TW201712699A - Dust core, method for producing said dust core, electric/electronic component provided with said dust core, and electric/electronic device on which said electric/electronic component is mounted - Google Patents

Abstract

Provided is a dust core which contains a powder of a crystalline magnetic material such as carbonyl iron, and which contains, as a dust core having excellent magnetic characteristics, a powder of a crystalline magnetic material and a powder of an amorphous magnetic material. This dust core is characterized in that a first mixing ratio, which is the mass ratio of the content of the powder of a crystalline magnetic material relative to the sum of the content of the powder of a crystalline magnetic material and the content of the powder of an amorphous magnetic material, is from 75% by mass to 95% by mass (inclusive).

Description

Powder magnetic core, method for manufacturing the powder magnetic core, electric ‧ electronic parts including the powder magnetic core, and electric ‧ electronic machine with the electric ‧ electronic parts

The present invention relates to a powder magnetic core, a method of manufacturing the powder magnetic core, an electric ‧ electronic component including the powder magnetic core, and an electric ‧ electronic device equipped with the electrical ‧ electronic component

A powder magnetic core used in a booster circuit of a hybrid electric vehicle or the like, a reactor for power generation, a transformer, a transformer, a choke coil, or the like can be formed by compacting a large amount of soft magnetic powder, and The obtained shaped product was obtained by heat treatment.

Patent Document 1 discloses a method for producing a granulated product and an inductor using the granulated product produced by the method for producing the granulated product, the method for producing the granulated product comprising: a step of producing a mixture, The magnetic powder, the resin, the low boiling point solvent, and the high boiling point solvent are mixed to prepare a slurry mixture; and the first drying step is performed by heating the slurry mixture to evaporate the low boiling point solvent to produce a paste mixture. a granulation step of granulating by pulverizing the paste mixture through a sieve to obtain granules; and a second drying step of heating the particles to evaporate the high boiling solvent , obtaining magnetic particles.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2014-125655

In the above-mentioned Patent Document 1, as a specific example, a case where a magnetic powder containing carbonyl iron powder (hereinafter referred to as "CIP") having a particle diameter of 3 to 5 μm is used is disclosed. The use of CIP mainly results in a higher magnetic permeability and an increase in DC superposition characteristics, which is preferable.

SUMMARY OF THE INVENTION An object of the present invention is to provide a powder magnetic core which contains a powder of a crystalline magnetic material such as CIP and which has excellent magnetic properties. Another object of the present invention is to provide a method for producing the powder magnetic core, an electric ‧ electronic component including the powder magnetic core, and an electric ‧ electronic device having the electric ‧ electronic component mounted thereon

In order to solve the above problems, the inventors of the present invention conducted research and obtained a new finding that a powder magnetic core contains not only a powder of a crystalline magnetic material such as CIP but also a specific amount of amorphous magnetic material. A powder of material that improves magnetic properties.

The present invention, which is completed based on the above findings, is a powder magnetic core characterized in that it contains a powder of a crystalline magnetic material and a powder of an amorphous magnetic material, and the crystalline magnetic material is The mass ratio of the powder to the total of the content of the powder of the crystalline magnetic material and the powder of the amorphous magnetic material, that is, the first mixing ratio is 75 mass% or more and 95 mass% or less. The iron loss Pcv is easily lowered by causing the powder magnetic core to contain not only the powder of the crystalline magnetic material but also the powder of the specific amount of the amorphous magnetic material.

It is preferable that the first mixing ratio is 80% by mass or more and 90% by mass or less to more stably improve the magnetic properties of the powder magnetic core.

There is a case where the powder of the above crystalline magnetic material preferably contains a material subjected to insulation treatment.

The crystalline magnetic material may be selected from the group consisting of Fe-Si-Cr alloys, Fe-Ni alloys, Fe-Co alloys, Fe-V alloys, Fe-Al alloys, Fe-Si alloys, and One or two or more materials selected from the group consisting of Fe-Si-Al alloys, carbonyl iron (CIP), and pure iron. There are cases in which the above crystalline magnetic material preferably contains carbonyl iron (CIP).

The amorphous magnetic material may include one or more selected from the group consisting of Fe-Si-B alloys, Fe-PC alloys, and Co-Fe-Si-B alloys. . There are cases where the amorphous magnetic material preferably contains an Fe-P-C based alloy.

There is a case where the powder of the amorphous magnetic material has a median diameter D50 of preferably 20 μm or less.

The composition may be a combination of a powder of the crystalline magnetic material and a powder of the amorphous magnetic material bonded to another material contained in the powder magnetic core. In this case, the above-mentioned bonding component preferably contains a component based on a resin material.

In another aspect, the present invention provides a method for manufacturing a powder magnetic core, which is characterized by the method for manufacturing the powder magnetic core of the present invention, and includes a forming step by a forming process. A molded article is obtained, which comprises press forming a mixture of the powder containing the crystalline magnetic material and the powder of the amorphous magnetic material and a binder component containing the resin material.

Alternatively, the above-mentioned molded article obtained by the above-described forming step may be the above-described powder magnetic core. Alternatively, it may include a heat treatment step of obtaining the above-mentioned powder magnetic core by heat-treating the above-mentioned formed product obtained by the above-described forming step.

In another aspect, the present invention is an electric ‧ electronic component comprising the powder magnetic core of the present invention, a coil, and a connection terminal connected to each end of the coil, and at least the powder magnetic core A part is disposed in an induced magnetic field generated by the current when a current flows through the connection terminal through the connection terminal. The electric ‧ electronic component can reduce iron loss based on the excellent characteristics of the above-mentioned powder magnetic core.

In still another aspect of the invention, an electric/electronic device is mounted to the electric ‧ electronic component of the invention, and the electrical ‧ electronic component is connected to the substrate via the connection terminal As the electric ‧ electronic device, a power supply device such as a power switch circuit, a voltage step-up circuit, a smoothing circuit, or the like, a small portable communication device, or the like can be exemplified. Since the electric ‧ electronic device of the present invention includes the electric ‧ electronic component of the present invention described above, it is easy to cope with a large current and a high speed.

The powder magnetic core of the above invention can have excellent magnetic properties as compared with a powder magnetic core having a magnetic powder containing a powder of a crystalline magnetic material. Moreover, according to the present invention, there is provided a method of manufacturing the powder magnetic core, an electric ‧ electronic component including the powder magnetic core, and an electric ‧ electronic device having the electrical ‧ electronic component mounted thereon

1‧‧‧Powder core (ring core)

2‧‧‧covered conductive wire

2a‧‧‧ coil

2b, 2c‧‧‧ exposed end

2d, 2e‧‧‧ end of coil 2a

3‧‧‧Powder core

3a‧‧‧Moulding surface of powder core 3

3b, 3c‧‧‧ side of the powder core 3

4‧‧‧ Terminals

5‧‧‧ coil

5a‧‧‧Winding section of coil 5

5b‧‧‧ lead end of coil 5

10‧‧‧Circular coil

20‧‧‧Inductive components

30‧‧‧ Storage recess

40‧‧‧Connecting end

42a‧‧‧1st twist

42b‧‧‧2nd twist

100‧‧‧Installation substrate

110‧‧‧Taiwan Department

120‧‧‧ solder layer

200‧‧‧ spray dryer unit

201‧‧‧Rotor

P‧‧‧Powder powder

S‧‧‧Slurry

Fig. 1 is a perspective view conceptually showing the shape of a powder magnetic core according to an embodiment of the present invention.

Fig. 2 is a view conceptually showing a spray dryer device used in an example of a method for producing a granulated powder and an operation thereof.

Fig. 3 is a perspective view conceptually showing the shape of a toroidal core as an electric/electronic part having a powder magnetic core according to an embodiment of the present invention.

Fig. 4 is a perspective view partially showing the overall configuration of an inductance element as an electric/electronic part having a powder magnetic core according to another embodiment of the present invention.

Fig. 5 is a partial front elevational view showing a state in which the inductance element shown in Fig. 4 is mounted on a mounting substrate.

Fig. 6 is a graph showing the results of fitting the dependence of the constant k _h in the powder magnetic core of the powder of the amorphous magnetic material having a median diameter D50 of 5 μm with respect to the first mixing ratio.

Fig. 7 is a graph showing the results of fitting the dependence of the constant k _e in the powder magnetic core of the powder of the amorphous magnetic material having a median diameter D50 of 5 μm with respect to the first mixing ratio.

Fig. 8 is a graph showing the results of fitting the dependence of the constant k _h in the powder magnetic core of the powder of the amorphous magnetic material having a median diameter D50 of 8 μm with respect to the first mixing ratio.

Fig. 9 is a graph showing the results of fitting the dependence of the constant k _e in the powder magnetic core of the powder of the amorphous magnetic material having a median diameter D50 of 8 μm with respect to the first mixing ratio.

Fig. 10 is a graph showing the results of fitting the dependence of the relative magnetic permeability μ' in the powder magnetic core of the powder of the amorphous magnetic material having a median diameter D50 of 5 μm with respect to the first mixing ratio.

Fig. 11 is a graph showing the results of fitting the dependence of Isat on the powder mixture core of the powder of the amorphous magnetic material having a median diameter D50 of 5 μm with respect to the first mixing ratio.

Figure 12 is a summary of the iron loss ratio and initial permeability of a powder magnetic core containing a powder of an amorphous magnetic material having a median diameter D50 of 5 μm and a first mixing ratio in the range of 50% by mass to 100% by mass. A plot of ratio and Isat ratio.

Hereinafter, embodiments of the present invention will be described in detail.

Powder magnetic core

The powder magnetic core 1 according to an embodiment of the present invention shown in Fig. 1 has a ring-like appearance and contains a powder of a crystalline magnetic material and a powder of an amorphous magnetic material. The powder magnetic core 1 of the present embodiment is manufactured by a manufacturing method including a forming process including press forming including a mixture of the powders. The powder magnetic core 1 of the present embodiment contains a powder of a crystalline magnetic material and a powder of an amorphous magnetic material in combination with other materials contained in the powder magnetic core 1 (the same material is present). Situation, There are also combinations of components in the case of heterogeneous materials. Hereinafter, the components will be described.

(1) Powder of crystalline magnetic material

The crystalline magnetic material which provides the powder of the crystalline magnetic material contained in the powder magnetic core 1 of the embodiment of the present invention satisfies the crystal quality (determined by the usual X-ray diffraction measurement to have a specific material type) The diffraction spectrum of the peak of the degree is clearly defined, and the conditions of the ferromagnetic body are not limited in specific types. Specific examples of the crystalline magnetic material include Fe-Si-Cr alloy, Fe-Ni alloy, Fe-Co alloy, Fe-V alloy, Fe-Al alloy, Fe-Si alloy, and Fe. -Si-Al alloy, carbonyl iron (CIP) and pure iron. The above crystalline magnetic material may contain one material or a plurality of materials. The crystalline magnetic material which provides the powder of the crystalline magnetic material is preferably one or more selected from the group consisting of the above materials, and preferably contains CIP, more preferably CIP. Composition.

The shape of the powder of the crystalline magnetic material contained in the powder magnetic core 1 according to the embodiment of the present invention is not limited. The shape of the powder may be spherical or non-spherical. In the case of being non-spherical, it may have a shape having an anisotropic shape such as a scaly shape, an elliptical shape, a droplet shape, or a needle shape, or may be an indefinite shape having no special shape anisotropy. Examples of the powder of an indefinite shape include a case where a plurality of spherical powders are brought into contact with each other, or are joined in such a manner as to be partially buried in another powder. Such an irregularly shaped powder is easily observed when it is CIP.

The shape of the powder may be a shape obtained in the stage of producing the powder, or may be a shape obtained by secondary processing of the produced powder. The shape of the former may be, for example, a spherical shape, an elliptical shape, a droplet shape, or a needle shape, and the shape of the latter may be scaly.

The particle size of the powder of the crystalline magnetic material contained in the powder magnetic core 1 according to the embodiment of the present invention is not limited. If the median particle diameter D50 (particle size in the volume distribution of the particle diameter of the soft magnetic powder measured by the laser diffraction scattering method is 50%) The particle diameter is usually in the range of 1 μm to 20 μm. The powder of the crystalline magnetic material has a median diameter D50 (also referred to in the present specification as a viewpoint of improving the operability, the viewpoint of increasing the packing density of the powder of the crystalline magnetic material in the powder magnetic core, and the like). The "first median diameter d1") is preferably 1 μm or more and 15 μm or less, more preferably 1 μm or more and 10 μm or less, and particularly preferably 1 μm or more and 5 μm or less.

Preferably, at least a part of the powder of the crystalline magnetic material is composed of a material subjected to insulation treatment, and more preferably a powder of the crystalline magnetic material is composed of a material subjected to insulation treatment. When the powder of the crystalline magnetic material was subjected to an insulating treatment, the tendency of the insulation resistance of the powder magnetic core to be improved was observed.

There is no limitation on the type of insulation treatment to be performed on the powder of the crystalline magnetic material. Phosphoric acid treatment, phosphate treatment, oxidation treatment, sol ‧ gel method, and the like can be exemplified.

The mass ratio of the content of the powder of the crystalline magnetic material to the sum of the content of the powder of the crystalline magnetic material and the content of the powder of the amorphous magnetic material (unit: mass%, also referred to as "first mixing" in the present specification The ratio ") is preferably 75 mass% or more and 95 mass% or less. By setting the first mixing ratio within the above range, it is observed that the iron loss Pcv tends to be lowered. The first mixing ratio is preferably 78% by mass or more and 93% by mass or less, and more preferably 80% by mass or more and 90% by mass or less, from the viewpoint of excellent balance with other magnetic properties such as magnetic permeability.

(2) Powder of amorphous magnetic material

The amorphous magnetic material which provides the powder of the amorphous magnetic material contained in the powder magnetic core 1 of the embodiment of the present invention satisfies the amorphous state (obtained by the usual X-ray diffraction measurement) The diffraction spectrum of the peak of the peak of the material type and the conditions of the ferromagnetic body, especially the soft magnetic body, are not limited in specific types. Specific examples of the amorphous magnetic material include an Fe—Si—B based alloy, an Fe—P—C based alloy, and a Co—Fe—Si—B based alloy. The amorphous magnetic material may include one material or a plurality of materials. The magnetic material constituting the powder of the amorphous magnetic material is preferably selected from the above materials One or two or more kinds of the constituents of the group preferably contain an Fe-P-C alloy, and more preferably an Fe-P-C alloy.

Specific examples of the Fe-PC-based alloy include a composition formula of Fe _{100 atom%-abcxyzt} Ni _a Sn _b Cr _c P _x C _y B _z Si _t , and 0 atom% ≦a ≦ 10 atom%, 0 atom. %≦b≦3 atom%, 0 atom%≦c≦6 atom%, 6.8 atom%≦x≦12.8 atom%, 2.2 atom%≦y≦11.8 atom%, 0 atom%≦z≦9.6 atom%, 0 atom % ≦t ≦ 7 atom% of Fe-based amorphous alloy. In the above composition formula, Ni, Sn, Cr, B, and Si are arbitrarily added elements.

The amount of addition of a is preferably 0 atom% or more and 6 atom% or less, and more preferably 0 atom% or more and 4 atom% or less. The amount b of Sn added is preferably 0 atom% or more and 2 atom% or less, and more preferably 1 atom% or more and 2 atom% or less. The amount c of addition of Cr is preferably 0 atom% or more and 3 atom% or less, and more preferably 1 atom% or more and 2.5 atom% or less. The addition amount x of P is preferably set to 8.8 atom% or more. The addition amount y of C is preferably 5.8 atom% or more and 8.8 atom% or less. The amount of addition z of B is preferably 0 atom% or more and 9 atom% or less, and more preferably 0 atom% or more and 8 atom% or less. The addition amount t of Si is preferably 0 atom% or more and 6 atom% or less, and more preferably 0 atom% or more and 5.5 atom% or less.

The shape of the powder of the amorphous magnetic material contained in the powder magnetic core 1 according to the embodiment of the present invention is not limited. The type of the shape of the powder is the same as that of the powder of the crystalline magnetic material, and thus the description thereof is omitted. There is also a case where the amorphous magnetic material is easily formed into a spherical shape or an ellipsoidal shape due to the relationship between the manufacturing methods. Further, in general, since the amorphous magnetic material is harder than the crystalline magnetic material, it is preferable that the crystalline magnetic material is made non-spherical and deformed easily during press molding.

The shape of the powder of the amorphous magnetic material contained in the powder magnetic core 1 according to the embodiment of the present invention may be a shape obtained in the stage of producing the powder, or may be performed twice by the powder to be produced. The shape obtained by processing. As the shape of the former, the ball can be exemplified The shape, the elliptical shape, the needle shape, etc., as a shape of the latter, can be illustrated as a scale shape.

The particle size of the powder of the amorphous magnetic material contained in the powder magnetic core 1 according to the embodiment of the present invention is not limited. When the particle diameter is defined by the median diameter D50, it is preferably 20 μm or less. From the viewpoint of improving the operability, it is preferable that the powder of the amorphous magnetic material has a median diameter D50 (also referred to as "second median diameter d2" in the present specification) of 1 μm or more. More preferably, it is 2 μm or more, and particularly preferably 3 μm or more. It is preferable to set the powder median diameter D50 of the amorphous magnetic material to 15 μm or less from the viewpoint of improving the packing density of the powder of the amorphous and crystalline magnetic material in the powder magnetic core 1 . More preferably, it is set to 12 μm or less, and particularly preferably set to 8 μm or less.

The relationship between the first median diameter d1 and the second median diameter d2 is not limited. In general, an amorphous magnetic material is harder than a crystalline magnetic material, and therefore, it is preferable that the first median diameter d1 is relatively small, and the powder of the crystalline magnetic material is easily filled in the filled A void portion generated when a powder of an amorphous magnetic material is used. In this case, it is preferable that d1/d2 is set to 0.8 or less, and it is preferable to set it as 0.5 or less.

(3) Combination ingredients

The binder component is a powder which contributes to the powder of the crystalline magnetic material and the amorphous magnetic material contained in the powder magnetic core 1 of the present embodiment (in the present specification, the powders are also collectively referred to as "the powder". In the case of a magnetic powder, the composition of the material is not limited. Examples of the material constituting the binder component include organic materials such as a thermal decomposition residue of the resin material and the resin material (referred to collectively as "components based on the resin material" in the present specification), inorganic materials, and the like. Examples of the resin material include an acrylic resin, an anthrone resin, an epoxy resin, a phenol resin, a urea resin, and a melamine resin. A glass-based material such as water glass can be exemplified as the bonding component of the inorganic-based material. The bonding component may comprise one material and may also comprise a plurality of materials. The bonding component may also be a mixture of an organic material and an inorganic material.

As the bonding component, an insulating material is usually used. Thereby, the pressure can be increased The insulation of the powder core 1.

2. Method for manufacturing powder magnetic core

The method for producing the powder magnetic core 1 according to the embodiment of the present invention is not particularly limited, and the powder magnetic core 1 can be more efficiently produced by the production method described below.

A method of manufacturing the powder magnetic core 1 according to an embodiment of the present invention includes the forming step described below, and may further include a heat treatment step.

(1) Forming step

First, a mixture containing a magnetic powder and a component which provides a bonding component in the powder magnetic core 1 is prepared. The component which provides a binding component (also referred to as "adhesive component" in the present specification) may be either a combination of the component itself or a material different from the bonding component. Specific examples of the latter include a case where the binder component is a resin material, and a binder component is a thermally decomposed residue.

The shaped article can be obtained by a forming process including press forming of the mixture. The pressurization conditions are not limited, and are appropriately determined based on the composition of the binder component and the like. For example, when the binder component contains a thermosetting resin, it is preferred to heat it together with pressurization to harden the resin in the mold. On the other hand, in the case of compression molding, although the pressing force is high, heating is not an essential condition, and the pressurization is short.

Hereinafter, a case where the mixture is a granulated powder and compression-molded will be described in some detail. Since the granulated powder is excellent in handleability, workability in a compression molding step in which the molding time is short and the productivity is excellent can be improved.

(1-1) Granulated powder

The granulated powder contains magnetic powder and binder components. The content of the binder component in the granulated powder is not particularly limited. When the content is too low, it is difficult for the binder component to retain the magnetic powder. Further, when the content of the binder component is too low, in the powder magnetic core 1 obtained by the heat treatment step, the combination of the thermal decomposition residue containing the binder component is difficult. The plurality of magnetic powders are insulated from each other. On the other hand, when the content of the above-mentioned binder component is too high, the content of the binder component contained in the powder magnetic core 1 obtained through the heat treatment step tends to be high. When the content of the binder component in the powder magnetic core 1 becomes high, the magnetic properties of the powder magnetic core 1 are liable to lower. Therefore, the content of the binder component in the granulated powder is preferably 0.5% by mass or more and 5.0% by mass or less based on the total amount of the granulated powder. The content of the binder component in the granulated powder is preferably 1.0% by mass or more based on the total amount of the granulated powder, from the viewpoint of further reducing the possibility of reducing the magnetic properties of the powder magnetic core 1 more stably. The amount of 3.5% by mass or less is more preferably 1.2% by mass or more and 3.0% by mass or less.

The granulated powder may also contain materials other than the above magnetic powder and binder components. As such a material, a lubricant, a decane coupling agent, an insulating filler, or the like can be exemplified. In the case of containing a lubricant, the kind thereof is not particularly limited. It can be an organic lubricant or an inorganic lubricant. Specific examples of the organic-based lubricant include metal soaps such as zinc stearate and aluminum stearate. It is considered that such an organic lubricant is vaporized in the heat treatment step and hardly remains in the powder magnetic core 1.

The method for producing the granulated powder is not particularly limited. The granulated powder may be directly kneaded, and the obtained kneaded material may be pulverized or the like by a known method to obtain a granulated powder, or a dispersing agent may be added to the above components by preparation (for example, The slurry formed by water is dried and pulverized to obtain a granulated powder. The particle size distribution of the granulated powder can also be controlled by sieving or grading after pulverization.

An example of a method of obtaining a granulated powder from the above slurry is a method using a spray dryer. As shown in FIG. 2, a rotor 201 is provided in the spray dryer device 200, and the slurry S is injected from the upper portion of the spray dryer device 200 toward the rotor 201. The rotor 201 is rotated at a specific number of revolutions, and the slurry S is sprayed in the form of droplets by centrifugal force in a chamber inside the spray dryer device 200. Further, hot air is introduced into the chamber inside the spray dryer device 200, whereby the dispersant (water) contained in the droplet-shaped slurry S is volatilized while maintaining the shape of the droplet. As a result, the granulated powder P is formed from the slurry S. The granulated powder P is recovered from the lower portion of the spray dryer device 200. The parameters such as the number of revolutions of the rotor 201, the temperature of the hot air introduced into the spray dryer device 200, and the temperature of the lower portion of the chamber may be appropriately set. Specific examples of the setting range of the parameters are as the number of revolutions of the rotor 201, and may be 4,000 to 6,000 rpm. The temperature of the hot air introduced into the spray dryer device 200 may be 130 to 170 ° C as the temperature of the lower portion of the chamber. List 80~90 °C. Further, the atmosphere and the pressure inside the chamber may be appropriately set. As an example, a gas (air) atmosphere is used in the chamber, and the pressure is set to ₂ mmH ₂ O (about 0.02 kPa) at a pressure difference from atmospheric pressure. The particle size distribution of the obtained granulated powder P can be further controlled by sieving or the like.

(1-2) Pressurization conditions

The pressing conditions in the compression molding are not particularly limited. The composition of the granulated powder, the shape of the molded article obtained by the molding step, and the like may be appropriately set. When the pressing force at the time of compression molding of the granulated powder is too low, the mechanical strength of the molded article is lowered. Therefore, there is a problem that the workability of the molded article is lowered, and the mechanical strength of the powder magnetic core 1 obtained from the molded article is lowered. Further, there is a case where the magnetic properties of the powder magnetic core 1 are lowered or the insulation property is lowered. On the other hand, in the case where the pressing force at the time of compression molding of the granulated powder is too high, it becomes difficult to produce a molding die which can withstand the pressure. Further, the possibility that the compression and pressurization step adversely affects the mechanical properties or magnetic properties of the powder magnetic core 1 is more stably lowered, and it is easy to industrially carry out mass production, and the granulated powder is subjected to compression molding. The pressing force is preferably 0.3 GPa or more and 2 GPa or less, more preferably 0.5 GPa or more and 2 GPa or less, and particularly preferably 0.8 GPa or more and 2 GPa or less.

In the compression molding, the pressure may be applied while heating, or may be performed at normal temperature.

(2) Heat treatment step

The molded article obtained by the forming step can be the powder magnetic core 1 of the present embodiment, and the powder magnetic core 1 can be obtained by subjecting the molded article to a heat treatment step as described below.

In the heat treatment step, by heating the shaped article obtained by the above-described forming step, the magnetic properties are adjusted by correcting the distance between the magnetic powders, and the strain relief imparted to the magnetic powder in the forming step is performed. The magnetic characteristics are adjusted to obtain the powder magnetic core 1.

Since the heat treatment step is for the purpose of adjusting the magnetic properties of the powder magnetic core 1 as described above, the heat treatment conditions such as the heat treatment temperature are set such that the magnetic properties of the powder magnetic core 1 are the best. As an example of the method of setting the heat treatment conditions, a heating temperature of the molded article is changed, and other conditions such as a temperature increase rate and a holding time at the heating temperature are fixed.

The evaluation criteria of the magnetic characteristics of the powder magnetic core 1 when the heat treatment conditions are set are not particularly limited. Specific examples of the evaluation item include the iron loss Pcv of the powder magnetic core 1. In this case, the heating temperature of the molded article may be set so that the iron loss Pcv of the powder magnetic core 1 is the lowest. The measurement conditions of the iron loss Pcv are appropriately set, and examples thereof include a condition of a frequency of 100 kHz and a maximum magnetic flux density of 100 mT.

The atmosphere at the time of heat treatment is not particularly limited. In the case of an oxidizing atmosphere, the possibility of excessive thermal decomposition of the binder component or the possibility of oxidation of the magnetic powder is high. Therefore, it is preferably an inert atmosphere such as nitrogen or argon or a reducing property such as hydrogen. Heat treatment in the atmosphere.

3. Electrical ‧ electronic parts

An electric/electronic component according to an embodiment of the present invention includes the powder magnetic core 1, the coil, and a connection terminal connected to each end portion of the coil according to an embodiment of the present invention. Here, at least a part of the powder magnetic core 1 is disposed so as to be located in an induced magnetic field generated by the current when a current flows through the connection terminal through the connection terminal.

An example of such an electric/electronic component is the toroidal coil 10 shown in Fig. 3. The toroidal coil 10 is provided with a coil 2a which is formed by winding a coated conductive wire 2 by a ring-shaped powder magnetic core (annular core) 1. Portions (baked ends) 2b and 2c in which the conductive wires in the both ends of the covered conductive wire 2 are exposed constitute a connection terminal. The end portions 2d, 2e of the coil 2a can be defined in the portion of the covered conductive wire 2 between the coil 2a and the exposed end portions 2b, 2c. As described above, the electric ‧ electronic component of the present embodiment may be composed of one member for the member constituting the coil and the member constituting the connection terminal.

The electric/electronic component according to an embodiment of the present invention may be provided with a powder magnetic core having a shape different from that of the powder magnetic core 1 according to the embodiment of the present invention. As a specific example of such an electric ‧ electronic component, the inductance element 20 shown in FIG. 4 is mentioned. Fig. 4 is a perspective view partially showing the entire configuration of an inductance element 20 according to an embodiment of the present invention. In Fig. 4, the lower surface (mounting surface) of the inductor element 20 is shown as being upward. Fig. 5 is a partial front elevational view showing a state in which the inductance element 20 shown in Fig. 4 is mounted on the mounting substrate 100.

The inductance element 20 shown in FIG. 4 includes a powder magnetic core 3, a coil 5 embedded in the interior of the powder magnetic core 3, and one of the connection terminals electrically connected to the coil 5 by welding to the terminal portion 4. And constitute.

The coil 5 is formed by spirally winding a wire of an insulating film. The coil 5 has a winding portion 5a and lead ends 5b and 5b drawn from the winding portion 5a. The number of turns of the coil 5 is appropriately set in accordance with the required inductance.

As shown in FIG. 4, in the powder magnetic core 3, a housing recess 30 for accommodating one of the terminal portions 4 is formed on the mounting surface 3a facing the mounting substrate. The housing recess 30 is formed on both sides of the mounting surface 3a and is formed to be open toward the side faces 3b, 3c of the powder magnetic core 3. One of the terminal portions 4 protruding from the side faces 3b and 3c of the powder magnetic core 3 is bent toward the mounting surface 3a, and is housed inside the housing recess 30.

The terminal portion 4 is formed of a thin Cu-shaped base material. The terminal portion 4 is configured to have a connection The end portion 40 is embedded in the interior of the powder magnetic core 3 and electrically connected to the lead ends 5b and 5b of the coil 5; and the first meandering portion 42a and the second meandering portion 42b are exposed to the powder magnetic core The outer surface of 3 is formed by sequentially bending the side faces 3b and 3c of the powder magnetic core 3 to the mounting surface 3a. The connecting end portion 40 is a welded portion that is welded to the coil 5. The first meandering portion 42a and the second meandering portion 42b are solder bonded to the solder joint portion of the mounting substrate 100. The solder joint portion refers to a portion of the terminal portion 4 from which the powder magnetic core 3 is exposed and at least toward the outer side of the powder magnetic core 3.

The connection end portion 40 of the terminal portion 4 and the lead end portion 5b of the coil 5 are joined by resistance welding.

As shown in FIG. 5, the inductance element 20 is mounted on the mounting substrate 100.

A conductor pattern that is electrically connected to the external circuit is formed on the surface of the mounting substrate 100, and one of the conductor patterns is formed to mount the one of the inductive elements 20 to the land portion 110.

As shown in FIG. 5, in the inductance element 20, the mounting surface 3a faces the mounting substrate 100 side, and the first bent portion 42a and the second bent portion 42b which are exposed from the powder magnetic core 3 to the outside are placed on the mounting substrate 100. The portions 110 are joined by a solder layer 120.

In the welding step, the paste-like solder is applied to the land portion 110 by the printing step, and then the second bent portion 42b is attached to the land portion 110 to mount the inductance element 20, and the solder is melted by the heating step. As shown in FIGS. 4 and 5, the second meandering portion 42b faces the land portion 110 of the mounting substrate 100, and the first meandering portion 42a is exposed on the side faces 3b and 3c of the inductance element 20, so that the solder layer 120 is filled in the shape of a corner. The surface of the land portion 110 is fixed to the land portion 110 and is sufficiently diffused and fixed to the surface of both the second meander portion 42b and the first meander portion 42a as the solder joint portion.

4. Electrical ‧ electronic machine

An electric ‧ electronic device according to an embodiment of the present invention is provided with an electric ‧ electronic component including the powder magnetic core of one embodiment of the present invention As such an electric ‧ electronic device, a power switch circuit, a voltage rise and fall circuit, and a smooth current can be exemplified as a large current (for example, in the case of a small inductor of several mm square or so, about 1 A or more) Power supply device such as road.

When a large current flows through a power supply device including a power switch circuit, a voltage riser circuit, a smoothing circuit, etc., the iron loss Pcv of the powder magnetic core provided in the electric/electronic parts incorporated in the power supply device is high, The degree of heat generation becomes high, and the reliability of the device is remarkably lowered. Therefore, it is strongly required to reduce the iron loss Pcv of the powder magnetic core to make it highly efficient. The powder magnetic core of the electric ‧ electronic component provided in the electric ‧ electronic device according to the embodiment of the present invention has a low iron loss Pcv, so that it is highly efficient, even when a large current flows in an electric ‧ electronic device The degree of fever is also relatively low. Therefore, the electrical and electronic equipment according to an embodiment of the present invention is excellent in reliability.

The embodiments described above are described in order to facilitate the understanding of the present invention and are not intended to limit the invention. Therefore, it is intended that all the elements disclosed in the above-described embodiments include all design changes or equivalents falling within the technical scope of the invention.

[Examples]

Hereinafter, the present invention will be more specifically described by the examples, but the scope of the present invention is not limited by the examples and the like.

(Example 1)

(1) Fabrication of Fe-based amorphous alloy powder

A powder of an amorphous magnetic material obtained by weighing with a composition of Fe _{71 atom%} Ni _{6 atom%} Cr _{2 atom%} P _{11 atom%} C _{8 atom%} B _{2 atom%} by a water atomization method As a magnetic powder. The first mixing ratio (the mass ratio of the content of the powder of the crystalline magnetic material to the sum of the content of the powder of the crystalline magnetic material and the content of the powder of the amorphous magnetic material) was 0% by mass. The particle size distribution of the obtained magnetic powder was measured by volume distribution using "Microtrac particle size distribution measuring apparatus MT3300EX" manufactured by Nikkiso Co., Ltd. As a result, the particle diameter of 50% which is 50% in the volume distribution, that is, the median diameter D50 is 5 μm.

(2) Production of granulated powder

97.2 parts by mass of the powder of the amorphous magnetic material, comprising an acrylic resin and 2.5 parts by mass of the insulating binder of the phenol resin and 0.3 parts by mass of the lubricant were mixed in water as a solvent to obtain a slurry. The obtained slurry was dried and granulated using a spray dryer apparatus to obtain a granulated powder having a median diameter D50 of 80 μm.

(3) compression forming

The obtained granulated powder was filled in a mold, and subjected to press molding at a surface pressure of 1.0 GPa to obtain a molded article having a ring shape of an outer diameter of 20 mm, an inner diameter of 12 mm, and a thickness of 3 mm.

(4) Heat treatment

The heat treatment is performed to obtain a toroidal core including a powder magnetic core, that is, the obtained shaped product is placed in a nitrogen gas atmosphere furnace, and the furnace temperature is from room temperature (23 ° C) at a heating rate of 10 ° C / min. The mixture was heated to 400 ° C, maintained at this temperature for 1 hour, and then cooled to room temperature in a furnace.

(Examples 2 to 6)

For the preparation of the magnetic powder, the powder of the amorphous magnetic material used in Example 1 and the powder containing the crystalline magnetic material of the carbonyl iron (CIP) subjected to the insulating treatment (median diameter D50: 4.3) were used. A toroidal core was produced in the same manner as in Example 1 except that the magnetic powder having the following mixing ratio was mixed and the first mixing ratio was changed to the following value.

Example 2 5 mass%

Example 3 10% by mass

Example 4 15% by mass

Example 5 20% by mass

Example 6 30% by mass

(Example 7)

In the preparation of the magnetic powder, the CIP which was subjected to the insulating treatment used in Example 2 or the like was used in place of the powder of the amorphous magnetic material used in Example 1, that is, the first mixing ratio of the magnetic powder was set. 100% by mass, except for the same as in the first embodiment The toroidal core is fabricated in the same manner.

(Example 8)

A powder of an amorphous magnetic material was prepared in the same manner as in the production method of Example 1, except that the median diameter D50 was 8 μm. A toroidal core was produced in the same manner as in Example 1 using the powder of the amorphous magnetic material.

(Test Example 1) Measurement and simulation of iron loss Pcv

The toroidal coil obtained by winding the coated copper wire 15 times on the primary side and winding 10 times on the secondary side on the toroidal magnetic core produced in the first to eighth embodiments, using a BH analyzer (Iwasaki communication) "SY-8217" manufactured by the company, the frequency dependence of the iron loss Pcv (unit: kW/m ³ ) is measured under the condition that the effective maximum magnetic flux density B _{m is} 15 mT (measurement frequency range: 100 kHz to 3 MHz) .

An example of the formula showing the frequency dependence of the iron loss Pcv is a formula represented by the following formula (1).

Pcv=k _h ×f×B _m ^1.6 +k _e ×f ² ×B _m ² (1)

Here, f is the frequency (unit: kHz), B _m is the effective maximum magnetic flux density (unit: mT), k _h and k _e constant, and the unit of the former (constant k _h ) is kW/m ³ /kHz/ (mT) ^1.6 or less, the unit of the latter (constant k _e ) is kW/m ³ /(kHz) ² /(mT) ² .

Using the measurement results of the range of the frequency of 1 MHz to 3 MHz in the measurement results of the iron loss Pcv of the loop coils of Examples 1 to 7, two constants k _h and k _e were obtained for each of the examples. The results are shown in Table 1. In Table 1, the description of the unit of the constant k _h and the constant k _{e is} omitted.

According to the results shown in Table 1, the two constants k _h and k _{e of} the powder magnetic core containing the powder of the amorphous magnetic material having a median diameter D50 of 5 μm were determined relative to the first mixture. The dependence of the ratio. As a result, as shown in FIG. 6, the result of fitting the dependence of the constant k _h with respect to the first mixing ratio is a formula represented by the following formula (2). The correlation coefficient of the following formula (2) is 0.9980. On the other hand, as shown in FIG. 7, the result of fitting the dependence of the constant k _e with respect to the first mixing ratio is a formula represented by the following formula (3). The correlation coefficient of the following formula (3) is 0.9816. Further, in the following formulas (2) and (3), x is the first mixing ratio (unit: mass%).

k _h =2.290×10 ^-7 x ² +4.737×10 ^-6 x-3.748×10 ^-5 (2)

k _e =2.193×10 ^-11 x ² -6.411×10 ^-10 x+2.499×10 ^-7 (3)

According to the above formulas (2) and (3), the powder magnetic core containing the powder of the amorphous magnetic material having a median diameter D50 of 5 μm is obtained in the range of the first mixing ratio of 50% by mass to 100% by mass. The two constants k _h and k _e . Then, based on the two constants k _h and k _e obtained in this manner, a powder containing an amorphous magnetic material having a median diameter D50 of 5 μm is calculated and the first mixing ratio is in the range of 50% by mass to 100% by mass. The iron loss Pcv of the powder magnetic core (frequency f: 2 MHz, effective maximum magnetic flux density B _m : 15 mT). The results are shown in Table 2. In Table 2, the iron powder Pcv of the powder magnetic core when the first mixing ratio is 100% by mass is used, and the iron powder of the powder core is used when the first mixing ratio is 50% by mass to 90% by mass. The value obtained by normalizing the loss Pcv is taken as the iron loss ratio.

Using the measurement results of the range of the frequency of 1 MHz to 3 MHz in the measurement result of the iron loss Pcv of the loop coil of Example 8, two constants k _h and k _{e were obtained} . The results are shown in Table 3.

In the embodiment shown in Table 38 of the constant k 2 and k _H is the result _e of similarities with the results of Example 1 shown in Table 1 of the _H k 2 and k are constants _{e is} the result. Therefore, using the results of the constant k _h and the constant k _e in Example 8, Examples 2 to 6, and Example 7, the powder magnetic powder of the amorphous magnetic material having a median diameter D50 of 8 μm was used. The two constants k _h and k _{e of} the core determine the dependence on the first mixing ratio. As a result, as shown in FIG. 8, the result of fitting the dependence of the constant k _h with respect to the first mixing ratio is a formula represented by the following formula (4). The correlation coefficient of the following formula (4) is 0.9980. On the other hand, as shown in FIG. 9, the result of fitting the dependence of the constant k _e with respect to the first mixing ratio is a formula represented by the following formula (5). The correlation coefficient of the following formula (5) is 0.9843. Further, in the following formulas (4) and (5), x is the first mixing ratio (unit: mass%).

k _h =2.290×10 ^-7 x ² +4.737×10 ^-6 x-3.748×10 ^-5 (4)

k _e =2.032×10 ^-11 x ² -4.509×10 ^-10 x+2.468×10 ^-7 (5)

According to the above formulas (4) and (5), the powder magnetic core containing the powder of the amorphous magnetic material having a median diameter D50 of 8 μm is obtained in the range of the first mixing ratio of 50% by mass to 100% by mass. The two constants k _h and k _e . Then, based on the two constants k _h and k _e obtained in this manner, a powder containing an amorphous magnetic material having a median diameter D50 of 8 μm is calculated and the first mixing ratio is in the range of 50% by mass to 100% by mass. The iron loss Pcv of the powder magnetic core (frequency f: 2 MHz, effective maximum magnetic flux density B _m : 15 mT). The results and the iron loss ratios obtained in the same manner as in Table 2 are shown in Table 4.

(Test Example 2) Measurement of magnetic permeability

The toroidal coil obtained by winding the coated copper wire 40 times on the primary side and winding 10 times on the secondary side on the toroidal magnetic core produced in Examples 1 to 8, using an impedance analyzer (HP company) The manufactured "4192A") was measured at an initial permeability μ' at 100 kHz. The results are shown in Table 5. In the row of D50 in Table 5, the powder median diameter D50 of the amorphous magnetic material contained in the powder magnetic core is shown.

From the results shown in Table 5, the dependence of the initial magnetic permeability μ' of the powder magnetic core containing the powder of the amorphous magnetic material having a median diameter D50 of 5 μm with respect to the first mixing ratio was determined. As a result, as shown in FIG. 10, the fitting result of the dependence of the initial magnetic permeability μ' with respect to the first mixing ratio is a formula represented by the following formula (6). The correlation coefficient of the following formula (6) is 0.9934. Further, in the following formula (6), x is the first mixing ratio (unit: mass%).

μ'=-7.244×10 ^-4 x ² +1.529×10 ^-1 x+2.859×10 ¹ (6)

An amorphous magnetic material having a median diameter D50 of 5 μm was calculated according to the above formula (6) The powder has a powder and the first mixing ratio is in the range of 50% by mass to 100% by mass of the initial magnetic permeability μ' of the powder magnetic core. The results are shown in Table 6. In Table 6, the powder magnetic property when the initial magnetic permeability μ' of the powder magnetic core in the case where the first mixing ratio is 100% by mass is used, and the first mixing ratio is 50% by mass to 90% by mass. The value obtained by normalizing the initial magnetic permeability μ' of the core is taken as the initial permeability ratio.

It is assumed that the dependence of the initial magnetic permeability μ' of the powder magnetic core containing the powder of the amorphous magnetic material having a median diameter D50 of 8 μm with respect to the first mixing ratio is represented by a straight line, according to Examples 8 and 7. When the first mixing ratio of the powder magnetic core containing the powder of the amorphous magnetic material having a median diameter D50 of 8 μm is in the range of 50% by mass to 100% by mass, the result of the measurement of the initial magnetic permeability μ' is calculated. Initial permeability μ'. The results and the initial permeability ratios obtained in the same manner as in Table 5 are shown in Table 7.

(Test Example 3) Measurement of DC superposition characteristics

A toroidal coil formed by the toroidal cores produced by the embodiments 1 to 8 was used, and a direct current was superposed on the toroidal coil in accordance with JIS C2560-2. The applied current value Isat (unit: A) when the ratio (ΔL/L ₀ ) of the inductance L of the inductance L to the value L ₀ of the inductance L before the application of the overlap current (initial) reaches 30%, Evaluate DC overlap characteristics. The results are shown in Table 8. In the row of D50 in Table 8, the powder median diameter D50 of the amorphous magnetic material contained in the powder magnetic core is shown.

From the results shown in Table 8, the dependence of the Isat of the powder magnetic core containing the powder of the amorphous magnetic material having a median diameter D50 of 5 μm with respect to the first mixing ratio was determined. As a result, as shown in FIG. 11, the result of fitting the dependence of Isat with respect to the first mixing ratio is a formula represented by the following formula (7). The correlation coefficient of the following formula (7) is 0.9954. Further, in the following formula (7), x is the first mixing ratio (unit: mass%).

Isat=6.602×10 ^-2 x+1.149×10 ¹ (7)

According to the above formula (7), Isat containing a powder of an amorphous magnetic material having a median diameter D50 of 5 μm and having a first mixing ratio in the range of 50% by mass to 100% by mass is calculated. The results are shown in Table 9. In Table 9, it is shown that the Isat of the powder magnetic core is normalized when the first mixing ratio is 50% by mass to 90% by mass in the case where the first mixing ratio is 100% by mass. The value obtained is the Isat ratio.

It is assumed that the dependency of Isat on the powder magnetic core containing the powder of the amorphous magnetic material having a median diameter D50 of 8 μm with respect to the first mixing ratio is represented by a straight line, and the measurement results of Isat according to Examples 8 and 7 The Isat of the powder magnetic core containing the powder of the amorphous magnetic material having a median diameter D50 of 8 μm and having the first mixing ratio in the range of 50% by mass to 100% by mass was calculated. The results and the Isat ratios obtained in the same manner as in Table 9 are shown in Table 10.

Figure 12 is a graph showing the iron loss of a powder magnetic core containing a powder of an amorphous magnetic material having a median diameter D50 of 5 μm and a first mixing ratio in the range of 50% by mass to 100% by mass. Ratio, initial permeability ratio, and Isat ratio plot. As shown in Fig. 12, according to the comparison with the powder magnetic core composed of CIP (Example 7), it was confirmed that the magnetic powder contained in the powder magnetic core contains amorphous magnetic material. In the powder, the iron loss ratio, the initial permeability ratio, and the Isat ratio were both lowered, and the iron loss ratio was significantly lower than the other two ratios. This result shows that by mixing a magnetic powder containing a powder of an amorphous magnetic material into a powder magnetic core composed of a magnetic powder of CIP, the initial magnetic permeability or the decrease in Isat can be reduced, and the iron loss can be greatly reduced. Further, as is clear from Fig. 12, the larger the proportion of the magnetic powder of the powder containing the amorphous magnetic material mixed in the powder magnetic core, the more remarkable the decrease in the iron loss Pcv.

In order to confirm the degree of decrease in the iron loss Pcv and the degree of decrease in other magnetic properties What kind of relationship is evaluated by the following formula (8) and the following formula (9).

R1 _i =(1-C _i )/(1-P _i ) (8)

R2 _i =(1-C _i )/(1-I _i ) (9)

Here, C _i is an iron loss ratio when the first mixing ratio is i% by mass, and P _i is an initial magnetic permeability ratio when the first mixing ratio is i% by mass. Therefore, R1 _i is an index indicating how much the iron loss Pcv is decreased by the amount of decrease in the initial magnetic permeability μ' as a standard when the first mixing ratio is i% by mass. Further, I _i is an Isat ratio when the first mixing ratio is i% by mass. Therefore, R2 _i is an index indicating how much the iron loss Pcv is decreased by the amount of reduction of Isat as the standard when the first mixing ratio is i% by mass. The results of these calculations are shown in Table 11.

According to Table 11, it can be understood that by increasing the first mixing ratio, that is, the degree of mixing the magnetic powder containing the powder of the amorphous magnetic material into the powder magnetic core composed of the CIP is reduced, The iron loss Pcv can be reduced more effectively (reducing the influence of other magnetic properties).

[Industrial availability]

The electric ‧ electronic component using the powder magnetic core of the present invention can be preferably used as a booster circuit for a hybrid electric vehicle or the like, a reactor in a power generation and a substation, a transformer or a choke coil, and the like.

1‧‧‧Powder core (ring core)

Claims (15)

A powder magnetic core characterized in that it contains a powder of a crystalline magnetic material and a powder of an amorphous magnetic material, and the content of the powder of the crystalline magnetic material is relative to the content of the powder of the crystalline magnetic material. The mass ratio of the sum of the contents of the powder of the amorphous magnetic material, that is, the first mixing ratio is 75 mass% or more and 95 mass% or less. The powder magnetic core of claim 1, wherein the first mixing ratio is 80% by mass or more and 90% by mass or less. A powder magnetic core according to claim 1 or 2, wherein the powder of the above crystalline magnetic material comprises a material subjected to an insulation treatment. A powder magnetic core according to claim 1 or 2, wherein said crystalline magnetic material comprises a material selected from the group consisting of Fe-Si-Cr alloy, Fe-Ni alloy, Fe-Co alloy, Fe-V alloy, Fe-Al One or two or more materials selected from the group consisting of alloys, Fe-Si alloys, Fe-Si-Al alloys, carbonyl iron, and pure iron. The powder magnetic core of claim 4, wherein the crystalline magnetic material comprises carbonyl iron. The powder magnetic core according to claim 1 or 2, wherein the amorphous magnetic material comprises a group selected from the group consisting of Fe-Si-B alloys, Fe-PC alloys, and Co-Fe-Si-B alloys. One or more materials. The powder magnetic core of claim 6, wherein the amorphous magnetic material comprises an Fe-P-C alloy. The powder magnetic core according to claim 1 or 2, wherein the amorphous magnetic material has a powder median diameter D50 of 20 μm or less. The powder magnetic core according to claim 1 or 2, which comprises a binding component which binds the powder of the crystalline magnetic material and the powder of the amorphous magnetic material to other materials contained in the powder magnetic core. The powder magnetic core of claim 9, wherein the above-mentioned bonding component comprises a component based on a resin material. A method of manufacturing a powder magnetic core, characterized in that it is a method of manufacturing a powder magnetic core according to claim 10, and includes a forming step of obtaining a shaped article by a forming process, the forming process The pressure molding is performed on a mixture of the powder containing the crystalline magnetic material and the powder of the amorphous magnetic material and the binder component containing the resin material. The manufacturing method of claim 11, wherein the above-mentioned shaped article obtained by the above-described forming step is the above-mentioned powder magnetic core. The manufacturing method of claim 11, which comprises a heat treatment step of obtaining the above-described powder magnetic core by heat-treating the above-mentioned shaped article obtained by the above-described forming step. An electric ‧ electronic component comprising the powder magnetic core of claim 1 or 2, a coil, and a connection terminal connected to each end of the coil, and at least a portion of the powder magnetic core is located therethrough The connection terminal is disposed in the induced magnetic field generated by the current when the current flows through the coil. An electric ‧ electronic machine equipped with an electric ‧ electronic component as claimed in claim 14 , wherein the electrical ‧ electronic component is connected to the substrate by the connection terminal