NDLI: A current threshold sensor

Content Provider	IEEE Xplore Digital Library
Author	Garshelis, I.
Copyright Year	1965
Abstract	A novel current threshold sensor of simple construction utilizes the precipitous reversal of magnetization within a cylindrical ferromagnetic shell endowed with a helical easy axis. When driven by a coaxially conducted alternating current of sufficient magnitude, the sense of the helical magnetization is periodically reversed. Emf pulses induced by these reversals in a coaxial solenoid distinguish currents slightly above or below a threshold value. An eminently practical source of the helical anisotropy is torsional stress. Residual stress distributions resulting from torsional overstrains during processing of wire or rod, create a helical easy axis without requiringexternal torque. The reduction of the effective coercive field with increasing torsional stress in many materials, allows for the continuous adjustment of the threshold value. Minimum current thresholds of about .3 A are determined by the need for immunity from ambient fields and limitations on current density. Maximum thresholds may reach 300 A. Thermal stresses within composite materials contribute to the temperature coefficient of threshold current.
Sponsorship	IEEE Magnetics Society
Starting Page	1809
Ending Page	1811
Page Count	3
File Size	520093
File Format	PDF
ISSN	00189464
Volume Number	15
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1979-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Residual stresses Thermal stresses Magnetic sensors Magnetization Coaxial components Solenoids Anisotropic magnetoresistance Wire Torque Current density
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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