US2456219A - Coated inductive device - Google Patents

Coated inductive device Download PDF

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Publication number
US2456219A
US2456219A US61085145A US2456219A US 2456219 A US2456219 A US 2456219A US 61085145 A US61085145 A US 61085145A US 2456219 A US2456219 A US 2456219A
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US
United States
Prior art keywords
inductive device
coated
impregnating
transformer
coating
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
Inventor
Shaheen John
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.)
GTE Sylvania Inc
Original Assignee
Sylvania Electric Products Inc
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 Sylvania Electric Products Inc filed Critical Sylvania Electric Products Inc
Priority to US61085145 priority Critical patent/US2456219A/en
Application granted granted Critical
Publication of US2456219A publication Critical patent/US2456219A/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
    • 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
    • H01F41/04—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 for manufacturing coils
    • H01F41/12—Insulating of windings
    • H01F41/127—Encapsulating or impregnating
    • 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
    • H01F27/02—Casings
    • H01F27/022—Encapsulation
    • 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
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2933—Coated or with bond, impregnation or core
    • Y10T428/2936—Wound or wrapped core or coating [i.e., spiral or helical]
    • 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
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2933—Coated or with bond, impregnation or core
    • Y10T428/294—Coated or with bond, impregnation or core including metal or compound thereof [excluding glass, ceramic and asbestos]
    • 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
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31678—Of metal
    • Y10T428/31692—Next to addition polymer from unsaturated monomers

Definitions

  • This invention relates to a method of impregnating an inductive device with a substance which will seal it hermetically. More particularly, it relates to a method of impregnating and insulating an inductive device with a resinous substance which will form a protective coating thereover.
  • An object of this invention is to provide a waterproof coating which will hermetically seal an inductive device. Another object of this invention is to eliminate the use of a metal casing which has heretofore sealed such an inductive device. Another object of this invention is to reduce the weight of the unit by substituting a resinous waterproof impregnation for the metal casing formerly used. A further object of this invention is to make a more compact unit which will occupy a minimum of space.
  • a feature of this invention is the use of tetraethylene glycol dimethacrylate, hereafter referred to as a monomer, either clear or mixed with mica, waterground to a very fine mesh.
  • Figure 1 is a perspective view of a transformer showing the embodiment of the invention.
  • Figure 2 is a cross sectional view through a transformer showing the insulation and impregnation with the resinous substance.
  • l is the resinous coating which hermetically seals the transformer as a unit
  • FIG. 1 represents the cross sections of the wires of the coil in the transformer; 3 represents the layers of paper which insulate the layers of wire in the coil; 4 represents the resinous substance which permeates theunit and insulates the individual wires inthe coil; 5 represents the plates or laminations in the transformer; and 6 represents the bolts which hold the plates in place.
  • the device In order that this impregnation shall remain intact, the device must be removed carefully, its terminal lugs cleaned and the coated device placed in an oven and baked at a suitable temperature until the coating is hard. Polymerization will usually take place at a temperature in the neighborhood of 250 F. in approximately two hours. Usually a higher quality of impregnation can be obtained with the use of vacuum impregnating equipment although sample transformers impregnated without vacuum have been subjected to the salt water immersion test with satisfactoryresults.
  • additional coatings may be added by dipping the transformer in a mixture of suitable thickness and rebaking.
  • An inductive device comprising a magnetizable core, a coil wound thereon, and a coating of tetraethylene glycol dimethacrylate containing insulating particles impregnating the core an coilto seal it from moisture.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulating Of Coils (AREA)

Description

Dec. 14, 1948. I J. SHAHEEN 2,456,219
Q COATED INDUCTIV E DEVICE Filed Aug. 14, 1945 John shake mywak $4M Attov may Patented Dec. 14, 1948 COATED INDUCTIVE DEVICE- John Shaheen, West Roxbury, Mass., assignor to Sylvania Electric Products Inc.,-Salem, Mass. a corporation of Massachusetts Application August 14, 1945, Serial No. 610,851
This invention relates to a method of impregnating an inductive device with a substance which will seal it hermetically. More particularly, it relates to a method of impregnating and insulating an inductive device with a resinous substance which will form a protective coating thereover.
An object of this invention is to provide a waterproof coating which will hermetically seal an inductive device. Another object of this invention is to eliminate the use of a metal casing which has heretofore sealed such an inductive device. Another object of this invention is to reduce the weight of the unit by substituting a resinous waterproof impregnation for the metal casing formerly used. A further object of this invention is to make a more compact unit which will occupy a minimum of space.
A feature of this invention is the use of tetraethylene glycol dimethacrylate, hereafter referred to as a monomer, either clear or mixed with mica, waterground to a very fine mesh.
Figure 1 is a perspective view of a transformer showing the embodiment of the invention; and
Figure 2 is a cross sectional view through a transformer showing the insulation and impregnation with the resinous substance.
In the figures, l is the resinous coating which hermetically seals the transformer as a unit; 2
represents the cross sections of the wires of the coil in the transformer; 3 represents the layers of paper which insulate the layers of wire in the coil; 4 represents the resinous substance which permeates theunit and insulates the individual wires inthe coil; 5 represents the plates or laminations in the transformer; and 6 represents the bolts which hold the plates in place.
In the process of making up the impregnating mixture, I have found that the relative proportions of monomer and mica depend upon the design and construction of the device to be im- 1Clalm. (01. 175-21) pregnated. The inductive device must be dried thoroughly by heating for about two hours at a obtained. The valve is then opened and the impregnating mixture, described above, allowed to enter in sufficient quantity to cover the inductive device completely. After the valve is shut, in some cases it is found necessary to introduce dry air under pressure into the tank to force the plain monomer and/or the mixture into the coils. The unused impregnating material is removed from the tank by a suitablemethod and the. inductive device retains a coating of the mixture. In order that this impregnation shall remain intact, the device must be removed carefully, its terminal lugs cleaned and the coated device placed in an oven and baked at a suitable temperature until the coating is hard. Polymerization will usually take place at a temperature in the neighborhood of 250 F. in approximately two hours. Usually a higher quality of impregnation can be obtained with the use of vacuum impregnating equipment although sample transformers impregnated without vacuum have been subjected to the salt water immersion test with satisfactoryresults.
If needed, additional coatings may be added by dipping the transformer in a mixture of suitable thickness and rebaking.
What I claim is:
An inductive device comprising a magnetizable core, a coil wound thereon, and a coating of tetraethylene glycol dimethacrylate containing insulating particles impregnating the core an coilto seal it from moisture.
JOHN SHAHEEN.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS
US61085145 1945-08-14 1945-08-14 Coated inductive device Expired - Lifetime US2456219A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US61085145 US2456219A (en) 1945-08-14 1945-08-14 Coated inductive device

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Application Number Priority Date Filing Date Title
US61085145 US2456219A (en) 1945-08-14 1945-08-14 Coated inductive device

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US2456219A true US2456219A (en) 1948-12-14

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2618689A (en) * 1948-01-13 1952-11-18 Gen Electric Electromagnetic induction apparatus
US2662930A (en) * 1948-12-13 1953-12-15 Weston Electrical Instr Corp Hermetically sealed electrical unit
US2744204A (en) * 1950-10-25 1956-05-01 Gen Electric Electric coil
US2762988A (en) * 1951-05-25 1956-09-11 Harnischfeger Corp Magnetic core assembly
US2800608A (en) * 1952-03-08 1957-07-23 Hazeltine Research Inc Autotransformer for scanning system of television receiver
US3973321A (en) * 1974-09-10 1976-08-10 The Anaconda Company Method of preparing circuit boards comprising inductors
EP2428968A4 (en) * 2009-05-07 2017-11-01 Sumitomo Electric Industries, Ltd. Reactor

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US844578A (en) * 1905-09-28 1907-02-19 John F Cavanagh Spark-coil.
US1833810A (en) * 1928-11-22 1931-11-24 Schenectady Varnish Company Composition and article impregnated and coated therewith
US1881077A (en) * 1930-10-17 1932-10-04 Hall Norman Electromagnet
GB395687A (en) * 1931-11-17 1933-07-17 Ici Ltd Manufacture of a new polymerisation product and of moulded bodies therefrom
US2101107A (en) * 1935-04-26 1937-12-07 Du Pont Molding compositions and process of molding
US2129722A (en) * 1934-07-14 1938-09-13 Du Pont Esters of methacrylic acid
US2310820A (en) * 1941-03-08 1943-02-09 Western Electric Co Magnetic core

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US844578A (en) * 1905-09-28 1907-02-19 John F Cavanagh Spark-coil.
US1833810A (en) * 1928-11-22 1931-11-24 Schenectady Varnish Company Composition and article impregnated and coated therewith
US1881077A (en) * 1930-10-17 1932-10-04 Hall Norman Electromagnet
GB395687A (en) * 1931-11-17 1933-07-17 Ici Ltd Manufacture of a new polymerisation product and of moulded bodies therefrom
US2129722A (en) * 1934-07-14 1938-09-13 Du Pont Esters of methacrylic acid
US2101107A (en) * 1935-04-26 1937-12-07 Du Pont Molding compositions and process of molding
US2310820A (en) * 1941-03-08 1943-02-09 Western Electric Co Magnetic core

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2618689A (en) * 1948-01-13 1952-11-18 Gen Electric Electromagnetic induction apparatus
US2662930A (en) * 1948-12-13 1953-12-15 Weston Electrical Instr Corp Hermetically sealed electrical unit
US2744204A (en) * 1950-10-25 1956-05-01 Gen Electric Electric coil
US2762988A (en) * 1951-05-25 1956-09-11 Harnischfeger Corp Magnetic core assembly
US2800608A (en) * 1952-03-08 1957-07-23 Hazeltine Research Inc Autotransformer for scanning system of television receiver
US3973321A (en) * 1974-09-10 1976-08-10 The Anaconda Company Method of preparing circuit boards comprising inductors
EP2428968A4 (en) * 2009-05-07 2017-11-01 Sumitomo Electric Industries, Ltd. Reactor

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