JPH0414906Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a magnetic core for a saturable reactor used to control the output voltage of a power supply device for communication equipment and the like.

[Conventional technology]

The conventional magnetic core for a saturable reactor uses two annular magnetic cores 1 and 2 as shown in Fig. 4, and the control windings 3 to saturate the magnetic path are wound in large numbers so that they have opposite polarities. It's been turned.

Both magnetic cores 1 and 2 around which the control winding 3 is wound are overlapped and integrated, and a reactance winding 4 is further wound around the cores so that the magnetic fluxes of the control winding 3 and the reactance winding 4 are orthogonal to each other. .

[Problem that the invention attempts to solve]

Therefore, the number of man-hours required to wind the windings around the magnetic cores 1 and 2, particularly the control winding, is large, resulting in a high cost. Furthermore, in order to wind the control winding 3 several hundred times around the annular magnetic cores 1 and 2, the magnetic core needs to be made larger, making it difficult to downsize.

[Means for solving problems]

In view of the above-mentioned conventional technology, the present invention connects a cylindrical center leg and left and right legs with a yoke to form a magnetic core having an E-shaped magnetic path, and assembles this magnetic core symmetrically in each leg. A separately produced bobbin-type control winding is inserted into the center leg, and the reactance winding can be wound perpendicularly to the control winding through the through hole of the center leg.

〔Example〕

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

1 and 2 show a saturable reactor using a magnetic core according to the present invention, in which a pair of magnetic cores 10 having an E-shaped magnetic path, a control winding 11, and a reactance winding 12 are shown.
It is formed by

As shown in FIG. 3, the magnetic core 10 having an E-shaped magnetic path has a horizontal line between the upper ends of a cylindrical center leg 13 such as a cylinder or square tube, and left and right legs 14 that are plate-shaped or cylindrical. It is connected by a yoke part 15. The yoke portions 15 are two yoke portions that protrude symmetrically from both sides of the upper end of the center leg 13 horizontally outward, and each leg 14 is connected and fixed downward to the tip of both yoke portions 15. There is.

At the center of the upper end surface of the center foot 13, which has a hole 16 penetrating therethrough, the hole is perpendicular to the length direction of the yoke part 15 and has a depth that is equal to or greater than the plate thickness of the yoke part 15. A notch 17 is formed.

Since the above-mentioned magnetic cores 10 are used as a pair, they are fixed symmetrically at the end faces of the respective legs 13 and 14, and the through holes 16 of both central legs 13 are in communication with each other.

The control winding 11 that brings the center foot 13 into a DC magnetic saturation state is made by winding a large number of windings around a bobbin.
It is inserted into the outer periphery of the central leg 13.

In addition, the reactance winding 12, which is normally wound several times and controls the high-frequency current, is wound between the outside through the through hole 16 of the central foot 13, and the control winding 11 and the reactance winding 13 are orthogonal to each other. It is becoming.

In the above configuration, when the control winding 11 is excited and a magnetomotive force is applied to the center leg 13, the magnetic paths of the center leg 13, the yoke 15, and the left and right legs 14 become magnetically saturated. The section is designed to have a smaller cross-section than the others, so it is completely saturated. Therefore, the reactance winding 12 exhibits high magnetic resistance to the magnetomotive force caused by the alternating current applied to the reactance winding 12, and there is little change in magnetic flux.
The AC impedance of is significantly reduced.

As mentioned above, the notch 17 is formed in the yoke part 15, but the part of the yoke part 15 through which the reactance winding 12 passes has a large cross-sectional area of the magnetic path due to its structure, and the magnetic flux of the central foot 13 is are the left and right yoke parts 15
If there is no notch 17, it would be difficult for the control winding 11 to bring this part into a magnetically saturated state. foot 13
and the yoke part 15 and center leg 13 where magnetic saturation is not sufficient.
, the change in magnetic flux generated by the magnetomotive force caused by the alternating current in the reactance winding 12 increases, and the alternating current impedance of the reactance winding 12 exhibits a high value, and its function as a saturable reactor is significantly reduced. descend.

As mentioned above, the depth of the notch 17 is the same as or greater than the plate thickness of the yoke part 15, so the area of the joint between the center leg 13 and the yoke part 15 is small, and the winding of the reactance winding 12 is Since the yoke part 15 does not pass through the wire, the AC impedance of the reactance winding 12 is no longer influenced by the yoke part 15 and is determined only by the center leg 13.
If it is sufficiently magnetically saturated, its value will be significantly small.

If there is no notch 17, the change in AC impedance due to this reactance winding 12 will be a fraction of that
However, the cut 17 reduces this change to 1/100 to 1/1000, making it possible to obtain a high-performance saturable reactor.

In the above explanation, an E-type magnetic core has been described, but by applying the present invention to a pot-shaped core, the same can be used as a saturable reactor magnetic core.

[Effect of idea]

As explained above, according to the present invention, a magnetic core having a small E-shaped magnetic path can be used in the saturable reactor, a small bobbin-type control winding can also be used, and the effective magnetic Since the path length can be shortened, it is possible to obtain a small and economical magnetic core for a saturable reactor. Further, by simply adding simple processing to the magnetic core, it is possible to obtain performance equivalent to or better than when two annular magnetic cores are used.

[Brief explanation of the drawing]

Fig. 1 is a side view of a saturable reactor using the magnetic core according to the present invention, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, Fig. 3 is a partially cutaway front view of the E-type magnetic core, and Fig. 4 is a partially cutaway front view of the E-type magnetic core. The figure is a principle diagram of a conventional saturable reactor. 10 is a magnetic core having an E-type magnetic path, 11 is a control winding, 12 is a reactance winding, 13 is a center leg, 1
4 is the left and right foot, 15 is the yoke, 16 is the through hole, 17
is the depth of cut.

Claims (1)

[Scope of utility model registration request] A horizontal yoke part 15 connects the cylindrical central leg 13 with a through hole 16 inside and the upper ends of the left and right legs 14, and a yoke part 1 is provided at the center of the upper end surface of the central leg 13.
Each leg 13,
A control winding 11 is provided on the central leg 13, and a reactance winding 12 that is orthogonal to the control winding 11 is inserted into the through hole 16 in which both the central legs 13 communicate. A magnetic core for a saturable reactor, characterized in that it can be passed through.