US3440587A - Electrical induction apparatus construction - Google Patents

Electrical induction apparatus construction Download PDF

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Publication number
US3440587A
US3440587A US3440587DA US3440587A US 3440587 A US3440587 A US 3440587A US 3440587D A US3440587D A US 3440587DA US 3440587 A US3440587 A US 3440587A
Authority
US
United States
Prior art keywords
insulative
impregnant
spacer
transformer
flexible 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
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English (en)
Inventor
Donald M Bartos
Raymond J Price
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.)
Dow Silicones Corp
Original Assignee
Dow Corning Corp
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 Dow Corning Corp filed Critical Dow Corning Corp
Application granted granted Critical
Publication of US3440587A publication Critical patent/US3440587A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B19/00—Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers
    • B26B19/14—Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers of the rotary-cutter type; Cutting heads therefor; Cutters therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B19/00—Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers
    • B26B19/38—Details of, or accessories for, hair clippers, or dry shavers, e.g. housings, casings, grips, guards
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B19/00—Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers
    • B26B19/38—Details of, or accessories for, hair clippers, or dry shavers, e.g. housings, casings, grips, guards
    • B26B19/3873—Electric features; Charging; Computing devices
    • 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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/323—Insulation between winding turns, between winding layers
    • 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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/327—Encapsulating or impregnating
    • 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
    • Y10T29/4902—Electromagnet, transformer or inductor
    • 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
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49071—Electromagnet, transformer or inductor by winding or coiling
    • 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]
    • Y10T428/31652—Of asbestos
    • Y10T428/31663—As siloxane, silicone or silane

Definitions

  • the present invention relates to electrical induction apparatus such as transformers, and is particularly related to the electrical insulation provided in such units.
  • Oil-filled transformers in general, are constructed with kraft paper barriers between the high and low voltage windings. Since the units are designed to operate at relatively low temperatures and since the entire unit is immersed in oil, the paper insulattion is entirely satisfactory if one is to accept the premise that an oil-filled unit is optimum.
  • dry-type transformers In relatively low power equipment, there are in use today many types of so-called dry-type transformers in which all insulating materials, while the unit is being used, are in a solid rather than liquid state. Such units are used, for example, in electronic equipment. It has heretofore been proposed that dry-type transformers can be used in power distribution systems.
  • electrically insulative spacer sheet of kraft paper for example, is coated with a flexible insulation material such as a silicone rubber or gel; and the unit is interleaved between adjacent layers of windings of the induction coil.
  • the interstices between the turns in each layer of the winding and between the layers of turns in the spacers are filled with an insulative impregnant having substantially greater rigidity than the flexible coating on the spacer.
  • the flexible coating thus acts as a stress absorbing member for changes in dimension in the unit and allows only minor amounts of stress to be absorbed by the impregnant.
  • the flexible coating may contain embedded thereon a quantity of particulate insulating material which acts as a spacer to allow the free flow of uncured impregnant during construction of the device. Since the granular material is also embedded in the flexible material, there is no substantial increase in transmission of stresses to the impregnant.
  • the induction equipment produced in accordance with the present invention can be made extremely compact and light weight. Additionally, all of the problems inherent in oil-filled units are eliminated or substantially reduced. The necessity for maintenance is minimized. Other objects and advantages of the present invention will become apparent to those skilled in the art from a consideration of the following detailed description when read in conjunction with the accompanying drawings.
  • FIGURE 1 is a view in perspective of an electrical transformer made in accordance with the present invention
  • FIGURE 2 is a cross-sectional view of the transformer of FIGURE 1 taken along the line 2-2 of FIGURE 1;
  • FIGURE 3 is a fragmentary cross-sectional view of the transformer of FIGURES 1 and 2 taken along the line 33 of FIGURE 2.
  • FIGURE 1 a transformer having an iron core 11. Placed around the iron core 11 are the transformer windings, shown generally as 12, which have pairs of leads 13 and 14 projecting therefrom. While the present invention will be described with respect to the simple two-winding transformer shown in the drawings, it will be realized that the same principles described herein are applicable to various other types of transformer designs as well as other types of electrical induction equipment.
  • the windings 12 comprise a winding form 16 positioned in close proximity to the core 11, and around which is placed a low voltage winding 17, the insulating spacer 1'8, and a high voltage winding 19.
  • the high voltage winding consists of a first layer of turns 21 in direct contact with the winding form 16.
  • the particles 24 are designed primarily to act as spacers to allow free flow of impregnant into the unit during fabrication and may be eliminated if so desired.
  • Suitable materials include grains of sand, glass beads, or particles of electrically insulating resinous materials suchas epoxy, for example.
  • Surrounding the spacer member is a second layer 26 of low voltage turns which, in turn, is surrounded by a barrier layer comprising multiple turns of a spacer combination identical to that interposed between the winding layers 21 and 26.
  • a barrier layer comprising multiple turns of a spacer combination identical to that interposed between the winding layers 21 and 26.
  • Formed on the exterior surface of the barrier layer 18 are the high voltage winding layers 27, 28 and 29, again interleaved with the insulative spacer combination of sheet, flexible coating, and granular particle.
  • All interstices between turns in each layer and between the layers of turns and the spacer-s are filled with an insulative impregnant having in accordance with the invention substantially greater rigidity than the flexible coating on the insulative spacers.
  • Suitable materials for the impregnants include, for example, epoxy resins and silicone resins, although any electrically insulating ma ter-ial which may be flowed into the unit in a liquid state and then solidified can be used.
  • the flexible coatings on the insulative spacers absorb the major portion of such stresses and prevent cracking or tearing of the relatively rigid impregnant.
  • This type of configuration can therefore use a dielectric gel as the flexible coating and a relatively low tear strength encapsulant, as well as the elas-tomeric coating-resinous impregnant combination described hereinabove.
  • an insulative impregnant filling substantially all interstices between turns in each layer and between said layers of turns and the flexible coating on said spacers, said insulative impregnant being of substantially greater rigidity than said flexible coating.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Mechanical Engineering (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Insulating Of Coils (AREA)
US3440587D 1966-02-21 1967-04-11 Electrical induction apparatus construction Expired - Lifetime US3440587A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US52885666A 1966-02-21 1966-02-21
US62933567A 1967-02-06 1967-02-06
US62995567A 1967-04-11 1967-04-11

Publications (1)

Publication Number Publication Date
US3440587A true US3440587A (en) 1969-04-22

Family

ID=27415013

Family Applications (1)

Application Number Title Priority Date Filing Date
US3440587D Expired - Lifetime US3440587A (en) 1966-02-21 1967-04-11 Electrical induction apparatus construction

Country Status (3)

Country Link
US (1) US3440587A (enrdf_load_stackoverflow)
GB (1) GB1183871A (enrdf_load_stackoverflow)
NL (1) NL297144A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3726005A (en) * 1970-03-20 1973-04-10 Iskra Zavod Za Avtomatiz Method of manufacturing flat-wire field coils
US4095204A (en) * 1975-01-27 1978-06-13 Mitsubishi Denki Kabushiki Kaisha Transformer having forced oil cooling system
DE3623485A1 (de) * 1986-07-11 1988-01-21 Licentia Gmbh Verfahren zur herstellung hochspannungsfester transformatoren und drosseln
EP2530687A4 (en) * 2010-01-29 2014-05-21 Youngsin Metal Ind Co Ltd LOW-FREQUENCY CURRENT TRANSFORMER AND MAGNETIC HYSTERESIS AND METHOD FOR MANUFACTURING THE SAME
CN107649598A (zh) * 2017-11-14 2018-02-02 天津迈斯特机车配件有限公司 一种马达碳刷套超声波铆接系统
US11139109B2 (en) * 2018-09-07 2021-10-05 Abb Power Grids Switzerland Ag Leakage reactance plate for power transformer

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5835716B2 (ja) * 1980-03-03 1983-08-04 松下電工株式会社 電気かみそりの電池カバ−取付構造
JPS57500869A (enrdf_load_stackoverflow) * 1980-04-10 1982-05-20
ES8207451A1 (es) * 1980-04-10 1982-09-16 Mercer Nairne & Co Ltd Torreta perfeccionada para maquinas punzonadoras.
DE4129556A1 (de) 1991-09-05 1993-03-11 Amada Co Revolverkopfstanzpresse
JP6005495B2 (ja) * 2012-12-06 2016-10-12 株式会社泉精器製作所 ロータリー式電気かみそりの外刃の製造方法
CN114682672B (zh) * 2022-03-30 2024-12-24 诸暨市斌果科技有限公司 一种适用于电磁阀阀盖的打孔装置
CN117900326B (zh) * 2024-03-20 2024-05-14 德州国豪空调设备有限公司 一种空调单向阀的冲压装置

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US961805A (en) * 1906-07-30 1910-06-21 Otis Elevator Co Electromagnet.
US1495823A (en) * 1921-01-14 1924-05-27 Acme Wire Company Electrical coil and method of making the same
US2683767A (en) * 1953-08-27 1954-07-13 Melpar Inc Potting of electrical components
US2686904A (en) * 1950-12-13 1954-08-17 Bell Telephone Labor Inc Corona shielding insulation
US2743308A (en) * 1950-12-19 1956-04-24 Bell Telephone Labor Inc Housing for electrical apparatus and method of manufacture
US2914600A (en) * 1952-09-05 1959-11-24 Chicago Telephone Of Californi Embedded coil and method of manufacturing
US2951277A (en) * 1958-12-04 1960-09-06 Dow Corning Fabric having controlled stretch
US2993949A (en) * 1956-10-08 1961-07-25 Minnesota Mining & Mfg Electrical insulating tape and article formed therewith
CA652037A (en) * 1962-11-13 P. Jones Samuel Electric insulation
GB970037A (en) * 1963-02-25 1964-09-16 Pirelli Improvements in or relating to high-tension electric cables
US3210701A (en) * 1962-05-14 1965-10-05 Automatic Elect Lab Wound toroidal core shell
US3339162A (en) * 1965-05-25 1967-08-29 Riegel Paper Corp Electrical coil and method of making the same

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA652037A (en) * 1962-11-13 P. Jones Samuel Electric insulation
US961805A (en) * 1906-07-30 1910-06-21 Otis Elevator Co Electromagnet.
US1495823A (en) * 1921-01-14 1924-05-27 Acme Wire Company Electrical coil and method of making the same
US2686904A (en) * 1950-12-13 1954-08-17 Bell Telephone Labor Inc Corona shielding insulation
US2743308A (en) * 1950-12-19 1956-04-24 Bell Telephone Labor Inc Housing for electrical apparatus and method of manufacture
US2914600A (en) * 1952-09-05 1959-11-24 Chicago Telephone Of Californi Embedded coil and method of manufacturing
US2683767A (en) * 1953-08-27 1954-07-13 Melpar Inc Potting of electrical components
US2993949A (en) * 1956-10-08 1961-07-25 Minnesota Mining & Mfg Electrical insulating tape and article formed therewith
US2951277A (en) * 1958-12-04 1960-09-06 Dow Corning Fabric having controlled stretch
US3210701A (en) * 1962-05-14 1965-10-05 Automatic Elect Lab Wound toroidal core shell
GB970037A (en) * 1963-02-25 1964-09-16 Pirelli Improvements in or relating to high-tension electric cables
US3339162A (en) * 1965-05-25 1967-08-29 Riegel Paper Corp Electrical coil and method of making the same

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3726005A (en) * 1970-03-20 1973-04-10 Iskra Zavod Za Avtomatiz Method of manufacturing flat-wire field coils
US4095204A (en) * 1975-01-27 1978-06-13 Mitsubishi Denki Kabushiki Kaisha Transformer having forced oil cooling system
DE3623485A1 (de) * 1986-07-11 1988-01-21 Licentia Gmbh Verfahren zur herstellung hochspannungsfester transformatoren und drosseln
EP2530687A4 (en) * 2010-01-29 2014-05-21 Youngsin Metal Ind Co Ltd LOW-FREQUENCY CURRENT TRANSFORMER AND MAGNETIC HYSTERESIS AND METHOD FOR MANUFACTURING THE SAME
CN107649598A (zh) * 2017-11-14 2018-02-02 天津迈斯特机车配件有限公司 一种马达碳刷套超声波铆接系统
US11139109B2 (en) * 2018-09-07 2021-10-05 Abb Power Grids Switzerland Ag Leakage reactance plate for power transformer

Also Published As

Publication number Publication date
NL297144A (enrdf_load_stackoverflow) 1900-01-01
GB1183871A (en) 1970-03-11

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