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基于麦克斯韦方程和压磁理论建立了超磁致伸缩材料棒内的磁场分布模型,导出了含有材料磁弹性参数的超磁致伸缩材料棒磁场分布函数,讨论了材料特性参数对材料内部磁场和材料内部涡流损耗的影响。结果表明,材料内部磁场不仅与外激励磁场有关,而且与材料的压磁系数、杨氏模量及相对磁导率有关,同时材料内部磁场与外激励磁场间具有滞回特性;考虑材料特性参数时材料内部的涡流损耗达到最大值所需的材料半径,将大于不考虑材料特性参数时的半径值,同时涡流损耗的变化趋势也将变得和缓,而不论材料参数如何变化,超磁致伸缩棒内磁能损耗的基本规律没有发生变化。
Based on the Maxwell’s equations and the piezomagnetic theory, the magnetic field distribution model of the giant magnetostrictive rod was established. The distribution function of the giant magnetostrictive rod containing the material’s magneto-elastic parameters was derived. The influence of the material characteristic parameters on the magnetic field and material Effect of internal eddy current loss. The results show that the magnetic field inside the material is not only related to the external excitation field, but also to the piezomagnetic coefficient, the Young’s modulus and the relative permeability of the material. At the same time, the material’s internal magnetic field and the external excitation field have hysteresis characteristics. The material radius needed to reach the maximum eddy current loss within the material will be larger than the radius without material property parameters and the trend of eddy current loss will be moderated regardless of the change of material parameters. The basic law of magnetic energy loss in the rod has not changed.