JPH0410603A - Magnetic core device and manufacture thereof - Google Patents

Abstract

PURPOSE:To prevent a gap between a winding body and an inner frame, loosening of a thin plate and sideway slip because a core is protected sufficiently and the winding body swells by installing on the core a bobbin having such a shape as to expose a part of the outer side surface and outer peripheral surface of the core. CONSTITUTION:A bobbin 6 comprises an inner frame 3 fitted on the inner circumference of a core 2 and a reinforcement portion which is in contact with the outer side surface and peripheral surface of the core 2 and formed in one piece on the inner frame 3. Any shape can be taken for the reinforcement portion if the shape exposes a part of the outer side surface and outer peripheral surface of the core 2. The shape is determined appropriately according to applications or the like. The reinforcement portion has a collar portion 4 which is in contact with the outer side surface of the core 2 and formed in one piece with the inner frame 3, and a pressing member 5 which is in contact with the outer peripheral surface of the core 2 and formed in one piece with the collar portion 4.

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 magnetic core device in which a bobbin is attached to a core having a non-circular closed magnetic path, and a method for manufacturing the same.

<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.

FIG. 15, FIG. 16, and FIG. 17 show a magnetic core having an oval ring shape, that is, a racetrack-shaped core with a linear portion on the outer contour, as an example of a magnetic core device having a non-circular closed magnetic path. A device 1 is shown.

In the magnetic core device 1 shown in FIGS. 15 and 16, a racetrack-shaped bobbin 6 is attached to the inner peripheral portion of the core 2. As shown in FIG.

However, in this type of bobbin, the outer surface and peripheral surface of the core are completely exposed, so that the core 2 is insufficiently protected.

In order to prevent damage to the core 2, extreme care must be taken in handling and storing the magnetic core device.

In particular, as in the magnetic core device 1 shown in FIG.
When a wound body 20 of a magnetic alloy thin plate is used as a magnetic alloy thin plate, as shown in the figure, the wound body 20 may swell, the thin plate may sag, or the thin plate may become thicker than the magnetic core device 1 during handling or storage. A so-called lateral shift occurs.

For this reason, the squareness ratio of the magnetic core device L decreases, and the coercive force H
c increases, and the soft magnetic properties deteriorate.

In addition, Japanese Utility Model Publication No. 163720/1983 discloses that a large number of adhesives are formed by applying an adhesive along the radial direction to the laminated surface of the wound body 20 of the amorphous magnetic alloy thin plate shown in FIG. A magnetic core device 1 is disclosed in which portions 10 are provided at intervals in the circumferential direction.

However, although the magnetic core device 1 provided with the adhesive portion 10 in this manner is resistant to displacement in the thickness direction (direction of arrow a in the figure), it is resistant to displacement in the width direction (direction of arrow a in the figure). weak.

Moreover, since the adhesive is applied directly to the thin plate, the adhesive penetrates into the thin plate, deteriorating its magnetic properties.

In addition, the protection of the wound body 20 is insufficient.

Further, the magnetic core device 1 shown in FIG. 17 has a bobbin 6 attached so as to completely cover the entire core 2.

In this type of magnetic core device 1, since the core 2 is sufficiently protected, the magnetic core device 1 can be easily handled and stored.

Even when a wound body of a magnetic alloy thin plate is used as the core 2, bulging of the wound body and lateral displacement and sagging of the thin plate can be prevented.

However, since the core 2 is completely covered by the bobbin 6, the cooling performance of the magnetic core device 1 is extremely low.

Therefore, when using the magnetic core device 1, countermeasures against heat generation become an important issue, and for example, it is necessary to provide a large-scale cooling device.

<Problems to be Solved by the Invention> The main object of the present invention is to provide a magnetic core device in which the core is sufficiently protected, easy to handle and store, and has good cooling performance.

Another object of the present invention is to provide a magnetic core device in which a bobbin is fitted into a wound body having a non-circular closed magnetic path, which is capable of being re-wound for inserting an insulating film after heat treatment of a magnetic alloy thin plate. It is an object of the present invention to provide a magnetic core device that is unnecessary, easy to manufacture, provides sufficient protection for the wound body, and has good cooling performance, and a method for manufacturing the magnetic core device.

Means for Solving the Problems> These objects are achieved by the following inventions (1) to (12).

(1) In a magnetic core device in which a bobbin is attached to a soft magnetic core having a continuous closed magnetic path around a through hole having a non-circular cross section, the bobbin includes an inner frame having a through hole and a reinforcing portion. the inner frame is fitted into the inner peripheral part of the core, and the reinforcing part is integrated with the inner frame so as to be in contact with the outer surface and the outer peripheral surface of the core, the core A magnetic core device characterized in that a part of the outer surface and/or outer peripheral surface of the magnetic core device is exposed.

(2) The magnetic core device according to (1) above, wherein the inner frame is formed by joining two or more divided inner frame members.

(3) The magnetic core device according to (1) or (2) above, wherein the reinforcing portion includes a flange portion and a pressing member that contacts the outer circumferential surface of the core.

(4) (1) above, wherein the core has a racetrack shape
The magnetic core device according to any one of 3) to 3).

(5) The above (1) wherein the core is a wound body of a magnetic alloy thin plate.
The magnetic core device according to any one of ) to 4).

(6) The magnetic core device according to (5) above, wherein the magnetic alloy thin plate is an amorphous magnetic alloy thin plate.

(7) The magnetic core device according to (5) or (6) above, wherein the magnetic alloy thin plate is wound with a nonmagnetic insulating film interposed therebetween.

(8) After winding the magnetic alloy thin plate, it is heat-treated while being held in a non-circular shape, and then an inner frame is fitted to the inner periphery of the wound body, and an inner frame is fitted to the outer surface and peripheral surface of the wound body. A method for manufacturing a magnetic core device, characterized in that a reinforcing portion is integrated with the inner frame so that at least a part of the wound body is exposed.

(9) Manufacturing the magnetic core device according to (8) above, wherein when fitting the inner frame, the inner frame member divided into two or more parts is inserted into the inner peripheral part of the wound body, and they are joined together and integrated. Method.

(10) The above-mentioned (8) or (9), wherein the reinforcing portion has a flange portion and a pressing member that contacts the outer peripheral surface of the wound body.
A method for manufacturing a magnetic core device according to.

(11) The method for manufacturing a magnetic core device according to any one of (8) to 10 above, wherein the magnetic alloy thin plate is an amorphous magnetic alloy thin plate.

(12) The method for manufacturing a magnetic core device according to any one of (8) to 11), wherein the magnetic alloy thin plate is wound with a nonmagnetic insulating film interposed therebetween.

<Operation> In the magnetic core device of the present invention, since the core is covered with a bobbin, the core is sufficiently protected.

Therefore, the magnetic core device is easy to handle and store.

For example, even if magnetic core devices are placed one on top of the other, they will not be damaged or their soft magnetic properties will deteriorate.

In addition, when a wound body of magnetic alloy thin plate is used as the core, in addition to the above, during storage and handling of the magnetic core device, the wound body may bulge, creating a gap between the wound body and the inner frame, or the thin plate may swell. This can prevent sagging and lateral displacement.

The magnetic core device of the present invention has very good cooling performance because a portion of the core is exposed.

Therefore, measures against heat generation can be easily taken, and, for example, the cooling device used can be simplified.

Further, in the method for manufacturing a magnetic core device of the present invention, a bobbin is attached to a wound body of a magnetic alloy thin plate in the state at the time of heat treatment.

Therefore, the magnetic core device can be manufactured with the curvature as it is wound, that is, without causing distortion in the thin plate.

In addition, the manufactured magnetic core device has a structure that sufficiently protects the core and has good cooling performance.

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

In the magnetic core device of the present invention, a bobbin is attached to the core, and the bobbin is shaped so that a part of the outer surface and/or outer peripheral surface of the core is exposed.

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 a non-circular shape, and the outer contour of the cross section of the core can be 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.

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 used in the present invention is mainly used as a reinforcing member to maintain the shape of the wound magnetic alloy thin plate on the inner circumference, outer surface, and outer circumferential surface of the core, a core protection member, and an insulation member for the core. Functions as a member, etc.

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.

Preferred examples of the magnetic core device of the present invention will be shown below and explained according to the illustrated examples.

FIG. 1 is a perspective view showing a magnetic core device 1 of the present invention, and FIG. 2 is an exploded perspective view of the magnetic core device 1.

The bobbin 6 includes an inner frame 3 fitted to the inner circumferential portion of the core 2, and a reinforcing portion integrated with the inner frame 3 so as to be in contact with the outer surface and the outer circumferential surface of the core 2.

The shape of the reinforcing portion is not particularly limited as long as it exposes a part of the outer surface and/or outer circumferential surface of the core 2, and is determined as appropriate depending on the use and the like.

Further, the reinforcing portion includes a collar portion 4 that is in contact with the outer surface of the core 2 and is integrated with the inner frame 3, and a presser foot that is in contact with the outer peripheral surface of the core 2 and is integrated with the collar portion 4. It is preferable to have the member 5.

The inner frame 3 used in the present invention can be fitted into the core 2. In other words, the shape of the inner frame 3 is such that the outer contour of the cross section is
It has a non-circular shape. For example, the shape may be any number of shapes, such as an oval shape having parallel straight portions, an elliptical shape, a square shape, and a rectangular shape.

The inner frame 3 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. .

Further, the inner frame 3 may be formed with through holes or recesses for screwing in order to join the reinforcing portions. Note that in the illustrated example, a hole 391 is formed.

The inner frame 3 is not particularly limited as long as it has a predetermined shape, a smooth outer shape and inner shape, and can be fitted into the core 2.
In order to facilitate fitting into the core 2, it is preferable to join two or more divided inner frame members.

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

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

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

In such a case, it becomes easier to fit the soft magnetic material into the core, the structure of the inner frame member becomes simpler, the dimensional accuracy improves, and the manufacture of the inner frame member becomes easier.

Hereinafter, as a preferred example, the inner frame 3 used in the present invention will be described, taking as an example a magnetic core device whose cross-sectional outline has an oval racetrack shape having parallel straight portions.

FIG. 9 shows a preferred example of the inner frame 3 used in the present invention and the inner frame 3 after assembly.

In the figure, boundaries between the inner frame members, screw holes, etc. are omitted.

The inner frame 3 has a pair of thick parts 381 whose cross section is approximately semicircular.
．． 381, and a pair of thin parts 385 whose cross sections are substantially straight.
．． 385.

A through hole 39 having a substantially rectangular cross section is formed in the center of the inner frame 3.

If the inner frame 3 has such a structure, the through hole 39 can be made wider while maintaining high strength.

Inner frame 3 of the present invention in the case of a racetrack-shaped magnetic core device
The preferred dimensions and preferred dimension ratio of the inner frame 3 shown in FIG.
The maximum wall thickness tr of the thick wall portion 381 (curved inner frame member described later)
, the wall thickness ts of the thin wall portion 385 (straight section inner frame member to be described later),
Through-hole gap β between thick parts 381 and 381, thin part 385
．． It is as follows when expressed using the through-hole gap W between 385 and the height h of the inner frame 3.

t s/w is 0.04-1, especially 0.05-0.5, t
s/j2 is 0.006 to 0.1, especially 0.01 to 0.0
It is preferable that it is 5.

If ts/w or ts/ρ is less than the above range, the strength of the inner frame tends to be insufficient.

If ts/w or ts/I2 exceeds the above range, the through hole 3
9 becomes narrow, making winding work difficult. In addition, in the case of a non-metallic bobbin, dielectric loss due to the bobbin material tends to be large.

Further, ts/h is generally O.L to 0.3.

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

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

If ts/lc or tr/lc is less than the above range, the strength of the inner frame tends to be insufficient.

If ts/lc or tr/lc exceeds the above range, the through hole 39 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.

Note that when the dimensions and dimension ratio of the inner frame are within the above range, the inner frame has sufficient strength and is extremely easy to handle during fitting.

Hereinafter, FIGS. 3 to 8 show states in which the divided inner frame members are assembled by fitting the inner frame 3 onto the core 2, and will be described according to the illustrated examples.

When the inner frame 3 shown in FIG.
and a straight part inner frame member 35.37 that is in contact with the straight part 25.27 of the core 2.

In this case, the inner frame 3 can be used for various molded sintered bodies and molded bodies as described above, but in particular, it can be used for wound bodies of magnetic alloy thin plates,
More preferably, the effect is particularly high when used in a wound body of an amorphous magnetic alloy thin plate.

Each of the curved inner frame members 31.33 has a semicircular cross section, and has linear convex portions 311.313 and 335.337 at the end of each circular arc.

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

The linear inner frame members 35, 37 each have a linear plate shape, and have a convex portion 351, 355, a convex portion 373, .
It has 377. The inner frame member usually has a plurality of screw holes for joining with the reinforcing portion.

These inner frame members 31, 33, 35, 37 are joined to each other to form an inner frame 3 having an oval outer contour with a straight portion and a through hole 39 having a rectangular cross section inside.

Each inner frame member is joined between the convex portions 311 and 351, and between the convex portions 31 and 351.
3.373 degrees, convex part 335 degrees, 355 questions and convex part 337
．． This is done by joining 377 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 done by screwing screws into the inner frame 3 from the inner peripheral side.

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 be used in any position as long as the inner frame members 31, 33, 35 and 37 can be joined to each other, and a smooth outer shape and through-hole outline are formed in a predetermined shape. . For example, as shown in FIG. 4, contrary to the inner frame 3 shown in FIG. 3, the convex portion of the straight inner frame member is engaged with the convex portion of the curved bobbin member from the outside and joined. Good too.

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

When the inner frame 3 is assembled in this way, there are through holes 3 in the inner frame 3.
9 is formed.

Therefore, the volume of the bobbin 6 can be reduced by the amount of the through hole 39. As a result, the dielectric loss due to the bobbin material is reduced by the reduction in the bobbin volume. In addition, a conductor for one turn can be inserted into the magnetic core device 1, or a winding wire can be wound for a plurality of turns.

FIG. 5 shows another example of the inner frame 3 used in the present invention.

In this case, unlike the examples shown in Figures 3 and 4,
The inner frame members 31, 33, 35, and 37 are divided into four longitudinal sections without forming any convex portions.

The inner frame members are engaged with each other at the side surfaces of the inner frame members to form an inner frame 3 having a predetermined shape and a smooth outer and inner shape.

Further, FIGS. 6 and 7 each show an example of an inner frame 3 in which two divided inner frame members are joined.

A pair of inner frame members 30.30° shown in FIG. 6 are each vertically divided into two parts symmetrically by a thick portion having a substantially semicircular cross section.

The pair of inner frame members 32.32° shown in FIG. 7 are each vertically divided into two parts by a thin portion having a substantially linear cross section.

The inner frame member 32 has convex portions 321 and 323 for joining.
The inner frame member 32° has a convex portion 321' for joining.
323'.

The inner frame 3 shown in FIGS. 6 and 7 has only one type of inner frame member, which is advantageous in manufacturing.

Further, FIG. 8 shows an example of an inner frame 3 in which inner frame members divided into three parts are joined.

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

More specifically, the inner frame member 3 has an approximately rectangular outer shape at the center.
6, an inner frame member 34.34° having a semicircular shape is joined to both ends of the frame member 6.

In the examples shown in FIGS. 6 to 8, the inner frame members are joined to each other to form an inner frame 3 having a predetermined shape and a smooth outer and inner shape.

After assembly, the inner frame 3 shown in FIGS. 3 to 8 has a high strength because a thick wall portion with a substantially semicircular cross section is formed in the curved portion 21, 23 of the core 2. Inner frame 3 is obtained. Further, since the portion of the core 2 that is in contact with the linear portions 25 and 27 has a thin linear shape, the through hole 39 can be formed even wider.

Moreover, among the inner frames, the inner frame 3 of the type shown in FIGS. 3 to 5 is particularly preferable.

Since the inner frame 3 is divided into a straight inner frame member and a curved inner frame member, each inner frame member can be manufactured more precisely (and more easily) than other types of inner frames.

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

The reinforcing portion of the magnetic core device 1 shown in FIGS. 1 and 2 is
A pair of collars 4.4 that are in contact with both outer surfaces of the core 2 and are integrated with both end faces of the inner frame 3, and a pair of collars 4.4 that are in contact with the outer peripheral surface of the core 2 and are joined together. Pressing member 5
and has.

The flange portions 4.4 each have an oval plate-like cross-sectional outline having parallel straight portions, that is, a racetrack-shaped plate.

A through hole 49 with a rectangular cross section for winding the wire is formed in the center of the collar 4, and a recess 41 for locking a presser member 5, which will be described later, is formed in the outer edge of the collar 4. Multiple pieces are formed.

Furthermore, a plurality of screw holes 43 for joining the inner frame 3 are formed in the flange portion 4 . The flange portion 4 and the inner frame 3 are joined and locked using screws (not shown).

Note that when the collar 4 and the presser member 5 do not engage, or when the collar 4 and the inner frame 3 are bonded with adhesive, the recess 41
There is no need to provide the hole 43 or the hole 391 described above.

The holding member 5 has a pair of protrusions 51 and 51, and has a substantially straight plate shape.

A plurality of presser members 5 are fixedly joined between a pair of collar portions 4.4 at predetermined intervals so as to be in contact with the outer circumferential surface of the core 2.

In this case, by providing the holding members 5 at intervals, the cooling performance of the magnetic core device 1 is improved, and as a result, the mounting system for the magnetic core device 1 can be simplified.

Note that in order to improve the cooling performance of the magnetic core device 1, the flange portion 4
and/or a structure in which the holding member 5 is partially provided, that is, a structure in which the core 2 is exposed, and the present invention is not limited to the illustrated example.

Further, in the bobbin 6 of the illustrated example, the inner frame 3, the collar portion 4, and the presser member 5 are each formed of separate members, and are configured by joining each other. The bobbin 6 may be constructed by manufacturing the portion 4 and/or the portion 4 and the pressing member 5 integrally.

Next, another example of the magnetic core device of the present invention will be explained.

FIG. 10 is a perspective view showing the magnetic core device 1 of the present invention.

The configurations of the core 2 and inner frame 3 of the magnetic core device 1 are the same as those described above.

Each of the pair of collars 4.4 is a racetrack-shaped plate, and each of the collars 4 has a cooling hole 45 formed therein. The hole 45 may have any shape including a circular shape.

A through hole 49 having a racetrack cross section for winding the winding wire is formed in the center of the flange portion 4 .

The holding member 5 has a substantially straight plate shape, and is arranged in contact with the outer peripheral surface of the core 2 at a predetermined interval.
Multiple pieces are joined in between.

In this case as well, a convex portion may be provided on the presser member 5 to engage and connect the collar portion 4 and the presser member 5, or the inner frame 3, the collar portion 4, and the presser member 5 may be manufactured integrally. The bobbin 6 may also be configured.

Moreover, FIG. 11 is a perspective view showing another example of the magnetic core device 1 of the present invention.

The configurations of the core 2 and inner frame 3 of the magnetic core device 1 are the same as those described above.

The reinforcing portion integrated into the inner frame 3 has a plurality of reinforcing members 5° formed integrally with a pair of substantially U-shaped reinforcing members.

A plurality of reinforcing members 50 are joined to the inner frame 3 at predetermined intervals so as to be in contact with the outer surface and the outer circumferential surface of the core 2.

Note that these reinforcing members 50 may be constructed by joining separate members.

Although the preferred examples of the magnetic core device 1 of the present invention have been described above, the present invention is not limited thereto.

In addition, if the core 2 is exposed, the presser member 5 is cylindrical with a non-circular shape such as a racetrack cross section;
The shape of the reinforcing part may be various, such as one that covers the entire outer circumferential surface of the core 2 or one in which the holding member 5 has a non-circular cylindrical shape such as a racetrack cross section and partially has holes. .

In addition, various tapes that are difficult to stretch may be used as the presser member 5.
A structure in which the core 2 is fixed may also be used.

Next, a method for manufacturing the magnetic core device 1 of the present invention will be explained with reference to FIGS. 2, 12, and 13, taking as an example a racetrack-shaped magnetic core device using a wound body 20 of a thin magnetic alloy plate as the core 2. do.

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 tiles.
The width is usually about 10 to 100 mm.

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. 12, such an amorphous magnetic alloy thin plate 81 and an insulating film 85 are layered and wound around, for example, a split winding frame 87, the ends are fixed, and the inner shape is A toroidal wound body 8 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 tension of the amorphous magnetic alloy thin plate 81 is 10 to 100
The tension of the insulating film 85 is preferably about 1 to 5 kg/cm2.

The dimensions of the toroidal wound body 8 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 length is about 50 to 450 mm, and the thickness is about 10 to 100 mm.

Next, the toroidal wound body 8 is removed from the split winding frame 87 and subjected to heat treatment using a heat treatment jig.

In this case, for example, a heat treatment jig 7 shown in FIG. 13 having a convex portion 71 for shape regulation and a through hole 75 for applying a magnetic field is used.

Then, the toroidal wound body 8 is inserted into a track shape at the center of the jig 7, and after sandwiching the top and bottom with plates (not shown), heat treatment is performed while holding it in a racetrack shape.

In addition, when manufacturing a core-shaped magnetic core device other than a racetrack-shaped magnetic core device, the shape of the shape-regulating convex portion 71 of the jig 7 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 below the Curie temperature Tc.
This is done below.

Usually, the applied magnetic field is about 5 to 1000°C, 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.

As shown in FIG. 2, when the inner frame 3 is composed of divided inner frame members, in order to fit the inner frame 3, it is necessary to
For example, a part of the inner frame member is placed inside the through hole 29 of No. 0, and the remaining inner frame members are slid into the joints between the inner frame members and between the wound bodies to assemble, and each member is screwed together. Connect with adhesive or other means.

Furthermore, if the inner frame 3 is manufactured by integral molding, the inner frame 3 may be slid and fitted into the through hole 29 of the wound body 20.

Note that the inner frame 3 may be fitted after joining the collar 4 to either one of the inner frames 3, or the inner frame 3 may be fitted with the collar 4 integrally formed on either one of the inner frames 3. A frame 3 may be fitted.

In the present invention, in this way, the inner frame 3 can be fitted to the wound body 20 while maintaining the curvature of the non-quality magnetic alloy thin plate after heat treatment, so that the magnetic properties of the magnetic core device 1 are not deteriorated. Therefore, a high squareness ratio and low coercive force He can be obtained.

In this case, in particular, by using divided inner frame members, the wound body 20 and the inner frame 3 can be connected without a gap, and the wound body 20
It can be fitted easily without damaging the parts.

In the manufacturing method of the present invention, since there is no step of winding the magnetic alloy thin plate around the non-circular inner frame 3, the wound body 20 does not become loose.

Next, a pair of collar portions 4.4 are joined to both outer surfaces of the inner frame 3 so as to be in contact with the outer surfaces of the wound body 20.

For joining, various adhesives may be used or screws, particularly plastic screws, may be used, but in order to achieve a strong joint, screwing is preferable.

Finally, the pressing member 5 is joined between the pair of collar portions 4.4 so as to be in contact with the outer circumferential surface of the wound body 20.

In this case, the concave portion 41 of the collar portion 4 and the convex portion 5 of the presser member 5 are
1 and may be joined using an adhesive or screws.

Note that there is no particular restriction on the order in which the collar portion 4 and the presser member 5 are joined; for example, after the presser member 5 is joined to one of the collar portions 4, this collar portion 4 and the inner frame 3 may be joined. . Furthermore, one of the collar portions 4 may have a presser member 5 integrally formed therein.

Depending on the purpose, the completed magnetic core device 1 is wound with one or more turns of a predetermined number of windings (not shown) to form a saturable reactor or the like. Any conventional known method may be used to wind the winding.

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 of the present invention can be suitably used for magnetic switches for particle accelerators and excimer lasers, switching regulators, saturable reactors for pulse compression devices, pulse transformers, and the like.

FIG. 14 shows an example of a circuit that generates compression pulses using multi-stage magnetic switches.

This circuit consists of an inductor I, saturable reactors L2 and L3 and capacitors C+, C- and C3.
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 C5 is charged, switch S
When closed, the charge on C1 passes through inductor L1 and C2
flows into.

After C1 is charged, saturable reactor L2 saturates, the impedance decreases, and charge flows to capacitor C3.

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. 12, an amorphous magnetic alloy thin plate 8
1 and an insulating film 85 are overlapped and wound around a split winding frame 87, the ends are fixed, and the inner diameter is 172 mm and the outer diameter is 212 mm.
A toroidal wound body 8 having a toroidal shape and having a thickness of 24 mm and a thickness of 24 mm was obtained.

The amorphous magnetic alloy thin plate used had an atomic composition of C0tsF.
e+, Mni S L2 B111, thickness 22 doors, width 24 mm.

The material of the insulating film was a polyamide film, and its dimensions were 6 mm thick and 28 mm wide.

When winding, the amorphous magnetic alloy thin plate 81 is
g, a tension of 36 g was applied to the insulating film 85.

Next, the toroidal wound body 8 was removed from the winding frame 87, inserted into a racetrack shape using the heat treatment jig 7 shown in FIG. 13, and then heat treated 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 29 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 Ha
Using a DC B-H measuring device, the maximum applied magnetic field was 50e.
When measured, the squareness ratio was 99% and Hc was 0.010.
It was e.

Next, after removing the wound body 20 from the racetrack shape of the jig 7, the inner frame 3 was fitted onto the wound body 20.

The inner frame 3 used is an inner frame member 31.33.3 made of a phenolic resin molded body (Bakelite) as shown in FIG.
5.37 were bonded together using an epoxy adhesive.

In this case, the inner frame 3 was attached by assembling the inner frame members 31, 33, 35, and 37 inside the wound body 20 and joining each member.

Next, a pair of racetrack-shaped collar portions 4.4 made of a phenol resin molded body were joined to both outer surfaces of the inner frame 3 by using polycarbonate screws so as to be in contact with the outer surface of the wound body 20.

Finally, a presser member 5 made of a phenol resin molded body was fixed and bonded between the pair of collar portions 4.4 with an epoxy adhesive in contact with the outer circumferential surface of the wound body 20.

In the magnetic core device 1 manufactured in this manner, the amorphous magnetic alloy thin plate and the insulating film were uniformly wound, and the wound body 20 and the inner frame 3 were fitted without any gaps. .
In addition, it was easy to handle, and no bulging of the wound body 20 or sagging of the thin plate occurred during handling.

In addition, when the squareness ratio of the magnetic core device l and Hc were measured in the same manner as above, the squareness ratio was 99%, and Hc was 0.010.
e, there was no deterioration in magnetic properties, and cooling performance was also good.

<Effect of the invention> In the magnetic core device of the present invention, the core is well protected.

Therefore, the magnetic core device can be easily handled and stored.

In particular, when a wound body of magnetic alloy thin plate is used as the core, there is a risk that the wound body may bulge, the thin plate may sag, or the thin plate may shift in the thickness direction during handling or storage of the magnetic core device. do not have.

In addition, since the inner frame is fitted into the wound body in the same shape as the wound body after heat treatment and the bobbin is attached, the magnetic core device 1 can be manufactured without changing the curvature of the magnetic alloy thin plate.

Therefore, the magnetic properties of the magnetic core bag holder 1 are not deteriorated, and excellent soft magnetic properties such as a high squareness ratio can be obtained.

Further, in the present invention, by partially providing the reinforcing portion to expose the core, the cooling performance of the magnetic core device is improved and the cooling system for the magnetic core device can be simplified.

[Brief explanation of drawings]

FIG. 1, FIG. 10, and FIG. 11 are perspective views each showing an example of a racetrack-shaped magnetic core device of the present invention. FIG. 2 is an exploded perspective view showing one example of the magnetic core device of the present invention. FIG. 3, FIG. 4, FIG. 5, FIG. 6, FIG. 7, and FIG. 8 are plan views each showing an example of the inner frame 3 used in the magnetic core device of the present invention. FIG. 9 is a perspective view showing one example of the shape of the inner frame used in the magnetic core device of the present invention. FIG. 12 and FIG. 13 are plan views for explaining the method of manufacturing the magnetic core device of the present invention, respectively. FIG. 14 is a circuit diagram of the pulse generator. FIGS. 15, 16, and 17 are plan views showing conventional racetrack-shaped magnetic core devices, respectively. FIG. 18 is a perspective view showing a conventional magnetic core device. Explanation of symbols 1...Magnetic core device 2...Core 20...Wound body 21.23...Bending portion 25.27...Straight portion 29...Through hole 3...Inner frame 30 .30', 31.32.32°, 33.34.34
35.36.37...Inner frame member 381...Thick wall portion 385...Thin wall portion 39...Through hole 391...Screw fixing hole 311.3131.321.321. 323.323
°, 335.337.351.355.373.377
...Convex portion 4...Brim portion 41...Concave portion 43...Screw fixing hole 45...Hole 47...Brim member 49...Through hole 5...Press member 50 ... Reinforcement member 51 ... Protrusion 6 ... Bobbin 7 ... Heat treatment jig 71 ... Protrusion 75 ... Through hole 8 ... Toroidal wound body 81 ... Amorphous Magnetic alloy thin plate 85... Insulating film 87... Winding frame 9... Through hole 10... Adhesive part Patent applicant T.D.K. Co., Ltd. agent Patent attorney Masu Ishii Sumima, patent attorney 1) Tatsuya 261 F I G, +5 ■ F I G, 16

Claims (12)

[Claims] (1) In a magnetic core device in which a bobbin is attached to a soft magnetic core having a continuous closed magnetic path around a through hole having a non-circular cross section, the bobbin includes an inner frame having a through hole and a reinforcing portion. the inner frame is fitted into the inner peripheral part of the core, and the reinforcing part is integrated with the inner frame so as to be in contact with the outer surface and the outer peripheral surface of the core, the core A magnetic core device characterized in that a part of the outer surface and/or outer peripheral surface of the magnetic core device is exposed. (2) The magnetic core device according to claim 1, wherein the inner frame is formed by joining two or more divided inner frame members. (3) The magnetic core device according to claim 1 or 2, wherein the reinforcing portion includes a flange portion and a pressing member that contacts the outer circumferential surface of the core. (4) The magnetic core device according to any one of claims 1 to 3, wherein the core has a racetrack shape. (5) Claim 1, wherein the core is a wound body of a magnetic alloy thin plate.
5. The magnetic core device according to any one of 4 to 4. (6) The magnetic core device according to claim 5, wherein the magnetic alloy thin plate is an amorphous magnetic alloy thin plate. (7) The magnetic core device according to claim 5 or 6, wherein the magnetic alloy thin plate is wound with a non-magnetic insulating film interposed therebetween. (8) After winding the magnetic alloy thin plate, it is heat-treated while being held in a non-circular shape, and then an inner frame is fitted to the inner periphery of the wound body, and an inner frame is fitted to the outer surface and peripheral surface of the wound body. A method for manufacturing a magnetic core device, characterized in that a reinforcing portion is integrated with the inner frame so that at least a part of the wound body is exposed. (9) The method for manufacturing a magnetic core device according to claim 8, wherein when fitting the inner frame, two or more divided inner frame members are inserted into the inner circumferential portion of the wound body and joined together to be integrated. . (10) The method for manufacturing a magnetic core device according to claim 8 or 9, wherein the reinforcing portion includes a flange portion and a pressing member that contacts the outer circumferential surface of the wound body. (11) The method for manufacturing a magnetic core device according to any one of claims 8 to 10, wherein the magnetic alloy thin plate is an amorphous magnetic alloy thin plate. (12) The method for manufacturing a magnetic core device according to any one of claims 8 to 11, wherein the magnetic alloy thin plate is wound with a nonmagnetic insulating film interposed therebetween.