EP0005386B1 - Induktanz mit Ferritschalenkern und Verfahren zum Einstellen des magnetsichen Widerstands des Kerns - Google Patents

Induktanz mit Ferritschalenkern und Verfahren zum Einstellen des magnetsichen Widerstands des Kerns Download PDF

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Publication number
EP0005386B1
EP0005386B1 EP19790400217 EP79400217A EP0005386B1 EP 0005386 B1 EP0005386 B1 EP 0005386B1 EP 19790400217 EP19790400217 EP 19790400217 EP 79400217 A EP79400217 A EP 79400217A EP 0005386 B1 EP0005386 B1 EP 0005386B1
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EP
European Patent Office
Prior art keywords
magnetic circuit
inductance
reluctance
value
adjustment
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
Application number
EP19790400217
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English (en)
French (fr)
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EP0005386A1 (de
Inventor
Alexis Nepomiastchy
Robert Le Dosseur
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.)
Societe Anonyme de Telecommunications SAT
Original Assignee
Societe Anonyme de Telecommunications SAT
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
Application filed by Societe Anonyme de Telecommunications SAT filed Critical Societe Anonyme de Telecommunications SAT
Publication of EP0005386A1 publication Critical patent/EP0005386A1/de
Application granted granted Critical
Publication of EP0005386B1 publication Critical patent/EP0005386B1/de
Expired legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H01F17/043—Fixed inductances of the signal type  with magnetic core with two, usually identical or nearly identical parts enclosing completely the coil (pot cores)
    • 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
    • H01F27/42—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils

Definitions

  • the present invention relates to an inductor comprising a magnetic circuit shaped as a ferrite pot constituted by the superposition of two half-shells and provided with an air gap in its central core. It also relates to the method for adjusting the reluctance of the ferrite magnetic circuit of the inductor in order to give it a desired reluctance value.
  • the effective value of their air gaps is modified.
  • the adjustment is obtained by modifying the passage section and the distribution of the lines of magnetic force in the area of the air gap.
  • each half-shell has a base surmounted by a more or less hollowed out outer crown and a central core.
  • the height of the outer crown is significantly greater than that of the central core.
  • the central core includes a cylindrical chimney allowing the rotational movement and the translation of a ferrite rod secured to a screw, called a screw. adjustment, movable in a nut integral with one of the two half-shells. The positioning of the ferrite rod in the vicinity and / or more or less within the air gap of the magnetic circuit provides adjustments with an accuracy of the order of 10- 4 and a conventional margin setting 15 %.
  • the present invention aims to overcome the drawbacks mentioned above by providing an inductor whose reluctance adjustment of the magnetic circuit to a desired value is obtained by machining and removal of material at least in one of the facing surfaces of the central core forming the air gap of the magnetic circuit. This surface modification results in a modification of the distribution of the magnetic force lines and an increase in the reluctance of the magnetic circuit.
  • the adjustment method according to the invention does not use a stick which is introduced more or less into the air gap using an adjustment screw and eliminates all the drawbacks inherent in said screw adjustment. Additionally, the absence of a central chimney along the core of a magnetic circuit according to the invention improves the qualities of the magnetic circuit.
  • an inductor of the type defined in the entry into material is characterized, in accordance with the invention, in that at least one of the two shells which are assembled and immobilized by gluing or stapling, comprises in the vicinity from the air gap a thin wall pierced with one or more holes determining the value of the reluctance of the magnetic circuit.
  • the present invention therefore remedies these drawbacks in order to allow an almost punctual modification of at least one of the faces of the air gap and, consequently, obtaining the desired characteristic of the inductor with high precision.
  • the method for adjusting the reluctance of the ferrite magnetic circuit of the inductor according to the invention is characterized in that the value of the reluctance of the magnetic circuit to be adjusted is measured, in that the reluctance values are successively compared measured at the desired reluctance value to determine the quantity of material from the thin wall which must be removed and in that this quantity of material is removed by digging and drilling one or more holes through said wall.
  • the digging and drilling of the holes are obtained by machining by means of a laser source, the laser beam of which has an orientation, an intensity, an operating time and a convergence which are determined by a computer as a function of the desired reluctance value. for the magnetic circuit.
  • a laser beam makes it possible to obtain quasi-punctual machining at the level of the air gap, on a very small surface, and therefore a very precise reluctance value.
  • an automatic machine is advantageously used for adjusting the reluctance of magnetic circuits comprising, in addition to the laser source for machining the thin wall, a computer comprising an apparatus for measuring a significant parameter of the reluctance of the magnetic circuit and a computer.
  • the measuring device may be a self-inductance or frequency measuring device.
  • a A1 be the variation of self-inductance produced by the drilling of a hole of diameter 0.
  • the elementary variation A A1 is proportional to the square of the diameter of the hole.
  • the total variation ⁇ A A1 due to the drilling of several holes having diameters 0 1 , 0 3 ..., 0n is proportional to the sum of the squares of these diameters:
  • k is a proportionality coefficient, the value of which depends on the parameters of the ferrite magnetic circuit.
  • the relative value of the setting ⁇ A1 / A1 can be very large, 25% and more; it suffices for this, according to the invention, to give the thin adjustment wall a dimension accordingly and to make in said wall one or more holes having more or less large diameters.
  • the invention can be used for magnetic ferrite circuits whose relative setting value is of the order of 10% of their self-inductance coefficients.
  • the adjustment method according to the invention achieves a high control accuracy, of the order of 10- 4, and even better if necessary because it is possible to assay very finely the amount of material removed by the action of a laser beam.
  • the adjustment process according to the invention is very rapid. This process does not use any mechanical movement in the magnetic circuit.
  • the rate of adjustment of the magnetic circuits can be very large, of the order of one circuit adjusted per second.
  • Another advantage of the magnetic circuit according to the invention and of its adjustment method lies in its high reliability.
  • the circuit according to the invention comprising no additional part, the relative precision of which can be modified after adjustment, for example under the action of temperature or vibrations, is very reliable.
  • Fig. 1 shows a sectional view of a magnetic circuit according to the invention which consists essentially of a pot formed by a upper half-shell 2 which are made of ferrite.
  • the two half-shells 1 and 2 are assembled and immobilized by gluing or stapling at the surfaces opposite their crowns 1 'and 2', after introduction of the coil 6 into the cavity of the magnetic circuit.
  • the two half-shells are not identical.
  • the lower half-shell 1 has a solid central core 1 "while the central core 2" of the upper half-shell 2 has a chimney 3, called an adjustment chimney.
  • the cores 1 "and 2" are coaxial and are separated by an air gap 4.
  • the chimney 3 has the form of a blind hole which is separated from the air gap 4 by a thin wall 5, called the adjustment wall, and which can be, for example, a cylindrical hole coaxial with the central core 2 ".
  • At 6 are shown schematically the winding (s) placed in the cavity of the magnetic circuit.
  • one or more holes, such that 7, are drilled in the adjustment wall 5. This removal of material increases the effective value of the air gap 4.
  • the magnetic circuit according to the invention has substantially the same characteristics as a magnetic circuit of identical dimensions, the central core of which would not include the adjustment chimney 3.
  • Fig. 2 shows a view of the upper face of a magnetic circuit according to the invention. This is more particularly the adaptation of a known circuit to its production according to the invention.
  • FIG. 2 In this figure are represented in 2 the upper half-shell, in 3 the adjustment chimney and in 7 the adjustment hole.
  • a carcass 8 supports the winding (s) 6 and emerges in two places on the magnetic circuit.
  • Fig. 3 schematically represents an automatic machine implementing the adjustment method according to the invention, by means of a laser source.
  • the coil 6 of the magnetic circuit to be adjusted is connected to the measurement input of a self-inductance 10 (or frequency) measuring device.
  • a computer 11 has one of its two inputs connected to the information output of the measuring device and the other input linked to a memory with a prerecorded program 12.
  • This memory 12 has memorized the exact value of the coefficient of self-inductance which must be obtained by adjusting the magnetic circuit.
  • the computer 11 determines, by successive comparisons between the self-inductance values measured and transmitted by the measuring device 10 and the predetermined self-inductance value transmitted by the memory 12, the adjustment parameters of a laser source 14.
  • a link 13 connects the output of the computer 11 and the control input of the laser source 14 for transporting the information necessary for adjusting the parameters of the laser beam admission parameters 15.
  • a laser source 14 provides easy adjustment of a magnetic circuit according to the invention. Indeed, the removal of this ferromagnetic material necessary for said adjustment is carried out on a magnetic circuit provided with its winding and in operation. This means that this adjustment is made in dynamics and can be carried out on an inductor or a transformer comprising said magnetic circuit and interconnected in an electronic circuit in operation. Therefore, the magnetic circuits formed by the inductor or the transformer are adjusted in their normal operating conditions.
  • the material removal method by means of a laser beam does not cause any appreciable disturbance of the ferrite magnetic circuit according to the invention.
  • the adjustment wall 5 of the ferrite magnetic circuit according to the invention allows machining by means of the laser beam 15 which is very localized in space and in time.
  • FIGS. 4a, 4b and 4c represent, by way of example, three examples of configurations which the adjustment wall of a magnetic circuit according to the invention can have, once the adjustment thereof has been carried out.
  • the wall 5a shown in FIG. 4a has been drilled with a single hole 7a whose diameter has been calculated to obtain the pre-determined self-inductance value as accurately as possible.
  • FIG. 4c corresponds to the use by the computer 11 of a program which determines, after each self-inductance measurement, the diameter of the hole 7c to be drilled in order to approach by default the predetermined self-inductance value. It will be appreciated that the holes 7c thus drilled, also centered on a coplanar spiral to the adjustment wall 5c, are becoming smaller.
  • the adjustment method according to the configuration there FIG. 4c contributes both to great speed of execution and to very precise adjustment.
  • the automatic adjustment of self-inductance is carried out with an accuracy of 10 -4 at a rate of a magnetic circuit per second.
  • a magnetic circuit has for example a section of central cores 1 ", 2" of 26 mm 2 , a section of the regulating chimney 3 of 7 mm 2 and a thickness of the regulating wall 5c of 0.3 mm.
  • the machining is carried out by a laser beam whose emission is modulated by pulses with a unit duration of 0.5 ⁇ s. Each pulse allows an erosion of material to a depth of about 50 pm,
  • the half-shells 1 and 2 are different. It is obvious that for multiple reasons, among other reasons of economy, it is possible to combine, to constitute a magnetic circuit, two half-shells of identical structures without thereby departing from the scope of the present invention. In the latter case, the magnetic circuit thus formed is adjusted either simultaneously or alternately, by machining one and / or the other of the adjustment walls of the half-shells.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Soft Magnetic Materials (AREA)

Claims (4)

1. Induktanze mit einem Magnetkreis, der in einer aus zwei übereinandergelegten Ferrit-Halbschalen (1, 2) gebildeten Kammer angelegt und in seinem Mittelkern (1", 2") mit einem Luftspalt (4) versehen ist, dadurch gekennzeichnet, daß von den beiden durch Kleben oder Heften miteinander verbundenen und befestigten Halbschalen mindestens eine (2) eine dünne Wand (5) aufweist, durch welchen eine oder mehrer Löcher (7) zur Bestimmung des Reluktanzwerts des Magnetkreises verlaufen.
2. Verfahren zur Regelung der Reluktanze des Ferrit-Magnetkreises der Induktanz gemäß Patentanspruch 1, dadurch gekennzeichnet, daß der Wert der zu regelnden Reluktanz der Magnetkreises gemessen wird, die Reluktanzmeßwerte anschließend zur Bestimmung der aus der dünnen Wand (5) herauszunehmenden Materialmenge (7) mit dem gewünschten Reluktanzwert verglichen werden, und daß diese Materialmenge durch Ausstechen und Bohren eines oder mehrerer Löcher (7) in diese dünne Wand (5) beseitigt wird.
3. Verfahren gemäß Patentanspruch 2, dadurch gekennzeichnet, daß die Löcher (7) durch Bearbeitung mit einer Laserstrahlquelle (14) eingebracht werden, deren Laserstrahl (15) in seiner Ausrichtung, Stärke, Betriebsdauer und Konvergenz aufgrund des für den Magnetkreis gewünschten Reluktanzwertes durch einen Rechner (10, 11, 12) bestimmt wird.
4. Verfahren gemäß Patentanspruch 2 oder 3, dadurch gekennzeichnet, daß die Messung des Reluktanzwertes des Magnetkreises in einer Selbstinduktanz- oder Frequenzmessung besteht, die auf die Induktanze oder das den Magnetkreis aufweisende Transformator einwirkt, wobei diese Induktanz oder dieses Transformator in enem elektronischen Normalbetriebskreis geschaltet is.
EP19790400217 1978-04-06 1979-04-03 Induktanz mit Ferritschalenkern und Verfahren zum Einstellen des magnetsichen Widerstands des Kerns Expired EP0005386B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7810188A FR2422235A1 (fr) 1978-04-06 1978-04-06 Nouveau circuit magnetique en ferrite et procede de reglage de ce circuit
FR7810188 1978-04-06

Publications (2)

Publication Number Publication Date
EP0005386A1 EP0005386A1 (de) 1979-11-14
EP0005386B1 true EP0005386B1 (de) 1981-09-02

Family

ID=9206759

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19790400217 Expired EP0005386B1 (de) 1978-04-06 1979-04-03 Induktanz mit Ferritschalenkern und Verfahren zum Einstellen des magnetsichen Widerstands des Kerns

Country Status (7)

Country Link
EP (1) EP0005386B1 (de)
JP (1) JPS54136654A (de)
CA (1) CA1120998A (de)
DE (1) DE2960720D1 (de)
ES (1) ES479328A1 (de)
FR (1) FR2422235A1 (de)
YU (1) YU81379A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0068745A1 (de) * 1981-06-19 1983-01-05 TDK Corporation Ferritkern und Vorrichtungen, die solche Kerne aufweisen

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1540675A4 (de) * 2002-09-17 2009-11-11 Pulse Eng Inc Einrichtung und verfahren für gesteuerte induktivität
JP5662255B2 (ja) * 2010-07-21 2015-01-28 株式会社神戸製鋼所 リアクトル

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1208425B (de) * 1959-01-14 1966-01-05 Int Standard Electric Corp Verfahren zum Induktivitaetsabgleich von Ferrit-Schalenkernspulen
FR1523460A (fr) * 1967-03-24 1968-05-03 Lignes Telegraph Telephon Bobine à noyau ferromagnétique d'inductance réglable
US3548492A (en) * 1967-09-29 1970-12-22 Texas Instruments Inc Method of adjusting inductive devices
US3670406A (en) * 1970-02-04 1972-06-20 Texas Instruments Inc Method of adjusting inductive devices
DE2548059A1 (de) * 1975-10-27 1977-04-28 Siemens Ag Elektrischer lc-schwingkreis

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0068745A1 (de) * 1981-06-19 1983-01-05 TDK Corporation Ferritkern und Vorrichtungen, die solche Kerne aufweisen

Also Published As

Publication number Publication date
CA1120998A (en) 1982-03-30
ES479328A1 (es) 1979-12-16
FR2422235B1 (de) 1981-09-11
YU81379A (en) 1983-04-30
JPS54136654A (en) 1979-10-23
FR2422235A1 (fr) 1979-11-02
EP0005386A1 (de) 1979-11-14
DE2960720D1 (en) 1981-11-26

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