JPH04165610A - Saturable reactor - Google Patents

Abstract

PURPOSE:To improve insulating characteristics by mounting a shielding ring corresponding to the corner of an insulating case at the ends of a winding core and a winding jig in a saturable reactor. CONSTITUTION:In a saturable reactor 10, a winding core 11 and a winding jig 12 are mounted in close contact with the inner and outer peripheries of a winding core 2, and electrically connected to the core 2. Conductive shielding rings 13 are integrally formed with the core 11, the jig 12 at the upper and lower ends of the core 11, the jig 12, i.e., at the positions corresponding to the corners 3a of an insulating case 3. As a result, the four rings 13 are electrically connected to the core 2 through the core 11 and the jig 12. An electric field is alleviated by the rings 13 at the corners 3a having strongest electric stress between the core 2 and the winding 3. Thus, since the stress is eliminated at the corner 3a, a load for insulation is alleviated, and insulating characteristics are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a saturable reactor used in a magnetic pulse compression circuit that constitutes a part of the power source of a high repetition pulse laser.

(Prior art) When oscillating a high repetition pulse laser such as an excimer laser, pulse excitation CO, laser, etc., in order to obtain a uniform discharge in the laser medium and a pulsed laser beam with high peak energy, it is necessary to add A high voltage of several tens of kilovolts or more is required as well as a fast rise of voltage and current of less than a microsecond. Conventionally, as an electrical excitation circuit for obtaining such voltage and current, there is a magnetic pulse compression circuit equipped with a saturable reactor.

FIG. 3 is a perspective view of a conventional saturable reactor used in such a magnetic pulse compression circuit, and FIG. 4 is a sectional view taken along the line IV-rV in FIG. 3.

In the figure, a saturable reactor 1 has a wound core 2 housed in an insulating case 3, and a winding 4 spirally wound around the outer periphery of the insulating case 3. The wound core 2 is formed by stacking a thin strip-shaped metal magnetic material (silicon copper strip, etc.) 5 with a similarly thin strip-shaped insulating material 6 such as asbestos paper or mica paper, and winding the layer into a spiral shape. As a result, the insulator 6 becomes an interlayer insulator of the metal magnetic body 5. The interlayer insulator reduces loss due to eddy current when a high frequency pulse is applied to the metal magnetic body 4. Eddy currents flow more easily as the thickness of the electrically integrated wound core increases.

Further, since the wound core 2 is wrapped with an insulating tape 7 such as glass tape or cotton tape, the wound core 2 covered with this insulating tape 7 has a doughnut-like cross section with a substantially rectangular shape.
The insulating case 3 has corner portions 3a corresponding to the four corners of this rectangle.

As shown in Japanese Utility Model Application No. 63-121416, the wound core 2 is provided with a strip-shaped buffer insulating member (
It is stored and fixed with good stability in the insulating case 3 with a silicone resin, etc.) 8 interposed therebetween. In addition, the code|symbol 9 is a winding core used when winding up the winding core 2.

(Problem to be solved by the invention) By the way, as mentioned above, the saturable reactor 1 has a winding 4
Since the voltage applied to is a pulsed high voltage of several tens of kV,
Sufficient insulation must be provided between the wound core 2 and the winding 4 at ground potential. In particular, the electrical stress is severe in the part where the two face each other across the corner 3a of the insulating case 3.
- layers of sufficient insulation are required.

For this purpose, the winding 4 itself is coated with insulation, the insulation case 3 is filled with insulating oil or an inert insulating gas such as SF6, or the insulation tape 7 is wrapped in multiple layers until it becomes quite thick. This is necessary.

On the other hand, the wound core 2 having high-frequency pulse characteristics generates heat due to loss, but the temperature rise of the wound core 2 due to this heat radiation affects the saturation characteristics of the magnetic flux density of the wound core 2 through appropriate heat radiation. It must be kept within a certain range.

However, the insulating tape 7 wound to have a sufficient thickness for insulation has extremely poor thermal conductivity.

For this reason, the wound core 2 is unable to dissipate heat appropriately, and the temperature of the wound core 2 increases abnormally, disrupting the saturation characteristics of magnetic flux density. Voltage cannot be sent out.

Furthermore, as the number of times the insulating tape 7 is wound increases, the dimensions of the wound core 2 around which the insulating tape 7 is wrapped expand irregularly.
It becomes impossible to insert the buffer insulating member 8 closely between the wound core 2 and the insulating case 3. In this case, the fixation of the wound core 2 within the insulating case 3 becomes unstable, which adversely affects the saturation characteristics of the magnetic flux density.

The present invention has been made in view of the above circumstances, and has excellent insulation performance, allows for heat dissipation from the wound core without any problems, allows the wound core to be stably fixed in the insulating case, and has good magnetic flux density saturation characteristics. The purpose is to provide a saturation reactor.

[Structure of the invention]

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention stores a wound core in which a band-shaped metal magnetic material and an insulating material are overlapped and wound into a spiral shape, and stores the core in an insulating case. In a saturable reactor with a winding wound around a case, there is a winding core and a winding jig that are electrically connected to the winding core at the inner and outer peripheries of the winding core, respectively, and a winding jig that is electrically connected to the winding core and the outside of the winding jig. A shield ring is electrically connected to each of these and is provided opposite the corner of the insulating case.

(Function) In the saturable reactor of the present invention, the shield ring, which is electrically connected to the winding core through the winding core and the winding jig, is located at a corner of the insulating case where electrical stress is particularly strong between the winding core and the winding wire. The load on insulation is reduced because it plays a role in mitigating the electric field in the area. Therefore, even if the wound core is not covered with insulating tape, stable insulation between the wound core and the windings can be achieved by other means, and the heat generated from the wound core can be transferred to the insulation tape, which has poor thermal conductivity. Heat can be dissipated without being hindered by heat, and the saturation characteristics of magnetic flux density will not be impaired due to a rise in the temperature of the wound core.

(Example) The present invention will be described in detail below with reference to FIGS. 1 and 2.

FIG. 2 shows a saturable reactor 10 according to an embodiment of the present invention.
FIG. 1 is an enlarged view of the right section of FIG. 2. Portions corresponding to those in FIGS. 3 and 4 are given the same reference numerals, and detailed explanations are omitted.

In the saturable reactor 10 of the present invention, a winding core 11 and a winding jig 12 which are electrically conductive and have a certain mechanical strength are closely attached to the inner and outer peripheral parts of an annular wound core 2, respectively, and wound. It is electrically connected to the iron core 2.

5. Then, conductive shield rings 13 are installed at the upper and lower ends of the winding core 1-1 and the winding jig 12, that is, at positions facing the four corners (corners 3a) of the insulating case 3, respectively. It is formed integrally with the winding jig 12 and provided.

As a result, the four shield rings 13 are electrically connected to the wound core 2 via the winding core 11 and the winding jig 12, respectively, and the electrical stress is the highest between the wound core 2 and the winding 4. Shield ring 13 at corner 3a of insulating case 3 with strong
The electric field is relaxed.

Therefore, in this embodiment, the electrical stress at the corner 3a of the insulating case 3 is eliminated, so the burden (equipment) for insulation is reduced and the insulation characteristics are improved. Therefore, even without providing an insulating tape to cover the wound core 2, it is possible to insulate the winding 4, fill the insulating case 3 with insulating oil, inert insulating gas such as SF6, etc. by means that do not impede the heat dissipation of the wound core 2. Sufficient insulation between the wound core 2 and the winding 4 can be achieved.

The saturable reactor 10 of this embodiment has a wound core 2.
Even if heat is generated due to loss, the heat dissipation is not obstructed by the thickly wrapped insulating tape as in the past, and an appropriate amount of heat is immediately dissipated to the outside of the wound core 2, so the saturable characteristics of the magnetic flux density are impaired. There isn't.

In addition, as a result of eliminating the need for covering with insulating tape, the strip-shaped buffer insulating member 8 can be inserted and placed in close contact with both the wound core 2 and the insulating case 3, which are wound up in an orderly manner by a machine. , the wound core 2 is stably housed and fixed within the insulating case 3. Therefore, in the saturable reactor 10 of this embodiment, the wound core 2 is connected to the insulating case 3.
The saturable characteristics will not be disturbed due to unstable movement within.

Furthermore, since the conductive winding core 11 and the winding jig 12 are usually made of metal, they have a certain mechanical strength.

For this reason, when the space factor of the metal magnetic material 4 and the interlayer insulator 5 in the wound core 2 is not sufficient, the buffer insulating member 8 is inserted tightly into the winding core 11 and the winding jig 12. Even if the winding jig 12 is pressed by the buffer insulating member 8, the contact portion between the winding core 11 and the buffer insulating member 8 of the winding jig 12 is depressed, causing the winding core 2 to contract and deform, resulting in saturation. There is no change in characteristics.

If the winding core 2 has a higher electrical resistance than the winding core 11 or the winding jig 12, an eddy current will occur in the turn circuit in the winding direction including the winding core 11 and the winding jig 12, increasing loss and increasing the temperature. cause an increase. However, if a cutting portion is provided in the winding core 11 and the winding jig 1.degree. 2 from the upper end to the lower end at at least one location in the axial direction, the above-mentioned turn circuit will be interrupted and no eddy current will be generated. If there are two or more cutting portions, the winding core 11 and the winding jig 12 will be composed of two or more members.

Further, the shield ring 13 may be installed at any other location as long as it is provided at least at a location facing the corner 3a of the insulating case 3. Further, in the above embodiment, the shield ring 13 is formed integrally with the winding core 11 and the winding jig 12, but these may be formed as separate bodies and the two may be combined.

〔Effect of the invention〕

As explained above, in the saturable reactor of the present invention, shield rings are attached to the ends of the winding core and the winding jig so as to correspond to the corners of the insulation case. ) will be improved. Even if heat is generated in the wound core, the heat is quickly dissipated, and the saturation characteristics of the magnetic flux density are not impaired due to the temperature rise of the wound core. Therefore, a pulse power supply equipped with a magnetic pulse compression circuit using this saturable reactor has a high repetition rate.

It can supply stable voltage and current for pulsed laser generation.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a saturable reactor according to a first embodiment of the present invention, FIG. 2 is a perspective view including a cross section of this saturable reactor, FIG. 3 is a perspective view of a conventional saturable reactor, and FIG. 4 is a perspective view of a conventional saturable reactor.
The figure is a sectional view of a conventional saturable reactor. 2... Winding core, 3... Insulating case, 4... Winding wire,
8... Buffer insulation member, 11... Winding core, 12...
Winding jig, 13...shield ring. Applicant's agent Hisashi Hatano] Figure 2aa

Claims (1)

[Claims] A wound iron core with a substantially rectangular cross section, which is made by overlapping a band-shaped metal magnetic material and an insulating material and wound into a spiral shape, is housed in an annular insulating case having corners corresponding to the outer shape of the wound iron core, and the insulating case is In a saturable reactor around which a winding is wound, the winding core and the winding jig provided on the inner and outer peripheries of the winding core and electrically connected to the winding core and the winding jig, respectively, are electrically connected to the winding core and the winding jig, and the insulating A saturable reactor characterized by forming a shield ring facing the corner of the case.