EP0230185B1 - Procédé de réalisation de circuits magnétiques pour selfs de stabilisation destinées à un ensemble de lampes à décharge différentes - Google Patents

Procédé de réalisation de circuits magnétiques pour selfs de stabilisation destinées à un ensemble de lampes à décharge différentes Download PDF

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Publication number
EP0230185B1
EP0230185B1 EP86402810A EP86402810A EP0230185B1 EP 0230185 B1 EP0230185 B1 EP 0230185B1 EP 86402810 A EP86402810 A EP 86402810A EP 86402810 A EP86402810 A EP 86402810A EP 0230185 B1 EP0230185 B1 EP 0230185B1
Authority
EP
European Patent Office
Prior art keywords
air gap
lamps
minimum
magnetic
group
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
EP86402810A
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German (de)
English (en)
French (fr)
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EP0230185A1 (fr
Inventor
Pierre Tarroux
Gérard Masclaux
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.)
Thorn Europhane SA
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Thorn Europhane
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Filing date
Publication date
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Priority to AT86402810T priority Critical patent/ATE91565T1/de
Publication of EP0230185A1 publication Critical patent/EP0230185A1/fr
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Publication of EP0230185B1 publication Critical patent/EP0230185B1/fr
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
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • H01F3/14—Constrictions; Gaps, e.g. air-gaps
    • 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

Definitions

  • the present invention relates to magnetic circuits for producing chokes for stabilizing the operation of discharge lamps.
  • the inductance of a choke strongly depends on the width of the air gap.
  • the reluctance, or magnetic resistance is in the form l / ps in which l represents the length of the circuit element (iron or air) in the direction of the flux lines, s the section of the circuit and p magnetic permeability.
  • inductors such as those used to stabilize the operation of discharge lamps, we see that the reluctance of the magnetic circuit (path in the iron) represents only 2 to 5% of the reluctance of the air gap (path in air ). Also, the inductance of the inductors can be modified to a large extent by acting only on the value of the air gap.
  • each lamp corresponds to a particular ideal inductance of the stabilizing inductor. If you want to make all the chokes in the most economical way in terms of materials, you can think of using magnetic circuits of the same dimensions and vary the air gap. Ideally, the air gap should even be continuously variable not only to obtain different predetermined inductance values, but also to compensate for the tolerances on the other parameters influencing the value of the inductance, namely in particular the number of turns, the permeability of magnetic materials and the flow passage section.
  • inductors with an adjustable air gap there are numerous examples in the electrotechnical art of making inductors with an adjustable air gap. Of a generally, it is expected that a part of the magnetic circuit can move relative to a part of the complementary circuit.
  • the air gap is adjusted by continuously measuring the current passing through the winding under the effect of a constant supply voltage. When this current has reached a predetermined set value, the two parts of the magnetic circuit are immobilized relative to each other by mechanical means.
  • a machine In a mass production process, a machine must be produced capable of imparting a slow movement and of small amplitude to the parts of the magnetic circuit movable with respect to each other, of continuously measuring the current passing through. winding and ensuring the locking in position of the parts of the magnetic circuit. Such a machine is necessarily complicated and expensive, especially if it requires a high production rate.
  • the magnetic circuit is formed by assembling first magnetic circuit elements defining an air gap minimum and second magnetic circuit elements defining a maximum air gap.
  • the step gap variation is achieved by modifying the relative proportions of first and second magnetic circuit elements.
  • Document AU-A-518 715 shows a magnetic circuit for discharge lamp stabilization inductor, formed of first and second magnetic circuit elements arranged alternately and defining two respective air gap values different from each other.
  • the object is not to vary the overall value of the air gap, but to obtain two elbows in the characteristic curve of the choke representing the variation of the current with respect to the voltage.
  • the present invention aims to provide a method for making magnetic circuits having different air gaps adapted to a set of different discharge lamps, without requiring the use of complex machines or fixtures to adjust the relative position of parts of magnetic circuit .
  • the magnetic circuits of the different inductors are formed by two stacks of magnetic sheets located on either side of a joint plane and the sheets used for at least one of the two stacks have a partial air gap with respect to the joint plane. having one or the other of two different values forming the minimum and maximum air gaps with the partial air gap defined by the sheets of the other stack.
  • the two different values of partial air gap can be obtained with particular sheets, which leads, to produce one of the stacks of the different chokes, to use sheets of two different types.
  • the two different partial air gap values can be obtained with the same sheets, one or the other of the two values being obtained depending on whether the magnetic sheets have one or the other on two opposite sides in look of the other stacking.
  • the method according to the invention makes it possible to cover at least approximately the air gap requirements for a whole set of different discharge lamps without requiring adjustments of relative positions of parts of magnetic circuits and without requiring a large assortment of magnetic sheets. of different types.
  • an ideal air gap of the magnetic circuit of the lamp stabilization inductor that is to say an air gap corresponding to a maximum saving in terms of materials. used for the construction of the reactor (iron and copper).
  • air gap adjustment machines or complete series of different magnetic circuits can be used. each corresponding to a particular lamp, but the resulting additional cost can largely cancel out the savings made on materials.
  • the invention proceeds from an observation made by the applicant. It has indeed appeared that the requirements for different air gaps for a range of manufacturing of different discharge lamps can be satisfied, at least approximately, with a minimum air gap value suitable for one or more lamps, a maximum value of air gap suitable for one or more other lamps and at least one intermediate air gap value to cover the needs of the remaining lamps.
  • the minimum and maximum air gap values can be obtained respectively by first and second elements of magnetic circuits while the or each intermediate value is obtained by combining the minimum and maximum values, that is to say by associating first and second magnetic circuit elements.
  • magnetic circuits for manufacturing the stabilization inductors suitable for all the lamps considered can be produced from a reduced number of elements of different magnetic circuits and without requiring continuous adjustment of the gap width.
  • FIG. 1 shows a diagram or "air gap map" showing the different air gap values optimized for stabilization inductors intended for a set of discharge lamps corresponding to a production range. of the plaintiff.
  • the discharge lamps and the corresponding air gaps shown in this diagram are as follows:
  • these different air gaps can be obtained with a very small assortment of different sheets, for example by means of sheets identical to the gap apart .
  • the intermediate air gap has the average value between the minimum and maximum air gaps.
  • the intermediate air gap could take another value included in the interval between the minimum and maximum air gaps. It is also possible that circumstances impose the choice of more than one intermediate value so that the difference between each optimized air gap and the closest minimum, maximum or intermediate air gap remains less than a certain value (for example to limit the error on the real air gap compared to the value optimized to a few percent, less than 5% for information).
  • Figures 2 to 4 illustrate an embodiment of three magnetic circuits 10, 20, 30 corresponding to the determined air gap values 2a, 2b and a + b.
  • the magnetic circuit 10 (FIG. 2) is formed of two stacks 11, 15 located on either side of a joint plane P.
  • the stack 11 is produced in a conventional manner by means of identical sheets 12 in the form of E
  • the stacking 15 is produced by means of identical sheets 16 in the form of E.
  • the sheets 16 have lateral branches which bear at their ends on the ends of the lateral branches of the sheets 12, along the plane P
  • the magnetic circuit 20 (FIG. 3) is formed by two stacks 21, 25 situated on either side of a joint plane P 'and produced by means of sheets 22, 26, respectively.
  • the sheets 22 and 26 delimit by their central branches a gap of width 2b formed by a partial gap e'1 between the central branches of the sheets 22 and the joint plane P 'and a partial gap e'2 between the central branches of the sheets 26 and the joint plane P '.
  • We then have '1 + e'2 2b .
  • the sheets 22 are chosen identical to the sheets 12 in order to limit the assortment of different magnetic sheets intended for the manufacture of the different inductors.
  • the magnetic circuit 30 (FIGS. 4 and 5) is formed, like the circuits 10 and 20, of two stacks 31, 35 situated on either side of a joint plane P ".
  • the elementary air gap e "2 is obtained by a combination of the sheets in the proportion desired to obtain the desired intermediate air gap value. If, as in the example considered, the value of the intermediate air gap is the average between the values minimum and maximum air gaps, the stack 35 is formed, for one half of sheets 16 and, for the other half, of sheets 26. In this stack, the arrangement of sheets 16 and 26 may vary without significantly modifying the electrotechnically equivalent elementary air gap
  • the arrangement shown in FIG. 5 consists in alternating stacking of bundles of sheets 16 and bundles of sheets 26, the number of sheets being the same in the different packs.
  • the sheets 12 and 16 forming the stacks 11 and 15 have different external dimensions, as well as the sheets 22 and 26 forming the stacks 21 and 25.
  • the magnetic circuit corresponding to the intermediate air gap can be produced automatically by alternately supplying packets of sheets 16 and packets of sheets 26 to form the stack 35 (instead of feeding only packets of sheets 16 or only packets of sheets 26 for the formation of stacks 15 and 25). This remains true in the case where the intermediate air gap (s) have values other than the average between the minimum and maximum air gaps, the only difference being that the sheets 16 and 26 are in different numbers in the stack 35.
  • Figures 6 to 9 illustrate three other embodiments of magnetic circuits 40, 50, 60 respectively offering a minimum air gap, a maximum air gap and an intermediate air gap.
  • the magnetic circuit 40 (FIG. 6) comprises two stacks 41, 45 situated on either side of a joint plane Q.
  • the stack 41 is constituted by sheets 42 in the form of E, while the sheets 46 constituting the stack 45 have, facing the sheets 42, a straight edge 47 located in the joint plane Q.
  • the partial air gap defined by the sheets 46 is zero, and the partial air gap e1 defined by the sheets 42 is equal to the minimum air gap 2a.
  • the magnetic circuit 50 (FIG. 7) also includes two stacks 51, 55 located on either side of a joint plane Q '.
  • the stack 55 is formed of sheets 56 identical to the sheets 46 but occupying with respect to the latter an inverted position so as to present their edge 58, opposite the edge 57, opposite the sheets 52.
  • the sheets 42, 56 have a form in C so that, in the position they occupy in circuit 50, they define a non-zero partial air gap e'2.
  • the design of the magnetic circuits of Figures 6 to 9 is also advantageous in that it allows, as known per se, to draw the sheets 46, 56 without loss of material from the recesses 43 located between the central branch and the branches side of the sheets 42, 52, 62.
  • Tables IV and V show the prices of the materials (iron and copper) required and the resulting cost differences, respectively for the chokes with single imposed air gap and the chokes with optimized air gaps, and for the chokes with single imposed air gap and the chokes with air gaps determined in accordance with the invention.
  • Tables IV and V indicate an annual production quantity and the gain achieved compared to the solution consisting in using inductors with a single imposed air gap. It can be seen that the process according to the invention makes it possible to achieve a very substantial gain in materials (iron, copper) and that this gain is of the same order as that obtained with coils with optimized individual air gaps, but without requiring any equipment. adjustment settings that are expensive and costly to implement.
  • Table III (Chokes with air gaps determined according to the invention) Lamp B AT VS F E D Air gap (mm) 0.850 0.850 0.850 0.957 0.957 0.850 Magnetic circuit thickness ( cm ) 4.7 4.0 3.2 3.8 2.45 1.9 Heat exchange surface (dm2) 3.33 3.12 2.9 3 2.7 2.7 Copper wire diameter (mm) 0.5 0.45 0.40 0.53 0.425 0.375 Number of turns 520 625 799 561 867 1109 Filling coefficient 0.489 0.476 0.480 0.592 0.589 0.586 Copper price (FF) 3.84 3.47 3.19 4.22 3.54 3.27 Iron price (FF) 7.92 6.74 5.39 6.47 4.13 3.20 The annual production for each lamp is shown here as a percentage of total production.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)
  • Magnetic Treatment Devices (AREA)
  • Artificial Filaments (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Magnetic Heads (AREA)
EP86402810A 1985-12-16 1986-12-16 Procédé de réalisation de circuits magnétiques pour selfs de stabilisation destinées à un ensemble de lampes à décharge différentes Expired - Lifetime EP0230185B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86402810T ATE91565T1 (de) 1985-12-16 1986-12-16 Verfahren zur herstellung von magnetkernen in ballastdrosselspulen fuer eine anordnung von verschiedenen entladungslampen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8518630 1985-12-16
FR8518630A FR2591795B1 (fr) 1985-12-16 1985-12-16 Procede de realisation de circuits magnetiques avec entrefer ajustable et circuits magnetiques ainsi obtenus

Publications (2)

Publication Number Publication Date
EP0230185A1 EP0230185A1 (fr) 1987-07-29
EP0230185B1 true EP0230185B1 (fr) 1993-07-14

Family

ID=9325841

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86402810A Expired - Lifetime EP0230185B1 (fr) 1985-12-16 1986-12-16 Procédé de réalisation de circuits magnétiques pour selfs de stabilisation destinées à un ensemble de lampes à décharge différentes

Country Status (6)

Country Link
EP (1) EP0230185B1 (es)
AT (1) ATE91565T1 (es)
DE (1) DE3688704T2 (es)
ES (1) ES2042505T3 (es)
FI (1) FI89217C (es)
FR (1) FR2591795B1 (es)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5441899A (en) * 1992-02-18 1995-08-15 Mitsubishi Denki Kabushiki Kaisha Method of manufacturing substrate having semiconductor on insulator
AU2001293299A1 (en) * 2000-09-20 2002-04-02 Ascom Energy Systems Ag, Berne Planar inductive element

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR579885A (fr) * 1923-05-17 1924-10-25 Reyrolle A & Co Ltd Perfectionnements aux électro-aimants à courant alternatif
US2400559A (en) * 1942-11-25 1946-05-21 Bell Telephone Labor Inc Inductance device
GB684286A (en) * 1949-12-31 1952-12-17 British Thomson Houston Co Ltd Improvements in and relating to core structures for electromagnetic induction apparatus
US2790960A (en) * 1952-01-31 1957-04-30 Westinghouse Electric Corp Core constructions
FR1119363A (fr) * 1954-02-19 1956-06-19 Thomson Houston Comp Francaise Perfectionnements aux réactances à noyau cuirassé
US2934727A (en) * 1955-12-29 1960-04-26 Westinghouse Electric Corp Core construction
US4080725A (en) * 1974-06-26 1978-03-28 Thomas & Skinner, Inc. Ferromagnetic core with variable shunt air gap and method of making it
AU518715B2 (en) * 1977-06-30 1981-10-15 Ferguson Transformers Pty. Ltd. Wattage control ballast

Also Published As

Publication number Publication date
EP0230185A1 (fr) 1987-07-29
FI89217C (fi) 1993-08-25
FI865121A0 (fi) 1986-12-16
DE3688704D1 (de) 1993-08-19
ATE91565T1 (de) 1993-07-15
FR2591795B1 (fr) 1989-01-20
FR2591795A1 (fr) 1987-06-19
DE3688704T2 (de) 1994-02-10
FI865121A (fi) 1987-06-17
FI89217B (fi) 1993-05-14
ES2042505T3 (es) 1993-12-16

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