JP2001135533A - Semi-closed magnetic domain inductor and producing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a saturation current value and an inductance value uniform to prescribed values by making a facing interval and a facing area between the cross sections of a semi- closed magnetic domain annular magnetic core, for which one part of the loop of a closed magnetic domain annular magnetic core constituted by winding or laminating a magnetic alloy thin band is cut and locally made into opened magnetic domain, uniform to prescribed values when forming a semi-closed magnetic domain annular inductor by separating the cross sections of the semi-closed magnetic domain annular magnetic core and inserting them to a cylindrical coil, which is formed by winding a lead wire around the semi-closed magnetic domain annular magnetic core, while annularly bending the cylindrical coil beforehand. SOLUTION: Concerning the semi-closed magnetic domain inductor, with which the cylindrical coil formed by winding the lead wire is formed beforehand and one part of the loop of the closed magnetic domain annular magnetic core formed by winding or laminating the magnetic alloy thin band is cut and inserted from the separated cross sections to the cylindrical coil, the facing interval and the facing area between the cross sections of the magnetic core are made uniform to prescribed values inside a frame fitted to a cutting part. Besides, a screw through the side wall of a case while fixing the cutting part of this annular magnetic core at a projecting part inside the case is abutted near the cutting part of the annular magnetic core so that the facing interval and the facing area between the cross sections of the magnetic core can be adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inductance element, and more particularly to a semi-closed magnetic circuit inductor having a small inductance value deviation, and an adjustable semi-closed magnetic circuit inductor, which is included in a case.

[0002]

2. Description of the Related Art Conventionally, closed magnetic circuit inductors have been widely used to reduce noise generated in electronic devices.
The closed magnetic circuit inductor is formed by winding or laminating a magnetic alloy thin ribbon around a magnetic material, or by winding a round copper wire around a closed magnetic circuit annular magnetic core made of ferrite.

When a DC current is superimposed on a choke inductor or a common mode inductor used in a DC power supply, magnetic saturation occurs. Therefore, a part of a ring of a closed magnetic circuit annular magnetic core is cut to partially open an open magnetic circuit. A semi-closed magnetic path annular inductor formed by winding a urethane resin-coated copper wire around the semi-closed magnetic path annular magnetic core is used.

A winding machine for winding a magnetic material on a ring magnetic core is stored in a storage ring intersecting with the ring magnetic core, and is wound around a center axis of the ring magnetic core by rotating the ring. Winding machines of the type that winds while passing the center line of the core one turn at a time are also on the market, but in both cases, the winding machine becomes more complicated than when winding on a rod-shaped core. The efficiency of the wire is poor,
There were difficulties in manufacturing small closed-circuit inductors.

[0005] As disclosed in Japanese Patent Application No. 11-256918, a cylindrical coil formed by winding a conductive wire in advance and a closed magnetic circuit ring formed by winding a magnetic alloy ribbon are used. A method has been proposed in which a part of the coil is cut, inserted into the cylindrical coil from the separated cut surface, and the cut surfaces are joined to form a semi-closed magnetic circuit annular inductor.

[0006] However, when a semi-closed magnetic circuit annular inductor is manufactured by this method, when the cut surfaces of the semi-closed magnetic circuit annular magnetic core that are separated from each other are joined, the magnetic saturation current is determined by the opposing interval and opposing area of the cut surfaces. Since the value and the inductance value are determined, it is important to equalize the facing interval and the facing area of the cut surface to a predetermined value.

[0007]

SUMMARY OF THE INVENTION A semi-closed magnetic circuit annular magnetic core in which a part of a ring of a closed magnetic circuit annular magnetic core formed by winding or laminating a magnetic alloy ribbon is partially cut to form a locally open magnetic circuit is formed. A cylindrical coil formed by winding a conductive wire is bent in an annular shape in advance, the cut surface of the semi-closed magnetic circuit annular magnetic core is separated, inserted into the cylindrical coil, and the cut surface is joined. In the method of forming the semi-closed magnetic circuit annular inductor, when joining the separated cut surfaces of the semi-closed magnetic circuit annular magnetic core, the opposing interval and the opposing area of the cut surface of the magnetic core of the semi-closed magnetic circuit annular inductor are predetermined. That is, the saturation current value and the inductance value are equalized to predetermined values.

Further, in the semi-closed magnetic circuit annular inductor, a structure is provided in which the facing space or the facing area of the cut surface of the separated semi-closed magnetic circuit annular magnetic core can be adjusted, so that the magnetic saturation current value and the inductance value can be adjusted. An object of the present invention is to provide the semi-closed magnetic circuit annular inductor that can be adjusted to a predetermined value from outside the case.

[0009]

According to a first aspect of the present invention, there is provided a closed-magnetic-path annular magnetic core formed by winding a conductive wire in advance and forming or winding a magnetic alloy ribbon. In the semi-closed magnetic circuit inductor formed by cutting a part of the cut and inserted into the cylindrical coil from the separated cut surface, the semi-closed magnetic circuit inductor characterized in that the cut portion is fixed from the outside is there.

After winding and winding a magnetic alloy ribbon, and impregnating and curing a flexible resin between layers of the alloy ribbon, a part of the ring is cut to form a semi-closed magnetic circuit annular magnetic core. Next, the cut surface is separated in a direction in which the semi-closed magnetic circuit annular magnetic core formed by winding or laminating the magnetic alloy ribbon is easily deformed, and the conductive wire is wound to form a semi-closed magnetic circuit annular inductor element.

A semi-closed magnetic circuit inductor characterized in that a cut portion of a semi-closed magnetic circuit core is fixed from the outside by interposing a spacer having a predetermined thickness as necessary between the separated cut surfaces. is there. Thereby, the saturation current value and the inductance value can be equalized to predetermined values.

A second aspect of the present invention is a semi-closed magnetic circuit core obtained by cutting a part of a ring of a closed magnetic circuit annular magnetic core formed by winding or laminating a magnetic alloy ribbon, and a conductive wire wound around the magnetic core. Wherein the cut portion of the semi-closed magnetic path core is fixed in the frame.

The semi-closed magnetic circuit annular magnetic core formed by winding or laminating a magnetic alloy thin strip is separated from the cut surface in a direction in which deformation is easy, and a conductive wire is wound to form a semi-closed magnetic circuit annular inductor element. Next, since the outer periphery of the annular magnetic core deformed by forming the cut surface is regulated and returns to the original annular shape, a U-shaped or square-shaped frame is fitted into the separated cut portion, The area and interval facing the cut surface are regulated and fixed.

A third aspect of the present invention provides a semi-closed magnetic circuit core obtained by cutting a part of a ring of a closed magnetic circuit annular magnetic core formed by winding or laminating a magnetic alloy ribbon, and a conductive wire wound around the magnetic core. Wherein the cut portion of the semi-closed magnetic circuit core is fixed by a projection inside the case.

The closed magnetic path annular magnetic core formed by winding a magnetic alloy ribbon is separated from the cut surface on the radial surface passing between the center axis and the cut surface, which is likely to cut a part of the ring and deform. The circle is shifted inward and outward. Further, the closed magnetic path annular magnetic core formed by laminating the magnetic alloy thin strips is separated in the vertical direction in which a part of the ring is easily cut and deformed. The wound semi-closed magnetic path inductor is fixed to a plurality of protrusions in the case by abutting the outer periphery of the magnetic core, the outer periphery of the magnetic core is regulated, and the cut surface of the magnetic core faces the cut surface. A semi-closed magnetic circuit inductor is provided in which the interval and the area are regulated to predetermined values, and the saturation current value and the inductance value are made uniform to predetermined values.

According to a fourth aspect of the present invention, in the semi-closed magnetic circuit inductor, the cut portion of the semi-closed magnetic circuit core is fixed by abutting the outer periphery of the annular magnetic core on a plurality of inclined side wall protrusions inside the case. A semi-closed magnetic circuit inductor characterized in that a cut surface is pressed in contact via a spacer.

The closed magnetic path annular magnetic core formed by winding the magnetic alloy ribbon is separated from the cut surface on the radial surface passing between the central axis and the cut surface, which is likely to cut a part of the ring and deform. It is shifted to the inside and outside of the circle, wound and stored in the case. At this time, the outer periphery of the magnetic core is accommodated in contact with the plurality of inclined protrusions of the side wall, the outer periphery of the magnetic core is regulated, and the spacer having a predetermined thickness is pressed against the cut surface of the magnetic core. A semi-closed magnetic circuit inductor is provided in which the spacing between the cut surfaces of the magnetic core is regulated to a predetermined value and the saturation current value and the inductance value are made uniform to the predetermined values.

According to a fifth aspect of the present invention, in the semi-closed magnetic circuit inductor, a screw penetrating a side wall of the rectangular case, which is formed by cutting a corner in a plan view, is fixed in contact with a vicinity of a cut portion of the semi-closed magnetic circuit core. And a semi-closed magnetic circuit inductor.

Since the magnetic core of the semi-closed magnetic circuit annular inductor element has elasticity, the area of the cut surface once separated can be adjusted from the outside of the case with a screw penetrating the case outer wall. Further, when a semi-closed magnetic path inductor element is accommodated in a rectangular case, the case corner in a plan view is approximately 3 mm.
Small, semi-closed magnetic path that has a square wall thickness, cuts out the corners of the case and arranges screws to provide sufficient wall thickness, and occupies less floor space than the case where it is arranged on the sides of the case. An inductor can be formed. Further, since the facing area of the cut surface of the magnetic core changes with the rotation of the screw, the saturation current density and the inductance value can be adjusted to desired values.

According to a sixth aspect of the present invention, in the semi-closed magnetic path inductor, a cut portion of the semi-closed magnetic path magnetic core is provided between the protrusion provided on the inner bottom surface of the case and the protrusion provided on the upper surface of the case. A semi-closed magnetic circuit inductor that is sandwiched and fixed.

A closed magnetic circuit annular magnetic core formed by laminating magnetic alloy ribbons is easy to deform by cutting a part of the ring. The cut surface is separated in the vertical direction perpendicular to the lamination surface, so that it has a spring washer shape. Then, a winding is applied to form a semi-closed magnetic circuit inductor element, and the element is housed in the hollow portion of the case. Since the semi-closed magnetic circuit inductor element is pushed into the hollow part of the case and accommodated,
The cut portion of the magnetic core is sandwiched between the protrusion provided on the inner bottom surface of the case and the protrusion provided on the upper surface of the case, and the opposing interval of the cut magnetic core surface is regulated to a predetermined value. Therefore, a semi-closed magnetic circuit inductor having a uniform saturation current value and inductance value to predetermined values is obtained.

According to a seventh aspect of the present invention, in the semi-closed magnetic circuit inductor, a screw penetrating an upper surface or a bottom surface of the case abuts and is fixed near a cut portion of the semi-closed magnetic circuit core. Circuit inductor.

A cylindrical coil formed by winding a conductive wire in advance, and a cutaway surface of a semi-closed magnetic circuit annular magnetic core formed by laminating magnetic alloy ribbons and having a part of a ring cut. To form a semi-closed magnetic circuit annular inductor element, house the element in the hollow portion of the case, and abut a screw passing through the top or bottom surface of the case near the cut portion of the magnetic core. This is a semi-closed magnetic circuit inductor.

Since the magnetic core of the semi-closed magnetic circuit annular inductor element has elasticity, the area of the cut surface once separated is determined by contacting a screw penetrating the top or bottom surface of the case with the vicinity of the cut portion of the magnetic core. Therefore, the semi-closed magnetic circuit inductor having a predetermined saturation current value and a predetermined inductance value by adjusting the distance between the cut surfaces of the magnetic core to predetermined values can be obtained. .

According to an eighth aspect of the present invention, in the method of manufacturing a semi-closed magnetic circuit inductor, a tubular coil formed by winding a conductive wire is formed in advance and a closed magnetic circuit ring formed by winding or laminating a magnetic alloy ribbon. A part of the ring of the magnetic core is cut and inserted into the cylindrical coil from the separated cut surface to form a semi-closed magnetic circuit inductor element, and the cut part of the semi-closed magnetic circuit core is fixed from the outside. This is a method for manufacturing a semi-closed magnetic circuit inductor.

A closed magnetic path annular magnetic core formed by winding a conductive wire to form a cylindrical coil and winding or laminating a magnetic alloy ribbon in advance using a core slightly larger than the cut surface of the magnetic core. A part of the ring is cut to diverge the cut surface, and the diverged cut surface is inserted into the cylindrical coil to form a half-magnetic-path inductor element. Next, the cut-off portion of the semi-closed magnetic circuit core of the semi-closed magnetic circuit inductor element is fixed from the outside, and the interval and the opposing area of the separated cut surfaces are fixed to predetermined values to obtain a saturation current value and an inductance value. Is a method of manufacturing a semi-closed magnetic circuit inductor that sets a predetermined value.

According to a ninth invention, in the semi-closed magnetic circuit inductor and the method of manufacturing the same, the thickness range is 5 μm to 25 μm.
A semi-closed magnetic circuit inductor characterized by using a closed magnetic circuit annular magnetic core formed by winding or laminating a thin plate of an amorphous nanocrystalline alloy of m, and a method of manufacturing the same.

According to a tenth aspect, in the semi-closed magnetic circuit inductor and the method of manufacturing the same, the volume is 0.05 cc to 5 cc.
A semi-closed magnetic circuit inductor characterized by being in the range of 0 cc.

The annular core obtained by winding or laminating a magnetic alloy ribbon and cutting a part according to the present invention needs to be flexible in order to separate the cut surface. As the magnetic alloy ribbon becomes thinner, the laminated magnetic core becomes more flexible. However, due to manufacturing problems, a thickness of 5 μm or more is an appropriate thickness, and a thickness of 25 μm or more causes eddy current loss at high frequencies. Is increased, and the high-frequency characteristics of the inductor are degraded. Therefore, the thickness range is an appropriate range where 5 μm to 25 μm can be realized.

The thickness of the amorphous nanocrystalline alloy made of a magnetic material of Fe, Zr, Nb, B or the like is 5 μm to 5 μm.
By using an annular magnetic core formed by winding or punching a 25 μm ribbon into a predetermined shape and then laminating the same, the saturation magnetic density is higher than that of the conventional Mn—Zn ferrite core as shown in FIG. It is possible to realize a small semi-closed magnetic circuit inductor that is difficult to perform. As a thin ribbon of an amorphous nanocrystalline alloy, it is difficult to produce a thin plate of 5 μm or less, but unless it is at least 25 μm or less, the flexibility of the semi-closed magnetic circuit annular magnetic core is impaired, and the cut surfaces facing each other are separated. The interval is not sufficient, and the work of inserting the coil into the cylindrical coil becomes difficult. From the viewpoint of magnetic properties, if the thickness of the ribbon is 25 μm or more, eddy current loss at high frequencies cannot be ignored and the loss increases.
It is necessary that the thickness be 5 μm or less.

More specifically, in the method of manufacturing a semi-closed magnetic circuit inductor according to the present invention for solving the above-mentioned problems, first, a magnetic alloy ribbon is wound to form an annular magnetic core having a predetermined shape, and urethane or the like is formed. A flexible resin is impregnated to cure the adhesive, and a slit is cut by a diamond cutter on one of the lines passing through the rotation center axis of the magnetic core, and as shown in the plan view of FIG. The cut surface 5 is separated. In this case, one of the cut surfaces is spread outward on the same plane. A flexible resin, such as urethane, impregnated into the above-mentioned annular magnetic core and adhesively hardened, does not damage the insulating coating of the coil when inserted into the cylindrical coil, and the magnetic core and the coil are short-circuited. It is necessary to form such a thickness that it does not.

Alternatively, a plurality of punched pieces in the form of a so-called spring washer in a state where a part of an annular shape is cut without winding the magnetic alloy ribbon shown in FIG. The semi-closed magnetic path core may be formed by laminating, impregnating with a flexible resin and bonding, and the cut surface 5 may be separated. In this case, both cut surfaces are shifted in the thickness direction of the semi-closed magnetic circuit core.

Next, a predetermined number of turns of a conductive wire are wound around a rod-shaped core having a cross section slightly larger than the cross section of the semi-closed magnetic path core to form a cylindrical coil. In FIG. 5, the cross section of a closed magnetic circuit annular magnetic core formed by winding or laminating a magnetic alloy ribbon showing a cylindrical coil wound with a flat wire 6 is rectangular, so that the core also has a rectangular prism shape with a rectangular cross section. Become. The dimension of the prismatic core may be at least 1 mm larger than the thickness of the semi-closed magnetic core, but the width of the semi-closed magnetic core may be an annular coil between the outer circumferential lines. The dimensions of the core have more room to spare. In the case of a multilayer wound coil, it is difficult to bend when it is bent in an annular shape, so that there is more room. In particular, it is necessary in the width direction of the annular magnetic core.

Although a copper round wire is used for the winding of the ordinary cylindrical coil, if a rectangular wire is used to increase the current capacity with the same number of turns, the cross-sectional area of the rectangular wire is compared with the cross-sectional area of the round wire. It is advantageous because it is large. In particular, when a rectangular wire having a narrow cross section and a high height is used, a semi-closed magnetic circuit inductor having a large number of turns and a large current capacity can be formed.

The cylindrical coil is wound around the rod-shaped core and then removed, and the surface corresponding to the inner peripheral portion of the semi-closed magnetic circuit inductor is joined between flexible wires with a flexible resin. This allows
When inserting the semi-closed magnetic path core from the separated cut surface while bending the cylindrical coil in an annular shape, the inner coil of the annular coil is joined so that the work can be performed without separation. It will be easier. When the wire is thick and hard,
Multi-layered coils are difficult to commercialize, but when the wire is thin and soft, a multi-layered coil can be commercialized.

At this time, when the cylindrical coil is bent in an annular shape, the outer peripheral side is expanded. Therefore, in order to facilitate the expansion, it is preferable that the coil wound in multiple layers for each unit length of the cylindrical coil is entirely divided and wound. It is preferable because the outer peripheral side is easily spread at the divided portion of the multilayer-wound coil when it is flexed annularly. Further, since the semi-closed magnetic path core is inserted while sliding into the cylindrical coil which is bent in an annular shape, the allowance between the core and the inside of the coil depends on the shape of the magnetic core, but 1 mm to 1 mm.
It is necessary to provide a range of about 0 mm.

For joining the cut surfaces of the magnetic core, a thermosetting resin such as an epoxy resin having heat resistance and mechanical strength is used, and the joining surfaces are made smooth and closely joined. When the gap is made as small as possible, the effective magnetic permeability is reduced. I can take it big. Further, in the case where magnetic saturation occurs due to direct current superposition, magnetic saturation can be avoided by joining the space between the joining surfaces via a spacer of a predetermined thickness to make the joint an open magnetic path with a predetermined gap. At this time, since the magnetic core has elasticity, it is preferable that the resin be fixed with a U-shaped or square-shaped frame and then cured with the resin. Further, the outer frame can be fitted and fixed using the restoring force due to the elasticity of the magnetic core without joining with the resin.

When a thick annular magnetic core is formed, a thin ribbon having a width corresponding to the thickness of the magnetic core is wound and formed, and the direction of separating the opposing cut surfaces is as shown in FIG. One cut surface 5 is spread out from the annular magnetic core on the plan view and separated therefrom. Conversely, in the case of forming a thin annular magnetic core, the ribbon is punched out into a predetermined substantially spring washer shape, laminated to form an annular magnetic core, and the direction in which the opposing cut surfaces are separated is shown in FIG. The two cut surfaces 5 are separated from each other in the thickness direction of the annular magnetic core. In any case, if the magnetic ribbon is formed of a sufficiently thin plate, the workability is improved since the magnetic ribbon is easily bent.

If the shape of the semi-closed magnetic path inductor is too small, the winding structure becomes difficult, and an insulating magnetic paste and a silver paste are alternately printed, and a printed multilayer structure integrally sintered and a magnetic green sheet are formed. A product having a multilayered multilayer structure in which silver paste is printed, laminated and pressed, and integrally fired is configured as a surface mount component.

As the small coil, the above-mentioned surface-mounted component having the printed multilayer structure or the laminated multilayer structure is suitable. However, the method for manufacturing the semi-closed magnetic circuit inductor of the present invention is easy to wind even if it is slightly large, but has a large current capacity and a large number of turns. So the volume is 0,05c
The production method of the present invention is suitable for producing a semi-closed magnetic circuit inductor of c or more. Conversely, in order to manufacture a semi-closed magnetic circuit inductor having a volume of 50 cc or more, an automatic winding machine can be used.
There is no problem because various methods can be adopted freely, but in the manufacture of a semi-closed magnetic circuit inductor having a volume of 50 cc or less, when the wire is hard and difficult to wind or when the number of turns is large, the manufacturing method of the present invention is superior.

[0041]

Embodiments of the present invention will be described below with reference to the drawings.

[0042]

Example 1 A thin ribbon of an amorphous nanocrystalline alloy having a thickness of 0.02 mm and a width of 4.0 mm was wound and had an outer diameter of 20.0 m.
After forming an annular magnetic core having a diameter of mΦ, an inner diameter of 12.0 mmφ, and a thickness of 4.0 mm, coating with a flexible urethane resin and insulating, a part of the annular magnetic core is cut with a dicing saw. 6, a slit 4 having a width of 0.2 mm was formed as shown in the plan view of FIG. 6 to form a half-closed magnetic circuit core.

Then, a round copper wire coated with urethane and having a wire diameter of 0.5 mmΦ was wound in a single layer for 13 turns to form a semi-closed magnetic circuit inductor element shown in FIG. Next, as shown in FIG. 1, a thickness of 0.5 mm made of epoxy resin;
A 5 mm square, length; 4.0 mm square cylinder frame 3 was fitted and fixed with a 0.2 mm thick urethane resin sheet interposed on the cut surface (slit 4) of the semi-closed magnetic circuit core. . Similarly, FIG. 10 shows a state of being fitted and fixed in a U-shaped frame.
Shown in

[0044]

Embodiment 2 The same semi-closed magnetic circuit inductor element as in Embodiment 1 was manufactured by using an inner diameter of 22.0 mmΦ and a depth of 6.5 m shown in FIG.
m having a protrusion 10 of 1.0 mm toward the center on the side wall of the hollow portion 9 having a diameter of 25.0 mm square and a thickness of 8.0 m.
As shown in FIG. 9, a magnetic core was brought into contact with the protruding portion and pressed into the resin case 7 of FIG. Next, the coil terminal of the inductor element was soldered to a terminal electrode (not shown) of the case, an upper lid (not shown) was fitted, and the terminal was bonded and fixed with a resin.

[0045]

Embodiment 3 The same semi-closed magnetic circuit inductor element as in Embodiment 2 is provided with a protrusion 10 having a slope of 1.2 mm at the bottom and 0.5 mm at the top toward the center on the side wall of the hollow portion shown in FIG. Pushed into the case 7 provided with the terminal electrodes having an outer shape of 25.0 mm square and thickness: 8.0 mm, with the urethane resin sheet of thickness: 0, 1 mm interposed as a spacer on the cut surface of the semi-closed magnetic circuit core. Then, the cut surface of the magnetic core was brought into close contact with the urethane resin sheet and fixed. Next, the coil terminal of the inductor element was soldered to a terminal electrode (not shown) of the case, a lid (not shown) was fitted, and the terminal was bonded and fixed with a resin.

[0046]

Fourth Embodiment The same semi-closed magnetic circuit inductor element as in the second embodiment is provided with a screw hole in a side wall of a resin case 7 shown in FIG. It is pushed into the case hollow part 9, the coil terminal of the inductor element is soldered to the terminal electrode of the case, the lid is fitted and fixed with resin, and then the screw 11 is fitted into the screw hole in the case side wall, and the semi-closed magnetic circuit core is inserted. 13 was pressed and fixed in contact with the vicinity of the cut portion to form an adjustable inductor shown in FIG.

[0047]

Fifth Embodiment A semi-closed magnetic circuit inductor element having the same shape as that of the first embodiment formed by laminating ribbons of an amorphous nanocrystalline alloy is formed, and has an inner diameter of 22.0 mm × 24.0 mm shown in FIG.
An outer shape 2 having projections 10 with a 4.2 mm spacing above and below the center of one of the short sides of a hollow part 9 having a depth of 6.5 mm.
It is inserted into a resin case 7 having a terminal electrode (not shown) having a size of 5.0 mm × 27.0 mm and a thickness of 8.0 mm, and is slid. The cut portion of the semi-closed magnetic circuit core is pushed into and pinched by the protrusion. After that, the coil terminal of the inductor element is
After soldering to the terminal electrode (not shown) of the case,
The epoxy resin was cast and dried and cured.

[0048]

Embodiment 6 The same semi-closed magnetic circuit inductor element as in Embodiment 5 is placed in a hollow portion 9 of a case 7 having a screw hole 12 at the bottom shown in FIG. 15, and a coil terminal is connected to a terminal electrode (not shown) of the case. ), The lid was fitted and fixed with a resin, and then the screw was passed through the screw hole so as to be brought into contact with the vicinity of the cut portion of the magnetic core of the half-closed magnetic circuit to be pressed and fixed to form an adjustable inductor.

[0049]

Example 7 A rectangular column-shaped core having a width of 4.5 mm and a thickness of 5.0 mm was wound on a winding machine to obtain a wire diameter of 2.0 mm × 3.0.
A 13 mm turn of a rectangular copper wire coated with urethane coated in a single layer is removed from the winding core to form a rectangular cylindrical air-core coil shown in FIG. 5, and the width of the coil inner diameter of the four surfaces of the coil;
A urethane resin was applied and hardened on one of the coil surfaces of the 4.5 mm surface to bond the wires.

Next, the two cut surfaces of the same semi-closed magnetic circuit core as in the first embodiment are separated from each other on the plane to the inner peripheral side and the outer peripheral side, respectively. With the surface on which the resin is applied and cured and the line is adhered to the inner peripheral side, the coil is bent from the end of the coil to the outer peripheral side where the semi-closed magnetic path magnetic core is separated from the end of the coil while being bent in a ring shape. After inserting into the core and making one round, the two cut surfaces separated from each other
In the same manner as described above, a U-shaped outer frame was fitted and fixed.

[0051]

As described above, according to the method of the present invention, a part of a ring of a closed magnetic circuit annular magnetic core formed by winding or laminating a magnetic alloy ribbon is cut and locally opened magnetic circuit. In the method of forming a semi-closed magnetic path inductor element by forming a semi-closed magnetic path inductor element by winding the semi-closed magnetic path annular magnetic core with the cut surface diverged from the cut surface, or by inserting it into a cylindrical coil formed by winding a conductive wire in advance. By restricting the separated cut surface of the loop annular magnetic core from the outside, the opposing interval and opposing area of the cut surface of the magnetic core of the semi-closed magnetic circuit annular inductor are made uniform to predetermined values, and the saturation current value and the inductance value are obtained. Can be equalized to a predetermined value.

Further, in the semi-closed magnetic circuit annular inductor, the opposing interval or opposing area of the cut surface of the detached semi-closed magnetic path annular magnetic core is adjusted by abutting a screw to adjust the magnetic saturation current. An object of the present invention is to provide the semi-closed magnetic circuit annular inductor capable of adjusting a value and an inductance value to predetermined values from outside the case.

[Brief description of the drawings]

FIG. 1 shows a semi-closed magnetic circuit inductor in which a cut surface of a magnetic core is fixed by a rectangular cylinder frame.

FIG. 2 BH of amorphous nanocrystalline magnetic alloy and ferrite
FIG. 4 shows a comparison diagram of characteristics.

FIG. 3 is a plan view in which a cut surface of a wound semi-closed magnetic circuit core is separated.

FIG. 4 is a perspective view in which a cut surface of a laminated semi-closed magnetic circuit core is separated.

FIG. 5 is a perspective view of a rectangular tubular air-core coil wound with a flat wire.

FIG. 6 shows a semi-closed magnetic circuit core obtained by cutting a ring of a wound closed magnetic circuit core.

FIG. 7 shows a semi-closed magnetic circuit inductor element.

FIG. 8 shows a resin case with a protrusion.

FIG. 9 shows a diagram in which a semi-closed magnetic circuit inductor element is abutted and fixed to a case protrusion.

FIG. 10 shows a semi-closed magnetic circuit inductor in which a cut surface of a magnetic core is fixed by a U-shaped frame.

FIG. 11 shows a case with an inclined and protruding part.

FIG. 12 shows a case with screws that can be adjusted from the side.

FIG. 13 shows a semi-closed magnetic circuit inductor with side adjustable screws.

FIG. 14 shows a resin case having protrusions on the upper and lower sides of a side wall.

FIG. 15 shows a case provided with screws that can be adjusted from the top or bottom.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Semi-closed magnetic circuit core 2 Conductor 3 Fixing frame 4 Slit 5 Cutting surface 6 Rectangular wire 7 Resin case 8 Extension line of ridgeline of magnetic core 9 Hollow part of case 10 Projection of side wall of case 11 Screw 12 Screw hole

Claims (10)

[Claims] 1. A semi-closed magnetic circuit inductor formed by winding a conductive wire around a semi-closed magnetic circuit core obtained by cutting a part of an annular magnetic core,
A semi-closed magnetic circuit core comprising a semi-closed magnetic circuit core obtained by cutting a part of a ring of a closed magnetic circuit annular magnetic core formed by winding or laminating a magnetic alloy ribbon, and a conductor wound around the magnetic core. A semi-closed magnetic circuit inductor, wherein the cut portion is fixed from the outside. 2. The semi-closed magnetic circuit inductor according to claim 1, wherein a cut portion of the semi-closed magnetic core is fixed in a frame. 3. The semi-closed magnetic circuit inductor according to claim 1, wherein a cut portion of the semi-closed magnetic circuit core is fixed by a projection inside the case. 4. The semi-closed magnetic circuit inductor according to claim 3, wherein the cut portion of the semi-closed magnetic circuit core is fixed by abutting the outer periphery of the annular magnetic core on a plurality of inclined side wall protrusions inside the case,
A semi-closed magnetic circuit inductor, wherein both cut surfaces are pressed against each other via a spacer. 5. The semi-closed magnetic circuit inductor according to claim 4, wherein a screw penetrating a side wall of the rectangular case, which is formed by cutting a corner of the rectangular case in plan view, abuts and is fixed near a cut portion of the semi-closed magnetic circuit core. A semi-closed magnetic circuit inductor. 6. The semi-closed magnetic path inductor according to claim 3, wherein a cut portion of the semi-closed magnetic path core is formed between a protrusion provided on a bottom surface inside the case and a protrusion provided on an upper surface inside the case. A semi-closed magnetic circuit inductor which is sandwiched and fixed. 7. The semi-closed magnetic circuit inductor according to claim 3, wherein a screw penetrating through the top or bottom surface of the case abuts and is fixed near a cut portion of the semi-closed magnetic circuit core. Road inductor. 8. The semi-closed magnetic circuit inductor according to claim 1, wherein a cylindrical coil formed by winding a conductive wire is formed in advance, and a magnetic alloy ribbon is wound or laminated. A part of the ring of the closed magnetic circuit annular magnetic core is cut and inserted into the cylindrical coil from the separated cut surface to form a semi-closed magnetic circuit inductor, and the cut portion of the semi-closed magnetic circuit core is externally fixed. A method for manufacturing a semi-closed magnetic circuit inductor, comprising: 9. The semi-closed magnetic circuit inductor according to claim 1, wherein an amorphous nanocrystalline magnetic alloy having a thickness range of 5 μm to 25 μm is used for the magnetic alloy ribbon. Semi-closed magnetic circuit inductor. 10. The semi-closed magnetic circuit inductor according to claim 1, wherein the volume is 0.05 cc to 50 c.
(c) a semi-closed magnetic circuit inductor.