EP0173100B1 - Bobine d'allumage de forte puissance - Google Patents

Bobine d'allumage de forte puissance Download PDF

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Publication number
EP0173100B1
EP0173100B1 EP85109620A EP85109620A EP0173100B1 EP 0173100 B1 EP0173100 B1 EP 0173100B1 EP 85109620 A EP85109620 A EP 85109620A EP 85109620 A EP85109620 A EP 85109620A EP 0173100 B1 EP0173100 B1 EP 0173100B1
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EP
European Patent Office
Prior art keywords
core
preferred direction
main
ignition coil
magnetised
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.)
Expired - Lifetime
Application number
EP85109620A
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German (de)
English (en)
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EP0173100A3 (en
EP0173100B2 (fr
EP0173100A2 (fr
Inventor
Robert Ing. Tschuk
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TSCHUK Robert Ing
Original Assignee
BERTOS AG
TSCHUK Robert Ing
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Publication date
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Application filed by BERTOS AG, TSCHUK Robert Ing filed Critical BERTOS AG
Priority to AT85109620T priority Critical patent/ATE64036T1/de
Publication of EP0173100A2 publication Critical patent/EP0173100A2/fr
Publication of EP0173100A3 publication Critical patent/EP0173100A3/de
Publication of EP0173100B1 publication Critical patent/EP0173100B1/fr
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Anticipated expiration legal-status Critical
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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
    • H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/12—Ignition, e.g. for IC engines

Definitions

  • the invention relates to a high-performance ignition coil for internal combustion engines with a soft magnetic layered core made of grain-oriented sheet and air gap and a primary and secondary winding surrounding the main core, in which the main flow generated by the primary winding in the main core runs in the preferred direction of the grain-oriented sheet.
  • Such an ignition coil is known from DE-U-79 24 989.
  • an obliquely arranged air gap in the main core with permanent magnets attached therein is mandatory, while the course of the main flow in the main core has not been explicitly discussed.
  • the dimensioning of the remaining sections of the magnetic circuit was not discussed in any way there.
  • CH-A-342 282 discloses a core for magnetic circuits, in particular for magnetic amplifiers, which is constructed from U-plates which are layered without overlapping layers and in which the height of the yokes lying transverse to the preferred magnetic direction increases by the ratio of an induction along the rolling direction an induction transverse to the rolling direction at the same field strength is greater than twice the leg width in order to make the yokes and legs magnetically equivalent.
  • the magnetic field in the air gap where the magnetic energy is concentrated already has such a high magnetic field strength that the permanent magnets in their coercive force are overridden.
  • the air gap is arranged, for example, obliquely in the magnetic circuit (DE-U-79 24 989), or else the air gap is arranged on one or both end faces of the main core which carries the exciting primary winding (DE-B - 12 55 990) and / or the air gap area is increased.
  • the air gap is arranged, for example, obliquely in the magnetic circuit (DE-U-79 24 989), or else the air gap is arranged on one or both end faces of the main core which carries the exciting primary winding (DE-B - 12 55 990) and / or the air gap area is increased.
  • the permanent magnets are expensive and the arrangement in the magnetic circuit during manufacture requires great care.
  • Permanent magnet materials made of cobalt and rare earths, especially cobalt samarium, are characterized by a particularly large coercive field strength with high saturation and good temperature resistance.
  • thermal stress the exceeding of which leads to a drop in the coercive field strength and thus the storage capacity of an ignition coil can be significantly impaired.
  • core sheets in E, I, U, I or M shape such as are standardized in DIN 41302, for example, are used when using soft magnetic material.
  • a common feature of these core sheets is that the magnetic induction is practically the same size over the entire magnetic circuit.
  • core plates for ignition coils according to DIN 41302 or similar symmetrical dimensions are used.
  • Grain-oriented electrical sheet is distinguished from the other soft magnetic materials by a pronounced magnetic preferred direction in the rolling direction (longitudinal direction) and has about ten times better magnetizability in this longitudinal direction than conventional non-grain-oriented electrical sheets. Across the direction of rolling, grain-oriented electrical steel has about the same magnetic properties as non-grain-oriented electrical steel.
  • the invention has for its object to design and build the soft magnetic core of a high-performance ignition coil of the type described in such a way that with unchanged primary and secondary winding and thus unchanged magnetic induction in the main core and An unchanged large magnetic energy can be stored without arrangement of a permanent magnet and accordingly unchanged performance data of the ignition coil can be obtained.
  • This object is achieved according to the invention with a high-performance ignition coil of the type described at the outset in that the core is layered as a core of the core type with abutting core parts and without a permanent magnet in the air gap, and that with the same core layer height, the height of the yokes magnetized transversely to the preferred direction is approximately 1.5 times to 1.8 times the width of the main core magnetized in the preferred direction.
  • the core is layered as a jacket-type core with abutting core parts and without a permanent magnet in the air gap, and that with the same core layer height, the height of the yokes magnetized transversely to the preferred direction is approximately 0.75 to 0.9 times the width of the main core magnetized in the preferred direction.
  • the core is made of EI sheets with abutting core parts and without a permanent magnet in the air gap, and that with the same core layer height, the height of the yoke magnetized transversely to the preferred direction is approximately 0.75 to 0.9 times and the height of the I-shaped yoke magnetized in the preferred direction is approximately 0.5 times the width of the main core magnetized in the preferred direction.
  • the yoke parts of the core are expediently dimensioned transversely to the preferred direction of the grain-oriented sheet in magnetic induction in accordance with the assigned greatest possible permeability.
  • the core With the configuration of the core according to the invention, it is possible, while maintaining the number of turns of the primary and secondary windings and the cross-sectional area of the in the preferred direction, i.e. Rolling direction of the magnetized parts of the core, to achieve the same properties and performance data of the ignition coil, as can be achieved with the attachment of a permanent magnet for magnetic bias, only by slightly more material expenditure while increasing the cross-sectional area of the parts of the core magnetized transverse to the preferred direction.
  • ignition coils with a core designed and constructed in accordance with the invention which have practically half the power-to-weight ratio compared to pencil ignition coils, can now be subjected to a short-term thermal load of up to 150 C without permanent magnet, without the magnetic properties and thus the performance data of the ignition coil being influenced.
  • the height of the yokes magnetized transversely to the preferred direction is 1.7 times that of the core type cores or 0.85 times the width of the main core magnetized in the preferred direction for cores of the cladding type.
  • the air gap is expediently arranged in the main core in the middle of the primary winding.
  • this has the advantage of optimally dissipating the heat generated over the main core and the entire core.
  • the core consists of two identical U parts in a core layered from UU sheet metal or two identical E parts in the case of a core layered from EE sheet metal.
  • the core can advantageously be constructed from UU sheets and an I-shaped main core magnetized in the preferred direction, which is connected to the UU sheets with four wedge surfaces by an oblique fermentation cut, the air gap being arranged symmetrically on at least one end face of the main core.
  • the punched core sheets can advantageously be after-annealed.
  • FIG. 1 to 3 show a core structure with a soft magnetic layered core 1 of the core type, layered from UU sheets of the same shape.
  • a primary winding 2 with the number of turns wi and a secondary winding 3 with the number of turns W2 surround the main core 4.
  • the core sheets are stamped in such a way that both the main lerm 4 and the yoke leg 5 are magnetized in the magnetic preferred direction (rolling direction) of the grain-oriented sheet, while Yokes 6 and 7 are magnetized transversely to the magnetic preferred direction.
  • An air gap A is arranged in the main core 4 approximately in the middle of the primary winding 2.
  • the winding window has a width b and a height e.
  • the core layer height is d
  • the width of the main core 4 is a
  • the width of the yoke leg 5 is approximately a.
  • the height of yokes 6 and 7 is c.
  • the direction of rolling of the sheets is indicated by arrows.
  • F EL denotes the cross-sectional area of the main core 4 magnetized in the preferred direction
  • F EQ denotes the cross-sectional area of the yokes 6, 7 magnetized transverse to the preferred direction.
  • the core 1 is designed and constructed such that the ratio of yoke height c to core width a is 1.5 to 1.8, preferably 1.7.
  • Yokes 9 and 10 have a height ci2 here, while yoke legs 11 and 12 have a width of approximately a / 2.
  • the ratio of the height c / 2 of the yokes 9, 10 to the width a of the main core 4 is 0.75 to 0.9, preferably 0.85.
  • FIG. 7 shows a further example of a core structure of the jacket type according to the invention with a core 13 which is layered from E and I sheets.
  • the ratio of the height c / 2 of the one yoke 10 to the width a of the main core 4 is again 0.75 to 0.9, preferably 0.85, while the height a / 2 of the yoke 9 is approximately half the width a of the main core 4 is.
  • the yoke 9 is layered from 1-sheet metal, which are magnetized in the preferred direction.
  • the core sheets of both the core 6 of the core type and the cores 8, 13, 14 of the sheath type are punched in such a way that the main magnetic flux 0 H is built up in the rolling direction of the magnetic preferred direction of the grain-oriented sheet when it is acted upon by the current I of the primary winding 2.
  • the magnetic circuit is preferably interrupted approximately in the middle of the primary winding 2 by the air gap A, the main seat of the magnetic field.
  • the magnetic field is an energy store. According to the theory, the total energy present in the magnetic field is a coil through which current I flows
  • the inductance L is constant and that the coil fluxes are proportional to the exciting currents, that is, there is no iron or at least the iron is unsaturated.
  • the magnetic flux is a function of the current itself, so that when the iron core is saturated, the magnetic flux 0 increases with the current I; the coil inductance L decreases, and thus the storage capacity for magnetic energy.
  • the magnetization requirement of grain-oriented electrical sheets in the rolling direction is only about 1/10 of that required to magnetize the electrical sheets transverse to the rolling direction.
  • Cold and hot rolled, non-grain oriented electrical sheets and strips have approximately the same magnetization requirement as grain oriented sheets across the rolling direction.
  • the grain-oriented sheet can be specifically loaded with magnetic induction of 1.5 ... 1.7 T without requiring a greater magnetization than the conventional electrical sheets.
  • the core sheets of conventional and commercial type are dimensioned so that the cross section of the return flow is approximately the same size as the cross section of the main flow. If this type of electrical sheet is used, magnetic material with a pronounced preferred direction, e.g. Grain-oriented sheet with the preferred direction in the rolling direction applied, so that the part of the magnetic circuit leading the main magnetic flux can be subjected to a specific high load, those parts of the core sheet in which the magnetic flux must be driven transversely to the rolling direction, however, require a corresponding high need for magnetization.
  • magnetic material with a pronounced preferred direction e.g. Grain-oriented sheet with the preferred direction in the rolling direction applied
  • the magnetization requirement H (A / cm) for a commercially available grain-oriented sheet according to DIN 40600 is assigned to the specific material stress, the magnetic induction B (T).
  • Curve a) shows the magnetization requirement in the rolling direction, curve b) transverse to Rolling direction.
  • the magnetization requirement and the saturation properties of this material both in the rolling direction and transverse to the rolling direction are illustrated by the curves a) and b) of the relative permeability ur: In the rolling direction, the relative permeability is about ten times greater than in the transverse direction.
  • curve I shows the known shear when the magnetic circuit is oversaturated.
  • the shear of the characteristic curve I for example in the induction of 1.0 ... 1.2 T, is solely due to the increased magnetization requirement transverse to the rolling direction of the parts of the magnetic circuit .
  • the attachment of a permanent magnet in the air gap of the magnetic circuit avoids this disadvantage of the deflection and thus the storage capacity of the inductance, because, as is well known, the induction stroke is increased by the DC bias against the direction of flow of the ignition coil and the storage capacity increases quadratically with the current applied.
  • those parts of the magnetic circuit which are magnetized transverse to the rolling direction are dimensioned up to at most the induction which corresponds approximately to the maximum relative permeability.
  • a specific material stress of approximately 1.0 T can be seen from a design example for the core sheet from the relative permeability curve b) at the maximum permeability (point A).
  • point B In order to drive the main magnetic flux 0H through these sections transversely to the rolling direction, about 1.8 A / cm is required (point B).
  • the entire magnetic circuit is approximately balanced with respect to the magnetization if the parts of the magnetic circuit which are magnetized in the rolling direction are used until about the same magnetization requirement for these parts.
  • this is approximately the case in the magnetization curve a) for the sheet in the rolling direction when the magnetic sections in the rolling direction are specifically stressed with approximately 1.7 T induction (point C).
  • the sections of the longitudinal and transverse magnetization are approximately of the same length.
  • the factor is approximately 1.5 ... 1.8.
  • Fig. 10 also illustrates the invention.
  • this diagram shows the magnetic flux 0 as a function of the magnetic flux, the impressed current I.
  • Induction B 1 is shown in the coordinate, that is, based on the specific stress in the rolling direction; this is directly proportional to the main magnetic flux 0 H.
  • Curve II applies to a core sheet of conventional type, without cross-sectional reinforcement transverse to the rolling direction.
  • the flux 0 increases proportionally with the current I applied, until saturation is reached in the magnetic sections with the magnetization transverse to the rolling direction.
  • the magnetic flux hardly increases; the characteristic curve is strongly curved.
  • the design of the core according to the invention thus has the advantage that an expensive permanent magnet can be saved with slightly more material expenditure of the magnetic circuit and, moreover, the production is simplified considerably because no increased care and attention to the correct installation and the rich term polarization of the brittle permanent magnet must be dedicated.
  • ignition coils of this type with a practically half power-to-weight ratio can be subjected to thermal loads of up to 150 ° C. for a short time compared to pencil ignition coils without permanent magnets, without negatively influencing the magnetic properties and thus the performance data of the ignition coil.
  • the structure of the core according to the invention can be used not only for ignition coils, but also generally for magnetic energy stores, for example for switching power supplies, chokes in DC dividers in power electronics, etc.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Claims (11)

1. Bobine d'allumage de forte puissance pour moteurs à combustion interne ayant un noyau magnétique doux (1) feuilleté à partir de tôle à grains orientés, un entrefer (A), un enroulement primaire et un enroulement secondaire (2,3) entourant le noyau principal (4), dans lequel le flux principal (⌀H) engendré par l'enroulement primaire (2) dans le noyau principal (4) est dirigé dans le sens privilégié de la tôle à grains orientés, caractérisée en ce que le noyau est feuilleté, en tant que noyau (1) du type noyau proprement dit, par des pièces de noyau en butée les unes contre les autres et sans aimant permanent dans l'entrefer (Δ), et en ce que, pour une même hauteur des couches du noyau (d), la hauteur (c) des culasses (6, 7) magnétisées en sens transversal au sens privilégié est environ 1,5 à 1,8 fois la largeur (a) du noyau principal (4) magnétisé dans le sens privilégié.
2. Bobine d'allumage à forte puissance pour moteurs à combustion interne ayant un noyau magnétique doux (8,14) feuilleté à partir de tôle à grains orientés, un entrefer (A), un enroulement primaire et un enroulement secondaire (2, 3) entourant le noyau principal (4), dans lequel le flux principal (⌀H) engendré par l'enroulement primaire (2) dans le noyau principal (4) est dirigé dans le sens privilégié de la tôle à grains orientés, caractérisée en ce que le noyau est feuilleté, en tant que noyau (8, 14) du type cuirassé, par des pièces de noyau en butée les unes contre les autres et sans aimant permanent dans l'entrefer (Δ), et en ce que, pour une même hauteur des couches du noyau (d), la hauteur (c/2) des culasses (9, 10) magnétisées en sens transversal au sens privilégié est environ 0,75 à 0,9 fois la largeur (a) du noyau principal (4) magnétisé dans le sens privilégié.
3. Bobine d'allumage de forte puissance pour moteurs à combustion interne ayant un noyau magnétique doux (13) feuilleté à partir de tôle à grains orientés, un entre-fer(Δ), un enroulement primaire et un enroulement secondaire (2,3) entourant le noyau principal (4), dans lequel le flux principal (oH) engendré par l'enroulement primaire (2) dans le noyau principal (4) est dirigé dans le sens privilégié de la tôle à grains orientés, caractérisée en ce que le noyau (13) est feuilleté par des pièces de noyau en tôle en El en butée les unes contre les autres sans aimant permanent dans l'entrefer (A), et en ce que, pour une même hauteur des couches de noyau (d), la hauteur (c/2) de la culasse (10) magnétisée en sens transversal au sens privilégié, est environ 0,75 à 0,9 fois, et la hauteur (a/2) de la culasse (9) en 1 magnétisée dans le sens privilégié environ 0,5 fois la largeur (a) du noyau principal (4) magnétisé dans le sens privilégié.
4. Bobine d'allumage de forte puissance selon la revendication 1, 2 ou 3, caractérisée en ce que les parties de culasse (6, 7, 9, 10) du noyau (1, 8, 13, 14) sont dimensionnées, transversalement au sens privilégié de la tôle à grains orientés, pour ce qui est de l'induction magnétique, en correspondance avec la perméabilité la plus grande possible.
5. Bobine d'allumage de forte puissance selon la revendication 1 caractérisée en ce que la hauteur (c) des culasses (6,7) magnétisées en sens transversal au sens privilégié est 1,7 fois la largeur (a) du noyau principal (4).
6. Bobine d'allumage de forte puissance selon la revendication 2 ou 3, caractérisée en ce que la hauteur (c/2) des culasses (9, 10) magnétisées en sens transversal au sens privilégié est 0,85 fois la largeur (a) du noyau principal (4).
7. Bobine d'allumage de forte puissance selon la revendication 1 ou 2 caractérisée en ce que l'entrefer (A) dans le noyau principal (4) est disposé centralement par rapport à l'enroulement primaire (2).
8. Bobine d'allumage de forte puissance selon la revendication 1, caractérisée en ce que, dans le cas d'un noyau (1) feuilleté à partir de tôles en UU, le noyau comprend deux parties en U identiques.
9. Bobine d'allumage de forte puissance selon la revendication 2 caractérisée en ce que, dans le cas d'un noyau (8) feuilleté à partir de tôles en EE, le noyau comprend deux parties en E identiques.
10. Bobine d'allumage de forte puissance selon la revendication 2 caractérisée en ce que le noyau (14) est réalisé à partir de tôles en UU et d'un noyau principal (4) en 1 magnétisé dans le sens privilégié, qui se raccorde aux tôles en UU avec quatre faces en coin par suite d'une coupe en oblique, et en ce que, au moins sur un côté frontal du noyau principal (4), l'entrefer (Δ) est disposé symétriquement.
11. Bobine d'allumage de forte puissance selon l'une des revendications précédentes, caractérisée en ce que les tôles de noyau sont recuites après le découpage.
EP85109620A 1984-08-03 1985-07-31 Bobine d'allumage de forte puissance Expired - Lifetime EP0173100B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85109620T ATE64036T1 (de) 1984-08-03 1985-07-31 Hochleistungszuendspule.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3428763A DE3428763C2 (de) 1984-08-03 1984-08-03 Hochleistungszündspule
DE3428763 1984-08-03

Publications (4)

Publication Number Publication Date
EP0173100A2 EP0173100A2 (fr) 1986-03-05
EP0173100A3 EP0173100A3 (en) 1987-06-03
EP0173100B1 true EP0173100B1 (fr) 1991-05-29
EP0173100B2 EP0173100B2 (fr) 1996-09-04

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ID=6242350

Family Applications (1)

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EP85109620A Expired - Lifetime EP0173100B2 (fr) 1984-08-03 1985-07-31 Bobine d'allumage de forte puissance

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EP (1) EP0173100B2 (fr)
AT (1) ATE64036T1 (fr)
DE (2) DE3428763C2 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE68906607T2 (de) * 1988-07-28 1993-10-28 Nippon Denso Co Zündspule.
WO1992017892A1 (fr) * 1991-04-01 1992-10-15 Motorola Lighting, Inc. Inducteur
DE19833190A1 (de) * 1998-07-23 2000-01-27 Bayerische Motoren Werke Ag Zündspule
DE102006044436C5 (de) * 2006-09-21 2020-07-30 Robert Bosch Gmbh Vorrichtung zur Energiespeicherung und Energietransformierung
EP3185254A1 (fr) * 2015-12-22 2017-06-28 ABB Schweiz AG Noyau magnétique et transformateur comprenant un noyau magnétique

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB618114A (en) * 1945-10-22 1949-02-16 British Thomson Houston Co Ltd Improvements in and relating to magnetic cores
DE974598C (de) * 1951-04-19 1961-02-23 Siemens Ag Schichtkern fuer Transformatoren, Drosseln und aehnliche Geraete
FR66586E (fr) * 1954-06-16 1957-04-16 App Marchal Soc D Expl Const D Transformateur dit <<bobine>> d'allumage
CH342282A (de) * 1955-06-23 1959-11-15 Licentia Gmbh Aus Rechteckschnitten aufgebauter Kern für magnetische Kreise
DE1255990B (de) * 1959-03-13 1967-12-07 Max Baermann Zuendspule zum Erzeugen elektrischer Funken und Schaltung mit einer solchen Spule
DE1273084B (de) * 1960-02-27 1968-07-18 Vacuumschmelze Ges Mit Beschra Aus Stanzteilen mit magnetischer Vorzugsrichtung geschichteter Magnetkern
DE2057786A1 (de) * 1970-11-24 1972-05-31 Bernhard Philberth Zweiteiliger Kernblechschnitt fuer Transformatoren
JPS524939A (en) * 1975-07-02 1977-01-14 Hitachi Ltd Ignition coil
DE7924989U1 (de) * 1979-09-04 1980-11-13 Brown, Boveri & Cie Ag, 6800 Mannheim Magnetischer Energiespeicher
DE8230848U1 (de) * 1982-11-04 1984-04-12 Robert Bosch Gmbh, 7000 Stuttgart Zur zuendanlage einer brennkraftmaschine gehoerende zuendspule

Also Published As

Publication number Publication date
DE3428763A1 (de) 1986-02-13
EP0173100A3 (en) 1987-06-03
EP0173100B2 (fr) 1996-09-04
ATE64036T1 (de) 1991-06-15
DE3582981D1 (de) 1991-07-04
EP0173100A2 (fr) 1986-03-05
DE3428763C2 (de) 1986-10-02

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