JPH03278503A - Bobbin for magnetic core device, and magnetic core device and manufacture thereof - Google Patents

Abstract

PURPOSE:To obtain a bobbin fittable to a core having a non-circular closed magnetic circuit without impairing the core and accurately by constituting the bobbin in such manner that two or more bobbin members are bonded together and the outer peripheral face coming in contact with at least the inner peripheral part of the core is formed from two or more bobbin members and the bobbin has a through-hole in the central part. CONSTITUTION:A bobbin 3 fitted to the inner peripheral part of a soft magnetic material core 2 having a continuous closed magnetic circuit around a through-hole with a non-circular cross section is constituted in such manner that two or more bobbin members 31, 33, 35, 37 are bonded together and the outer peripheral face coming in contact with at least the inner peripheral part of the core 2 is formed from two or more bobbin members 31, 33, 35, 37 and the bobbin has a through-hole 4 in the central part. For example, the bobbin 3 fitted to the inner peripheral part of the core 2 of a racetrack-shaped magnetic core device 1 is constituted by curved bobbin members 31, 33 coming in contact with the curved parts 21, 23 of the core 2 and by linear bobbin members 35, 37 coming in contact with the linear parts 25, 27 of the core 2 so that respective bobbin members 31, 33, 35, 37 are bonded together and the through-hole 4 with a rectangular cross section is formed inside.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is applicable to magnetic switches for particle accelerators and excimer lasers, pulse compression devices, saturable reactors such as switching regulators, pulse transformers, etc. The present invention relates to a core bobbin having a non-circular closed magnetic path, a magnetic core device using the bobbin, and a manufacturing method thereof.

<Conventional technology> Conventionally, cores with a non-circular continuous closed magnetic path have been used as magnetic core devices such as saturable reactors and pulse transformers used in magnetic switches for particle accelerators and excimer lasers, pulse compression devices, switching regulators, etc. A magnetic core device equipped with a bobbin is used.

FIGS. 13 and 14 show a magnetic core device 1 having a core in the shape of an elliptical ring, that is, a racetrack shape, with a linear portion on the outer contour, as an example of a magnetic core device having a non-circular closed magnetic path. It will be done.

The magnetic core device I shown in FIG. 14 is a one-turn type in which the bobbin 3 does not have a through hole for winding the winding wire, and the metal bobbin 3 also serves as the winding wire.

This type provides sufficient bobbin strength structurally, but
It is not possible to apply winding.

On the other hand, the magnetic core device 1 shown in FIG. 13 is of a type in which an oblong through hole 4 having a straight portion is provided in the bobbin 3, and the winding wire can be wound in multiple turns.

However, this type has lower bobbin strength than the former.

The bobbin 3 of the type capable of winding such a winding wire is usually manufactured by cutting a block or integrally molding the block by casting or the like.

A soft magnetic core 2 having a non-circular closed magnetic path
A magnetic core device is manufactured by fitting the bobbin 3 into the.

However, since the inner diameter contour of the core 2 is non-circular,
When fitting the bobbin, the core 2 may be damaged.

Further, the through hole 4 for the winding wire should be made as wide as possible in order to make the @ wire work as easy as possible.

For this purpose, it is necessary to reduce the wall thickness of the bobbin 3, for example, in the case of the magnetic core 1 shown in FIG. 13, particularly at the facing straight portions of the bobbin.

However, with the integrated bobbin 3 made by cutting or molding, there is a limit to how thin the bobbin 3 can be made, or changes in thickness may occur.

Furthermore, since the bobbin 3 is fitted later, it is difficult to fit the bobbin 3 onto the core 2 with high precision, and a gap is created between the bobbin 3 and the core 2, which poses a problem in terms of ease of handling.

By the way, as the core material of the magnetic core device l, especially the squareness ratio (
Br/Bs) and magnetic permeability (μ), and coercive force (He).
A thin plate of an amorphous magnetic alloy is suitable because it has excellent soft magnetic properties such as low magnetic flux.

For example, rIEEE Conf, Record of
15th Power Modulator Symp
osium, June 14-16.1982゜Ba
lttimore, MD (Allied Corporation) describes the use of a wound body of a thin plate of an amorphous magnetic alloy as the core material of a racetrack type magnetic core device.

In this case, for applications such as magnetic switches, it is preferable to coat the thin plate with an insulating material or to wind the thin plate with a non-magnetic insulating film interposed therebetween for interlayer insulation of the amorphous magnetic alloy thin plate.

However, the method of applying insulating material to a thin plate does not provide sufficient insulation between the eyebrows.

Therefore, the above-mentioned document states that since amorphous magnetic alloy thin plates require heat treatment to improve their magnetic properties, the bobbin 3, which has a non-circular shape, that is, an oval shape with parallel straight parts, is heat-treated. It is described that the magnetic core device 1 is manufactured by stacking and winding an amorphous magnetic thin plate and an insulating film while applying a predetermined amount of tension.

The above document also describes that heat treatment is performed after an amorphous magnetic alloy thin plate and an insulating film are layered and wound around an oval aluminum bobbin 3 having parallel straight portions. There is.

However, in the method of winding the amorphous magnetic alloy thin plate around the bobbin 3 after heat treatment, the winding condition of the thin plate after heat treatment and the winding condition of the thin plate after winding around the bobbin 3 are different. , the curvature of the thin plate changes, the internal stress increases, and as a result, especially the squareness ratio decreases.

Moreover, since the outer shape of the bobbin 3 is a non-circular shape, that is, an elliptical shape with parallel straight parts, the tension is not uniform, and the winding becomes loose.

In addition, in the method of heat-treating a thin plate after winding it around a non-circular bobbin 3, the bobbin 3 may be bent due to thermal expansion of the bobbin 3 and the thin plate, and the bobbin 3 may be heated at
For example, since the bobbin must be able to withstand temperatures of 200 to 400[deg.] C., the material of the bobbin is limited to metal or ceramics, resulting in an increase in cost.

In addition 9, when winding the thin plate around the non-circular bobbin 3,
Because the tension is not uniform, the winding becomes loose.

<Problems to be Solved by the Invention> The main objects of the present invention are, firstly, to provide a bobbin for a magnetic core device that can be fitted into a core having a non-circular closed magnetic path without damaging the core and with high precision; The goal is to provide equipment.

Another object is to be able to fit the thin plate into a wound body having a non-circular closed magnetic path without applying distortion or stress to the thin plate.
An object of the present invention is to provide a bobbin for a magnetic core device, a magnetic core device, and a method for manufacturing the magnetic core device that eliminates the need for winding for inserting an insulating film during heat treatment of a thin plate, is easy to manufacture, and is low cost. .

<Means for Solving the Problems> Such objects are achieved by the following inventions (1) to (14).

(1) A bobbin that is fitted into the inner peripheral part of a soft magnetic core having a continuous closed magnetic path around a through-hole having a non-circular cross-section, the bobbin having two or more bobbin members joined to at least the core. 1. A bobbin for a magnetic core device, characterized in that an outer circumferential surface in contact with an inner circumferential portion of the bobbin is formed of two or more bobbin members, and has a through hole in a central portion.

(2) (1) above, wherein the core has a racetrack shape
A bobbin for a magnetic core device described in .

(3) The bobbin for a magnetic core device according to (1) or (2) above, wherein the through hole of the bobbin has a rectangular cross section.

(4) The bobbin for a magnetic core device according to any one of (1) to 3) above, wherein the inner circumferential surface constituting the through hole of the bobbin is formed from two or more bobbin members.

(5) The core has a racetrack shape, and the bobbin member includes a pair of thin straight bobbin members that are in contact with substantially the entire length of the inner circumference of the straight portion of the core, and an inner circumference of the curved portion of the core. The bobbin for a magnetic core device according to (4) above, wherein the bobbin is formed from a pair of thick curved bobbin members that are in contact with each other, and a through hole having a rectangular cross section is formed when these bobbin members are joined.

(6) When the thickness between the inner and outer circumferences of the core is tc, the thickness of the straight bobbin member is ts, and the maximum thickness of the curved bobbin member is tr, ts/tc is 0. 1-0.5
, tr/tc is 0.5 to 2, the bobbin for a magnetic core device according to (5) above.

(7) When the through-hole gap between the straight bobbin members is w, and the through-hole gap between the curved bobbin members is i, t s
The bobbin for a magnetic core device according to (6) above, wherein /w is 0.04 to 1 and ts/β is 0.006 to 0.1.

(8) A magnetic core device, characterized in that a soft magnetic core is fitted into the bobbin for a magnetic core device according to any one of (1) to 7) above.

(9) The above (wherein the core is a wound body of a thin magnetic alloy plate)
8) The magnetic core device according to item 8).

(10) The magnetic core device according to (9) above, wherein the magnetic alloy thin plate is an amorphous magnetic alloy thin plate.

(11) The magnetic core device according to (9) or (10) above, wherein the magnetic alloy thin plate is wound with a nonmagnetic insulating film interposed therebetween.

(12) After winding the magnetic alloy thin plate, it is heat treated while being held in a non-circular shape, and then the bobbin for a magnetic core device according to any one of (1) to 7) above is fitted to the wound body. A method for manufacturing a magnetic core device, characterized by:

(13) The method for manufacturing a magnetic core device according to (12) above, wherein the magnetic alloy thin plate is an amorphous magnetic alloy thin plate.

(14) The method for manufacturing a magnetic core device according to (12) or (13) above, wherein the magnetic alloy thin plate is wound with a nonmagnetic insulating film interposed therebetween.

For use> The bobbin for a magnetic core device of the present invention is composed of a bobbin member vertically divided into two or more.

When fitting the bobbin to the core, the bobbin member is assembled after being inserted, so the core is not damaged.

In addition, the wall thickness of the bobbin can be made thin in order to widen the through hole for the winding wire, and the bobbin member can be divided into simple and symmetrical shapes, so the size and surface of the member can be reduced. High accuracy can be achieved.

In addition, since we assemble high-precision bobbin members, we can fit them into the core with precision.

In addition, when using a wound body of an amorphous magnetic alloy or the like as a core, in addition to the above, there is no gap between the magnetic alloy thin plates.
Moreover, the thin plate can be fitted with the same curvature as when it is wound, that is, without causing distortion in the thin plate.

In addition, wound bodies made of elastic amorphous magnetic alloys are easily deformed by external forces, and the wound body may not maintain a constant shape during handling, making it difficult to insert a one-piece bobbin in particular. However, according to the present invention, insertion becomes easier, and damage to the wound body and occurrence of unnecessary distortion are further reduced.

In addition, since the bobbin of the present invention is manufactured by joining bobbin members with a simple structure, the bobbin is easy to manufacture.
And manufacturing cost is low.

<Specific structure of the invention> Hereinafter, the specific configuration of the present invention will be explained in detail.

The bobbin for a magnetic core device of the present invention is a winding core or an inner frame portion of a core of a magnetic core device.

The core is a soft magnetic material having a continuous closed magnetic path around a through hole having a non-circular cross section.

In this case, the core shape is not particularly limited as long as the shape of the cross section of the through hole, that is, the inner contour of the cross section of the core is non-circular, and the outer contour of the cross section of the core is 1 circular or non-circular. It can be of any shape.

Examples of the non-circular shape include various shapes such as an elliptical shape having parallel straight portions (so-called racetrack shape), an elliptical shape, a square shape, and a rectangular shape.

However, among these, the core shape is preferably an oval racetrack shape having an outer contour having parallel straight portions.

This is because, in such a case, the effects of the present invention are exhibited even more markedly.

Further, the core material is not particularly limited as long as it is a soft magnetic material.

The core may be a wound body, a molded sintered body of various types of ferrite, or a molded body, that is, a powder core.

The bobbin of the present invention is mainly used as a reinforcing member for maintaining the shape of a wound body of magnetic alloy thin plates, a reinforcing member for a formed sintered body, or a formed body. It functions as an insulating member or a conductor for one terminal.

The bobbin of the present invention is composed of a bobbin member divided into two or more parts.

When two or more bobbin members are joined together and fitted onto the inner circumferential portion of the core, at least the outer circumferential surface of the bobbin that is in contact with the inner circumferential portion of the core is formed by the two or more bobbin members.

By forming the outer peripheral surface by joining two or more bobbin members, assembly after fitting can be performed.

The material of the bobbin may be any conventional bobbin material such as resin, non-magnetic metal such as aluminum or stainless steel, or non-magnetic ceramic.

In this case, metal materials are effective in obtaining even higher strength, and in order to prevent heat generation due to induced current, materials with processability such as phenol resins, epoxy resins, vinyl chloride, nylon, and polyfluoroethylene resins are effective. A resin material with good properties is preferable.

Further, the bobbin shape of the present invention has a non-circular outer contour in a cross section. For example, it may have various shapes such as an elliptical shape having parallel straight portions, an elliptical shape, a square shape, and a rectangular shape.

The assembled bobbin has a through hole in the center.

In this case, the bobbin volume can be reduced by the amount of the through hole, reducing dielectric loss due to the bobbin material, and in addition, it is also possible to insert a conductor for one turn or wind the winding wire in multiple turns. .

Moreover, it is preferable that the inner circumferential surface constituting the through hole is formed from two or more bobbin members.

In such a case, it becomes easier to fit the soft magnetic material into the core, the structure of the member becomes simpler, the dimensional accuracy improves, the member manufacturing becomes easier, and the effects of the present invention are further enhanced. Become.

Hereinafter, as a preferred example, the bobbin for a magnetic core device of the present invention will be described, taking as an example a magnetic core device whose cross-sectional outline has an oval racetrack shape and has parallel straight portions.

A preferred example of the assembled bobbin of the present invention is shown in FIG.

In the figure, boundaries between the respective bobbin members, holes for screwing, etc. are omitted.

The bobbin 3 has a pair of thick parts 38 whose cross section is approximately semicircular.
．． 38, and a pair of thin wall portions 39.3 whose cross section is substantially straight.
9.

A through hole 4 having a substantially rectangular cross section is formed in the center of the bobbin 3.

If the bobbin 3 has such a structure, the through hole 4 can be made even wider while maintaining high strength.

However, with the conventional integral molding process, it is particularly difficult to manufacture the bobbin 3 having a thin straight portion, that is, a thin wall portion 39, as shown in FIG. 9, and the dimensions and surface accuracy are insufficient.

The preferred dimensions and preferred dimension ratio of the bobbin 3 of the present invention in the case of a racetrack-shaped magnetic core device are determined by determining the maximum factor of the thick wall portion 38 of the bobbin 3 (curved bobbin member to be described later) shown in FIG.
ltr, thickness ts of thin wall portion 39 (straight section bobbin member described later), through hole gap β between thick wall portions 38 and 38, thin wall portion 39
．． It is as follows when expressed using the through-hole gap w between 39 and the height h of the bobbin 3.

t s/w is 0.04 to 1. Especially 0.05~0.5, t
s/n is 0.006 to O,l, especially 0.01 to 0.05
It is preferable that

If t s/w or ts/β is less than the above range, the bobbin strength tends to be insufficient.

If ts/w or ts/β exceeds the above range, the through hole 4 will become narrow, making it difficult to wind the wire, and in addition, in the case of a non-metallic bobbin, the dielectric loss due to the bobbin material will increase. There is a tendency.

Moreover, ts/h is generally 0.1 to 0.3.

In the case of the size ratio in the above range, generally ts is 2 to 2.
10mm, tr is 10-30II1m.

Also, when the wall thickness between the inner and outer circumferences of the core is tc, t
It is preferable that s/tc is 0.1-0.5 and tr/tc is 0.5-2.

When ts/1cji'11tr/tc is less than the above range, the bobbin strength tends to be insufficient.

If ts/tc or tr/tc exceeds the above range, the through hole 4 will become narrow, making it difficult to wind the wire, and in addition, in the case of a non-metallic bobbin, the dielectric loss due to the bobbin material will increase. There is a tendency.

When the dimensions and dimension ratio of the bobbin are within the above ranges, the bobbin has sufficient strength and is extremely easy to handle during fitting, thereby further improving the effects of the present invention.

Note that the bobbin 3 may be provided with a collar, a hole for screwing, etc., if necessary.

In this case, the bobbin whose collar is coated is usually obtained by fixing the collar to the end face of the bobbin 3 with screws.

Hereinafter, racetrack-shaped magnetic core devices using preferred examples of the bobbin of the present invention are shown in FIG. 1 and FIGS. 3 to 7, respectively, and will be described according to the illustrated examples.

The bobbin 3 shown in FIG. 1 has a bent bobbin member 31.23 that contacts the bent portions 21.23 of the 5-core 2 when the bobbin 3 is fitted into the core 2.
33, and a straight part bobbin member 35.37 that is in contact with the straight part 25.27 of the core 2.

In this case, the bobbin 3 can be used for various molded sintered bodies and molded bodies as described above, but is particularly suitable for wound bodies of magnetic alloy thin plates, and more preferably for wound bodies of amorphous magnetic alloy thin plates. It is particularly effective when

2 is a perspective view of the bobbin 3 shown in FIG. 1.

The curved bobbin members 31.33 each have a semicircular cross section, and have straight protrusions 311.313 and 335.337 at the end of each arc.

By adopting such a shape, the strength of the bobbin can be increased.

The straight bobbin members 35 and 37 are each in the shape of a straight plate, and have convex portions 351 and 355 and a convex portion 373 at each end.
．． It has 377.

These bobbin members 31, 33, 35, 37 are joined to each other to form a bobbin 3 having an oval outer contour with a straight portion and a through hole 4 having a rectangular cross section inside.

The joining of each bobbin member is between the protrusions 311 and 351, and between the protrusions 3 and 3.
13.373 questions, 335.355 convex parts and 33 convex parts
This is done by joining them while locking them. For example, the convex portions may be bonded together using various adhesives, or may be bonded using various screws.

Screw fastening is usually performed by screwing a screw 10 into the bobbin 3 from the inner peripheral side, as shown in FIG.

Then, each joint is usually secured with two or more screws.

When using screws, screws made of plastic or non-magnetic ceramics are particularly preferred since they can prevent losses due to eddy currents and the like.

Examples of the plastic include polycarbonate, polyfluoroethylene resin, and phenol resin.

Note that the convex portions 311.313.335. 337.351, 355.373 and 377 can join the bobbin members 31.33.35 and 37 to each other,
It may be used in any position as long as it has a predetermined shape and a smooth outer shape and through-hole outline. For example, as shown in FIG. 3, contrary to the bobbin 3 shown in FIG. 1, the convex portion of the straight bobbin member may be joined by locking the convex portion of the curved bobbin member from the outside. good.

Alternatively, one of the protrusions may be fitted into the other.

When the bobbin 3 is assembled in this manner, a through hole 4 is formed in the bobbin 3.

Therefore, the volume of the bobbin 3 can be reduced by the amount of the through hole 4. As a result, the dielectric loss due to the bobbin material is reduced by the reduction in the bobbin volume. In addition, magnetic core device 1
It is also possible to insert a conductor for one turn or to wind the winding wire in multiple turns.

FIG. 4 shows another example of the bobbin 3 of the present invention.

In this case, unlike the examples shown in Figures 1 to 3,
The bobbin members 31, 33, 35, and 37 are divided into four longitudinal sections without forming any convex portions.

The bobbin members are locked and joined to each other at the side surfaces of each bobbin member, thereby forming a bobbin 3 having a predetermined shape and a smooth outer and inner shape.

Further, FIGS. 5 and 6 each show an example of a bobbin 3 of the present invention in which two bobbin members are joined together.

A pair of bobbin members 30 and 30'' shown in FIG. 5 are each symmetrically divided into two longitudinally by a thick portion having a substantially semicircular cross section.

A pair of bobbin members 32 and 32' shown in FIG. 6 are each divided into two vertically by a thin section having a substantially linear cross section.

The bobbin member 32 has convex portions 321 and 32 for joining.
3, the bobbin member 32° has a convex portion 321° for joining.
, 323'.

The bobbin 3 shown in FIGS. 5 and 6 has only one type of bobbin member, and is therefore advantageous in manufacturing.

Further, FIG. 7 shows an example of a bobbin 3 of the present invention in which bobbin members divided into three parts are joined.

The bobbin members 34, 34° and 36 are vertically divided into three parts by a pair of thick portions each having a substantially semicircular cross section.

More specifically, approximately semicircular bobbin members 34.34' are joined to both ends of a bobbin member 36 whose central outer shape is approximately rectangular.

In the examples shown in FIGS. 5 to 7, the respective bobbin members are joined to each other to form a bobbin 3 having a predetermined shape and a smooth outer and inner shape.

In each of the bobbins 3 shown in FIG. 1 and FIGS. 3 to 7, after assembly, a thick portion with a substantially semicircular cross section is formed in the curved portion 21, 23 of the core 2. A bobbin 3 with high strength is obtained. Then, the straight portion 25 of the core 2.
The part that is in contact with 27 is thin and linear, so the through hole 4
can be formed even wider.

Also, among the above bobbins, Fig. 1, Fig. 3, and Fig. 4
Particularly preferred are bobbins of the type shown in the figures.

Since the bobbin 3 is divided into a straight bobbin member and a curved bobbin member, each bobbin member can be manufactured more accurately (and more easily) than other types of bobbins.

In addition, since the pair of linear thin sections of the bobbin 3 are each made of a single member, extremely high mechanical strength can be obtained.

The above description has been made by citing a preferred example of the bobbin 3 for a magnetic core device of the present invention, but the present invention is not limited to these, and the bobbin 3 is composed of two or more bobbin members, and As long as the outer contour of the surface is non-circular and a through hole having a generally rectangular cross section is formed, the conditions such as the shape and dimensions of the bobbin member may be any. In this case, the dimensions of the bobbin 3 are appropriately determined depending on the purpose and use.

Next, a magnetic core device 1 having a continuous closed magnetic path using the bobbin 3 of the present invention and a manufacturing method thereof will be explained.

In this case as well, as a preferred example, a racetrack-shaped magnetic core device using a wound body of a thin magnetic alloy plate as the core 2 will be explained.

Although there are no particular restrictions on the magnetic alloy thin plate used, an amorphous magnetic alloy thin plate is preferable.

The composition of the amorphous magnetic alloy thin plate may be any conventionally known composition, but it is usually appropriately selected from Co-based amorphous magnetic alloys.

The thickness of the amorphous magnetic alloy thin plate is usually about 14 to 25 mm.
The width is usually about 10 to 100 o+m.

Further, as the insulating film, various insulating resins can be selected from a wide range of insulating resins.

Examples include polyester, polyamide, polyimide, etc., and polyethylene terephthalate (PET) is preferable as polyester.

The thickness of the insulating film is usually about 2 to 6 mm, and the width is usually about 11 mm.
~108mm.

First, as shown in FIG. 10, such an amorphous magnetic alloy thin plate 8 and an insulating film 9 are layered and wound around, for example, a split winding frame 6, the ends are fixed, and the inner shape is And a toroidal wound body 5 having a circular outer contour is obtained.

Note that the ends at the beginning and end of winding may be fixed with tape or the like.

During winding, it is preferable to apply tension in order to improve magnetic properties such as squareness ratio.

In this case, since the wire is wound in a toroidal shape, that is, in a circular cross-section, tension can be applied uniformly.

The tensile strength of the amorphous magnetic alloy thin plate is 10 to 100 k.
g/c+++”, the tension of the insulating film is 1
It is preferable to set it to about 5 kg/am''.

The dimensions of the toroidal wound body 5 may be determined as appropriate depending on the application, etc., but usually, the inner diameter is about 100 to 400 mm, and the outer diameter is about 1.
The size is about 50 to 450III11, and the thickness is about 10 to 100 mm.

Next, the toroidal wound body 5 is removed from the split winding frame 6 and subjected to heat treatment using a heat treatment jig.

In this case, for example, a heat treatment jig 7 having a regulating convex portion 71 having the shape shown in FIG. 11 and a through hole 75 for applying a magnetic field is used.

Then, the toroidal wound body 5 is inserted into a track shape at the center of the jig 7, and the top and bottom are sandwiched between plates (not shown), and heat treatment is performed while holding the body in a racetrack shape.

In addition, when manufacturing a magnetic core device having a core shape other than a racetrack-shaped magnetic core device, the shape of the jig 7 and the shape of the regulating convex portion 71 may be changed depending on the core shape.

The heat treatment may be carried out either in the absence of a magnetic field or in a magnetic field, but it is preferably carried out in a magnetic field in order to improve the squareness ratio.

The heat treatment temperature is below the crystallization temperature Tx and above the Curie temperature T.
Do the following c.

Usually, the applied magnetic field is about 5 to 100 e, the heat treatment temperature is about 200 to 400° C., and the holding time at the maximum temperature is about 1 to 3 hours. A non-oxidizing, oxidizing, or reducing atmosphere can be used as the heat treatment atmosphere, and a non-oxidizing atmosphere is particularly suitable.

In this way, a racetrack-shaped wound body 20 having an oval cross-sectional outline with parallel straight portions and a through hole in the center is obtained.

Next, while keeping the shape of the rolled body 20 after the heat treatment, the rolled body 2 is
0 to fit bobbin 3.

In this case, since the magnetic core device 1 can be manufactured while maintaining the curvature of the amorphous magnetic alloy thin plate after heat treatment, the magnetic properties of the magnetic core device 1 are not deteriorated, and the squareness ratio is high and the coercive force Hc is low. is obtained.

To fit the bobbin 3, for example, a part of the bobbin member is placed inside the winding body 20, and the remaining bobbin members are slid into the joint between the bobbin members and between the winding bodies to assemble. , each member is joined using screws, adhesive, etc.

In this way, since the divided bobbin members are used to fit the bobbin, the winding body 20 and the bobbin 3 can be easily fitted together without a gap (and without damaging the winding body 20).

In the manufacturing method of the present invention, the bobbin 3 having a non-circular shape
Since there is no process of winding the magnetic alloy thin plate in the
There is no looseness in the winding.

Depending on the purpose, the completed magnetic core N1 is wound with a predetermined number of windings (not shown) for one turn or two or more turns to form a saturable reactor or the like. Any conventional known method may be used to wind the winding.

In addition, when using metal as the bobbin material, the bobbin 3
The conductor itself may be used as a conductor for one turn.

In addition, when using the device by applying a high voltage, the insulation property can be improved by immersing the entire device in a conventionally known insulating oil.

The magnetic core device 1 having the bobbin 3 for a magnetic core device of the present invention can be suitably used in magnetic switches for particle accelerators and excimer lasers, switching regulators, saturable reactors such as pulse compression devices, pulse transformers, and the like.

FIG. 12 shows an example of a circuit that generates compression pulses using multi-stage magnetic switches.

This circuit consists of an inductor L++ + a saturable reactor Ltj1
5, and capacitors C1, Cs, and Cs.
It is composed of tiers. The capacitance of each capacitor is equal to each other, and the inductance of each saturable reactor is set to be the smallest at the higher stage, that is, at the output side.

With this configuration, when CI is charged, switch S
When closed, the charge on CI passes through inductor L1 and C2
flows into.

After C1 is charged, the saturable reactor 2 becomes saturated, the impedance decreases, and the charge flows to the capacitor C1.

Then, by sequentially performing such operations up to the final stage, the current pulse width is sequentially compressed while maintaining the energy of the original waveform, and a pulse having a large current peak is obtained.

<Example> Hereinafter, the present invention will be explained in further detail by giving specific examples of the present invention.

Example 1 A magnetic core device 1 shown in FIG. 1 was manufactured in the following manner.

First, as shown in FIG. 10, an amorphous magnetic alloy thin plate and an insulating film are stacked and wound around a split winding frame 6, the ends are fixed, and the inner diameter is 172 ohm, the outer diameter is 212 am, and the thickness is 24 a+m. A toroidal wound body 5 having a toroidal shape was obtained.

The amorphous magnetic alloy thin plate used had an atomic composition of C0yx-
Fes -Mnt -s is -Bias Thickness 22
-1 width was 24 mm.

Further, the material of the insulating film was a polyamide film, and the dimensions were 6 mm in thickness and 28 mm in width.

When winding, 250g of
A tension of 36 g was applied to the insulating film.

Next, the toroidal wound body 5 is removed from the winding frame 6, and the first
After inserting it into a racetrack mold using the heat treatment jig 7 shown in FIG. 1, heat treatment was performed in a magnetic field in a nitrogen atmosphere.

The applied magnetic field was 100 e, the heat treatment temperature was 220° C., and the holding time was 2.5 hours.

In this way, a racetrack-shaped wound body 20 was obtained, which had a through hole with a rectangular cross section in the center and an oval outer contour with parallel straight sections in the cross section.

The squareness ratio Br/Bs of the obtained wound body 20 and the coercive force Hc
Using a DC B-H measurement device, the maximum applied magnetic field was 50 s.
When measured, the squareness ratio was 99%, Hc was O, 01O
It was e.

Next, the wound body 20 was removed from the racetrack shape of the jig 7, and then the bobbin 3 was fitted onto the wound body 20.

The bobbin 3 used was a bobbin member 31, 33 made of phenolic resin molded body (Bakelite) as shown in FIG.
．． 35.37 were bonded together using an epoxy adhesive.

In this case, the bobbin 3 is installed inside the wound body 20,
The bobbin members 31, 33, 35, and 37 were assembled and each member was joined.

In the magnetic core device 1 manufactured in this way, the amorphous magnetic alloy thin plate and the insulating film are evenly wound, the wound body 20 has no scratches, and the wound body 2o and the bobbin 3 are uniformly wound. were fitted without any gaps.

In addition, when the squareness ratio and Hc of &ii core device 1 were measured in the same manner as above, the squareness ratio was 99%, and Hc was 0.0.
10e, and there was no deterioration in magnetic properties.

<Effects of the Invention> By using the bobbin for a magnetic core device of the present invention, it is possible to easily fit the core of a soft magnetic body such as a wound body, a shaped sintered body, a molded body, etc., without damaging it.

Since the bobbin members are assembled, the wall thickness of the hobbin can be made thinner, the through-hole of the magnetic core device can be made wider, and the dimensions and surface accuracy can be made higher.

In addition, since highly accurate bobbin members are assembled, the core can be fitted with high accuracy.

In addition, in the case of racetrack-shaped bobbins for magnetic core devices,
The assembled shape consists of a semicircular thick part and a linear thin part, and the thin part is reinforced by the thick part, so it has high strength.

In particular, in magnetic core devices that use elastic magnetic alloy windings, the windings are easily deformed by external forces, which makes insertion difficult with conventional integrated bobbins. damage is further reduced.

Furthermore, since the thin plate of amorphous magnetic alloy or the like and the insulating film are each wound with uniform tension, there is no loosening of the winding.

In addition, since the magnetic core device can be manufactured in the same shape as the wound body after heat treatment, the magnetic core device can be manufactured without changing the curvature of the amorphous magnetic alloy thin plate. Therefore, a magnetic core device having excellent soft magnetic properties such as a high squareness ratio without deteriorating the magnetic properties of the core can be obtained.

Moreover, the bobbin for a magnetic core device of the present invention has higher dimensional and surface accuracy, is easier to process, and is lower in cost than conventional one-piece bobbins.

[Brief explanation of drawings]

FIG. 1, FIG. 3, FIG. 4, FIG. 5, FIG. 6, and FIG. 7 are plan views each showing an example of a racetrack-shaped magnetic core device using the bobbin for a magnetic core device of the present invention. It is. FIG. 2 is a perspective view showing an example of the bobbin for a magnetic core device of the present invention. FIG. 8 is a partial perspective view showing a bobbin for a magnetic core device of the present invention joined with screws. FIG. 9 is a perspective view showing an example of the shape of the bobbin for a magnetic core device of the present invention. FIG. 1O and FIG. 11 are plan views for explaining the method of manufacturing the magnetic core device of the present invention, respectively. FIG. 12 is a circuit diagram of the pulse generator. FIGS. 13 and 14 are plan views showing racetrack-shaped magnetic core devices using conventional bobbins for magnetic core devices, respectively. Explanation of symbols l...Magnetic core device 2...Core 20...Wound body 21.23...Bend portion 25.27...Straight portion 3...Bobbin for magnetic core device 30.30' 31 .32. 34.34° 35.36. 32' 33. 37...Bobbin member 311, 313, 321, 321°323' 335, 337, 351.373.3
77...Convex portion 38...Thick wall portion 39...Thin wall portion 4...Through hole 5...Troidal winding body 6...Winding frame 7...Heat treatment jig 71... - Convex portion 75... Through hole 8... Magnetic alloy thin plate 9... Insulating film 10... Screw 323. 355,

Claims (14)

[Claims] (1) A bobbin that is fitted into the inner peripheral part of a soft magnetic core having a continuous closed magnetic path around a through-hole having a non-circular cross-section, the bobbin having two or more bobbin members joined to at least the core. 1. A bobbin for a magnetic core device, characterized in that an outer circumferential surface in contact with an inner circumferential portion of the bobbin is formed of two or more bobbin members, and has a through hole in a central portion. (2) The bobbin for a magnetic core device according to claim 1, wherein the core has a racetrack shape. (3) The bobbin for a magnetic core device according to claim 1 or 2, wherein the through hole of the bobbin has a rectangular cross section. (4) The bobbin for a magnetic core device according to any one of claims 1 to 3, wherein the inner circumferential surface constituting the through hole of the bobbin is formed from two or more bobbin members. (5) The core has a racetrack shape, and the bobbin member includes a pair of thin straight bobbin members that are in contact with substantially the entire length of the inner circumference of the straight portion of the core, and an inner circumference of the curved portion of the core. 5. The bobbin for a magnetic core device according to claim 4, wherein the bobbin is formed from a pair of thick curved bobbin members that are in contact with the bobbin member, and when these bobbin members are joined, a through hole having a rectangular cross section is formed. (6) When the thickness between the inner and outer circumferences of the core is tc, the thickness of the straight bobbin member is ts, and the maximum thickness of the curved bobbin member is tr, ts/tc is 0. 1-0.5
, tr/tc is 0.5 to 2, the bobbin for a magnetic core device according to claim 5. (7) When the through-hole gap between the straight bobbin members is w, and the through-hole gap between the curved bobbin members is l, ts/
The bobbin for a magnetic core device according to claim 6, wherein w is 0.04 to 1 and ts/l is 0.006 to 0.1. (8) A magnetic core device, characterized in that a soft magnetic core is fitted into the bobbin for a magnetic core device according to any one of claims 1 to 7. (9) The magnetic core device according to claim 8, wherein the core is a wound body of a magnetic alloy thin plate. (10) The magnetic core device according to claim 9, wherein the magnetic alloy thin plate is an amorphous magnetic alloy thin plate. (11) The magnetic core device according to claim 9 or 10, wherein the magnetic alloy thin plate is wound with a nonmagnetic insulating film interposed therebetween. (12) After winding the magnetic alloy thin plate, it is heat treated while being held in a non-circular shape, and then the bobbin for a magnetic core device according to any one of claims 1 to 7 is fitted to the wound body. A method for manufacturing a magnetic core device. (13) The method for manufacturing a magnetic core device according to claim 12, wherein the magnetic alloy thin plate is an amorphous magnetic alloy thin plate. (14) The method for manufacturing a magnetic core device according to claim 12 or 13, wherein the magnetic alloy thin plate is wound with a non-magnetic insulating film interposed therebetween.