Residual strain effects on a non-contact magnetoelastic torque transducer

Article type: Research Article

Authors: Andreescu, R.^a | Spellman, B.^{b; *} | Furlani, E.P.^c

Affiliations: [a] Applied Research Center, 12000 Jefferson Avenue, Newport News, VA, USA | [b] Formerly with Continental, 100 Electronics Blvd, Huntsville, AL, USA. Currently with BAE Systems, 308 Voyager Drive, Huntsville AL, USA | [c] Eastman Kodak Company, 343 State Street, Rochester, NY, USA

Correspondence: [*] Corresponding author. Tel.: +1 256 864 7039; E-mail: bert.spellman@knology.net

Abstract: A non-contact magnetoelastic torque transducer consisting of a non-magnetic shaft with a portion of its length coated with a magnetostrictive material is studied. A phenomenological theory is developed for predicting the magnetic field of the transducer as a function of coating properties, residual strain, and applied torque. This theory takes into account stress-induced anisotropy and variations in magnetoelastic energy within the coating. The resulting model is used to investigate the effect of quiescent stress states on the sensitivity, hysteresis and linearity.

Keywords: Magnetic torque sensor, non-contact torque sensor, magnetoelastic sensor, magnetostrictive torque sensor

DOI: 10.3233/JAE-2010-1078

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 32, no. 3, pp. 183-193, 2010