US3728655A - Medium frequency transformer - Google Patents

Medium frequency transformer Download PDF

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Publication number
US3728655A
US3728655A US00264456A US3728655DA US3728655A US 3728655 A US3728655 A US 3728655A US 00264456 A US00264456 A US 00264456A US 3728655D A US3728655D A US 3728655DA US 3728655 A US3728655 A US 3728655A
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United States
Prior art keywords
winding
layers
primary
transformer
shaped zones
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Expired - Lifetime
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US00264456A
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English (en)
Inventor
F Reinke
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SMS Elotherm GmbH
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AEG Elotherm GmbH
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Publication date
Application filed by AEG Elotherm GmbH filed Critical AEG Elotherm GmbH
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Publication of US3728655A publication Critical patent/US3728655A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/10—Single-phase transformers

Definitions

  • ABSTRACT A medium frequency transformer having a single layer flat secondary winding, two flat layers forming a primary winding, and placed face to face, and a plurality of ferrite core members.
  • the faces of the secondary winding and of the primary winding layers each include two band shaped zones which are connected at their ends by U-shaped zones.
  • the core members are stacked to form hollow columns embracing the parallel band-shaped zones.
  • a clamping member is mounted at each end of the core stack columns.
  • the invention relates to a transformer, particularly for supplying energy to an inducter for heating workpieces.
  • a transformer is normally required to adapt the generator output to the requirements of the inductor.
  • the output side of the transformer is usually connected directly to the inductor.
  • the combined transformerinductor units of course must not foul each other as they move with the cranks.
  • This can be ensured is by keeping the overall dimensions of the medium frequency transformers in the direction normal to the crankshaft axis shorter than the center distance between two neighboring bearings that are to be hardened at the same time.
  • a medium frequency transformer which is of the required narrow designhas already been described in German Gebrauchsmuster No. 66 O7 290.
  • This transformer comprises a plurality of disc-shaped secondary and primary winding layers presenting a roughly annular face with the primary and secondary layers al-. ternately interleaved forming a stack.
  • the primary windings are electrically connected in series and the secondary layers in parallel, and the conductors of the windings are embraced by several frame-like ferrite cores extending radially in the form ofa star.
  • a medium frequency transformer comprising a flat single layer secondary winding and two flat layers of primary winding combined in a stack and provided with frame-like cores embracing the conductors of the winding.
  • the cores are made of ferrite and the overall dimensions of the transformer in a direction normal to the faces of the secondary winding and the layers of the primary winding are small in relation to its overall dimensions in a direction parallel to these faces, thus for different winding potentials transformers with essentially the same components and configuration can be used. Further the smallest overall dimension of the transformer is substantially determined only by the corresponding dimension of the frame-like cores.
  • the faces of the secondary winding and of the layers of primary winding each comprise two parallel band-shaped zones which are connected at their ends by U-shaped zones.
  • the frame-like core members are stacked with their side faces abutting to form hollow stacks embracing the parallel band-shaped zones of the faces of the winding respectively winding layers.
  • a clamping member is provided at each end of the stacks.
  • the primary connections are brought out through one of the clamping members and the secondary connections are brought out through the other clamping member.
  • the clamping member at the primary terminal end contains two connecting bars which are electrically connected by a bridge contact to a point on the primary winding layer forming the outer faces of the stack of windings. These points of contact may be located at the extreme ends of the primary winding layers or optionally one or two turns away from the ends to serve as intermediate taps.
  • the overall thickness of the flat secondary winding layer in the region of. the connections where the conductors overlap does not exceed or does not significantly exceed its thickness elsewhere.
  • the secondary winding consists of several hollow section conductors which are electrically connected in parallel, but contained in one layenThe interiors of the hollow section secondary winding conductors which are electrically connected in parallel are nevertheless preferably at least partly connected in series in so far as the flow of the coolanttherethrough is concerned.
  • the invention also relates to a production size range of such transformers.
  • the transformers are preferably in the range of substantially the same overall dimensions in directions normal to the lengthwise direction of the parallel band-shaped zones of the faces of the windings respectively winding layers.
  • the cores and clamping elements likewise have the same dimensions, but for rising winding potentials the number of cores and the length of the band-shaped zones of the faces of the winding or winding layer are increased.
  • FIGS. 1 and 2 are separate representations of a primary winding and of a secondary winding.
  • FIGS. 3 and 4 are two views of the fully assembled transformer.
  • FIG. is a section taken on the line I I in FIG. 3.
  • the transformer winding comprises two primary winding layers 1 (seen best in FIG. 1) which abut the two faces of a secondary winding 2 (shown in FIG. 2) in a manner forming a kind of stack.
  • the conductors of the windings 1 and 2 are embraced by a plurality of frame-like cores 3 (shown in FIG. 5) of ferrite material.
  • Each of the primary winding layers 1 consists of a flat copper tube 4 of rectangular cross section coiled to form a single layer pancake winding in such a way that the wider dimension of the copper tube is parallel to the layer.
  • the face of this winding layer comprises two parallel band-shaped zones 5 which are connected at each end by two U-shaped zones 6 and 7 to form the complete face.
  • the external end of the spirally wound layer, which is located in one of the U-shaped zones (6) is bent outwards and provided with a terminal fitting 8 for connection to a coolant circulating system, whereas the inner end is provided with an eyelet-shaped fitting 9.
  • the winding of the second primary winding layer (not shown) viewed from the inside outwards has a pitch contrary to that of the first primary winding layer and it has an external end 10 which is bent in a slightly different manner (indicated by chain lines in FIG. 1) to the end of the first layer.
  • the turns of the primary winding layers are provided with an electrically insulating coating applied by fluidization sintering.
  • Copper tubes 11 of the secondary winding 2 have roughly twice the internal cross section of the conductor tubes 4 of the primary winding and form the single layer secondary winding 2 which has a face consisting of two band-shaped parallel zones 5' and two U- shaped zones 6 and 7 in the same way as the primary winding layers.
  • Secondary winding 2 actually consists of two electrically parallel strands 12 and 13 of two copper tube conductors 11. Each conductor 11, in the U-shaped zone, is connected by a return loop so that they are in series in so far as the circulation therethrough of the coolant is concerned.
  • the thickness of the conductors is reduced sufficiently for the overall thickness of the winding to be roughly the same as that of the secondary winding in the other zones of its face.
  • the winding strand l2 incorporates two hollow copper tube lengths provided with coolant connections through which the coolant can be admitted and withdrawn in the direction indicated by arrows 16.
  • the secondary winding is also coated with an insulating film deposited by fluidization sintering in the same way as to the two primary winding layers.
  • the primary winding layers 1 and the secondary winding are combined in a stack.
  • the two primary winding layers 1 are connected at their inner ends by a pipe union 16 (FIG. 3) between their terminal fittings 9 so that they are in series electrically as well as for the circulation therethrough of the coolant.
  • Their outer ends 10 are connected to coolant connections 18 in a clamping member 17 resembling a box.
  • This box 17 also contains, in side-by-side juxtaposition but electrically insulated, two terminal bars 19 which by contact bridges 20 are connected to bright parts of the outside faces of the primary winding layers 1.
  • terminal bars 19 may be connected by the contact bridges 20 not only to the outer ends 10 of the primary winding layers 1, but alternatively also to taps at the end of the first respectively second turn.
  • Terminal bars 19 project from the box-like clamping member 17 and their ends, which are of different lengths, carry lugs 21 forming the primary winding terminals of the transformer.
  • box-shaped clamping member 17 Mounted on the box-shaped clamping member 17 are two stacks of frame-shaped core members 3 of ferrite, each column embracing one of the band-shaped zones 5 of the winding faces. Surmounting these stacks is a second clamping member 22, likewise of box shape, containing the ends of the single layer secondary winding 2 of which the terminal fittings 14 (FIG. 2) are connected to the secondary terminals 23 of the transformer as well as by hollow tube lengths 15 to pipe connectors 24 for the cooling system.
  • the stacks of magnetic ferrite cores 4 are compressed between clamping members 19 and 22 by tie rods 25 and they thus form a unit assembly.
  • FIG. 5 is a representation on a larger scale in the form of a section taken on the line I I in FIG. 3 of the relative positions of the conductors 4 respectively 11 of the primary winding layers 1 and of the secondary winding and of the frame-like ferrite core 3 surrounding the same.
  • the faces of the secondary winding and of the primary winding layers each comprise two parallel bandshaped zones which are connected at their ends by U-shaped zones said frame-like core elements are stacked to form hollow columns embracing the parallel bandshaped zones of the faces of the respective winding layers and a clamping member is provided at each end of the columns for securing the stack of magnetic cores.
  • a transformer according to claim 3, wherein the points that are electrically contacted by the contact bridges are located at least near the extreme ends of the primary winding layers to serve as intermediate taps.
  • a transformer comprising:
  • a plurality of core members stacked to form atleast two hollow columns each substantially surrounding a U-shaped zone of each of said layers and means at each end of said column for securing the stacked core members in that column.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • General Induction Heating (AREA)
US00264456A 1971-07-08 1972-06-20 Medium frequency transformer Expired - Lifetime US3728655A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2133987A DE2133987C3 (de) 1971-07-08 1971-07-08 Mittelfrequenz-Leistungstransformator mit einer einwindigen Sekundärwicklung

Publications (1)

Publication Number Publication Date
US3728655A true US3728655A (en) 1973-04-17

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ID=5813024

Family Applications (1)

Application Number Title Priority Date Filing Date
US00264456A Expired - Lifetime US3728655A (en) 1971-07-08 1972-06-20 Medium frequency transformer

Country Status (6)

Country Link
US (1) US3728655A (ja)
JP (1) JPS5338406B1 (ja)
DE (1) DE2133987C3 (ja)
FR (1) FR2144863B1 (ja)
GB (1) GB1383117A (ja)
IT (1) IT957759B (ja)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3878492A (en) * 1972-10-05 1975-04-15 Asea Ab Liquid-cooled transformer winding
US3936783A (en) * 1973-06-01 1976-02-03 Aeg-Elotherm G.M.B.H. Medium frequency power transformer with a secondary winding suitable for a rigid connection with an inductor through which the coolant flows
US4158123A (en) * 1975-02-28 1979-06-12 Tioxide Group Limited Series reactor
WO1984001237A1 (en) * 1982-09-13 1984-03-29 Marsden Electric Transformer construction
US4488135A (en) * 1982-07-29 1984-12-11 Schwartz Charles A Transformer for welding gun
US4577175A (en) * 1982-09-13 1986-03-18 Marelco Power Systems Transformer with fluid cooled windings
US4584551A (en) * 1984-09-24 1986-04-22 Marelco Power Systems Transformer having bow loop in tubular winding
US4775848A (en) * 1985-10-01 1988-10-04 Siemens Aktiengesellschaft High-voltage valve reactor, specifically for high-voltage direct-current transmission systems
US4897626A (en) * 1987-10-28 1990-01-30 Fitter Johan C Cooling electromagnetic devices
US5367760A (en) * 1993-04-26 1994-11-29 Terlop; William E. Method of making a narrow profile transformer
US5430426A (en) * 1993-09-13 1995-07-04 Tocco, Inc. Transformer
US6278355B1 (en) * 1999-08-23 2001-08-21 Square D Company Transformer winding
US20100258530A1 (en) * 2003-03-04 2010-10-14 Hitachi Kokusai Electric Inc. Substrate processing apparatus and producing method of device
US20120119609A1 (en) * 2010-11-17 2012-05-17 Motor Excellence, Llc Transverse and/or commutated flux system coil concepts
CN107195447A (zh) * 2016-05-19 2017-09-22 李群星 电压调控方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2420888C3 (de) * 1974-04-30 1982-02-11 Transformatoren Union Ag, 7000 Stuttgart Säulenartige Schleifringanordnung für den Wähler und Anzapfumsteller von Stufenschaltern für Transformatoren
FR2534737B1 (fr) * 1982-10-14 1986-12-26 Sciaky Intertechnique Transformateur electrique notamment pour installation de soudage par points
JPS6260669A (ja) * 1985-09-10 1987-03-17 Fujitsu Ltd プラテン機構

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1086041A (en) * 1913-01-30 1914-02-03 Hale & Kilburn Co Welding-machine.
US1129464A (en) * 1909-08-02 1915-02-23 Westinghouse Electric & Mfg Co Transformer and winding.
US1394044A (en) * 1919-03-25 1921-10-18 Gen Electric Water-cooled transformer
US1471096A (en) * 1919-05-08 1923-10-16 Gen Electric Electrical apparatus
US2114186A (en) * 1936-03-18 1938-04-12 Gen Electric Transformer
US2847651A (en) * 1956-06-26 1958-08-12 Robotron Corp Coupling transformer for radio frequency heating applications
US3419834A (en) * 1966-03-24 1968-12-31 Ian C. Mckechnie Electrical coils
US3503026A (en) * 1966-05-07 1970-03-24 Aeg Elotherm Gmbh Disc-shaped transformer
US3539959A (en) * 1968-05-17 1970-11-10 Gulf General Atomic Inc Transformer having sandwiched coils and cooling means

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1129464A (en) * 1909-08-02 1915-02-23 Westinghouse Electric & Mfg Co Transformer and winding.
US1086041A (en) * 1913-01-30 1914-02-03 Hale & Kilburn Co Welding-machine.
US1394044A (en) * 1919-03-25 1921-10-18 Gen Electric Water-cooled transformer
US1471096A (en) * 1919-05-08 1923-10-16 Gen Electric Electrical apparatus
US2114186A (en) * 1936-03-18 1938-04-12 Gen Electric Transformer
US2847651A (en) * 1956-06-26 1958-08-12 Robotron Corp Coupling transformer for radio frequency heating applications
US3419834A (en) * 1966-03-24 1968-12-31 Ian C. Mckechnie Electrical coils
US3503026A (en) * 1966-05-07 1970-03-24 Aeg Elotherm Gmbh Disc-shaped transformer
US3539959A (en) * 1968-05-17 1970-11-10 Gulf General Atomic Inc Transformer having sandwiched coils and cooling means

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3878492A (en) * 1972-10-05 1975-04-15 Asea Ab Liquid-cooled transformer winding
US3936783A (en) * 1973-06-01 1976-02-03 Aeg-Elotherm G.M.B.H. Medium frequency power transformer with a secondary winding suitable for a rigid connection with an inductor through which the coolant flows
US4158123A (en) * 1975-02-28 1979-06-12 Tioxide Group Limited Series reactor
US4488135A (en) * 1982-07-29 1984-12-11 Schwartz Charles A Transformer for welding gun
WO1984001237A1 (en) * 1982-09-13 1984-03-29 Marsden Electric Transformer construction
US4577175A (en) * 1982-09-13 1986-03-18 Marelco Power Systems Transformer with fluid cooled windings
US4584551A (en) * 1984-09-24 1986-04-22 Marelco Power Systems Transformer having bow loop in tubular winding
US4775848A (en) * 1985-10-01 1988-10-04 Siemens Aktiengesellschaft High-voltage valve reactor, specifically for high-voltage direct-current transmission systems
US4897626A (en) * 1987-10-28 1990-01-30 Fitter Johan C Cooling electromagnetic devices
US5367760A (en) * 1993-04-26 1994-11-29 Terlop; William E. Method of making a narrow profile transformer
US5473302A (en) * 1993-04-26 1995-12-05 Top Gulf Coast Corporation Narrow profile transformer having interleaved windings and cooling passage
US5430426A (en) * 1993-09-13 1995-07-04 Tocco, Inc. Transformer
US6278355B1 (en) * 1999-08-23 2001-08-21 Square D Company Transformer winding
US20100258530A1 (en) * 2003-03-04 2010-10-14 Hitachi Kokusai Electric Inc. Substrate processing apparatus and producing method of device
US20100323507A1 (en) * 2003-03-04 2010-12-23 Hitachi Kokusai Electric Inc. Substrate processing apparatus and producing method of device
US20120119609A1 (en) * 2010-11-17 2012-05-17 Motor Excellence, Llc Transverse and/or commutated flux system coil concepts
US8854171B2 (en) * 2010-11-17 2014-10-07 Electric Torque Machines Inc. Transverse and/or commutated flux system coil concepts
CN107195447A (zh) * 2016-05-19 2017-09-22 李群星 电压调控方法
CN107195447B (zh) * 2016-05-19 2018-11-16 唐山远宏电气设备有限公司 电压调控方法

Also Published As

Publication number Publication date
FR2144863B1 (ja) 1976-10-29
GB1383117A (en) 1975-02-05
DE2133987C3 (de) 1974-04-25
FR2144863A1 (ja) 1973-02-16
DE2133987A1 (de) 1973-01-25
IT957759B (it) 1973-10-20
DE2133987B2 (de) 1973-10-04
JPS5338406B1 (ja) 1978-10-16

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