EP 1791138 B1 20100804 - Process for degaussing using alternating current pulses in a conductive loop
Title (en)
Process for degaussing using alternating current pulses in a conductive loop
Title (de)
Entmagnetisierungsverfahren durch Wechselstromimpulse in einer in Schlaufen gelegten Leiterschleife
Title (fr)
Procédé de démagnétisation utilisant des impulsions de courant dans une boucle conductrice
Publication
Application
Priority
CH 18752005 A 20051124
Abstract (en)
[origin: EP1791138A1] Reproducible, capacitor-free demagnetization of ferromagnetic objects (30) involves using a low-frequency and frequency-modulated alternating current impulse produced by a current control (24), of variable amplitude and alternating current impulse width, in a conductor which may be connected in a capacitor-free manner between the input (27) and an output (28) of the current control. Reproducible, capacitor-free demagnetization of objects with a residual magnetism involves: (1) using a low-frequency and frequency-modulated alternating current impulse produced by a current control, of variable amplitude and alternating current impulse width, in a conductor which may be connected in a capacitor-free manner between the input and an output of the current control; and (2) producing a magnetic field impulse in the conductor which is flexible, completely insulated, unshielded and plastically deformable, and while forming a conductor loop (29) in any shape, is applied around an object to be demagnetized. The ends of the conductor loop are connected to the input and the output of the current control in a capacitor-free. The alternating current impulse of individual, alternatingly poled and symmetrical demagnetization impulses with controlled demagnetization impulse amplitude and alternating current impulse frequency of greater than 1 Hz is fed in, where the temporal course of the demagnetization impulse amplitudes is emulated by a demagnetization curve decaying in a non-exponential manner. The ratio of the smallest demagnetization impulse amplitude to the alternating current impulse amplitude maximum lies >=1:1000, and the conductor loop is removed after completion of the demagnetization of an object. An independent claim is included for a device for the reproducible, capacitor-free demagnetization of object with a residual magnetism.
IPC 8 full level
H01F 13/00 (2006.01)
CPC (source: EP US)
H01F 13/006 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
EP 1791138 A1 20070530; EP 1791138 B1 20100804; AT E476745 T1 20100815; DE 502006007578 D1 20100916; US 2007115603 A1 20070524
DOCDB simple family (application)
EP 06405403 A 20060926; AT 06405403 T 20060926; DE 502006007578 T 20060926; US 60108706 A 20061117