US3245015A - Coverings of coil windings of electrical apparatus - Google Patents

Coverings of coil windings of electrical apparatus Download PDF

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Publication number
US3245015A
US3245015A US211495A US21149562A US3245015A US 3245015 A US3245015 A US 3245015A US 211495 A US211495 A US 211495A US 21149562 A US21149562 A US 21149562A US 3245015 A US3245015 A US 3245015A
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US
United States
Prior art keywords
coil
cellulose
turns
coating
slip 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
US211495A
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English (en)
Inventor
Tanner Edward Butler
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.)
Pinchin Johnson and Associates Ltd
ZF International UK Ltd
Original Assignee
Lucas Industries Ltd
Pinchin Johnson and Associates Ltd
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 Lucas Industries Ltd, Pinchin Johnson and Associates Ltd filed Critical Lucas Industries Ltd
Application granted granted Critical
Publication of US3245015A publication Critical patent/US3245015A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/48—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances fibrous materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
    • H01B3/04—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances mica
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/06—Insulation of windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/32—Windings characterised by the shape, form or construction of the insulation
    • H02K3/325—Windings characterised by the shape, form or construction of the insulation for windings on salient poles, such as claw-shaped poles
    • 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

Definitions

  • the invention is capable of wide application but is especially suitable for the covering of field coils of dynamos.
  • the usual covering for such coils has long been helically wound tape. After taping, the coils are curved in a press to suit the contour of the dynamo yoke.
  • the present invention consists in a method of covering coil windings of electrical apparatus prior to forming or shaping the coils which comprises applying to the outside of the coil a slip coating and then applying over the slip coating an outer coating which provides a relatively strong flexible skin, the arrangement being such that during subsequent forming of the coil so covered the outer coating can move relatively to the turns of the coil.
  • the slip coating preferably comprises a soft filling composition which enters the interstices between at least the outside turns of the coil so as to reduce the surface irregularities of the coil surface over which the outer coating is applied.
  • the filling composition prevents partial penetration of the outer coating between the wires of the coil so that on forming of the coil the skin is not locally stressed by being forced to follow local movement among the wires nor is movement and rearrangement of the wires within the coil hindered.
  • the skin is of more uniform thickness resulting in economy of outer coating material and reducing stress concentration, which could be caused by local stretching of the skin. Residual stresses in the skin are thus minimised so reducing the risk that the skin might crack or split in service after losing some of its initial elasticity through ageing or heat.
  • a filling composition which is soft is meant one which comprises pulverulent material and has a low degree of cohesion owing to its being substantially unbound or underbound that is to say the amount of binder present in the finished filling composition is substantially less than that needed to fill completely the interstices between the powder particles, without voids.
  • the powders should,-in general, be cheap, fine and inert.
  • a wide range of powders may be used, for example, powders generally used as paint extenders.
  • a coloured filling acoloured pigment in powder form may be included or constitute the pulverulent Component of the filling composition. Powders having unsuitable properties such as volatility, low melting point, or chemical reactivity with the outer coating composition or the metal of the wire of the coil or its insulation should naturally .be excluded. Electrically conductive powders would also normally not be used.
  • powders in which the particles have another than spheroidal shape, such as those which are lamellar,'needle-like or irregular in shape, for example asbestine, diatomaceous earth, mica, talc and china clay.
  • particles which are of less marked- 2 1y lamellar, needle-like or irregular shape could be used, for example barytes, pumice, precipitated or natural calcium carbonate, magnesium carbonate and silica.
  • talc may be used as the filling composition without a binder. They may be rubbed into the interstices between the wires dry and will lodge there by their own natural cohesion. In general however a liquid vehicle is preferred. The filling composition may then be applied by dipping, brushing, spraying, wipingor in some other suitable manner.
  • Binders for the filling composition may be those which when dissolved or dispersed in volatile liquids give to the composition a consistency suited to the desired method of application when present in only minor proportions.
  • One group of substances suitable as binders are these used as thickeners in emulsion paints such as cellulose ethers and the sodium salt of carboxymethyl cellulose.
  • cellulose ethers are ethyl hydroxyethyl cellulose, methylcellulose and hydroxyethyl' methyl cellulose and methyl ethyl cellulose.
  • Further substances suitable as binders are natural and synthetic rubbers, polyvinyl resins, polyacrylic and methacrylic resins and alginates, for example, sodium alginate.
  • the binder and the volatile liquid vehicle must be harmless to the metal of the wire of the coil or its insulation, and, when dry, to the outer coating composition.
  • the outer coating may be of any of a variety of compositions. It may, for example be (1) A plastisol or organosol (2) Arubber-resin composition (3) A composition in which a vinyl resin emulsion is v the binder.
  • FIGURE 3 is an end view similar to FIGURE 2 but after forming.
  • FIGURE 4 is a fragmentary cross-sectional view on line 4-4 of FIGURE 3.
  • a coil winding 5 of enamel insulated copper wire is wound in fiat form as illustrated in FIGURES 1 and 2.
  • a slip coating 6 is applied over its outer turns 7 to reduce the surface irregularities of the coil and provide a smooth surface over which a relatively strong, flexible outer coating 8 is applied.
  • After covering the coil it is formed or shaped in a press or by rollers to the curved form shown in FIGURE 3.
  • the slip coating is formed by a soft filling composition as previously defined.
  • Specific examples of coverings applicable to such coils are:
  • the phenyl mercurial radical is combined with dinaphthyl methane disulphonic acid.
  • the sodium hexametaphosphate is a water softener and the polyethylene glycol 300 monoleate a flow promoting agent.
  • a coil was dipped in this composition, allowed to dry in an oven at 150 F., and allowed to cool. It was then dipped in an organosol coating composition consisting of polyvinyl chloride dispersed in an epoxidised vegetable oil, together with minor proportions of lead stabiliser and an anti-oxidant. The coated coil was then stoved at 390 F. No splits developed in the top coating on forming, or on clamping under a pole piece within a yoke and heating in an oven for 64 hours at 302 F. 4
  • Example 2 Propiofan 5D 500 Water 100 and allowed to dry for .16 hours in an oven at 150 F.
  • Propiofan 5D is an approximately 50% plasticiser-free dispersion of polyvinyl propionate manufactured by the Badische Anilin & Soda Fabrik A.G.
  • the coil When cold the coil was formed by compressing it within a screw press having a fixed horizontal semi-cylindrical outer component of diameter 3% inches, and a moving cylindrical inner component of diameter 2% inches. The coil was first gently squeezed by hand diametrically so as to fit within the jaws of the outer component.
  • Example 3 Micronised talc powder was rubbed by hand into the interstices between the outer turns of a coil similar to that described in Example 2. The powder lodged by its natural cohesion so as to present a smooth and geometrically regular outer surface.
  • the coil so prepared was dipped in the'Propiofan 5D composition as described in Example 2.
  • the coating was allowed to dry for 16 hours in the oven at 150 F. When cold the coil was formed in the screw press'as described in Example 2. No splits developed in the outer coating.
  • a curved electrical coil the individual turns of which are enamel insulated having over the -turns of the coil lining a slip coating consisting of the following ingredients in the parts by weight specified:
  • Wate.rsoluble fungicide comprising a phenyl mercurial radical combined with dinaphthyl methane disulphonic acid group 2.6
  • a curved electrical coil having over the outer turns of the coil a slip coating comprising a powder selected from the group consisting or" asbestine, diatomaceous earth, mica, talc, and china clay and a binder of cellulose ether selected from the groups consisting of ethyl hydroxyethyl cellulose, methyl cellulose, hydroxyethyl methyl cellulose and methyl ethyl cellulose, the slip coating entering the interstices between at least the outside turns of the coil so as to reduce the surface irregularities of the coil surface, and having over the slip coating an .outer relatively strong, flexible skin.
  • the process of forming on the coil a protective covering which is capable of moving relative to the turns of the coil and which conforms with the shape of the coil during subsequent bending comprises applying to the outer surface of the coil a layer of slip material completely covering the outer turns of the coil, and then applying over the layer of slip material, a coating of a material providing a relatively strong flexible skin and then bending the cell from the flat form into a curved form.
  • said layer of slip material comprises a soft filling composition which includes a pulverulent material and has a low degree of cohesion and which enters the interstices between at least the outside turns of the coil so as to reduce the surface irregularities of the coil surface.
  • said layer of slip material consists of a powder selected from the group consisting of asbestine, diatomaceous earth, mica, talc and chinaclay and a binder of cellulose ether selected from the group consisting of ethyl hydroxyethyl-cellulose, methyl cellulose,hydroxyethyl methyl cellulose and methyl ethyl cellulose.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
  • Paints Or Removers (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Insulating Of Coils (AREA)
US211495A 1961-07-29 1962-07-23 Coverings of coil windings of electrical apparatus Expired - Lifetime US3245015A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB27622/61A GB1034441A (en) 1961-07-29 1961-07-29 Improvements in or relating to coverings of coil windings of electrical apparatus

Publications (1)

Publication Number Publication Date
US3245015A true US3245015A (en) 1966-04-05

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ID=10262598

Family Applications (1)

Application Number Title Priority Date Filing Date
US211495A Expired - Lifetime US3245015A (en) 1961-07-29 1962-07-23 Coverings of coil windings of electrical apparatus

Country Status (4)

Country Link
US (1) US3245015A (de)
DE (1) DE1295083B (de)
ES (1) ES279534A1 (de)
GB (1) GB1034441A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4008368A (en) * 1968-05-11 1977-02-15 Kabel-Und Metallwerke Gutehoffnungshutte Aktiengesellschaft Electrical conductor having inhibited polymer compositions
US5604693A (en) * 1995-08-16 1997-02-18 Micron Technology, Inc. On-chip program voltage generator for antifuse repair
EP1376830A3 (de) * 2002-06-21 2006-07-05 Harmonic Drive Systems Inc. Verfahren zur Herstellung einer konzentrierten Statorwicklung

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0687637B2 (ja) * 1985-02-05 1994-11-02 三菱電機株式会社 フィ−ルドコイル
DE4344044A1 (de) * 1993-12-23 1995-06-29 Abb Research Ltd Elektrisches Isoliermaterial und Verfahren zur Herstellung eines elektrisch isolierten Leiters

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2210704A (en) * 1939-05-06 1940-08-06 Westinghouse Electric & Mfg Co Insulating material
US2411284A (en) * 1943-06-29 1946-11-19 American Anode Inc Nondeteriorating rubber insulated wire
US2526483A (en) * 1949-04-26 1950-10-17 Whitney Blake Co Method of minimizing adhesion between rubber insulation layers of electric conductors and the resultant article
US2718544A (en) * 1950-09-09 1955-09-20 Gen Electric Jacketed multiple conductor cable
US2795640A (en) * 1956-02-01 1957-06-11 Gen Electric Electrical cable subject to irradiation
US3013109A (en) * 1961-03-16 1961-12-12 Anaconda Wire & Cable Co Electric cable
US3134845A (en) * 1961-02-13 1964-05-26 Gen Cable Corp Telephone drop wire

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB670548A (en) * 1948-10-28 1952-04-23 Westinghouse Electric Int Co Improvements in or relating to a method of insulating electrical coils

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2210704A (en) * 1939-05-06 1940-08-06 Westinghouse Electric & Mfg Co Insulating material
US2411284A (en) * 1943-06-29 1946-11-19 American Anode Inc Nondeteriorating rubber insulated wire
US2526483A (en) * 1949-04-26 1950-10-17 Whitney Blake Co Method of minimizing adhesion between rubber insulation layers of electric conductors and the resultant article
US2718544A (en) * 1950-09-09 1955-09-20 Gen Electric Jacketed multiple conductor cable
US2795640A (en) * 1956-02-01 1957-06-11 Gen Electric Electrical cable subject to irradiation
US3134845A (en) * 1961-02-13 1964-05-26 Gen Cable Corp Telephone drop wire
US3013109A (en) * 1961-03-16 1961-12-12 Anaconda Wire & Cable Co Electric cable

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4008368A (en) * 1968-05-11 1977-02-15 Kabel-Und Metallwerke Gutehoffnungshutte Aktiengesellschaft Electrical conductor having inhibited polymer compositions
US5604693A (en) * 1995-08-16 1997-02-18 Micron Technology, Inc. On-chip program voltage generator for antifuse repair
EP1376830A3 (de) * 2002-06-21 2006-07-05 Harmonic Drive Systems Inc. Verfahren zur Herstellung einer konzentrierten Statorwicklung

Also Published As

Publication number Publication date
DE1295083B (de) 1969-05-14
ES279534A1 (es) 1963-01-16
GB1034441A (en) 1966-06-29

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