JPH05190359A - Saturable reactor - Google Patents

Abstract

PURPOSE:To provide a saturable reactor whose wound cores are easily fixed and supported without effects on magnetic saturation. CONSTITUTION:A saturable reactor 1 includes a plurality of coaxially arranged, wound cores each having a core on which strips of magnetic metal and insulator are wound together. The wound cores are integrally formed on the same center core, which is provided with through holes between adjacent wound cores and is horizontally arranged. Therefore, the spacing between wound cores is easily maintained, and they are securely supported by clamping plates 11a and 11b and a tie rod 12. In addition, the natural circulation of cooling oil 9 is smoothed at the surface of the wound cores, so that the cooling efficiency is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a saturable reactor used in a magnetic pulse compression circuit forming a part of a power supply of a high repetition pulse laser.

[0002]

2. Description of the Related Art Excimer lasers and TEA / TEMA C
An O ₂ laser or the like has several tens of KV or more with a rapid rise of voltage or current applied to the discharge part in order to obtain a uniform discharge in a laser medium or a pulsed laser beam with high peak energy when it oscillates with high repetition High voltage is required. Conventionally, there is a magnetic pulse compression circuit provided with a saturable reactor as an electric excitation circuit for obtaining such voltage and current.

FIG. 5 is a schematic sectional view of a conventional saturable reactor used in such a magnetic pulse compression circuit, and FIG. 6 is a detailed view of the section. 5 and 6, in the saturable reactor 1, a plurality of winding cores 2 are coaxially arranged side by side, and a coil 6 is provided on the outer side of the winding cores 2 to provide a required insulation distance x to the winding core 2.
It is configured by spirally winding a plurality of turns while ensuring the above, and is housed / enclosed in the tank 8 together with the oil 9 as the insulating medium and the cooling medium.

The winding iron core 2 is formed by stacking a thin strip-shaped metal magnetic material (amorphous alloy) 3 on a thin strip-shaped insulator (such as a lumirror) 4 and winding it in a spiral shape so as to have a rectangular cross section on a winding core 5a. Has been done. As a result, the insulator 4 becomes an interlayer insulator of the metal magnetic body 3, and the voltage of the high frequency pulse,
It is possible to reduce the eddy current loss that occurs in the wound iron core 2 when the current is applied.

The wound core 2 configured as described above must have a predetermined rectangular cross-sectional area in order for the saturable characteristics of the saturable reactor to satisfy the design value, but the temperature rise due to the loss generated in the wound core 2. It is divided into a plurality of pieces so as to have a predetermined cross-sectional area in order to prevent excessive size and limit the manufacturing range of the metal magnetic body 3. The plurality of winding cores 2 are coaxially arranged side by side, and a spacing piece 7 is inserted to maintain a distance between the winding cores and the winding core 5
The vertical arrangement is such that a is in the vertical direction.

As the coil 6 which constitutes the saturable reactor 1, there is used a coil 6 which is insulated and protected by winding an insulating paper on a soft copper wire having a cross-sectional area of several to ten and several square centimeters.

[0007]

The saturable reactor 1 is a magnetic switch that utilizes a saturation characteristic of an electric pulse of a few microseconds applied at a high voltage of tens of KV or more.
This is to compress the electric pulse to 0 times or more. At this time, the saturable reactor 1 is divided into a plurality of winding cores 2 so as to have a necessary cross-sectional area in order to satisfy the saturation characteristics. However, it is not possible to maintain the spacing between the winding cores or fix the winding cores themselves. It is very complicated, and the number of parts for that is increased, and the number of assembling and manufacturing steps is also increased.

Further, although the wound core 2 to which the voltage and the current of the high frequency pulse are applied can reduce the loss generated by the interlayer insulator 4, some loss occurs, so that the temperature of the wound core 2 itself rises. The temperature rise of the wound core 2 must be suppressed within a range that does not affect the saturation characteristics of the saturable reactor 1 due to appropriate heat dissipation.

As shown in FIG. 7, the heat radiating direction and the heat radiating surface of the winding iron core 2 are such that the heat generated by the loss of the winding iron core 2 has the interlayer insulating material 4 having a large thermal conductivity as a heat insulating material, and thus the laminating direction. It is difficult to radiate heat in the (radial direction), and heat is radiated in the coaxial direction. Therefore, both end surfaces of the winding core 2 in the coaxial direction serve as heat radiation surfaces, and it is necessary to suppress the temperature rise within a range that does not affect the saturation characteristics of the saturable reactor 1 due to heat transfer to the oil 9 as a cooling medium.

However, in the saturable reactor configured as described above, the heat radiation surfaces of the plurality of wound iron cores 2 which are coaxially arranged side by side and arranged vertically are oriented horizontally. In this case, when the oil 9 tries to flow from the lower side to the upper side by the (natural) circulation force, a smooth flow is obstructed between the winding cores and between the lower end faces of the winding cores, so that the heat transfer coefficient is extremely lowered. Therefore, the wound iron core 2 has a drawback that the heat radiation thereof is deteriorated and the temperature rise cannot be suppressed, which affects the saturation characteristics of the saturable reactor 1.

The present invention has been made in view of the above circumstances, and an object thereof is to simplify fixing and support of a winding iron core, to reduce the number of parts and man-hours for assembly and manufacturing, and to promote heat radiation of the winding iron core. It is to provide a stable and good saturable reactor that does not affect the saturation characteristics.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a plurality of wound iron cores, which are formed by superposing a band-shaped metal magnetic material and an insulating material and wound up spirally on a winding core. In a saturable reactor that is installed and configured by winding a coil, a plurality of winding iron cores are wound on the same winding core to integrate the plurality of winding iron cores and the winding iron cores are horizontal. It is characterized in that it is arranged horizontally and vertical through holes are provided in the core portion between the winding cores.

[0013]

According to the saturable reactor of the present invention, a plurality of winding cores are integrated by the same winding core, the distance between the winding cores can be easily maintained, and the plurality of winding cores are integrated as a whole with a tightening plate and a tie rod. Since it is tightened with, the fixing and supporting structure can be simplified. Further, since the winding cores are arranged laterally and vertical through holes are provided in the winding core portions between the winding cores, the flow of oil as a cooling medium due to the natural circulation force becomes smooth with respect to the heat dissipation surface of the winding cores. The heat can be effectively transferred and heat dissipation can be promoted.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a cross-sectional view of a saturable reactor according to an embodiment of the present invention, FIG. 2 is a view in the direction of arrow A in FIG. 1, FIG. 3 is an enlarged view of an upper cross-section of FIG. 1, and FIG. 4 is heat conduction of a wound iron core. It is sectional drawing showing a direction and a heat dissipation surface.

As shown in FIG. 1, the saturable reactor 1 of this embodiment is housed in a tank 8 together with oil 9 which is an insulating medium and a cooling medium. This saturable reactor 1
Is formed by winding a thin strip-shaped metal magnetic body (amorphous alloy or the like) 3 on the same thin strip-shaped insulator (such as a lumirror) 4 on a winding core 5b in a spiral shape as shown in FIG. It is composed of an iron core 2 and a coil 6 wound around the wound iron core 2.

Here, the wound core 2 needs to have a predetermined (rectangular) cross-sectional area so that the saturation characteristics of the saturable reactor satisfy the design value, but the temperature rise excessively due to the loss generated in the wound core 2. In order to prevent the above, and because the production range of the metal magnetic body 3 is limited, the metal magnetic body 3 is divided into a plurality of pieces so as to have a predetermined cross-sectional area.

The plurality of winding cores 2 are wound around the same winding core 5b, and are arranged in parallel coaxially by the winding core 5b and are integrally formed. At this time, strip-shaped insulating strips 10a and the like of an insulator are arranged between the plurality of wound iron cores 2 arranged coaxially in order to keep the spacing constant.

A plurality of winding cores 2 arranged coaxially side by side are arranged sideways so that the winding cores 5b are horizontal, and the winding cores 5b between the winding cores 2 serve as a cooling medium. A through hole 13 is provided so that the oil 9 of FIG. Since the wound iron core 2 configured as described above conducts heat in the stacking direction (radial direction) as shown in FIG. 4,
The heat dissipation surface will be a vertical surface.

Further, in order to simplify the fixing and supporting of the whole wound iron core 2, strip-shaped spacing pieces 10b of an insulator are arranged on both end face portions in the coaxial direction, and the tightening plates 11a, 1 are provided on the outer side thereof.
1b is provided, and the fastening plates 11a and 11b are connected and fastened by a plurality of tie rods 12 to fasten and integrally support a plurality of integrated wound cores.

As described above, in the saturable reactor of this embodiment, a plurality of divided winding cores are integrated by the same winding core, and the whole winding core is clamped and fixed by the tightening plate and the tie rod. As a result, the structure is greatly simplified, which has a great effect on reducing the number of parts and the number of assembly and manufacturing steps.

Further, the wound iron core generates heat due to its own loss and raises the temperature, but with this temperature rise, oil as a cooling medium tends to flow upward from below due to natural circulation force. At this time, the heat radiation surface of the plurality of wound cores arranged side by side in a coaxial manner and arranged laterally is perpendicular to each other, and a vertical through hole is provided in the winding core portion between the winding cores. The oil smoothly flows against the heat dissipation surface. Therefore, the efficiency of heat transfer to oil is improved and the heat radiation of the wound core can be effectively promoted, so that a stable and favorable saturable reactor can be obtained without adversely affecting the saturation characteristics.

[0022]

As described above, according to the present invention,
Multiple winding cores are integrated by the same winding core, the spacing between the winding cores can be easily maintained, and the integrated winding cores are fixed because they are tightened with a tightening plate and tie rods.
The support structure is simplified, and by vertically arranging the winding cores in the horizontal direction and providing through holes in the vertical direction between the winding cores, the natural circulation force of oil, which is the cooling medium, with respect to the heat dissipation surface of the winding cores. Since the flow becomes smooth, heat is effectively transferred and heat dissipation can be promoted. Therefore, a stable and favorable saturable reactor can be provided.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an embodiment of the present invention.

FIG. 2 is a view on arrow A in FIG.

FIG. 3 is an enlarged view of an upper cross section of FIG.

FIG. 4 is a diagram showing a heat conduction direction and a heat dissipation surface of the saturable reactor of FIG.

FIG. 5 is a schematic sectional view of a conventional saturable reactor.

6 is an enlarged view of the right cross section of FIG.

FIG. 7 is a diagram showing a heat conduction direction and a heat dissipation surface of FIG.

[Explanation of symbols]

1 ... Saturable reactor, 2 ... Winding iron core, 3 ... Metal magnetic body,
4 ... interlayer insulator, 5a ... winding core, 5b ... winding core (integral type),
6 ... Coil, 7 ... Spacing piece, 8 ... Tank, 9 ... Oil, 10
a, 10b ... Spacing piece, 11a, 11b ... Tightening plate, 12 ...
Tie rod, 13 ... Through hole.

Claims (1)

[Claims] 1. A saturable reactor constructed by arranging a plurality of wound iron cores, which are formed by stacking a strip-shaped metal magnetic material and an insulator on top of each other and wound in a spiral shape, coaxially in parallel and winding a coil. A plurality of winding cores are wound on the same winding core to integrate the winding cores, and the winding cores are horizontally arranged so that the winding cores of the winding cores are horizontal. Saturable reactor characterized by having a through hole.