connecting portion. In FIG. 3, reference numerals 1 to 3 correspond to those in FIG.
Is a compression sleeve of the connection portion 2, 22 is a male contact, 23 is an inner semiconductive layer, 24 is an insulating layer, 25 is an outer semiconductive layer, 51 is a molding material of the propulsion coil 5, 52 is a terminal portion,
53 is a center conductor, 54 is a female connector, and 55 is a conductive film.

The propulsion coil 5 is molded with a molding material made of epoxy resin, and has a terminal portion 52 integrally protruding from a lower end thereof. A central conductor 53 connected to the coil is provided through the center of the terminal 52, and a female connector 54 is formed at the tip of the central conductor 53. In addition, the entire outer surface of the molding material 51 includes the conductive film 55 made of a metallic paint, including the root of the terminal portion 52.
Is formed.

On the other hand, in the connection part 2, the cable insulator 1
2. A compression sleeve 21 is crimped to the cable conductor 11 of the cable body 1 from which the semiconductive sheath 13 has been stripped, and a male contact 22 is attached to the other end of the compression sleeve 21 at right angles by screw fitting. . Thereafter, processing such as welding may be performed to prevent the male contact 22 from becoming loose. Further, as means other than screw fitting the compression sleeve 21 and the male contact 22, a compression terminal may be provided integrally with the bent male contact, or the bent male contact and the cable conductor 11 may be linearly connected. May be fixed by a compression sleeve.

After that, an inner semiconductive layer 23, an insulating layer 24 and an outer semiconductive layer 25 are formed by molding from outside of the end of the cable body 1 to the male contact 22. At this time, if an adhesive is applied to a contact portion of the male contact 22 with the internal semiconductive layer 23, it is effective to prevent the male contact 22 from loosening.

As described above, in the coil connecting cable of the present invention, the ground wire 4 for flowing the cable charging current is provided separately from the cable main body 1 without providing the shield wire in the cable main body 1. did. As a result, even if an excessive vibration and impact force is repeatedly applied to the coil connecting cable, the cable main body 1 and the ground wire 4 can move separately, and both the cable main body 1 and the ground wire 4 are hardly broken.

In the above embodiment, the case where the propulsion coil 5 of the linear motor car is connected has been described. However, the coil connection cable of the present invention can be applied to connection of other coils to which excessive vibration is repeatedly applied. is there.

[0023]

Since the present invention is configured as described above, it has the following effects. That is, in the cable for coil connection according to claim 1, the cable body has a three-layer structure of a cable conductor, a cable insulator, and a semiconductive sheath, and a ground wire is formed separately from the cable body. To be provided alongside. As a result, even if excessive vibration and impact force are repeatedly applied to the coil connection cable, the cable body and the ground wire vibrate separately, making it difficult for both to break and maintaining a circuit for flowing the cable charging current.

In the coil connecting cable according to the second aspect of the present invention, the ground wire is provided spirally with an extra length outside the cable body, so that a special support is used. And the ground wire can be held compact while having a degree of freedom.

According to a third aspect of the present invention, in the coil connecting cable, the connecting portion forms an internal semiconductive layer, an insulating layer, and an external semiconductive layer after connecting a contact to the cable conductor. Therefore, the contactor is firmly fixed by the inner semiconductive layer, the insulating layer, and the outer semiconductive layer, and the loosening of the connection portion of the contactor to the cable conductor can be prevented.

Further, in the coil connecting cable according to the fourth aspect, since the contact and the inner semiconductive layer are bonded with an adhesive, the contact is more firmly attached to the inner semiconductive layer. As a result, the effect of preventing the contact from being loosened is further improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a coil connection cable of the present invention.

FIG. 2 is a cross-sectional view of a coil connection cable.

FIG. 3 is a sectional view of a connecting portion.

FIG. 4 is a diagram showing an example of connection of a linear motor car propulsion coil.

FIG. 5 is a view showing a conventional coil connection cable.

FIG. 6 is a sectional view of a conventional coil connection cable.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Cable body 2 ... Connection part 3 ... Clamping fitting 4 ... Ground wire 5 ... Propulsion coil 11 ... Cable conductor 12 ... Cable insulator 13 ... Semiconductive sheath 21 ... Compression sleeve 22 ... Male contact 23 ... Inner semiconductive layer DESCRIPTION OF SYMBOLS 24 ... Insulating layer 25 ... External semiconductive layer 51 ... Mold material 52 ... Terminal part 53 ... Female contact 53 ... Conductive film

Continued on the front page (71) Applicant 000173784 Railway Technical Research Institute 2-8-8 Hikaricho, Kokubunji-shi, Tokyo (72) Inventor Masayasu Ohara 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd. (72) Inventor Shigeru Matsumoto 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd. (72) Inventor Takehiko Yamada 3-chome, Yoshino-cho, Nishibiwashima-cho, Nishikasugai-gun, Aichi Prefecture Inside Takadake Works (72) Inventor Masao Mushiga 80, Jinji-ji, Jimaji-cho, Kaifu-gun, Aichi Prefecture Inside Takaoka Kasei Kogyo Co., Ltd. (72) Inventor Toshiaki Murai 2-8-8 Hikaricho, Kokubunji, Tokyo 38 Railway Company Inside the Research Institute of Technology (72) Inventor Ken Fujimoto 2-8-8 Hikaricho, Kokubunji-shi, Tokyo F-term in the Railway Research Institute (Reference) 5E043 CA06 EB05 5G309 FA06 FA07 LA27 5G375 AA02 BA03 BA09 BA26 BB55 BB81 CA02 CA03 CA15 CA19 CB05 CB21 CB38 CB5 5 DB16 EA17

Claims (4)

[Claims] 1. A cable insulator outside a cable conductor,
Further, a cable main body having a semiconductive sheath formed on the outside thereof, and a contact provided at both ends of the cable main body for connecting the cable main body to the coil and connected to the cable conductor at a central portion, A connecting portion having an inner semiconductive layer, an insulating layer, and an outer semiconductive layer on an outer peripheral portion; a clamp for fastening the outer peripheral portion of the outer semiconductive layer of the connecting portion to fix the connecting portion to the coil; A cable for connecting a coil, comprising a ground wire connected between the clamps at both ends and provided along the cable body. 2. The coil connection cable according to claim 1, wherein the ground wire is spirally wound with an extra length outside the cable body. 3. The structure according to claim 1, wherein the connection portion has a structure in which a contact is connected to the cable conductor, and then the inner semiconductive layer, the insulating layer, and the outer semiconductive layer are formed.
Or the coil connection cable according to 2. 4. The coil connection cable according to claim 3, wherein the contact and the inner semiconductive layer are adhered with an adhesive.