FREQUENCY DEPENDENCE OF MAGNETOSTRICTION FOR MAGNETIC ACTUATORS
Thant P. P. Phway – Antony J. Moses – David C. Jiles
The frequency dependence of magnetostriction is an important characteristic of magnetic materials when considering possible applications in sensors and actuators. In this study, magnetostriction of grain oriented silicon steel sheets, 303 mm long by 30 mm wide by 0.27 mm thick has been measured in the transverse rolling direction at frequencies in the range of 500 Hz to 3000 Hz. One end of a sample was clamped and displacement amplitude of the other end of the sample was measured using a “Single Point Laser Doppler Vibrometer” and from this, the magnitude of peak-to-peak magnetostriction was determined. Results show a large variation in magnitude of peak-to-peak magnetostriction between 1500 Hz and 2500 Hz. A sharp increase in magnitude of magnetostriction was found at 2250 Hz.
Keywords: magnetostriction, frequency, resonance, laser vibrometer, electrical steels