CN107134346A - Inductance element - Google Patents

Inductance element Download PDF

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Publication number
CN107134346A
CN107134346A CN201710046918.3A CN201710046918A CN107134346A CN 107134346 A CN107134346 A CN 107134346A CN 201710046918 A CN201710046918 A CN 201710046918A CN 107134346 A CN107134346 A CN 107134346A
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China
Prior art keywords
magnaglo
inductance element
magnetic core
capacitive component
inductance
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CN201710046918.3A
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CN107134346B (en
Inventor
小岛章伸
高桥利男
片濑直孝
佐藤桂郎
佐藤桂一郎
佐藤昭
今井诚作
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Alps Alpine Co Ltd
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Alps Electric Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/255—Magnetic cores made from particles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2847—Sheets; Strips
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2847—Sheets; Strips
    • H01F2027/2857—Coil formed from wound foil conductor

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Soft Magnetic Materials (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Powder Metallurgy (AREA)
  • Insulating Of Coils (AREA)

Abstract

The present invention provides a kind of inductance element, in having the slim inductance element of coil case to the embedment of the inside of the magnetic core as press-powder formed body, by reducing the capacitive component C of equivalent circuit, can reduce the underproof disqualification rate of L peak values.It is that the inside of the magnetic core of press-powder formed body is embedded with coil case in the aggregate of Magnaglo.In sample group (i), (iii), coating of the metal system with body for forming coil case uses polyamide.Thus, it is possible to reduce capacitive component C.In addition, in sample group (i), the mixture of the Magnaglo of non-crystalline material and Fe Si Cr crystallinity Magnaglo is used as magnetic powder, thus, it is possible to improve inductance.

Description

Inductance element
Technical field
The present invention relates to the electricity that coil case is embedded in the magnetic core after the shaping of Magnaglo (magnetic particle) press-powder Sensing unit.
Background technology
Following patent document 1 records the invention on coil-embedded dust core.
In the coil-embedded dust core, the coil of the flat conductor winding for the covering that makes to be insulated is embedded in press-powder In magnetic core.Compressed-core is by any ferromagnetism metallic in Fe, Fe-Ni alloy/C, Fe-Si alloys by silicone resin, epoxy Magnaglo after the insulation coatings such as resin is formed.
Coil-embedded dust core is formed by setting coil in Magnaglo and giving pressure using powder forming machine Shape.
In the invention, the average thickness of the insulating film of the flat conductor used in coil is set to t, by magnetic powder The average grain diameter at end is set to It is short between generation winding wire thereby, it is possible to be avoided by ferromagnetism metal dust This undesirable condition of road.
Citation
Patent document 1：Japanese Unexamined Patent Publication 2003-272922 publications
Coil-embedded dust core described in patent document 1 prevents ferromagnetism metal dust to enter between winding wire, So as to prevent this short-circuit undesirable condition of generation, but only it can not eliminate coil by avoiding this short-circuit undesirable condition and enclose Compressed-core it is unqualified.
The content of the invention
The invention problem to be solved
The present invention is used to solve above-mentioned existing problem, and its object is to there is provided a kind of inductance element, it does not make magnetic characteristic The rising of capacitive component is reduced and suppresses, thus, it is possible to reduce disqualification rate.
Solution
The inductance element of the present invention has coil case in the inside embedment of the magnetic core formed by Magnaglo, it is characterised in that The average packed density of the Magnaglo in the magnetic core is more than 76%, the capacitive component of equivalent circuit for 6.5pF with Under.
In the inductance element of the present invention, the lower limit of the capacitive component is 3pF.
In the inductance element of the present invention, it is preferable that the average packed density is being set into D and the capacitive component is set During for C, the C is 0.63 × below D-44 and more than 3 (wherein, unit is pF).
Above-mentioned each condition can be realized by forming the insulating cover of the coil case by polyimide resin.
In addition, in the inductance element of the present invention, it is preferable that the average packed density is more than 79%, the electric capacity into It is divided into more than 4.5pF.
In above-mentioned inductance element, it is preferable that the average packed density is being set into D and the capacitive component is set to During C, the C is 0.63 × below D-44 and more than 4.5 (wherein, unit is pF).
In addition, in the inductance element of the present invention, it is preferable that obtained with L/DCR value divided by according to the profile of the magnetic core Volume V (mm3) obtained from value be L/ (DCRV) be 0.004 (μ H/m Ω mm3) more than, the value of the L/DCR is according to electricity What the inductance composition L (μ H) of sensing unit and the DC resistance DCR (m Ω) of the coil case were obtained.
The inductance element can be contained by the Magnaglo amorphous Magnaglo and crystallinity Magnaglo this two Person realizes.
In the inductance element of the present invention, it is preferable that the ratio of the amorphous Magnaglo in the Magnaglo is 50 More than weight %.
In addition, in the inductance element of the present invention, it is preferable that the relative dielectric constant ε of the magnetic core is less than 120.
In the inductance element of the present invention, the magnetic core is press-powder shaped cores.
Invention effect
The present invention be on the basis of coil case is embedded in the inductance element of magnetic core, be conceived to can by suppress electric capacity into Point rising complete reducing disqualification rate.The present invention suppresses the upper of capacitive component by using reducing magnetic characteristic The structure risen, can reduce disqualification rate.
Especially the present invention is by the material of the insulating cover for improving coil case and improves the composition of Magnaglo, thus The structure for reducing magnetic characteristic and suppressing the rising of capacitive component can be realized.
Brief description of the drawings
Fig. 1 is the stereogram for the inductance element that bottom surface is shown to embodiments of the present invention upward.
Fig. 2 is the partial sectional view that the inductance element shown in Fig. 1 is splitted with II-II lines and shows bottom surface downwards.
Fig. 3 is the side view for showing to carry out magnetic core the process of press-powder shaping.
Fig. 4 is with the sectional view of the coil cases splitted of the IV-IV shown in Fig. 1.
Fig. 5 is the equivalent circuit diagram of inductance element.
Fig. 6 is the explanation figure of the relation between the capacitive component and disqualification rate of the equivalent circuit for showing inductance element.
In Fig. 7, (A) is the line chart of the preferred condition for the characteristic for showing inductance element, when (B) shows to occur unqualified The explanation figure of characteristic.
Fig. 8 is the explanation figure for showing the relation between the average fill rate of Magnaglo and the capacitive component of equivalent circuit.
Fig. 9 is the explanation figure for showing the relation between the average fill rate of Magnaglo and inductance/coil DCR.
Figure 10 is the explanation figure for showing the relation between the average fill rate of Magnaglo and relative dielectric constant.
Description of reference numerals：
1 inductance element；
10 coil cases；
11 metal systems band body；
13 first ends；
15 first end sub-portions；
16 the second ends；
18 Second terminal portions；
20 magnetic cores；
30 stamping machines；
32 times moulds；
Mould on 33；
34 die cavities；
O winding center lines.
Embodiment
<The structure of inductance element 1>
The inductance element 1 of embodiments of the present invention shown in Fig. 1 as press-powder formed body magnetic core 20 be press-powder into Embedment has coil case 10 in shape magnetic core.
As shown in figure 1, coil case 10 is formed by coiled metal system band body 11.As shown in figure 4, metal system is with body 11 Section shape is the rectangle that the size A of width is more than the size B of thickness direction.
Metal system is formed with body 11 by the alloy of copper or cupric, and coating is formed with surface of the metal system with body 11 12.Coating 12 is formed by polyimide resin.The thickness of coating 12 is more than 3 μm and less than 7 μm.
Fig. 1 shows the winding center line O of coil case 10.Coil case 10 is in plate face of the metal system with body 11 and winding center line Wound in O generally perpendicular directions in the way of plate face is overlapped one another along winding center line O.In Fig. 1, metal system band body 11 Ellipse is wound as around center line O, but it is also possible to circle shape is wound as around center line O.
As shown in figure 1, in the state of coil case 10 is wound as ellipticity, first end 13 of the metal system with body 11 and Two ends 16 are protruded from coil case 10.Here, end 13,16 refers to, metal system in body 11 with not being wound as coil case 10 Two end portions.
First end 13 is bent by multiple broken lines, and first end sub-portion 15 is formed with its leading section.As shown in Fig. 2 First end sub-portion 15 and constitute plate face of the metal system with body 11 of coil case 10 H separated by a distance on center line O bearing of trend And it is opposed.The second end 16 is bent also by multiple broken lines, and Second terminal portion 18 is formed with its leading section.Second terminal portion 18 and constitute coil case 10 plate face of the metal system with body 11 also on center line O bearing of trend separated by a distance H and it is opposed.
Fig. 3 shows the process for making magnetic core 20 be configured to press-powder formed body (press-powder shaped cores).
Stamping machine 30 shown in Fig. 3 is provided with lower mould 32 in the inside of metal pattern main body 31, and die cavity 34 is formed with above it. Coil case 10 is inserted into the plate face of the inside of die cavity 34, the plate face in the outside of first end sub-portion 15 and the outside in Second terminal portion 18 To be positioned in the way of being connected to the upper surface of lower mould 32.
Then, after the core material being made up of Magnaglo and adhesive resin is supplied to the inside of die cavity 34, from type The upper mould 33 of top insertion of chamber 34, is pressurizeed using lower mould 32 and upper mould 33 with plus-pressure F to core material, so as to form work For the magnetic core 20 of press-powder formed body.In the press-powder forming process, adhesive resin is as mutual for combining Magnaglo Bonding agent and function.At this time it is also possible to as needed and heating cavity 34.
As shown in figure 1, being with upper surface 21 (in Fig. 1 down) and lower surface 22 as the magnetic core 20 of press-powder formed body (in Fig. 1 upward) and with the cubic shaped of four sides 23.As shown in Fig. 2 by the metal extended from coil case 10 The first end sub-portion 15 and Second terminal portion 18 for making the formation of the end 13,16 with body 11 are exposed in the lower surface 22 of magnetic core 20, respectively Plate face on the outside of the direction of individual portion of terminal 15,18 turns into the face roughly the same with the lower surface 22 of magnetic core 20.
As shown in figure 3, in die cavity 34, between lower mould 32 and upper mould 33, being made up of Magnaglo and adhesive resin Core material by with plus-pressure F pressurize, at the same time, coil case 10 and first end sub-portion 15 and Second terminal portion 18 also by It is pressurized to plus-pressure F.
After magnetic core 20 is shaped by press-powder, annealing is moved to.The annealing is heated to 300 DEG C~500 DEG C degree Temperature and carry out, be internal modification for relaxing magnetic core 20 and reduce magnetostrictive process.
As shown in Fig. 2 after an annealing treatment, the whole region coating protection resin bed 41 in the outer surface of magnetic core 20. The part existed in first end sub-portion 15 and Second terminal portion 18, removes a part for the protection resin bed 41, in addition, removing By the coating 12 of the plate face covering on the outside of first end sub-portion 15 and the direction in Second terminal portion 18, so as to form exposed division 41a.Moreover, in the surface coating electroconductive resin such as silver paste of protection resin bed 41, formed thereon by electroplating processes by The low resistance metal layer of the compositions such as gold, so as to form terminal conducting portion 42.Terminal conducting portion 42 is formed as being covered each by first end Sub-portion 15 and Second terminal portion 18.
The Magnaglo that the core material of composition magnetic core 20 is included is magnetic alloy powder (magnetic alloy particle).Magnetic Powder (magnetic particle) is the based amorphous alloys of Fe based on Fe and containing the various metals such as Ni, Sn, Cr, P, C, B, Si The powder (amorphous Magnaglo) of (non-crystaline amorphous metal), uses the Magnaglo after the powdered by water atomization.Or, magnetic Powder uses the powder (amorphous Magnaglo) and crystallinity Magnaglo (crystallinity clipped wire of the based amorphous alloys of the Fe Son) mixture.The inductance composition L of magnetic core 20 is set to it is higher in the case of, as Magnaglo, preferably use Fe bases The powder (amorphous Magnaglo) and the mixture of crystallinity Magnaglo of amorphous alloy.
Crystallinity Magnaglo is Fe or Fe-Si alloys or Fe-Si-Cr alloys etc., using by water atomization or The Magnaglo of other method formation.
Magnaglo preferably comprise more than 50 mass % and below the 90 mass % based amorphous alloys of Fe powder, it is more excellent Powder of the choosing comprising more than 60 mass % and below the 80 mass % based amorphous alloys of Fe.As described above, Magnaglo also may be used Only to be formed by the powder of the based amorphous alloys of Fe, thus in Magnaglo, the containing ratio of the powder of the based amorphous alloys of Fe Preferably more than 50 mass %, more preferably more than 60 mass %.
Adhesive resin contained by the core material is silicone resin, epoxy resin etc..As the core material, make With the Magnaglo by the material after described adhesive resinous coat.Or, it will can also only be mixed with Magnaglo and powder The material of the adhesive resin of last shape is used as core material.
<The characteristic of inductance element 1>
(1) relation between the capacitive component C and disqualification rate in equivalent circuit
Fig. 5 shows the equivalent circuit of inductance element 1.Equivalent circuit have inductance composition L, capacitive component C and resistance into Divide R.Fig. 7 (A) shows the characteristic of the inductance element 1 of normal condition, and Fig. 7 (B) shows to produce underproof inductance element 1 Characteristic.In Fig. 7 (A), (B), transverse axis represents frequency, and the longitudinal axis in left side represents inductance composition L, and the longitudinal axis on right side is represented Q values.
The value of inductance when in this manual, the value of the inductance of the positive side in resonant frequency is set into Lp, by 1MHz When being set to Ls, it is judged as unqualified (L peak values are unqualified) when Lp/Ls is less than 1.1.In (A), the example of (B) in Fig. 7, Resonant frequency is about 1.9 × 107Hz, in Fig. 7 (A), Lp/Ls is 5 or so, on the other hand, in Fig. 7 (B), Lp/ Ls turns into the value small more than 1.1.
Fig. 6 shows the relation between the capacitive component C (pH) in the equivalent circuit of inductance element 1 and L peak value disqualification rates. In inductance L f (frequency) characteristic curve, when the frequency of (Lp) when the value of inductance is turned into peak value is set to fp, by following Formula obtains the capacitive component C in equivalent circuit.
Fp=1/ { 2 π √ (LsC) }
Here, inductance value when Ls is 1MHz, C is capacitive component.Therefore, the electric capacity penetrated in circuit of inductance element 1 Composition is obtained by following formula.
C=1/ { (2 π fp)2·Ls}
The Magnaglo for constituting magnetic core 20 is Magnaglo (the Fe bases of the non-crystalline material of the Fe bases produced by water atomization The powder of amorphous alloy) it is that 70 mass %, the Fe-Si-Cr produced by water atomization crystallinity Magnaglo are 30 matter Measure % mixture.The average particulate diameter of the Magnaglo of the non-crystalline material of Fe bases is more than 5 μm and less than 7 μm, Fe-Si- The average particulate diameter of Cr crystallinity Magnaglo is 4 μm.In following shown inductance elements 1, the amorphous magnetic of Fe bases Powder is made up of the amorphous magnetic alloy of the Fe-P-C systems represented with following composition formulas.
Fe100 atom %-a-b-c-x-y-z-tNiaSnbCrcPxCyBzSit
Here, it is former to enumerate the atom % of the atom % of 0 atom %≤a≤10,0 atom %≤b≤3,0 atom %≤c≤6 It is the atom % of the atom % of the atom % of sub- %, 6.8 atom %≤x≤13,2.2 atom %≤y≤13,0 atom %≤z≤9,0 former The atom % of sub- %≤t≤7 Fe base amorphous alloys.In above-mentioned composition formula, Ni, Sn, Cr, B and Si are any addition Element.Specifically, using with Fe71.4Ni6Cr2P10.8C7.8B2Composition Fe base amorphous alloys.But, in the present invention In, the non-crystalline material of Fe bases is not limited to the non-crystalline material of Fe-P-C systems, can also use the non-crystalline material of Fe-Si-B systems.
The appearance and size of magnetic core 20 is set to about 2.5mm × 2.0mm × 0.8mm or about 2.5mm × 2.0mm × 1.0mm, The packed density of Magnaglo is changed, or the amount of adhesive resin is changed, so as to manufacture a variety of (many batches It is secondary) magnetic core that changes the capacitive component C of equivalent circuit.Sample (the sample of each batch of the mutually isostructural inductance element 1 of manufacture This) each 3000, for each inductance element of 3000 inductance elements of identical structure (identical batch), obtain Fig. 7 institutes The inductance characteristic and the characteristic of Q values shown, and Lp/Ls is obtained as less than the 1.1 underproof disqualification rate of L peak values.
The mark of blacking shown in Fig. 6 shows the L peak value disqualification rates for each batch that sample is 3000.
Fig. 6 shows the situation that capacitive component C is smaller, L peak value disqualification rates are smaller of equivalent circuit.The following institute of its reason State.
On the electric current circulated from the first end sub-portion 15 of the inductance element 1 shown in Fig. 1 to Second terminal portion 18, in ideal Product in, all electric currents are circulated to Second terminal portion 18 from first end sub-portion 15.Therefore Q values will not be reduced.On the other hand Ground, the static capacity between the first end sub-portion 15 shown in Fig. 1 and Second terminal portion 18 and the coil case 10 shown in Fig. 5 With direct capacitance quantitative change in each portion of terminal 15, the distance between 18 H it is big when, when using inductance element 1 near resonant frequency, resistance Anti- reduction, the circulation loss of electric current is produced and Q values are reduced.
In this regard, in the present invention, by suppressing capacitive component C increase, the circulation loss of electric current can be suppressed, suppress Q The deterioration of value and to reduce or eliminate L peak values unqualified.According to Fig. 6, capacitive component C is preferably below 6.5pF.Especially electric capacity into When dividing C for below 5.8pF, as shown in fig. 6, L peak value disqualification rates are almost nil, therefore it is more highly preferred to.
(2) relation between the characteristic of the filling rate of Magnaglo and inductance element 1
Fig. 8 is shown between the capacitive component C in the filling rate (area %) and equivalent circuit of the Magnaglo in magnetic core 20 Relation.On filling rate, after cut-out formed body 20, multiple SEM photographs are shot, metallic magnetic is determined among each image Property body part and the area ratio of part in addition, the average proportions that metal magnetic body is occupied in overall area Calculated as filling rate.In fig. 8, a variety of inductance elements 1 that will change the filling rate of Magnaglo are used as sample.In electricity All 2.5mm × the 2.0mm of size × 1.0mm of the magnetic core 20 used in sensing unit 1.
In fig. 8, the sample group (i) drawn by the mark of triangle and the sample group (ii) drawn by the mark of quadrangle In, the Magnaglo for having used the non-crystalline material of the Fe-P-C systems produced by water atomization is 70 mass % and passed through The crystallinity Magnaglo for the Fe-Si-Cr that water atomization is produced is used as to form magnetic core 20 for 30 mass % mixture Magnetic powder.The average particulate diameter of the Magnaglo of the non-crystalline material of Fe-P-C systems is 7 μm, Fe-Si-Cr crystallinity magnetic powder The average particulate diameter at end is 4 μm.
In the inductance element 1 of sample group (i), surface of the metal system with body 11 of the coil case 10 shown in pie graph 4 Coating 12 is formed by polyimide resin.On the other hand, in the inductance element 1 of sample group (ii), metal system is with body 11 Coating 12 is formed by polyamide-imide resin.
In sample group (i) and sample group (ii), although the structure for constituting the magnetic powder of magnetic core 20 is roughly the same, with When on the basis of the filling rate of magnetic powder, the capacitive component C of sample group (i) value is less than the capacitive component C of sample group (ii) value. Because, coating 12 of the metal system with the body 11 i.e. polyimides tree of the composition coil case 10 used in sample group (i) The polyamide-imide resin of fat and the coating 12 used in sample group (ii) is in a ratio of hard, therefore is passing through press-powder Forming process is manufactured during magnetic core 20, and magnetic powder is difficult to invade coating 12, ensures that the metal band for constituting coil case 10 Body 11 and the distance of magnetic powder.
In the sample group (iii) drawn in fig. 8 by the mark of circle and the sample group (iv) drawn by the mark of rhombus, The Magnaglo of the non-crystalline material for the Fe-P-C systems that the magnetic powder of formation magnetic core 20 is produced only by water atomization is constituted. The average particulate diameter of the Magnaglo of the non-crystalline material of Fe-P-C systems is 5 μm.
In the inductance element 1 of sample group (iii), the coating 12 on surface of the metal system with body 11 of coil case 10 is constituted Formed by polyimide resin, in the inductance element 1 of sample group (iv), coating 12 of the metal system with body 11 by polyamide- Imide resin is formed.
Here, in sample group (iii) and sample group (iv), although constituting the structure substantially phase of the magnetic powder of magnetic core 20 Together, but when on the basis of the filling rate by magnetic powder, the capacitive component C of sample group (iii) value is less than the electricity of sample group (iv) Rongcheng point C value.
Fig. 9 shows the relation between the average fill rate (volume %) of the magnetic powder in magnetic core 20 and inductance/coil DCR. The inductance of the longitudinal axis/coil DCR is the DC resistance of inductance composition L in the equivalent circuit of inductance element 1 divided by coil case 10 (DCR) it is worth obtained from, unit is (μ H/m Ω).
As shown in figure 9, showing using the magnetic of the non-crystalline material of Fe-P-C systems as the magnetic powder for forming magnetic core 20 In the sample group (i) of the mixture of property powder and Fe-Si-Cr crystallinity Magnaglo, (ii), relative to the magnetic of magnetic core 20 The structure that powder is only made up of the Magnaglo of the non-crystalline material of Fe-P-C systems, inductance composition L is uprised.
Because, Fe-Si-Cr crystallinity Magnaglo and the non-crystalline material of Fe-P-C systems be in a ratio of it is soft, therefore When the magnetic core 20 of press-powder formed body is pressurized shaping, Fe-Si-Cr crystallinity Magnaglo is easily extruded.As a result, In the sample group (i) containing crystallinity Magnaglo, (ii), the filling rate of magnetic powder can be made higher.Forming magnetic core When 20, the non-crystalline material powder (the non-crystalline material powder of Fe bases) and Fe-Si-Cr of Fe-P-C systems are mixed with due to that can improve The filling rate of the magnetic powder of crystallinity Magnaglo, therefore, it is possible to obtain high inductance and inductance/coil DCR.
According to Fig. 8 and Fig. 9, coating of the metal system with body 11 that constitutes coil case 10 is being formd by polyimide resin In 12 sample group (i), (iii), the capacitive component C of equivalent circuit can be set in the low of below 6.5pF and more than 3.0pF In the range of.As shown in fig. 6, the low value by the way that capacitive component C to be set as to below 6.5pF, can set L peak values disqualification rate In scope below 0.1%.But, according to Fig. 6, in order that L peak value disqualification rates are almost 0%, more preferably by electric capacity into C is divided to be set as below 5.8pF.In addition, according to Fig. 8, in sample group (i), (iii), Magnaglo in magnetic core 20 is averaged Filling rate is more than 76 (volume %).
Fig. 8 show the low sample groups (i) of capacitive component C, (iii) and sample group (ii) bigger than them capacitive component C, (iv) boundary line (b) between.Know when the filling rate of inductance element 1 is uprised, the capacitive component C of equivalent circuit is in become big Trend.On the other hand, sample group (i), (iii) and sample group (ii), (iv) are vertically separated by boundary line (b) is clear, at this In invention, by suitably selecting the coating 12 of Magnaglo and coil case 10, boundary line (b) can be turned into below.It will put down When equal material filling rate (average packed density) is set to D, the equation of the straight line of the boundary line (b) is C=0.63 × D-44.Cause And, the capacitive component C of the equivalent circuit of inductance element 1 is preferably 0.63 × below D-44 and more than 3.0 (unit is pF).
As shown in figure 9, even capacitive component C can also tie up inductance composition L than relatively low sample group (i), (iii) Hold as relatively higher value.In sample group (i), (iii), inductance/coil DCR is more than 0.01 μ H/m Ω.Sample group (i), (iii) in, the appearance and size of the magnetic core 20 of inductance element is 2.5mm × 2.0mm × 1.0mm, and volume V is 5mm3.Thus, Value with inductance/coil DCR is that value, i.e. L/ (DCRV) obtained from L/DCR divided by volume V is 0.002 (μ H/m Ω mm3) More than.
That is, can by making coating 12 of the metal system of composition coil case 10 with body 11 be made up of polyimide resin Reduce capacitive component C and reduce L peak value disqualification rates, but in this case, also L/ (DCRV) can be maintained comparison high Value, it can be ensured that be used as the magnetic characteristic of inductance element 1.
It should be noted that it is higher in order to which inductance/coil DCR is set to, preferably use the inductance element of sample group (i) 1.In sample group (i), according to Fig. 8, capacitive component C is more than 4.5pF and below 6.5pF.In addition, being averaged for Magnaglo is filled out It is more than 79% to fill density.
According to Fig. 9, in the inductance element 1 of sample group (i), it is more than 0.02 μ H/m Ω that can make inductance/coil DCR. In this case, value, i.e. L/ (DCRV) obtained from being L/DCR divided by volume V with inductance/coil DCR turns into 0.004 (μ H/m Ω·mm3) more than.
From Fig. 8 and Fig. 9, as sample group (i), (iii), by forming coil case 10 by polyimide resin Coating 12 of the metal system with body 11, can reduce the capacitive component C of the equivalent circuit of inductance element 1, so as to reduce shown in Fig. 6 The underproof disqualification rate of L peak values.In addition, as sample group (i), by using the non-crystalline material of Fe bases, particularly Fe- The mixture of the Magnaglo of the non-crystalline material of P-C systems and Fe-Si-Cr crystallinity Magnaglo is used as to form magnetic core 20 Magnaglo, can make inductance composition L larger, can further improve the magnetic characteristic of inductance element 1.
Next, Figure 10 shows the relation between the average fill rate and relative dielectric constant of the Magnaglo of magnetic core 20. Sample group (v) is identical with shown in Fig. 8 and Fig. 9, and only the non-crystalline material by particle diameter for 5 μm of Fe-P-C systems constitutes magnetic powder End.
In sample group (vi), as Magnaglo, the Magnaglo and Fe-Si- of the non-crystalline material of Fe-P-C systems have been used The mixture of Cr crystallinity Magnaglo.Amorphous Magnaglo contains 70 mass % and particle diameter is 5 μm.Fe-Si-Cr's The particle diameter of crystallinity Magnaglo is 4 μm.
In sample group (vii), as Magnaglo, the Magnaglo and Fe-Si- of the non-crystalline material of Fe-P-C systems have been used The mixture of Cr crystallinity Magnaglo.Amorphous Magnaglo contains 70 mass % and particle diameter is 6.5 μm.Fe-Si-Cr Crystallinity Magnaglo particle diameter be 4 μm.
In sample group (viii), as Magnaglo, the Magnaglo and Fe- of the non-crystalline material of Fe-P-C systems have been used The mixture of Si-Cr crystallinity Magnaglo.Amorphous Magnaglo contains 70 mass % and particle diameter is 7 μm.Fe-Si- The particle diameter of Cr crystallinity Magnaglo is 4 μm.It is less than 120 that relative dielectric constant, which can be made,.
As shown in Figure 10, when improving material filling rate, relative dielectric constant is in the trend uprised.In fig. 8, in material When filling rate is improved, capacitive component C is also in the trend uprised, and this is caused by relative dielectric constant is improved.However, in this hair In bright, by the way that relative dielectric constant is suppressed below 120, capacitive component C can be made to meet below 6.5pF and more than 3.0pF Low value.

Claims (11)

1. a kind of inductance element, has coil case in the inside embedment of the magnetic core formed by Magnaglo, it is characterised in that
The average packed density of the Magnaglo in the magnetic core is more than 76%, and the capacitive component of equivalent circuit is 6.5pF it is following.
2. inductance element according to claim 1, it is characterised in that
The capacitive component is more than 3pF.
3. inductance element according to claim 2, it is characterised in that
When the average packed density is set into D and the capacitive component is set into C,
The C be 0.63 × below D-44 and more than 3, wherein, unit is pF.
4. inductance element according to any one of claim 1 to 3, it is characterised in that
The insulating cover of the coil case is formed by polyimide resin.
5. inductance element according to claim 1, it is characterised in that
The average packed density is more than 79%, and the capacitive component is more than 4.5pF.
6. inductance element according to claim 5, it is characterised in that
When the average packed density is set into D and the capacitive component is set into C,
The C be 0.63 × below D-44 and more than 4.5, wherein, unit is pF.
7. the inductance element according to claim 5 or 6, it is characterised in that
Volume V (the mm obtained with L/DCR value divided by according to the profile of the magnetic core3) obtained from value, i.e. L/ (DCRV) be 0.004(μH/mΩ·mm3) more than, the value of the L/DCR is according to the inductance composition L (μ H) of inductance element and the coil case DC resistance DCR (m Ω) is obtained.
8. the inductance element according to claim 5 or 6, it is characterised in that
The Magnaglo includes both amorphous Magnaglo and crystallinity Magnaglo.
9. inductance element according to claim 8, it is characterised in that
The ratio of the amorphous Magnaglo in the Magnaglo is more than 50 weight %.
10. inductance element according to any one of claim 1 to 3, it is characterised in that
The relative dielectric constant ε of the magnetic core is less than 120.
11. inductance element according to any one of claim 1 to 3, it is characterised in that
The magnetic core is press-powder shaped cores.
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