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Application of nanocrystalline alloys for force sensors

Józef L. Kwiczala 1Bogusław Kasperczyk 1Roman Kolano 2Aleksandra Kolano-Burian 2

1. Silesian University of Technology, Gliwice 44-100, Poland
2. Institute of Nonferrous Metals, Sowińskiego 5, Gliwice 44-100, Poland


     The nanocrystalline alloys applied to construction of the magnetoelastic force transducers have been tested. The magnetoelastic sensitivity and its dependence on the stress against the magnetic field direction is presented. The magnetoelastic properties have been investigated by means of specially constructed ring core. Transducers consisting of toroidally wound nanocrystalline ribbon with a magnetizing windings have been used.
     The ribbon ring core was made of nanocrystalline alloys. The special construction of the sample makes possible to excite the magnetic flux either parallel or perpendicular to the direction of the stress.
     The general idea of magnetoelastic force transducers is based on changes of the magnetic material properties caused by the stress following the force applied. In order to detect the changes, appropriate windings have been wounded on the core. Two kind of tape was used to construction of cores – with transversal and longitudinal magnetic anisotropy induced in ribbon and two method of placement of measuring windings in holes was applied – horizontally and vertically.
     The compressive stress decreases the permeability of the magnetic materials of the cores. The impedance of properly connection windings is also decreased as a result of external force. The change of the impedance of 10% may  be reached for compressive force of about 200 N. The sensor with core made of ribbon with transversal anisotropy and horizontally windings (parallel magnetic flux to stress) has the greatest sensitivity of the all tested sensors. The properties of nanocrystalline alloys are well suited for the stress sensors application.


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Presentation: Oral at E-MRS Fall Meeting 2008, Symposium C, by Józef L. Kwiczala
See On-line Journal of E-MRS Fall Meeting 2008

Submitted: 2008-05-17 17:16
Revised:   2009-06-07 00:48