EP0161174B1 - Procédé de compensation thermique d'un circuit magnétique - Google Patents

Procédé de compensation thermique d'un circuit magnétique Download PDF

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Publication number
EP0161174B1
EP0161174B1 EP85400729A EP85400729A EP0161174B1 EP 0161174 B1 EP0161174 B1 EP 0161174B1 EP 85400729 A EP85400729 A EP 85400729A EP 85400729 A EP85400729 A EP 85400729A EP 0161174 B1 EP0161174 B1 EP 0161174B1
Authority
EP
European Patent Office
Prior art keywords
tablet
temperature
thermal compensation
permeability
oscillating circuit
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
Application number
EP85400729A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0161174A1 (fr
Inventor
Jacques Guillaumin
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.)
Jeumont Schneider SA
Original Assignee
Jeumont Schneider SA
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 Jeumont Schneider SA filed Critical Jeumont Schneider SA
Publication of EP0161174A1 publication Critical patent/EP0161174A1/fr
Application granted granted Critical
Publication of EP0161174B1 publication Critical patent/EP0161174B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/008—Details of transformers or inductances, in general with temperature compensation

Definitions

  • the present invention relates to a process for thermal compensation of a magnetic circuit, the losses of which increase as a function of the ambient temperature.
  • This device in particular used to detect the passage of the wheels of a wagon, comprises a series oscillating circuit with open air gap to the detection zone constituting a sensor, an oscillator connected to the oscillating circuit and a circuit for exploiting the overvoltage coefficient of the oscillating circuit.
  • This oscillating circuit includes coils of copper wires. The operation of such a device is based on the fact that when a metallic mass is located near the air gap, the overvoltage coefficient of the oscillating circuit decreases. This decrease indicates the presence of the metallic mass.
  • the object of the present invention is to obviate these drawbacks and to do this it relates to a method of thermal compensation of a magnetic circuit.
  • the document FR-A-2 025 984 describes a sweep feedback transformer, in which a temperature-sensitive ferrite plate is inserted in the air gap, this plate losing its ferromagnetism and becoming paramagnetic at a determined temperature, in order to avoid using a transformer with a large number of turns and without operating it near its saturation point, while stabilizing the high voltage well.
  • Document FR-A-2 422 930 describes a distance measuring device with a feedback circuit amplifier, comprising a detection coil inside which are arranged magnetic rods with high permeability, some with a positive temperature characteristic. , the others with a negative temperature characteristic, so that the variations in permeability as a function of temperature are practically zero.
  • the present invention more particularly relates to a method of thermal compensation of a series oscillating circuit formed by an alternating current generator, a capacitor and an inductor, characterized in that the inductor is formed by two windings each of which is wound around of one end of a magnetic core, and in that there is placed near one of the ends of the magnetic core a pellet of a material whose magnetic permeability is a decreasing function of the temperature and the point of Curie substantially equal to the maximum possible value of the ambient temperature, so that the reduction in the eddy current losses due to the variation in the permeability of the pellet compensates for the increase in these losses due to the variation in the temperature of the windings.
  • the material constituting the pellet is chosen from the group comprising soft iron and ferro-nickel and has a Curie point of the order of 40 ° to 50 ° C.
  • the single figure schematically represents a sensor made up of an oscillating circuit with open air gap, to which the thermal compensation process is applied.
  • the oscillating circuit consists of a low-loss capacitor 5 and an inductor 3, 4 connected in series with the capacitor 5.
  • the inductor consists of two identical windings connected in series and wound respectively on the two branches of a U-shaped magnetic core 6 constituting an open air gap.
  • the oscillating circuit closes on an alternating current generator 2 which supplies the circuit.
  • a patch 1 made of a material whose magnetic permeability is a decreasing function of the temperature and the Curie point substantially equal to the maximum possible value of the ambient temperature, is placed in the immediate vicinity of the inductance. It can be made integral, by bonding or molding of the impregnation resin surrounding one of the windings of the inductor, for example of the winding 3. This patch is placed in the magnetic field of the sensor and being conductive, it is therefore the seat of eddy currents.
  • the temperature increases we approach the Curie point of the material constituting the pellet, and the permeability thereof decreases, which causes the reduction of the eddy currents and therefore losses in the pellet. This compensates for the increase in losses due in particular to. increasing the resistance of the copper coils.
  • this thermal compensation method makes it possible to maintain a constant overvoltage coefficient of the oscillating circuit during an increase in the ambient temperature and as a result, the detector can permanently exhibit high stability and great sensitivity.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Measuring Magnetic Variables (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
  • Soft Magnetic Materials (AREA)
EP85400729A 1984-04-20 1985-04-12 Procédé de compensation thermique d'un circuit magnétique Expired EP0161174B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8406284 1984-04-20
FR8406284A FR2563368B1 (fr) 1984-04-20 1984-04-20 Procede de compensation thermique d'un circuit magnetique

Publications (2)

Publication Number Publication Date
EP0161174A1 EP0161174A1 (fr) 1985-11-13
EP0161174B1 true EP0161174B1 (fr) 1988-11-09

Family

ID=9303358

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85400729A Expired EP0161174B1 (fr) 1984-04-20 1985-04-12 Procédé de compensation thermique d'un circuit magnétique

Country Status (11)

Country Link
US (1) US4704578A (es)
EP (1) EP0161174B1 (es)
BR (1) BR8501811A (es)
CA (1) CA1226341A (es)
DE (1) DE3566186D1 (es)
ES (1) ES8704665A1 (es)
FR (1) FR2563368B1 (es)
IN (1) IN164640B (es)
MX (1) MX158953A (es)
PT (1) PT80313B (es)
ZA (1) ZA852940B (es)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH674896A5 (es) * 1987-11-20 1990-07-31 Vibro Meter Ag
US6246229B1 (en) * 1999-05-12 2001-06-12 Bently Nevada Corporation Method and apparatus for controlling the temperature stability of an inductor using a magnetically coupled metallic object
US20100147832A1 (en) * 2008-12-16 2010-06-17 Barker Iii Charles R Induction cookware identifying

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3194998A (en) * 1961-12-13 1965-07-13 Gen Electric Magnetic temperature-compensating structure
US3440718A (en) * 1965-07-12 1969-04-29 Physical Sciences Corp Method of temperature compensating an electrical apparatus
US3663913A (en) * 1967-12-22 1972-05-16 Tohoku Metal Ind Ltd Core coil having a improved temperature characteristic
DE1961951B1 (de) * 1968-12-12 1970-10-22 Matsushita Electric Ind Co Ltd Zeilenablenktransformator
CH509573A (de) * 1969-06-06 1971-06-30 Vibro Meter Ag Wechselstrom-Messanordnung mit einem Weggeber
US3891918A (en) * 1971-03-23 1975-06-24 James F Ellis Linear displacement transducer utilizing an oscillator whose average period varies as a linear function of the displacement
US3848466A (en) * 1974-01-30 1974-11-19 Atomic Energy Commission Magnetic temperature sensor
DE2643413A1 (de) * 1976-09-27 1978-03-30 Siemens Ag Induktiver messwertaufnehmer nach dem wirbelstromprinzip
US4270487A (en) * 1977-10-27 1981-06-02 Hitachi, Ltd. Developer regulating device in developing apparatus
SU681365A1 (ru) * 1978-03-07 1979-08-25 Московское Ордена Ленина И Ордена Трудового Красного Знамени Высшее Техническое Училище Им.Н.Э.Баумана Индуктивно-вихретоковый датчик с температурной самокомпенсацией
JPS54134462A (en) * 1978-04-11 1979-10-18 Nippon Kokan Kk Eddy flow system range finder
FR2469722A1 (fr) * 1979-11-12 1981-05-22 Saxby Dispositif detecteur de masses metalliques comportant des moyens de securite
US4449094A (en) * 1981-06-10 1984-05-15 Westinghouse Electric Corp. Temperature compensated magnetic damping assembly for induction meters

Also Published As

Publication number Publication date
BR8501811A (pt) 1985-12-17
MX158953A (es) 1989-03-31
DE3566186D1 (en) 1988-12-15
PT80313B (pt) 1987-05-29
CA1226341A (fr) 1987-09-01
FR2563368B1 (fr) 1987-06-19
ES542171A0 (es) 1987-04-16
ZA852940B (en) 1985-11-27
IN164640B (es) 1989-04-22
ES8704665A1 (es) 1987-04-16
PT80313A (fr) 1985-05-01
FR2563368A1 (fr) 1985-10-25
US4704578A (en) 1987-11-03
EP0161174A1 (fr) 1985-11-13

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