JP2003257745A - Wound-core reactor and transformer, and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wound-core reactor wherein its wound cores can be attached to the core assembling portions of a coil bobbin without using any core wrapping apparatus. <P>SOLUTION: The wound-core reactor has a coil bobbin 10, a winding 9, and wound cores 15. The wound core 15 is so configured in the form of a hollow cylinder by winding a plurality of times a flat rolled magnetic steel strip 16 that the curvature of its inner periphery coincides with the curvature of the outer periphery of the section of a core assembling portion 10a of the bobbin 10. In the hollow wound core 15, there is formed at least one gap 17 piercing through it in its axial and radial directions. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wound core type reactor including a winding and a wound core, a wound core type transformer, and a method for manufacturing them.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
Various transformers used for power conversion in various devices, voltage conversion for power distribution, and the like are provided. It is also known to increase the magnetic resistance of the transformer and use it as a reactor for protecting the equipment, suppressing abnormal voltage, etc. (reactor with a core with a gap). However, it is difficult to reduce the size and weight of a reactor such as an EI product core type transformer and a wound iron core toroidal type transformer that are increased in magnetic resistance, and the manufacturing process is complicated.

On the other hand, the present inventor has found that the coil bobbin, the winding,
Also, a wound core type transformer including a wound core has already been proposed (see Patent Document 1). The coil bobbin in the wound core type transformer has a rectangular frame shape as a whole, and includes a pair of iron core assembling parts and a pair of connecting parts for connecting the iron core assembling parts. In addition, a concave groove is provided on the entire outer circumference of the coil bobbin, and a winding is formed by winding a conductor wire in the concave groove many times. The wound iron core is formed by winding an electromagnetic steel sheet, which has been preliminarily wound into a cylindrical shape and then annealed, into the iron core assembly portion of the coil bobbin. EI product core type transformer,
Compared with other transformers such as the winding core toroidal type transformer, this winding core type transformer has good heat dissipation due to the close contact between the coil bobbin and the winding core, and can be reduced in size and weight. It has various characteristics.

However, in order to manufacture this wound core type transformer, it is necessary to wind the wound iron core around the iron core assembly portion of the coil bobbin on which the winding has been formed. It is necessary to use an embedded device. In particular,
When manufacturing a large wound core type transformer, it is necessary to use a large iron core winding device, which inevitably increases the manufacturing cost. Some wound core type transformers have a wound iron core wound around a leg portion of a winding without using a coil bobbin (for example, refer to Patent Document 2 relating to the present inventor). Equipment must be used.

[0005]

[Patent Document 1] JP-A-8-051034

[Patent Document 2] Japanese Unexamined Patent Publication No. 5-226168

[0006]

SUMMARY OF THE INVENTION In view of the above problems of the conventional reactor and transformer, the present invention is to form a wound iron core that is small and lightweight and does not use an iron core winding device. It is an object of the present invention to provide a wound-core-type reactor and a wound-core-type transformer that can achieve the above.

[0007]

Therefore, a first aspect of the present invention is to provide a wound core type reactor with a pair of iron core assembling parts having at least a part of an outer periphery of a circular arc shape, and the iron core assembling parts. A coil bobbin having a pair of connecting parts for connecting the parts, a concave groove is provided on the entire outer periphery, and a winding formed by winding a conductor a plurality of times in the concave groove of the coil bobbin,
The electromagnetic steel sheet is wound a plurality of times to form a cylinder whose inner circumference matches the curvature of the cross-section outer circumference of the iron core assembling portion, and at least one gap penetrating in the axial direction and the radial direction is formed. Provided is a wound core-type reactor, comprising: a pair of wound cores respectively assembled to the iron core assembling parts.

Since the inner circumference of the cylindrical winding core and the curvature of the outer circumference of the cross section of the iron core assembling portion are the same, the winding core and the outer circumference of the coil bobbin are in close contact with each other. Therefore, the heat generated by the winding can be efficiently radiated through the coil bobbin and the winding iron core, and the size and weight can be reduced. Further, by expanding the gap of the winding core within the elastic limit range of the magnetic steel sheet of the winding core, without impairing the characteristics of the electromagnetic steel sheet,
The winding iron core can be fitted into the iron core assembly portion of the coil bobbin. Alternatively, the magnetic steel sheets forming the winding iron core are sequentially extracted from the inner peripheral side in the axial direction of the winding iron core, and the extracted one electromagnetic steel sheet is sequentially inserted into the iron core assembly portion of the coil bobbin to form the winding iron core. It can be assembled to the assembly section. Therefore, in the wound iron core type reactor of the first invention, the wound iron core can be assembled to the iron core assembling portion of the coil bobbin without using the iron core winding device, which simplifies the manufacturing process and reduces the manufacturing cost. be able to.

The gap may form a predetermined angle with respect to the radial direction of the wound core. By changing the angle of the gap with respect to the radial direction of the wound core, the width of the gap can be adjusted, and thereby the magnetic path resistance can be adjusted. That is, as the angle of the gap with respect to the radial direction of the wound core becomes larger, the width of the gap becomes narrower and the magnetic path resistance decreases.

In order to maintain the width of the gap and the angle of the gap with respect to the radial direction of the wound core, spacers made of a non-magnetic material may be arranged in the gap.

According to a second aspect of the present invention, in a wound iron core type transformer, a pair of iron core assembling parts having at least a part of an outer periphery of a cross section in an arc shape and a pair of connecting parts for connecting these iron core assembling parts. A coil bobbin provided with a concave groove on the entire outer circumference, primary and secondary windings formed by winding a conductor a plurality of times in the concave groove of the coil bobbin, and an inner portion formed by winding a magnetic steel sheet a plurality of times. It becomes a cylinder whose peripheral curvature matches the curvature of the cross-section outer periphery of the above-mentioned iron core assembly part, and at least one gap penetrating in the axial direction of the cylinder is formed in each of the electromagnetic steel plates constituting each layer of the cylinder. The gap of the electromagnetic steel sheet constituting each layer is closed by the electromagnetic steel sheet of the adjacent layer, characterized by comprising a pair of wound iron cores respectively assembled to the iron core assembly portion,
A wound core type transformer is provided.

Since the inner circumference of the cylindrical wound iron core and the curvature of the outer circumference of the cross section of the iron core assembling portion are the same, the wound iron core and the outer circumference of the coil bobbin are in close contact with each other. Therefore, the heat generated by the winding can be efficiently radiated through the coil bobbin and the winding iron core, and the size can be reduced. In addition, since a gap is formed in the winding core, by pushing this gap within the elastic limit range of the electromagnetic steel sheet of the winding core, the winding iron core can be attached to the core assembly part of the coil bobbin without impairing the characteristics of the electromagnetic steel sheet. Can be fitted into. Alternatively, the magnetic steel sheets forming the winding iron core are sequentially extracted from the inner peripheral side in the axial direction of the winding iron core, and the extracted one electromagnetic steel sheet is sequentially inserted into the iron core assembly portion of the coil bobbin to form the winding iron core. It can be assembled to the assembly section. Therefore, the second
In the wound core type transformer of the invention of claim 1, the wound core can be assembled to the core assembly part of the coil bobbin without using the core winding device, and the manufacturing process can be simplified and the manufacturing cost can be reduced. .

The present invention can also be applied to a wound core type reactor and a wound core type transformer without a coil bobbin. That is, a third aspect of the present invention is, in a wound core type reactor, a winding formed by winding a conductor a plurality of times so that a cross-sectional shape is substantially circular, and a magnetic steel sheet being wound a plurality of times, and an inner peripheral curvature. A pair of wound iron cores wound around the legs of the winding, wherein the winding has a cylindrical shape that matches the curvature of the outer circumference of the cross section of the winding, and at least one gap that penetrates in the axial direction and the radial direction is formed. A wound-core-type reactor is provided, which comprises: Further, a fourth aspect of the present invention is, in a wound core type transformer, primary and secondary windings formed by winding a conductor a plurality of times and electromagnetic steel sheets a plurality of times so that the cross-sectional shape is substantially circular. It is wound to form a cylinder whose inner circumference curvature matches the curvature of the outer circumference of the cross section of the primary and secondary windings, and the electromagnetic steel plates forming the individual layers of the cylinder each have at least one gap penetrating in the axial direction of the cylinder. Individually formed, the gap of the electromagnetic steel sheet constituting each of these layers is closed by the electromagnetic steel sheet of the adjacent layer, a pair of wound iron cores respectively assembled to the legs of the primary and secondary windings. Provided is a wound core transformer.

According to a fifth aspect of the present invention, a strip-shaped electromagnetic steel sheet is rolled into a cylindrical shape, then annealed, and a gap penetrating the annealed cylindrical rolled steel sheet in the axial direction and the radial direction. And a method of manufacturing a winding core type transformer and a winding core type reactor, in which the electromagnetic steel sheet wound in the cylindrical shape is assembled to the leg portion of the winding formed by winding the conductor by expanding the gap. I will provide a. With this manufacturing method, it is possible to manufacture a wound core type transformer or a wound core type reactor without using an iron core winding device.

A plate-shaped jig is inserted into the gap, and the plate-shaped jig is rotated in the circumferential direction of the winding core with the tip of the plate-shaped jig in contact with the leg portion of the winding. The width of the gap may be adjusted by changing the angle of the wound core with respect to the radial direction.

According to a sixth aspect of the present invention, a strip-shaped electromagnetic steel sheet is rolled into a cylindrical shape, then annealed, and a gap penetrating the annealed cylindrical rolled steel sheet in the axial direction and the radial direction. Forming the cylindrical electromagnetic steel sheet, by assembling by pulling the gap to the leg portion of the winding formed by winding the conductor a plurality of times by sequentially pulling out the electromagnetic steel sheet from the innermost circumferential side electromagnetic steel sheet in the axial direction, A winding core type transformer and a method for manufacturing a winding core type reactor are provided. Also by this method, a wound core type transformer and a wound core type reactor can be manufactured without using an iron core winding device.

In a seventh aspect of the present invention, a strip-shaped electromagnetic steel sheet is cut into a plurality of electromagnetic steel sheet pieces each having a predetermined length, and the plurality of electromagnetic steel sheets are sequentially wound into a cylindrical winding form to form a cylinder. And the cylindrical electromagnetic steel sheet is annealed, the cylindrical electromagnetic steel sheet is drawn in the axial direction in order from the inner peripheral electromagnetic steel sheet in the axial direction, and the conductor is wound a plurality of times on the leg portion of the winding. Provided is a winding core type transformer and a manufacturing method of a winding core type reactor, which are assembled by expanding a gap. Also by this method, a wound core type transformer and a wound core type reactor can be manufactured without using an iron core winding device.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail based on the embodiments shown in the drawings.

(First Embodiment) FIGS. 1 and 2 show a wound core type transformer according to a first embodiment of the present invention. This transformer includes a coil bobbin 10 having a rectangular frame shape, a winding 9 formed by winding a conductive wire (conductor) a plurality of times, and a pair of winding cores 1.
It is equipped with 5.

As shown in FIG. 4, a concave groove 10c is provided on the entire outer circumference of the coil bobbin 10 of this embodiment. A large number of conducting wires forming the winding 9 are wound in the concave groove 10c. In FIG. 1, tr1 and tr2 schematically indicate terminals provided at both ends of these windings 9. The coil bobbin 10 has a pair of iron core assembling parts 10a in which a part of the outer circumference of the cross section (the outer peripheral surface of the part forming the side wall of the concave groove 10c) has an arc shape, and these iron core assembling parts 10a.
It has a pair of connecting portions 10b for connecting a. The winding iron cores 15 are attached to the iron core assembling portions 10a, respectively.

As shown in FIGS. 1 to 3, the wound iron core 15 is formed by winding an electromagnetic steel plate 16 such as a grain-oriented silicon steel plate a plurality of times so that the curvature of the inner circumference matches the curvature of the outer circumference of the cross section of the iron core assembling portion 10a. It becomes a cylinder. Further, the wound core 15 is formed with a gap 17 penetrating in the axial direction and the radial direction. The width t of the gap 17 is not particularly limited, but is 0.1
It is preferably about 3 mm. As shown in FIGS. 2 and 3,
In this embodiment, the gap 17 extends in the radial direction of the wound core 15 in a plan view. As shown in FIG.
A spacer 8 made of a non-magnetic material for maintaining the width and direction of the gap 17 is arranged in the space.

In FIGS. 2 and 3, there is a gap between the electromagnetic steel plates 16 forming each layer of the cylindrical wound iron core 15, but this is because the wound iron core 15 has one electromagnetic steel plate 16.
This is because it clearly shows that the magnetic steel sheets 16 are made up of, and in practice, the electromagnetic steel sheets 16 forming each layer are in close contact with each other. Also,
The number of layers of the electromagnetic steel plates from the electromagnetic steel plate 16 forming the layer closest to the coil bobbin 10 (the innermost layer) to the electromagnetic steel plate 16 forming the outermost layer is also schematically shown.
Furthermore, the width t of the gap 17 is also schematically shown. These points also apply to the other drawings.

The inner circumference of the wound core 15 has a coil bobbin 1
It is in close contact with the outer periphery of the core assembly part 10a of No. 0. Therefore, the heat generated by the winding can be efficiently radiated through the coil bobbin and the winding iron core, and the size and weight can be reduced.

Next, a method of manufacturing the wound core type reactor will be described. First, as shown in FIG. 5 (A), a strip-shaped electromagnetic steel sheet 16 having a constant width is wound many times to have a cylindrical shape, and then annealed. Next, as shown in FIG. 5 (B), one portion of the cylinder of the electromagnetic steel plate 16 is cut by a predetermined width so as to penetrate the cylinder in the axial direction and the radial direction to form the gap 17.
When the gap 17 is formed in this manner, there is one gap 17a (see FIG. 3) for each winding of the electromagnetic steel sheet 16.

The gap 17 must be formed by a cutting method that does not form so-called "burrs" or "burrs" on the electromagnetic steel plate 16. An example of such a cutting method is a wire cutting method using a wire electric discharge machine. However, the gap 17 may be formed by another method as long as “burr” or the like is not formed.

On the other hand, the concave groove 10 of the coil bobbin 10
The winding 9 is wound around each of c.

Next, as shown in FIG. 6, the portion of the gap 17 is widened and the core assembly portion 10a of the coil bobbin 10 is expanded.
The wound iron core 15 is fitted into. In order not to impair the characteristics of the electromagnetic steel plate 16, the gap 17 is formed so that the electromagnetic steel plate 16 forming each layer of the wound iron core 15 is deformed within the elastic limit.
It is necessary to limit the size to spread. Therefore, the outer diameter of the core assembly portion 10a of the coil bobbin 10 and the wound core 1
It is necessary to design the diameter of No. 5, the thickness of the electromagnetic steel plate 16, etc. so as to satisfy this condition.

A pair of core assembly parts 10 of the coil bobbin 10.
After fitting the winding cores 15 into the
The spacer 8 is arranged at. Further, for example, a band member (not shown) tightens the outer periphery of the wound core 15 to bring the layers of the electromagnetic steel plates 16 forming the wound core 15 into close contact with each other.
After that, processing such as shape retention of the winding core 15 by impregnation with varnish is performed, and the winding core type reactor is completed.

As shown in FIG. 6, instead of elastically expanding the gap 17, the layers of the electromagnetic steel plate 16 constituting the wound core 15 are pulled out in the axial direction in order from the inner peripheral side (see FIG. 7). The pulled-out layer of the electromagnetic steel plate 16 may be assembled by pressing the gap 17a against the core winding portion of the coil bobbin 10 on which the winding 9 has been wound.

As described above, in the wound core type reactor of this embodiment, since the gap 17 is formed in the wound core 15, the gap 17 is pushed within the elastic limit range of the electromagnetic steel plate 16 constituting the wound core 15. By unfolding, the wound iron core 15 can be fitted into the iron core assembly portion 10a of the coil bobbin 10. Alternatively, the electromagnetic steel plates 16 constituting the wound iron core 15 are sequentially extracted from the inner peripheral side in the axial direction of the wound iron core 15, and the extracted one electromagnetic steel plate 16 is sequentially fitted into the iron core assembly portion 10a of the coil bobbin 10. Thus, the winding iron core 15 can be assembled to the iron core assembling portion 10a. That is, the winding iron core 15 can be assembled to the iron core assembling portion 10a of the coil bobbin 10 without using the iron core winding device, and the manufacturing process can be simplified and the manufacturing cost can be reduced.

(Second Embodiment) FIGS. 8 and 9 show a second embodiment of the present invention. In the wire wound reactor of the second embodiment, the gap 1 formed in the winding core 15 is
7 forms a predetermined angle with the radial direction of the winding iron core 15 in a plan view. By thus forming the gap 17 so to speak, the width t of the gap 17 can be adjusted.

More specifically, first, as shown in FIG. 10, the annealed wound iron core 15 is attached to the iron core assembly portion 1 of the coil bobbin 10.
The plate-shaped jig 20 is inserted into the gap 17 after it is assembled to 0a. The plate-like jig 20 is rotated in the circumferential direction of the wound iron core 16 with its tip abutting against the iron core assembly portion 10a of the coil bobbin 10. By the rotation of the plate-shaped jig 20, the gaps 17a of the electromagnetic steel plates 16 of the respective layers arranged in the radial direction of the wound iron core 15 move together with the plate-shaped jig 20 in the radial direction of the wound iron core 15, and thereby, As shown in FIGS. 8 and 9, the gaps 17 a of the electromagnetic steel plates 16 of the respective layers are arranged in an angled state with respect to the radial direction of the wound core 15. As the turning angle of the plate-shaped jig 20 increases, the angle formed by the gap 17 with respect to the radial direction of the wound iron core 15 increases, and the width t of the gap 17 decreases accordingly. The magnetic path resistance decreases as the width t of the gap 17 decreases.

(Third Embodiment) FIGS. 11 to 13 show a wound core type transformer according to a third embodiment of the present invention.

In the third embodiment, the gaps 17a are formed in the electromagnetic steel plates 16 of the respective layers of the wound core 15, but as shown most clearly in FIG. 13, these gaps 17a are flat. It is arranged in a line rather than a straight line when viewed. Therefore, the gaps 17a of the electromagnetic steel plates 16 forming these individual layers are closed by the electromagnetic steel plates 16 of the adjacent layers. Therefore, the winding iron core 15
As a whole, no gap is formed.

As shown in FIGS. 14 and 15, the coil bobbin 10 according to the present embodiment has an inner frame 1 which is integrally assembled.
1 and an outer frame 12. Recessed grooves 11a and 12a are provided on the entire outer peripheries of the inner frame 11 and the outer frame 12, respectively. A conductive wire forming the primary winding 13 is wound around the concave groove 11a of the inner frame 11, and a conductive wire forming the secondary winding 14 is wound around the concave groove 12a of the outer frame 12. In FIG. 1, tr1 to tr4 are these windings 13 and 14
The input / output terminals of are schematically shown. Inner frame 11 and outer frame 1
The coil bobbin 10 in a state in which 2 is assembled includes a pair of iron core assembling portions 10a in which a part of the cross-section outer periphery (the outer peripheral surface of the portion forming the side walls of the concave grooves 11a and 12a) is arcuate,
A pair of connecting parts 10 for connecting these iron core assembling parts 10a
b. The winding iron cores 15 are attached to the iron core assembling portions 10a, respectively.

Next, a method of manufacturing the wound core type transformer of the third embodiment will be described. First, as shown in FIG. 16 (A), the belt-shaped magnetic steel sheet 16 before annealing, which is wound around a cylindrical roller 100, is unwound by a pair of unrolling rollers 101a and 101b.
And the cutter 102 cuts the tape into predetermined lengths. Through this step, as schematically shown in FIG. 16B, a large number of strip-shaped electromagnetic steel plates 16 (electromagnetic steel plate pieces 16 ') cut into a predetermined length are manufactured. The individual strip-shaped electromagnetic steel plates 16 ′ cut by the device shown in FIG.
It is not accumulated once but is continuously conveyed to the apparatus shown in FIG. Next, the electromagnetic steel sheet half 16 'is sequentially wound around the winding roller 103 by the device shown in FIG. This device is equipped with a winding roller 103.
And the guide belt 1 guided by the guide rollers 104a to 104d and fed in synchronization with the rotation of the winding roller 103.
05 and. The electromagnetic steel plate piece 16 'is the winding roller 1
03 and the guide belt 105, it is wound around the winding roller 103. The tension roller 107 is provided at the tip of the rod of the cylinder 108. Therefore, the tension of the guide belt 105 can be adjusted with respect to the increase in the winding thickness of the electromagnetic steel plate piece 16 ′ on the winding roller 103 as the rod advances and retracts.

A predetermined number of electromagnetic steel plate pieces 1 are wound on the winding roller 103.
After winding 6 ', an annealing process is performed. On the other hand, the windings 13 and 14 are wound around the concave grooves 11a and 12a of the inner frame 11 and the outer frame 12, respectively, and the inner frame 11 and the outer frame 12 are assembled.

Next, the electromagnetic steel plate 16 constituting the wound iron core 15
Are sequentially extracted from the inner peripheral side in the axial direction of the winding iron core 15, and the extracted one electromagnetic steel plate 16 is used as a gap 17
The coil core 15 can be sequentially fitted into the iron core assembling portion 10a of the coil bobbin 10 by pushing, and the wound iron core 15 can be assembled to the iron core assembling portion 10a. That is, the winding iron core 15 can be assembled to the iron core assembling portion 10a of the coil bobbin 10 without using the iron core winding device, and the manufacturing process can be simplified and the manufacturing cost can be reduced. The wound core transformer of the third embodiment can also be manufactured by the method for manufacturing wound core reactors of the first and second embodiments described with reference to FIGS. 5 to 7. On the contrary, the wound core type reactors of the first and second embodiments can be manufactured by the same method as that of the third embodiment.

Other configurations and operations of the third embodiment are as follows.
Since it is similar to the first embodiment, the same elements are assigned the same reference numerals and explanations thereof are omitted.

(Fourth Embodiment) FIG. 17 shows a fourth embodiment of the present invention.
1 illustrates a wound-core-type reactor according to an embodiment. This wound core type reactor differs from the first embodiment in that the coil bobbin 10 is not used. That is, the winding iron core 15 is attached to the leg portion of the winding wire 9 (a portion corresponding to the iron core attaching portion 10a of the coil bobbin 10) wound in a rectangular frame shape so as to have a substantially circular cross-sectional shape. The circumference of the winding 9 is protected by an insulating member 7 such as an insulating tape. Since the wound-core-type reactor of the fourth embodiment also has the gap in the wound-core 15, it can be manufactured without using the core-winding device. Specifically, the wound core type reactor of the fourth embodiment is manufactured by the manufacturing method of the wound core type reactor of the first and second embodiments and the manufacturing method of the wound core type wound core of the third embodiment. You can

(Fifth Embodiment) FIG. 18 shows a fifth embodiment of the present invention.
1 illustrates a wound core transformer according to an embodiment. This wound core type transformer is different from the third embodiment in that the coil bobbin 10 is not used. That is, the primary and secondary windings 13 wound in a rectangular frame shape so as to have a substantially circular cross section,
A winding iron core 15 is attached to the legs of 14. Winding 13,
The periphery of 14 is protected by an insulating member 7 such as an insulating tape. An insulating member 6 is provided between the primary and secondary windings 13 and 14. Since the wound core type transformer of the fifth embodiment also has the gap in the wound core 15, it can be manufactured without using the core winding device.
Specifically, the wound core type reactor of the fifth embodiment is a method for manufacturing the wound core type reactors of the first and second embodiments,
And it can be manufactured by the manufacturing method of the wound core type wound core of the third embodiment.

In the wound type reactor and wound core type transformer of the first to fifth embodiments, the wound iron core 15 is provided with one gap 17 for each turn of the electromagnetic steel plate 16. However, the number of the gaps 17 is not limited to one and may be two or more. For example, like the wound core type reactor shown in FIG. 19, two gaps 17 may be provided for each turn of the electromagnetic steel plate 16 that constitutes the wound core 15.

[0043]

As is apparent from the above description, in the wound core type transformer and wound core type reactor of the present invention, the curvature of the inner circumference of the cylindrical winding core and the curvature of the outer circumference of the cross section of the iron core assembling portion. Since they match, the wound core and the outer circumference of the coil bobbin come into close contact with each other. Therefore, the heat generated by the winding can be efficiently radiated through the coil bobbin and the winding iron core, and the size can be reduced.

Further, since the winding core has a gap formed therein, the winding core can be fitted into the core assembly portion of the coil bobbin by expanding the gap within the elastic limit range of the electromagnetic steel sheet of the winding core. . Alternatively, the magnetic steel sheets that form the winding core are sequentially extracted from the inner peripheral side in the axial direction of the winding core, and the extracted one electromagnetic steel sheet is sequentially fitted into the iron core assembly portion of the coil bobbin to form the core assembly. Can be attached to the attachment part. Therefore, the wound core can be assembled to the core assembly part of the coil bobbin without using the core winding device, and the manufacturing process can be simplified and the manufacturing cost can be reduced.

Further, before annealing the wound core, a plate-shaped jig is inserted into the gap, and the plate-shaped jig is attached to the coil bobbin with its tip abutting against the core assembly part of the coil bobbin. Rotate in the circumferential direction to adjust the width of the gap,
The magnetic path resistance can be adjusted.

[Brief description of drawings]

FIG. 1 is a perspective view showing a wound core type reactor according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a partially enlarged plan view showing a gap of a wound iron core according to the first embodiment.

FIG. 4 is a perspective view showing a coil bobbin.

5A is a perspective view showing a wound core before forming a gap, and FIG. 5B is a perspective view showing a wound core after forming a gap.

FIG. 6 is a schematic plan view for explaining an attaching operation of the winding iron core to the iron core attaching portion.

FIG. 7 is a perspective view showing a one-layer electromagnetic steel sheet extracted from a wound iron core.

FIG. 8 is a cross-sectional view showing a wound core type reactor according to a second embodiment of the present invention.

FIG. 9 is a partially enlarged plan view showing a gap of a wound iron core according to the second embodiment.

FIG. 10 is a partial enlarged plan view for explaining a method for adjusting the gap of the wound iron core.

FIG. 11 is a perspective view showing a wound core type transformer according to a third embodiment of the present invention.

12 is a sectional view taken along line XII-XII in FIG.

FIG. 13 is a partially enlarged plan view showing a gap of a wound iron core according to the third embodiment.

FIG. 14 is a perspective view showing a coil bobbin.

FIG. 15 is an exploded perspective view showing a coil bobbin.

FIG. 16 is a schematic view showing a method of manufacturing a wound iron core by a one-cut turn, (A) unwinding and cutting,
(B) shows a cut steel plate, and (C) shows winding.

FIG. 17 is a sectional view showing a wound core type reactor according to a fourth embodiment of the present invention.

FIG. 18 is a sectional view showing a wound core type transformer according to a fifth embodiment of the present invention.

FIG. 19 is a sectional view showing a wound core type reactor and a wound core type transformer of a modified example of the invention.

[Explanation of symbols]

8 spacers 9,13,14 winding 10 coil bobbins 10a Iron core assembly part 10b connection part 11 inner frame 11a concave groove 12 outer frame 12a concave groove 15 winding iron core 16 Magnetic steel sheet 17,17a Gap 20 Plate jig

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Claims (14)

[Claims] 1. A wound core-type reactor comprising: a pair of iron core assembling parts, at least a part of the outer periphery of which is arcuate, and a pair of connecting parts for connecting these iron core assembling parts, and the whole outer periphery. A coil bobbin provided with a recessed groove, a winding formed by winding a conductor a plurality of times around the recessed groove of the coil bobbin, and an electromagnetic steel plate wound a plurality of times so that the inner circumference has a curvature of the cross-section outer circumference of the core assembly part. A pair of wound iron cores that are respectively fitted to the iron core assembling parts, each of which has a cylindrical shape that matches the curvature, and at least one gap that penetrates in the axial direction and the radial direction is formed. Roll core type reactor. 2. The wound core type reactor according to claim 1, wherein the gap makes a predetermined angle with respect to a radial direction of the wound core. 3. The wound core type reactor according to claim 1, wherein a spacer made of a non-magnetic material is arranged in the gap. 4. A wound iron core transformer, comprising: a pair of iron core assembling parts having at least a part of an outer periphery of a circular arc shape, and a pair of connecting parts connecting these iron core assembling parts, and a whole outer periphery. The coil bobbin is provided with a concave groove on the primary and secondary windings, each of which is formed by winding a conductor a plurality of times around the concave groove of the coil bobbin. At least one gap penetrating in the axial direction of the cylinder is formed in each of the electromagnetic steel plates that form the individual layers of the cylinder, and the electromagnetic waves that form these individual layers are formed. A wound-core-type transformer, comprising: a pair of wound iron cores, each of which is assembled to the above-mentioned iron core assembling part, wherein a gap between the steel plates is closed by electromagnetic steel sheets of adjacent layers. 5. A wound core type reactor having a winding formed by winding a conductor a plurality of times so as to have a substantially circular cross-sectional shape, and a plurality of windings of an electromagnetic steel sheet having an inner circumference having a curvature of the cross section of the winding. A pair of wound iron cores wound around the leg portions of the above-mentioned winding, which is a cylinder that matches the curvature of the outer circumference and has at least one gap that penetrates in the axial direction and the radial direction. It is a wound core type reactor. 6. A wound-core transformer, wherein primary and secondary windings are made by winding a conductor a plurality of times, and electromagnetic steel sheets are wound a plurality of times so as to have a substantially circular cross-sectional shape. It is a cylinder whose curvature matches the curvature of the outer circumference of the cross section of the primary and secondary windings, and at least one gap penetrating in the axial direction of the cylinder is formed in each of the electromagnetic steel plates constituting the individual layers of the cylinder. A wound core type transformer having a pair of wound iron cores assembled to the legs of the primary and secondary windings, wherein the gaps between the electromagnetic steel sheets forming the individual layers are closed by the electromagnetic steel sheets of the adjacent layers. . 7. A method of manufacturing a wound core-type reactor, comprising the steps of: winding a strip-shaped electromagnetic steel sheet into a cylindrical shape and then annealing; and annealing and annealing the rolled electromagnetic steel sheet into a cylindrical shape. And a step of assembling the electromagnetic steel sheet wound in the cylindrical shape by expanding the gap to the leg portion of the winding in which the conductor is wound a plurality of times. A method for manufacturing a wound core type reactor. 8. A plate-shaped jig is inserted into the gap, and the plate-shaped jig is rotated in the circumferential direction of the winding core in a state where its tip end is in contact with the leg portion of the winding. The method according to claim 7, further comprising the step of adjusting the width of the gap by changing the angle of the gap with respect to the radial direction of the wound core. 9. The manufacturing method according to claim 7, further comprising the step of inserting a spacer made of a non-magnetic material into the gap. 10. A method of manufacturing a wound core type reactor, comprising a step of rolling a strip-shaped electromagnetic steel sheet into a cylindrical shape and then annealing, and an axial direction and a radial direction of the annealed cylindrical rolled steel sheet. And a step of forming a gap penetrating through, the cylindrical electromagnetic steel sheet, in order from the innermost peripheral electromagnetic steel sheet in the axial direction in order to extract the gap in the leg portion of the winding formed by winding the conductor a plurality of times. A method of manufacturing a wound core-type reactor, comprising the step of assembling by expanding. 11. A method of manufacturing a wound core type reactor, comprising the steps of cutting a strip-shaped electromagnetic steel sheet into a plurality of electromagnetic steel sheet pieces each having a predetermined length, and forming the plurality of electromagnetic steel sheet pieces into a cylindrical winding die. A step of sequentially winding and forming a cylindrical shape having a gap for each electromagnetic steel sheet piece, a step of annealing a plurality of the cylindrical electromagnetic steel sheet pieces, and an innermost peripheral side of the cylindrical electromagnetic steel sheet pieces Of the electromagnetic steel sheet in the axial direction, and then assembling the conductor by winding the conductor a plurality of times by expanding the gap to the leg portion of the winding, and then assembling the wound core-type reactor. 12. A method of manufacturing a wound core type transformer, comprising the steps of rolling a strip-shaped electromagnetic steel sheet into a cylindrical shape and then annealing, and the axial direction and diameter of the annealed cylindrical electromagnetic steel sheet. The step of forming a gap that penetrates in the direction, and the legs of the primary and secondary windings formed by winding the conductor multiple times,
And a step of assembling the electromagnetic steel sheet wound in the cylindrical shape by expanding the gap, the method for producing a wound core type transformer. 13. A method of manufacturing a wound core type transformer, comprising a step of rolling a strip-shaped electromagnetic steel sheet into a cylindrical shape and then annealing, and an axial direction and a diameter of the annealed cylindrical rolled steel sheet. And a step of forming a gap penetrating in the direction, the cylindrical electromagnetic steel sheet is drawn out in the axial direction in order from the innermost electromagnetic steel sheet, and primary and secondary winding legs are formed by winding the conductor a plurality of times. And a step of assembling by expanding the above-mentioned gap to a portion. A manufacturing method of a wound core type transformer. 14. A method for manufacturing a wound core type transformer, the method comprising cutting a strip-shaped electromagnetic steel sheet into a plurality of electromagnetic steel sheet pieces each having a predetermined length, and a cylindrical winding die for the plurality of electromagnetic steel sheet pieces. And a step of forming a cylindrical shape having a gap for each electromagnetic steel sheet piece, a step of annealing a plurality of the cylindrical electromagnetic steel sheet pieces, and an innermost circumference of the cylindrical electromagnetic steel sheet pieces From the side electromagnetic steel sheet in this order, and then assembling the conductor by winding the conductor a plurality of times and expanding the gap to the legs of the primary and secondary windings to assemble it. Manufacturing method.