考虑钉扎效应的电工钢片局部磁滞回环多尺度磁畴模拟

Multi-scale Magnetic Domain Simulation of Local Hysteresis Loop of Electrical Steel Sheet Considering Pinning Effect

高速电机高频高速及其驱动器存在谐波等特点导致供电系统谐波大的问题日益严重。谐波磁场会影响电工钢片的磁特性,降低电机功率,影响供电系统性能。因此准确的预测谐波状态下电工钢片的磁特性是一个亟需解决的问题。文中研究了遵循磁化过程中稳定状态对应于总能量极小值状态原理的多尺度磁畴模型,将介观尺度上的磁畴运动机制与宏观尺度上的磁化过程相结合。通过引入含有Stop算子的钉扎能对谐波状态下电工钢片的磁滞特性进行预测;引入磁弹性能有效地考虑表面绝缘涂层应力对谐波下磁特性和磁致伸缩的影响。最后将相同激励下的模拟结果与实验测量结果进行了对比,验证了谐波磁场下多尺度磁畴模型的有效性。

The harmonic characteristics of high frequency and high speed of high-speed motor as well as the its drive lead to more and more serious high harmonics in power system.The harmonic magnetic field can affect the magnetic characteristics of electrical steel sheet,reduce the power of motor and influence the performance of power supply systems.Therefore,accurately predicting the magnetic characteristics of the electrical steel sheet at harmonic condition is an urgent problem to be solved.In this paper,the multi-scale magnetic domain model which follows the principle that the steady state corresponds to the minimum value state of total energy during the magnetization process is studied and the magnetic domain movement mechanism on the mesoscopic scale is combined with the magnetization process on the macroscopic scale.The hysteresis characteristics of electrical steel sheets at harmonic conditions are predicted by introducing pinning energy containing the stop operator.The introduction of the magnetoelastic enery can consider effectively the influence of surface insulation coating stress on magnetic characteristics and magnetostriction at harmonics.Finally,the simulation and the experimental measurement results are compared at the same excitation and the effectiveness of the multi-scale magnetic domain model at the harmonic magnetic field is verified.