ATE53737T1 - ELECTRIC RESISTANCE HEATING ELEMENT WITH TEMPERATURE CONTROL. - Google Patents

ELECTRIC RESISTANCE HEATING ELEMENT WITH TEMPERATURE CONTROL.

Info

Publication number
ATE53737T1
ATE53737T1 AT81901612T AT81901612T ATE53737T1 AT E53737 T1 ATE53737 T1 AT E53737T1 AT 81901612 T AT81901612 T AT 81901612T AT 81901612 T AT81901612 T AT 81901612T AT E53737 T1 ATE53737 T1 AT E53737T1
Authority
AT
Austria
Prior art keywords
heating element
ferromagnetic material
temperature
current
curie temperature
Prior art date
Application number
AT81901612T
Other languages
German (de)
Inventor
Philip S Carter
John F Krumme
Original Assignee
Metcal Inc
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
Application filed by Metcal Inc filed Critical Metcal Inc
Application granted granted Critical
Publication of ATE53737T1 publication Critical patent/ATE53737T1/en

Links

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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material

Landscapes

  • General Induction Heating (AREA)
  • Control Of Resistance Heating (AREA)
  • Cookers (AREA)

Abstract

There are many situations requiring temperature regulation in heating elements which the prior art feedback control systems are not capable of handling adequately. In order to provide a temperature regulation in a narrow range around the Curie temperature, the heating element of the present invention is consisted of a substrate (35) or core (7) (25) of a nonmagnetic material having high thermal and electrical conductivity, clad with a surface layer (9) (27, 37) of a ferromagnetic material of relatively low electrical conductivity. When the heating element is energized by an electrical source (3) of high frequency alternating current, the skin effect initially confines current flow principally to the surface layer of ferromagnetic material. As temperature rises into the region of the Curie temperature of the ferromagnetic material, however, the decline in magnetic permeability of the ferromagnetic material causes a significant lessening of the skin effect, permitting migration of current into the high conductivity non-magnetic core, thereby simultaneously enlarging the cross-sectional area of the current flow path and expanding it into the highly conductive material; the resistance of the heating element becomes less due to both causes. By selecting the proper frequency for energization, by regulating the source to produce constant current, and by selecting dimensions and material parameters for the heating element, temperature regulation in a narrow range around the Curie temperature of the ferromagnetic material can be produced, despite considerable fluctuations in thermal load.
AT81901612T 1981-03-02 1981-03-02 ELECTRIC RESISTANCE HEATING ELEMENT WITH TEMPERATURE CONTROL. ATE53737T1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/US1981/000278 WO1982003148A1 (en) 1981-03-02 1981-03-02 Electrically resistive heating element having temperature control
EP81901612A EP0073190B1 (en) 1981-03-02 1981-03-02 Electrically resistive heating element having temperature control

Publications (1)

Publication Number Publication Date
ATE53737T1 true ATE53737T1 (en) 1990-06-15

Family

ID=22161126

Family Applications (1)

Application Number Title Priority Date Filing Date
AT81901612T ATE53737T1 (en) 1981-03-02 1981-03-02 ELECTRIC RESISTANCE HEATING ELEMENT WITH TEMPERATURE CONTROL.

Country Status (4)

Country Link
EP (1) EP0073190B1 (en)
AT (1) ATE53737T1 (en)
DE (1) DE3177193D1 (en)
WO (1) WO1982003148A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4701587A (en) * 1979-08-31 1987-10-20 Metcal, Inc. Shielded heating element having intrinsic temperature control
CA1214815A (en) * 1982-09-30 1986-12-02 John F. Krumme Autoregulating electrically shielded heater
US4752673A (en) * 1982-12-01 1988-06-21 Metcal, Inc. Autoregulating heater
ATE56476T1 (en) * 1984-03-06 1990-09-15 Metcal Inc HEAT TREATMENT PROCESS WITH SELF-REGULATORY HEATER.
KR102532402B1 (en) 2017-06-28 2023-05-16 필립모리스 프로덕츠 에스.에이. Electrical heating assembly, aerosol-generating device, and method for resistively heating an aerosol-forming substrate

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1975436A (en) * 1929-11-08 1934-10-02 Ugine Infra Method of heating by induction and furnace therefor
US2181274A (en) * 1938-05-11 1939-11-28 Utilities Coordinated Res Inc Induction heater construction
US2513778A (en) * 1946-11-09 1950-07-04 Chrysler Corp Heat-treating apparatus
US3218384A (en) * 1962-03-29 1965-11-16 Int Nickel Co Temperature-responsive transmission line conductor for de-icing
US3660585A (en) * 1970-06-24 1972-05-02 Robert D Waldron Frozen shell metal melting means
US4017344A (en) * 1973-03-05 1977-04-12 Harold Lorber Magnetically enhanced coaxial cable with improved time delay characteristics
FR2233685B1 (en) * 1973-06-12 1977-05-06 Josse Bernard
JPS5247583B2 (en) * 1974-01-09 1977-12-03
US4091813A (en) * 1975-03-14 1978-05-30 Robert F. Shaw Surgical instrument having self-regulated electrical proximity heating of its cutting edge and method of using the same

Also Published As

Publication number Publication date
DE3177193D1 (en) 1990-07-19
EP0073190B1 (en) 1990-06-13
EP0073190A4 (en) 1983-06-15
EP0073190A1 (en) 1983-03-09
WO1982003148A1 (en) 1982-09-16

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Legal Events

Date Code Title Description
UEP Publication of translation of european patent specification
EELA Cancelled due to lapse of time