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Abstract
During the manufacturing process and use of ferromagnetic sheets, operations such as rolling, cutting, and tightening induce anisotropy that changes the material’s behavior. Consequently for more accuracy in magnetization and magnetostriction calculations in electric devices such as transformers, anisotropic effects should be considered. In the following sections, we give an overview of a macroscopic model which takes into account the magnetic and magnetoelastic anisotropy of the material for both magnetization and magnetostriction computing. Firstly, a comparison between the model results and measurements from a Single Sheet Tester (SST) and values will be shown. Secondly, the model is integrated in a finite elements code to predict magnetostrictive deformation of an in-house test bench which is a stack of 40 sheets glued together by the Vacuum-Pressure Impregnation (VPI) method. Measurements on the test bench and Finite Elements results are presented.
Highlights
Because of energy harvesting systems, magnetostrictive actuator design and noise reduction issues in electric devices, several papers deal with the topic of magnetostriction of ferromagnetic materials.giant magnetostrictive materials (GMMs) are widely used in transduction applications. the magnetostriction of ferromagnetic sheets used in electric devices such as transformers is an important source of noise [1]
The magnetostriction of ferromagnetic sheets used in electric devices such as transformers is an important source of noise [1]
The application of an external stress induces a variation of the macroscopic magnetization. This phenomenon is due to the magnetoelastic coupling and is modeled by the energy term given by Equation (11): Eσ “ ́σ : Sμ where σ and Sμ are respectively the stress and the magnetostriction tensors given in the material coordinate system (RD,TD)
Summary
Because of energy harvesting systems, magnetostrictive actuator design and noise reduction issues in electric devices, several papers deal with the topic of magnetostriction of ferromagnetic materials. The complexity of the phenomenon leads to several more or less accurate models depending on the application In this context, relatively recent works [2,3,4,5] dealing with structure magnetostriction computation or measurement show that the magnetic flux line direction change significantly affects results. A multidirectional anisotropic model calculating both magnetization and magnetostriction in ferromagnetic steel sheets is shown. This approach enables one to take into account both magnetic and magnetostrictive anisotropy in the same model. A comparison between measurements on the test bench and the finite elements simulation results will be shown
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