EP0021274A1 - Entmagnetisierungsvorrichtung - Google Patents

Entmagnetisierungsvorrichtung Download PDF

Info

Publication number
EP0021274A1
EP0021274A1 EP80103297A EP80103297A EP0021274A1 EP 0021274 A1 EP0021274 A1 EP 0021274A1 EP 80103297 A EP80103297 A EP 80103297A EP 80103297 A EP80103297 A EP 80103297A EP 0021274 A1 EP0021274 A1 EP 0021274A1
Authority
EP
European Patent Office
Prior art keywords
capacitor
inductor
demagnetized
piece
magnetic field
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.)
Withdrawn
Application number
EP80103297A
Other languages
English (en)
French (fr)
Inventor
Roberto Moretti
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.)
SKF Industrie SpA
Original Assignee
RIV SKF Officine di Villar Perosa SpA
RIV Officine di Villar Perosa SpA
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 RIV SKF Officine di Villar Perosa SpA, RIV Officine di Villar Perosa SpA filed Critical RIV SKF Officine di Villar Perosa SpA
Publication of EP0021274A1 publication Critical patent/EP0021274A1/de
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F13/00—Apparatus or processes for magnetising or demagnetising
    • H01F13/006—Methods and devices for demagnetising of magnetic bodies, e.g. workpieces, sheet material

Definitions

  • the present invention concerns a demagnetizer device.
  • the results described hereinabove are obtained by passing the piece to be demagnetized through a large solenoid supplied with alternating current.
  • the number of turns and the feeding current of the solenoid are chosen in such a way that at the centre of the solenoid the field generated is sufficient to bring to saturation the piece to be demagnetized.
  • the intensity of the magnetic field decreases gradually till it completely disappears at a suitable distance from the solenoid.
  • the demagnetizing devices of this type require that the piece to be demagnetized be displaced slowly within the solenoid, so that the number of pieces which can be demagnetized in a pre-established period of time results in being correspondingly reduced.
  • the object of the present invention is to provide a demagnetizing device which will allow to overcome the disadvantages of the prior art demagnetizing devices described hereinabove.
  • a demagnetizing device characterized in comprising at least an inductor apt to generate a magnetic field into which a piece to be demagnetized is immersed; at least a capacitor; a feeding circuit generating a D.C. voltage; . and switch means apt to connect the said capacitor initially to the said feeding circuit to charge the said capacitor, and then to the said inductor in order to generate an oscillating magnetic field of decreasing amplitude.
  • a feeding circuit 1 at the ends of which there is present a D.C. voltage of pre-established value, for example between 500 and 1000 V, has a positive terminal which is connected, through an anode cathode junction of a contrlled silicon diode 2, to a first terminal of a capacitor 3, a second terminal of which is connected to the other terminal of the feeding circuit 1.
  • a series circuit comprising a pair of controlled silicon diodes 4 and 5 connected in anti-parallel, and an inductor 6 connected in series-to the said diodes.
  • a proximity detector circuit 9 formed for example by means of an oscillator locked by the presence of a metal body disposed near a respective core, transmits an output signal to a processor and control circuit 10. This latter, according to the ON-OFF type signal received from the circuit 9, transmits respectively an enable signal to the grid of the controlled diode 2 or,alternatively,to the grids of the controlled diodes 4 and 5.
  • the proximity detector circuit 9 is housed near the coil 6 and, for example, in case this latter is formed by means of a solenoid, the said circuit 9 could be disposed within the solenoid itself.
  • Fig. 2 shows the behaviour of the intensity of the current flowing within the inductor 6 when this latter is connected in parallel to the previously charged capacitor 3.
  • Io indicates the maximum value to which the current is brought during the damped free oscillation which follows the said moment. Since the magnetic field inside the inductor 6 is directly proportional to the value assumed by the said current, Fig. 2 illustrates also the behaviour of the said magnetic field.
  • the proximity detector circuit 9 When the piece to be demagnetized is out of the zone tested by the proximity detector circuit 9, this latter emits a signal, for example a positive signal, to the processor circuit 10 which in turn transmits an enable signal to the grid of the controlled diode 2 and disable signals to the grids of the controlled diodes 4 and 5. Accordingly, the controlled diode 2 is conductive and the feeding circuit 1 charges the capacitor 3 up to the off-load voltage value of the feeding circuit.
  • the value Io which is assumed by the current within the inductor 6 substantially only once and for a very short period of time, namely during the first half period of damped oscillation, may also be of the order of some hundreds of Ampere.
  • any detector circuit 9 or processor circuit 10 may be used for the control of the controlled diodes 2, 4 and 5, and these latter may advantageously by substituted by more sophisticated switching devices, provided a capacitor is charged to a pre-established voltage and is discharged, in consequence of the reception of a control signal, onto an inductor so as to generate damped free oscillations of current and, consequently, magnetic field.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electronic Switches (AREA)
EP80103297A 1979-06-25 1980-06-13 Entmagnetisierungsvorrichtung Withdrawn EP0021274A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT6834579 1979-06-25
IT68345/79A IT1119003B (it) 1979-06-25 1979-06-25 Dispositivo smagnetizzatore

Publications (1)

Publication Number Publication Date
EP0021274A1 true EP0021274A1 (de) 1981-01-07

Family

ID=11309057

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80103297A Withdrawn EP0021274A1 (de) 1979-06-25 1980-06-13 Entmagnetisierungsvorrichtung

Country Status (2)

Country Link
EP (1) EP0021274A1 (de)
IT (1) IT1119003B (de)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0101922A1 (de) * 1982-07-27 1984-03-07 Zentralen Maschinostroitelen Institut Verfahren und Vorrichtung zur Behandlung von ferromagnetischen Werkstoffen
DE3421575A1 (de) * 1984-06-09 1985-12-12 Erich Dr.-Ing. 5300 Bonn Steingroever Elektrischer impuls-generator
FR2587969A1 (fr) * 1985-09-27 1987-04-03 Thomson Csf Dispositif de desaimantation, notamment pour batiments navals
EP0597181A1 (de) * 1992-11-07 1994-05-18 Felten & Guilleaume Energietechnik AG Verfahren und Vorrichtung zum Entmagnetisieren von magnetischen Werkstoffen
US5600808A (en) * 1989-07-20 1997-02-04 Fujitsu Limited Processing method by which continuous operation of communication control program is obtained
WO2001020621A2 (en) * 1999-09-16 2001-03-22 Redcliffe Magtronics Ltd. Demagnetisation of magnetic components
WO2006065745A1 (en) * 2004-12-13 2006-06-22 Baker Hughes Incorporated A method and apparatus for demagnetizing a borehole
DE102005020933A1 (de) * 2005-05-04 2006-11-09 Stz Mechatronik Verfahren zum Entmagnetisieren von magnetischen Kreisen und zur Messung von Magnetisierungskurven
US7969150B2 (en) 2004-12-13 2011-06-28 Baker Hughes Incorporated Demagnetizer to eliminate residual magnetization of wellbore wall produced by nuclear magnetic resonance logs
CN105118606A (zh) * 2015-09-11 2015-12-02 浙江大学 用于在线消除电磁式电流互感器剩磁的退磁电路及方法
RU2616508C2 (ru) * 2015-09-17 2017-04-17 Федеральное государственное унитарное предприятие "Крыловский государственный научный центр" Способ размагничивания судна и устройство для его реализации
DE102018127614A1 (de) 2018-11-06 2020-05-07 Albert Maurer Vorrichtung zum Entmagnetisieren von ferromagnetischen Materialien
CN111243825A (zh) * 2018-11-29 2020-06-05 阿尔贝特·莫伊雷尔 用于使铁磁材料消磁的装置
CN111983531A (zh) * 2020-07-09 2020-11-24 桐庐科邦磁性材料有限公司 一种磁铁充磁检测装置及检测方法
WO2022128685A1 (de) 2020-12-17 2022-06-23 Albert Maurer Elektronische schaltvorrichtung zum entmagnetisieren von ferromagnetischem material

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR946815A (fr) * 1947-05-14 1949-06-15 Appareil pour la désaimantation de pièces en fer ou en acier
US3418542A (en) * 1966-04-18 1968-12-24 Bell Inc F W Method and apparatus for demagnetization of multipole magnetic devices
DE2059290A1 (de) * 1970-12-02 1972-06-15 Klauschenz & Perrot Netzanschlussgeraet fuer elektromagnetische Spannplatten od.dgl.
GB1481190A (en) * 1974-10-04 1977-07-27 Deutsche Edelstahlwerke Ag Electrical circuit for magnetising and demagnetising permanent magnets
FR2369662A1 (fr) * 1976-10-26 1978-05-26 Schlumberger Prospection Procede et dispositif pour inscrire des marques magnetiques sur un cable
SU609129A1 (ru) * 1976-12-06 1978-05-30 Горьковский Автомобильный Завод Размагничивающее устройство

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR946815A (fr) * 1947-05-14 1949-06-15 Appareil pour la désaimantation de pièces en fer ou en acier
US3418542A (en) * 1966-04-18 1968-12-24 Bell Inc F W Method and apparatus for demagnetization of multipole magnetic devices
DE2059290A1 (de) * 1970-12-02 1972-06-15 Klauschenz & Perrot Netzanschlussgeraet fuer elektromagnetische Spannplatten od.dgl.
GB1481190A (en) * 1974-10-04 1977-07-27 Deutsche Edelstahlwerke Ag Electrical circuit for magnetising and demagnetising permanent magnets
FR2369662A1 (fr) * 1976-10-26 1978-05-26 Schlumberger Prospection Procede et dispositif pour inscrire des marques magnetiques sur un cable
SU609129A1 (ru) * 1976-12-06 1978-05-30 Горьковский Автомобильный Завод Размагничивающее устройство

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0101922A1 (de) * 1982-07-27 1984-03-07 Zentralen Maschinostroitelen Institut Verfahren und Vorrichtung zur Behandlung von ferromagnetischen Werkstoffen
DE3421575A1 (de) * 1984-06-09 1985-12-12 Erich Dr.-Ing. 5300 Bonn Steingroever Elektrischer impuls-generator
FR2587969A1 (fr) * 1985-09-27 1987-04-03 Thomson Csf Dispositif de desaimantation, notamment pour batiments navals
EP0217712A1 (de) * 1985-09-27 1987-04-08 Thomson-Csf Entmagnetisierungsanlage, insbesondere für Schiffe
US4734816A (en) * 1985-09-27 1988-03-29 Thomson-Csf Demagnetizing device especially for naval vessels
US5600808A (en) * 1989-07-20 1997-02-04 Fujitsu Limited Processing method by which continuous operation of communication control program is obtained
EP0597181A1 (de) * 1992-11-07 1994-05-18 Felten & Guilleaume Energietechnik AG Verfahren und Vorrichtung zum Entmagnetisieren von magnetischen Werkstoffen
WO2001020621A2 (en) * 1999-09-16 2001-03-22 Redcliffe Magtronics Ltd. Demagnetisation of magnetic components
GB2355591A (en) * 1999-09-16 2001-04-25 Redcliffe Magtronics Ltd Demagnetisation of magnetic components
WO2001020621A3 (en) * 1999-09-16 2001-09-27 Redcliffe Magtronics Ltd Demagnetisation of magnetic components
GB2435795A (en) * 2004-12-13 2007-09-05 Baker Hughes Inc A Method and apparatus for demagnetizing a borehole
WO2006065745A1 (en) * 2004-12-13 2006-06-22 Baker Hughes Incorporated A method and apparatus for demagnetizing a borehole
GB2435795B (en) * 2004-12-13 2009-01-14 Baker Hughes Inc A Method and apparatus for demagnetizing a borehole
US7913756B2 (en) 2004-12-13 2011-03-29 Baker Hughes Incorporated Method and apparatus for demagnetizing a borehole
US7969150B2 (en) 2004-12-13 2011-06-28 Baker Hughes Incorporated Demagnetizer to eliminate residual magnetization of wellbore wall produced by nuclear magnetic resonance logs
US8245771B2 (en) 2004-12-13 2012-08-21 Baker Hughes Incorporated Method and apparatus for demagnetizing a borehole
DE102005020933A1 (de) * 2005-05-04 2006-11-09 Stz Mechatronik Verfahren zum Entmagnetisieren von magnetischen Kreisen und zur Messung von Magnetisierungskurven
CN105118606A (zh) * 2015-09-11 2015-12-02 浙江大学 用于在线消除电磁式电流互感器剩磁的退磁电路及方法
RU2616508C2 (ru) * 2015-09-17 2017-04-17 Федеральное государственное унитарное предприятие "Крыловский государственный научный центр" Способ размагничивания судна и устройство для его реализации
DE102018127614A1 (de) 2018-11-06 2020-05-07 Albert Maurer Vorrichtung zum Entmagnetisieren von ferromagnetischen Materialien
CN111243825A (zh) * 2018-11-29 2020-06-05 阿尔贝特·莫伊雷尔 用于使铁磁材料消磁的装置
CN111983531A (zh) * 2020-07-09 2020-11-24 桐庐科邦磁性材料有限公司 一种磁铁充磁检测装置及检测方法
CN111983531B (zh) * 2020-07-09 2023-03-10 桐庐科邦磁性材料有限公司 一种磁铁充磁检测装置及检测方法
WO2022128685A1 (de) 2020-12-17 2022-06-23 Albert Maurer Elektronische schaltvorrichtung zum entmagnetisieren von ferromagnetischem material
CH718185A1 (de) * 2020-12-17 2022-06-30 Maurer Albert Elektronische Schaltvorrichtung und Verfahren zum Entmagnetisieren von ferromagnetischem Material.

Also Published As

Publication number Publication date
IT1119003B (it) 1986-03-03
IT7968345A0 (it) 1979-06-25

Similar Documents

Publication Publication Date Title
EP0021274A1 (de) Entmagnetisierungsvorrichtung
US4055740A (en) Induction heating apparatus using a saturable reactor for power control purposes
EP0608966B1 (de) Einstellbare Reaktanzvorrichtung und Verfahren
US4587486A (en) Switch for detecting a magnetic field
US3143689A (en) Magnetic recording tape erasure apparatus
US4617603A (en) Degaussing system for bulk demagnetization of previously magnetized materials
US3916310A (en) Electronic measuring instrument arrangement for measuring electrical A-C quantities
US3078396A (en) Demagnetizing apparatus
US3197658A (en) Proximity responsive device
US3158756A (en) Magnetic-field responsive electric switching device
Kim et al. Control and analysis of magnetic switch reset current in pulsed power systems
US2695384A (en) Inductive device of the saturable core type having flux regeneration characteristics
US3906251A (en) Plurality of selective sources for converter system
RU2059436C1 (ru) Устройство для электроимпульсной обработки и дезинтеграции материалов
US2247745A (en) Magnetizer
PL81841B1 (de)
JPS56158967A (en) Magnetism detector
US2906942A (en) Circuit arrangements for originating electric currents or potentials for signal or control purposes
SU871308A1 (ru) Устройство импульсного питани катушки индуктивности
US2419227A (en) Pulse generator
EP0513842A1 (de) Stromversorgungsapparat für das Antreiben eines Magnetrons
JPS5731477A (en) Pulse arc welding machine
US2738420A (en) Injection into charged particle accelerators
SU1053167A1 (ru) Устройство дл намагничивани и размагничивани
US20230420171A1 (en) Electronic switching device for demagnetizing ferromagnetic material

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): CH DE FR GB SE

17P Request for examination filed

Effective date: 19810518

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19830205

RIN1 Information on inventor provided before grant (corrected)

Inventor name: MORETTI, ROBERTO