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.

中文翻译：

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硅钢片在不同类型激发下的磁致伸缩性能

本文利用磁致伸缩应变测量系统（MST500）研究了正弦，矩形和三角形电压激励下硅钢板的磁致伸缩特性。比较分析了磁致伸缩的蝶形曲线，时域和频域。结果表明，在所有激发类型下，磁致伸缩的尺寸和畸变随硅钢饱和度的增加而增加。在所有矩形电压激励下，磁致伸缩的畸变程度要大于在正弦和三角形激励下的磁致伸缩的畸变程度，并且矩形激励的较小占空比会导致磁致伸缩的更严重畸变。最后，计算并比较了不同类型的激励下硅钢板的A加权磁致伸缩速度水平。结果表明，由于存在许多高频磁致伸缩分量，矩形激励产生的噪声比正弦和三角形激励产生的噪声大得多。该研究为非正弦激励下动力设备的振动计算提供了实验和数据支持。