Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Magnetic saturation
Patent
1980-09-18
1983-05-24
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Magnetic saturation
324142, 324249, G01R 3300, G01R 120, G01R 3302
Patent
active
043852734
ABSTRACT:
A current-measurement transducer comprises a thin-film magnetic coil for passing an alternating premagnetizing current, generating an alternating premagnetizing field, and a magnetic-field comparator which includes first and second magnetic anisotropic films disposed in respective substantially parallel planes. Each film is composed of ferromagnetic and magnetoresistive material, and defines a magnetic easy axis, along which the film is relatively easily magnetizable, and a magnetic hard axis, at right angles to the easy axis, along which the film is harder to magnetize than along the easy magnetic axis. A non-magnetic and electrically at least poorly conducting layer separates the films, and the films are coupled to one another sufficiently tightly so that a current passing in one magnetic film generates an auxiliary magnetic field along the hard magnetic axis of the other magnetic film.
REFERENCES:
patent: 3621382 (1971-11-01), Valet
Bajorek et al.; "Magnetoresistive Current Sensor"; IBM Tech. Dis. Bull.; vol. 18; No. 8; Jan. 1976; pp. 2745-2748.
Bajorek et al.; "A Permalloy . . . "; IEEE Trans. on Magnetics; vol. MAG-12; No. 6; Nov. 1976; pp. 813-815.
Lienhard Heinz
Schneider Gernot
Karlsen Ernest F.
LGZ Landis & Gyr Zug AG
Marmorek Ernest F.
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