US3889360A - Method for fabricating a choke with adjustable air gap and choke produced thereby - Google Patents

Method for fabricating a choke with adjustable air gap and choke produced thereby Download PDF

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Publication number
US3889360A
US3889360A US368123A US36812373A US3889360A US 3889360 A US3889360 A US 3889360A US 368123 A US368123 A US 368123A US 36812373 A US36812373 A US 36812373A US 3889360 A US3889360 A US 3889360A
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US
United States
Prior art keywords
ballast
roller
air gap
choke
hood
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
US368123A
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English (en)
Inventor
Ernst Meili
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.)
F Knobel Elektro Apparatebau AG
Original Assignee
F Knobel Elektro Apparatebau 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
Priority claimed from CH866872A external-priority patent/CH532825A/de
Application filed by F Knobel Elektro Apparatebau AG filed Critical F Knobel Elektro Apparatebau AG
Application granted granted Critical
Publication of US3889360A publication Critical patent/US3889360A/en
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
    • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
    • H01F27/266—Fastening or mounting the core on casing or support
    • 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
    • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
    • H01F27/263—Fastening parts of the core together
    • 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
    • H01F38/08—High-leakage transformers or inductances
    • H01F38/10—Ballasts, e.g. for discharge lamps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49004—Electrical device making including measuring or testing of device or component part

Definitions

  • ABSTRACT A method for fabricating a choke wherein the air gap provided with an insert can be adjusted by core portions displaceable relative to one another. The relatively displaceable core portions are clamped between a floor with upstanding side edges and a resilient hood having sidewalls, the hood being displaceable towards the floor. After adjusting the desired air gap the sidewalls of the hood are fastened as by welding with the side edges of the floor, so that the air gap insert is continuously maintained under a constant stress or load.
  • the present invention relates to a new and improved method of fabricating a choke in which the air gap provided with an insert is adjustable by core portions which are displaceable with respect to one another.
  • the air gap insert consisting of nonmagnetic material is squeezed together to the desired thickness during the tuning operation and thus forms a fixed support for the air gap.
  • This support is only effective when the insert is continuously maintained under pressure, wherefore the choke must be provided with a resilient element which, following tuning, maintains the insert under pressure.
  • the air gap can be adjusted within wide limits without changing magnetic parts, housing parts, and the like.
  • a resilient floor portion is engaged with a magnetic core. Since in this case, however, the floor portion only possesses an extremely small spring deflection or displacement path the air gap cannot be varied or adjusted within wide limits. For each desired air gap thickness there is thus required a change of the floor.
  • Another object of the present invention relates to chokes fabricated in accordance with the method aspects of this invention.
  • the method of this development for the fabrication of a choke of the previously mentioned type is manifested by the features that the core portions which are displaceable relative to one another are clamped between a floor having upstanding side edges and a resilient hood which is displaceable towards the floor and which hood has side walls. following adjustment of the desired air gap the sidewalls of the hood are welded with the side edges of the floor, so that the air gap insert is continuously maintained under a constant stress or load.
  • the upper wall of the hood which ascends to both sides from its central region, during clamping together of the hood and floor, is pressed flat in order to exert a predetermined pressure upon the air gap insert.
  • the undesired afterflow or post-flow of the material amounts to approximately 5 to 10% of the strived for impedance.
  • the postflow of material is also dependent upon the thickness of the squeezed or clamped insert, so that during pronounced squeezing this post-flow effect is correspondingly greater. In any case there arises an impedance error which is in the order of several percent, for instance about 57? in a stray field, a value impermissibly high for precision chokes.
  • the problem of the flow of the air gap material can be overcome if the air gap insert is subjected to a vibrational force or impacts for such length of time until the desired impedance value has been attained.
  • the technique employing impacts is not practical since it is much too slow.
  • the use of a vibrating force does indeed allow for very rapid tuning, however it is practically impossible to suddenly interrupt the tuning operation when the desired impedance value has been reached, so that here also there remains a certain disturbing residual error.
  • the choke after setting or adjustment of the air gap and welding of the side walls of the hood with the side edges of the floor is inserted into a tuning device in which a roller acts with adjustable pressure upon the choke and the roller or the choke are displaced in the lengthwise direction of the choke, so that the insert is continuously squeezed or compressed due to the rolling motion of the roller upon the choke.
  • the pressure on the roller of an impedance measuring device connected with the choke is controlled such that upon reaching the reference or rated value, the pressure acting upon the roller is diminished and there is obtained an exact fine tuning of the choke.
  • Squeezing or compression of the air gap insert therefore in this case does not occur through simultaneous compression or impacting along the entire length of the choke, rather by a rolling action undertaken by a roller so that the pressure, by means of which the wire is squeezed or compressed together, progresses along the wire and upon cessation of the pressure there is attained an exact fine tuning with an impedance error of less than 1%.
  • FIG. 1 is a longitudinal sectional view of a choke fab- I used in the fabrication of the choke prior to assembly of the choke;
  • FIG. 4 is a perspective view of a choke produced according to the method aspects of the invention.
  • FIG. Si is a cross-sectional view of the choke depicted -in FIG. 4 together with a roller acting upon the choke for fine tuning;
  • FIG. 6 illustrates details of a tuning device for the choke for carrying out certain aspects of the method of this invention.
  • FIGS. 1 and 2 the exemplary embodiment of choke depicted in FIGS. 1 and 2 will be recognized to comprise three core portions or components 1, 2 and 3 and a coil 4.
  • the core portion 3 is displaceable relative to the core portions 1 and 2 in order to be able to adjust the air gap 5 located therebetween.
  • an insert which here is shown to consist of two lacquer coated copper wires 6, which for the'purpose of facilitating assembly, are fixed upon an adhesive foil 7.
  • the core portions 1, 2 and 3 are clamped between a floor or bottom 8 having upstanding side edges 9 and a hood 10 with side walls 11.
  • the upper wall of the hood 10 Prior'to assembly of the choke, ascends or slopes upwardly to both sides from the center of such hood.
  • this upper wall of the hood is pressed flat, and due to the resilient action'of the hood a certain pressure is exerted upon theair gap insert, that is the copper wires 6, so that a desired air gap and therefore a desired impedance of the choke can be adjusted.
  • the side walls of the hood are fastened as by'welding with the side edges of the floor, to which end there is preferably employed a projection or bulge weld.
  • the air gap insert is continuously maintained under constant load or stress.
  • the choke is mounted upon a carriage 12 which is lengthwise displaceable along a support 13.
  • a piston rod 14 Operatively connected with the carriage 12 is a piston rod 14, the piston 15 of which is displaceable within a cylinder 16.
  • Conduits or lines 17 and 18 are operatively connected with the cylinder 16.
  • a roller or roll 19 acting upon the hood 10 of the choke is mounted by means of a shaft 20 at one arm of the angle lever 21.
  • This angle lever 21 is rotatably mounted about a pivot pin 22 at a bracket 23 of a column 24.
  • a piston rod 26 engages through the agency of a pin at the end of the other arm of the angle lever 21.
  • the piston 27 of the piston rod 26 travels in a cylinder 28 at which there is also connected two conduits or lines 29 and 30.
  • tuning device is additionally equipped with a contact mechanism 31 at which there are automatically connected the contact tabs or plugs 32 of the choke coil 4 upon insertion of the choke.
  • Conductors 33 lead from I the contact mechanism 31 to any suitable and therefore merely schematically illustrated impedance measuring instrument or device 50, by means of which there can be controlled the infeed of compressed air or oil or some other suitable pressurized medium to the cylinder 28.
  • the piston 15 is displaced in the direction of the arrow and the choke is drawn through or displaced beneath the roller or roll 19, wherein the length of the path through which the choke moves corresponds to the length of a squeezed together wire section. Due to the continuous squeezing of the copper wires 6 the size of the air gap 5 and therefore the impedance of the coil 4 is continuously changed. If the impedance of the choke has'attai ned a predetermined value then due to the action of the impedance measuring device 50 the pneumatic or hydraulic piston 26 is reversed, so that the roller 19 is raised from the choke and the impedance is no longer altered.
  • the pressure exerted'upon the roller 19 is advantageously adjusted such that almost the entire length of the wires 6 must'be rolled in order to attain the desired impedance value.'This is undertaken'foi' two reasons: one is to ensure that the thickness of theair gap -.over the entire length of each wire is as constantin size as possibleQin order that the induction in the air gap and in the iron core is asuniform as possible. The other reason concerns the tuning accuracy.
  • the desired impedance-the lengthwise movement of the choke cannot be suddenly stopped and the pressure exerted upon the roller is also not suddenly reduced to null. Due to the thus realized stopping path and the post-flow of the wire material during constant pressure there occurs a compensation error. This compensation error becomes percentually negligible with a long roller path. L v
  • the pressure exerted upon the roller 19 also can be chosen to be so small that a second throughpass of the choke beneath the roll or roller for obtaining the desired impedance value is necessary, whereby'the direction of movement of the piston 15 and the choke, after the first pass, automatically is reversed and the exerted pressure is advantageously increased. AS a result the tuning error can be further reduced. In principle more than two passes are possible, but in actual practice one is generally satisfied with two passes since otherwise the tuning time becomes 'much too long for rational fabrication purposes. Therefore those chokes are rejected which anyway cannot be tuned during a second pass.”As experience has shown such chokes are anyway associated with a manufacturing defect. According to a practical application of the method with the described tuning device there could be obtained cycle times of about 3 seconds.
  • the tuning device is of relatively small constructional size and can be easily incorporated into the manufacturing assembly line.
  • a method for fabricating a ballast wherein the air gap provided with an insert can be adjusted by core portions displaceable with respect to one another comprising the steps of: clamping the relatively displaceable core portions between a floor provided with upstanding side edges and a resilient hood having side walls and which hood can be displaceable in the direction of such floor, adjusting a desired air gap, fastening the side walls of the hood with the side edges of the floor, so that the air gap insert is continuously maintained under a substantially constant stress, the fastening step including welding the side walls of the hood with the side edges of the floor, inserting the ballast into a tuning device after adjustment of the air gap and welding of the side walls of the hood with the side edges of the floor, applying a roller of the tuning device so as to act upon the ballast with adjustable pressure, effecting relative displacement between the roller and the ballast in the lengthwise direction of the ballast, to thereby continuously squeeze together the insert by the rolling motion of the roller at the ballast, and controlling the pressure at the roller by an im

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Braking Arrangements (AREA)
  • Body Structure For Vehicles (AREA)
  • Wire Processing (AREA)
US368123A 1972-06-09 1973-06-08 Method for fabricating a choke with adjustable air gap and choke produced thereby Expired - Lifetime US3889360A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH866872A CH532825A (de) 1972-06-09 1972-06-09 Verfahren zur Herstellung einer Drossel mit einstellbarem Luftspalt
CH69873A CH539935A (de) 1972-06-09 1973-01-18 Verfahren zur Herstellung einer Drossel mit einstellbarem Luftspalt

Publications (1)

Publication Number Publication Date
US3889360A true US3889360A (en) 1975-06-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
US368123A Expired - Lifetime US3889360A (en) 1972-06-09 1973-06-08 Method for fabricating a choke with adjustable air gap and choke produced thereby

Country Status (13)

Country Link
US (1) US3889360A (xx)
JP (1) JPS4950453A (xx)
AU (1) AU475395B2 (xx)
CA (1) CA991387A (xx)
CH (1) CH539935A (xx)
DE (1) DE2323266C2 (xx)
ES (1) ES414901A1 (xx)
FR (1) FR2188271B1 (xx)
IL (1) IL42370A (xx)
IT (1) IT986143B (xx)
NL (1) NL7307202A (xx)
NO (1) NO132887C (xx)
SE (1) SE379115B (xx)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4241484A (en) * 1978-11-07 1980-12-30 Chrysler Corporation Method for assembling a fuel pump and motor
US4443934A (en) * 1982-10-04 1984-04-24 General Electric Company Method of assembling permanent magnet dc machines
AU675238B2 (en) * 1992-08-28 1997-01-30 Tridonic Bauelemente Gmbh Adjustable-impedance choke coil

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1107367B (it) * 1978-07-21 1985-11-25 Gd Spa Magazzino a capacita variabile per elementi a forma di barretta particolarmente sigarette
JPS55151307A (en) * 1979-05-14 1980-11-25 Victor Co Of Japan Ltd Closed magnetic circuit device
FR2457552A1 (fr) * 1979-05-23 1980-12-19 Radiotechnique Procede d'elaboration du noyau magnetique d'une bobine, notamment pour circuit a frequence intermediaire d'un televiseur, et bobine ainsi realisee
US4591819A (en) * 1985-03-28 1986-05-27 Rca Corporation Inductance adjustment for transformers

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2064772A (en) * 1932-06-21 1936-12-15 Ferrocart Corp Of America High-frequency coil with adjustable inductance value
US2674721A (en) * 1951-05-15 1954-04-06 Joyce J Jackson Variable gap width control for television horizontal sweep transformers
US2835876A (en) * 1950-08-18 1958-05-20 Hammond Organ Co Adjustable inductance
US3267400A (en) * 1963-09-19 1966-08-16 United Transformer Corp Variable inductance device
US3619434A (en) * 1968-06-14 1971-11-09 Western Electric Co Method of adjusting the airgap of and finally assembling electrical transducers of the central armature receiver type
US3622928A (en) * 1970-06-29 1971-11-23 Harry P Lee Transformer core with adjustable airgap

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1275680B (de) * 1962-06-22 1968-08-22 May & Christe G M B H Transfor Eisengeschlossene Drossel bzw. Transformator in langgestreckter Form fuer Gasentladungslampen
DE1638339A1 (de) * 1967-07-01 1970-06-18 Knobel Dubs Fritz Magnetkern
CH482275A (de) * 1967-10-23 1969-11-30 Leuenberger H Verfahren zur Herstellung einer Drossel oder eines Transformators

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2064772A (en) * 1932-06-21 1936-12-15 Ferrocart Corp Of America High-frequency coil with adjustable inductance value
US2835876A (en) * 1950-08-18 1958-05-20 Hammond Organ Co Adjustable inductance
US2674721A (en) * 1951-05-15 1954-04-06 Joyce J Jackson Variable gap width control for television horizontal sweep transformers
US3267400A (en) * 1963-09-19 1966-08-16 United Transformer Corp Variable inductance device
US3619434A (en) * 1968-06-14 1971-11-09 Western Electric Co Method of adjusting the airgap of and finally assembling electrical transducers of the central armature receiver type
US3622928A (en) * 1970-06-29 1971-11-23 Harry P Lee Transformer core with adjustable airgap

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4241484A (en) * 1978-11-07 1980-12-30 Chrysler Corporation Method for assembling a fuel pump and motor
US4443934A (en) * 1982-10-04 1984-04-24 General Electric Company Method of assembling permanent magnet dc machines
AU675238B2 (en) * 1992-08-28 1997-01-30 Tridonic Bauelemente Gmbh Adjustable-impedance choke coil

Also Published As

Publication number Publication date
NO132887C (xx) 1976-01-21
IL42370A (en) 1975-11-25
CA991387A (en) 1976-06-22
CH539935A (de) 1973-07-31
FR2188271B1 (xx) 1978-06-30
JPS4950453A (xx) 1974-05-16
IT986143B (it) 1975-01-20
AU5682573A (en) 1974-12-12
IL42370A0 (en) 1973-07-30
AU475395B2 (en) 1976-08-19
NL7307202A (xx) 1973-12-11
FR2188271A1 (xx) 1974-01-18
DE2323266C2 (de) 1982-06-16
DE2323266A1 (de) 1973-12-20
NO132887B (xx) 1975-10-13
ES414901A1 (es) 1976-02-01
SE379115B (xx) 1975-09-22

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