US3870982A - Impregnated electromagnetic coil having a layer voltage applied thereto - Google Patents

Impregnated electromagnetic coil having a layer voltage applied thereto Download PDF

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Publication number
US3870982A
US3870982A US347041A US34704173A US3870982A US 3870982 A US3870982 A US 3870982A US 347041 A US347041 A US 347041A US 34704173 A US34704173 A US 34704173A US 3870982 A US3870982 A US 3870982A
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US
United States
Prior art keywords
coil
electromagnetic coil
insulating
elementary
insulating sheet
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
US347041A
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English (en)
Inventor
Takashi Shibano
Koichi Hirakawa
Toshimitsu Yonehara
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
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Publication of US3870982A publication Critical patent/US3870982A/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

Definitions

  • ABSTRACT A novel electromagnetic coil is provided which is manufactured by placing and fixing an impregnable insulating material in such a manner that the insulating material contacts the whole surface of each side of an elementary electromagnetic coil consisting of a wire or self-bonding wire, to each side of which is applied a layer voltage, and then impregnating an impregnant into the elementary coil.
  • the electromagnetic coil according to this invention ensures an improved working property in the manufacture of coils, reduction in manufacturing cost and an improved space factor.
  • the present invention relates to an electromagnetic coil having an improved insulating property and a method for manufacturing the same.
  • a drawback of these conventional electromagnetic coils is that the use of the interlayer insulating material causes a deteriorated working property in the manufacture and moreover a low space factor of the electromagnetic coil has prevented the realization of smaller and more compact apparatus.
  • FIG. 1 is a perspective view of an elementary electromagnetic coil employed with the present invention
  • FIG. 2 is a partial perspective view of the elementary coil which has been provided with an insulating material but not yet subjected to the process of impregnation;
  • FIG. 3 is a perspective view of another embodiment of the elementary electromagnetic coil of this invention which is composed of a self-bonding wire;
  • FIG. 4 is a schematic diagram showing in crosssection the coils of FIG. 2.
  • FIG. 1 shows an elementary electromagnetic coil comprising a wire of the type which is commonly used.
  • numeral 1 designates a wire which is suitably selected depending on the actual operating temperature of an apparatus and the environment in which 'it is used.
  • Class E insulating materials in terms of heat resisting properties, polyvinyl formal wire has been used widely. Those which have slightly higher heat resisting properties include epoxy wire, polyester wire, etc. Polyesterimide wire, heat resistant polyester wire, polyimide wire, etc., have still higher heat resist ing properties.
  • Numeral 2 designates lead wires which are normally used by connecting intermedially with an insulated wire having reinforced mechanical and electric insulating properties.
  • Numeral 3 designates an adhesive insulating tape.
  • the insulating tape 3 is provided on the coil at predetermined places to prevent the loosening of the coil. It is essential that the properties of the insulating tape 3 are such that it possesses an excellent adaptability with the wire and other component materials with which it contacts in the actual working surroundings. More particularly, Nomex (trademark for a heat-resistant nylon manufactured by E. I. du Pont de Nemours and Company) including silicone resin as an adhesive may be used advantageously, if the wire cornprises polyimide wire, polyesterimide wire or polyamideimide wire and if the varnish used to impregnate the electromagnetic coil comprises epoxy resin, polyester resin or silicone resin.
  • glass cloth having an adhesive e.g., epoxy resin applied thereon or Nomex using the similar resin as an adhesive may lend itself to be an excellent insulating tape, if the wire comprises epoxy wire or polyester wire and if the varnish comprises similarly polyester resin, epoxy resin or phenol resin.
  • an adhesive e.g., epoxy resin applied thereon or Nomex using the similar resin as an adhesive
  • the wire comprises epoxy wire or polyester wire
  • the varnish comprises similarly polyester resin, epoxy resin or phenol resin.
  • numeral 4 designates an insulating material which is preferably such a porous material that a maximum contact area is ensured between the coil side and the insulating material.
  • the wire at the coil side receives the voltage for two layers and the voltage increases as the distance between the coil side and the insulating material increases, thus tending to cause corona discharge, surface tracking or arc discharge.
  • the wire segments comprising the coil 1 are designated by the numerals l to 24 and the layers of the wound coil are indicated by the letters a to d. If a voltage V is applied across the coil, then the voltages impressed between the wires I and 2, 2 and 3 22 and 23, and 23 and 24 respectively v/24.
  • the layer voltage appliedbetween the wires 1 and I2, 7 and 18 and 13 and 24 is equal to l2/24V. That is, the layer voltage, which is higher than the voltages between the wires, is applied between the coil sides.
  • kao wool ceramic fiber
  • glass fiber mat glass fiber mat
  • polyethylene terephthalate nonwoven fabric etc.
  • Numeral 6 designates an insulating tape for tightly fitting the materials 4 and 5 on the coil sides.
  • Numeral 7 designates an insulating material which is effective when a high electric field is applied to the coil and its exterior and it is also essential that the insulating material 7 is such that it fits tightly on the coil and is readily impregnable so as to leave voids-free between the coil and the insulating material 7. For this reason, a material having the similar property as the insulating sheet 4 may be preferred. If a layer of air is allowed between the insulating material 7 and the elementary coil, the corona discharge in the voids causes the breakdown of the insulating layer and shortens the life of the coil.
  • a material having a good electrical insulating property and porosity may be suited for the highly resilient material 5, since the porosity ensures an improved impregnation of the impregnant into the coil. More specifically, asbestos, porous sheet material and the like meet these essential requirements. However, the resilient material needs not always be of porous nature. More specifically, it may be a molded plate of epoxy resin, polyester resin or phenol resin, or a laminated plate of glass fibers employing any of these resins.
  • the impregnating varnish may consist of epoxy resin, unsaturated polyester resin, silicone resin or the like, while mineral oil, silicone oil or the like may provide a suitable liquid impregnant that may be employed to impregnate the coil after it has been assembled in an apparatus and housed in a casing.
  • the elementary wire shown in FIG. 1 may comprise a self-bonding wire 1' as shown in FIG. 3.
  • the electromagnetic coil according to the present invention ensures an improved reliability and makes the process of product design easier owing to its simplified structure and the resultant decrease in the variations of the electrical properties with different electromagnetic coils.
  • An electromagnetic coil comprising an elementary electromagnetic coil composed of a self-bonding electric wire wound in the form of a plurality of layers and having no interlayer insulating paper; impregnable ring-shaped insulating sheets closely fitted to and secured on each side of said elementary coil, to which a layer voltage is applied, to allow said wire at each of said coil sides to be embedded in one of said insulating sheets; and a varnish impregnated and hardened in said. elementary coil to make the electromagnetic coil voidfree between said coil sides and said insulating sheets to prevent an arc discharge from being generated between coil layers along a surface of each of said coil sides.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulating Of Coils (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
US347041A 1972-03-31 1973-04-02 Impregnated electromagnetic coil having a layer voltage applied thereto Expired - Lifetime US3870982A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47032781A JPS4899647A (fr) 1972-03-31 1972-03-31

Publications (1)

Publication Number Publication Date
US3870982A true US3870982A (en) 1975-03-11

Family

ID=12368381

Family Applications (1)

Application Number Title Priority Date Filing Date
US347041A Expired - Lifetime US3870982A (en) 1972-03-31 1973-04-02 Impregnated electromagnetic coil having a layer voltage applied thereto

Country Status (4)

Country Link
US (1) US3870982A (fr)
JP (1) JPS4899647A (fr)
CA (1) CA1013824A (fr)
GB (1) GB1415225A (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3990029A (en) * 1974-05-29 1976-11-02 Hitachi, Ltd. Insulated windings provided with a mould releasing material
US4137515A (en) * 1974-09-19 1979-01-30 Matsushita Electric Industrial Co., Ltd. Synthetic resin packed coil assembly
US4472699A (en) * 1981-07-20 1984-09-18 Takamisawa Electric Co., Ltd. Electromagnetic relay
US6228494B1 (en) * 1998-12-02 2001-05-08 Siemens Westinghouse Power Corporation Method to reduce partial discharge in high voltage stator coil's roebel filler
US6724118B2 (en) * 2001-06-13 2004-04-20 Siemens Westinghouse Power Corporation Electrical isolation layer system strand assembly and method of forming for electrical generator
US20050046534A1 (en) * 2003-07-08 2005-03-03 Gilmartin Michael T. Form-less electronic device and methods of manufacturing

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50151303A (fr) * 1974-05-27 1975-12-05
CN105097234B (zh) * 2015-08-13 2017-05-24 王永法 一种抗短路非晶合金油浸式变压器的制备方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2489867A (en) * 1946-06-13 1949-11-29 Belmont Radio Corp Method for making electrical coils
US2814581A (en) * 1955-08-08 1957-11-26 Gen Electric Self-supporting electromagnetic coil

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2489867A (en) * 1946-06-13 1949-11-29 Belmont Radio Corp Method for making electrical coils
US2814581A (en) * 1955-08-08 1957-11-26 Gen Electric Self-supporting electromagnetic coil

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3990029A (en) * 1974-05-29 1976-11-02 Hitachi, Ltd. Insulated windings provided with a mould releasing material
US4137515A (en) * 1974-09-19 1979-01-30 Matsushita Electric Industrial Co., Ltd. Synthetic resin packed coil assembly
US4472699A (en) * 1981-07-20 1984-09-18 Takamisawa Electric Co., Ltd. Electromagnetic relay
US6228494B1 (en) * 1998-12-02 2001-05-08 Siemens Westinghouse Power Corporation Method to reduce partial discharge in high voltage stator coil's roebel filler
US6724118B2 (en) * 2001-06-13 2004-04-20 Siemens Westinghouse Power Corporation Electrical isolation layer system strand assembly and method of forming for electrical generator
US20050046534A1 (en) * 2003-07-08 2005-03-03 Gilmartin Michael T. Form-less electronic device and methods of manufacturing
US7598837B2 (en) 2003-07-08 2009-10-06 Pulse Engineering, Inc. Form-less electronic device and methods of manufacturing
US20100026438A1 (en) * 2003-07-08 2010-02-04 Gilmartin Michael T Form-less electronic device assemblies and methods of operation
US7876189B2 (en) 2003-07-08 2011-01-25 Pulse Engineering, Inc. Form-less electronic device assemblies and methods of operation
US8098125B2 (en) 2003-07-08 2012-01-17 Pulse Electronics, Inc. Form-less electronic device assemblies and methods of operation
US8368500B2 (en) 2003-07-08 2013-02-05 Pulse Electronics, Inc. Form-less electronic device assemblies and methods of operation
US8643456B2 (en) 2003-07-08 2014-02-04 Pulse Electronics, Inc. Form-less electronic device assemblies and methods of operation

Also Published As

Publication number Publication date
CA1013824A (en) 1977-07-12
JPS4899647A (fr) 1973-12-17
GB1415225A (en) 1975-11-26

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