考虑力-磁耦合效应的无取向电工钢片磁致伸缩模型的改进

An Improved Magnetostrictive Model of Non-oriented Electrical Steel Sheet Considering Force-magnetic Coupling Effect

硅钢铁心结构的振动噪声成为制约电工装备节能化发展的瓶颈问题。采用夹紧措施可抑制铁心振动,但夹紧力会改变铁心磁性能,且施加不当可导致铁心振动加剧甚至损坏,原因为应力使硅钢材料磁畴产生旋转和壁移,引起磁致伸缩饱和,造成振动加剧。因此,为了实现硅钢铁心应力加载问题的准确预测,需建立基于应力下饱和磁畴壁移效应的电工钢片磁致伸缩模型。首先,该文提出基于力-磁耦合效应的磁致伸缩改进模型,并通过耦合Weiss分子场、退磁系数和钉扎效应参数考虑磁致伸缩的滞回特性;然后,测量无取向电工钢片的磁滞和磁致伸缩回线,提取控制饱和磁畴壁移的磁场和形变等模型参数;最后,编程实现模型的仿真,通过对比仿真及实验的磁致伸缩应变曲线,验证模型的准确性。

The vibration and noise of the silicon steel core structure have become the bottleneck problem restricting the electrical equipment’s energy-saving strategy.The clamping measures can suppress the vibration of the iron core.However,the clamping stress will change the magnetic property of the core.And the clamping stress range is improperly selected,which will aggravate the vibration of the iron core or even cause damages.The reason is that the stress causes the rotation and movement of the magnetic domain of silicon steel material,which leads to magnetostrictive saturation and intensification of vibration.Therefore,to realize the accurate prediction of the silicon steel core’s stress loading problem,a magnetostrictive electrical steel sheet model based on the saturated magnetic domain wall movement effect under stress should be established.Firstly,this paper proposed an improved magnetostrictive model based on the force-magnetic coupling effect.Hysteresis characteristics of the magnetostrictive loop were considered by the coupling Weiss molecular field,demagnetization coefficient,and pinning effect parameters.Then,the hysteresis and magnetostrictive loop of the non-oriented electrical steel sheet was measured,and the magnetic field and deformation parameters controlling the saturated magnetic domain wall movement were extracted.Finally,the improved magnetostrictive model was simulated by programming.The simulation and experimental curves of the magnetostrictive model with magnetic field changes under different stresses were compared to verify the model’s validity and accuracy.