JPS5911608A - Air-core reactor - Google Patents

Abstract

PURPOSE:To provide an air-core reactor with a vibrational noise generation preventing means offering a fastening condition excellent in durability and reliability, by providing a taping part for fixing a fastening auxiliary member, thereby to firmly secure the winding starting end of a binding tape. CONSTITUTION:A fastening auxiliary member 4 is formed in U-shape and therefore can be easily and firmly engaged with of each of end parts of a conductor 11. At a taping part 6 for fixing the member 4, the winding starting end of a binding tape 3 is inserted into a bore 7 in the fastening auxiliary member 4 and then drawn out from a bore 8 so as to be wound on the core part of the member 4 between the bores 7, 8. The winding starting end of the thus wound binding tape 3 is in press contact with the conductor 11 at an inner side surface of the fastening auxiliary member 4, and the binding tape 3 is wound in layers at an outer side surface of the member 4. Accordingly, the binding tape 3 is firmaly secured.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an air-core reactor used in a large-capacity rectifier using a thyristor, etc., and in particular, to prevent the generation of vibration noise between conductors caused by electromagnetic force. The present invention relates to an air-core reactor in which an insulating film or an El-sa is inserted between conductors.

[Technical background of the invention]

In an air-core reactor, when a rectangular wave or an alternating current flows through its conductors, an attractive force or a repulsive force acts between the conductors, which may generate vibration noise. Therefore, in order to prevent the generation of the above-mentioned vibration noise, there have conventionally been methods in which an insulating sweep is inserted between the conductors, and a portion of the conductor and the insulating sweep are fastened together using a bind chain.

FIG. 1(,)(b) is a diagram showing an example of such a conventional air-core reactor. In the figure, l is an air-core reactor main body, which is a helically wound conductor 11 having a rectangular cross section. A spacer 2 is provided between the conductors 1 and 2.
is inserted.

The conductor 11 and the insulating sweep 2 are connected to each other by wrapping a bind tape 3 around them.

In the conventional example shown in the figure, the above-mentioned fastening points are provided at 3 fi')i locations.

[Problems with background technology]

In the conventional structure having the above-mentioned structure, the binding chips 703 tend to break due to stress concentration at the edge portions 11a at both ends of the rectangular conductor 11, and lack durability.

FIG. 2 shows the strength of the bind tape 3 and the edge portion 11a.
This shows the relationship between the shape and the shape.

In the figure, the vertical axis is the strength reduction rate of the bind chi 7°3 at the edge portion 11h, with the original strength being 1. Further, C and R on the horizontal axis are the dimensions of the chamfering applied to the edge portion 11m, where C indicates the planar shape and R indicates the degree of the circular arc-shaped chamfer. As can be seen from FIG. 2, when C and R are O, that is, when the edge portion 11h is not chamfered at all, the strength of the bind tape 3 becomes the original strength, and when C and R are 1 m++, each is A. The strength will be approximately. It can be seen that the strength of the bind tape 3 is hardly improved even if the value of C is set to 1 m or more, whereas the strength of the bind tape 3 is further improved when the value of R is set to 1 m or more.

However, if the arcuate chamfer is made larger than the edge 11a, the cross-sectional area of the conductor 1 will locally decrease, resulting in higher current density and increased heat generation, leading to a decrease in efficiency. .

In addition, generally, the winding start end of the bind tape 3 is adhered to the conductor 11 with adhesive tape, etc., but with such means, it is difficult to apply a large tension when starting to wind the bind tape 3 around the conductor 11 and the insulating spacer 2. I can't. Therefore, as the binding tape 3 is wound overlappingly, wrinkles occur at the beginning of the winding due to the tightening of the bind tape 3, and as a result, the connection between the conductor 11 and the insulating strainer 2 becomes unstable, resulting in a lack of reliability. There was a problem.

[Purpose of the invention]

It is an object of the present invention to solve the above problems, to provide a fastening system that can accurately fix the winding start end of a bind tape, prevent stress concentration from occurring when winding the bind tape, and provide fastening with excellent durability and reliability. An object of the present invention is to provide an air-core reactor equipped with means for preventing the generation of vibration noise.

[Summary of the invention]

In order to achieve the above object, the present invention is characterized by the following configuration. That is, in the present invention, a plurality of insulating spacers are installed between the conductors of an air-core reactor main body in which a rectangular conductor is spirally wound, parallel to the axis of the main body in a part of the circumferential direction of the main body. These are inserted so as to be arranged in the same manner as shown in FIG. A fastening auxiliary member having a rounded part and a tape fastening part for fastening the winding start end of the bind tape on the center wall is engaged, and the winding start end of the bind tape is connected to the tape fastening part of the fastening auxiliary member. After fixing, this bind tape is wound around the outside of the fastening auxiliary member, the vibration noise generation prevention body, and the conductor, and the above-mentioned kings are tied together, thereby avoiding stress concentration on the bind tape, and also preventing adhesive tape, etc. The present invention is characterized in that the winding start end of the bind tape can be accurately fixed without using.

[Embodiments of the invention]

FIG. 3(,)(b) is a diagram showing the configuration of an embodiment of the present invention. In the figure, l is the air core reactor body,
A conductor 11 having a rectangular cross section is spirally wound. Insulating spacers 2 are aligned and inserted between the conductors 11, and fastening auxiliary members 4 made of an insulating material such as synthetic resin are attached to both ends of the conductors 11. Then, a bind tape 3 is wound around the insulating spacer 2, the fastening auxiliary member 4/and the conductor 2, and the above-mentioned king is integrally fastened.

FIGS. 4(a) and 4(b) show the fastening auxiliary member 4. FIG. That is, this fastening auxiliary member 4 is formed in a U-shape, has rounded outer corner portions 5, and has rectangular holes 7 and 8 bored in the central wall as tape fixing portions for fixing the start end of the bind tape. has been done. The holes 7 and 8 have a width that allows the bind tape 3 to be inserted therethrough.

The present embodiment configured as described above has the following effects. First, since the fastening auxiliary part side 4 is formed in a U-shape, it can be easily and precisely engaged with both ends of the conductor 1. Or the tape fixing part of the member 4! On the other hand, the winding start end of the bind tape 3 is inserted into the hole 7 of the fastening auxiliary member 4 as shown in FIG.

The winding start end of the bind tape 3 wound in this manner comes into pressure contact with the conductor 11 on the inner surface of the fastening auxiliary member 4, and since the bind tape 3 overlaps on the outer surface, it is accurately fixed.

FIG. 6 is a diagram showing the main parts of this embodiment in a fastened state, with the bind chi f3 wound around the outside of the insulating spacer 2 and the fastening auxiliary member 4. As can be seen from the figure, in this embodiment, the bind tape 3 is wound in a curved line at the corner portion 5, so that almost no stress concentration occurs in the bind tape 3. Further, in this embodiment, since no shape change such as chamfering is applied to the conductor 11, the current density does not become high at the edge portion 11h of the conductor 1, and therefore there is no fear of a decrease in efficiency.

Note that the present invention is not limited to the above embodiment.

For example, the tape fixing part of the fastening auxiliary member may have a structure in which sawtooth-like unevenness is arranged on the core part of the outer surface of the central wall, and only one hole 7 is provided, and it may not be a complete through hole. It may also be a notch in which the end of the tape is inserted.

〔Effect of the invention〕

According to the present invention, the winding start end of the bind tape is accurately fixed by the tape fixing portion of the fastening auxiliary member without using an adhesive tape or the like. Moreover, since the fastening auxiliary members having rounded outer corners are attached to both ends of the conductor of the air core reactor main body, the twin tape can be wound without causing stress concentration. As a result, it is possible to provide an air-core reactor equipped with vibration noise generation prevention means that exhibits a fastened state with excellent durability and reliability.

[Brief explanation of the drawing]

Figure 1 (a) and (b) are diagrams showing an example of a conventional air-core reactor. Figures (,) are a front view, Figure (b) is a side view, and Figure 2 shows the strength of the bind tape and the conductor. FIGS. 3 to 6 are diagrams showing the relationship between the shape of the edge portions at both ends, and are diagrams for explaining an embodiment of the present invention. FIG. 3(a) is a front view, and FIG. ) is a side view, FIG. 4 (,) is a front view showing the configuration of the fastening auxiliary member, and FIG.
5 is an enlarged sectional view showing the fixed state of the winding start end of the bind tape, and FIG. 6 is an enlarged sectional view showing the winding state of the bind tape at the point where the fastening auxiliary member is attached. . J...Air core reactor body, 1 No....Conductor, 11h
... Edge part of the conductor end, 2 ... Insulating cover, 3
... Bind tape, f... Fastening auxiliary member, 5...
・° Chisel 2

Claims (1)

[Claims] (1) An air-core reactor body in which a rectangular conductor is spirally wound, and a plurality of insulating sheathers arranged parallel to the axis of the body in a part of the circumferential direction of the body between the conductors. A vibration noise generation prevention body inserted into the body, a fastening auxiliary member attached to both ends of the main body in a region where the vibration noise generation prevention body is inserted, and a fastening auxiliary member and the vibration noise generation prevention body and a bind tape that is integrally fastened together with the conductor of the main body, and the fastening auxiliary member is formed in a U-shape so as to engage with the conductor located at both ends of the main body, and has a bind tape attached to a corner portion of the outer surface. What is claimed is: 1. An air-core reactor characterized in that it is rounded and has a tape fixing part on the center wall for fixing the spring end of the bind tape.