USRE24462E - Dreyfus - Google Patents

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Publication number
USRE24462E
USRE24462E US44884154A USRE24462E US RE24462 E USRE24462 E US RE24462E US 44884154 A US44884154 A US 44884154A US RE24462 E USRE24462 E US RE24462E
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United States
Prior art keywords
winding
coils
stirring
phase
yoke
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Expired
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English (en)
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Publication of US2759035A publication Critical patent/US2759035A/en
Publication of USRE24462E publication Critical patent/USRE24462E/en
Expired legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/36—Coil arrangements
    • H05B6/367—Coil arrangements for melting furnaces
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/34—Arrangements for circulation of melts
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/02—Stirring of melted material in melting furnaces

Definitions

  • the present invention relates to an improvement in stirring windings for melting furnaces or hot metal mixers.
  • stirring windings have been constructed as conventional coil windings, i. e. like the stator windings of polyphase synchronous generators or asyn-chronous motors.
  • the winding is embedded in a coarsely laminated slotted iron core and is fixed therein by laying the conductors into the slots and by staying the long double-curved ends of the coils by means of strong screw joints.
  • Such a stirring winding consists of five coils which can be wound in a simple winding machine.
  • the coarsely laminated yoke may consist of two straight legs, which are joined together and positioned below the bottom of the furnace.
  • FIG. 1a is a wiring diagram for the coils of the stirring winding, I
  • Figures 2 and 2a show modified forms of a part-of the winding Figure 1, t
  • Figure 3 is an end view of the winding and core parts shown at Figures 2 and 4,
  • Figure 4 is a view corresponding to Figure 3 but showing a modified form of windings and cores arranged below a furnace bottom having staying girders.
  • the stirring winding is a two-phase winding for a furnace having a curved bottom.
  • the coarsely laminated iron yoke has its laminations indicated by vertical lines in Figures 3 and 4 and consists of two straight legs 30, which are joined together at an angle of 180u, where the centre angle of the furnace bottom is 21:.
  • Each leg supports coils having three current zones 1, 2, 3' and 3", 4, 5 respectively, wherein 3' and 3" constitute one current zone.
  • the wiring diagram for the coils of the stirring winding is shown in Figure 1a.
  • the coils 1, 3', 3" and 5 are fed from one phase while the coils 2 and 4 are fed from the other phase, the directions of the currents being indicated by full line arrows and dotted line arrows, respectively, for the corresponding phases.
  • the lightest yoke is obtained with n (n +n)
  • the coils of this configuration are all of equal radial dimensions so that the keeping of a stock of spare parts is facilitated.
  • the coils are insulated from each other by means of intermediate pieces 80.
  • the stirring windings may be protected by means of members of refractory material positioned between the winding and the bottom of the furnace.
  • Ventilation and cooling ducts 40 are arranged between the yoke 30 and the coils 20. See Figures 2 and 4, the flow of air being indicated by the arrows in Figure 2. Spacer bars are inserted between the coils and the yoke. The winding may also be constructed for internal water cooling as indicated in Figure 2a.
  • Measures may be taken for minimising the reactive power of the winding.
  • the new winding in contradistinction to the coil winding of the conventional type, in the new winding approximately the same fiux per cm. length of conductor emerges from its lower side and short sides. This flux does not contribute to the stirring forces but increases the reactive power to the same amount as or somewhat above the amount occurring in coil windings of the known type. It is therefore suitable to make the casing 50, by means of which the winding has to beprotected, of metal of low electric ohmic resistivity. In this case, eddy currents are generated in the casing, which eddy currents minimise the ineffective part of the magnetic flux with the result that the reactive power is reduced.
  • the yoke may consist of two straight legs, such as the legs 30 of Figure l, which legs are joined together in alignment with each other and suitably reinforced.
  • the .middle current zone would be divided into two equal halves.
  • the invention permits the division of the stirring means along their width into two or more narrower stirring means of equal length and equal zone distribution, which further facilitates the keeping of a stock of spare parts.
  • This construction also permits the introduction of one or more girders (preferably of non-magnetic material) which act as staying means for supporting the bottom of the furnace.
  • the staying means are indicated by the numeral 60.
  • a polyphase stirring winding system in which the middle section of the winding is divided into two equal halves symmetrically disposed about a central plane at right angles to the longitudinal extension of the winding.
  • a polyphase stirring winding system of the type described comprising five'successive sections arranged endto-end and with the middle section divided into two equal halves disposed symmetrically about a central plane at right angles to the longitudinal extension of the Winding, and a yoke consists of two equal legs joined together in alignment with each other to provide a reinforced junction.
  • a polyphase stirring winding system of the type described comprising five successive sections placed below a curved bottom of a molten metal container having a center angle of 2a, and the middle section being divided into two equal halves disposed symmetrically about a central plane at right angles to the longitudinal extension of the winding, and a yoke consists of two equal legs forming 'an angle of approximately 180-a at their junction point to provide a reinforced junction.
  • a polyphase stirring winding system comprising intermediate pieces whereby the coils carrying current of different phases are insulated from each other and a space provided between the coils and the yoke'for the purpose of cooling.
  • a polyphase stirring winding system comprising metallic members of low ohmic resistivity covering at least apart of the lateral and lower sides of the coils for minimizing the ineffective part of the magnetic flux.
  • a polyphase stirring Winding system in which at least two such stirring windings in substantially parallel relationship with each other are arranged below the container, and comprising supporting means arranged between said windings for staying the bottom of the container.
  • on induction stirrer for such metal having a winding system comprising a plurality of stationary electrical coils positioned adjacent the bottom of said container, said coils having an axis of the winding l'h'er'eof generally parallel to said bottom, the winding system being symmetrical with respect to a plane through the bottom of said container at right angles to a line joining the central points of the two ends of the winding system, and a poly-phase power source for cnergising said coils and producing ampere-turns therein, the ampore-turns of one part of the system being 90 out of phase with respect to the ampere-turns of another part of the system.
  • said winding sysfem including one part comprising two coil sections, said sections being connected to one phase of said power source and spaced apart from each other and having their ampere-turns 180 out of phase with each other, and another part connected to another phase and located between said spaced coil sections.
  • winding system being divided into two equal halves symmetrically disposed about said plane.
  • said winding-system comprising five successive coil sections arranged endto-end and with the middle section divided into two equal halves disposed symmetrically about said plane and a yoke comprising two legs, said legs joined together in alignment with each other.
  • said winding system comprising five successive coil sections placed below a curved bottom of a molten metal container, said bottom having a centre angle of 2a, and the middle section being divided into two equal halves disposed symmetrically about said plane, and a yoke comprising two legs, said legs joined together and forming an angle of approximately 18 0oc.
  • the winding system comprising intermediate pieces whereby the coils carrying current of difierent phases are insulated from each other and a space provided between the coils and the yoke for the purpose of cooling.
  • the winding system comprising metallic members of low ohmic resistivity covering at least a part of the lateral and lower sides of the coils for minimizing the inefiective part of the magnetic flux.
  • said induction stirrer comprising at least two winding systems in substantially parallel relationship with each other below the container and comprising supporting means arranged between said systems for staying the bottom of the container.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Furnace Details (AREA)
  • General Induction Heating (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
US448841 1953-08-11 1954-08-10 Dreyfus Expired USRE24462E (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB22108/53A GB721124A (en) 1953-08-11 1953-08-11 Electromagnetic stirring winding for melting furnaces and the like

Publications (2)

Publication Number Publication Date
US2759035A US2759035A (en) 1956-08-14
USRE24462E true USRE24462E (en) 1958-04-22

Family

ID=10174024

Family Applications (1)

Application Number Title Priority Date Filing Date
US448841 Expired USRE24462E (en) 1953-08-11 1954-08-10 Dreyfus

Country Status (6)

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US (1) USRE24462E (enrdf_load_html_response)
BE (1) BE531074A (enrdf_load_html_response)
CA (1) CA571943A (enrdf_load_html_response)
DE (1) DE1025541B (enrdf_load_html_response)
FR (1) FR1106428A (enrdf_load_html_response)
GB (1) GB721124A (enrdf_load_html_response)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2871279A (en) * 1956-10-30 1959-01-27 Asea Ab Security means for water cooled stirring windings
US2960556A (en) * 1957-04-03 1960-11-15 Asea Ab Electric stirring winding
US3012083A (en) * 1959-02-26 1961-12-05 Asea Ab Electric stirring windings
US3203768A (en) * 1961-08-01 1965-08-31 Westinghouse Electric Corp Apparatus of zone refining and controlling solute segregation in solidifying melts by electromagnetic means

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1185377A (fr) * 1956-02-02 1959-07-31 Asea Ab Dispositif à enroulement d'agitation pour fours métallurgiques
DE1533081B1 (de) * 1966-02-15 1971-01-21 Leybold Heraeus Gmbh & Co Kg Kernloser Induktionsofen zum Schmelzen und Ruehren von Metallen und Verfahren zum Betrieb dieses Ofens
SE466586B (sv) * 1988-12-07 1992-03-09 Asea Brown Boveri Elektromagnetisk omroerare foer straenggjutning

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE610530C (de) * 1935-03-12 Aeg Hochfrequenzinduktionsofen zum Erhitzen und Schmelzen von Chargen grosser Querabmessung und geringer Hoehe
US1791934A (en) * 1925-12-21 1931-02-10 Ajax Electrothermic Corp Induction heating
US1943802A (en) * 1930-03-18 1934-01-16 Ajax Electrothermic Corp Electric induction furnace

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2871279A (en) * 1956-10-30 1959-01-27 Asea Ab Security means for water cooled stirring windings
US2960556A (en) * 1957-04-03 1960-11-15 Asea Ab Electric stirring winding
US3012083A (en) * 1959-02-26 1961-12-05 Asea Ab Electric stirring windings
US3203768A (en) * 1961-08-01 1965-08-31 Westinghouse Electric Corp Apparatus of zone refining and controlling solute segregation in solidifying melts by electromagnetic means

Also Published As

Publication number Publication date
DE1025541B (de) 1958-03-06
GB721124A (en) 1954-12-29
CA571943A (en) 1959-03-10
US2759035A (en) 1956-08-14
BE531074A (enrdf_load_html_response) 1957-11-08
FR1106428A (fr) 1955-12-19

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