Abstract
The principle of the magnetostrictive rod and coil assembly which provides an ac voltage output at fundamental excitation frequency, with amplitude proportional to applied torque and phase-reversible with torque direction is reviewed. The literature on applications of torsional magnetostriction and inverse-Weidemann effect is limited and widely scattered. A brief summary of some of the literature on instrumentation applications for measurement of torque, force, and other physical quantities is presented. Examples include measurement of torque in rotating shafts, dynamometers, accelerometers, flowmeters, and force balance sensors. For use as a guide in transducer design, a simplified mathematical representation of the torque-signal relationship for one mode of operation is developed from the equations of mechanical strain and applied magnetic field energy. Shape of the torque-signal curve is linear in the vicinity of zero torque, curving off to asymptotes at the extremes. Means for extending the results of tests on standard samples to design guides on rod diameter, coil turns, and excitation frequency are suggested.
Published Version
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