US2850707A - Electromagnetic coils - Google Patents

Electromagnetic coils Download PDF

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Publication number
US2850707A
US2850707A US423370A US42337054A US2850707A US 2850707 A US2850707 A US 2850707A US 423370 A US423370 A US 423370A US 42337054 A US42337054 A US 42337054A US 2850707 A US2850707 A US 2850707A
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Prior art keywords
spiral
coating
coil
insulating
coils
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Expired - Lifetime
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US423370A
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Wroblewski Theodore
Zack Albert
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GTE Sylvania Inc
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Sylvania Electric Products Inc
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Application filed by Sylvania Electric Products Inc filed Critical Sylvania Electric Products Inc
Priority to US423370A priority Critical patent/US2850707A/en
Priority to FR1122726D priority patent/FR1122726A/en
Priority to US739040A priority patent/US3068433A/en
Application granted granted Critical
Publication of US2850707A publication Critical patent/US2850707A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/06—Insulation of windings
    • 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
    • H01F27/255—Magnetic cores made from particles
    • 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
    • H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder

Definitions

  • This invention relates to electromagnetic coils, and particularly to spiral coils.
  • An object of the invention is to improve the permeability and increase the inductance of such coils.
  • a further object is to insulate such coils, and yet another is to seal the coils against moisture penetration.
  • Figure l is a side view of a coil according to the invention, but before the application of the coating;
  • Figure 2 is a sectional view through the center, of a coated coil; and Fig. 3 is a side view of the coated coil.
  • Figure 4 is a view of one embodiment of a transformer according to the invention.
  • Fig. 5 is a view showing an embodiment of the invention in which an insulating coating covers the outside of the coil between the latter and a ferromagnetic coating.
  • the porous plastic can have a diameter or side of about 12 inches for convenience, and the coils can be set near the outer side of the material, the coils being supported about an inch or so from the porous plastic by their lead-in wires.
  • the dipping mixture in one example was the Minnesota Mining and Manufacturing Companys Scotchcast Resin #2, a room temperature thermosetting epoxy resin, with a Type C catalyst, various fillers being added to color the resin, to increase its viscosity and to modify the electrical characteristics of the wafer.
  • Scotchcast Resin #2 a room temperature thermosetting epoxy resin
  • Type C catalyst a Type C catalyst
  • various fillers being added to color the resin, to increase its viscosity and to modify the electrical characteristics of the wafer.
  • One such mixture is:
  • the catalyst which can be ethylene diamine, or diethylene triamine, is preferably, about 10% by weight of the resin, the amount being preferably between 1 and 20%.
  • the catalyst is added to the resin before the wafer coils are dipped into it.
  • the epoxy resin is a condensation polymer having the following typical structural formula:
  • the coil may be formed as in cppending application Serial No. 401,333, filed December 30, 1953, by Albert Zack.
  • the coil can have a core 3 of ferromagnetic material, or it can have an insulating core.
  • the ferromagnetic material is preferably an iron powder embedded in a resin such as epoxy, although other ferromagnetic cores can be used.
  • a coating 4 of ferromagnetic powder for example powdered iron, in a binder such as epoxy resin, nylon, polystyrene, wax, shellac, varnish, polyethylene, lacquer, glass ceramic or
  • a binder such as epoxy resin, nylon, polystyrene, wax, shellac, varnish, polyethylene, lacquer, glass ceramic or
  • the coating can be applied by dipping, spraying, painting or in any other convenient manner.
  • the binder can then be dried, or set. If a material such as epoxy resin is used, the coil can be set in a form of the desired size and shape, and the epoxy resin cast about the coil.
  • the wafers are preferably supported by their leads 5, 6 and immersed in a dipping resin. After immersion, they are dried. The drying is done by pushing the leads into a piece of porous plastic, for example Polarfoam, which can be mounted on a wooden piece fixed to a shaft which is rotated at a speed, for example, of three revolutions per minute. During the rotation, the Wafers The thickness of the coating 4 and the amount of ferromagnetic material in it can be varied to give the desired inductance or other results.
  • a piece of porous plastic for example Polarfoam
  • the amount of ferromagnetic material can vary from a small amount, say a few percent by ,volume of the coating, to nearly It may be desirable in some cases, say for the reduction of leakage flux, to space the conductor at its sides from the magnetic coating, as in Fig. 5. This can be done with an insulating washer or disk, or by first applying to the coil an insulating coating, of a material such as those mentioned above for use with the magnetic coating but without the magnetic material. A coating 4 of insulating material containing magnetic material can then be applied over the insulating coating 14.
  • lead-in wires 5 and 6 are attached to the ends of the spiralled conductor strip 1. This can be done in any convenient manner, for example by soldering. The soldering will be facilitated if, before winding the strip 2, one end is wrapped around a metal wire ll, parallel to the axis of the coil, and the other end of strip 2 is wrapped around a similar wire 12.
  • a transformer instead of an inductance coil
  • two of the coils can be placed side by side as shown in Fig. 1-, preferably on a common core 10 of ferromagnetic powder, and the ferromagnetic coating 4 applied over the resultant double coil, 12, 7-8. Coating should not be applied between the coils unless a considerable amount of leakage reactance is desired.
  • coils can have different numbers of turns to give a different voltage ratio.
  • one coil can be wound over another, with lead-in wires such as 5, 6 attached to each coil.
  • the outer diameter of the inner coil will be less than the inside diameter of the outer coil, the two being concentric.
  • the metal strip 2 is marked Aluminum in some of the figures, it can be of copper or other metal or conducting material. However, due to the space factor of the spiral coils of the invention, the use of aluminum will generally give as compact a coil as copper would, and often as low a resistance, together with a saving in weight.
  • the insulating layer is marked Paper in the figure, it can be of other insu lating material, and can even be a coating of insulating enamel, lacquer, oxide, resin or the like on the metal conductor. If the conductor is aluminum, anodization of the aluminum can provide the insulation, the anodization producing an oxide coating on the aluminum.
  • Two conducting strips separated by insulating strips can be wound in a bifilar manner, if desired, to form a transformer.
  • the core of the spiral may be left open, that is, so that the coil is annular in form, and if desired, a screw-threaded plug of ferromagnetic powder embedded in a binder can be screwed into said coil until the desired inductance or mutual inductance is attained.
  • a coating of insulating material alone for example, of the insulating material specified above, may be applied to the coils.
  • a colored pigment may also be incorporated, to give the finished coil, a white, blue, red or other color. Different colors can be used for different types of coil, for example, a coil of one inductance could be White, of another inductance blue, and the like.
  • Zinc oxide or similar fillers in the coating will change the distributed capacity of the coil.
  • the capacity of the coil can be varied by changing the spacing between the coils or the dielectric constant of the spacing material 13.
  • the inductance will also vary with the spacing.
  • An electromagnetic device comprising a substantially flat, one-turn wide spiral of metal ribbon, a oneturn Wide spiral of solid non-magnetic insulating ribbon filling the space between the turns of said spiral, and a coating of ferromagnetic powder in insulating material over the outside of said spiral.
  • An electromagnetic device comprising a substantially fiat, one-turn wide spiral of metal ribbon, a oneturn wide spiral of solid nn-magnetic insulating ribbon filling the space between the turns of said spiral, a coating of ferromagnetic powder in insulating material over the outside only of said spiral, and a ferromagnetic core within said spiral, the whole forming a wafer-like inductive unit.
  • An electromagnetic device comprising a substantially flat, one-turn wide spiral of metal ribbon, a one turn wide spiral of solid non-magnetic insulating ribbon filling the space between the turns of said spiral, another one-turn wide spiral of metal ribbon coaxial with but spaced from said first spiral of metal ribbon, a second one-turn wide spiral of solid non-magnetic insulating ribbon filling the space between the turns of said secondmentioned spiral of metal ribbon, a filling of solid nonmagnetic insulating material in the space between said two spirals of metal ribbon, and a coating of ferromagnetic material over the outside surface of said combination of spirals of metal ribbon.
  • An electromagnetic device comprising a substantially flat, one-turn wide spiral of electrically-conductive material, solid non-magnetic insulating material between the turns of said spiral to space the same apart, a coating of insulating material over said spiral, and a coating of ferromagnetic material in an insulating binder over said first-mentioned coating of insulating material.
  • An electromagnetic device comprising a substantially fiat, one-turn wide spiral of metal ribbon, a oneturn wide spiral of solid non-magnetic insulating ribbon filling the space between the turns of said spiral, and a coating of ferromagnetic powder and a powdered coloring pigment in a binder over the outside of said spiral.
  • An electromagnetic device comprising a substantially fiat, one-turn Wide spiral of metal ribbon, a one turn Wide spiral of solid non-magnetic insulating ribbon filling the space between the turns of said spiral, and a coating of a powdered coloring material in an insulating binder over the outside of said spiral.

Description

p 1958 WROBLEWSKI ETAL 2,850,707
ELECTROMAGNETIC COILS Filed April 15, 1954 PAPER ALUMINUM ALuM|NuM\i;
PAPER IRON FIG. 2
THEODORE WRQaLEWJ Kl, A 1. BERT Z AC K,
FIG.3
INVENTORS.
BY 7 W 8414 -1.
Avrmusy,
the like.
States Patent ELECTROMAGNETIC COILS Theodore Wroblewski and Albert Zack, Danvers, Mass., assignors to Sylvania Electric Products Inc., Salem, Mass, a corporation of Massachusetts Application April 15, 1954, Serial No. 423,370
11 Claims. (Cl. 336-83) This invention relates to electromagnetic coils, and particularly to spiral coils.
An object of the invention is to improve the permeability and increase the inductance of such coils.
A further object is to insulate such coils, and yet another is to seal the coils against moisture penetration.
These and other objects are accomplished by covering the coil with a mixture of ferromagnetic powders in a binder such as a resin, lacquer, wax, glass or the like.
Other objects, features and advantages of the invention will be apparent from the following specification, taken in connection with the accompanying drawings, in which:
Figure l is a side view of a coil according to the invention, but before the application of the coating;
Figure 2 is a sectional view through the center, of a coated coil; and Fig. 3 is a side view of the coated coil.
Figure 4 is a view of one embodiment of a transformer according to the invention.
Fig. 5 is a view showing an embodiment of the invention in which an insulating coating covers the outside of the coil between the latter and a ferromagnetic coating.
In Fig. l, the strip 1 of a conducting material, for
Fatented Sept. 2, 1%58 turn completely about their axis; this gives a uniform flow during drying. The rotation continues until the resin hardens, which generally takes from 4 to 12 hours.
The porous plastic can have a diameter or side of about 12 inches for convenience, and the coils can be set near the outer side of the material, the coils being supported about an inch or so from the porous plastic by their lead-in wires.
The dipping mixture in one example was the Minnesota Mining and Manufacturing Companys Scotchcast Resin #2, a room temperature thermosetting epoxy resin, with a Type C catalyst, various fillers being added to color the resin, to increase its viscosity and to modify the electrical characteristics of the wafer. One such mixture is:
75 grams resin 30 grams powdered zinc oxide The zinc oxide serves to thicken the resin and to color 0 it WhltB.' Other pigments can be used, especially where 100 grams resin 20 grams of finely powdered iron 20 grams of finely powdered mica The iron serves to increase the inductance of the wafer and to reduce the resonant frequency. The mica gives the resin the necessary bulk.
The catalyst which can be ethylene diamine, or diethylene triamine, is preferably, about 10% by weight of the resin, the amount being preferably between 1 and 20%. The catalyst is added to the resin before the wafer coils are dipped into it.
The epoxy resin is a condensation polymer having the following typical structural formula:
example copper, aluminum or the like, is wound into a spiral, with successive turns being spaced apart and insulated from each other by the concentric spiral strip 2 of insulating material, for example, insulating paper, resin orthe like. The coil may be formed as in cppending application Serial No. 401,333, filed December 30, 1953, by Albert Zack.
The coil can have a core 3 of ferromagnetic material, or it can have an insulating core. The ferromagnetic material is preferably an iron powder embedded in a resin such as epoxy, although other ferromagnetic cores can be used.
Around the coil, and preferably extending all around it to form a closed magnetic circuit, is a coating 4 of ferromagnetic powder, for example powdered iron, in a binder such as epoxy resin, nylon, polystyrene, wax, shellac, varnish, polyethylene, lacquer, glass ceramic or The coating can be applied by dipping, spraying, painting or in any other convenient manner. The binder can then be dried, or set. If a material such as epoxy resin is used, the coil can be set in a form of the desired size and shape, and the epoxy resin cast about the coil.
The wafers are preferably supported by their leads 5, 6 and immersed in a dipping resin. After immersion, they are dried. The drying is done by pushing the leads into a piece of porous plastic, for example Polarfoam, which can be mounted on a wooden piece fixed to a shaft which is rotated at a speed, for example, of three revolutions per minute. During the rotation, the Wafers The thickness of the coating 4 and the amount of ferromagnetic material in it can be varied to give the desired inductance or other results. The amount of ferromagnetic material can vary from a small amount, say a few percent by ,volume of the coating, to nearly It may be desirable in some cases, say for the reduction of leakage flux, to space the conductor at its sides from the magnetic coating, as in Fig. 5. This can be done with an insulating washer or disk, or by first applying to the coil an insulating coating, of a material such as those mentioned above for use with the magnetic coating but without the magnetic material. A coating 4 of insulating material containing magnetic material can then be applied over the insulating coating 14.
Prior to the application of the coating, lead-in wires 5 and 6 are attached to the ends of the spiralled conductor strip 1. This can be done in any convenient manner, for example by soldering. The soldering will be facilitated if, before winding the strip 2, one end is wrapped around a metal wire ll, parallel to the axis of the coil, and the other end of strip 2 is wrapped around a similar wire 12.
If a transformer is desired instead of an inductance coil, two of the coils can be placed side by side as shown in Fig. 1-, preferably on a common core 10 of ferromagnetic powder, and the ferromagnetic coating 4 applied over the resultant double coil, 12, 7-8. Coating should not be applied between the coils unless a considerable amount of leakage reactance is desired. The
coils can have different numbers of turns to give a different voltage ratio.
Instead of placing two coils side by side, one coil can be wound over another, with lead-in wires such as 5, 6 attached to each coil. The outer diameter of the inner coil will be less than the inside diameter of the outer coil, the two being concentric.
Although the metal strip 2 is marked Aluminum in some of the figures, it can be of copper or other metal or conducting material. However, due to the space factor of the spiral coils of the invention, the use of aluminum will generally give as compact a coil as copper would, and often as low a resistance, together with a saving in weight. Similarly, although the insulating layer is marked Paper in the figure, it can be of other insu lating material, and can even be a coating of insulating enamel, lacquer, oxide, resin or the like on the metal conductor. If the conductor is aluminum, anodization of the aluminum can provide the insulation, the anodization producing an oxide coating on the aluminum.
Two conducting strips separated by insulating strips can be wound in a bifilar manner, if desired, to form a transformer.
If desired, the core of the spiral may be left open, that is, so that the coil is annular in form, and if desired, a screw-threaded plug of ferromagnetic powder embedded in a binder can be screwed into said coil until the desired inductance or mutual inductance is attained.
in cases where it is desired merely to insulate the coils, a coating of insulating material alone, for example, of the insulating material specified above, may be applied to the coils. Whether or not a ferromagnetic powder is incorporated in the insulated material, a colored pigment may also be incorporated, to give the finished coil, a white, blue, red or other color. Different colors can be used for different types of coil, for example, a coil of one inductance could be White, of another inductance blue, and the like.
Zinc oxide or similar fillers in the coating will change the distributed capacity of the coil.
Where two coils are used, the capacity of the coil can be varied by changing the spacing between the coils or the dielectric constant of the spacing material 13.
The inductance will also vary with the spacing.
What we claim is:
1. An electromagnetic device comprising a substantially flat, one-turn wide spiral of metal ribbon, a oneturn Wide spiral of solid non-magnetic insulating ribbon filling the space between the turns of said spiral, and a coating of ferromagnetic powder in insulating material over the outside of said spiral.
2. The combination of claim 1, in which the insulating material is epoxy resin.
3. An electromagnetic device comprising a substantially fiat, one-turn wide spiral of metal ribbon, a oneturn wide spiral of solid nn-magnetic insulating ribbon filling the space between the turns of said spiral, a coating of ferromagnetic powder in insulating material over the outside only of said spiral, and a ferromagnetic core within said spiral, the whole forming a wafer-like inductive unit.
4. An electromagnetic device comprising a substantially flat, one-turn wide spiral of metal ribbon, a one turn wide spiral of solid non-magnetic insulating ribbon filling the space between the turns of said spiral, another one-turn wide spiral of metal ribbon coaxial with but spaced from said first spiral of metal ribbon, a second one-turn wide spiral of solid non-magnetic insulating ribbon filling the space between the turns of said secondmentioned spiral of metal ribbon, a filling of solid nonmagnetic insulating material in the space between said two spirals of metal ribbon, and a coating of ferromagnetic material over the outside surface of said combination of spirals of metal ribbon.
5. The combination of claim 4 and a ferromagnetic core within said coils.
6. The combination of claim 4, in which the insulating material is epoxy resin.
7. An electromagnetic device comprising a substantially flat, one-turn wide spiral of electrically-conductive material, solid non-magnetic insulating material between the turns of said spiral to space the same apart, a coating of insulating material over said spiral, and a coating of ferromagnetic material in an insulating binder over said first-mentioned coating of insulating material.
8. An electromagnetic device comprising a substantially fiat, one-turn wide spiral of metal ribbon, a oneturn wide spiral of solid non-magnetic insulating ribbon filling the space between the turns of said spiral, and a coating of ferromagnetic powder and a powdered coloring pigment in a binder over the outside of said spiral.
9. The combination of claim 8, in which the insulating material is epoxy resin.
10. An electromagnetic device comprising a substantially fiat, one-turn Wide spiral of metal ribbon, a one turn Wide spiral of solid non-magnetic insulating ribbon filling the space between the turns of said spiral, and a coating of a powdered coloring material in an insulating binder over the outside of said spiral.
11. The combination of claim 10, in which the insulating material is epoxy resin.
References Cited in the file of this patent UNITED STATES PATENTS 512,340 Tesla Jan. 9, 1894 1,837,678 Ryder Dec. 22, 1931 2,282,759 Gavitt Aug. 3, 1940 2,457,806 Crippa Jan. 4, 1949 2,785,349 Wolfson et al Mar. 12, 1957 FOREIGN PATENTS 97,887 Germany Aug. 4, 1897
US423370A 1954-04-15 1954-04-15 Electromagnetic coils Expired - Lifetime US2850707A (en)

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US423370A US2850707A (en) 1954-04-15 1954-04-15 Electromagnetic coils
FR1122726D FR1122726A (en) 1954-04-15 1955-04-15 Improvements to electromagnetic coils
US739040A US3068433A (en) 1954-04-15 1958-06-02 Electromagnetic coils

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Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3021234A (en) * 1957-10-24 1962-02-13 Minnesota Mining & Mfg Epoxy coating composition and method of coating electrical article therewith
US3058078A (en) * 1956-02-21 1962-10-09 Siegfried R Hoh Low capacitance transformer
US3068433A (en) * 1954-04-15 1962-12-11 Sylvania Electric Prod Electromagnetic coils
US3170225A (en) * 1957-03-15 1965-02-23 Gen Electric Method of making foil wound electrical coils
US3225269A (en) * 1955-01-03 1965-12-21 Willis G Worcester Electrical apparatus
US3247476A (en) * 1961-06-14 1966-04-19 Intron Int Inc Electromagnetic device
US3283188A (en) * 1963-02-08 1966-11-01 Reliance Electric & Eng Co Coil construction
US3325760A (en) * 1965-10-01 1967-06-13 Gen Motors Corp Electromagnet with resinous ferromagnetic cladding
US3419834A (en) * 1966-03-24 1968-12-31 Ian C. Mckechnie Electrical coils
US3505569A (en) * 1966-09-30 1970-04-07 Telefunken Patent Inductive circuit component
US3611226A (en) * 1969-12-08 1971-10-05 Westinghouse Electric Corp Encapsulated electrical windings
US4012706A (en) * 1975-12-08 1977-03-15 General Electric Company Sheet-wound transformer coils
US4021764A (en) * 1975-12-08 1977-05-03 General Electric Company Sheet-wound transformer coils with reduced edge heating
WO1992005568A1 (en) * 1990-09-21 1992-04-02 Coilcraft, Inc. Inductive device and method of manufacture
US5262746A (en) * 1991-05-16 1993-11-16 Victor Company Of Japan, Ltd. Ribbon coil for motor winding
FR2737038A1 (en) * 1995-07-18 1997-01-24 Dale Electronics HIGH CURRENT EXTRA-FLAT INDUCTOR AND MANUFACTURING METHOD THEREOF
US6483409B1 (en) * 1998-03-05 2002-11-19 Murata Manufacturing Co., Ltd. Bead inductor
US20050122200A1 (en) * 1999-03-16 2005-06-09 Vishay Dale Electronics, Inc. Inductor coil and method for making same
US20060284715A1 (en) * 2005-06-21 2006-12-21 Camarena Villasenor Jose D J Energy saving system for a unit requiring electricity
USRE39453E1 (en) 1999-10-28 2007-01-02 Coilcraft, Incorporated Low profile inductive component
US20070186407A1 (en) * 1995-07-18 2007-08-16 Vishay Dale Electronics, Inc. Method for making a high current low profile inductor
US20080110014A1 (en) * 1995-07-18 2008-05-15 Vishay Dale Electronics, Inc. Method for making a high current low profile inductor
US20090134719A1 (en) * 2006-04-14 2009-05-28 Ciiis, Llc Electric motor containing ferromagnetic particles
US20110005064A1 (en) * 2006-08-09 2011-01-13 Coilcraft, Incorporated Method of manufacturing an electronic component
CN102640236A (en) * 2010-01-06 2012-08-15 株式会社神户制钢所 Composite wound element and transformer using same, transformation system, and composite wound element for noise-cut filter
CN103003894A (en) * 2010-07-27 2013-03-27 株式会社神户制钢所 Multi-phase transformer and transformation system
US20140300439A1 (en) * 2011-10-04 2014-10-09 Furukawa Magnet Wire Co., Ltd. Wire rod for inductor, and inductor
US20160379752A1 (en) * 2015-06-26 2016-12-29 Donald S. Gardner Variable inductor and wireless communication device including variable device for conversion of a baseband signal to a radio frequency (rf) range

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DE1102910B (en) * 1957-07-24 1961-03-23 Foster Transformers Ltd Coil structure for transformers or the like. Electrical winding arrangements
JPS5851406B2 (en) * 1977-09-07 1983-11-16 株式会社東芝 semiconductor circuit

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US512340A (en) * 1893-07-07 1894-01-09 Nikola Tesla Coil for electro-magnets
US1837678A (en) * 1928-09-12 1931-12-22 Ryder Samuel Charles Inductance coil particularly adapted for use with radio tuning devices
US2282759A (en) * 1940-08-03 1942-05-12 Gavitt Mfg Company Antenna loop
US2457806A (en) * 1946-06-11 1949-01-04 Eugene R Crippa Inductance coil
US2785349A (en) * 1951-06-08 1957-03-12 Int Standard Electric Corp Electric semi-conducting devices

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DE97887C (en) *
US512340A (en) * 1893-07-07 1894-01-09 Nikola Tesla Coil for electro-magnets
US1837678A (en) * 1928-09-12 1931-12-22 Ryder Samuel Charles Inductance coil particularly adapted for use with radio tuning devices
US2282759A (en) * 1940-08-03 1942-05-12 Gavitt Mfg Company Antenna loop
US2457806A (en) * 1946-06-11 1949-01-04 Eugene R Crippa Inductance coil
US2785349A (en) * 1951-06-08 1957-03-12 Int Standard Electric Corp Electric semi-conducting devices

Cited By (49)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3068433A (en) * 1954-04-15 1962-12-11 Sylvania Electric Prod Electromagnetic coils
US3225269A (en) * 1955-01-03 1965-12-21 Willis G Worcester Electrical apparatus
US3058078A (en) * 1956-02-21 1962-10-09 Siegfried R Hoh Low capacitance transformer
US3170225A (en) * 1957-03-15 1965-02-23 Gen Electric Method of making foil wound electrical coils
US3021234A (en) * 1957-10-24 1962-02-13 Minnesota Mining & Mfg Epoxy coating composition and method of coating electrical article therewith
US3247476A (en) * 1961-06-14 1966-04-19 Intron Int Inc Electromagnetic device
US3283188A (en) * 1963-02-08 1966-11-01 Reliance Electric & Eng Co Coil construction
US3325760A (en) * 1965-10-01 1967-06-13 Gen Motors Corp Electromagnet with resinous ferromagnetic cladding
US3419834A (en) * 1966-03-24 1968-12-31 Ian C. Mckechnie Electrical coils
US3505569A (en) * 1966-09-30 1970-04-07 Telefunken Patent Inductive circuit component
US3611226A (en) * 1969-12-08 1971-10-05 Westinghouse Electric Corp Encapsulated electrical windings
US4012706A (en) * 1975-12-08 1977-03-15 General Electric Company Sheet-wound transformer coils
US4021764A (en) * 1975-12-08 1977-05-03 General Electric Company Sheet-wound transformer coils with reduced edge heating
WO1992005568A1 (en) * 1990-09-21 1992-04-02 Coilcraft, Inc. Inductive device and method of manufacture
US5262746A (en) * 1991-05-16 1993-11-16 Victor Company Of Japan, Ltd. Ribbon coil for motor winding
US7921546B2 (en) 1995-07-18 2011-04-12 Vishay Dale Electronics, Inc. Method for making a high current low profile inductor
US20100007455A1 (en) * 1995-07-18 2010-01-14 Vishay Dale Electronics, Inc. Method for making a high current low profile inductor
US6460244B1 (en) 1995-07-18 2002-10-08 Vishay Dale Electronics, Inc. Method for making a high current, low profile inductor
US20070262841A1 (en) * 1995-07-18 2007-11-15 Vishay Dale Electronics, Inc. Method for making a high current low profile inductor
US20080110014A1 (en) * 1995-07-18 2008-05-15 Vishay Dale Electronics, Inc. Method for making a high current low profile inductor
US7263761B1 (en) 1995-07-18 2007-09-04 Vishay Dale Electronics, Inc. Method for making a high current low profile inductor
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