US2832877A - Cross-field furnace having auxiliary poles without coils - Google Patents

Cross-field furnace having auxiliary poles without coils Download PDF

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Publication number
US2832877A
US2832877A US609169A US60916956A US2832877A US 2832877 A US2832877 A US 2832877A US 609169 A US609169 A US 609169A US 60916956 A US60916956 A US 60916956A US 2832877 A US2832877 A US 2832877A
Authority
US
United States
Prior art keywords
poles
field
cross
billet
auxiliary
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US609169A
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English (en)
Inventor
Dreyfus Ludwig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB Norden Holding AB
Original Assignee
ASEA AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to CA577104A priority Critical patent/CA577104A/fr
Application filed by ASEA AB filed Critical ASEA AB
Priority to US609169A priority patent/US2832877A/en
Application granted granted Critical
Publication of US2832877A publication Critical patent/US2832877A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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

Definitions

  • a substantially uni form heating along the periphery of the billet is attained in connection with the use of the convcyer chain mentioned above.
  • the particular feature of the invention is, that in a cross-field furnace in which an alternating field is produced plane-parallelly and at right angles to the longitudinal axis of the billet and symmetrically thereto, and which field is completed through the billet and laminated iron yokes, there are extended from these yokes four distinct poles, of which two co-axial poles having different polarities and working as main poles are provided with windings, while two other auxiliary poles arranged at an angle of 90 with respect to the main poles have no windings, said auxiliary poles causing a weakening of the field within the zones of the billet in front of the said auxiliary poles.
  • the furnace consists of two laminated yokes ll carrying the main polesZa and 211 from which the alternating field emerges, and of two auxiliary poles 3 turned 90 with respect to the main poles.
  • the winding is divided vertically into two equal parts 4a and 4b each embracing a main pole and having the same current direction on the one yoke and opposite direction on the other yoke. These winding parts arranged at an angle of 45 with respect to the main and auxiliary poles are separated from each "ice other by the auxiliary poles 3 having no windings.
  • the billet is designated by 5.
  • an auxiliary pole without winding weakens the branch of the main field within the billet below the arc of the auxiliary pole in an amount inversely proportional to the width of the air gap between the auxiliary pole and the billet.
  • the field diagram is shown for a quadrant of the furnace and a billet having square cross-section and rounded-off edges. Obviously such a billet has to be positioned with its one diagonal in the direction of the axis of the main poles. he field diagram shows both that it is easy to find a place within the main pole 2b for the supporting elements of the conveyor chain, not shown, and that the field intensity within the loss zone of the billet i. e.
  • the penetration depth indicated by the measure '7 will be largest at the auxiliary pole, despite of its considerable width as shown in the drawing by way of example. If the air gap of the auxiliary pole had been decreased additionally, it had been possible to further weaken there the field somewhat, but the power distribution obtained has been deemed to be sufficiently uniform. To this advantageous result contributes the fact that according to another feature of the invention the current density of the magnet coils decreases in the direction from the main poles toward the auxiliary poles.
  • the arrangement is usable for cylindrical billets having circular or elliptical cross-section.
  • the air gap in the upper main pole is provided for the sake of symmetry. It may be bridged by a yoke piece.
  • the winding is protected against heat radiation from the billet by wedges 8 of refractory material, and against over-temperatures by cooling loops 9 embedded within the auxiliary poles.
  • a cross-field furnace wherein the windings of the main poles are so arranged that their axial coil surfaces form 45 angles with the symmetry planes of the main and auxiliary poles, and one of the said main poles is provided with a gap for the passage of a convcyer means.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
US609169A 1956-09-11 1956-09-11 Cross-field furnace having auxiliary poles without coils Expired - Lifetime US2832877A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA577104A CA577104A (fr) 1956-09-11 Fourneau a champ croise ayant des poles auxilaires sans bobines
US609169A US2832877A (en) 1956-09-11 1956-09-11 Cross-field furnace having auxiliary poles without coils

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA577104T
US609169A US2832877A (en) 1956-09-11 1956-09-11 Cross-field furnace having auxiliary poles without coils

Publications (1)

Publication Number Publication Date
US2832877A true US2832877A (en) 1958-04-29

Family

ID=52285761

Family Applications (1)

Application Number Title Priority Date Filing Date
US609169A Expired - Lifetime US2832877A (en) 1956-09-11 1956-09-11 Cross-field furnace having auxiliary poles without coils

Country Status (2)

Country Link
US (1) US2832877A (fr)
CA (1) CA577104A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3663782A (en) * 1971-06-10 1972-05-16 United States Steel Corp Laminated iron core induction corner-heating unit
US4321444A (en) * 1975-03-04 1982-03-23 Davies Evan J Induction heating apparatus
US4472616A (en) * 1981-11-24 1984-09-18 Cem Compagnie Electro Mecanique Process and apparatus to obtain homogeneous transverse heating by electromagnetic induction of continuously passing long and thin products

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2176488A (en) * 1935-12-18 1939-10-17 Asea Ab Furnace for heating pieces by means of high frequency currents
US2480315A (en) * 1946-08-17 1949-08-30 Tube Turns Inc Method and apparatus for making pipe bends and the like
US2667524A (en) * 1950-01-14 1954-01-26 Asea Ab Induction heating furnace

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2176488A (en) * 1935-12-18 1939-10-17 Asea Ab Furnace for heating pieces by means of high frequency currents
US2480315A (en) * 1946-08-17 1949-08-30 Tube Turns Inc Method and apparatus for making pipe bends and the like
US2667524A (en) * 1950-01-14 1954-01-26 Asea Ab Induction heating furnace

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3663782A (en) * 1971-06-10 1972-05-16 United States Steel Corp Laminated iron core induction corner-heating unit
US4321444A (en) * 1975-03-04 1982-03-23 Davies Evan J Induction heating apparatus
US4472616A (en) * 1981-11-24 1984-09-18 Cem Compagnie Electro Mecanique Process and apparatus to obtain homogeneous transverse heating by electromagnetic induction of continuously passing long and thin products

Also Published As

Publication number Publication date
CA577104A (fr) 1959-06-02

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