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US3891955A - Electrical inductive apparatus - Google Patents

Electrical inductive apparatus Download PDF

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Publication number
US3891955A
US3891955A US467756A US46775674A US3891955A US 3891955 A US3891955 A US 3891955A US 467756 A US467756 A US 467756A US 46775674 A US46775674 A US 46775674A US 3891955 A US3891955 A US 3891955A
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United States
Prior art keywords
conductors
coil
foil
winding
foil conductors
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Expired - Lifetime
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US467756A
Inventor
Iii William E Horton
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ABB Inc USA
Original Assignee
Westinghouse Electric Corp
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Filing date
Publication date
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US467756A priority Critical patent/US3891955A/en
Priority to CA225,356A priority patent/CA1038464A/en
Application granted granted Critical
Publication of US3891955A publication Critical patent/US3891955A/en
Assigned to ABB POWER T&D COMPANY, INC., A DE CORP. reassignment ABB POWER T&D COMPANY, INC., A DE CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WESTINGHOUSE ELECTRIC CORPORATION, A CORP. OF PA.
Anticipated expiration legal-status Critical
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    • 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
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306—Fastening or mounting coils or windings on core, casing or other support

Definitions

  • ABSTRACT Core and coil assembly for distribution transformers. At least a portion of the coil is constructed of a plurality of metallic foil conductors which are bonded to a common piece of insulating material. The foil conductors are disposed in the coil to form coil sections which are axially displaced from each other. The insulating material extends between the coil sections to prevent relative movement of adjacent coil sections. Each foil conductor is first bonded to the insulating material and then spirally wrapped to provide the coil structure. In one embodiment, an insulating collar is positioned between adjacent foil conductors for extra mechanical strength.
  • FIGS. 1 A first figure.
  • FIG. 5 is a diagrammatic representation of FIG. 5.
  • Winding arrangements used according to the prior art wherein multiple foil conductors are used in each layer are susceptible to destruction under short-circuit stresses. Under such conditions, the foil conductors tend to move to the center of the winding structure. Thus, the foil conductors at each end of the winding structure tend to move toward each other and, if moved sufficiently, or if adjacent conductors come into contact with each other, the winding structure is damaged. Therefore, it is desirable, and it is an object of this invention, to provide a transformer having a winding structure formed from a plurality of foil conductors which are suitably disposed within the winding structure to prevent axial movement thereof, and to provide a transformer winding structure which may be econom ically constructed to exhibit these desired characteristics.
  • insulating collars having substantially the same thickness as the foil conductors are positioned between adjacent foil conductors and bonded to the insulating material. This provides a solid insulating material located between the conductors and enhances the me chanical strength of the winding structure.
  • FIG. I is a cut-away view of a distribution transformer constructed according to this invention.
  • FIG. 2 is a cut-away view of the core and coil assembly shown in FIG. 1 and constructed according to this invention
  • FIG. 3 is a view of the foil conductor arrangement used in the core and coil assembly shown in FIG. 2;
  • FIG. 4 is a partial, sectional view of the core and coil assembly shown in FIG. 2;
  • FIG. 5 is a partial, enlarged view of the structure shown in FIG. 4 and constructed according to one embodiment of this invention.
  • FIG. 6 is a partial, enlarged view of the structure shown generally in FIG. 4, but constructed according to another embodiment of this invention.
  • the transformer includes the tank 10, the cooling radiators l2, and the tank cover 14.
  • the high-voltage bushing 16 and the high-voltage lightning arrester 18 are mounted on the tank cover 14 and the tank 10, respectively.
  • the spintop type low-voltage bushing 20 and the low-voltage lightning arrester 22 are mounted on the side of the tank 10.
  • the core and coil assembly 24 is located within the transformer tank 10 and is usually surrounded by a suitable cooling dielectric, such as mineral oil.
  • the core and coil assembly 24 includes the winding structure 26 and the magnetic core structure 28.
  • the leads 29 extend from the winding structure 26 and are connected to the appropriate bushings, such as the bushings l6 and 20.
  • FIG. 2 is a cut-away view of the core and coil assembly shown in FIG. 1.
  • the winding structure 26 is disposed in inductive relationship with the wound magnetic core 28 which consists of the core portions 30 and 32.
  • the winding structure 26 includes the inner lowvoltage winding section 34, the high-voltage winding section 35, and the outer low-voltage winding section 36.
  • Each section includes at least one conductor which is spirally positioned around the center portion of the magnetic core 28.
  • the high-voltage winding section 35 may be constructed from foil conductors or from strap conductors.
  • the layer 38 of insulating material is illustrated in a position which exposes the foil conductors 40 of the outer low-voltage winding section 36.
  • FIG. 3 is a view illustrating the location of the foil conductors 40 on the insulating sheet 42 of the outer low-voltage winding section 36.
  • the inner low-voltage winding section 34 is constructed of similarly positioned insulating and conducting members.
  • the insu lating sheet 42 is constructed of a suitable material, such as kraft paper, and has a sufficient thickness to provide the desired dielectric strength between adjacent turns of the foil conductors 40.
  • the foil or sheet conductors 40 are separated by the space 44 to prevent electrical conduction between axially adjacent foil conductors. ln addition, spaces 45 are provided by the extension of the insulating sheet 42 beyond the outer edges of the outside foil conductors 40.
  • H6. 4 is a partial, sectional view of the core and coil assembly 24 shown in FIG. 2.
  • the foil conductors 40 illustrated in FIG. 4 represent conductors contained within the low-voltage winding section 34.
  • the conductors 40 are separated from the magnetic core 28 by the additional insulating material 46.
  • the foil conductors 40 positioned between the insulating sheets 48 and 50 provide one conducting layer of the inner low-voltage winding section 34. Additional conducting layers are provided by spirally wrapping the insulating sheet and the foil conductors 40 around the magnetic core 28.
  • the winding section formed thereby is essentially a three-section, foil-wound winding. Other numbers of sections may be used within the contemplation of this invention.
  • a single sheet of insulating material such as the insulating sheets 48 and 50, having a width substantially equal to the axial dimension of the winding structure provides sufficient mechanical support between the coil sections to prevent damaging movement of the conductors when they are subjected to high stress conditions.
  • FIG. is an enlarged, partial view of a foil conductor 40 attached to an insulating sheet 52.
  • An adhesive material 54 is located between the conductor 40 and the sheet 52 to provide the desired bonding characteristics.
  • the foil conductors 40 are first bonded to the insulating sheet 52 by a suitable method and then the composite material consisting of the insulating sheet 52 and the foil conductors 40 bonded thereto are wrapped around a suitable axis to provide a spirally disposed winding structure.
  • FIG. 6 is a view illustrating an arrangement constructed according to another embodiment of the invention.
  • An insulating collar 56 is positioned between the foil conductors 40 and is similarly bonded to the insulating sheet 58 by the adhesive 60.
  • the insulating collar provides additional reinforcement of the foil conductors 40 and prevents relative movement therebetween.
  • the insulating collar 56 may be constructed of any suitable material. such as kraft paper. In the embodiment shown, the thickness of the insulating collar 56 is substantially equal to the thickness of the conductors 40.
  • the unique conductor arrangement and construction of the winding disclosed herein permits relatively easy construction of a foil-wound transformer.
  • the foil conductors are bonded in the proper positions on the insulating sheet and then the entire conductor-insulationadhesive structure is spirally wound to form the winding.
  • a magnetic core is then placed into the winding. Since the conductors are fixed with respect to each other, the axial position of each conductor need not be controlled separately during the winding process. For example, in a three-section winding, at least three axial alignments are required during construction of the winding according to the prior art compared to only one axial alignment when constructed according to this invention.
  • the insulating and conducting materials together permits the construction of a transformer which has less insulating material than prior art transformers, even with only one conductor.
  • the insulating material must have a greater thickness than that required for sufficient electrical strength in order to provide sufficient mechanical strength during the winding process. Due to the increased strength of the bonded insulating and conducting materials, the thickness of the insulating material may be just sufficient to provide the desired electrical properties without causing difficulty due to tearing during the winding operation.
  • a transformer comprising:
  • a secondary winding having a plurality of conducting layers disposed in inductive relationship with the magnetic core, with each of said conducting layers comprising at least two metallic foil conductors which are bonded to a common layer of insulating material;
  • an insulating member positioned between the foil conductors, with said insulating member having substantially the same radial thickness as the foil conductors.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Insulating Of Coils (AREA)

Abstract

Core and coil assembly for distribution transformers. At least a portion of the coil is constructed of a plurality of metallic foil conductors which are bonded to a common piece of insulating material. The foil conductors are disposed in the coil to form coil sections which are axially displaced from each other. The insulating material extends between the coil sections to prevent relative movement of adjacent coil sections. Each foil conductor is first bonded to the insulating material and then spirally wrapped to provide the coil structure. In one embodiment, an insulating collar is positioned between adjacent foil conductors for extra mechanical strength.

Description

United States Patent 1 1 Horton, III
1 ELECTRICAL lNDUCTlVE APPARATUS {75} Inventor: William E. Horton, ll], Bogart, Ga.
[73] Assignee: Westinghouse Electric Corporation,
Pittsburgh, Pa.
[22] Filed: May 7, 1974 [21] App]. No.: 467,756
1 1 June 24, 1975 United Kingdom 336/206 Austria 336/206 [57] ABSTRACT Core and coil assembly for distribution transformers. At least a portion of the coil is constructed of a plurality of metallic foil conductors which are bonded to a common piece of insulating material. The foil conductors are disposed in the coil to form coil sections which are axially displaced from each other. The insulating material extends between the coil sections to prevent relative movement of adjacent coil sections. Each foil conductor is first bonded to the insulating material and then spirally wrapped to provide the coil structure. In one embodiment, an insulating collar is positioned between adjacent foil conductors for extra mechanical strength.
1 Claim, 6 Drawing Figures PATENTEnJuM24 ms 3,891. 955 SHEET 1 \i Nil Nil FIG.|.
PATENTEDJUN 24 I975 SHEET FIG.2.
FIG. 3.
FIGS.
FIG. 5.
ELECTRICAL INDUCTIVE APPARATUS BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates, in general, to electrical inductive apparatus and, more specifically, to distribution transformers having foil conductors.
2. Description of the Prior Art Distribution transformers which operate at relatively high voltages have coil structures which are suitable for construction from foil conductors. The physical integrity of a coil structure constructed with foil conductors has been found to be better than a corresponding winding structure constructed from strap conductors. This is due mainly to the fact that thin sheet or foil conductors can be supported over a larger surface area than relatively thick strap conductors. Thus, the ability of a transformer to withstand short-circuit stresses is enhanced by the use of foil conductors.
In some high-voltage winding structures, the use of a single sheet of foil which has a width substantially equal to the axial length of the winding structure, is practical. Such transformers exhibit very good mechanical integrity. However, as the voltage between layers increases, the insulation between the layers must be increased sufficiently to provide the required dielectric properties. As a result thereof, the space factor of the winding structure becomes undesirable when a single foil conductor is used. Using several foil conductors to form separate coil sections permits a reduction in insulating material and an improvement in the space factor. Windings and materials constructed in this manner are disclosed in US Pat. Nos. 217,466 to J. L. be Conte, 2,980,874 to J. W. Tarbox, and 3,477,126 to H. K. Price.
Winding arrangements used according to the prior art wherein multiple foil conductors are used in each layer are susceptible to destruction under short-circuit stresses. Under such conditions, the foil conductors tend to move to the center of the winding structure. Thus, the foil conductors at each end of the winding structure tend to move toward each other and, if moved sufficiently, or if adjacent conductors come into contact with each other, the winding structure is damaged. Therefore, it is desirable, and it is an object of this invention, to provide a transformer having a winding structure formed from a plurality of foil conductors which are suitably disposed within the winding structure to prevent axial movement thereof, and to provide a transformer winding structure which may be econom ically constructed to exhibit these desired characteristics.
SUMMARY OF THE INVENTION There are disclosed herein new and useful arrangements for constructing the winding structure of a distribution transformer. A plurality of foil conductors are bonded to a single sheet of insulating material. The insulating and conducting members are spirally wound around each other to form the desired winding structure. By bonding the conducting foils to the insulating material, the construction of the winding is considerably simplified over construction techniques which require separate winding of each section of the winding. In addition. bonding the conductors to the insulating material prevents movement of the conductors during short-circuit stresses. In one embodiment of the invention, insulating collars having substantially the same thickness as the foil conductors are positioned between adjacent foil conductors and bonded to the insulating material. This provides a solid insulating material located between the conductors and enhances the me chanical strength of the winding structure.
BRIEF DESCRIPTION OF THE DRAWING Other advantages and uses of this invention will become more apparent when considered in view of the following detailed description and drawing, in which:
FIG. I is a cut-away view of a distribution transformer constructed according to this invention;
FIG. 2 is a cut-away view of the core and coil assembly shown in FIG. 1 and constructed according to this invention;
FIG. 3 is a view of the foil conductor arrangement used in the core and coil assembly shown in FIG. 2;
FIG. 4 is a partial, sectional view of the core and coil assembly shown in FIG. 2;
FIG. 5 is a partial, enlarged view of the structure shown in FIG. 4 and constructed according to one embodiment of this invention; and,
FIG. 6 is a partial, enlarged view of the structure shown generally in FIG. 4, but constructed according to another embodiment of this invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS Throughout the following description, similar reference characters refer to similar elements or members in all of the figures of the drawing.
Referring now to the drawing, and to FIG. I in particular, there is shown a distribution transformer constructed according to this invention. The transformer includes the tank 10, the cooling radiators l2, and the tank cover 14. The high-voltage bushing 16 and the high-voltage lightning arrester 18 are mounted on the tank cover 14 and the tank 10, respectively. The spintop type low-voltage bushing 20 and the low-voltage lightning arrester 22 are mounted on the side of the tank 10. The core and coil assembly 24 is located within the transformer tank 10 and is usually surrounded by a suitable cooling dielectric, such as mineral oil. The core and coil assembly 24 includes the winding structure 26 and the magnetic core structure 28. The leads 29 extend from the winding structure 26 and are connected to the appropriate bushings, such as the bushings l6 and 20.
FIG. 2 is a cut-away view of the core and coil assembly shown in FIG. 1. The winding structure 26 is disposed in inductive relationship with the wound magnetic core 28 which consists of the core portions 30 and 32. The winding structure 26 includes the inner lowvoltage winding section 34, the high-voltage winding section 35, and the outer low-voltage winding section 36. Each section includes at least one conductor which is spirally positioned around the center portion of the magnetic core 28. The high-voltage winding section 35 may be constructed from foil conductors or from strap conductors. The layer 38 of insulating material is illustrated in a position which exposes the foil conductors 40 of the outer low-voltage winding section 36.
FIG. 3 is a view illustrating the location of the foil conductors 40 on the insulating sheet 42 of the outer low-voltage winding section 36. The inner low-voltage winding section 34 is constructed of similarly positioned insulating and conducting members. The insu lating sheet 42 is constructed of a suitable material, such as kraft paper, and has a sufficient thickness to provide the desired dielectric strength between adjacent turns of the foil conductors 40. The foil or sheet conductors 40 are separated by the space 44 to prevent electrical conduction between axially adjacent foil conductors. ln addition, spaces 45 are provided by the extension of the insulating sheet 42 beyond the outer edges of the outside foil conductors 40.
H6. 4 is a partial, sectional view of the core and coil assembly 24 shown in FIG. 2. The foil conductors 40 illustrated in FIG. 4 represent conductors contained within the low-voltage winding section 34. The conductors 40 are separated from the magnetic core 28 by the additional insulating material 46. The foil conductors 40 positioned between the insulating sheets 48 and 50 provide one conducting layer of the inner low-voltage winding section 34. Additional conducting layers are provided by spirally wrapping the insulating sheet and the foil conductors 40 around the magnetic core 28. The winding section formed thereby is essentially a three-section, foil-wound winding. Other numbers of sections may be used within the contemplation of this invention. The use of a single sheet of insulating material, such as the insulating sheets 48 and 50, having a width substantially equal to the axial dimension of the winding structure provides sufficient mechanical support between the coil sections to prevent damaging movement of the conductors when they are subjected to high stress conditions.
FIG. is an enlarged, partial view of a foil conductor 40 attached to an insulating sheet 52. An adhesive material 54 is located between the conductor 40 and the sheet 52 to provide the desired bonding characteristics. The foil conductors 40 are first bonded to the insulating sheet 52 by a suitable method and then the composite material consisting of the insulating sheet 52 and the foil conductors 40 bonded thereto are wrapped around a suitable axis to provide a spirally disposed winding structure.
FIG. 6 is a view illustrating an arrangement constructed according to another embodiment of the invention. An insulating collar 56 is positioned between the foil conductors 40 and is similarly bonded to the insulating sheet 58 by the adhesive 60. The insulating collar provides additional reinforcement of the foil conductors 40 and prevents relative movement therebetween. The insulating collar 56 may be constructed of any suitable material. such as kraft paper. In the embodiment shown, the thickness of the insulating collar 56 is substantially equal to the thickness of the conductors 40.
The unique conductor arrangement and construction of the winding disclosed herein permits relatively easy construction of a foil-wound transformer. The foil conductors are bonded in the proper positions on the insulating sheet and then the entire conductor-insulationadhesive structure is spirally wound to form the winding. A magnetic core is then placed into the winding. Since the conductors are fixed with respect to each other, the axial position of each conductor need not be controlled separately during the winding process. For example, in a three-section winding, at least three axial alignments are required during construction of the winding according to the prior art compared to only one axial alignment when constructed according to this invention.
in addition, bonding the insulating and conducting materials together permits the construction of a transformer which has less insulating material than prior art transformers, even with only one conductor. With normal winding techniques, the insulating material must have a greater thickness than that required for sufficient electrical strength in order to provide sufficient mechanical strength during the winding process. Due to the increased strength of the bonded insulating and conducting materials, the thickness of the insulating material may be just sufficient to provide the desired electrical properties without causing difficulty due to tearing during the winding operation.
Since numerous changes may be made in the above described apparatus, and since different embodiments of the invention may be made without departing from the spirit thereof, it is intended that all of the matter contained in the foregoing description, or shown in the accompanying drawing, shall be interpreted as illustrative rather than limiting.
I claim as my invention:
1. A transformer comprising:
a magnetic core;
a primary winding disposed in inductive relationship with said magnetic core;
a secondary winding having a plurality of conducting layers disposed in inductive relationship with the magnetic core, with each of said conducting layers comprising at least two metallic foil conductors which are bonded to a common layer of insulating material; and,
an insulating member positioned between the foil conductors, with said insulating member having substantially the same radial thickness as the foil conductors.

Claims (1)

1. A transformer comprising: a magnetic core; a primary winding disposed in inductive relationship with said magnetic core; a secondary winding having a plurality of conducting layers disposed in inductive relationship with the magnetic core, with each of said conducting layers comprising at least two metallic foil conductors which are bonded to a common layer of insulating material; and, an insulating member positioned between the foil conductors, with said insulating member having substantially the same radial thickness as the foil conductors.
US467756A 1974-05-07 1974-05-07 Electrical inductive apparatus Expired - Lifetime US3891955A (en)

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CA225,356A CA1038464A (en) 1974-05-07 1975-04-24 Transformer with foil conductors

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Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4160224A (en) * 1977-05-11 1979-07-03 Owen D W Transformer
US4249229A (en) * 1978-08-28 1981-02-03 Litton Systems, Inc. Transformer having novel multiple winding and support structure and method of making same
US4255734A (en) * 1978-04-03 1981-03-10 Owen D W Transformer with tapped subwindings
US4368407A (en) * 1979-08-31 1983-01-11 Frequency Technology, Inc. Inductor-capacitor impedance devices and method of making the same
USRE31704E (en) * 1978-08-28 1984-10-09 Litton Systems, Inc. Transformer having novel multiple winding and support structure and method of making same
US4524341A (en) * 1983-02-07 1985-06-18 Owen D W Transformer with series-parallel-series winding between split winding
US4692566A (en) * 1984-07-24 1987-09-08 Phelps Dodge Industries, Inc. Ribbon cable
US4748293A (en) * 1985-02-25 1988-05-31 Oki Electric Industry Co., Ltd. Flexible cable and method of manufacturing thereof
US5005100A (en) * 1989-08-02 1991-04-02 Southwest Electric Company Transient-filtered transformer
US5130616A (en) * 1990-11-13 1992-07-14 Southwest Electric Company Motor control system and components thereof
US5216356A (en) * 1990-11-13 1993-06-01 Southwest Electric Company Shielded three phase transformer with tertiary winding
WO1993019476A1 (en) * 1992-03-25 1993-09-30 Electric Power Research Institute, Inc. Improved core-form transformer
US5449991A (en) * 1993-09-20 1995-09-12 Southwest Electric Company Motor control system and apparatus for providing desired three-phase voltage therein using a main transformer energized through an autotransformer
WO1997000527A1 (en) * 1995-06-19 1997-01-03 Thomson Consumer Electronics, Inc. Transformer
US5895026A (en) * 1996-03-06 1999-04-20 Kelsey-Hayes Company Foil wound coil for a solenoid valve
US6138343A (en) * 1997-08-04 2000-10-31 Abb Power T&D Company Inc. Method for manufacturing a variable insulated helically wound electrical coil
US6492892B1 (en) 1998-04-03 2002-12-10 Abb Inc. Magnet wire having differential build insulation
US20070132532A1 (en) * 2004-04-01 2007-06-14 Abb Technology Ag Winding for a transformer or a coil and method for the production thereof
US20080186122A1 (en) * 2007-02-07 2008-08-07 Zhe Jiang University Integrated structure of passive elements in LLC resonance converter realized by flexible circuit boards
US20100109830A1 (en) * 2007-02-07 2010-05-06 Hanser Volker W Transformer
FR2951519A1 (en) * 2009-10-15 2011-04-22 Bosch Gmbh Robert ELECTROMAGNETIC VALVE, FUEL INJECTOR AND METHOD OF MANUFACTURE
CN102163491A (en) * 2010-12-27 2011-08-24 华为技术有限公司 Flexible winding and inductor integrated with capacitor characteristic and manufacturing method of flexible winding
WO2014025643A1 (en) * 2012-08-06 2014-02-13 The Trustees Of Dartmouth College Systems and methods for promoting low loss in parallel conductors at high frequencies
FR3033198A1 (en) * 2015-02-26 2016-09-02 Nexans SYSTEM FOR MONITORING A HIGH VOLTAGE LINE WITH CONTINUOUS CURRENT
US9472334B2 (en) 2014-06-19 2016-10-18 Efore Oyj Transformer
CN109494057A (en) * 2017-09-12 2019-03-19 瑞凯知识产权发展有限公司 Inductor assembly
WO2022098245A1 (en) * 2020-11-04 2022-05-12 Seid As High-voltage transformer and generation circuit for a plasma-based gas-treatment apparatus
US20230215609A1 (en) * 2020-11-06 2023-07-06 Hitachi Energy Switzerland Ag Cross reference to related applications

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US901299A (en) * 1907-02-11 1908-10-13 Isidor Kitsee Method of producing electric coils and conductors therefor.
US2980874A (en) * 1957-09-16 1961-04-18 John W Tarbox Electric winding
US3102245A (en) * 1959-08-03 1963-08-27 Caledonia Electronics And Tran Electrical transformer
US3560904A (en) * 1968-04-19 1971-02-02 Rolamite Technology Inc Electric coils

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US901299A (en) * 1907-02-11 1908-10-13 Isidor Kitsee Method of producing electric coils and conductors therefor.
US2980874A (en) * 1957-09-16 1961-04-18 John W Tarbox Electric winding
US3102245A (en) * 1959-08-03 1963-08-27 Caledonia Electronics And Tran Electrical transformer
US3560904A (en) * 1968-04-19 1971-02-02 Rolamite Technology Inc Electric coils

Cited By (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4160224A (en) * 1977-05-11 1979-07-03 Owen D W Transformer
US4255734A (en) * 1978-04-03 1981-03-10 Owen D W Transformer with tapped subwindings
US4249229A (en) * 1978-08-28 1981-02-03 Litton Systems, Inc. Transformer having novel multiple winding and support structure and method of making same
USRE31704E (en) * 1978-08-28 1984-10-09 Litton Systems, Inc. Transformer having novel multiple winding and support structure and method of making same
US4368407A (en) * 1979-08-31 1983-01-11 Frequency Technology, Inc. Inductor-capacitor impedance devices and method of making the same
US4524341A (en) * 1983-02-07 1985-06-18 Owen D W Transformer with series-parallel-series winding between split winding
US4692566A (en) * 1984-07-24 1987-09-08 Phelps Dodge Industries, Inc. Ribbon cable
US4748293A (en) * 1985-02-25 1988-05-31 Oki Electric Industry Co., Ltd. Flexible cable and method of manufacturing thereof
US5005100A (en) * 1989-08-02 1991-04-02 Southwest Electric Company Transient-filtered transformer
US5130616A (en) * 1990-11-13 1992-07-14 Southwest Electric Company Motor control system and components thereof
US5216356A (en) * 1990-11-13 1993-06-01 Southwest Electric Company Shielded three phase transformer with tertiary winding
US5322971A (en) * 1990-11-13 1994-06-21 Southwest Electric Company Motor control system and components thereof
WO1993019476A1 (en) * 1992-03-25 1993-09-30 Electric Power Research Institute, Inc. Improved core-form transformer
US5508674A (en) * 1992-03-25 1996-04-16 Electric Power Research Institute, Inc. Core-form transformer
US5449991A (en) * 1993-09-20 1995-09-12 Southwest Electric Company Motor control system and apparatus for providing desired three-phase voltage therein using a main transformer energized through an autotransformer
WO1997000527A1 (en) * 1995-06-19 1997-01-03 Thomson Consumer Electronics, Inc. Transformer
US5895026A (en) * 1996-03-06 1999-04-20 Kelsey-Hayes Company Foil wound coil for a solenoid valve
US6138343A (en) * 1997-08-04 2000-10-31 Abb Power T&D Company Inc. Method for manufacturing a variable insulated helically wound electrical coil
US6492892B1 (en) 1998-04-03 2002-12-10 Abb Inc. Magnet wire having differential build insulation
US7477126B2 (en) * 2004-04-01 2009-01-13 Abb Technology Ag Winding for a transformer or a coil and method for the production thereof
US20070132532A1 (en) * 2004-04-01 2007-06-14 Abb Technology Ag Winding for a transformer or a coil and method for the production thereof
CN101051549B (en) * 2007-02-07 2011-05-04 浙江大学 Passive element integrated structure in realizing LLC resonant converter for flexible circuit board
US20100109830A1 (en) * 2007-02-07 2010-05-06 Hanser Volker W Transformer
US20080186122A1 (en) * 2007-02-07 2008-08-07 Zhe Jiang University Integrated structure of passive elements in LLC resonance converter realized by flexible circuit boards
US7671713B2 (en) * 2007-02-07 2010-03-02 Zhe Jiang University Integrated structure of passive elements in LLC resonance converter realized by flexible circuit boards
FR2951519A1 (en) * 2009-10-15 2011-04-22 Bosch Gmbh Robert ELECTROMAGNETIC VALVE, FUEL INJECTOR AND METHOD OF MANUFACTURE
CN102163491A (en) * 2010-12-27 2011-08-24 华为技术有限公司 Flexible winding and inductor integrated with capacitor characteristic and manufacturing method of flexible winding
WO2014025643A1 (en) * 2012-08-06 2014-02-13 The Trustees Of Dartmouth College Systems and methods for promoting low loss in parallel conductors at high frequencies
US9472334B2 (en) 2014-06-19 2016-10-18 Efore Oyj Transformer
FR3033198A1 (en) * 2015-02-26 2016-09-02 Nexans SYSTEM FOR MONITORING A HIGH VOLTAGE LINE WITH CONTINUOUS CURRENT
CN109494057A (en) * 2017-09-12 2019-03-19 瑞凯知识产权发展有限公司 Inductor assembly
CN109494057B (en) * 2017-09-12 2024-02-13 瑞凯知识产权发展有限公司 Inductor assembly
WO2022098245A1 (en) * 2020-11-04 2022-05-12 Seid As High-voltage transformer and generation circuit for a plasma-based gas-treatment apparatus
US20230215609A1 (en) * 2020-11-06 2023-07-06 Hitachi Energy Switzerland Ag Cross reference to related applications
US11894183B2 (en) * 2020-11-06 2024-02-06 Hitachi Energy Ltd Winding

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