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US2866955A - Tap structure for reactive device - Google Patents

Tap structure for reactive device Download PDF

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Publication number
US2866955A
US2866955A US400874A US40087453A US2866955A US 2866955 A US2866955 A US 2866955A US 400874 A US400874 A US 400874A US 40087453 A US40087453 A US 40087453A US 2866955 A US2866955 A US 2866955A
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Prior art keywords
tap
coil
connection member
sections
bar portion
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Expired - Lifetime
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US400874A
Inventor
Robert D Mees
Charles M Marker
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General Electric Co
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General Electric Co
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Priority to US400874A priority Critical patent/US2866955A/en
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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
    • H01F27/2823—Wires
    • H01F27/2828—Construction of conductive connections, of leads

Definitions

  • This invention relates to reactive devices and more particularly to reactive devices having tapped leads connected thereto.
  • Reactive devices such as transformers, autotransfonners and reactors are frequently provided with one or more tap leads connected to the winding intermediate the ends thereof.
  • the coils of larger reactive devices are frequently formed of rectangular wire or bar stock.
  • these conductors have conventionally been copper and the necessary tap leads were merely brazed to the side or top of the conductor.
  • some conductive material other than copper for the coils such as aluminum. It has been found diflicult to secure a satisfactory brazed connection to aluminum due to galvanic corrosion. It is therefore desirable to provide an improved reactive device construction which does not require the use of brazed connections for bringing out the tap leads. It is further desirable that such a construction facilitate the winding operation and that the tap connections be substantiallyv corrosion free thus eliminating the formation of oxides and brittle joints.
  • This invention in its broadest aspects, provides a reactive device having a coil and a separate tap connection member for connecting the coil to a tap lead, the tap connection member having a substantially T-shaped configuration.
  • the coil is split into at least two sections and the ends of the bar portion of the tap connection member are respectively joined to one end of each of two of the coil sections.
  • the end of the leg portion of the tap connection member is then adapted to be connected to a tap lead, or may serve as a tap terminal itself.
  • Fig. l is a fragmentary view in perspective, partly broken away, illustrating a reactive device incorporating the improved construction of this invention
  • Fig. 2 is a fragmentary view in perspective illustrating one type of improved tap connection in accordance with this invention.
  • Fig. 3 is another fragmentary view in perspective illustrating another form of the improved tap connection of this invention.
  • a reactive device generally identified as 1, shown here as being a transformer, having a core portion 2 preferably formed of a plurality of relatively thin Iaminations of magnetic material.
  • the core 2 is surrounded by an inner coil 3, which may be the primary winding, which in turn is surrounded by an outer coil 4, which may be the secondary winding, the coils 3 and 4 being separated by conventional spacers 5.
  • the coils 3 and 4 of the reactive device 1 are formed of conductors 6 having a substantially rectangular cross section. 7 for the coils 3 and 4, an individual turn 8, as shown in Fig. 2, from which the tap lead is to be taken, is split thus dividing the coil into at least two sections.
  • a sep arate tap connection member 9 is provided having a leg.
  • tap member 9 is preferably formed of sheet material so that the bar portion 10 and the leg portion 11 thereof.- have substantially rectangular cross sections correspond ing to the cross section of the conductor 6.
  • tap connection member 9 may be fabricated from' a section of bar stock having a rectangular cross section with the leg portion being integrally joined thereto in any: suitable manner, such as helium arc welding.
  • the ends of the bar portion 19 are integrally joined to the ends 12 of the two sections of turn 8 of the coil in any suit able manner, as at 13. These connections may be made,v in the case of aluminum conductor, by resistance butt upset welding.
  • leg portion 11 of tap connection member 9 may then be similarly integrally joined to the leg portion 11 of tap connection member 9, as at 15.
  • the portion 16 of turn 8 of the coil in which the tap connection member 9 is located is off-set from the remaining portion of the; turn as at 17, so that the leg portion 11 and tap lead 14.” are spaced'from'the other conductors of the coil. Th'isf. off-set maybe sufficiently high to permit another tap 'con nection 18 to be taken from an inner turn 19.
  • a connection of this type may be used to take a tap lead fromthe top of the coil when the coil is edgewise wound, as
  • tion member 22 is provided'with the ends 23 of its bar portion integrally joined to the ends 24 of conductor 21, as. at 25.
  • the end 26 of the leg portion of tap connection member 22 may be formed at right angles to.
  • this invention provides an improved reactive device construction wherein tap leads may be brought out without the use of joints subject to corrosion and brittleness.
  • a coil formed of a conductor having a substantially rectangular cross section, and a.
  • said bar portion of said tap connection member having a substantially rec1-- tangular cross section, said coil having at least two sections, the ends of said bar portion of said tap connection member being respectively integrally joined to one end of each of two of said' coil sections, the legportion of said tap, connection member being adapted to be connected. to said tap lead.
  • a coil formed of a conductor having a substantially rectangular cross section, and a tap connection member for connecting said coil, to a tap lead, said tap. connection member having a substantially T-shaped configuration with its leg portion extending from a side edge of its bar portion, said bar portion and said leg portion of said tap connection member having a.
  • said coil having at least two sections, the ends of said bar portion of said tap connection member being respectively integrally joined to one end of each of two of said coil sections, and a tap lead having a substantially rectangular cross section integrally joined to the end of said leg portion of said tap connection member.
  • tap connection member for connecting said coil to a. tap lead
  • said tap connecting member having a substantially T-shaped'configuration with its leg portion extending, from a side edge of its bar portion, said bar portion of, said tap connection member having a substantially rectangular cross section, said coil having at least two sections, the ends of said bar portion of said tap connection member being respectively joined to one end of each of two of said coil sections, said leg portion of said tap connection member being adapted to be connected to said tap lead, said leg portion extending at an angle to the plane of said bar portion.
  • a coil formed of a, conductor having a substantially rectangular cross section, and a tap connection member for connecting said coil to a tap lead, said tap connection member having a substantially T- shaped configuration with its leg portion extending from a side edge of its bar portion, said bar portion of. said tap connection member having a substantially rectangular cross section, said coil having at least two sections,
  • a coil formed of a conductor having a substantially rectangular cross section, and a tap connection member for connecting said coil to a tap lead said tap connection member having a substantially T- shaped configuration with the leg portion extending from a side edge of its bar portion, said bar portion of said tap connection member having a substantially rectangular cross section, said coil having at least two sections, the ends of: said bar portion of said tap connection member being respectively integrally joined to one end of. each of two of said coil sections, said leg portion of said tap connection member being adapted to be connected to said tap lead, said ends of said coil sections to which said tap connection member is joined being otf-set from the remainder of said coil sections, said leg portion of said connection member extending over said coil and being spaced therefrom.
  • a coil formed of a conductor having a substantially rectangular cross section, a tap connection member for connecting saidv coil to a tap lead, said tap connection member having a substantially T-sha-ped configuration with its leg portion extending from itsside edge of its bar portion, said bar portion and;
  • said coil having at, least two. sections, the ends of said bar portion of said. tapv connection member being respectively integrally joined tov one end of each of two of said coil sections, the legv portion of said tap. connection member extending; at right angles. to the plane of said bar portion, and a tap, lead having a substantially rectangular cross section integrally joined to the end of said leg. portion ofv said tap connection member.
  • a coil formed ofa conductor having a substantially rectangular cross section, a tap connection, member for connecting said coil to a tap lead said: tap connection member having a substantially T- shaped configuration with its leg portion extending from its side edge of its bar portion, said bar portion and said leg portion of said tap connection member havinga sub.- stantially rectangular cross section, said coil having; at least two sections, the ends of said bar portion of said tap connection member being respectively integrally joined toone end of each of two, of saidcoil sections, and a tap lead having asubstantially rectangular cross section integrally joined to the end of said leg portion of said tap connection member, said endof said coil sections to which said, tap connection member is joined being oft-set from the remainder of said coil sections, said tap-lead extending over said coil and being spaced therefrom.

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

Description

Dec. 30, 1958 R. D. MEES HAL TAP STRUCTURE FOR REACTIVE DEVICE Filed De c. 29, 1953 2,866,955 TAP STRUCTURE FOR REACTIVE DEVICE Robert D. Mees, Fort Wayne, Ind., and Charles M.
Marker, Schenectady, N. Y., assignors to General Electric Company, a corporation of New York Application December 29, 1953, Serial No. 400,874 7 Claims. (Cl. 336192) This invention relates to reactive devices and more particularly to reactive devices having tapped leads connected thereto. 1
Reactive devices, such as transformers, autotransfonners and reactors are frequently provided with one or more tap leads connected to the winding intermediate the ends thereof. The coils of larger reactive devices are frequently formed of rectangular wire or bar stock. In the past, these conductors have conventionally been copper and the necessary tap leads were merely brazed to the side or top of the conductor. It may be desirable however, to utilize some conductive material other than copper for the coils, such as aluminum. It has been found diflicult to secure a satisfactory brazed connection to aluminum due to galvanic corrosion. It is therefore desirable to provide an improved reactive device construction which does not require the use of brazed connections for bringing out the tap leads. It is further desirable that such a construction facilitate the winding operation and that the tap connections be substantiallyv corrosion free thus eliminating the formation of oxides and brittle joints.
It is therefore an object of this invention to provide an improved-reactive device incorporating the desirable features set forth above.
Further objects and advantages of this invention will become apparent by reference to the following description and the accompanying drawing, and the features of novelty which characterize this invention will be pointed out with particularity in the claims annexed to and form ing a part of this specification.
This invention, in its broadest aspects, provides a reactive device having a coil and a separate tap connection member for connecting the coil to a tap lead, the tap connection member having a substantially T-shaped configuration. The coil is split into at least two sections and the ends of the bar portion of the tap connection member are respectively joined to one end of each of two of the coil sections. The end of the leg portion of the tap connection member is then adapted to be connected to a tap lead, or may serve as a tap terminal itself.
In the drawing, Fig. l is a fragmentary view in perspective, partly broken away, illustrating a reactive device incorporating the improved construction of this invention;
Fig. 2 is a fragmentary view in perspective illustrating one type of improved tap connection in accordance with this invention; and
Fig. 3 is another fragmentary view in perspective illustrating another form of the improved tap connection of this invention.
Referring now to Fig. 1, there is shown a reactive device, generally identified as 1, shown here as being a transformer, having a core portion 2 preferably formed of a plurality of relatively thin Iaminations of magnetic material. The core 2 is surrounded by an inner coil 3, which may be the primary winding, which in turn is surrounded by an outer coil 4, which may be the secondary winding, the coils 3 and 4 being separated by conventional spacers 5.
Referring now to Figs. 2 and 3 in addition to Fig. 1, it is seen that the coils 3 and 4 of the reactive device 1 are formed of conductors 6 having a substantially rectangular cross section. 7 for the coils 3 and 4, an individual turn 8, as shown in Fig. 2, from which the tap lead is to be taken, is split thus dividing the coil into at least two sections. A sep arate tap connection member 9 is provided having a leg.
portion 11 extending from a side edge of bar portion 10. The tap member 9 is preferably formed of sheet material so that the bar portion 10 and the leg portion 11 thereof.- have substantially rectangular cross sections correspond ing to the cross section of the conductor 6. In the alternative, tap connection member 9 may be fabricated from' a section of bar stock having a rectangular cross section with the leg portion being integrally joined thereto in any: suitable manner, such as helium arc welding. The ends of the bar portion 19 are integrally joined to the ends 12 of the two sections of turn 8 of the coil in any suit able manner, as at 13. These connections may be made,v in the case of aluminum conductor, by resistance butt upset welding. In accordance with this welding tech nique, current is passed through the joint and the resistance of the butt joint heats the adjacent areas to the desired welding temperature. Pressure is continuously applied by the welding apparatus so that the ends are. forged together. Tap lead 14, also having a substantially, rectangular cross section preferably corresponding to.
the cross section of leg portion 11 of tap connection member 9, may then be similarly integrally joined to the leg portion 11 of tap connection member 9, as at 15.
It willbe seen in Fig. 2 that the portion 16 of turn 8 of the coil in which the tap connection member 9 is located is off-set from the remaining portion of the; turn as at 17, so that the leg portion 11 and tap lead 14." are spaced'from'the other conductors of the coil. Th'isf. off-set maybe sufficiently high to permit another tap 'con nection 18 to be taken from an inner turn 19. A connection of this type may be used to take a tap lead fromthe top of the coil when the coil is edgewise wound, as
shown at 20 in Fig. 1 or, in the event that the coil is flat Wound, to take a tap lead from the side of the coil.
Referring now to Fig. 3, the particular turn 21'from which the tap lead is to be taken is again split to form two coil sections and substantially T-shaped tap connec: tion member 22 is provided'with the ends 23 of its bar portion integrally joined to the ends 24 of conductor 21, as. at 25. Here, the end 26 of the leg portion of tap connection member 22 may be formed at right angles to.
the plane, of conductor 21 so that the tap lead 28, which is integrally joined to end 25 of tap connection 22 as at 29, is parallel to the side of the coil. Such a c'onnectiori may be used in an edgewise wound coil, as shown at 30 in Fig. l to take a tap connection from a side of the coil. It will -be obvious that this construction may also be used for making inter coil connections, as at 31 in Fig. 1. It will also be obvious that the leg portions 11 and 26 of the tap connection may be formed as terminals for direct connection of external leads instead of having the tap leads l4 and 28 integrally joined thereto.
It will now be readily apparent that this invention provides an improved reactive device construction wherein tap leads may be brought out without the use of joints subject to corrosion and brittleness.
While we have shown and described particular embodiments of this invention, further modifications and im:
. provements will occur to those skilled in the art and we In order to provide tap connections.
What we claim as new and desire to secure by Letters Patent of the United States is:
1. In a reactive device, a coil formed of a conductor having a substantially rectangular cross section, and a.
from a side edge of its bar portion, said bar portion of said tap connection member having a substantially rec1-- tangular cross section, said coil having at least two sections, the ends of said bar portion of said tap connection member being respectively integrally joined to one end of each of two of said' coil sections, the legportion of said tap, connection member being adapted to be connected. to said tap lead.
2. In a reactive device, a coil formed of a conductor having a substantially rectangular cross section, and a tap connection member for connecting said coil, to a tap lead, said tap. connection member having a substantially T-shaped configuration with its leg portion extending from a side edge of its bar portion, said bar portion and said leg portion of said tap connection member having a.
substantially rectangular cross section, said coil having at least two sections, the ends of said bar portion of said tap connection member being respectively integrally joined to one end of each of two of said coil sections, and a tap lead having a substantially rectangular cross section integrally joined to the end of said leg portion of said tap connection member.
3'. In a reactive device, a coil formed of a conductor having a substantially rectangular cross section, and. a.
tap connection member for connecting said coil to a. tap lead, said tap connecting member having a substantially T-shaped'configuration with its leg portion extending, from a side edge of its bar portion, said bar portion of, said tap connection member having a substantially rectangular cross section, said coil having at least two sections, the ends of said bar portion of said tap connection member being respectively joined to one end of each of two of said coil sections, said leg portion of said tap connection member being adapted to be connected to said tap lead, said leg portion extending at an angle to the plane of said bar portion.
4. In a reactive device, a coil formed of a, conductor having a substantially rectangular cross section, and a tap connection member for connecting said coil to a tap lead, said tap connection member having a substantially T- shaped configuration with its leg portion extending from a side edge of its bar portion, said bar portion of. said tap connection member having a substantially rectangular cross section, said coil having at least two sections,
the ends of said bar portion of said tap connectionmemher being respectively integrally joined to one end of each of two of said coil sections, said leg portion ofv said tap connection member being adapted to be connected to said tap lead, said leg portion extending at right angles to the plane of said conductor.
5. In a reactive device, a coil formed of a conductor having a substantially rectangular cross section, and a tap connection member for connecting said coil to a tap lead, said tap connection member having a substantially T- shaped configuration with the leg portion extending from a side edge of its bar portion, said bar portion of said tap connection member having a substantially rectangular cross section, said coil having at least two sections, the ends of: said bar portion of said tap connection member being respectively integrally joined to one end of. each of two of said coil sections, said leg portion of said tap connection member being adapted to be connected to said tap lead, said ends of said coil sections to which said tap connection member is joined being otf-set from the remainder of said coil sections, said leg portion of said connection member extending over said coil and being spaced therefrom.
6. In a reactive device, a coil formed of a conductor having a substantially rectangular cross section, a tap connection member for connecting saidv coil to a tap lead, said tap connection member having a substantially T-sha-ped configuration with its leg portion extending from itsside edge of its bar portion, said bar portion and;
said leg portion of said tap connection member having,
a substantially rectangular cross section, said coil having at, least two. sections, the ends of said bar portion of said. tapv connection member being respectively integrally joined tov one end of each of two of said coil sections, the legv portion of said tap. connection member extending; at right angles. to the plane of said bar portion, and a tap, lead having a substantially rectangular cross section integrally joined to the end of said leg. portion ofv said tap connection member.
7. In a. reactive device, a coil formed ofa conductor having a substantially rectangular cross section, a tap connection, member for connecting said coil to a tap lead, said: tap connection member having a substantially T- shaped configuration with its leg portion extending from its side edge of its bar portion, said bar portion and said leg portion of said tap connection member havinga sub.- stantially rectangular cross section, said coil having; at least two sections, the ends of said bar portion of said tap connection member being respectively integrally joined toone end of each of two, of saidcoil sections, and a tap lead having asubstantially rectangular cross section integrally joined to the end of said leg portion of said tap connection member, said endof said coil sections to which said, tap connection member is joined being oft-set from the remainder of said coil sections, said tap-lead extending over said coil and being spaced therefrom.
References Cited in the file ofv this patent UNIT ED. STATES. PATENTS
US400874A 1953-12-29 1953-12-29 Tap structure for reactive device Expired - Lifetime US2866955A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3015744A (en) * 1959-08-19 1962-01-02 Gen Electric Rotor leads
US3054974A (en) * 1957-04-05 1962-09-18 Gen Electric Winding arrangement for foil wound transformer
US3195088A (en) * 1961-11-23 1965-07-13 Materiel Electrique S W Le High current winding for electrical inductive apparatus
US3371244A (en) * 1965-02-08 1968-02-27 Ultra Violet Products Inc Ultraviolet lamp transformer
US4761628A (en) * 1986-01-10 1988-08-02 Mitsubishi Denki Kabushiki Kaisha Electromagnetic induction apparatus with tap winding conductors
FR2735294A1 (en) * 1995-06-12 1996-12-13 Valeo Equip Electr Moteur STARTER OF A MOTOR VEHICLE PROVIDED WITH A REDUCED THICKNESS INDUCING COIL.
US20080012680A1 (en) * 2006-07-13 2008-01-17 Double Density Magnetics, Inc. Devices and methods for redistributing magnetic flux density
US20100134232A1 (en) * 2007-04-14 2010-06-03 Abb Technology Ag Electric component with winding and tapping

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1547497A (en) * 1924-02-15 1925-07-28 American Transformer Co Low-voltage heavy-current transformer
US2325810A (en) * 1941-09-19 1943-08-03 Budd Wheel Co Heating coil

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1547497A (en) * 1924-02-15 1925-07-28 American Transformer Co Low-voltage heavy-current transformer
US2325810A (en) * 1941-09-19 1943-08-03 Budd Wheel Co Heating coil

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3054974A (en) * 1957-04-05 1962-09-18 Gen Electric Winding arrangement for foil wound transformer
US3015744A (en) * 1959-08-19 1962-01-02 Gen Electric Rotor leads
US3195088A (en) * 1961-11-23 1965-07-13 Materiel Electrique S W Le High current winding for electrical inductive apparatus
US3371244A (en) * 1965-02-08 1968-02-27 Ultra Violet Products Inc Ultraviolet lamp transformer
US4761628A (en) * 1986-01-10 1988-08-02 Mitsubishi Denki Kabushiki Kaisha Electromagnetic induction apparatus with tap winding conductors
FR2735294A1 (en) * 1995-06-12 1996-12-13 Valeo Equip Electr Moteur STARTER OF A MOTOR VEHICLE PROVIDED WITH A REDUCED THICKNESS INDUCING COIL.
EP0749194A1 (en) * 1995-06-12 1996-12-18 Valeo Equipements Electriques Moteur Motorvehicle starter comprising field coil of reduced thickness
US5698922A (en) * 1995-06-12 1997-12-16 Valeo Equipment Electriques Moteur Starter for a motor vehicle
US20080012680A1 (en) * 2006-07-13 2008-01-17 Double Density Magnetics, Inc. Devices and methods for redistributing magnetic flux density
US7864013B2 (en) 2006-07-13 2011-01-04 Double Density Magnetics Inc. Devices and methods for redistributing magnetic flux density
US20100134232A1 (en) * 2007-04-14 2010-06-03 Abb Technology Ag Electric component with winding and tapping

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