US3886510A - High-voltage inductive coil - Google Patents

High-voltage inductive coil Download PDF

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Publication number
US3886510A
US3886510A US390474A US39047473A US3886510A US 3886510 A US3886510 A US 3886510A US 390474 A US390474 A US 390474A US 39047473 A US39047473 A US 39047473A US 3886510 A US3886510 A US 3886510A
Authority
US
United States
Prior art keywords
beginning
winding
turn
strip
ending
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
US390474A
Other languages
English (en)
Inventor
Robert E Canup
Jr Earl W Mcpeak
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.)
Texaco Inc
Original Assignee
Texaco 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 Texaco Inc filed Critical Texaco Inc
Priority to US390474A priority Critical patent/US3886510A/en
Priority to JP49049854A priority patent/JPS5049657A/ja
Priority to GB2753174A priority patent/GB1447917A/en
Priority to ZA00744055A priority patent/ZA744055B/xx
Priority to AU71004/74A priority patent/AU483350B2/en
Priority to DE2434581A priority patent/DE2434581A1/de
Priority to CA205,013A priority patent/CA1008520A/en
Priority to NL7409910A priority patent/NL7409910A/xx
Priority to CH1044674A priority patent/CH576693A5/xx
Priority to SE7409857A priority patent/SE401878B/xx
Priority to FR7427576A priority patent/FR2241858B1/fr
Priority to PL1974173534A priority patent/PL95446B1/pl
Priority to BR6828/74A priority patent/BR7406828D0/pt
Priority to IT26453/74A priority patent/IT1020061B/it
Priority to ES429457A priority patent/ES429457A1/es
Application granted granted Critical
Publication of US3886510A publication Critical patent/US3886510A/en
Priority to JP1980077897U priority patent/JPS5752900Y2/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • 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
    • H01F27/2866—Combination of wires and sheets
    • 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

Definitions

  • ABSTRACT A high-voltage output coil for use in an ignition system transformer.
  • the frequency of the input energy is on the order of l0,000 Hertz and is square-wave in form.
  • the coil has a wide strip first turn for preventing insulation burn-out caused by radio-frequency current flow.
  • This invention concerns inductive coil structure, in general. More specifically, it relates to an improvement for a high-voltage secondary winding of a transformer, e.g., a high-frequency, high-voltage transformer adapted to be used in ignition systems.
  • a transformer e.g., a high-frequency, high-voltage transformer adapted to be used in ignition systems.
  • the known type of winding structure employed an insulating sleeve designed to fit over a magnetic core and upon which a large number of turns would be wound. Thus, a large plurality of winding layers would be built up around the insulating sleeve, and the ends of such winding would be brought out for connection to an electrical output circuit. It was discovered that with such structure, when high-frequency square-wave signals were induced in the winding, there was a substantial build-up of radio-frequency energies that would cause breakdown or burn-out of the insulation between winding turns and layers of the windings.
  • this invention concerns a high-voltage inductive coil. It comprises in combination a large plurality of windings including multiturn layers of an electrical conductor for developing a high-voltage output.
  • the first turn of said windings comprises a unitary strip extending substantially over the entire width of said multiturn layers.
  • the invention pertains to a transformer for use with an ignition system that employs a squarewave oscillator operating at a frequency on the order of 10,000 Hertz.
  • the transformer employs a highvoltage output winding having means for avoiding insulation burn-out, which means and winding comprise a core tube for supporting said winding thereon, and the tube is adapted to receive a magnetic core therethrough. It also comprises a conductive-material strip having a beginning and an ending, and being at least as wide as said winding. The said strip is wound around said core tube with said ending overlapping said beginning.
  • the output winding also comprises electrical in sulation means for separating said overlapping portions of said strip.
  • the said winding is wound over said strip with the inner end electrically connected to said strip ending so that said strip forms the first turn of said winding.
  • the winding also comprises means for making an electrical circuit connection to the beginning of said strip.
  • FIG. I is a schematic cross-sectional view illustrating the prior art.
  • FIG. 2 is a schematic cross-sectional view illustrating transformer-winding structure according to the invention.
  • FIG. 3 is a transverse cross-sectional view taken along the lines 3-3 of FIG. 2, looking in the direction of the arrows.
  • Hertz has been accepted as meaning cycles per second in connection with electromagnetic waves of all sorts. Consequently, the term megahertz, of course, means millions of cycles per second. Such meanings will be attributed throughout this application unless a contrary meaning is clearly expressed.
  • radio-frequency harmonics In ignition systems for use with internal combustion engines, the foregoing radio-frequency harmonics have been found to be present on the whole engine and associated equipment.
  • the ground return for such radiofrequency energy is through the frame of the total ignition system equipment and to the ground strap of the transformer which has the foregoing output winding thereon.
  • the magnitude of the radio-frequency energies was sufficient that sparks could be drawn quite widely over the whole engine assembly.
  • this radiofrequency energy included a path such that there would be current flow by capacitive action from the core laminations of the transformer to the winding layers of the transformer beginning with the first.
  • burn-outs may be prevented.
  • FIG. 1 illustrates prior art.
  • a transformer output winding of the type applicable to this invention was wound over a magnetic core 11.
  • the winding was first accomplished by winding on the outside of an insulatingmaterial sleeve 12 that is adapted to fit over the core 11.
  • a plurality of layers of winding turns 15 would be wound over the sleeve 12 in a conventional manner.
  • the prior art structure was subject to a build-up of radio-frequency energies between the winding turns and the ground potential of the core 11 so that radio-frequency currents would flow through the insulating sleeve 12, as indicated by the arrows 22 in FIG. 1. It was found that these currents soon became destructive and caused burn-out of the transformer.
  • FIG. 2 illustrates a transformer coil structure according to this invention and in a similarly schematic manner as the showing of FIG. 1.
  • the spacing between individual turns of the winding is greatly exaggerated, and the drawing is generally not to scale.
  • the transformer structure illustrated includes a magnetic core 25 that may be a conventional laminated magnetic material.
  • a magnetic core 25 Surrounding the core 25, there is an insulating-material sleeve 26. It takes the form of a so-called core tube which is adapted for being fitted closely over the core 25.
  • Such tube 26 may be constructed of any appropriate insulating material, e.g., a good insulating grade of fiber or paper board.
  • a conductive-material strip 29 Surrounding sleeve 26, there is a conductive-material strip 29 that is made of any good conductor, e.g., copper. It has a width sufficient to extend substantially the entire width of a coil 28 that is wound thereover.
  • Strip 29 forms the first complete turn of the transformer winding 28, and it has a beginning and an ending with sufficient length to complete at least a full turn around the sleeve 26 with some overlap. However, there is insulation provided between the overlapping ends so that the strip 29 is not merely a continuous shield, but acts as the first turn of the winding.
  • a conductor 30 Connected to the beginning of strip 29, by any feasible means, there is a conductor 30. It is carried out through the sleeve or core-tube structure for making electrical connection to the inner end of the coil. Thus, as illustrated in FIG. 2, the conductor 30 is grounded by having good electrical connection to core 25. This is schematically indicated by a contact point 31 at the end of the conductor 30. It will be appreciated that other arrangements for making desired electrical connection to the beginning end of the strip 29 might be used. Such other arrangements include the bringing of a narrow portion (not shown) of the strip through the insulating sleeve 26 so as to make good electrical contact with the surface of the core 25.
  • an electrically conductive-material fila ment which is employed in winding additional turns, e.g., windings 34, as illustrated.
  • windings 34 are separated by insulatingmaterial layers 35.
  • This insulation is conventional in form and substance. It may be made of an appropriate type of electrically insulating paper having the full width of the winding structure.
  • a transformer according to this invention which is particularly for use in an ignition system, will be constructed with a total number of turns on the order of 9,000.
  • a transformer according to this invention may also make use of a similar last complete turn.
  • a conductive strip 40 that has its inner end connected to the last of the filament turns 34.
  • an insulating layer e.g., layer 41 that separates the overlap of strip 40 as it goes around far enough to make the full outer turn of the windings.
  • an electrical conductor 42 At the outer, or free end of strip 40, there is an electrical conductor 42 which is brought out in a conventional manner for making the electrical connection to the output circuit of the transformer.
  • Use of a wide outer turn to obtain anticorona effects has been employed in the subject type of transformer Construction as shown in US. Pat. No. 3,394,331 which is assigned to the same assignee as this invention. However, there was no concept relevant to a total transformer structure according to this invention.
  • High-voltage AC inductive coil comprising in combination a large plurality of winding turns beginning at the inside of said coil and including multi-turn layers of an electrical conductor for developing a highvoltage output
  • the first turn of said winding turns comprising a unitary strip having a beginning and an ending and extending laterally substantially the entire width of said multiturn layers, said ending overlapping said beginning and being insulated at said area of overlap, and
  • An inductive coil according to claim 1 further comprising first electrically insulating sleeve means for supporting said windings and being adapted to receive a magnetic core therein.
  • An inductive coil according to claim 2 further comprising second insulating means located between each of said layers, and third insulating means for separating each turn of said conductor from the others.
  • An inductive coil according to claim 3 further comprising electrically conductive means for connecting said lead conductor of said first turn to ground. 5.
  • An inductive coil according to claim 4 further comprising at least a last turn of said winding turns comprising a unitary strip having a beginning and ending and extending laterally substantially the entire width of said multiturn layers, said ending overlapping said beginning and being insulated at said area of overlap, and means for connecting a lead conductor to the outside end of said coil.
  • High-voltage AC inductive coil adapted for use in a secondary winding of a transformer for use in an ignition system including a continuous square-wave-type oscillator, comprising in combination a large plurality of winding turns beginning at the inside of said coil and including multiturn layers of an electrical conductor for developing a high-voltage output, at least the first complete turn of said winding turns comprising a unitary strip having a beginning and an ending and extending laterally substantially the entire width of said multiturn layers, said ending overlapping said beginning and being insulated at said area of overlap,
  • At least a last complete turn of said winding turns comprising a unitary strip having a beginning and an ending and extending laterally substantially the entire width of said multiturn layers and said ending overlapping said beginning and being insulated at said area of overlap, and
  • said ground including said magnetic core.
  • a transformer for use with an ignition system, employing a square-wave oscillator operating a frequency on the order of l0,000 Hertz, a high voltage AC output winding having means for avoiding insulation burnout, comprising a core tube for supporting said winding thereon and adapted to receive a magnetic core therethrough, a conductive-material strip forming the inside first turn of said winding and having a beginning and an ending and being at least as wide as said winding,
  • said strip being wound around said core tube with said ending overlapping said beginning
  • said means for making an electrical circuit connection comprises a circuit connection to said magnetic core.
  • said means for avoiding insulation burn-out also comprises a second conductive-material strip forming at least the last turn of said winding and having a beginning and an ending and being at least as wide as said winding,
  • said second strip being wound around the outside of said winding with said beginning electrically connected to the outside end of said winding
  • said second strip being more than one full turn of said winding and electrical insulating means for separating said overlapping portions of said second strip.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Insulating Of Coils (AREA)
  • Regulation Of General Use Transformers (AREA)
  • Coils Of Transformers For General Uses (AREA)
US390474A 1973-08-22 1973-08-22 High-voltage inductive coil Expired - Lifetime US3886510A (en)

Priority Applications (16)

Application Number Priority Date Filing Date Title
US390474A US3886510A (en) 1973-08-22 1973-08-22 High-voltage inductive coil
JP49049854A JPS5049657A (xx) 1973-08-22 1974-05-07
GB2753174A GB1447917A (en) 1973-08-22 1974-06-21 High-voltage inductive coil
ZA00744055A ZA744055B (en) 1973-08-22 1974-06-24 High-voltage inductive coil
AU71004/74A AU483350B2 (en) 1973-08-22 1974-07-08 High-voltage inductive coil
DE2434581A DE2434581A1 (de) 1973-08-22 1974-07-18 Hochspannngs-induktionsspule
CA205,013A CA1008520A (en) 1973-08-22 1974-07-18 High-voltage inductive coil
NL7409910A NL7409910A (nl) 1973-08-22 1974-07-23 Hoogspannings inductiespoel.
CH1044674A CH576693A5 (xx) 1973-08-22 1974-07-30
SE7409857A SE401878B (sv) 1973-08-22 1974-07-31 Induktiv spole
FR7427576A FR2241858B1 (xx) 1973-08-22 1974-08-08
PL1974173534A PL95446B1 (pl) 1973-08-22 1974-08-17 Uzwojenie wysokonapieciowe cewki zaplonowej
BR6828/74A BR7406828D0 (pt) 1973-08-22 1974-08-19 Bobina de inducao de alta voltagem
IT26453/74A IT1020061B (it) 1973-08-22 1974-08-21 Bobina induttiva ad alta tensione
ES429457A ES429457A1 (es) 1973-08-22 1974-08-22 Bobina de induccion de alta tension.
JP1980077897U JPS5752900Y2 (xx) 1973-08-22 1980-06-03

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US390474A US3886510A (en) 1973-08-22 1973-08-22 High-voltage inductive coil

Publications (1)

Publication Number Publication Date
US3886510A true US3886510A (en) 1975-05-27

Family

ID=23542605

Family Applications (1)

Application Number Title Priority Date Filing Date
US390474A Expired - Lifetime US3886510A (en) 1973-08-22 1973-08-22 High-voltage inductive coil

Country Status (14)

Country Link
US (1) US3886510A (xx)
JP (2) JPS5049657A (xx)
BR (1) BR7406828D0 (xx)
CA (1) CA1008520A (xx)
CH (1) CH576693A5 (xx)
DE (1) DE2434581A1 (xx)
ES (1) ES429457A1 (xx)
FR (1) FR2241858B1 (xx)
GB (1) GB1447917A (xx)
IT (1) IT1020061B (xx)
NL (1) NL7409910A (xx)
PL (1) PL95446B1 (xx)
SE (1) SE401878B (xx)
ZA (1) ZA744055B (xx)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4176335A (en) * 1977-10-25 1979-11-27 Burroughs Corporation Electrical conducting apparatus
US4333900A (en) * 1977-12-02 1982-06-08 Chloride Electro Networks, Division Of Chloride, Inc., N. American Operation Process for manufacture of high voltage transformers and the like
US4755783A (en) * 1986-11-18 1988-07-05 Rogers Corporation Inductive devices for printed wiring boards

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6244511Y2 (xx) * 1980-11-17 1987-11-25

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2728879A (en) * 1950-11-18 1955-12-27 Gen Electric Electrical coil

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS448652Y1 (xx) * 1966-03-04 1969-04-08

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2728879A (en) * 1950-11-18 1955-12-27 Gen Electric Electrical coil

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4176335A (en) * 1977-10-25 1979-11-27 Burroughs Corporation Electrical conducting apparatus
US4333900A (en) * 1977-12-02 1982-06-08 Chloride Electro Networks, Division Of Chloride, Inc., N. American Operation Process for manufacture of high voltage transformers and the like
US4755783A (en) * 1986-11-18 1988-07-05 Rogers Corporation Inductive devices for printed wiring boards

Also Published As

Publication number Publication date
ES429457A1 (es) 1976-09-01
SE7409857L (xx) 1975-02-24
NL7409910A (nl) 1975-02-25
FR2241858A1 (xx) 1975-03-21
SE401878B (sv) 1978-05-29
JPS5049657A (xx) 1975-05-02
JPS55167633U (xx) 1980-12-02
JPS5752900Y2 (xx) 1982-11-17
BR7406828D0 (pt) 1975-06-17
CA1008520A (en) 1977-04-12
FR2241858B1 (xx) 1980-08-14
PL95446B1 (pl) 1977-10-31
DE2434581A1 (de) 1975-03-06
ZA744055B (en) 1975-11-26
GB1447917A (en) 1976-09-02
AU7100474A (en) 1976-01-08
IT1020061B (it) 1977-12-20
CH576693A5 (xx) 1976-06-15

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