Abstract
In this paper, the magnetostrictive characteristics of silicon steel sheet under sinusoidal, rectangular and triangular voltage excitations are studied by using a magnetostrictive strain measuring system (MST500). The magnetostrictive butterfly curves, time domain and frequency domain of magnetostriction are compared and analyzed. The results show that the size and distortion of magnetostriction increase with the increase of saturation degree of silicon steel under all excitation types. The distortion degree of magnetostriction under all rectangular voltage excitations is larger than which is under sinusoidal and triangle excitations, and the smaller duty cycle of rectangular excitations cause more serious distortion of magnetostriction. Finally, the A-weighted magnetostriction velocity level of silicon steel sheet under excitation of different types is calculated and compared. The results show that, because there are lots of high frequency magnetostrictive components, the noise produced by the rectangular excitations is much larger than produced by the sinusoidal and triangle excitations. This research provides experimental and data support for the vibration calculation of power equipment working under non-sinusoidal excitation.
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