JPH0666208B2 - Air core coil - Google Patents

Description

The present invention relates to an air-core coil, and more particularly to an air-core coil used in a large current transformer.

[Conventional technology]

FIG. 4 is a schematic view of a conventional air-core coil (Rogowski coil), in which a toroidal-shaped coil is made in the air core and rewound by a conventional forming method. FIG. 5 shows a conventional air-core coil, FIG. 5 (a) is a perspective view thereof, and FIG. 5 (b) is a sectional view taken along line AA of FIG. 5 (a). Further, FIG. 5 shows a coil 3 wound and unwound on a non-magnetic core 4. The rewinding wire 2 projects outside the winding wire 1, and the rewinding wire 2 and the winding wire 1 overlap with each other at the overlapping point 6
Are superposed on. The winding wire 1 is wound around the core 4 along the closed curved surface 4a of the core 4, and the rewinding wire 2 is wound around the coil by the winding wire 1 for one round, and then the end of the winding wire 1 is wound around the coil 3. It returns to the winding start point along. In other words, the toroidal coil is manufactured by using the air core or the air core 4, and at the winding end point, the coil 3 is passed through the outside of the coil 3 to rewind substantially one turn with respect to the toroidal axis.

[Problems to be Solved by the Invention]

As described above, in the conventional example, the rewinding process for rewinding the rewinding wire is added to the winding process for winding the winding wire, and when the air-core core is used, the unwinding process is performed as it is. There was a problem that the return line protruded outside the coil and the storage was defective. There is also a problem that an error is likely to occur due to the influence of the external magnetic field.

The present invention has been made to solve the above-mentioned problems, and the winding and rewinding of the air-core coil are performed at the same time, the rewinding step is omitted, and the rewinding wire holding means is used. The purpose of the present invention is to improve the storage of the return wire and to obtain an air-core coil that is not easily affected by an external magnetic field.

[Means for Solving the Problems]

Therefore, in the present invention, a non-magnetic core having an arbitrary closed curved surface, a winding wire wound along the closed curved surface of the core, and a winding start point at the end of the winding wire along the coil. In order to achieve the above object, an air-core coil having a rewinding wire for returning to a coil is provided with a rewinding wire holding means that is recessed along the outer periphery of the core and holds the rewinding wire. It is a thing.

[Action]

In the air-core coil according to the present invention, the winding wire is wound at the same time while holding the unwinding wire along the unwinding wire holding means that is recessed along the outer periphery of the non-magnetic coil. One step (rewinding step) is shortened, the rewinding wire is properly stored, and the winding wire is stabilized without applying a load to the rewinding wire.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

Drawing FIG. 1 is a schematic view of an air-core coil which is an embodiment of the present invention, FIG. 2 shows an air-core coil which is also an embodiment of the present invention, and FIG. 2 (a) is a perspective view thereof. Figure (b)
FIG. 3 is a sectional view taken along line AA in FIG. FIG. 3 shows a modification of this embodiment, FIG. 3 (a) is a perspective view thereof, and FIG. 3 (b) is an AA sectional view of FIG. 3 (a).

In the figure, the same or corresponding components as in the conventional example are represented by the same reference numerals.

In FIGS. 1 to 3, 1 is a winding wire of the air-core coil 3, which is a winding wire wound around the core 4 along the closed curved surface 4 a of the core 4. Reference numeral 2 is a rewinding wire that returns the end of the winding wire 1 to the winding start point along the coil 3, and holds the winding wire at the same time while holding it along the groove 5 (described later) which is the rewinding wire holding means Y. It is to be wrapped.

In FIG. 2 of the drawings, the groove 5 which is the rewinding wire holding means Y is recessed in the central portion along the entire outer circumference of the core 4, and the rewinding wire 2 is provided on the groove bottom 5a of the groove 5 in FIG. It is inserted and stored as shown. Further, the groove 5 is configured such that the rewinding wire 2 fitted in the groove bottom 5a coincides with the center line of the coil cross section (FIG. 2 (b)) of the winding wire 1.

Next, FIG. 3 shows a modification of the above embodiment. In FIG. 3 of the drawings, the groove 5 as the rewinding wire holding means Y is
Along the entire surface of the end face 5b of the core 4, a recess is provided in the center thereof, and the rewinding wire 2 is fitted and stored in the groove bottom 5a as in the case of FIG. Further, in the groove 5, the unwinding wire 2 fitted in the groove bottom 5a has a coil cross section of the winding wire 1 (center point of FIG. 3 (b)).
Is configured to match.

Next, a method of forming this air-core coil will be briefly described with reference to FIG.

In FIG. 2 of the drawings, by winding the rewinding wire 2 along the groove bottom 5a of the groove 5 recessed in the outer periphery of the core and holding it at the same time, the winding wire 1 is wound around the core 4 by the winding machine. The air-core coil 3 can be formed.

〔The invention's effect〕

As described above, according to the present invention, the rewinding step can be omitted, and there is an effect of improving the accommodation of the rewinding wire. Furthermore, the rewinding wire is aligned with the center line of the coil cross section of the winding wire. In the case of the rewinding holding means provided, there is an effect that the influence of the external magnetic field can be canceled out.

[Brief description of drawings]

1 is a schematic view of an air-core coil which is an embodiment of the present invention, FIG. 2 shows an air-core coil which is also an embodiment of the present invention, and FIG. 2 (a) is a perspective view thereof. FIG. 2B is a sectional view taken along line AA of FIG. FIG. 3 shows a modification of this embodiment, FIG. 3 (a) is a perspective view thereof, and FIG. 3 (b) is an AA sectional view of FIG. 3 (a). FIG. 4 is a schematic view of a conventional air-core coil, FIG. 5 shows the same conventional air-core coil, FIG. 5 (a) is a perspective view thereof, and FIG. 5 (b) is FIG. 5 (a). FIG. 1 ... Winding wire 2 ... Rewinding wire 3 ... Coil 4 ... Core 4a ... Closed curved surface 5 ... Groove Y ... Rewind holding means In the drawings, the same reference numerals indicate the same or corresponding portions. .

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Hirotsune 1-8 Midoricho, Fukuyama-shi, Hiroshima Mitsubishi Electric Corporation Fukuyama Plant (72) Inventor Akira Fukuya 1-157 Miyashita, Sagamihara-shi, Kanagawa Saishi Hishi Electronic Chemistry Co., Ltd. (72) Inventor Morio Machida 1-157 Miyashita, Sagamihara City, Kanagawa Prefecture

Claims (1)

[Claims] 1. A non-magnetic core having an arbitrary closed curved surface, a winding wire wound along the closed curved surface of the core, and a winding for returning an end of the winding wire along a coil to a winding start point. An air-core coil having a rewind wire, the rewind wire holding means being recessed along the outer periphery of the core for holding the rewind wire.