EP0385220B1 - Dispositif de bobine - Google Patents

Dispositif de bobine Download PDF

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Publication number
EP0385220B1
EP0385220B1 EP19900103165 EP90103165A EP0385220B1 EP 0385220 B1 EP0385220 B1 EP 0385220B1 EP 19900103165 EP19900103165 EP 19900103165 EP 90103165 A EP90103165 A EP 90103165A EP 0385220 B1 EP0385220 B1 EP 0385220B1
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EP
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Prior art keywords
gap
coil
core
coil device
magnetic
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EP19900103165
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German (de)
English (en)
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EP0385220A1 (fr
Inventor
Shinichiro Tdk Corporation Ito
Yukiharu Tdk Corporation Kinoshita
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TDK Corp
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TDK Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures

Definitions

  • the present invention relates to improvements in a coil device for use in a flyback transformer, a switching power transformer, a choke coil or the like. And more particularly, it relates to improvements in a magnetic core with a gap which is filled by magnetic flux and also in a coil device employing such a magnetic core.
  • any of the conventional transformers, choke coils and so forth known heretofore it is customary to form a gap in a closed magnetic path so that the magnetic core thereof is not saturated when a desired current is caused to flow.
  • a gap is formed therein to reduce the effective permeability » within a range of 50 to 300.
  • the coils of course are not comparable with the invention since they are a direct prolongation of each of the coil pieces and are neither isolated from it nor are they supplied with extra current and voltage.
  • Japanese patent application is directed to a non-linear choke coil and has no gap since the opposite cores are in contact with each other.
  • the cores also are tapered but are asymmetric in relation to each other.
  • US-Patent 4 454 557 deals with an alternating currenct transformer containing a yoke with an air gap where said air gap is configured such as to provide a non-linear magnetic response for changes in current.
  • the yoke is claimed to be mostly C-shaped and may be curved spherically in order to reach magnetic satuation as close to the gap as possible. Then the voltage response of the device is as is normal for the BH-curve near the saturation branch and can be said to be logarithmic.
  • This logarithmic response is needed by the inventors to receive a high gain at low currents and a low gain at high currents in a secondary coil, so as to receive a broad dynamic range in a secondary circuit where the signal is used by a sensing meter to regulate or to interrupt the current in case of current overflow or fault-current.
  • the invention does not deal with current transformation but with linear power transformation in the linear range of the BH-curve and does not use different numbers of windings in the primary or secondary circuit respectably.
  • Another object of the present invention resides in providing an improved coil device which realizes lower production cost and enhanced reliability.
  • the coil device cited above also comprising magnetic cores which form a closed magnetic path therein and have a small gap in such path, and a coil wound on the magnetic cores partially.
  • the first important feature of the invention is the logorithmic shape of the core ends as is described in claim 1, where such geometry adjacent both sides of the gap provides linearity of the magnetic flux in the air gap, resulting in a sufficiently linear B-H-curve and a reduced saturation magnetic flux density.
  • the second feature of the present invention resides in a structure where the mutually opposed pcrtlons of the magnetic cores are so shaped that the cross-sectional area of the fore end becomes smaller than the cross-sectional area of the base end.
  • the rate of the cross-sectional area of the fore end to that of the base end is defined to be within a range of 1 to 90 percent.
  • the magnetic cores consist of two E-shaped core elements of which legs butt to each other, and a gap is formed between the opposed faces of center legs, and the coil is so wound as to surround the gap.
  • a coil device (1) shown in Fig. 1 comprises two sectionally E-shaped magnetic cores (2), (3) of which fore ends butt to each other, wherein a gap (5) is formed between opposed faces of center legs (2a), (3a), and a coil (4) is wound thereon.
  • FIG. 9 Some examples of such sectionally E-shaped magnetic cores are illustrated in Figs. 9 through 11.
  • a rectangular core is shaped into E, and its center leg is shaped to be columnar.
  • the next example of Fig. 10 is called a pot type core with a columnar leg formed at the center of a non-through tubular member.
  • the tubular member of the pot core shown in Fig. 10 is partially cut off.
  • Any of the above exemplary cores has an E-shaped cross section.
  • a pair of such cores are combined with each other and a coil is wound on the center legs thereof, although merely a single core is illustrated in each of the above diagrams.
  • such core is composed of ferrite material.
  • Fig. 2 illustrates the shape of gap portions in magnetic cores used in a conventional coil device, wherein the shapes of mutually opposed ends (2b) and (3b) of the magnetic cores and the gap width thereof are so determined that the effective permeability of the magnetic core is rendered uniform in the entirety.
  • the opposed ends (2b) and (3b) of the magnetic cores in the conventional coil device of Fig. 2 are shaped to be columnar in a manner that the sectional areas thereof remain unchanged.
  • the gap has a width of 3 mm.
  • opposed ends (2b2), (3b2) are so shaped that the sectional areas thereof are reduced by tapered portions (2d), (3d) toward opposed faces (2c), (3c), and the gap (5) is formed to have a width of 2.5 mm respectively so that the effective permeability » becomes uniform.
  • Fig. 4 graphically represents a B-H curve obtained in a conventional coil device using magnetic cores of the shape shown in Fig. 2. Comparing such curves with one another, the saturation magnetic flux density Bm in the conventional coil device with opposed ends of the known shape shown in Fig. 4 is 5510 Gs. It is also found that the linearity in the latter is not changed, although each density thereof is slightly lower than that in Fig. 4.
  • Table 1 shown below is a list of experimental results obtained by using a tester (6) of Fig. 6 and detecting the temperatures in-coil centers X, coil ends Y, cores Z and peripheries W of coil devices (1) having the opposed ends of the aforementioned shapes (under the testing conditions including a frequency of 100 kHz, a current of 0.8 A, sine wave and ambient temperature of 40°C).
  • the shape (a) is shown in Fig. 2 and (d) is shown in Fig. 3.
  • the shape in the embodiment of the present invention shown in Fig . 3 is so improved that, as listed in Table 1, the temperature in the coil center X is lower by 5 to 20°C; the temperature in the coil end Y is lower by 3 to 12°C; the temperature in the core Z is lower by 1.5 to 10°C; and the temperature in the periphery W is lower by 2.5 to 5.5°C.
  • the present invention is structurally simple and ensures satisfactory linearity in the B-H curve with another advantage of preventing abnormal generation of heat that may be caused in the coil around the gap by some leakage magnetic flux.
  • the B-H curve of the coil device shown in Fig. 3 is quite identically to the B-H curve of Fig. 5.
  • the present invention is not limited to the above embodiments alone, and a variety of modifications may be contrived as well.
  • a gap filler of a suitable material free from exerting any harmful influence on the magnetic permeability » may be inserted in the gap, and the gap may be formed between some other legs than the center legs.
  • similar effects can be achieved in modified ones as well as in the exemplary shapes of the aforementioned embodiments on condition that the sectional area is reduced toward the opposed faces.
  • embodiments can be concerned with a device having two closed magnetic paths, the present invention is applicable also to any device with one, three or more closed magnetic paths. It is a matter of course that the invention can be carried into effect in any other coil device.
  • projections (14), (14) are formed on the faces of fore ends of magnetic cores (13a), (13b) as illustrated in Fig. 9, there is attainable an advantage of rendering the flux density uniform in the gap and reducing the leakage flux that interlinks with the coil.

Claims (5)

  1. Dispositif de bobine (1) à deux noyaux magnétiques en E (2 et 3), dans lequel chacune des branches centrales (2a et 3a) desdits noyaux magnétiques en E est plus courte que les autres branches, les branches desdits deux noyaux magnétiques en E étant disposées de façon à faire face l'une à l'autre, à un entrefer (5) formé entre les aires opposées desdites branches centrales des noyaux magnétiques, et dans lequel une bobine (4) est enroulée de façon à entourer ledit entrefer (5) complètement,
    caractérisé en ce que chacune desdites branches centrales des noyaux magnétiques, qui font face l'une à l'autre en formant ledit entrefer (5), est réduite en cône de l'extrémité de base vers le milieu de l'extrémité avant, et que la réduction en cône suit une courbe logarithmique qui est représentée par l'équation suivante: γ s - γ = χ g l n x s x
    Figure imgb0005
     dans laquelle:
       χg = distance entre le milieu dudit entrefer (5) et la face avant du noyau (2a),
       χs = distance entre le milieu dudit entrefer (5) et l'extrémité de base du noyau (2b),
       χ = distance du point d'origine des coordonnées le long de l'axe χ,
       γs = rayon de l'extrémité du noyau (2a ou respectivement 2b), et
       γ = rayon du noyau (2a ou respectivement 2b) sur la coordonnée en correspondance avec la position.
  2. Dispositif de bobine (1) selon la revendication 1,
    caractérisé en ce que les parties (2a et 2b) du noyau magnétique sont si formées dans la zone de l'entrefer (5) que le rapport entre l'aire de section transversale à l'extrémité avant (2a) et celle à l'extrémité de base (2b) soit au dedans de la gamme entre 1 et 90 %.
  3. Dispositif de bobine (1) selon la revendication 1,
    caractérisé en ce que chacune desdites parties (2a et 2b) présente une surface plane qui s'étendent en parallèle et en face à l'autre surface.
  4. Dispositif de bobine (1) selon la revendication 3,
    caractérisé en ce que lesdites parties (2a et 2b) ont un axe central commun.
  5. Dispositif de bobine (1) selon la revendication 3,
    caractérisé en ce que des parties en saillie sont formées sur la face à l'extrémité avant (2a).
EP19900103165 1989-02-27 1990-02-19 Dispositif de bobine Expired - Lifetime EP0385220B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP45889/89 1989-02-27
JP4588989 1989-02-27

Publications (2)

Publication Number Publication Date
EP0385220A1 EP0385220A1 (fr) 1990-09-05
EP0385220B1 true EP0385220B1 (fr) 1995-05-03

Family

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EP19900103165 Expired - Lifetime EP0385220B1 (fr) 1989-02-27 1990-02-19 Dispositif de bobine

Country Status (3)

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EP (1) EP0385220B1 (fr)
JP (1) JP2791817B2 (fr)
DE (1) DE69019033T2 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0415220U (fr) * 1990-05-29 1992-02-06
EP0518421A1 (fr) * 1991-06-12 1992-12-16 Koninklijke Philips Electronics N.V. Dispositif inductif
DE60236926D1 (de) 2001-05-08 2010-08-19 Univ Aalborg Transversalflussmaschine mit einem stator aus e-förmigen laminaten
JP2004186628A (ja) * 2002-12-06 2004-07-02 Koito Mfg Co Ltd トランス
JP4775254B2 (ja) * 2006-12-26 2011-09-21 トヨタ自動車株式会社 リアクトルコアおよびリアクトル
JP5494612B2 (ja) * 2011-10-18 2014-05-21 株式会社豊田自動織機 磁性コア、及び誘導機器
JP6462234B2 (ja) 2014-05-14 2019-01-30 株式会社デンソー リアクトル
JP2016092317A (ja) * 2014-11-10 2016-05-23 星和電機株式会社 フェライトコア
JP2016171192A (ja) * 2015-03-12 2016-09-23 株式会社豊田自動織機 誘導機器
CN106409479A (zh) * 2016-11-30 2017-02-15 广东美的厨房电器制造有限公司 变压器的磁芯组件和变压器和用电设备
CN108878096B (zh) 2017-05-16 2021-08-06 台达电子企业管理（上海）有限公司 磁性元件
CN111785490A (zh) * 2020-08-05 2020-10-16 广东伊戈尔智能电器有限公司 组合的金属粉末磁芯及所构成的电感装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS471643U (fr) * 1971-01-25 1972-08-18
US4359706A (en) * 1979-12-18 1982-11-16 Arnold Flack Magnet pole pieces and pole piece extensions and shields
JPS57130402U (fr) * 1981-02-09 1982-08-14
JPS588926U (ja) * 1981-07-10 1983-01-20 株式会社デンソー コア一体モ−ルド型点火コイル
US4454557A (en) * 1982-04-15 1984-06-12 Mcgraw-Edison Company Non-linear alternating current transducer
JPS6025127U (ja) * 1983-07-27 1985-02-20 ソニー株式会社 トランス
DE8428108U1 (de) * 1984-09-24 1985-01-03 Siemens AG, 1000 Berlin und 8000 München Speicherdrossel

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Publication number Publication date
JP2791817B2 (ja) 1998-08-27
DE69019033T2 (de) 1995-08-31
EP0385220A1 (fr) 1990-09-05
DE69019033D1 (de) 1995-06-08
JPH02290005A (ja) 1990-11-29

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