JPH0483317A - Reactor - Google Patents

Abstract

PURPOSE:To enable eddy current loss due to fringing flux to be reduced and reliability to be improved by increasing life of an insulator due to reduction in overheating of a coil by placing a coil conductor which is wound around core leg with a void along the fringe flux which is generated by the void being in parallel to a longer direction of a section of the coil conductor. CONSTITUTION:A core 1 has one void 3 at a central leg 1a. Since fringing flux phi2 due to this core 1 is in semi-circular shape with the void 3 as a center so that a wide part D of a rectangular conductor 5 is placed in parallel to this flux line and a coil 2 is placed in parallel to the fringing flux phi2 and is wound. Or voids 3a-3c are provided at a central leg 1a of the core 1, a compensating coil 6 is wound around the central leg 1a, and a normal coil 2 is wound around the outside. With the compensating coil winding starting terminals 7-9 and winding end terminals 10-12 of the coils 6a-6c are mutually connected and the coils 6a-6c are connected in parallel. Fringing flux does not intrude into the normal coil side 2, thus enabling local loss and overheating to be avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a reactor, and particularly to a reactor having a void in its core leg.

[Prior art] Figure 6 is, for example, published by Denkishoin [Transformer design and construction method J
A reactor having a void in the core leg described on pages 305 to 306 is shown, and has voids (3a) to (3c) in the core leg (la) at the center of the core (1).
A coil (2) is wound around a). coil(
2), as shown in FIG. 7, uses a rectangular single conductor or double conductor and is often wound into a cylindrical shape. In this way, the magnetic flux φ1 of the core leg (la) of the axle passes through the center of the core leg (1a) as shown in FIG. 8, but since there are gaps (3a) to (3c), as shown in the figure, A fringing magnetic flux φ2 is generated, and the fringing magnetic flux φ2 protrudes outside the core leg (1a). If a coil (2) as shown in FIG. 7 is used in such a situation, the fringing magnetic flux φ2 crosses the width direction of the coil copper wire, as shown in FIG. 9. That is, since the area of the conductor perpendicular to the direction of the magnetic flux φ2 is large, the eddy current loss becomes large. FIG. 10 shows a coil in which a coiled copper wire (4) is wound edgewise (D>t), and this also exhibits the same behavior as described above.

[Problems to be Solved by the Invention] As described above, the conventional glue axle causes eddy current loss in the coil, causing abnormal overheating of the coil. This shortens the lifespan of the insulator that forms the coil, reducing reliability. In addition, increased losses reduce efficiency.

This invention was made to solve the above-mentioned problems, and aims to provide a reactor in which the coil is not affected by fringing magnetic flux generated from the gap in the core leg.

[Means for Solving the Problems] A reactor according to a first aspect of the present invention has a coil in which a wide surface of a rectangular conductor is wound in parallel to the direction of fringing magnetic flux.

Further, the reactor according to the second invention has a method in which a plurality of coils are wound around a gap in a core leg having fringing magnetic flux, the beginnings of the windings are connected to each other, the ends of the windings are connected to each other, and the coils are connected to each other at the ends thereof. It has a compensation coil around which a normal coil is wound.

[Function] In the first invention, the fringing magnetic flux generated in the core leg gap enters the narrow direction of the rectangular conductor.

In the second invention, the fringing magnetic flux crosses the compensation coil, and the current that cancels it circulates between each of the wound compensation coils, so the fringing magnetic flux does not cross the normal coil. .

[Example] Figures 1 and 2 show an example of the first invention. In Figure 1, the iron core (1) has a gap (3) of lf1g in the central leg (la). do. As shown in Fig. 2, the fringing magnetic flux φ caused by the iron core (1) in such a structure forms a semicircular arc with the air gap (3) at its center. Place the wide part of the

The coil (2) in FIG. 1 represents a coil shape that is wound while being arranged in parallel with the above-mentioned fringing magnetic flux φ.

With the above configuration, the fringing magnetic flux φ2 is transmitted through the rectangular conductor (
5) Since the width is narrow, the conductor area is small and eddy current loss is reduced.

Note that the air gap (3) is not limited to one location, but may be multiple, and the conductor is fringed with magnetic flux φ.

It includes a coil stem whose wide part is wound in parallel with the coil.

3 to 5 show an embodiment of the second invention, and FIG. 3 shows gaps (3a) to (3) in the central leg (1a) of the iron core (1).
c) and winding the compensation film (6) around the central leg (la). A normal coil (2) is wound around the outside.

As shown in FIG. 4, the compensation coil (6), for example, connects winding start terminals (7) to (9) of three coils (6a) to (6c).
, winding end terminals (10) to (12) are connected to each other to connect the coils (6a) to (6c) in parallel. An equivalent circuit of such a coil (6) is shown in FIG.

With the above configuration, the magnetic flux passing through the three fills (6a) to (6c) only acts as the main magnetic flux of the axle, but the fringing magnetic flux is transmitted through the coil (6a).
~(6c), thus creating a counteracting ampere turn through each coil (6a)~(6c), causing the current to flow partially.

For this reason, the usual fringing magnetic flux does not enter the coil (2) side, and local loss and overheating can be avoided.

Although three coils are shown in the above embodiment, all configurations of two or more coils are included.

[Effects of the Invention] As described above, according to the first aspect of the present invention, since the wide direction of the coil conductor is wound parallel to the fringing magnetic flux, the eddy current loss due to the fringing magnetic flux can be reduced, and the coil conductor can be wound in parallel with the fringing magnetic flux. Reliability can be improved by increasing insulator life due to reduced overheating, and efficiency can be increased by reducing losses.

Further, according to the second aspect of the present invention, a compensation coil connected in parallel around the core leg having a gap and having the winding start and winding end open is wound, so that the same effect can be obtained.

[Brief explanation of the drawing]

FIGS. 1 and 2 show an embodiment of the first aspect of the present invention, with FIG. 1 being a schematic cross-sectional view and FIG. 2 being a partial cross-sectional view for explaining the operation. 3 to 5 show an embodiment of the second invention, in which FIG. 3 is a schematic cross-sectional view, FIG. 4 is a schematic perspective view of a compensation coil, and FIG. 5 is an equivalent circuit diagram. 6 to 10 show a conventional glue handle, FIG. 6 is a schematic cross-sectional view, FIG. 7 is a cross-sectional view of a coil conductor, FIG. 8 is a partial cross-sectional view for explaining the operation, and FIG. 9 is a cross-sectional view of a coil conductor. FIG. 10 is a schematic diagram for explaining the operation. (1)... Iron core, (la)... Iron core leg, (2)... Koinobe (3), (3a), (3b), (3c)
... air gap, (5) -- fill conductor, (6) ... compensation coil. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (2)

[Claims] (1) A reactor in which a coil conductor wound around an iron core leg having a gap is arranged so that the longitudinal direction of the cross section of the coil conductor is parallel to the fringing magnetic flux generated by the gap. (2) A coil is wound around a core leg with a gap, and a plurality of other coils are wound inside this coil along the core leg, these other coils are connected in parallel, and the winding starts and winds. A reactor equipped with a compensation coil whose end is open.