中文摘要：

电工钢片的磁致伸缩效应会使大容量电机定子铁心发生形变加剧电机振动噪声。近年来,随着实验测试技术的不断发展,国外已开展电工钢片磁致伸缩的测量与特性研究工作,国内还处于起步阶段。为深入研究旋转磁化下电工钢片的磁致伸缩效应,开发了基于三轴应变测量的单片电工钢片旋转磁致伸缩测量系统,研究了椭圆磁化轨迹在不同轴比、倾斜角及磁通密度下电工钢片磁致伸缩主应变矢量周期变化情况,建立了可供分析电机铁心磁致伸缩效应的数据库文件,并以三维插值曲面的形式描述了旋转磁化与磁致伸缩的关系。研究了一种计算电机定子铁心磁致伸缩效应的数值分析方法,以环形铁心模型为例实验验证了计算方法的有效性。研究表明,电工钢片的旋转磁致伸缩形变大于交变磁致伸缩,且随着磁化轨迹圆形程度的增加而增大。上述实验数据及旋转磁致伸缩特性分析为减小电机铁心的振动噪声研究提供了参考。

英文摘要：

Due to the magnetostrictive effect of electrical steel sheet, the deformation occurs in high-power motor stator core, which intensifies its vibration noise. In recent years, with continuous development of experimental test technique, the magnetostrictive measurement and property study on electrical steel sheet have been carried out overseas, but the relevant research in China is still in the initial stage. In order to investigate the magnetostrictive property of electrical steel sheet in rotating magnetic field deeply, the rotational magnetostrictive measurement system for a single electrical steel sheet was developed based on a triaxial strain gauge. The periodic variations of magnetostrictive principal strain vector were studied under various elliptical magnetization trajectories with different axial ratios, inclination angles and magnetic flux density values. A database file to analyze the magnetostrictive effect of motor core was built, and a 3-D interpolation surfaces was employed to describe the relationship between the rotational magnetization and magnetostriction. A numerical analysis method calculating the magnetostriction effect of motor core was presented, and taking a ring core model as an example, the validation of this method was verified by an experimental test. The research shows that the rotational magnetostrictive strain in an electrical steel sheet is bigger than altemating one, and increases with the increase of circular shape degree of magnetization. The test data and rotational magnetostrictive property analysis mentioned above provide a reference for the research of reducing the vibration and noise of motor.