Computation of the inverse magnetostriction and its application in mechanical stress sensing

This paper presents investigations on the modelling and use of inverse magnetostriction in contactless mechanical stress sensing. The emphasis is on the dynamic behaviour of the magneto-mechanical system and the eddy currents induced in the sensed part as well as their effect on the evaluation of the stress-induced magnetization and stress. The measurements show that the stress-induced magnetization depends strongly on the pre-magnetization. The simulations show that the eddy currents reduce the sensed voltage and the magnetic flux density and introduce time-delay. An analytical method is also proposed for online application.