EP0173100A2 - Bobine d'allumage de forte puissance - Google Patents

Bobine d'allumage de forte puissance Download PDF

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Publication number
EP0173100A2
EP0173100A2 EP85109620A EP85109620A EP0173100A2 EP 0173100 A2 EP0173100 A2 EP 0173100A2 EP 85109620 A EP85109620 A EP 85109620A EP 85109620 A EP85109620 A EP 85109620A EP 0173100 A2 EP0173100 A2 EP 0173100A2
Authority
EP
European Patent Office
Prior art keywords
core
ignition coil
preferred direction
magnetized
magnetic
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
Application number
EP85109620A
Other languages
German (de)
English (en)
Other versions
EP0173100B1 (fr
EP0173100A3 (en
EP0173100B2 (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
TSCHUK Robert Ing
BERTOS AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6242350&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0173100(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by TSCHUK Robert Ing, BERTOS AG filed Critical TSCHUK Robert Ing
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
Application granted granted Critical
Publication of EP0173100B2 publication Critical patent/EP0173100B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 metal and air gap and a primary and secondary winding surrounding the main core.
  • 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, at an angle in the magnetic circuit (DE-U-79 24 989), or 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.
  • an undesirable magnetic scattering occurs because the main flux leaves the paths predetermined in the magnetic circuit due to the lower magnetic resistance outside the exciting primary winding.
  • the main magnetic flux is thus no longer completely linked to the individual turns of the primary winding, the yoke legs of the magnetic circuit are no longer fully utilized; the magnetic circuit is locally supersaturated with this arrangement of the air gaps.
  • 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, particularly cobalt samarium, are characterized by a particularly large coercive force 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.
  • 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 without Arrangement of a permanent magnet an unchanged large magnetic energy can be stored and accordingly unchanged performance data of the ignition coil can be provided.
  • 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 cross-sectional area of the parts of the core magnetized transversely to the preferred direction is approximately 1.5 to 1.8 times the cross-sectional area of the main core magnetized in the preferred direction.
  • 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 in the preferred direction, ie the rolling direction of the magnetized parts of the core, only by slightly more material expenditure while increasing the cross-sectional area of the cross parts of the core magnetized in the preferred direction to achieve the same properties and performance data of the ignition coil as can be achieved by attaching a permanent magnet for magnetic biasing.
  • 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 a 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 expediently approximately 1.5 to 1.8 times the width of the main core magnetized in the preferred direction.
  • the height of the yokes magnetized transversely to the preferred direction is advantageously about 0.75 to 0.9 times the width of the main core magnetized in the preferred direction with the same core layer height.
  • the air gap is expediently arranged in the main core approximately in the middle of the primary winding. This brings in particular the The advantage of optimal dissipation of the heat generated over the main core and the entire core.
  • a further development of the invention consists in the fact that in the case of a core layered from EI sheets 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 about 0.5 times the width of the main core magnetized in the preferred direction.
  • 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.
  • a permanent magnet is inserted in the air gap for the purpose of magnetically biasing the magnetic circuit. With full use of material and balance in all magnetic sections of the core with regard to the magnetization with respect to the preferred direction of the core material, this can either further increase the performance data of the ignition coil, or less material can be used if the performance data remain unchanged.
  • 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 w 1 and a secondary winding 3 with the number of turns w 2 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 preferred magnetic direction.
  • An air gap ⁇ 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 c / 2 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 I-sheets that 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 ⁇ 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 ⁇ , the main seat of the magnetic field.
  • the magnetic field is an energy store. According to the theory, the total in the magnetic field is one of the current I current flowing through the coil
  • the inductance L is constant and 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 more magnetization than 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.
  • this type of electrical sheet it becomes magnetic material with a pronounced preferred direction, for example grain-oriented sheet metal with the preferred direction in the rolling direction applied, so that the part of the magnetic circuit carrying the main magnetic flux can be subjected to a specific high load, those parts of the core sheet in which the magnetic flux has to be driven transversely to the rolling direction require a correspondingly high magnetization requirement.
  • the magnetization requirement H (A / cm) is assigned to the specific material stress, the magnetic induction B (T), for a commercially available grain-oriented sheet according to DIN 40600.
  • Curve a) shows the magnetization requirement in the rolling direction, curve b) transverse to the rolling direction.
  • the magnetization requirement and the saturation properties of this material both in the rolling direction and in the direction transverse to the rolling direction are illustrated by the curves a) and b) of the relative permeability g r : In the rolling direction, the relative permeability is approximately 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 inductor, 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 portions 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).
  • approximately 1.8 A / cm are required (point B).
  • the entire magnetic circuit is approximately balanced in terms of magnetization if approximately the same magnetization requirement is applied to those parts of the magnetic circuit which are magnetized in the rolling direction.
  • 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.
  • 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 ⁇ 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 the saturation in the magnetic sections with the magnetization transverse to the rolling direction is reached. With the further increase The magnetic flux of the current hardly increases, the characteristic curve is strongly curved.
  • there is a directly proportional relationship at the maximum coil current to be applied so that the maximum magnetic energy at this current of the ignition coil ( Permanent magnet) can be saved.
  • 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 manufacture is considerably simplified because no increased care and attention is devoted to the correct installation and correct polarization of the brittle permanent magnet must become.
  • 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 a permanent magnet, 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
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 true EP0173100A2 (fr) 1986-03-05
EP0173100A3 EP0173100A3 (en) 1987-06-03
EP0173100B1 EP0173100B1 (fr) 1991-05-29
EP0173100B2 EP0173100B2 (fr) 1996-09-04

Family

ID=6242350

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85109620A Expired - Lifetime EP0173100B2 (fr) 1984-08-03 1985-07-31 Bobine d'allumage de forte puissance

Country Status (3)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3185254A1 (fr) * 2015-12-22 2017-06-28 ABB Schweiz AG Noyau magnétique et transformateur comprenant un noyau magnétique

Families Citing this family (4)

* 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

Citations (6)

* 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
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
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

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE974598C (de) * 1951-04-19 1961-02-23 Siemens Ag Schichtkern fuer Transformatoren, Drosseln und aehnliche Geraete
DE1255990B (de) * 1959-03-13 1967-12-07 Max Baermann Zuendspule zum Erzeugen elektrischer Funken und Schaltung mit einer solchen Spule
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

Patent Citations (6)

* 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
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
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 1, Nr. 51, 18. Mai 1977, Seite 318 M 77; & JP-A-52 004 939 (HITACHI SEISAKUSHO K.K.) 14-01-1977 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3185254A1 (fr) * 2015-12-22 2017-06-28 ABB Schweiz AG Noyau magnétique et transformateur comprenant un noyau magnétique

Also Published As

Publication number Publication date
DE3428763A1 (de) 1986-02-13
EP0173100B1 (fr) 1991-05-29
EP0173100A3 (en) 1987-06-03
EP0173100B2 (fr) 1996-09-04
ATE64036T1 (de) 1991-06-15
DE3582981D1 (de) 1991-07-04
DE3428763C2 (de) 1986-10-02

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