EP0385220A1 - Dispositif de bobine - Google Patents
Dispositif de bobine Download PDFInfo
- Publication number
- EP0385220A1 EP0385220A1 EP19900103165 EP90103165A EP0385220A1 EP 0385220 A1 EP0385220 A1 EP 0385220A1 EP 19900103165 EP19900103165 EP 19900103165 EP 90103165 A EP90103165 A EP 90103165A EP 0385220 A1 EP0385220 A1 EP 0385220A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- magnetic
- gap
- coil
- coil device
- magnetic cores
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- 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 magnetic gap 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 magnetic gap in a closed magnetic path so that the magnetic core thereof is not saturated when a desired current is caused to flow.
- a magnetic gap (hereinafter referred simply to as gap) is formed therein to reduce the effective permeability ⁇ within a range of 50 to 300.
- Another object of the present invention resides in providing an improved coil device which realizes lower production cost and enhanced reliability.
- a coil device comprising magnetic cores which form a closed magnetic path therein and have a magnetic gap in such path, and a coil wound on the magnetic cores partially.
- the feature of the present invention resides in a structure where the mutually opposed portions of the magnetic cores in the region to form the magnetic gap 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 magnetic gap is formed between the opposed faces of center legs, and the coil is so wound as to surround the magnetic gap.
- the fore end is shaped with curves defined by logarithmic functions, and a planar member is provided on the fore end, or projections are formed on the face of the fore end.
- 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, 2a, and a coil 4 is wound thereon.
- FIG. 26 Some examples of such sectionally E-shaped magnetic cores are illustrated in Figs. 26 through 28.
- a rectangular core is shaped into E, and its center leg is shaped to be columnar.
- the next example of Fig. 27 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. 27 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 (2b1, 2b2, 2b3, 2b4) and 3b (3b1, 3b2, 3b3, 3b4) 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 2b1 and 3b1 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. And 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 in Fig. 3, 2.0 mm in Fig. 4, and 1.8 mm in Fig. 5 respectively so that the effective permeability ⁇ becomes uniform.
- opposed ends 2b3, 3b3 of Fig. 6 are so formed that the sectional areas thereof are reduced by stepped projections 2e, 3e; and opposed ends 2b4, 3b4 of Fig. 7 are so formed that the sectional areas thereof are reduced, and a core member 5a identical in material with the magnetic cores is inserted therebetween while being held in a gap filler (not shown) which exerts no harmful influence on the magnetic permeability ⁇ .
- Fig. 8 graphically represents a B-H curve obtained in a conventional coil device using magnetic cores of the shape shown in Fig. 2; and Figs. 9 through 13 graphically represent B-H curves in coil devices using magnetic cores of the shapes shown in Figs. 3 through 7, respectively.
- the saturation magnetic flux density Bm in the conventional coil device with opposed ends of the known shape shown in Fig. 8 is 5510 Gs; whereas in the coil devices of the present invention using magnetic cores of the shapes shown in Figs. 9, 10, 11, 12 and 13, the saturation magnetic flux densities are 5480, 5400, 5200, 5330 and 5400 Gs, respectively. It is also found that the linearity in the latter is not changed, although each density thereof is slightly lower than that in Fig. 8.
- Table 1 shown below is a list of experimental results obtained by using a tester 6 of Fig. 14 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 shapes (a) through (f) correspond respectively to the shapes of magnetic cores shown in Figs.
- the shapes in the embodiments of the present invention shown in Figs. 3 through 7 are 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 saturation magnetic flux density is retained at a relatively high value, and the temperatures in the individual portions are lower due to the insertion of a core member 5a which is composed of the same material as that of the magnetic core.
- 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.
- 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.
- Typical modifications include a curved shape shown in Fig. 15; a shape of Fig. 16 where the sectional area is reduced with curved surfaces toward the opposed end faces; a bowl-like shape shown in Fig.
- projections 14, 14 are formed on the faces of fore ends of magnetic cores 12a, 12b as illustrated in Fig. 25, there is attainable an advantage of rendering the flux density uniform in the gap and reducing the leakage flux that interlinks with the coil.
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 true EP0385220A1 (fr) | 1990-09-05 |
EP0385220B1 EP0385220B1 (fr) | 1995-05-03 |
Family
ID=12731812
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19900103165 Expired - Lifetime EP0385220B1 (fr) | 1989-02-27 | 1990-02-19 | Dispositif de bobine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0385220B1 (fr) |
JP (1) | JP2791817B2 (fr) |
DE (1) | DE69019033T2 (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0518421A1 (fr) * | 1991-06-12 | 1992-12-16 | Koninklijke Philips Electronics N.V. | Dispositif inductif |
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 |
WO2022027962A1 (fr) * | 2020-08-05 | 2022-02-10 | 广东伊戈尔智能电器有限公司 | Noyau magnétique en poudre métallique combiné et dispositif d'inductance formé par celui-ci |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0415220U (fr) * | 1990-05-29 | 1992-02-06 | ||
ATE473538T1 (de) | 2001-05-08 | 2010-07-15 | 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 |
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 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57130402U (fr) * | 1981-02-09 | 1982-08-14 | ||
US4359706A (en) * | 1979-12-18 | 1982-11-16 | Arnold Flack | Magnet pole pieces and pole piece extensions and shields |
US4454557A (en) * | 1982-04-15 | 1984-06-12 | Mcgraw-Edison Company | Non-linear alternating current transducer |
US4728918A (en) * | 1984-09-24 | 1988-03-01 | Siemens Aktiengesellschaft | Storage coil with air gap in core |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS471643U (fr) * | 1971-01-25 | 1972-08-18 | ||
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 |
JPS6025127U (ja) * | 1983-07-27 | 1985-02-20 | ソニー株式会社 | トランス |
-
1990
- 1990-02-19 DE DE1990619033 patent/DE69019033T2/de not_active Expired - Fee Related
- 1990-02-19 EP EP19900103165 patent/EP0385220B1/fr not_active Expired - Lifetime
- 1990-02-27 JP JP2048830A patent/JP2791817B2/ja not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 | ||
US4454557A (en) * | 1982-04-15 | 1984-06-12 | Mcgraw-Edison Company | Non-linear alternating current transducer |
US4728918A (en) * | 1984-09-24 | 1988-03-01 | Siemens Aktiengesellschaft | Storage coil with air gap in core |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0518421A1 (fr) * | 1991-06-12 | 1992-12-16 | Koninklijke Philips Electronics N.V. | Dispositif inductif |
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 |
WO2018099137A1 (fr) * | 2016-11-30 | 2018-06-07 | 广东美的厨房电器制造有限公司 | Ensemble noyau magnétique de transformateur, transformateur et appareil électrique |
WO2022027962A1 (fr) * | 2020-08-05 | 2022-02-10 | 广东伊戈尔智能电器有限公司 | Noyau magnétique en poudre métallique combiné et dispositif d'inductance formé par celui-ci |
Also Published As
Publication number | Publication date |
---|---|
DE69019033T2 (de) | 1995-08-31 |
DE69019033D1 (de) | 1995-06-08 |
EP0385220B1 (fr) | 1995-05-03 |
JP2791817B2 (ja) | 1998-08-27 |
JPH02290005A (ja) | 1990-11-29 |
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