CN105390226A - A core and a coil device using the core - Google Patents
A core and a coil device using the core Download PDFInfo
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- CN105390226A CN105390226A CN201510553888.6A CN201510553888A CN105390226A CN 105390226 A CN105390226 A CN 105390226A CN 201510553888 A CN201510553888 A CN 201510553888A CN 105390226 A CN105390226 A CN 105390226A
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Abstract
The invention provides a core and a coil device using the core which can increase an inductance and more specifically increase the inductance per unit weight and suppress heating due to core losses through implement shape improvement. The core (10) related to the invention is a closed magnetic circuit having a core main body formed by carrying out pressure molding on metal powder with magnetic materials or subjecting oxidized magnetic materials to pressure welding or sintering. The core main body has an abnormal-shaped portion (40). The surface area (S1) of the inner circumferential side of the abnormal-shaped portion (40) is larger than the surface area (S2) of the outer circumferential side, when a profile from the inner circumference to the outer circumference in a width direction is cut by intermediate lines (M) of the inner circumference and the outer circumference. Preferably, the profile of the abnormal-shaped portion enables the largest height closer to the inner circumference side than the intermediate line to be larger than the largest height of the outer circumference side.
Description
Technical field
The core (core) that the coil device that the present invention relates to equipment in the rectification circuit in the alternating current equipment such as power circuit, inverter, protection against noise circuit, waveform shaping circuit, resonant circuit, various switching circuits etc. uses and the coil device using this core.
Background technology
Be equipped on the coil device of the circuit of various alternating current equipment, at the core winding coil and forming of ring-type.As core, the ferrite core will sintered after the so-called press-powder core of metal-powder press molding or pressure oxidation magnetic material as magnetic material is proposed.And, across the insulant such as bobbin or resin-coating, coiling is implemented to core, form coil device.
Such as, Patent Document 1 discloses pair cross-section is that the coil device of coiling implemented by the core of rectangle, improves exchange permeability or by the inductance value shown in direct current overlapping features and reduce for the purpose of core loss etc. by the improvement by implementing material.
Patent documentation 1: Japanese Unexamined Patent Publication 2003-249410 publication.
Summary of the invention
Inventors performed research, seeking with the improvement by implementing shape the inductance value, the reduction core loss that improve coil device.And the result studied with keen determination, is conceived to following situation, that is, the core of the ring-type core that particularly permeability is low, flux concentrating is in the short inner circumferential side of magnetic circuit, and magnetic flux density along with towards outer circumferential side step-down, thus completes the present invention.
The object of this invention is to provide and can improve inductance value, the inductance value that more specifically improves Unit Weight, reduce the core of the shape of core loss and use the coil device of this core.
Core involved in the present invention, it is a kind of closed magnetic circuit core with the core main body of metal-powder being carried out press molding as magnetic material or sintered by oxide based magnetic material press molding, wherein, described core main body has special-shaped portion, if divide the section of the Width from inner circumferential towards periphery with the mid line of inner periphery and the outer periphery, then the area of the inner circumferential side in described special-shaped portion is greater than the area of outer circumferential side.
The described section in described special-shaped portion preferably makes maximum height than described mid line inner circumferential side side higher than the maximum height of outer circumferential side.
The center of gravity of the described section in described special-shaped portion is preferably made to be positioned at inner circumferential side relative to described mid line.
The described section in described special-shaped portion preferably implements chamfering to the short transverse two edges of outer circumferential side.
The described section in described special-shaped portion preferably implements the chamfering amount chamfering less than the chamfering of the short transverse two edges of described outer circumferential side to the short transverse two edges of inner circumferential side.
The best magnetic permeability mu of described core is 200(CGS system of units: following identical) below.
Described special-shaped portion can as the whole surrounding of described core main body.
In addition, described special-shaped portion also can be located at a part for described core main body.
And described special-shaped portion at least can be located at the part of winding coil.
In addition, coil device involved in the present invention carries out insulating wrapped to above-mentioned core and at least forms the part winding coil in special-shaped portion.
According to core involved in the present invention, the special-shaped portion of core main body makes the outer circumferential side that the area ratio magnetic flux of the inner circumferential side that magnetic flux is many is few large in section, thus do not change core sectional area and in-core footpath and effective magnetic circuit length can be shortened, therefore, it is possible to seek the inductance value of the Unit Weight improving core, and then suppress the rising of the magnetic flux density of inner circumferential side and seek the homogenizing of the magnetic flux density in cross section, therefore also can seek to reduce core loss.
Accompanying drawing explanation
Fig. 1 is the stereogram of the core involved by an embodiment of the invention.
Fig. 2 is the plane graph of the core of Fig. 1.
Fig. 3 is the sectional view cut off along the line A-A ' of Fig. 2.
Fig. 4 is the plane graph of the core involved by other execution modes of the present invention.
Fig. 5 is the sectional view blocked along the line A-A ' of Fig. 4.
Fig. 6 is the stereogram of the coil device involved by an embodiment of the invention, the stereogram that Fig. 6 (a) is example, Fig. 6 (b) is comparative example.
Fig. 7 is the key diagram of the distribution illustrated magnetic flux during coil electricity, the key diagram that Fig. 7 (a) is example, Fig. 7 (b) is comparative example.
Fig. 8 is the stereogram of the core involved by other execution modes of the present invention.
Fig. 9 is the stereogram of the core involved by other execution modes of the present invention.
Figure 10 is the stereogram of the core involved by other execution modes of the present invention.
Figure 11 is the sectional view of the core of coil device for embodiment, the core that Figure 11 (a) is example, Figure 11 (b) is comparative example.
Figure 12 is the chart of the DC overlapping features that example and comparative example are shown.
Embodiment
Below, with reference to accompanying drawing, to the core 10 involved by an embodiment of the invention and use its coil device 20 to be described.Core 10 of the present invention can be used in the such coil device of such as choking-winding or reactor 20.
Fig. 1 is the core 10(core main body involved by an embodiment of the invention) stereoscopic figure, Fig. 2 is plane graph, and Fig. 3 is the sectional view of the line A-A ' along Fig. 2.
Core 10(core main body involved in the present invention) by carrying out press molding to powder magnetic material or sintering after pressurizeing and formed.Core (hereinafter referred to as " the press-powder core ") that obtain at press molding, as magnetic material, iron class, iron-silicon class, iron-aluminium-silicon class (so-called sendust), iron-nickel class (so-called permalloy), Ni-Fe-molybdenum class, iron class non-crystalline material can be illustrated.The powder most cases of magnetic material uses the resins such as silicon class, propylene class, phenolic as adhesive and mixes with powder, heats powder surface insulation or implemented by chemical treatment to form the process being oxidized overlay film while of further in order to reduce the object of core loss.In addition, core (hereinafter referred to as " the sintering core ") that sinter after press molding, Mn-Zn class ferrite core, Ni-Zn class ferrite core material etc. can be illustrated.
Among above-mentioned magnetic material, iron-aluminium-silicon class (sendust) or iron-Si class, iron class non-crystalline material, because hardness is high, so be difficult to the powder crushing magnetic material when being shaped, have the advantage of the vortex flow loss that can reduce the core 10 made.In addition, these materials are also cheap than iron-nickel class (permalloy).
Among above-mentioned core 10, the present invention is particularly suitable for the low press-powder core of magnetic permeability mu.The magnetic permeability mu of press-powder core is about 40 ~ 200, and the magnetic permeability mu of sintering core is about 2000 ~ 7000.Reason is aftermentioned.
Core 10 is formed with ring-type as shown in Figure 1.Illustrated execution mode is form in central authorities the circular closed magnetic circuit (so-called toroidal cores) that the inner circumferential in fenestrate portion 12 and periphery formed with circle.In addition, core 10 is not limited to circular, also can be oval ring-type, rectangular ring, other polygonal ring shape, contact two roughly orthogonal line parts dactyoideus ring-type closed magnetic circuit each other in addition, by annulus.And then core 10 also can be the multiple core of combination (block) and forms the core of the above-mentioned shape of closed magnetic circuit.About these, as variation, Fig. 8 to Figure 10 is utilized to be described later.
The present invention is preferably applicable to the ratio of internal diameter and external diameter or inner circumferential side girth is the core 10 of 1:1.5 ~ 1:2.0 with the ratio of outer circumferential side girth.And, be preferably applicable to the core 10 that external diameter is 20mm ~ 50mm.About its reason subsequent descriptions.The core 10 of the external diameter departing from above-mentioned scope can certainly be applicable to.
Core 10 can be shaped as gap as required, backfill the shape in the gap formed.Such as, when inserting the air core coil of coiling in advance to core 10, form the space for inserting air core coil at core 10, after this air core coil of insertion, can as required with the backfill such as magnetic material, nonmagnetic material structure space.
In addition, core 10 is preferably integrally formed, but as shown in variation (Fig. 8 to Figure 10), also can be formed by the block 42,42 of multiple segmentation.Segmentation direction can suitably be selected parallel with Width, vertical with short transverse etc.
In order to ensure the electrical insulating property with coil 30, core 10 is carried out insulating wrapped.Such as, insulating wrapped can be implemented in the following way: to reel the sheet of insulating properties or band to core 10; Or prepare shell with the resin of insulating properties and receive core 10; Or be set into core 10 with the resin of same dielectric; Or by resin powder coating engineering method or smear the coated core 10 of engineering method insulative resin.
As shown in Figure 1 to Figure 3, core 10 involved in the present invention has feature at its cross sectional shape.More specifically, as shown in Figure 3, core 10 has special-shaped portion 40, its shape is when carrying out cross section from the side, window portion 12 of the inner side being formed in inner circumferential, i.e. core 10 towards the Width of periphery, if divide section with the mid line M of inner circumferential I and periphery O, then the area S1 of inner circumferential side is also larger than the area S2 of outer circumferential side.Illustrated special-shaped portion 40 is throughout core 10(core main body) wholely around to be formed.In addition, Width refers to orthogonal relative to the inner peripheral surface of core 10 or roughly orthogonal face.That is, the Width when core 10 is circular refers to radial direction, and the direction orthogonal relative to the inner peripheral surface of this line part when having line part is Width.In addition, when core 10 has local buckling or the different pars convoluta of radius of curvature, the face orthogonal or roughly orthogonal relative to its tangential direction is referred to.
The special-shaped portion 40 of core 10 preferably makes the area S1 of the inner circumferential side in its section be 1.1:1 ~ 1.50:1 with the ratio of the area S2 of outer circumferential side, is more preferably 1.15:1 ~ 1.37:1.
As mentioned above, the area S2 of special-shaped portion 40 in order to make the area S1 of the inner circumferential side of core 10 be greater than outer circumferential side, can implement chamfering to the short transverse two edges of the outer circumferential side of core 10.As chamfering, as shown in fig. 3 in cross section, the large radius (R) 14 of radius of curvature can be formed in the bight of the outer circumferential side of core 10, or form straight line or curvilinear taper 16 at outer circumferential side as shown in Figures 4 and 5.In addition, about core 10, be positioned to make maximum height Hmax and formed relative to the mode of mid line M more inner circumferential side side, or also can to make the average height of inner circumferential side be formed higher than the mode of the average height of outer circumferential side.And the mode being positioned at inner circumferential side with the center of gravity G in the cross section making core 10 is formed also can.In addition, in the core 10 of Fig. 3, the area S1 of the inner circumferential side in the section in special-shaped portion 40 is 1.15:1 with the ratio of the area S2 of outer circumferential side.
In Fig. 3 and Fig. 5, also chamfering is implemented to short transverse two edges at the inner peripheral surface of core 10.In addition, the chamfering amount of the short transverse two edges of inner circumferential side is less than the chamfering amount of the short transverse two edges of outer circumferential side.More specifically, in figure 3, the inner circumferential side of core 10 forms the radius of curvature radius 18 less than the radius 14 of outer circumferential side in the two edges of short transverse.This is because when manual coiling or machinery winding coil 30 described later, improve the winding easness of coil 30, alleviate the stress to coil-conductor insulating coating, and improve the adaptation of coil 30 and core 10, shorten the winding length relative to the number of turn of coil 30, thus suppress the D.C. resistance of coil 30.Particularly when manual coiling, because of the qualification of operator there is very large deviation in DC resistance, but can carry out suppression to a certain degree.
Insulating wrapped is formed to the core 10 of above-mentioned formation, as shown in Figure 6 (a) by the whole of special-shaped portion 40 or the coil 30 and make coil device 20 of reeling at least partially.Coil 30 can exemplify manual coiling or machinery winding.In addition, also can cut off a part for core 10 and form space, utilizing space to insert the air core coil reeled in advance.Space can backfill with magnetic material or nonmagnetic material structure as previously mentioned.
In the present invention, when manual coiling or machinery winding coil 30, by forming radius 14 as Fig. 3 or Fig. 5 or taper 16 in the outer peripheral face side of core 10 in advance, the situation that can be right angle than bight reels coil 30 more closely.Particularly when manual coiling coil 30, less tension force applied to wire and complete, therefore, it is possible to alleviate the fatigue of operator and improve operating efficiency etc.In addition, be also pre-formed radius 18 by the inner peripheral surface side at core 10, thus same effect can be obtained.And, by these, as described above, the winding length of the number of turn relative to coil 30 can be shortened, therefore, it is possible to suppress the rising of the D.C. resistance of coil 30, and can deviation be suppressed.
Fig. 7 (b) illustrates coil device 21(Fig. 6 (b) in the core 11 of comparative example with isopycnic MF) be energized when, in the distribution of magnetic flux density that core 11 produces.With reference to Fig. 7 (b), the inner circumferential I side that is distributed in of the magnetic flux density of known core 11 is concentrated, and O side, periphery is more sparse, and particularly OS part in both ends only has the magnetic flux of almost pettiness to pass through.Therefore, by the both ends OS part that the magnetic flux density of the O side, periphery of cutting down core 11 is few, and the area S1 being effectively used to inner circumferential I side increases, the magnetic flux density of inner circumferential I side can be reduced without the need to increasing magnetic material weight, the equalization of magnetic flux density can be sought the isopycnic MF of magnetic flux distribution as shown in the example of Fig. 7 (a) (coil device 20 is Fig. 6 (a)), and the maximization of core 10, the waste of magnetic material can be prevented.
In addition, think the magnetic flux density of core 10 of example more in the distribution of inner circumferential I side be like this that inner circumferential side girth is larger with the ratio (poor) of outer circumferential side girth because the shape of core 11 is ring-type.That is, in such core 11, magnetic flux density concentrates on the short inner circumferential I side of magnetic circuit, instead of the O side, periphery of the core 11 of magnetic circuit length.This tendency significantly occurs in the press-powder core that permeability is low.In addition, if be the core of the ring-type that inner circumferential side girth is little with the ratio (poor) of outer circumferential side girth, the effect that the area changing inner circumferential side and outer circumferential side like that with regard to reducing the present invention brings.
In the present invention, about the special-shaped portion 40 of core 10, by making the area of the area ratio outer circumferential side of the inner circumferential side of its section large, the magnetic flux density of the inner face side of core 10 can be reduced.Therefore, compared with the core of the square-section identical with the sectional area of comparative example, the heating that the concentrated magnetic saturation that causes that can suppress magnetic flux or core loss cause, in addition, can reach the raising of the inductance value of Unit Weight.
< variation >
In above-mentioned execution mode, core 10(core main body) by integrally formed and make.But, as shown in Figure 8, core 10 also by engaging multiple pieces 42,42 and formed.By being made such block 42,42, can easily form compared with integrally formed.Such as block 42,42 can hold the powder of magnetic material by the tubular mould being equivalent to the odd-shaped cross section of section in cross section, makes from pressurizeing up and down.
In addition, in above-mentioned execution mode, form the mode in special-shaped portion 40 with the whole surrounding throughout core 10, about its section, make the area of inner circumferential side be greater than outer circumferential side.But, such as, in the core apparatus of reactor, have not throughout the whole situation of the coil that reels around of core 10.Under these circumstances, as shown in FIG. 9 and 10, about the block 42,42 in the coil winding portion 44 of coil winding, be set to the special-shaped portion 40 making the area ratio outer circumferential side of the inner circumferential side of section large, the connecting portion 46 of non-winding line circle adopts section to be that rectangle etc., the i.e. block 48 of the shape of the area equation of inner circumferential side and outer circumferential side also can.Section is the block 48 of rectangle, easilier to be shaped than the block 42,42 with the such section in special-shaped portion 40, therefore, by making the block 48 of connecting portion 46 be rectangle, with adopt around there is the block 42 of the section in special-shaped portion 40,42(with reference to Fig. 8 throughout whole) situation compared with, the easy to manufacture of core 10 can be made and carry out at an easy rate.The block 48 of connecting portion 46 also can be formed by multiple pieces certainly.
Core 10 shown in Fig. 8 to Figure 10 can change the length of coil winding portion 44 or connecting portion 46 by the quantity changing block 42 or block 42 and 48, therefore also have the advantage of the design freedom that can improve core 10.
[embodiment]
Use the powder of sendust alloy composition as magnetic material, define the press-powder core (with reference to Figure 11 (a)) of example and the press-powder core (with reference to Figure 11 (b)) of comparative example.Core all uses the magnetic material of the 157g of identical weight at example, comparative example.
Core is external diameter 44.85mm, internal diameter 25.2mm(and width 19.65mm), window ara 4.99cm
2, Width sectional area 2.46cm
2, volume 27.06cm
3.The core height of example is 30mm, and the core height of comparative example is 25mm.About other size, please refer to Figure 11.The difference of height because produce like this, that is, is rectangle relative to the cross section of comparative example, and the core of example is with identical internal-and external diameter, sectional area and make the sectional area S1 of inner circumferential side produce greatly than the sectional area S2 of outer circumferential side.In addition, the area S1 of the inner circumferential side of the core 10 shown in this Figure 11 and Fig. 5 is set to 1.37:1 with the ratio of the area S2 of outer circumferential side.
Reel to above-mentioned core the wire of insulating wrapped of 36 thick 1.6mm respectively, as coil device (choking-winding) (illustrate example at Fig. 6 (a), at Fig. 6 (b), comparative example is shown).About the length of wire (coil) being wound on each core, example is 2.94m, and comparative example is that 2.99m(is with reference to table 1 described later).This means compared with the coil device of comparative example, the coil device of example can make wire closely winding core.
About the example of making and the coil device of comparative example, use LCR measuring instrument and HP4285A, determine initial inductance value (Ls) at frequency 100kHz.In addition, HIOKI3540m Ω Hi-TESTER is used to determine D.C. resistance (Rdc).To the results are shown in table 1.
[table 1]
With reference to table 1, known compared with comparative example, the initial inductance value of example is high.More specifically, the initial inductance value of example about improves 6% relative to comparative example.This thinks because example increases the area S1 of the many inner circumferential sides of magnetic flux in the section in special-shaped portion, thus reduces magnetic flux density, can not magnetic saturation and can improve inductance value.
In the present embodiment, because example is identical with the weight of the core of comparative example, so the initial inductance value of Unit Weight also about improves 6%.
In addition, example, can closely coiled electrical conductor by forming taper 16 and radius 18 in the short transverse two edges of periphery and inner circumferential, therefore, even if the identical total length that also can shorten coiling (coil) of the number of turn.It can thus be appreciated that the DC resistance (Rdc) being derived from coil also diminishes.Therefore, there is the advantage of the D.C. resistance loss that can reduce coil device 20.
About the coil device of example and comparative example, flow through the DC bias current of 0A ~ 50A, investigated direct current overlapping features.Show the result in table 1 and Figure 12.With reference to figure, known compared with comparative example, the inductance value of example is high.Particularly, be the scope of 0A ~ 20A at DC bias current, all show inductance value more extra high than comparative example.This thinks that example increases the area S1 of the inner circumferential side that magnetic flux density uprises in the section in special-shaped portion, thus can guarantee magnetic circuit also as described above.
And then, calculate the effective magnetic circuit length (l) of each coil device from initial inductance value, about can shorten 6%.That is, according to the present invention, knownly in the section of core, make that the area of inner circumferential side is comparatively large, outer circumferential side is less, thus make the inner circumferential side of the effective magnetic circuit length deflection core of the center of gravity becoming magnetic flux distribution.On the other hand, in comparative example, it is the centre position of inner circumferential and periphery.
Then, imagination should measure the real-world operation state of core loss in example and comparative example and connect triangular wave 100kHz, 10Ap-p(effective value to the coil device of the present embodiment and be about 3A) high-frequency current, the result of mensuration is shown in Table 2.
[table 2]
In order to the core loss in magnetic flux density more same under identical conditions, also need to make inductance value identical except magnetizing force (number of turn × current value), therefore example makes the initial inductance value increasing amount of about 6% reduce with consistent with comparative example, unreel 1T from 36T for this reason and become 35T, thus about reducing 6%(formula 1) and become roughly the same value.
< formula 1 > (1-35
2/ 36
2) × 100%
In addition, among core loss in table 2, also comprise the A.C.power loss in D.C. resistance loss, spiral portion in theory, but in this mensuration owing to disconnecting direct current, make to comprise the diameter of wire of DC resistance, spiral mode is also identical, so the cardinal principle core loss that can be considered as in same magnetic material is poor.
According to table 2, known compared with comparative example, example significantly reduces core loss.Compared with the comparative example core of square-section identical with sectional area thus, example can reduce core loss by relaxing concentrating of magnetic flux, and result can suppress heating.
Above-mentioned explanation is for illustration of the present invention, should not be construed as the invention limiting and record in claims, or reduces the scope.In addition, each portion of the present invention formation is not limited to above-described embodiment, obviously can carry out various distortion in the technical scope of claims.
Label declaration
10 cores;
12 window portions;
14 radiuses (outer circumferential side chamfering);
16 tapers (outer circumferential side chamfering);
18 radiuses (inner circumferential side chamfering);
20 coil devices;
30 coils;
40 special-shaped portions;
42 pieces (special-shaped portion);
44 coil winding portions.
Claims (10)
1. a core, be have as magnetic material metal-powder carried out press molding, maybe will the closed magnetic circuit core of core main body of oxidation magnetic material press molding sintering, it is characterized in that:
Described core main body has special-shaped portion, and when dividing the section of the Width from inner circumferential towards periphery with the mid line of inner periphery and the outer periphery, the area of the inner circumferential side in described special-shaped portion is greater than the area of outer circumferential side.
2. core as claimed in claim 1, wherein, the described section in described special-shaped portion makes maximum height than described mid line inner circumferential side side higher than the maximum height of outer circumferential side.
3. core as claimed in claim 1 or 2, wherein, the center of gravity of the described section in described special-shaped portion is positioned at inner circumferential side relative to described mid line.
4. as claim 1 to claim 3 any one as described in core, wherein, the described section in described special-shaped portion implements chamfering to the short transverse two edges of outer circumferential side.
5. core as claimed in claim 4, wherein, the described section in described special-shaped portion implements the chamfering amount chamfering less than the chamfering of the short transverse two edges of described outer circumferential side to the short transverse two edges of inner circumferential side.
6. as claim 1 to claim 5 any one as described in core, wherein, magnetic permeability mu is less than 200.
7. as claim 1 to claim 6 any one as described in core, wherein, described special-shaped portion be described core main body whole around.
8. as claim 1 to claim 6 any one as described in core, wherein, described special-shaped portion is located at a part for described core main body.
9. core as claimed in claim 8, wherein, described special-shaped portion is at least located at the part of winding coil.
10. a coil device, to claim 1 to claim 9 any one described in core carry out insulating wrapped, and the coil that reels forms.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014178879 | 2014-09-03 | ||
| JP2014-178879 | 2014-09-03 | ||
| JP2015154744A JP2016054287A (en) | 2014-09-03 | 2015-08-05 | Core and coil device using the same |
| JP2015-154744 | 2015-08-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105390226A true CN105390226A (en) | 2016-03-09 |
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ID=55422415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510553888.6A Pending CN105390226A (en) | 2014-09-03 | 2015-09-02 | A core and a coil device using the core |
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| CN (1) | CN105390226A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110268488A (en) * | 2017-02-15 | 2019-09-20 | 株式会社自动网络技术研究所 | Reactor |
| CN111370201A (en) * | 2017-04-19 | 2020-07-03 | 株式会社村田制作所 | Inductor component |
| CN111868853A (en) * | 2018-03-30 | 2020-10-30 | 京瓷株式会社 | Core for inductor, core for electronic pen, electronic pen, and input device |
-
2015
- 2015-09-02 CN CN201510553888.6A patent/CN105390226A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110268488A (en) * | 2017-02-15 | 2019-09-20 | 株式会社自动网络技术研究所 | Reactor |
| CN110268488B (en) * | 2017-02-15 | 2021-03-23 | 株式会社自动网络技术研究所 | Electric reactor |
| CN111370201A (en) * | 2017-04-19 | 2020-07-03 | 株式会社村田制作所 | Inductor component |
| CN111868853A (en) * | 2018-03-30 | 2020-10-30 | 京瓷株式会社 | Core for inductor, core for electronic pen, electronic pen, and input device |
| CN111868853B (en) * | 2018-03-30 | 2022-03-29 | 京瓷株式会社 | Inductor core, electronic pen, and input device |
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