JP2002289443A - Inductor component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inductor component wherein a current to be handled is large, magnetic characteristics are hardly degraded and anti magnetic measures or miniaturizing/lightening can be easily attained. SOLUTION: This inductor component is provided with a drum type magnetic core 11 composed of a magnetic substance of a structure integrally having flanges of different sizes on both ends of a columnar body, a winding 12 wound around the columnar body of the core 11 and arranged while being held between the respective flanges, a sleeve core abutted to the peripheral edge of a larger flange in the core 11 around which the winding 12 is wound and arranged around a smaller flange and the winding 12, and a permanent magnet 13 which is a void inside a closed magnetic path formed of the core 11 and the sleeve core arranged around the smaller flange for impressing a DC magnetic field HM oppositely to the direction of a magnetic field HS to be generated by a magnetomotive force using the winding 12. A magnetic bias to be impressed by the magnet 13 in this case expands a usable magnetic flux density width.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inductor component mainly applied to a step-up / step-down choke coil for an inverter / switching power supply, a transformer, a power transformer, and the like.

[0002]

2. Description of the Related Art Conventionally, as an example of this kind of inductor component, there is one having a structure as shown in FIGS. 9 (a) and 9 (b). However, FIG. 9A is a side sectional view of the inductor component, and FIG. 9B is a partially transparent perspective view of the appearance.

This inductor component comprises a drum-shaped magnetic core 71 made of a magnetic material having a structure in which disk-shaped flanges 76 and 77 are integrally provided at both ends of a columnar body, and wound around the columnar body of the drum-shaped magnetic core 71. Turned each flange 76,
A winding 72 disposed between the windings 77, a cylindrical insulator 74 provided around a drum-shaped magnetic core 71 around which the winding 72 is wound, and provided around the insulator 74. And a cylindrical sleeve core 78.
A terminal 88 connected to a lead wire at the end of the winding 72 is provided at a predetermined location near the bottom of the wire.

That is, in the case of this inductor component, after a cylindrical sleeve core 78 is attached to the outside of the drum-shaped magnetic core 71, a cylindrical insulator 74 is attached to the joint between the drum-shaped magnetic core 71 and the cylindrical sleeve core 78. by inserting the, a configuration which gave a gap, the magnetic field H _s generated by a magnetomotive force due to the winding (coil) 73 toward the flange 77 to the flange 76 side is featuring the acting.

In the case of such a configuration, with the recent trend toward downsizing and weight reduction of electronic equipment, there is a demand for downsizing of inductors and transformers used in a power supply unit. The problem that the magnetic flux 71 can easily be magnetically saturated and the current that can be handled is reduced can be solved by widening the air gap formed by the insulator 74. However, the inductance value is reduced, and the number of turns 72 is reduced. This is an obstacle in realizing miniaturization.

Therefore, as another example of an inductor component which has solved such a problem, a component having a configuration as shown in FIGS. 10 (a) and 10 (b) has been developed. However, FIG.
10A is a side sectional view of the inductor component, and FIG.
(B) is a partially transparent perspective view of the appearance.

This inductor component has a drum-shaped magnetic core 81 made of a magnetic material having a structure in which disk-shaped flanges 86 and 87 are integrally provided at both ends of a columnar body, and is wound around the columnar body of the drum-shaped magnetic core 81. Turned each flange 86,
A permanent magnet 83 provided around a drum-shaped magnetic core 81 around which the winding 82 is wound, and provided near a bottom of the permanent magnet 83. Terminal 8 connected to a lead wire at the end of winding 82 at a predetermined location
8 are arranged and configured.

That is, in the case of this inductor component, a cylindrical permanent magnet 83 is disposed outside the drum-shaped magnetic core 81 in place of the sleeve core on the S pole side on the flange 87 side.
And N-pole side is mounted so as to be disposed on the flange 86 side, the magnetic field by the permanent magnet 83 so as to block the magnetic field H _s generated by a magnetomotive force due to the winding (coil) 82 that acts toward the flange 87 to the flange 86 side It is characterized in that H _M acts and the current that can be handled can be increased by applying a magnetic bias.

Incidentally, in this magnetic bias applying type inductor component, the drum type magnetic core 81 is made of Ni-Zn.
The ferrite powder is formed by compacting by a pressing method using a ferrite powder of a shape and then sintering, or by pressing the ferrite powder into a cylindrical shape and sintering to form a flange portion by machining. The permanent magnet 83 for applying a magnetic bias is formed by sintering a powder of Sr ferrite, Ba ferrite or the like after pressing by a pressing method. Core 81
At the time of attachment to the device, they are integrally joined using an adhesive or the like.

[0010]

The above-mentioned magnetic bias applying type inductor component has disadvantages in the following points.

First, since a structure having an open magnetic path without using a sleeve core is employed, there is a problem that the leakage magnetic flux is increased and easily affects the surroundings, and sufficient measures against magnetic shielding cannot be taken.

Second, since a structure in which an open magnetic path is formed without using a sleeve core is employed, the effective magnetic permeability is reduced and the inductance is reduced. Therefore, a considerable amount of inductance is required until a required inductance value is obtained. This requires the number of turns of the winding (winding up the coil), which is a problem that the size is hindered.

Third, in the case of a permanent magnet using ferrite powder, there is a problem that thermal demagnetization due to heating in the reflow soldering process or demagnetization due to an excessive current are apt to occur, and the magnetic properties of the permanent magnet are easily deteriorated. .

Fourth, in the case of a permanent magnet made of a metal-based material, the eddy current loss increases due to low specific resistance, and oxidation proceeds with time, causing permanent demagnetization. There is a critical problem in reliability that initial characteristics cannot be maintained.

The present invention has been made to solve such problems, and the technical problem is that the current that can be handled is large and the magnetic characteristics are not easily impaired. It is an object of the present invention to provide an inductor component which can be achieved in a wide range.

[0016]

According to the present invention, a drum-shaped magnetic core made of a magnetic material having a structure in which flanges are integrally provided at both ends of a columnar body, and a drum-shaped magnetic core wound around the columnar body. In an inductor component including a winding disposed between flanges and a permanent magnet disposed near the drum-shaped magnetic core around which the winding is wound, the inductor component is mounted outside the drum-shaped magnetic core. With a sleeve core,
The permanent magnet is arranged so as to apply a DC magnetic field in a direction opposite to the direction of the magnetic field generated by the magnetomotive force of the winding to at least one gap in a closed magnetic path formed by the drum-type magnetic core and the sleeve core. The obtained inductor component is obtained.

According to the invention, in the inductor component, the permanent magnet is made of a polyamideimide resin, a polyimide resin, an epoxy resin, a polyphenylene sulfide resin, a silicon resin, a polyester resin, an aromatic polyamide resin, and a liquid crystal polymer. The intrinsic coercive force _Hc is at least 7.9 × for at least one resin selected from among them.
10 ⁵ (A / m) or more, a Curie temperature _Tc of 500 ° C. or more, and a powder having a mean particle size of 2.5 to 25 μm.
a, In, Mg, Pb, Sb, and Sn are coated with at least one metal or alloy, the content of the resin is 30% or more by volume, and the specific resistance is 0.1 Ωcm.
The above-described inductor component is obtained.

Further, according to the present invention, in the inductor component, the rare earth magnet powder has a composition Sm (Co _bal. F) _.
e _0.15-0.25 Cu _0.05-0.06 Zr _0.02-0.03 ) _7.0-8.5
Is obtained.

In addition, according to the present invention, in any of the above inductor components, the rare earth magnet powder has a softening point of 2 or less.
Inductor parts coated with an inorganic glass having a temperature of 20 ° C. or more and 550 ° C. or less, or a metal or alloy coated with a rare earth magnet powder, an inductor part coated with a nonmetallic inorganic compound having a melting point of at least 300 ° C. or more can get. In these inductor components, the amount of addition of the inorganic glass or the non-metallic inorganic compound is 0.1% to 1% by volume.
Preferably it is in the range of 0%.

On the other hand, according to the present invention, in any one of the above inductor components, the permanent magnet is obtained by orienting the rare earth magnet powder in the thickness direction with a magnetic field and magnetically anisotropic. .

On the other hand, according to the present invention, in any one of the above inductor components, the permanent magnet has a magnetizing magnetic field of 2.
Inductor components of 5T or more are obtained.

According to the invention, in any one of the above inductor components, the permanent magnet has a center line average roughness R
An inductor component having a of 10 μm or less is obtained.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The following is a detailed description of an inductor component according to the present invention with reference to the drawings.

First, the technical outline of the inductor component of the present invention will be briefly described. The inductor component includes a drum-shaped magnetic core made of a magnetic material having a structure in which flanges are integrally formed at both ends of a columnar body, and a winding wound around the columnar body of the drum-shaped magnetic core and disposed between the flanges. In a basic configuration including a wire and a permanent magnet provided in the vicinity of a drum-shaped magnetic core around which a winding is wound, the permanent magnet includes a sleeve core mounted outside the drum-shaped magnetic core. A DC magnetic field is applied to at least one or more gaps in a closed magnetic path formed by the drum-type magnetic core and the sleeve core in a direction opposite to the direction of the magnetic field generated by the magnetomotive force of the winding (coil) (the direction of the magnetic flux). It is arranged and arranged so that

FIG. 1 shows the magnetic bias effect of the inductor component of the present invention. FIG. 1A shows a magnetic flux density B-magnetic field H characteristic including a magnetic flux density width .DELTA.B before applying a magnetic bias. FIG. 4B shows the magnetic flux density B− including the magnetic flux density width ΔB ′ after the application of the magnetic bias.
FIG. 4C relates to a magnetic field H characteristic, and FIG. 6C relates to a DC superimposed inductance characteristic (change thereof) due to a magnetic bias, which is represented by a relation of an inductance to an output current.

In the case of the inductor component of the present invention, before the magnetic bias is applied, the magnetic flux density width ΔB normally used in the region of the first quadrant as shown in FIG. As shown in b), the drum-type magnetic core is biased in the third quadrant on the magnetic flux density B-magnetic field H characteristic curve by the bias effect of the permanent magnet, thereby greatly expanding the magnetic flux density width ΔB ′ that can be used. be able to.

Generally, since the magnetic flux density widths ΔB and ΔB ′ are inversely proportional to the number of turns of the windings in the inductor component, the number of turns can be reduced by enlarging the magnetic flux density width ΔB ′. It greatly contributes to miniaturization and weight reduction. Also, the processing power Po when such an inductor component is applied to a transformer or a step-up / step-down coil.
Is given by Po = Po, where κ is the proportional constant and f is the drive frequency.
κ · (ΔB ′) ² · f. Therefore, the processing power Po greatly increases in proportion to the square of ΔB ′. Further, the enlargement of ΔB ′ is shown in FIG.
(C) shows that the current value (output current) handled in the DC superimposed inductance characteristic can be greatly increased as indicated by the amount of transition from the dotted line to the solid line with the arrow.

Further, in the case of the inductor component of the present invention, instead of the conventional structure in which an open magnetic path is formed without using a sleeve core, a permanent gap is formed in a gap in a closed magnetic path formed by a drum type magnetic core and a sleeve core. With the configuration in which the magnet is inserted, the leakage magnetic flux at the time of configuring the open magnetic circuit is greatly reduced, and sufficient anti-magnetic measures can be taken.

By the way, in the inductor component of the present invention,
The permanent magnet is made of polyamide-imide resin or polyimide resin.
Fat, epoxy resin, polyphenylene sulfide resin,
Silicon resin, polyester resin, aromatic polyamide
At least one selected from resin and liquid crystal polymer
Specific coercive force H for one type of resin_cIs 7.9 × 10 ^Five
(A / m) or more, Curie temperature T_c Is 500 ° C or more, powder
Disperse rare earth magnet powder with powder average particle size of 2.5 to 25 μm
And the surface is made of Zn, Al, Bi, Ga, I
at least one of n, Mg, Pb, Sb, and Sn
Of metal or alloy, and the resin content is volume
30% or more, and the specific resistance is 0.1 Ωcm or more.
Shall be. However, the rare earth magnet used for this permanent magnet
The stone powder has a composition of SmCo type, and specifically, the composition Sm
(Co_bal.Fe_0.15-0.25 Cu_{0.05 -0.06} Zr
_0.02-0.03 )_7.0-8.5 And the maximum particle size is 50 μm
It is preferable to set the following.

Thus, the Curie temperature T _c is applied to the permanent magnet.
And by using the intrinsic coercive force H _c and a high SmCo-based magnet powder, it is placed in a heated state in the reflow soldering process, without causing thermal demagnetization, yet be direct current magnetic field due to an excessive current is applied, the coercive without force H _c is demagnetized disappears, it is possible to maintain the initial characteristics. Also, SmC
By kneading the o-based magnet powder with the resin at a volume ratio of 30% or more, it is possible to increase the specific resistance, and it is possible to greatly reduce the eddy current loss of the permanent magnet.

Further, in the inductor component of the present invention,
550 ° C at softening point of 220 ° C or higher for SmCo-based magnet powder
If coated with the following inorganic glass, or if the metal or alloy coated on the SmCo-based magnetic powder is coated with a nonmetallic inorganic compound having a melting point of at least 300 ° C. or more, oxidation over time progresses and demagnetization occurs. Can be prevented. The amount of the inorganic glass or nonmetallic inorganic compound added is preferably in the range of 0.1% to 10% by volume.

In addition, as an embodiment, the SmCo-based magnet powder in the permanent magnet is made to be magnetically anisotropic by being oriented in the thickness direction by a magnetic field, and has a magnetization magnetic field of 2.5T.
As described above, if a permanent magnet having a center line average roughness Ra of 10 μm or less is manufactured, it can be effectively applied as inductor components in various fields.

Therefore, the detailed configuration of the inductor component of the present invention will be specifically described below based on several embodiments.

(Embodiment 1) FIGS. 2A and 2B show a basic configuration of an inductor component according to Embodiment 1 of the present invention. FIG. 2A shows a side sectional view, and FIG. FIG. 4C relates to an external perspective view of another form partially transparent, and FIG. 5C relates to a perspective view of another form partially transparent.

First, referring to the basic configuration of FIG. 2A, the inductor component according to the first embodiment is a drum type made of a magnetic material having a structure in which flanges having different sizes are integrally provided at both ends of a columnar body. A magnetic core 11, a winding 12 wound around a columnar body of the drum-shaped magnetic core 11, and disposed between the flanges, and a larger one of the drum-shaped magnetic core 11 around which the winding 12 is wound. A sleeve core provided in contact with the periphery of the smaller flange and the winding 12 in contact with the peripheral edge of the flange, and a gap in a closed magnetic circuit formed by the drum-shaped magnetic core 11 and the sleeve core;
The direction of the magnetic field H _S generated by the magnetomotive force generated by the windings 12 (that is, inserted in the gap between the smaller flange of the drum-shaped magnetic core 11 and the sleeve core) around the smaller flange (the direction of the magnetic flux) DC magnetic field H in the opposite direction to
A permanent magnet 13 for applying _M is provided, and a terminal 88 connected to a lead wire at the end of the winding 12 is provided at a predetermined location near the bottom of the larger flange.

Referring to FIG. 2 (b), one form of inductor component will be described. The basic configuration of FIG. 2 (a) is a configuration in which the whole is formed in a columnar shape. Thereby, the columnar body in the drum type magnetic core 11 is a columnar body,
The larger flange is the disc-shaped lower flange 17,
The smaller flange is a disc-shaped upper flange 16. The permanent magnet 13 is cylindrical, and the sleeve core is a cylindrical sleeve core 18.

Referring to FIG. 2 (c), another form of inductor component will be described. The basic configuration of FIG. 2 (a) is a configuration in which the whole is formed in a square pole shape. This allows
The columnar body in the drum type magnetic core 11 is a square columnar body, the larger flange is a square plate-shaped lower flange 20, and the smaller flange is a square plate-shaped upper flange 19.
It is shown that. Further, the permanent magnet 13 has a square tubular shape, and the sleeve core is a square tubular sleeve core 21.

In any form of inductor component,
The drum-shaped magnetic core 11 is manufactured by pressing a Ni—Zn ferrite powder into a columnar shape or a square column shape, calcining, cutting, and then forming a drum shape, and performing main sintering. After pressing and sintering in advance into a columnar or square column,
Although cutting may be performed, in this case, there is a disadvantage that the cost increases even if the dimensional accuracy increases. In addition, the cylindrical sleeve core 18 and the square tubular sleeve core 21 are manufactured by using a Ni-Zn ferrite powder and pressing and sintering into a cylindrical or square tubular shape.

[0039] Further, the permanent magnet 13, in the case of an embodiment shown in FIG. 2 (b), the composition Sm (Co _{0. 742} Fe _0.20 Cu
_0.055 Zr _0.029 ) _7.7 , average particle size is 5 μm, maximum particle size is 45 μm, and intrinsic coercive force H _c is 15.8 × 10 ⁵
(A / m), a rare earth magnet powder having a Curie temperature T _c of 770 ° C. was used. The surface of the rare earth magnet powder is coated with Zn, and a polyamideimide resin is used as a binder in a volume ratio of 40.
% And kneaded and formed to have a specific resistance of 0.5 Ωcm or more.

The configuration of the drum type magnetic core 11 and the cylindrical sleeve core 18 used here has a magnetic path length of 1.85 c.
m, effective area is 0.07 cm ² , gap is 150μ
m. The winding 12 is wound 15 turns, the DC resistance is 20 mΩ, and the thickness of the permanent magnet 13 is 120 μm.

As a comparative example, an inductor having a magnetic path length of 1.85 cm, an effective sectional area of 0.07 cm ² , and a thickness of the insulator 74 of 75 μm is shown in FIGS. 9A and 9B. The components and the configuration shown in FIGS. 10A and 10B have a magnetic path length of 1.85 cm, an effective area of 0.07 cm ² , and a thickness of 1 m using Ba ferrite as the permanent magnet 83.
m inductor components were prototyped.

[0042] Figure 3 is a DC superposition inductance characteristics shown in relation to the inductance value L [.mu.H] for _c [A] current value Id in the inductor component of the comparative example as a form inductor component of the first embodiment described above Are shown in comparison.

FIG. 3 shows that the first embodiment is represented by a curve C1.
9 (a) and 9 (b) shown by a curve C2 and the conventional inductor parts shown by a curve C3 in FIGS. 10 (a) and 10 (b). Compared with the inductor component, the DC superimposed inductance characteristic is improved by 50% with respect to the curve C2 not using the magnetic bias, and the initial inductance value is reduced due to the decrease in the effective magnetic permeability as shown by the curve C3 using the magnetic bias. It turns out that it cannot be seen.

These results are the same as in the case where each inductor component is applied to a transformer. The results show that the processing power Po can be greatly increased not only by improving the DC superimposed inductance characteristic but also by increasing the magnetic flux density width ΔB ′. ing. In addition, the number of turns of the winding 12 can be reduced along with the increase in the magnetic flux density width ΔB ′, and a reduction in loss and a reduction in size can be achieved.

In the first embodiment, the inductor component of one embodiment shown in FIG. 2B has been mainly described.
Substantially equivalent results are obtained for the inductor component of another form shown in FIG.

(Embodiment 2) FIGS. 4A and 4B show a basic configuration of an inductor component according to Embodiment 2 of the present invention. FIG. 4A is related to a side sectional view, and FIG. FIG. 4C relates to an external perspective view of another form partially transparent, and FIG. 5C relates to a perspective view of another form partially transparent.

First, referring to the basic configuration of FIG. 4A, the inductor component according to the second embodiment is a drum type made of a magnetic material having a structure in which flanges having different sizes are integrally provided at both ends of a columnar body. A magnetic core 21, a winding 22 wound around a columnar body of the drum-shaped magnetic core 21 and disposed between the flanges, and a larger one of the drum-shaped magnetic core 21 around which the winding 22 is wound. A ring-shaped permanent magnet 23 interposed on the periphery of the flange, and a smaller flange and a sleeve core provided around the winding 22.
And a gap in the closed magnetic path formed by the sleeve core, which is provided at the periphery of the larger flange (that is, inserted into the gap between the periphery of the larger flange of the drum-type magnetic core 21 and the sleeve core). magnetic field generated by the magnetomotive force by winding 22 Te H _S direction is arranged to apply a DC magnetic field H _M and in the opposite orientation (the direction of the magnetic flux), winding at a predetermined position near the bottom of the larger flange A terminal 88 connected to a lead wire at the 22 end is provided.

Referring to FIG. 4B, an embodiment of an inductor component will be described in which the basic configuration of FIG. 4A is entirely formed in a columnar shape. Thereby, the columnar body in the drum type magnetic core 22 is a columnar body,
The larger flange is a disc-shaped lower flange 27,
The smaller flange indicates a disc-shaped upper flange 26. The permanent magnet 23 has a ring shape, and the sleeve core is a cylindrical sleeve core 28.

Referring to FIG. 4 (c), another form of inductor component will be described. The basic configuration of FIG. 4 (a) is a configuration in which the whole is formed in a square pole shape. This allows
The columnar body of the drum type magnetic core 21 is a square columnar body, the larger flange is a square plate-shaped lower flange 30, and the smaller flange is a square plate-shaped upper flange 29.
It is shown that. Further, the permanent magnet 23 has a square frame plate shape, and the sleeve core is a square tubular sleeve core 31.

In any form of inductor component,
The drum-shaped magnetic core 21 is manufactured by pressing a Ni—Zn-based ferrite powder into a column shape or a square column shape, calcining, cutting, and then forming a drum shape, and performing main sintering. After pressing and sintering in advance into a columnar or square column,
Although cutting may be performed, in this case, there is a disadvantage that the cost is increased even if the dimensional accuracy is increased. Further, the cylindrical sleeve core 28 and the square tubular sleeve core 31 are manufactured by using a Ni-Zn ferrite powder and pressing and sintering into a cylindrical or square tubular shape.

[0051] Further, the permanent magnet 23 in the case of an embodiment shown in FIG. 4 (b), the composition Sm (Co _{0. 742} Fe _0.20 Cu
_0.055 Zr _0.029 ) _7.7 , average particle size is 5 μm, maximum particle size is 45 μm, and intrinsic coercive force H _c is 15.8 × 10 ⁵
(A / m) Above, a rare earth magnet powder having a Curie temperature _Tc of 770 ° C. was used. The surface of the rare earth magnet powder was coated with Zn, and a polyamideimide resin was kneaded and formed at a volume ratio of 40% as a binder to produce a specific resistance of 0.5 Ωcm or more.

The configuration of the drum type magnetic core 21 and the cylindrical sleeve core 28 used here has a magnetic path length of 1.85 c.
m, effective area is 0.07 cm ² , gap is 150μ
m. The winding 22 is wound 15 turns, the DC resistance is 20 mΩ, and the thickness of the permanent magnet 23 is 120 μm.

As a comparative example, an inductor component having the configuration and specifications shown in FIGS. 9A and 9B as in the case of the first embodiment, and FIGS. 10A and 10B And an inductor component having the configuration and specifications shown in FIG.

Therefore, the DC superimposed inductance characteristics of these inductor components were also measured.
The result was almost the same as the case shown in FIG. Therefore,
Also in the case of the inductor component according to one embodiment of the second embodiment, the DC bias inductance characteristics are improved by almost 50% compared to the inductor component not using the magnetic bias, and the magnetic bias is used. No decrease in the initial inductance value due to a decrease in the effective magnetic permeability is observed.

These results are the same as in the case where each inductor component is applied to a transformer. The results show that the processing power Po can be greatly increased not only by improving the DC superimposed inductance characteristic but also by increasing the magnetic flux density width ΔB ′. ing. In addition, the number of turns of the winding is 2 with the increase of the magnetic flux density width ΔB ′.
2 can be reduced, and a reduction in loss and a reduction in size can be achieved.

In the second embodiment, the inductor component of one embodiment shown in FIG. 4B has been mainly described.
Substantially equivalent results are obtained for the inductor component of another form shown in FIG.

(Embodiment 3) FIGS. 5A and 5B show a basic configuration of an inductor component according to Embodiment 3 of the present invention. FIG. 5A is related to a side sectional view, and FIG. FIG. 4C relates to an external perspective view of another form partially transparent, and FIG. 5C relates to a perspective view of another form partially transparent.

First, referring to the basic configuration of FIG. 5A, the inductor component according to the third embodiment is a drum type made of a magnetic material having a structure in which flanges having different sizes are integrally provided at both ends of a columnar body. A magnetic core 31; a winding 32 wound around a columnar body of the drum-shaped magnetic core 31 and disposed between the flanges; and a larger one of the drum-shaped magnetic core 31 around which the winding 32 is wound. A ring-shaped permanent magnet 33b is interposed on the peripheral edge of the flange and a sleeve core disposed around the smaller flange and the winding 32, and a drum-shaped magnetic core 31 and a sleeve core are formed. An air gap in the closed magnetic circuit, which is provided around the smaller flange (that is, inserted into the gap between the smaller flange of the drum-type magnetic core 31 and the sleeve core).
Permanent magnets 33a for applying a magnetic field H DC in _S direction opposite to the direction of orientation magnetic field H _M generated by the magnetomotive force due to the winding 32 being
The permanent magnet 33b is provided on the periphery of the larger flange (that is, inserted into the gap between the periphery of the larger flange of the drum type magnetic core 31 and the sleeve core), magnetic field H _S is arranged to apply a DC magnetic field H _M in the direction opposite to the direction of orientation of the terminals 88 connected to the lead wire of the winding 32 ends at a predetermined position near the bottom of the larger flange occurs It is deployed and configured.

Referring to FIG. 5B, one form of the inductor component will be described. The basic configuration of FIG. 5A is a configuration in which the whole is formed in a columnar shape. Thereby, the columnar body in the drum type magnetic core 31 is a columnar body,
The larger flange is a disc-shaped lower flange 37,
The smaller flange is a disc-shaped upper flange 36. The permanent magnet 33a is cylindrical,
b indicates a ring shape, and indicates that the sleeve core is a cylindrical sleeve core 38.

Referring to FIG. 5 (c), another form of inductor component will be described. The basic configuration of FIG. 5 (a) is a configuration in which the whole is formed in a square pole shape. This allows
The columnar body of the drum type magnetic core 31 is a square columnar body, the larger flange is a square plate-shaped lower flange 40, and the smaller flange is a square plate-shaped upper flange 39.
It is shown that. Further, the permanent magnet 33a has a square tubular shape, the permanent magnet 33b has a square frame plate shape, and the sleeve core is a square tubular sleeve core 41.

In any form of inductor component,
The drum-shaped magnetic core 31 is manufactured by pressing a Ni-Zn ferrite powder into a columnar shape or a square column shape, calcining, cutting, and then forming a drum-shaped shape, and then performing main sintering. After pressing and sintering in advance into a columnar or square column,
Although cutting may be performed, in this case, there is a disadvantage that the cost is increased even if the dimensional accuracy is increased. Further, the cylindrical sleeve core 38 and the square tubular sleeve core 41 are manufactured by using a Ni-Zn ferrite powder and pressing and sintering into a cylindrical or square tubular shape.

Further, the permanent magnets 33a and 33b have
In the case of the embodiment shown in FIG. 2B, the composition is Sm (Co _0.742 F
e _0.20 Cu _0.055 Zr _0.029 ) _7.7 , average particle size 5 μm
The maximum particle size is 45 μm and the intrinsic coercive force H _c is 15.
8 × 10 ⁵ (A / m) or more, Curie temperature _Tc is 770
C. rare earth magnet powder was used. The surface of the rare earth magnet powder is coated with Zn, and a polyamideimide resin is kneaded and molded at a volume ratio of 40% as a binder, and the specific resistance is 0.5 Ωcm.
It was produced so as to be as described above.

The configuration of the drum type magnetic core 31 and the cylindrical sleeve core 38 used here has a magnetic path length of 1.85 c.
m, effective area is 0.07 cm ² , gap is 80 μm
Can be exemplified. The winding 32 is wound 15 turns, the DC resistance is 20 mΩ, and the permanent magnets 33a,
33b can be exemplified by using a thickness of 70 μm.

Here, as a comparative example, FIG.
In the configuration shown in FIG. 10B, an inductor component having a magnetic path length of 1.85 cm, an effective area of 0.07 cm ² , and a thickness of the insulator 74 of 80 μm is shown in FIGS. 10A and 10B. With the configuration, the magnetic path length is 1.85 cm and the effective area is 0.07 cm
^2. An inductor part having a thickness of 1 mm was manufactured by trial using Ba ferrite as the permanent magnet 83.

FIG. 6 shows an inductor component according to an embodiment of the third embodiment and FIGS. 9 (a) and 9 (b) and FIGS. 10 (a) and 10 (a).
Inductance value with respect to the current value Id _c [A] in the inductor component comprising a conventional comparative example shown in (b) L
It is a comparison result of the measurement of the DC superimposed inductance characteristic shown in relation to [μH].

FIG. 6 shows that the third embodiment shown by the curve C4
9 (a) and 9 (b) shown by a curve C5 and the conventional inductor parts shown by a curve C6 in FIGS. 10 (a) and 10 (b). Compared with the inductor component, the DC superimposed inductance characteristic is improved by 50% with respect to the curve C5 not using the magnetic bias, and the initial inductance value is reduced due to the decrease in the effective magnetic permeability as shown by the curve C6 using the magnetic bias. It turns out that it cannot be seen.

These results are the same as in the case where each inductor component is applied to a transformer. The results show that the processing power Po can be greatly increased not only by improving the DC superimposed inductance characteristic but also by increasing the magnetic flux density width ΔB ′. ing. In addition, the number of windings of the winding 32 can be reduced along with the increase of the magnetic flux density width ΔB ′, and a reduction in loss and a reduction in size can be achieved.

In the third embodiment, the inductor component of one form shown in FIG. 5B has been mainly described.
Substantially equivalent results are obtained for the inductor component of another form shown in FIG.

(Embodiment 4) FIGS. 7A and 7B show a basic configuration of an inductor component according to Embodiment 4 of the present invention. FIG. 7A is a side sectional view, and FIG. FIG. 4C relates to an external perspective view of another form partially transparent, and FIG. 5C relates to a perspective view of another form partially transparent.

First, referring to the basic configuration of FIG. 7A, the inductor component according to the fourth embodiment is a drum made of a magnetic material having a structure in which flanges having slightly different sizes are integrally provided at both ends of a columnar body. Type magnetic core 41, a winding 42 wound around a columnar body of the drum type magnetic core 41 and disposed between the flanges, and a large size of the drum type magnetic core 41 around which the winding 42 is wound. A sleeve core provided so as to cover the periphery of each of the flanges and the windings 42 that are in contact with the side surfaces of the other flange, and a gap in a closed magnetic path formed by the drum-type magnetic core 41 and the sleeve core. , deployed around the smaller flange (i.e., gap insertion deploy the smaller flange and the sleeve core a drum type magnetic core 41) direction of the magnetic field H _S that is generated by the magnetomotive force by winding 42 And the reverse direction and a permanent magnet 43 for applying a DC magnetic field H _M, the terminal 88 is configured to be deployed to be connected to the lead wire of the winding 42 ends at a predetermined position near the bottom of the sleeve core I have.

Referring to FIG. 7 (b), one form of inductor component will be described. The basic configuration of FIG. 7 (a) is a configuration in which the whole is formed in a columnar shape. Thereby, the columnar body in the drum type magnetic core 41 is a columnar body,
The larger flange is a disc-shaped lower flange 47,
The smaller flange is a disc-shaped upper flange 46. The permanent magnet 43 has a cylindrical shape, and the sleeve core is a cylindrical sleeve core 48.

Referring to FIG. 7 (c), another form of inductor component will be described. The basic configuration shown in FIG. 7 (a) is configured so that the whole is formed in a quadrangular prism shape. This allows
The columnar body in the drum type magnetic core 41 is a square columnar body, the larger flange is a square plate-shaped lower flange 50, and the smaller flange is a square plate-shaped upper flange 49.
It is shown that. Further, the permanent magnet 43 has a square tubular shape, and the sleeve core is a square tubular sleeve core 51.

In any form of inductor component,
The drum-type magnetic core 41 is manufactured by pressing a Ni-Zn ferrite powder into a columnar shape or a quadratic prism shape, calcining, cutting, and then forming a drum shape, and performing main sintering. After pressing and sintering in advance into a columnar or square column,
Although cutting may be performed, in this case, there is a disadvantage that the cost is increased even if the dimensional accuracy is increased. The cylindrical sleeve core 48 and the square tubular sleeve core 51 are manufactured by pressing into a cylindrical or square tubular shape using Ni-Zn ferrite powder and sintering.

Further, as shown in FIG.
In the case of one form, the composition is Sm (Co _0.742 Fe_0.20Cu
_0.055 Zr_0.029 )_7.7 Having an average particle size of 5 μm,
Large particle size 45μm, intrinsic coercive force H_cIs 15.8 × 10^Five
(A / m) or more, Curie temperature T_cIs 770 ℃ rare earth
Magnet powder was used. Zn on the surface of this rare earth magnet powder
Coated, polyamide imide resin in volume ratio as binder
Kneading molding at 40%, the specific resistance becomes 0.5Ωcm or more
It was produced as follows.

The configuration of the drum type magnetic core 41 and the cylindrical sleeve core 48 used here has a magnetic path length of 1.85 c.
m, effective area is 0.07 cm ² , gap is 150μ
m. The winding 42 is wound 15 turns, the DC resistance is 20 mΩ, and the thickness of the permanent magnet 43 is 120 μm.

Here, as a comparative example, FIG.
In the configuration shown in FIG. 10B, an inductor component having a magnetic path length of 1.85 cm, an effective sectional area of 0.07 cm ² , and a thickness of the insulator 74 of 75 μm is shown in FIGS. With the configuration, the magnetic path length is 1.85 cm and the effective area is 0.07 cm
^2. An inductor part having a thickness of 1 mm was manufactured by trial using Ba ferrite as the permanent magnet 83.

Then, the DC superimposed inductance characteristics of these inductor components were also measured.
The result was almost the same as the case shown in FIG. Therefore,
Also in the case of the inductor component according to one embodiment of the fourth embodiment, compared with the inductor component of the conventional comparative example, the DC superimposed inductance characteristic is improved by approximately 50% compared with the inductor component not using the magnetic bias, and the magnetic bias is used. No decrease in the initial inductance value due to a decrease in the effective magnetic permeability is observed.

These results are the same when the respective inductor components are applied to the transformer, and show that the processing power Po can be greatly increased not only by improving the DC superimposed inductance characteristic but also by increasing the magnetic flux density width ΔB ′. ing. In addition, the number of windings of the winding 42 can be reduced along with the expansion of the magnetic flux density width ΔB ′, and a reduction in loss and a reduction in size can be achieved.

In the fourth embodiment, the inductor component of one embodiment shown in FIG. 7B has been mainly described.
Substantially equivalent results are obtained for the inductor component of another form shown in FIG.

(Embodiment 5) FIGS. 8A and 8B show the basic structure of an inductor component according to Embodiment 5 of the present invention. FIG. 8A is related to a side sectional view, and FIG. FIG. 4C relates to an external perspective view of another form partially transparent, and FIG. 5C relates to a perspective view of another form partially transparent.

First, referring to the basic configuration of FIG. 8A, the inductor component according to the fifth embodiment is a drum type made of a magnetic material having a structure in which flanges having the same size are integrally formed at both ends of a columnar body. The magnetic core 51, a winding 52 wound around a columnar body of the drum-type magnetic core 51 and disposed between the flanges, and both of the drum-type magnetic core 51 around which the winding 52 is wound. A sleeve core provided in the vicinity of the side surface of the flange so as to cover the periphery of each flange and the winding 52; and a gap in a closed magnetic path formed by the drum-type magnetic core 51 and the sleeve core. deployment (i.e., both of the flange and inserted deployed to each of the gap between the sleeve core drum type magnetic core 51) in to the magnetic field H _S generated by a magnetomotive force due to the winding 52 orientation opposite orientation to Permanent magnets for applying a flow field H _M 5
3a and 53b, and a terminal 88 connected to a lead wire at the end of the winding 52 is provided at a predetermined location near the bottom of the sleeve core.

Referring to FIG. 8 (b), one form of inductor component will be described. The basic configuration of FIG. 8 (a) is a configuration in which the whole is formed in a columnar shape. Thereby, the columnar body in the drum type magnetic core 51 is a columnar body,
One flange is a disk-shaped lower flange 57 and the other flange is a disk-shaped upper flange 56. Further, both the permanent magnets 53a and 53b are cylindrical, and the sleeve core is a cylindrical sleeve core 58.

Referring to FIG. 8 (c), another form of inductor component will be described. The basic configuration of FIG. 8 (a) is a configuration in which the whole is formed in a square pole shape. This allows
The columnar body of the drum type magnetic core 51 is a square columnar body, one flange is a square plate-like lower flange 60, and the other flange is a square plate-like upper flange 59. Each of the permanent magnets 53a and 53b has a square tubular shape, and the sleeve core is a square tubular sleeve core 61.
It is shown that.

In any form of inductor component,
The drum-shaped magnetic core 51 is formed by pressing a Ni—Zn-based ferrite powder into a columnar shape or a quadrangular prism shape, calcining, cutting, and then forming a drum shape, and performing main sintering. After pressing and sintering in advance into a columnar or square column,
Although cutting may be performed, in this case, there is a disadvantage that the cost is increased even if the dimensional accuracy is increased. Further, the cylindrical sleeve core 58 and the square tubular sleeve core 61 are manufactured by using Ni—Zn ferrite powder and pressing and sintering into a cylindrical or square tubular shape.

Further, the permanent magnets 53a and 53b have the configuration shown in FIG.
In the case of the embodiment shown in FIG. 2B, the composition is Sm (Co _0.742 F
e _0.20 Cu _0.055 Zr _0.029 ) _7.7 , average particle size 5 μm
The maximum particle size is 45 μm and the intrinsic coercive force H _c is 15.
8 × 10 ⁵ (A / m) or more, Curie temperature _Tc is 770
C. rare earth magnet powder was used. The surface of the rare earth magnet powder is coated with Zn, and a polyamideimide resin is kneaded and molded at a volume ratio of 40% as a binder, and the specific resistance is 0.5 Ωcm.
It was produced so as to be as described above.

The structure of the drum type magnetic core 51 and the cylindrical sleeve core 58 used here has a magnetic path length of 1.85 c.
m, effective area is 0.07 cm ² , gap is 80 μm
Can be exemplified. The winding 52 is wound 15 turns, the DC resistance is 20 mΩ, and the permanent magnets 53a,
53b can be exemplified by using a thickness of 70 μm.

Here, as a comparative example, FIG.
In the configuration shown in FIG. 10B, an inductor component having a magnetic path length of 1.85 cm, an effective area of 0.07 cm ² , and a thickness of the insulator 74 of 80 μm is shown in FIGS. 10A and 10B. With the configuration, the magnetic path length is 1.85 cm and the effective area is 0.07 cm
^2. An inductor part having a thickness of 1 mm was manufactured by trial using Ba ferrite as the permanent magnet 83.

Therefore, the DC superimposed inductance characteristics of these inductor components were also measured.
The result was almost the same as the case shown in FIG. Therefore,
Also in the case of the inductor component according to one embodiment of the fifth embodiment, compared with the inductor component of the conventional comparative example, the DC superimposed inductance characteristic is improved by almost 50% as compared with the inductor component not using the magnetic bias, and the magnetic bias is used. No decrease in the initial inductance value due to a decrease in the effective magnetic permeability is observed.

These results are the same as in the case where each inductor component is applied to a transformer. The results show that the processing power Po can be greatly increased not only by improving the DC superimposed inductance characteristic but also by increasing the magnetic flux density width ΔB ′. ing. In addition, the number of windings of the winding 52 can be reduced along with the increase of the magnetic flux density width ΔB ′, and a reduction in loss and a reduction in size can be achieved.

In the fifth embodiment, the inductor component of one embodiment shown in FIG. 8B has been mainly described.
Substantially equivalent results can be obtained for the inductor component of another embodiment shown in FIG.

Hereinafter, several embodiments related to the magnetic characteristics of the permanent magnet 13 for applying a magnetic bias used in the inductor component according to the first embodiment will be described.

(Embodiment 6) In Embodiment 6, the conventional technique is used.
The problem of thermal demagnetization, that is, in the reflow soldering process
For durability against heat, powders for permanent magnets
High Curie temperature T _cSmCo based rare earth magnet powder
Measures to prevent thermal demagnetization.
are doing.

In the inductor component having the structure used in the first embodiment, the permanent magnet 13 having a Curie temperature _Tc of 770 ° C. is mounted, and the inductor component having the structure shown in FIGS. In contrast to the conventional method, in which a permanent magnet 83 made of Ba ferrite having a Curie temperature _Tc as low as 450 ° C. is mounted, the temperature is maintained for 1 hour in a constant temperature bath at 270 ° C., which is the condition of a reflow furnace, to cool to room temperature. The DC superposition inductance characteristics after the measurement were measured, and the results shown in Table 1 were obtained.

[0094]

[Table 1]

Table 1 shows that the high Curie temperature according to Example 1 was used.
Degree T_cUsing SmCo-based rare earth magnet powder having
In the case of an inductor component with a permanent magnet 13,
No change in DC superimposed inductance characteristics before and after
Curie temperature T _cIs as low as 450 ° C
Conventional inductor components with ferrite magnets
Irreversible demagnetization caused by DC superimposed inductance
It can be seen that deterioration has occurred. Therefore, reflow soldering
In order to provide durability against
Curie temperature T_cIs rare earth whose temperature is 500 ℃ or more
It is necessary to use magnet powder. In addition, SmCo magnet
Among the powders, the composition is Sm (Co_bal.Fe_0.15-0.25 C
u_0.05-0.06 Zr_0.02-0.03 )_7.0-8.5 The so-called third
Generation Sm _TwoCo₁₇Rare earth magnet powder with composition called magnet
Can further suppress demagnetization due to heat.
it can.

Therefore, the inductor of the configuration used in the first embodiment is
Component, the composition is Sm (Co _0.742 Fe_0.20Cu
_0.055 Zr_0.029 )_7.7 With the permanent magnet 13
And the so-called third generation Sm_TwoCo₁₇Composition called magnet
Is Sm (Co_0.78Fe_0.11Cu_0.10Zr_0.01)_7.7 In
Of the reflow furnace,
Hold for 1 hour in a constant temperature bath at 270 ° C to reach room temperature
The measured DC superimposed inductance characteristics after cooling
At this time, the results shown in Table 2 were obtained.

[0097]

[Table 2]

Table 2 shows that the composition is Sm (Co _bal. Fe
_0.15-0.25 Cu _0.05-0.06 Zr _{0.02-0 .03) 7.0-8.5} inductor component and the permanent magnet 13 is mounted is, the contrast change in the DC superposition inductance characteristics before and after the reflow is not observed, composition Sm ( Co _0.78 Fe _0.11 Cu _0.10
It can be seen that the DC superposed inductance characteristic of the inductor having the permanent magnet 13 of Zr _0.01 ) _7.7 is deteriorated. Therefore, in order to make the permanent magnet 13 durable against heating or the like in the reflow soldering process, the permanent magnet 13 has a third generation Sm (Co _bal. Fe _0.15-0.25 Cu
It is necessary to use a rare earth magnet powder of _0.05-0.06 Zr _{0.02 -0.03) 7.0-8.5.}

(Embodiment 7) In Embodiment 7, demagnetization due to an excessive current, which is a problem raised in the prior art, that is, a high intrinsic coercive force is used so that the coercive force of the permanent magnet does not disappear due to a DC magnetic field accompanying the excessive current. is subjected to measures by using a rare earth magnet powder of SmCo-based with H _c (iH _c).

In the inductor component used in the first embodiment,
And the coercive force H_cIs 15.8 × 10 ^Five(A / m) permanent
As shown in FIGS. 10 (a) and 10 (b),
Used in the prior art
Coercive force H_cIs 1.58 × 10^Five(A / m) and 1
Compared to the case where the permanent magnet 83 which is 0 times lower is mounted, 300
A. DC superimposed inductor after applying 50μs excess current
When the conductance characteristics were measured, the results were as shown in Table 3.
It became.

[0101]

[Table 3]

Table 3 shows that the high coercive force H according to Example 1
_In the case of the inductor component mounted with the permanent magnet 13 having the _c , no change in the DC superimposed inductance characteristic is observed before and after the application of the excessive current, whereas the conventional inductor mounted with the permanent magnet 83 having the coercive force _Hc 10 times lower. It can be seen that in the component, demagnetization occurs due to the opposite magnetic field applied to the permanent magnet 83, and the DC superimposed inductance characteristic is reduced. Therefore, in order to make the permanent magnet 13 durable against a DC magnetic field due to an excessive current, it is necessary to use a rare earth magnet powder having a specific coercive force _Hc of 7.9 × 10 ⁵ (A / m) or more. .

Example 8 In Example 8, demagnetization of a permanent magnet caused by the progress of oxidization with time, which was a problem in the prior art, that is, coating of metal or alloy so that the magnet powder did not oxidize. We take measures by doing.

In the inductor component having the structure used in the first embodiment, two types, one with the permanent magnet 13 coated with Zn and the other with the permanent magnet not coated with Zn, were immersed in saline for 200 minutes. When the DC superimposed inductance characteristics were measured after being left for a natural time, the results shown in Table 4 were obtained.

[0105]

[Table 4]

Table 4 shows that in the case of the inductor component with the Zn-coated permanent magnet 13 according to the first embodiment, the PCT
While no change in the DC superimposed inductance characteristic was observed before and after, in the inductor component equipped with the permanent magnet 13 not coated with Zn, deoxidization occurred due to the progress of oxidization with time, thereby causing the DC superimposed inductance characteristic. It can be seen that the deterioration occurs. Therefore, in order to suppress demagnetization due to the progress of oxidation, it is necessary to coat the rare earth magnet powder of the permanent magnet 13 with a metal or an alloy. Further, the rare earth magnet powder may be coated with an inorganic glass, or a metal or alloy may be coated with a nonmetallic inorganic compound. in addition,
If the average particle diameter of the rare earth magnet powder is 2.5 to 25 μm and the maximum particle diameter is 50 μm or less, it is possible to suppress oxidation during the manufacturing process.

Therefore, in the inductor component having the structure used in Example 1, the permanent magnet 13 having the rare earth magnet powder having an average particle size of 5 μm and the maximum particle size of 45 μm was mounted. The DC superposition inductance characteristic was measured with respect to a magnet having a permanent magnet having a particle size of 2 μm, and the results shown in Table 5 were obtained.

[0108]

[Table 5]

Table 5 shows that in the case of an inductor component equipped with a permanent magnet 13 using a rare-earth magnet powder having an average particle size of 5 μm and a maximum particle size of 45 μm, the DC bias inductance characteristic (inductance value) due to magnetic bias is 50 μm. %
It can be seen that the improvement is only 15% for the inductor component equipped with the permanent magnet 13 using the rare earth magnet powder having an average particle diameter of 2 μm, whereas the improvement is improved. Therefore, in order to suppress oxidation during the manufacturing process, the rare earth magnet powder used for the permanent magnet 13 needs to have a powder average particle size of 2.5 to 25 μm and a maximum particle size of 50 μm or less.

(Embodiment 9) Embodiment 9 solves the problem of the core loss increase due to the low specific resistance of the permanent magnet, which is a problem in the prior art. Measures are taken as 30% or more.

In the inductor component having the structure used in Example 1, the content of the resin with respect to the rare earth magnet powder was set to 40V.
% and the specific resistance is 0.5 Ωcm.
And the resin content is 20 Vol%,
The core loss was measured for a permanent magnet 13 having a specific resistance of 0.05 Ωcm and a permanent magnet 13 having a resin content of 30 Vol% and a specific resistance of 0.1 Ωcm. Table 6 shows the results.

[0112]

[Table 6]

Table 6 shows that the content of the resin was 30 Vol%
With respect to the core loss of the inductor component described above, it can be seen that, when the content of the resin is set to 20 Vol% and the specific resistance is set to 0.05 Ωcm, the loss is caused by the eddy current flowing, and the core loss is deteriorated. In addition, the resin content is 3
What is 0 Vol% and the specific resistance is 0.1 Ωcm
Resin content is 40Vol% and specific resistance is 0.5Ωc
It can be seen that the core loss is almost the same as that of the case of m. Therefore, in order to suppress an increase in air loss due to a decrease in the specific resistance of the permanent magnet 13, the content of the resin with respect to the rare earth magnet powder used for the permanent magnet 13 is set to 30 Vol% or more, and the specific resistance is set to 0.1 Ωcm or more. It is necessary.

Note that, in the above-described Embodiments 6 to 9, Embodiment 1
The supplementary items related to the magnetic characteristics of the permanent magnet 13 for applying a magnetic bias used in the inductor component according to the above have been described, but these supplementary items are described in each of the other embodiments (Example 2).
5) permanent magnets (permanent magnets 23, 33a, 33b, 43,
53a, 53b) are similarly applied.

[0115]

As described above, according to the inductor component of the present invention, the permanent magnet for applying a magnetic bias and the sleeve core, which have been used for different types of conventional products, are combined. The permanent magnet is arranged so as to apply a DC magnetic field to at least one gap in a closed magnetic path formed by the drum-shaped magnetic core and the sleeve core in a direction opposite to the direction of the magnetic field generated by the magnetomotive force generated by the winding. By expanding the usable magnetic flux density width,
In addition, a permanent magnet is used as a rare earth magnet powder having excellent magnetic properties and a resin is contained in an appropriate amount, and a specific resistance value is obtained by coating a metal or an alloy with an appropriate particle size so that a specific resistance value can be obtained more than a predetermined value. Since the rare earth magnet powder is coated with inorganic glass, or the metal or alloy is coated with a non-metallic inorganic compound, the produced inductor component has a large current that can be handled and its magnetic properties are hardly impaired, Miniaturization·
The weight can be easily reduced. As a result of this,
Industrial transformers, such as miniaturization and low loss of transformers and choke coils for switching power supplies using inductor components, and can greatly contribute to miniaturization and high efficiency of power supply circuits themselves using inductor components. It will be extremely beneficial.

[Brief description of the drawings]

FIGS. 1A and 1B are views for explaining a magnetic bias effect by an inductor component of the present invention, in which FIG. 1A relates to a magnetic flux density B-magnetic field H characteristic including a magnetic flux density width ΔB before application of a magnetic bias, and FIG. ) Relates to the magnetic flux density B-magnetic field H characteristics including the magnetic flux density width ΔB ′ after the application of the magnetic bias, and (c) relates to the DC superimposed inductance characteristics (changes) due to the magnetic bias, which is expressed by the inductance with respect to the output current. It is.

FIGS. 2A and 2B show a basic configuration of an inductor component according to a first embodiment of the present invention, in which FIG. 2A is related to a side sectional view, FIG. (C) relates to an external perspective view of another form partially seen through.

3 (a) and 9 (b) and FIGS. 9 (a) and 10 (a) show one embodiment of the inductor component according to the first embodiment shown in FIG. 2 (b).
FIG. 9B is a comparison result of a DC superimposed inductance characteristic indicated by a relationship between a current value and an inductance value in the conventional inductor component shown in FIG.

4A and 4B show a basic configuration of an inductor component according to a second embodiment of the present invention, in which FIG. 4A is related to a side sectional view, FIG. 4B is related to an external perspective view of one embodiment partially transparent, (C) relates to an external perspective view of another form partially seen through.

5A and 5B show a basic configuration of an inductor component according to a third embodiment of the present invention, in which FIG. 5A is related to a side sectional view, FIG. 5B is related to an external perspective view of one embodiment partially transparent, (C) relates to an external perspective view of another form partially seen through.

6 (a), 6 (b), 10 (a), and 10 (a).
FIG. 9B is a comparison result of a DC superimposed inductance characteristic indicated by a relationship between a current value and an inductance value in the conventional inductor component shown in FIG.

7A and 7B show a basic configuration of an inductor component according to a fourth embodiment of the present invention, in which FIG. 7A is related to a side sectional view, FIG. 7B is related to an external perspective view of one embodiment partially transparent, (C) relates to an external perspective view of another form partially seen through.

8A and 8B show a basic configuration of an inductor component according to a fifth embodiment of the present invention, in which FIG. 8A is related to a side sectional view, FIG. 8B is related to an external perspective view of one embodiment partially transparent, (C) relates to an external perspective view of another form partially seen through.

9A and 9B show a basic configuration of an example of a conventional inductor component, in which FIG. 9A is related to a side sectional view, and FIG. 9B is related to a partially transparent external perspective view.

10A and 10B show a basic configuration of another example of a conventional inductor component, in which FIG. 10A relates to a side sectional view, and FIG.
Is related to an external perspective view partially seen through.

[Explanation of symbols]

11, 21, 31, 41, 51, 71, 81 Drum type magnetic cores 12, 22, 32, 42, 52, 72, 82 Windings 13, 23, 33a, 33b, 43, 53a, 53b,
83 permanent magnets 16, 26, 36, 46, 56, 76, 86 disc-shaped upper flanges 17, 27, 37, 47, 57, 77, 87 disc-shaped lower flanges 18, 28, 38, 48, 58, 78 Column-shaped sleeve cores 19, 29, 39, 49, 59 Square plate-shaped upper flanges 20, 30, 40, 50, 60 Square plate-shaped lower flanges 21, 31, 41, 51, 61 Square cylindrical pillar-shaped sleeve core 74 Insulator 88 Terminal

Continued on the front page (72) Inventor Toru Ito 6-7-1, Koriyama, Taishiro-ku, Sendai-shi, Miyagi Prefecture Tokinnai Co., Ltd. (72) Inventor Teruhiko Fujiwara 6-7-1, Koriyama, Tashiro-ku, Sendai, Miyagi Co., Ltd. Tokinnai (72) Inventor Masayoshi Ishii 6-7-1, Koriyama, Taishiro-ku, Sendai, Miyagi Prefecture Tokinnai, Inc. (72) Inventor Haruki Hashi 6-7-1, Koriyama, Tashiro-ku, Sendai, Miyagi Tokinnai, Inc. (72) Inventor Ryutaro Isoda 6-7-1, Koriyama, Tajiro-ku, Sendai City, Miyagi Prefecture Tokin Co., Ltd. (72) Inventor Tadakuni 7-7-1, Koriyama, Tajiro-ku, Sendai City, Miyagi Prefecture Tokinnai Co., Ltd.

Claims (9)

[Claims] 1. A drum-shaped magnetic core made of a magnetic material having a structure in which flanges are integrally formed at both ends of a columnar body, and provided around the columnar body of the drum-shaped magnetic core and sandwiched between the flanges. Component comprising: a wound winding; and a permanent magnet disposed in the vicinity of the drum-shaped magnetic core around which the winding is wound, wherein the sleeve component is provided outside the drum-shaped magnetic core. The permanent magnet generates a DC magnetic field in a direction opposite to the direction of the magnetic field generated by the magnetomotive force generated by the winding in at least one gap in a closed magnetic path formed by the drum-type magnetic core and the sleeve core. An inductor component, which is arranged to apply a voltage. 2. The inductor component according to claim 1, wherein
The permanent magnet is made of polyamide-imide resin, polyimide
Resin, epoxy resin, polyphenylene sulfide tree
Fat, silicone resin, polyester resin, aromatic polymer
Selected from amide resin and liquid crystal polymer
Coercive force H for one type of resin _cIs 7.9 × 1
0^Five(A / m) or more, Curie temperature T_cIs below 500 ° C
Above, rare earth magnet powder with powder average particle size of 2.5 to 25 μm
And the surface is made of Zn, Al, Bi, G
a, In, Mg, Pb, Sb, and Sn
Is also covered with a kind of metal or alloy, containing the resin
The volume is 30% or more by volume and the specific resistance is 0.1 Ωcm
An inductor component characterized by the above. 3. The inductor component according to claim 2, wherein the rare earth magnet powder has a composition of Sm (Co _bal. Fe) _.
Inductor component which is a _{0.15-0.25 Cu 0.05-0.06 Zr 0.02-0.03) 7.0- 8.5} . 4. The inductor component according to claim 2, wherein the rare-earth magnet powder is coated with an inorganic glass having a softening point of 220 ° C. or more and 550 ° C. or less. 5. The inductor component according to claim 2, wherein the metal or the alloy coated on the rare earth magnet powder is coated with a nonmetallic inorganic compound having a melting point of at least 300 ° C. or higher. Features inductor components. 6. The inductor component according to claim 4, wherein an addition amount of the inorganic glass or the non-metallic inorganic compound is in a range of 0.1% to 10% by volume ratio. Inductor parts. 7. The inductor component according to claim 2, wherein the permanent magnet is made magnetically anisotropic by orienting the rare earth magnet powder in a thickness direction with a magnetic field. An inductor component characterized by the following. 8. The inductor component according to claim 2, wherein the permanent magnet has a magnetizing magnetic field of 2.
An inductor component having a temperature of 5T or more. 9. The inductor component according to claim 2, wherein the permanent magnet has a center line average roughness Ra of 10 μm or less.