JPS6376408A - Three-phase leakage transformer - Google Patents

Abstract

PURPOSE:To facilitate regulating a leakage reactance in a wider range by a method wherein secondary windings are wound on the center parts of leg cores and primary windings are divided and wound on the upper parts and the lower parts of the leg cores and magnetic rings are provided between the primary windings and the secondary windings. CONSTITUTION:Triangular yoke cores 2 and 2' composed of ring-shape laminated cores which are subjected to a shaping heat treatment to have triangular shapes and leg cores 1-1'' composed of annular laminated cores on which cut grooves 3-3'' are formed along the axial direction constitute magnetic paths. Secondary windings 5-5'' are provided on the respective center parts of the leg cores 1-1'' and, further, primary windings are divided into two respective parts 4-4'' and 6-6'' and are wound on the parts of the leg cores 1-1'' above and below the secondary windings 5-5'' and magnetic rings 7-7'' and 8-8'' are provided between both the windings. With this constitution, as the cut grooves are provided on the leg cores, circulating currents induced in the leg cores are suppressed and, as the magnetic rings are provided between both the windings and their thicknesses can be varied, magnetic couplings can be further improved and regulation in a wider range can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Application The present invention relates to a three-phase butt-type leaky transformer, and more specifically, the present invention relates to a three-phase butting type leaky transformer, and more specifically, the present invention relates to a three-phase matched leakage transformer, and more specifically, it is comprised of two annular laminated iron cores that have been heat-treated for deformation into a triangular shape.
A magnetic path is formed by three triangular yoke cores and three leg cores each consisting of an annular stratified core provided between the vertices of the yoke core and having cutting grooves in the axial direction. The central part in the axial direction is equipped with a secondary winding,
In addition, the primary winding is divided and packaged in both the upper part and the lower part of this secondary winding to form a three-phase structure, and furthermore, a This invention relates to a three-phase matching type leakage transformer configured to have magnetic rings attached to each of two locations so that the value of the leakage reactance of the transformer can be greatly adjusted.

Conventional Technology and Problems In conventional leakage transformers, the primary and secondary windings mounted on the leg cores are wound concentrically, and there are multiple ends between these windings. Some devices are equipped with a magnetic material that forms either a leakage magnetic path with an open band or a leakage magnetic path with both ends open, but in order to adjust the reactance, it is necessary to Since the position or thickness must be changed, it is necessary to remove the winding from the leg iron core, which has the disadvantage of poor workability.

In addition, there is a method that inserts a magnetic flux nozzle core between the secondary winding and the secondary winding to create a closed circuit, but in a three-phase configuration, the structure is complicated and the external dimensions are large. was there.

Furthermore, in the leakage transformer disclosed in Patent Application No. 157361 of 1982, there is one in which one stage of magnetic ring is provided between the primary winding and the secondary winding mounted on the core leg. Although the value of the transformer's flux actance can be increased, it has been difficult to adjust it over a wide range.

Solution and Effect In the three-phase matched leakage transformer of the present invention, a secondary winding is mounted in the center part of the leg core, and the secondary winding is mounted in two places, an upper part and a lower part of the secondary winding. In either case, the primary winding is divided and packaged, and two magnetic rings are attached in two stages between each of these two windings. This two-stage breakable ring further improves the magnetic coupling, and by changing the thickness of the magnetic ring, leakage reactance can be adjusted over a wider range.

Embodiment In FIGS. 1 and 2, the yoke core 2 and τ are composed of an annular stratified core made of silicone steel plates and steel pieces concentrically arranged in a spiral shape with the required width. It is obtained by applying pressure in the center direction to deform it into a triangular shape, and then subjecting it to heat treatment. The leg cores 1, 1' and 11 are laminated from annular laminated cores similar to those described above, and cutting grooves 3.degree. 3' and 31 are provided in the axial direction of these leg cores, respectively. The leg cores 1, 1' and 19 are arranged triangularly between the vertices of the yoke cores 2 and 2' to form a three-phase magnetic path.

In Figures 3 and 4, secondary windings 5.5' and 5'
are mounted on the central portions of the leg cores 1.1' and 11, respectively, and the upper and lower portions of the secondary windings are
One set of primary windings 4, 4' and 4' and another set of primary windings 6, 6' and 6'' are divided and mounted at each location. One set of magnetic rings 7.7' and 7' and another set of magnetic rings 8.8' and 8' are mounted.-Primary windings 4, 4' and 49.Secondary winding 5.'
and 5', -order windings 6, 6' and 6', magnetic wire/gua, 7' and 7' and 8, 8' and 81 each constitute a three-phase leakage reactance generating mechanism. do.

In FIGS. 5 and 6, one magnetic ring is composed of one ring 9 and 9' and one ring 91 and 9'' of magnetic material, which are divided by cut mating spaces 12 and 12', An insulating ring is provided between these rings 9 and 9' and rings 9' and 9''. One insulating ring, like the magnetic ring described above, is composed of insulating rings 10 and 10' divided by cut mating spaces 13'' and 13'. Each magnetic ring has a thickness of The ring fixing hole 11 fixes the ring in a predetermined position.

Effects of the Invention As shown in Fig. 1, by providing cutting grooves in the axial direction of the leg core, it is possible to suppress the circulating current generated in the leg core, and as shown in Fig. 4, the circulating current generated in the leg core can be suppressed. The secondary winding is divided into two sets of primary windings in an upper part and a lower part of the secondary winding, and furthermore, two sets of magnetic rings are placed between each of these two windings. By changing its thickness after mounting, the magnetic coupling can be further improved and a wide range of adjustment possible.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the core magnetic path configuration of an embodiment of the three-phase matching type leakage transformer of the present invention. FIG. 2 is a side view of the core magnetic path configuration shown in FIG. 1. FIG. 3 is a plan view showing the configuration of the primary winding, secondary winding, and magnetic ring of the embodiment shown in FIG. 1. FIG. 4 is a side view of the configuration shown in FIG. 3. 5 and 6 are a plan view and a side view, respectively, showing details of the magnetic ring shown in FIG. 3. In the figure, 1tl'wl': Leg core 2, 2/ @ yoke core 3, 3/, 39: Cutting groove 4.4', 4', 6, 6', 61: Next winding s
, s', s': Secondary windings 7.7', 7', 8, 8', 8' = magnetic rings 9, 9
1, 91, 9111: Single ring of magnetic material 10, lO'
: One wheel of insulator

Claims (2)

[Claims] (1) A magnetic path is constituted by a triangular yoke core made of an annular layered core that has been heat-treated for deformation into a triangular shape, and a leg core made of an annular layered core with cutting grooves in the axial direction. A secondary winding is placed in the center of each of the
In addition, both windings are mounted so that the primary winding is divided and arranged in two places, the upper part and the lower part of the secondary winding, and a magnetic ring is placed between each of these two windings. Installed three-phase matching type leakage transformer. (2) The three-phase matched leakage transformer according to claim 1, wherein the annular layered iron core has a silicon steel strip and a steel piece concentrically arranged in a spiral shape.