US3824517A - Inductor having a magnetic casing formed by stacked stampings - Google Patents

Inductor having a magnetic casing formed by stacked stampings Download PDF

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Publication number
US3824517A
US3824517A US00335849A US33584973A US3824517A US 3824517 A US3824517 A US 3824517A US 00335849 A US00335849 A US 00335849A US 33584973 A US33584973 A US 33584973A US 3824517 A US3824517 A US 3824517A
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US
United States
Prior art keywords
core
inductor
stampings
shells
profiles
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
US00335849A
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English (en)
Inventor
J Hess
A Knop
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.)
CONST ELECTROTECHNIQUES DU CER
CONSTRUCTIONS ELECTROTECHNIQUES DU CERTRE FR
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CONST ELECTROTECHNIQUES DU CER
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Filing date
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Priority claimed from FR7206669A external-priority patent/FR2173689B1/fr
Application filed by CONST ELECTROTECHNIQUES DU CER filed Critical CONST ELECTROTECHNIQUES DU CER
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Publication of US3824517A publication Critical patent/US3824517A/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
    • H01F27/245—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
    • 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
    • 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
    • H01F41/0233—Manufacturing of magnetic circuits made from sheets

Definitions

  • An inductor comprises a central core 1 having bevelled upper and lower edges.
  • the core is surrounded by a coil or winding 3, and the magnetic circuit is completed by complimentary half shells 5 and 6 that surround the coil and mate with the bevelled core edges but which are separated therefrom by compressible films 4.
  • Flanged assembly brackets 7 and 8 complete the structure and may be inwardly pinched to compress the films and thereby adjust the inductance value to a desired level.
  • the void spaces 9 and 10 at the top and bottom of the core help to channel the flux through the shells 5 and 6.
  • SHEET 3 [1F 3 INDUCTOR HAVING A MAGNETIC CASING FORMED BY STACKED STAMPINGS
  • the present invention concerns an inductor comprising a winding enclosing a core surrounded by a magnetic casing formed by stampings.
  • Inductors of this type are already known, but none possesses the necessary technical qualities in return for a low cost price.
  • inductors formed by a winding mounted on the vertical portion of a stack of T-shaped stampings, the casing being formed by a stack of U- shaping of the U and T- shaped parts involves wastage of material in the stamping out of sheet metal, thus contributing to an increase in the price.
  • the principal object of the present invention is to provide an inductor formedby a winding mounted on a core and enclosed by a magnetic casing formed by the union of two half-shells disposed edgewise relatively to the core, each half-shell being formed by a stack of stampings located perpendicularly to the axis of the core, the said inductor being characterised in that the said stampings have aninner profile presenting at each end a portion resting over a certain length on an'end of the core, and an end portion separated therefrom, each pair of adjacent ends of the outer profiles of the halfshells being provided with an independent flange covering the corresponding end of the core and connecting the said adjacent ends together in such manner that there is always an empty space defined by each flange, the core and the end portions of the inner profiles of the edgewise stampings contained between the flange and the core.
  • Such an inductor whether it is an induction coil or a transformer, has the advantage of being easily assembled, of reducing the Foucault currents in the casing and facilitating the dissipation of the heat emitted, by the inductor owing to the excellent conduction offered by the stampings of the casing located perpendicularly to the axis of the core.
  • the provision of the empty space between the base, the core and the portions of the inner profiles of the edgewise stampings contained between the flange and the core results in more efficient channelling of the magnetic flux near the end of the core than in previous inductors provided with an outer casing, whilst facilitating the assembly of the half-shells by means of two independentflanges.
  • Another object of the present invention is an inductor of the above type, the stampings of which, forming the half-shells, have an outer profile presenting at each end a projection on which the side edge of each flange rests, at least one of the flanges extending beyond the half-shells to serve as a mounting base.
  • each flange may act as a mounting base of the inductor on any desired device or support and mayalso serve as a support for any desired identifying marks, a need which is frequently imperative for using this type of electric component.
  • Another object of the present invention is also to reduce the cost of manufacture of the inductor by the practically complete elimination of wastage of metal resulting from the formation of the stampings, the stacks of which form the half-shells enclosing the core by the formation of stampings whose outer profile may be juxtaposed with the profile of its inner portion, the edges of the stampings between the ends of these profiles being formed of a straight portion acting as a support for a mounting base of the said inductor.
  • Another object of the present invention is an inductor of this type, each projection of which is formed by an acute angle, one side of which coincides with the straight edge joining the end of the outer profile with the end of the inner profile and the other side of which is equal and parallel to the portion of the inner profile between the core and the flange.
  • Inductors of this type may, under these conditions, be assembled and adjusted very easily, since it is onlynecessary to keep the flanges in contact with the straight portions of the half-shells joining the ends of the inner and outer profiles and to push back, in a single operation, the pre-formed longitudinal edges of the flanges to make them cover the angles provided on the outer profiles of the half-shells.
  • the inductor In order to obtain any desired adjustment, it is only necessary to connect the inductor to the measuring devices, to provide between the end surfaces of the core and the half-shells a compressible material for adjusting the air gap and to press the halfshells, during the covering of the longitudinal edges of the flanges, against the angles provided on the ends of the half-shells until the measuring devices indicate the desired value of the inductor.
  • the resultant excellent positioning makes it possible to avoid any gluingof the half-shells or any longitudinal soldering, whatever the method of constructing the core may be, whether it is formed by a stack of transverse or longitudinal stampings.
  • Another object of the present invention is to improve the magnetic flux circuit by selecting for supporting lengths, edgewise stampings on the ends of the core, a length substantially equal to the widthof these stampings in the median plane parallel to the two flanges.
  • the magnetic circuit may be further improved in cases where the stampings are formed, in order to avoid any useless waste of material during manufacture so that the outer profiles of the stampings are capable of being superimposed on the inner profiles.
  • the straight section offered to the flux is generally very narrow at the level of the supporting point near the winding and in the particular case in which the straight section is constant along the stampings on edge in the form of a square, this special shape imposed on the half-shells cannot correspond to the shape of the desired winding or even to the desired outer shape of the casing.
  • Another object of the present invention is to further improve the magnetic circuit in the case of half-shells,
  • the stampings of which have an inner profile capable of being superimposed on the outer profile along the" edges of the outer profiles by assembling flanges until the side edges of the flanges are beyond the straight section perpendicular to the profile of the stampings passing through the supporting point of the stamping on the core near the winding.
  • the increase in the width of the flanges is utilised, on the one hand, to avoid tearing of the lower flange originally provided to keep the outer stampings of the half-shells in contact and, on the other hand, to provide effective protection for the connecting wires of the inductor by means of the upper base.
  • FIG. 1 is a cross section through an inductor.
  • FIG. 2 is an elevational view of one end of the inductOl',
  • FIG. 3 is-a side view of the inductor
  • FIG. 4 isa cross-section through an inductor having a core formed by transverse stampings
  • FIG. 5 is a cross-section through an inductor having a core comprising longitudinal stampings
  • FIGS. 6 8 show plan views of three types of stampings of the magnetic casing
  • FIG. 9 shows a front schematic view of the inductor, the upper flange of which protects the ends of the inductor,
  • FIG. 10 is a schematic end view of the inductor shown in FIG. 9 and,
  • FIG. 11' is 'a schematic view .of a cross-section through the inductor with the upper part removed.
  • the inductor shown in cross-section in FIG. 1, comprises a core 1 formed by a stack of stampings, the profile of which is preferably hexagonal and at least symmetrical relatively to the axis 2 in order to reduce wastage of material during the forming of the stampings from the strip of sheet metal.
  • a winding 3 longitudinally encloses the core 1 and leaves free the end surfaces to which an elastic layer 4 is applied which may be, for example, a film of polyterephthalate or any other compressible material.
  • the object of this layer is to create an air gap between the core and the magnetic casing composed of stampings 5 and 6 stacked one upon the other to form two halfshells enclosing the core 1 and its winding 3.
  • each stamping 5 or 6- has an outer profile 5a or 6a juxtaposable with its inner profile 5b or 6!).
  • the outer profiles terminate in small straight portions forming with the straight sides 5c and 5d, or 60 and 6d, small projections in the form of acute angles.
  • connection of the assembly of wound core and half-shells is effected by means of flanges 7 and 8, the
  • the empty portions 9 and 10 between the core 1, the stampings 5 and 6 and the flanges 7 and 8 correspond to asphere in which the magnetic field is negligible, owing to the shape of the stampings 5 and 6 resting on the surfacesof the core 1 which are inclined relatively to the axis 2.
  • the ends 11 and 12. may contain all-the components required for producing a predetermined electric unit.
  • the end 12 is electrically connected to a connecting member 13 by the connections 14.
  • FIGS. 4 and 5 show two identical inductors the stampings 5 and 6 of which form the magnetic casings and the flanges 7 and 8 have the same configuration, only the cores havingia different structure.
  • the core is formed by transverse members l
  • the core shown in FIG. 5 is formed of Iongitudunal stampings 15, shown, for the sake of clarity, as an end view and not in cross section.
  • the hexagons 1 may, in fact, be stamped out in rows perpendicular to the axis 2, for example, the hexagons of two consecutive rows being relatively displaced by one half-width. Since the stampings are rectangular, there is no need of displacement.
  • the ends which have to come into contact with the members 5 and 6 can be burred or provided with a film of polyterephthalate or any other compressible material, if it is desired to provide an air gap.
  • FIGS. 6, 7 and 8 show three forms of the members 16, 17 and 18 having different profiles and identical projections. These members are stamped out without waste from strips 19, 20 and 21 of'suitable width.
  • the last type 18 has the advantage of comprising a constant straight section.
  • the inductor shown in FIG. 9 again comprises a casing 31 a lower flange 32 preferably also serving for securing of the assembly and an upper flange 33,
  • the casing 31 is formed of two half-shells 34 and 35, (FIG. 10) assembled by the flanges 32 and 33.
  • FIG. 11 shows how the flange 32 keeps the stamping such as 36 and 37 together.
  • the flange 33 connecting the members in the same manner is not shown in FIG. 11.
  • This Figure shows the stampings 36 and 37, the stacks of which located parallel to the longitudinal axis 38, represent the respective half-shells 34 and 35.
  • the axis of the winding 39 is the axis 40 and the core 41 is preferably formed by stampings parallel with the axes 38 and 40.
  • the length L of the part of the member 36 resting on the core 41 is made substantially equal to the width L, of the member at the level of the median plane parallel to the flanges 32 and 33, i.e., extending through the axis 38.
  • the effect of this is to provide the first improvement to the magnetic circuit.
  • the width L of the members of the casing is generally relatively slight in the region of the winding adjacent to the end of the core 41, as stated above.
  • an inner insulating stamping is shown at 46 and at 47 (FIG. 10) a small insulating stamping is shown having two connecting plugs 48 and 49.
  • stampings of at least one half-shell simultaneously have an outer profile juxtaposable with the inner profile and a straight portion connecting the said profiles together and serving as a support for a mounting base of the said inductor.
  • an inductor as claimed in claim 1 wherein the core is formed by the stacking of stampings in the form of a hexagon having an, axis of symmetry passing through two opposed apices, each of the apices being located between a flange and the ends of the inner profiles of the stampings located on either side of the core.
  • an inductor as claimed in claim 1, wherein the core is formed of stampings in the form of rectangles 'of decreasing height and stacked so as to present a cross-section in the form of a hexagon, each of the ends of the centre member, of greater height, being located between a flange and the ends of the inner profiles of the stampings located on either side of the core.
  • An inductor as claimed in claim 1, comprising, between the core and the portion of the inner profiles of the members forming the magnetic casing resting over a length of the core, a compressible material creating an air gap as a function of the pressure provided by each of the flanges laterally supported on the projections formed by the end of the outer profiles of the said members of the magnetic casing.
  • An inductor as claimed in claim 10, wherein a portion of the edge of the lower flange opposite the outer faces of the end stampings are bent parallel to the faces of the stamping for keeping the end stampings from moving along the axis of the core, limiting the the winding.
  • An inductor as claimed in claim 14, wherein at least one of the said protecting faces is provided with at least one passage for establishing connections with 16.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Coils Or Transformers For Communication (AREA)
US00335849A 1972-02-28 1973-02-26 Inductor having a magnetic casing formed by stacked stampings Expired - Lifetime US3824517A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7206669A FR2173689B1 (xx) 1972-02-28 1972-02-28
FR7301545A FR2214164B2 (xx) 1972-02-28 1973-01-17

Publications (1)

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US3824517A true US3824517A (en) 1974-07-16

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US00335849A Expired - Lifetime US3824517A (en) 1972-02-28 1973-02-26 Inductor having a magnetic casing formed by stacked stampings

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US (1) US3824517A (xx)
BE (1) BE795935A (xx)
CA (1) CA966565A (xx)
CH (1) CH576183A5 (xx)
DD (1) DD105346A1 (xx)
DE (1) DE2306370A1 (xx)
ES (1) ES412094A1 (xx)
FR (1) FR2214164B2 (xx)
GB (1) GB1427035A (xx)
IL (1) IL41574A (xx)
LU (1) LU67096A1 (xx)
NL (1) NL7302783A (xx)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002021546A1 (en) * 2000-09-07 2002-03-14 Nucore, Inc. High efficiency inductor
WO2015171560A1 (en) * 2014-05-05 2015-11-12 Hubbell Incorporated Adjustable inductor
JP2020053514A (ja) * 2018-09-26 2020-04-02 Ntn株式会社 インダクタ

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
HU186411B (en) * 1981-05-22 1985-07-29 Hiradastechnikai Anyagok Gyara Plate of laminated core for magnetic circuits
DE3405063A1 (de) * 1984-02-13 1985-09-05 May & Christe Gmbh, Transformatorenwerke, 6370 Oberursel Vorschaltgeraet fuer gasentladungslampen

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US461135A (en) * 1891-10-13 Electric inductional transformer
US1974588A (en) * 1932-03-07 1934-09-25 Harry W Nordendale Transformer or choke
US2294322A (en) * 1940-04-06 1942-08-25 Gen Ind Co Magnetic circuits
GB602290A (en) * 1940-06-26 1948-05-24 Philips Nv Improvements in or relating to magnetic circuits
US2827615A (en) * 1955-11-07 1958-03-18 Gen Electric Inductive device
US2907966A (en) * 1955-05-24 1959-10-06 Gen Electric Core member for inductive device
FR1560537A (xx) * 1968-01-15 1969-03-21
FR1571834A (xx) * 1967-07-01 1969-06-20
DE1563242A1 (de) * 1966-08-23 1969-11-27 Licentia Gmbh Vorschaltdrossel fuer Leuchtstofflampen
US3636488A (en) * 1970-02-05 1972-01-18 Zumtobel Walter Transformer or inductor assembly

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US461135A (en) * 1891-10-13 Electric inductional transformer
US1974588A (en) * 1932-03-07 1934-09-25 Harry W Nordendale Transformer or choke
US2294322A (en) * 1940-04-06 1942-08-25 Gen Ind Co Magnetic circuits
GB602290A (en) * 1940-06-26 1948-05-24 Philips Nv Improvements in or relating to magnetic circuits
US2907966A (en) * 1955-05-24 1959-10-06 Gen Electric Core member for inductive device
US2827615A (en) * 1955-11-07 1958-03-18 Gen Electric Inductive device
DE1563242A1 (de) * 1966-08-23 1969-11-27 Licentia Gmbh Vorschaltdrossel fuer Leuchtstofflampen
FR1571834A (xx) * 1967-07-01 1969-06-20
FR1560537A (xx) * 1968-01-15 1969-03-21
US3636488A (en) * 1970-02-05 1972-01-18 Zumtobel Walter Transformer or inductor assembly

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002021546A1 (en) * 2000-09-07 2002-03-14 Nucore, Inc. High efficiency inductor
WO2015171560A1 (en) * 2014-05-05 2015-11-12 Hubbell Incorporated Adjustable inductor
US10102952B2 (en) 2014-05-05 2018-10-16 Hubbell Incorporated Adjustable inductor
JP2020053514A (ja) * 2018-09-26 2020-04-02 Ntn株式会社 インダクタ

Also Published As

Publication number Publication date
DD105346A1 (xx) 1974-04-12
ES412094A1 (es) 1976-01-01
IL41574A (en) 1976-08-31
FR2214164B2 (xx) 1979-04-27
FR2214164A2 (xx) 1974-08-09
IL41574A0 (en) 1973-04-30
BE795935A (fr) 1973-06-18
CH576183A5 (xx) 1976-05-31
LU67096A1 (xx) 1973-05-03
CA966565A (en) 1975-04-22
DE2306370A1 (de) 1973-09-06
GB1427035A (en) 1976-03-03
NL7302783A (xx) 1973-08-30

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