US3760315A - Electrical coil with spacing bands - Google Patents

Electrical coil with spacing bands Download PDF

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Publication number
US3760315A
US3760315A US00203602A US3760315DA US3760315A US 3760315 A US3760315 A US 3760315A US 00203602 A US00203602 A US 00203602A US 3760315D A US3760315D A US 3760315DA US 3760315 A US3760315 A US 3760315A
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United States
Prior art keywords
coil
bands
cord wrapping
turns
adjacent turns
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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
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US00203602A
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English (en)
Inventor
H Hartmann
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.)
BBC Brown Boveri AG Switzerland
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Bbc Brown Boveri & Cie
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Application filed by Bbc Brown Boveri & Cie filed Critical Bbc Brown Boveri & Cie
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F37/00—Fixed inductances not covered by group H01F17/00
    • H01F37/005—Fixed inductances not covered by group H01F17/00 without magnetic core
    • 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

Definitions

  • An electrical impedance coil which has a helical configuration has applied to the outer surface thereof a plurality of circumferentially spaced bands of insulating material and which extend longitudinally of the coil.
  • a cord wrapping applied around the bands at the helical interspace formed between adjacent turns of the coil serves to draw in those portions of the bands into this interspace so as to lie between adjacent turns and the bands in conjunction with the binding-in effect produced by the cord wrapping serve to mechanically reinforce the coil against disruptive forces which occur whent'he coil is required to carry high currents.
  • a rotatable mandrel arrangement is provided in connection with manufacture of the coil, the mandrel serving to form the electrical conductor into helical form, and as a support for the supply rolls of the band material to be applied to the outer surface of the bands, after which the cord wrapping is applied as the mandrel is rotated.
  • the present invention relates to an improved construction for an air-cooled electrical coil of the impedance, or choke type which is utilized as a wave block or to limit current flow in the case of a short-circuit condition on the line to which the coil is connected.
  • the invention also is directed to a method for manufacturing the coil as well as an apparatus by which the method can be performed.
  • Electrical impedance coils are also customarily mounted in air, in contrast to a solid orliquid medium,
  • the primary objective of the present invention is to provide an improved helical impedance coil construction which obviates the disadvantages of the previously known techniques and which can be produced at a comparatively low cost and in a continuous manner on a comparatively simply. constructed winding machine.
  • the improved helical impedance coil structure is principally characterized in that a plurality of bands of insulating material distributed over the circumference in spaced relation extend longitudinally alongthe outer surface of the coil and the portions of these bands between adjacent coil turns are drawn in, so as to lie in the gap between the turns, by means of a cord wrapping also of insulating material.
  • the bands and cord wrapping provide adequate mechanical reinforcement for the coil and the spacing between adjacent bands ensures an adequate flow of cooling air through the coil.
  • the method by which the improved impedance coil structure is produced resides principally in the-features that after the helical coil is wound, the circumferentially distributed-bands of insulating material are applied longitudinally along the surface of the coil, this being followed by application of the cord wrapping in for a sliding movement longitudinally of the mandrel and spring loaded-so as to enable the band material to be placedunder longitudinal tension, and there being also provided a reel on which a wound-upsupply ofthe cord material is stored and fed to and-wrapped around the bands.
  • FIG. 3 is also a vertical section of a portion of a coil similar to FIG. 2 but illustrating a modification of the latter with respect to the spatial arrangement of the band material and cord wrapping between adjacent turns;
  • FIG. 4 is a view in central longitudinal section through an apparatus by which the method for producing the" coil'in accordance with the invention can be performed.
  • each coil constructed in accordance with the invention consists of a helically wound electrical conductor 3 so as to provide spacing between adjacent turns of the helix, a plurality of bands 4 of insulating material distributed around the outersurface of the coil in circumferentially spaced relation and which extend longitudinally along the coil, and accordingly wrapping 5 also of insulating material applied to the bands 4 at a right angle to the latter and which serves to bind and draw portions of the bands into the interspaces between adjacent turns of they coil.
  • the bands 4 and cord wrapping 5 are materials having a high tensile strength and an impregnatable structure, such as fiberglass fabrics for the bands and fiberglass rovings from which the cord is made and which facilitate bonding of the bands and cord together, after application to the coil.
  • materials having a high tensile strength and an impregnatable structure such as fiberglass fabrics for the bands and fiberglass rovings from which the cord is made and which facilitate bonding of the bands and cord together, after application to the coil.
  • the usual auxiliary mounting components such, as spacers 16 extending longitudinally in the annular gap between the inner and outer coils, annular plates]? at which opposite ends of the spacers 16 terminate, and end plates 18 provided with centrally located openings for receiving a clamping bolt 19 for holding the entire-assembly together.
  • the electrical connections between the two coils are conventional and hence have not been included. While the FIG.
  • the invention can obviously be applied to single coil structures since each of .3 of the coil, and that the greater portion of the interspace between adjacent turns is filled out by the cord wrapping 5. Also, it will be seen that the band material 4 is so drawn inwardly by the binding force applied by the'cord wrapping-that it reaches to the inner peripheral surface of the coil.
  • the distance between adjacent turns 3 of the conductor corresponds to substantially twice the thickness of the" band material 4'so that the cord wrapping 5 accounts for only a very small part of the overall profile between adjacent conductor turns.
  • the conductors 3 In cases where the compressive forces acting in an axial direction upon the coil are very great when a short-circuit current flows through the coil, the conductors 3 must be supported over their entire circumference by the cord wrapping 5 which act as bandages, in their overall effect. At the same time the cord wrapping 5 helps to absorb the explosive forces Z acting in the direction indicated in FIG. 2 on the conductor turns 3 when a short-circuit current flows which tends to expand the windings radially. it suffices to lead a correspondingly less number of the bands 4, dimensioned thicker in this case, over the surface of the coil while the cord wrapping 5 serves less to absorb the shortcircuit forces than to draw the bands 4 into the gaps between adjacent turns of the coil.
  • the cooling air sweeps along as little as possible covered inner and outer sides of the coil, whereas, in FIG. 3 the cooling air, additionally has free passage between the conductor turns at the places on the periphery of the coil where there are no bands 4. Both embodiments thus provide adequate absorption of the forces occurring in the event of a short-circuit, in the axial and also the radial directions of the coil and under relatively favorable cooling conditions.
  • FIG. 4 Relatively simple apparatus-for applying the bands and cord wrapping to the coil is illustrated in FIG. 4.
  • a cylindrical mandrel 8 is provided and arranged for rotation about the axis 7, and the conductor material is wound about the surface of this mandrel toestablish the desired helical form for the coil.
  • Reels9 are provided at one end of mandrel 8 for mounting supply rolls of the band material 4.
  • these two materials which, as previously indicated are preferably made from fiberglass, or some other similar strong and impregnatable material, are then glued together such as by use of solvent-free synthetic resins such as epoxy or polyester resins which upon solidification establish-a strong bond between the bands and cord wrapping. These resins may be applied to the bands and cord wrapping either before or after application to the coil.
  • the coil When winding the coil, it may be wound on the mandrel with a pitch greater than the final desired spacing between adjacent turns and then compressed to the final pitch after application of the bands and cord wrapping. It is also possibleto wind the coil with its final pitch, in which event the bands 4 and coil wrapping 5 can be applied progressively as the coil is wound rather than after completion of the coil winding operation.
  • An electrical impedance comprising a helically wound conductor coil, a plurality of bands of insulating material distributed over the outer surface of said coil in circumferentially spaced relation and which extend in a generally longitudinal direction of the coil, and a cord wrapping of insulating material applied to said bands at the portions thereof between adjacent turns of the coil and which serves to draw in those band portions so as to lie in the gap between the adjacent turns.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulating Of Coils (AREA)
  • Coils Of Transformers For General Uses (AREA)
US00203602A 1970-12-07 1971-12-01 Electrical coil with spacing bands Expired - Lifetime US3760315A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1811770A CH524878A (de) 1970-12-07 1970-12-07 Verfahren zur Herstellung einer Spule und Vorrichtung zur Durchführung des Verfahrens

Publications (1)

Publication Number Publication Date
US3760315A true US3760315A (en) 1973-09-18

Family

ID=4430555

Family Applications (1)

Application Number Title Priority Date Filing Date
US00203602A Expired - Lifetime US3760315A (en) 1970-12-07 1971-12-01 Electrical coil with spacing bands

Country Status (5)

Country Link
US (1) US3760315A (de)
CA (1) CA949144A (de)
CH (1) CH524878A (de)
DE (2) DE7100452U (de)
ZA (1) ZA718138B (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4167011A (en) * 1976-12-22 1979-09-04 Hustler, Inc. Radio antenna construction
DE3305007A1 (de) 1983-01-27 1984-08-09 BBC Aktiengesellschaft Brown, Boveri & Cie., Baden, Aargau Luftdrosselspule und verfahren zu ihrer herstellung
US5309105A (en) * 1991-07-10 1994-05-03 Hitachi, Ltd. Vibration reduction system for magnetic-resonance imaging apparatus
US20040134480A1 (en) * 2003-01-07 2004-07-15 Micropyretics Heaters International (Mhi) Inc. Convective system
US20070145038A1 (en) * 2003-01-07 2007-06-28 Micropyretics Heaters International, Inc. Convective heating system for industrial applications
US20140110398A1 (en) * 2012-10-24 2014-04-24 Tokyo Electron Limited Heater apparatus
CN109712802A (zh) * 2019-02-19 2019-05-03 山东电力设备有限公司 一种饼式线圈贯穿性链式绑扎的方法
US11515070B2 (en) * 2018-06-21 2022-11-29 Murata Manufacturing Co., Ltd. Coil component

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3012496C2 (de) * 1980-03-31 1982-02-25 Siemens AG, 1000 Berlin und 8000 München Durch Verbacken des gewickelten Wikklungsdrahtes mit einem backfähigem Depotmaterial verfestigte Spulenwicklung
FR2481856A1 (fr) * 1980-05-05 1981-11-06 Neiman Leonid Procede de fabrication d'un bobinage a couches multiples pour un induit sans encoches de machine electrique
EP0600612A1 (de) * 1992-11-05 1994-06-08 Bba Canada Limited Luftdrasselspule mit fest zu einer Strukturhülse verankerter Leiterwicklung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1959543A (en) * 1931-11-10 1934-05-22 Telefunken Gmbh Tuning coil
US2213093A (en) * 1937-03-25 1940-08-27 Gen Electric Meter potential coil

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1959543A (en) * 1931-11-10 1934-05-22 Telefunken Gmbh Tuning coil
US2213093A (en) * 1937-03-25 1940-08-27 Gen Electric Meter potential coil

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4167011A (en) * 1976-12-22 1979-09-04 Hustler, Inc. Radio antenna construction
DE3305007A1 (de) 1983-01-27 1984-08-09 BBC Aktiengesellschaft Brown, Boveri & Cie., Baden, Aargau Luftdrosselspule und verfahren zu ihrer herstellung
US4538131A (en) * 1983-01-27 1985-08-27 Bbc Brown, Boveri & Company, Ltd. Air-core choke coil
US5309105A (en) * 1991-07-10 1994-05-03 Hitachi, Ltd. Vibration reduction system for magnetic-resonance imaging apparatus
US20040134480A1 (en) * 2003-01-07 2004-07-15 Micropyretics Heaters International (Mhi) Inc. Convective system
US20070145038A1 (en) * 2003-01-07 2007-06-28 Micropyretics Heaters International, Inc. Convective heating system for industrial applications
US8119954B2 (en) 2003-01-07 2012-02-21 Micropyretics Heaters International, Inc. Convective heating system for industrial applications
US20140110398A1 (en) * 2012-10-24 2014-04-24 Tokyo Electron Limited Heater apparatus
US11515070B2 (en) * 2018-06-21 2022-11-29 Murata Manufacturing Co., Ltd. Coil component
CN109712802A (zh) * 2019-02-19 2019-05-03 山东电力设备有限公司 一种饼式线圈贯穿性链式绑扎的方法
CN109712802B (zh) * 2019-02-19 2020-12-22 山东电力设备有限公司 一种饼式线圈贯穿性链式绑扎的方法

Also Published As

Publication number Publication date
DE2100629C3 (de) 1975-07-31
CH524878A (de) 1972-06-30
CA949144A (en) 1974-06-11
DE2100629B2 (de) 1974-12-12
DE2100629A1 (de) 1972-06-15
DE7100452U (de) 1972-11-30
ZA718138B (en) 1972-08-30

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