US2809264A - Plate-shaped inductor for inductive high-frequency heating - Google Patents

Plate-shaped inductor for inductive high-frequency heating Download PDF

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Publication number
US2809264A
US2809264A US371896A US37189653A US2809264A US 2809264 A US2809264 A US 2809264A US 371896 A US371896 A US 371896A US 37189653 A US37189653 A US 37189653A US 2809264 A US2809264 A US 2809264A
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inductor
plate
frequency heating
shaped
shaped inductor
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US371896A
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Dirk Christiaan Van Iperen
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US Philips Corp
North American Philips Co Inc
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US Philips Corp
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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
    • H05B6/362—Coil arrangements with flat coil conductors

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  • the invention relates to a plate-shaped inductor for inductive high-frequency heating which is characterized in that at least one of the sides forming the boundaries of the working opening is provided with an aperture, of which the edge adjacent the working opening is at least partly substantially parallel to the edge of the working opening in situ.
  • the plate-shaped inductor is provided with at least two apertures one on each side of the insulation between the supply points of the inductor, preferably in symmetrical arrangement.
  • the plate-shaped inductor 1, having a working opening 2 is provided with an aperture 3 in one of the sides, the edge 4 of the aperture on the side of the working opening 2 being parallel to the edge 5 of the working opening in situ.
  • the inductive electromagnetic field is capable of completing itself unhindered through the aperture 3 about the uniformly wide strip 6 of the inductor 1, as is indicated by arrows, since the resistance of the material of the inductor is absent at this area.
  • the aperture may be filled out more or less by a material having high permeability, for example, a ferrite, so that the field may be further intensified.
  • the inductor shown in Fig. 1 is furthermore provided with two additional apertures 8 and 9 symmetrically one on each side of the insulation 7, for example, an air gap, he edges iii and 11 of these apertures being parallel to he inner wall 12 of the inductor.
  • the heating of the work piece at this area is improved, so that the harmful effect of the air gap 7 may be more or less compensated.
  • the current is thus compelled to flow more along the corners 13, so that the length of the path is increased along the edge 1.2.
  • the two apertures 14 and 15 open in the outer edges 16 and 1'7 of the inductor, so that the full current is compelled to flow along the corners 13 and an increased effect is obtained.
  • An additional aperture 18 is provided on the side opposite the work piece in order to enhance the heating.
  • Such inductors are of particular importance for highfrequency soldering of iron tins and the like.
  • a C-shaped, plate-like inductor for high frequency heating defining a working aperture and having an air gap between the ends of said inductor, an elongated opening completely throu h and completely surrounded by the material of said inductor adjacent said working aperture having at least one bounding edge thereof substantially parallel to the adjacent edge of said working aperture.
  • a C-shaped, plate-like inductor as set forth in claim 1 further including a pair of apertures in the ends of said inductor adjacent to said air gap.
  • a C-shaped, plate-like inductor as set forth in claim 1 further comprising at least one recess in the outer marginal edge of said inductor and in a position adjacent said air gap.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)

Description

1957 D. c. VAN IPEREN 2,809,264
PLATE-SHAPED INDUCTOR FOR INDUCTIVE HIGH-FREQUENCY HEATING Filed Aug. 3, 1953 /o 712 I3 1 3 J? INVENTOR DIRK CHRISTIAAN VAN IPEREN United states Pater,
2,809,264 Patented Oct. 8, 1957 PLATE-SHAPED INDUCTOR FOR INDUCTIV E HIGH-FREQUENCY HEATING Dirk Cliristiaan van Iperen, Eindhoven, Netherlands, assignor, by mesne assignments, to North American Philips Company, Inc., New York, N. Y., a corporation of Delaware Application August 3, 1953, Serial No. 371,896
Claims priority, application Netherlands October 16, 1952 4 Claims. (Cl. 21910.79)
The invention relates to a plate-shaped inductor for inductive high-frequency heating which is characterized in that at least one of the sides forming the boundaries of the working opening is provided with an aperture, of which the edge adjacent the working opening is at least partly substantially parallel to the edge of the working opening in situ.
This has the advantage that at the said area the electromagnetic field need not pass through the electrically conductive material of the inductor, so that the losses are reduced and a desirable stron er heating is obtained at that area.
According to a further feature of the invention the plate-shaped inductor is provided with at least two apertures one on each side of the insulation between the supply points of the inductor, preferably in symmetrical arrangement.
The disadvantage inherent in the use of the conventional plate-shaped inductors in that the heating of the work piece in the proximity of the insulation is frequently insufiicient to meet the requirements is thus mitigated.
In order that the invention may be readily carried into effect, it will now be described with reference to the accompanying drawing.
Referring to Fig. 1, the plate-shaped inductor 1, having a working opening 2, is provided with an aperture 3 in one of the sides, the edge 4 of the aperture on the side of the working opening 2 being parallel to the edge 5 of the working opening in situ. Thus the inductive electromagnetic field is capable of completing itself unhindered through the aperture 3 about the uniformly wide strip 6 of the inductor 1, as is indicated by arrows, since the resistance of the material of the inductor is absent at this area. If desired, the aperture may be filled out more or less by a material having high permeability, for example, a ferrite, so that the field may be further intensified.
The inductor shown in Fig. 1 is furthermore provided with two additional apertures 8 and 9 symmetrically one on each side of the insulation 7, for example, an air gap, he edges iii and 11 of these apertures being parallel to he inner wall 12 of the inductor. Thus also the heating of the work piece at this area is improved, so that the harmful effect of the air gap 7 may be more or less compensated. Moreover, the current is thus compelled to flow more along the corners 13, so that the length of the path is increased along the edge 1.2.
Referring to Fig. 2, the two apertures 14 and 15 open in the outer edges 16 and 1'7 of the inductor, so that the full current is compelled to flow along the corners 13 and an increased effect is obtained. An additional aperture 18 is provided on the side opposite the work piece in order to enhance the heating.
Such inductors are of particular importance for highfrequency soldering of iron tins and the like.
What is claimed is:
1. A C-shaped, plate-like inductor for high frequency heating defining a working aperture and having an air gap between the ends of said inductor, an elongated opening completely throu h and completely surrounded by the material of said inductor adjacent said working aperture having at least one bounding edge thereof substantially parallel to the adjacent edge of said working aperture.
2. A C-shaped, plate-like inductor as set forth in claim 1 wherein a material having a high permeability is contained in said elongated opening.
3. A C-shaped, plate-like inductor as set forth in claim 1 further including a pair of apertures in the ends of said inductor adjacent to said air gap.
4. A C-shaped, plate-like inductor as set forth in claim 1 further comprising at least one recess in the outer marginal edge of said inductor and in a position adjacent said air gap.
References Cited in the file of this patent UNITED STATES PATENTS 2,128,086 Gakle Aug. 23, 1938 2,314,865 Bierwirth Mar. 30, 1943 2,456,091 Stevens et al. Dec. 14, 1948 2,641,682 McKenna June 9, 1953 2,692,934 Williamson Oct. 26, 1954 2,714,648 Blok et al. Aug. 2, 1955 FOREIGN PATENTS 740,385 Germany Sept. 2, 1943
US371896A 1952-10-16 1953-08-03 Plate-shaped inductor for inductive high-frequency heating Expired - Lifetime US2809264A (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
NL2809264X 1952-10-16
NL729109X 1952-10-16
NL1005658X 1952-10-16
NL316945X 1952-10-16
NL1085160X 1952-10-16

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4458127A (en) * 1981-05-26 1984-07-03 Park-Ohio Industries, Inc. Inductor for annealing work hardened portions of structural beams
WO1985003833A1 (en) * 1984-02-15 1985-08-29 Ness Richard A Induction heating device for nozzles of containers
GB2478275A (en) * 2010-02-24 2011-09-07 Tubefuse Applic V O F Induction heating apparatus and method

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4707213A (en) * 1985-11-12 1987-11-17 Continental Can Company, Inc. Induction heating unit for heat bonding a lid having a metallic layer to a container
US4757175A (en) * 1987-01-02 1988-07-12 Continental Can Company, Inc. Induction heating coil
US4853510A (en) * 1987-01-02 1989-08-01 Continental Can Company, Inc. Induction heating coil

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2128086A (en) * 1938-08-23 Welding transformeb
US2314865A (en) * 1941-05-31 1943-03-30 Rca Corp Heating device
DE740385C (en) * 1937-09-11 1943-10-19 Aeg Inductor for spatially limited, inductive heating of work pieces
US2456091A (en) * 1945-03-12 1948-12-14 Induction Heating Corp Inductor for high-frequency induction heating
US2641682A (en) * 1949-04-04 1953-06-09 Kennametal Inc Induction heating unit
US2692934A (en) * 1951-06-15 1954-10-26 Ohio Crankshaft Co High-frequency inductor arrangement for controlling the induced heat pattern
US2714648A (en) * 1951-06-02 1955-08-02 Hartford Nat Bank & Trust Co High frequency heating

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2128086A (en) * 1938-08-23 Welding transformeb
DE740385C (en) * 1937-09-11 1943-10-19 Aeg Inductor for spatially limited, inductive heating of work pieces
US2314865A (en) * 1941-05-31 1943-03-30 Rca Corp Heating device
US2456091A (en) * 1945-03-12 1948-12-14 Induction Heating Corp Inductor for high-frequency induction heating
US2641682A (en) * 1949-04-04 1953-06-09 Kennametal Inc Induction heating unit
US2714648A (en) * 1951-06-02 1955-08-02 Hartford Nat Bank & Trust Co High frequency heating
US2692934A (en) * 1951-06-15 1954-10-26 Ohio Crankshaft Co High-frequency inductor arrangement for controlling the induced heat pattern

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4458127A (en) * 1981-05-26 1984-07-03 Park-Ohio Industries, Inc. Inductor for annealing work hardened portions of structural beams
WO1985003833A1 (en) * 1984-02-15 1985-08-29 Ness Richard A Induction heating device for nozzles of containers
US4549051A (en) * 1984-02-15 1985-10-22 Ness Richard A Induction heating device for nozzles of containers
GB2478275A (en) * 2010-02-24 2011-09-07 Tubefuse Applic V O F Induction heating apparatus and method

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Publication number Publication date
FR1085160A (en) 1955-01-28

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