JPH07220933A - Inductance element, method of manufacturing inductance element, and core case of inductance element - Google Patents

Abstract

PURPOSE:To prevent dislocation and short-circuit of coil windings by improving the smoothness and efficiency of the coil winding work and by preventing shift of winding to the gap part. CONSTITUTION:A ring core 1 with a magnetic gap 15, a core case 2 with a ring part 10 accommodating the ring core 1, and a coil winding 3 wound on the core case 2 are provided. A case side gap 14 that corresponds to the magnetic gap 15 is made in the core case 2. Projections for preventing dislocation of the winding are provided on both sides of the case side gap 14 on the inner side of the core case 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inductance element used under conditions where a DC current is superposed on a winding such as a power factor improving choke coil of a power supply device, a method of manufacturing the inductance element, and the inductance. The present invention relates to a core case used for an element.

[0002]

2. Description of the Related Art Generally, a choke coil, a transformer, etc., which is used under the condition that a direct current is superposed on a winding and which requires a high energy product, uses a magnetic core having a magnetic gap.

When an annular core formed by winding a magnetic material sheet such as an amorphous magnetic material, permalloy, or a silicon steel sheet is used as the magnetic core, a method for forming a magnetic gap in a part of the annular core is to use the annular core in advance. There are a method in which a magnetic gap is formed and then inserted into a core case, and a method in which an annular core is inserted into the core case and then a magnetic gap is formed (Japanese Patent Laid-Open No. 61-216409). In any case, when providing a predetermined number of turns around the core case,
A method has been adopted in which a non-magnetic spacer is inserted into the magnetic gap of the annular core and then the conducting wire is passed through a hole in the inner circumference of the annular core and the conducting wire is wound.

[0004]

In the conventional winding method, since the non-magnetic spacer is inserted into the magnetic gap of the annular core to wind the wire in a closed state, the work efficiency of the winding is poor. However, there is a problem in that it takes time (labor) to wind the wire (insulation-coated wire).

Therefore, it is conceivable to wind the wire through the magnetic gap without inserting the non-magnetic spacer into the magnetic gap of the annular core (or before inserting the non-magnetic spacer). In a simple core case where only the case side gap that matches the gap is formed, the wound wire may slip into the gap and come off, or the wire may rub at the gap forming end of the core case and damage the insulating coating of the wire. It was

A first object of the present invention is to provide an inductance element capable of smoothly and efficiently performing winding work, a method of manufacturing the inductance element, and a core case used for the inductance element.

A second object of the present invention is to provide an inductance element and an inductance element which can prevent the winding wire from moving to the core and case side gap portions, and can prevent the winding wire disconnection and the short circuit between the winding end portions from occurring. An object of the present invention is to provide an element manufacturing method and a core case used for the inductance element.

Other objects and novel features of the present invention will be clarified in Examples described later.

[0009]

In order to achieve the above object, an inductance element of the present invention has an annular core having a magnetic gap and an annular portion for storing a core, and the annular portion for receiving the core has the above-mentioned structure. A core case accommodating an annular core; and a winding wound around the core case. Further, a case-side gap corresponding to the magnetic gap is formed in the core case, and A protrusion is formed on the inner circumference of the core case so as to sandwich the case side gap.

Further, in the method of manufacturing an inductance element according to the present invention, the annular core is covered with the core case having the pair of protrusions, and the annular core is positioned between the pair of protrusions. And a case side gap is formed in the core case, and a winding is wound around the core case by using the magnetic gap and the case side gap.

A core case for an inductance element according to the present invention comprises an annular portion for accommodating a core, a case-side gap that traverses the annular portion, and a protrusion formed on the inner periphery of the annular portion so as to sandwich the case-side gap. It has a configuration provided.

Further, the thickness of the tip of the protrusion may be smaller than that of the base.

Further, the protrusion may be formed such that the width of the tip portion is narrower than that of the base portion.

A winding locking protrusion having a low height may be formed near the protrusion on the inner circumference of the core case.

The end of the annular portion facing the case side gap is preferably chamfered.

[0016]

In the present invention, since the core case has the core accommodating annular portion and the projecting portion formed on the inner periphery of the annular portion so as to sandwich the case side gap, the core case is covered with the annular core with the magnetic gap. When the winding is performed by winding, the wire rod can be wound (through the gap) by utilizing the gap between the annular core and the core case, and the winding work can be performed efficiently and promptly. It is possible to reliably prevent the winding from slipping off the gap portion by the portion. Further, since the winding end positions are regulated by the protrusions, the insulation distance between the winding ends can be made sufficiently large, and a short circuit accident between the winding ends can be reliably prevented.

Further, when the thickness of the tip of the protrusion is smaller than that of the base, it is possible to surely avoid the situation where the protrusion interferes with the winding work.

Further, when the width of the tip of the protrusion is narrower than that of the base, it is possible to avoid the situation where the wire rod of the winding is caught at the corner of the tip of the protrusion.

Further, when the end of the annular portion for accommodating the core facing the case side gap of the core case has a chamfered shape, the edge of the annular portion is rubbed with the wire used for winding. It is possible to prevent the insulation coating of the wire from being damaged.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of an inductance element, a method for manufacturing the inductance element, and a core case used for the inductance element according to the present invention will be described below with reference to the drawings.

A first embodiment of the present invention will be described with reference to FIGS. The first embodiment shows a case of forming an inductance element. In these figures, 1 is an annular core formed by winding a magnetic material sheet such as an amorphous magnetic material, permalloy, or a silicon steel sheet in a roll shape, and 2 Is a core case made of a heat-resistant insulating resin such as PBT (polybutylene terephthalate), and 3 is a winding in which an insulating coated wire 17 such as an enamel wire, a urethane coated wire or a polyester coated wire is wound around the core case.

3 to 5 show a state before the case side gap is formed in the core case 2.
Is an annular portion 10 for storing the core and a V formed at a position where a case side gap is provided so as to cross the annular portion 10.
It has a groove portion 11 and a pair of winding disengagement preventing projections 12 integrally formed on the inner circumference of the annular portion so as to sandwich the V groove portion 11. As shown in FIGS. 4 and 5, the core case 2 is divided into a core case body portion 2A and a core case lid portion 2B, and constitutes the core housing annular portion 10 of the core case body portion 2A. The portion has a U-shaped cross section having the core storage space 13 inside, and the core case lid portion 2B is fitted into the opening of the core storage space 13. Further, the pair of winding disengagement preventing projections 12 are formed on the inner peripheral surface of the portion of the core case body 2A that constitutes the core-accommodating annular portion 10. The pair of winding dislodgement preventing projections 12 are formed such that the thickness of the tip portion is thinner than that of the base portion (the thickness of the base portion is tapered toward the tip), and the V groove portion 11 is sandwiched therebetween. Opposing planes 18 are parallel to each other (substantially parallel to the diameter direction of the annular portion 10), and the opposite surface 19 is a tapered surface. The V formed at the position where the case side gap is provided
The groove portion 11 is composed of two tapered surfaces 16 facing each other. The reason for providing the V-shaped groove 11 in advance is that the end of the annular portion 10 facing the case-side gap when the case-side gap is formed later by cutting (for example, processing with a cutting grindstone). This is because the part has a chamfered shape.

When an inductance element is manufactured by using the core case 2 before forming the case side gap as described above, first, a magnetic gap is formed in the core housing space 13 formed in the core case body 2A of the core case 2. The front annular core 1 is inserted and arranged, the resin (adhesive) is filled in the core housing space 13, and then the core case lid portion 2B is fitted into the opening of the core housing space 13 and the core case body portion 2A. And the core case lid portion 2B are integrated. At that time, the core case body 2A is made of resin in the core storage space 13
And the core case lid portion 2B are in a mutually adhered state.

Then, the central portion of the V-shaped groove portion 11 of the core case 2 is cut by a cutting process in a direction crossing the annular ring portion 10 for storing the core, and as shown in FIG. 6 and FIG. The side gap 14 is formed and the magnetic gap 15 is formed with respect to the annular core 1. At this time, the positions of the case side gap 14 and the magnetic gap 15 are aligned, and the end surface of the core case 2 facing the case side gap 14 and the end surface of the annular core 1 facing the magnetic gap 15 are flush with each other. . Further, as shown in an enlarged manner in FIG. 8, the case side gap 14 (the magnetic gap 1
The end portion of the core-housing ring-shaped portion 10 facing 5) has a chamfered shape because the taper surface 16 of the V groove portion 11 which is formed in advance remains.

After the case side gap 14 and the magnetic gap 15 are provided in the core case 2 and the annular core 1, the winding 3 is provided by using the gaps 14 and 15 as shown in FIG. That is, the insulating coated wire 17 such as an enamel wire, a urethane coated wire, a polyester coated wire, etc. is wound around the core case 2 through the gaps 14 and 15 as indicated by an arrow P (recessed), and is wound a required number of times. Then gap 15
The spacer 40 is fitted in and is fixed to the annular core 1 together with an adhesive or the like. As a result, as shown in FIGS. 1 and 2, an annular core 1 with a magnetic gap, a core case 2 covered with the annular core 1, a winding around the core case 2, and a winding disengagement prevention An inductance element having one winding 3 whose position is regulated by the projecting portion 12 is obtained. The insulating coating is peeled off from the lead-out end of the winding wire 3 to expose the conductive wire. Further, although the spacer 40 is usually a non-magnetic material, at least a part thereof may be composed of a magnetic material.

In the first embodiment, the case where the spacer is provided is illustrated, but the spacer may be omitted.

It should be noted that the winding disengagement preventing projection 12 shown in FIG.
If the height dimension H from the inner peripheral surface of the core case 2 is equal to or larger than the wire diameter (diameter) D of the insulating coated wire 17 used for the winding 3, the required winding position regulating effect can be obtained. However, height dimension H
Is preferably less than the inner radius of the core case 2 (if it is less than the inner radius, there is less risk of hindering the winding work). If the height dimension H is set sufficiently higher than the wire diameter of the insulation-coated wire 17, a reliable position regulating effect can be obtained even in the case of a multi-layer winding structure.

Further, the gap 1 shown in FIGS.
The length L (distance between the end faces of the core and the core case facing the gap) L of the wires 4 and 15 needs to be at least the wire diameter (diameter) D of the insulating coated wire 17 used for the winding 3.

According to the first embodiment described above, the following effects can be obtained.

(1) The insulating coated wire 17 can be wound around the core case 2 covered by the annular core 1 through the case side gap 14 and the magnetic gap 15 corresponding to the case side gap 14 to facilitate the winding work. And it can be implemented quickly.

(2) Since the winding disengagement preventing projection 12 is provided integrally with the core case 2, the position of the end of the winding 3 can be regulated by this, and the positional deviation of the winding 3 can be prevented. Inconveniences such as disengagement of the winding due to the winding 3 slipping into the gaps 14 and 15 can be eliminated.

(3) Since both ends of the winding wire 3 are always regulated by the disengagement preventing projection 12 at intervals of the gaps 14 and 15 or more, both ends of the winding wire are not short-circuited.

(4) Since the winding disengagement preventing projection 12 is formed so that the thickness of the tip is thinner than that of the base, it is possible to prevent the winding disengagement preventing projection 12 from hindering the winding work. can do. If the wall thickness of the winding-off prevention protrusion 12 is uniform, the tip end of the winding-off prevention protrusion 12 when the insulating coated wire 17 is wound in the vicinity of the winding removal prevention protrusion 12. The thickness of the winding may interfere with the winding, but by reducing the thickness of the tip, it is difficult to wind due to the thickness of the tip of the winding disengagement prevention projection 12. Can be resolved. Further, the base portion of the winding dislodgement preventing projection 12 can be made thick enough to secure the strength.

(5) Since the end portion of the core-housing annular portion 10 facing the gaps 14 and 15 has a chamfered shape due to the tapered surface 16, the insulating coated wire 17 rubs against the end portion of the core case to insulate it. Damage to the coating can be reduced.

FIG. 10 shows a core case 22 used in the second embodiment of the present invention, in a state before the case side gap is formed. In this case, the core case 22 has the first
Instead of the V groove portion 11 shown in the embodiment, the cutting portion has a flat portion 23, and both sides thereof have a groove portion 25 having a tapered surface 24. The core case 22 is divided into the core case main body 22A and the core case lid 22B, and the pair of winding disengagement preventing projections 12 are provided in the same manner as in the first embodiment. The same or corresponding parts are denoted by the same reference numerals.

Then, the annular core is housed in the core case body 22A, the inside is filled with resin, the core case lid 22B is covered and integrated, and then the flat portion 23 of the groove 25 is cut. The core case 22 with a gap and the annular core having a shape similar to that of FIGS. 6 to 8 in the first embodiment by cutting the core storing annular portion 10 in a direction traversing and removing the flat portion 23. Then, the inductance element is obtained by winding the wire in the same manner as in FIG.

In the case of the second embodiment, since the central portion of the groove portion 25 which is the gap forming portion is constituted by the flat portion 23, when the gap is formed by the cutting work with a cutting grindstone or the like, the cutting tool is hit. Is stable, and the cutting position, that is, the gap position is less likely to be displaced.

11 and 12 show a core case 32 used in the third embodiment of the present invention. FIG. 11 shows a state before the case side gap is formed, and FIG. 12 shows the case side gap and the core side. The state after forming a magnetic gap is shown. Before forming the gap as shown in FIG. 11, the core case 32 has substantially V-shaped groove portions 34, which are arcuate or spherical curved surfaces 33 facing each other, instead of the V groove portions 11 shown in the first embodiment. is doing. The core case 3
2 is a core case body 32A and a core case lid 32B
And a pair of winding disengagement preventing projections 1
2 is the same as the first embodiment described above,
The same or corresponding parts are designated by the same reference numerals.

Then, the annular core is housed in the core case main body 32A, the inside is filled with resin, and the core case lid 32B is covered and integrated, and then the substantially V-shaped groove 34 is formed.
The center part of the core case 32 is cut by a cutting process in a direction crossing the core storing annular part 10, and as shown in FIG.
A case side gap 14 is formed with respect to and a magnetic gap 15 is formed with respect to the annular core 1. At this time, the positions of the case side gap 14 and the magnetic gap 15 are aligned with each other, and the core case 3 facing the case side gap 14 is located.
The end face of 2 and the end face of the annular core 1 facing the magnetic gap 15 are flush with each other. Further, the end portion of the core-accommodating annular portion 10 facing the case side gap 14 (magnetic gap 15) has a substantially V-shaped groove portion 34 formed in advance.
Since the arcuate or spherical curved surface 33 remains, it has a rounded chamfered shape. After that, an inductance element is obtained by applying windings in the same manner as in FIG.

In the third embodiment, the case side gap 1
4 and the end of the annular ring portion 10 for housing the core, which faces the magnetic gap 15, has a chamfered shape rounded by an arcuate or spherical curved surface 33. It is possible to further reduce the damage to the insulating coating due to the rubbing of the case end portion.

FIG. 13 shows a fourth embodiment of the present invention. In this case, the winding disengagement preventing projection 12A formed on the inner peripheral surface of the core case 2 has a thickness that tapers toward the tip, and the projection 12A has a wide lateral width at the base. The width is tapered and narrowed toward the tip. Core case 2 of protrusion 12A for preventing winding disengagement
The height dimension H from the inner peripheral surface is equal to or larger than the wire diameter (diameter) D of the insulating coated wire 17 used for the winding 3, and the core case 2
It is desirable that it is less than or equal to the inner radius of the. The other points are the same as those in the first embodiment described above, and the same or corresponding parts are designated by the same reference numerals and the description thereof will be omitted.

According to the fourth embodiment, the winding dislocation preventing projection 12A has a narrow lateral width at the tip thereof, and the winding disengagement preventing projection 1 has a narrow width.
It is possible to reduce the possibility that the insulating coated wire 17 is caught at the tip corner portion of 2A during winding.

FIG. 14 shows a fifth embodiment of the present invention. In this case, a structure is provided in which a winding 3A having a multilayer structure in which an insulating coated wire 17 is wound in multiple layers by using the case side gap 14 and the magnetic gap 15 is provided around the core case 2 which covers the annular core 1. Shows. The rest of the configuration is the same as that of the first embodiment described above, and the same or corresponding parts will be denoted by the same reference symbols and description thereof will be omitted.

As shown in the fifth embodiment, even in the case of the winding 3A having a multi-layer structure, the winding disengagement preventing projection 12 has the winding 3
The position of A can be regulated to prevent the winding 3A from slipping into the gap position.

FIG. 15 shows a sixth embodiment of the present invention. In this case, one columnar winding dislocation prevention protrusion 12B is formed on the inner peripheral surface of the core case 2 as the winding dislocation prevention protrusion. The rest of the configuration is the same as that of the first embodiment described above, and the same or corresponding parts will be denoted by the same reference symbols and description thereof will be omitted.

According to the sixth embodiment, the amount of resin required for molding the core case 2 integrally having the winding disengagement preventing projection 12B can be reduced, and since the shape is simple, the cylindrical winding disengagement preventing projection is formed. It is easy to mold the portion 12B.

FIG. 16 shows a seventh embodiment of the present invention. In this case, a plurality of (for example, two) cylindrical winding detachment preventing protrusions 1 are provided on the inner peripheral surface of the core case 2 as the winding detachment preventing protrusions.
2C and 12D are formed. The rest of the configuration is the same as that of the first embodiment described above, and the same or corresponding parts will be denoted by the same reference symbols and description thereof will be omitted.

According to the seventh embodiment, by providing a plurality of columnar winding disengagement preventing projections 12C and 12D, even if the insulating coated wire of the winding is relatively thin and easily bent. By controlling the positions at a plurality of positions, it is possible to prevent the winding from slipping into the gap position. Further, since the shape is simple, the protrusions 12C and 12D for preventing the columnar winding from coming off can be easily formed.

FIG. 17 shows an eighth embodiment of the present invention. In this case, a plurality of (for example, two) cylindrical winding detachment preventing protrusions 1 are provided on the inner peripheral surface of the core case 2 as the winding detachment preventing protrusions.
2C and 12D are formed, and a columnar winding end locking projection 50 having a low height is formed. Here, the cylindrical winding end locking projection 50 is composed of two winding disengagement prevention projections 1.
It is formed at a position displaced from the intermediate position between 2C and 12D in the direction away from the gap by the wire diameter of the insulating coated wire 17. The rest of the configuration is the same as that of the first embodiment described above, and the same or corresponding parts will be denoted by the same reference symbols and description thereof will be omitted.

According to the eighth embodiment, in addition to the effect of the seventh embodiment, the insulating coated wire 17 at the winding end is provided with the cylindrical winding detachment preventing projections 12C and 12D and the cylindrical winding. There is an advantage that it can be locked (sandwiched) with the end locking projection 50.

In FIGS. 15 to 17, the winding disengagement preventing projections and the winding end locking projections are cylindrical rods, but they may be prismatic rods.

FIG. 18 shows a ninth embodiment of the present invention. In this case, a thin plate-shaped winding disengagement preventing projection 12E is formed on the inner peripheral surface of the core case 2 as a winding disengagement preventing projection. The rest of the configuration is the same as that of the first embodiment described above, and the same or corresponding parts will be denoted by the same reference symbols and description thereof will be omitted.

In the case of the ninth embodiment, the thin flat plate-shaped winding dislodgement preventing projection 12E is thin overall (including the base portion) (because the thickness is uniform).
The amount of resin required for molding can be reduced, and since the shape is simple, the winding disengagement preventing projection 12E can be easily molded.

FIG. 19 shows a tenth embodiment of the present invention. In this case, the thin plate-shaped winding dislocation prevention projection 12E is formed on the inner peripheral surface of the core case 2 as the winding dislodgement prevention projection, and the thin flat plate-shaped winding end portion having a low height is locked. Projection 50
Forming A. Here, the thin plate-like winding end locking projection 50A is formed at a position displaced from the thin flat-plate winding disengagement preventing projection 12E by the wire diameter of the insulating coated wire 17 in the direction away from the gap. Has been done. The rest of the configuration is the same as that of the first embodiment described above, and the same or corresponding parts will be denoted by the same reference symbols and description thereof will be omitted.

According to the tenth embodiment, in addition to the effects of the ninth embodiment, the insulating coated wire 17 at the winding end is provided with the thin flat plate-shaped winding detachment preventing projection 12E and the thin flat plate-shaped one. There is an advantage that it can be locked (sandwiched) with the winding end locking projection 50A.

FIG. 20 shows an eleventh embodiment of the present invention. In this case, the winding disengagement preventing projection 12F formed on the inner peripheral surface of the core case 2 has a through hole penetrating from the upper surface 41 to the lower surface 42 of the winding disengagement preventing projection 12 of the first embodiment. 43
The height dimension H is the same as that of the first embodiment. Then, the insulation-coated wire 17 is wound around the core case 2 through the gap a required number of times to form the insulation-coated wire 17
After passing the end of No. 2 through the through hole 43, the insulating coating of the lead-out end is peeled off to expose the conducting wire. Then, similarly to the first embodiment, a spacer is inserted into the gap and fixed by means such as adhesion. The rest of the configuration is the same as that of the first embodiment described above, and the same or corresponding parts will be denoted by the same reference symbols and description thereof will be omitted.

According to the eleventh embodiment, the positions of the ends of the winding are fixed, and the work of mounting on the board or the like becomes easy.

The same effect can be obtained even if the through hole 43 is replaced by a through groove which penetrates the winding disengagement preventing projection 12F in the vertical direction. In addition, the protrusion 1 for preventing the winding from coming off
The same effect can be obtained even with a through hole or a groove penetrating in the thickness direction of 2F (direction from surface 18 to surface 19).

FIG. 21 shows a twelfth embodiment of the present invention. In this case, the winding disengagement preventing projections 12G formed on the inner peripheral surface of the core case 2 are inserted into the upper surface 41 and the lower surface of the pair of winding disengagement preventing projections 12 of the first embodiment, respectively. 44 (which does not need to be penetrated in the vertical direction) is provided, and after the winding work and the spacer insertion similar to those of the first embodiment are performed, a metal, resin or the like as shown in FIG. The substantially U-shaped stopper 45 is inserted and fixed in the pair of insertion holes 44 on both surfaces of the winding disengagement preventing projection. The rest of the configuration is the same as that of the first embodiment described above, and the same or corresponding parts will be denoted by the same reference symbols and description thereof will be omitted.

According to the twelfth embodiment, the substantially U-shaped stopper 45 is inserted and fixed in the pair of insertion holes 44 on both sides of the winding disengagement preventing projection 12G with the gaps 14 and 15 therebetween. It is possible to prevent the case-side gap 14 from expanding, and thus to keep the magnetic gap 15 of the annular core 1 constant.

The twelfth embodiment shown in FIGS. 21 and 22 exemplifies the stopper 45 in which the round wire has a substantially U-shape. However, an elastic leaf spring-shaped stopper is bent into a substantially U-shape. A stopper having a shape may be used (however, the insertion hole on the winding disengagement preventing projection 12G side is also adjusted to the stopper shape). If a stopper in which a leaf spring-shaped member is formed in a substantially U shape is used, the tightening is further ensured.

Further, in each of the above-mentioned embodiments, the explanation has been made on the premise that the annular core having no gap is housed in the core case having no gap and then the gap is formed by cutting or the like. In the case of a magnetic core in which it is easy (or convenient) to form a magnetic gap in advance, such as an iron core, the core case with a gap on the case side is fitted with the annular core with a magnetic gap, as shown in FIGS. After obtaining the core structure, winding may be performed as shown in FIG.

Furthermore, a plurality of windings may be provided on the outside of the core case. In this case, a transformer can be constructed.

Although the embodiment of the present invention has been described above, it is obvious to those skilled in the art that the present invention is not limited to this and various modifications and changes can be made within the scope of the claims. Let's do it.

[0065]

As described above, according to the present invention,
Since the winding disengagement preventing projection is formed on the inner circumference of the core case having the case side gap corresponding to the magnetic gap of the annular core so as to sandwich the case side gap, the winding work can be performed smoothly and efficiently. In addition, it is possible to prevent the winding from moving to the core and the gap portion on the case side, and prevent the coil from coming off and the short-circuit accident between the winding ends.

[Brief description of drawings]

FIG. 1 is a front view showing a case where an inductance element is constructed in a first embodiment of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a front view showing a state before a gap is formed in the core case and the annular core.

FIG. 4 is a bottom view of a part of which is also a cross section.

FIG. 5 is a perspective view of the same.

FIG. 6 is a front view showing a state after a gap is formed in the core case and the annular core.

FIG. 7 is a bottom view of the same.

FIG. 8 is a partial perspective view showing a winding dislodgement preventing projection formed on the core case.

FIG. 9 is a perspective view for explaining a winding method.

FIG. 10 is a perspective view showing a state before forming a gap in the core case and the annular core according to the second embodiment of the present invention.

FIG. 11 is a perspective view showing a state before forming a gap in the core case and the annular core according to the third embodiment of the present invention.

FIG. 12 is a perspective view showing a state after a gap is formed in the core case and the annular core according to the third embodiment of the present invention.

FIG. 13 is a partial perspective view showing a winding dislodgement preventing projection in the fourth embodiment of the present invention.

FIG. 14 is a front view of the fifth embodiment of the present invention with a winding portion being a cross section.

FIG. 15 is a partial perspective view showing a sixth embodiment of the present invention.

FIG. 16 is a partial perspective view showing a seventh embodiment of the present invention.

FIG. 17 is a partial perspective view showing an eighth embodiment of the present invention.

FIG. 18 is a partial perspective view showing a ninth embodiment of the present invention.

FIG. 19 is a partial perspective view showing a tenth embodiment of the present invention.

FIG. 20 is a partial perspective view showing an eleventh embodiment of the present invention.

FIG. 21 is a front view showing a twelfth embodiment of the present invention.

FIG. 22 is a perspective view showing a stopper used in the twelfth embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 annular core 2,22,32 core case 3,3A winding 10 annular ring part for core storage 11 V groove part 12,12A, 12B, 12C, 12D, 12E, 12
F, 12G Winding disengagement prevention protrusion 13 Core storage space 14 Case side gap 15 Magnetic gap 16, 24 Tapered surface 17 Insulated wire 25 Groove 33 Arcuate or spherical curved surface 34 V-shaped groove 40 Spacer 45 Stopper 50 , 50A Winding end locking projection

Claims (7)

[Claims] 1. An annular core having a magnetic gap, a core case having an annular portion for accommodating the core and accommodating the annular core in the annular portion for accommodating the core, and a core case wound around the core case. In an inductance element having a winding, a case side gap corresponding to the magnetic gap is formed in the core case, and a protrusion is formed on the inner circumference of the core case so as to sandwich the case side gap. Inductance element. 2. A core case formed by forming a pair of protrusions is covered on an annular core, and a magnetic gap is formed in the annular core so as to be located between the pair of protrusions, and the core case is formed. A method of manufacturing an inductance element, comprising forming a case-side gap in the core, and winding a winding around the core case by using the magnetic gap and the case-side gap. 3. An inductance, comprising: an annular portion for accommodating a core; a case-side gap that traverses the annular portion; and a protrusion formed on the inner circumference of the annular portion so as to sandwich the case-side gap. Element core case. 4. The core case for an inductance element according to claim 3, wherein a thickness of a tip portion of the protrusion is smaller than that of a base portion. 5. The core case for an inductance element according to claim 3, wherein a width of a tip portion of the protrusion is narrower than that of a base portion. 6. The core case for an inductance element according to claim 3, wherein a winding locking projection having a low height is formed in the vicinity of the projection on the inner circumference of the core case. 7. The end portion of the annular portion facing the case side gap has a chamfered shape.
Alternatively, the core case for an inductance element described in 6 above.