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Optimization of electromagnetic and acoustic performances of power transformers

Abstract : This thesis deals with the prediction of the vibration of a multi-layer transformer core made of an assembly of electrical sheets. This magneto-mechanical coupled problem is solved by a stepping finite element method sequential approach: magnetic resolution is followed by mechanical resolution. A 3D Simplified Multi-Scale Model (SMSM) describing both magnetic and magnetostrictive anisotropies is used as the constitutive law of the material. The transformer core structure is modeled in 2D and a homogenization technique is implemented to take the anisotropic behavior of each layer into consideration and define an average behavior at each element of the finite element mesh. Experimental measurements are then carried out, allowing the validation of the material constitutive law, static structural behavior, dynamic structural behavior, and the noise estimation. Different materials geometries are considered for this workStructural optimizations are finally achieved by numerical simulation for lower vibration and noise emission of the transformer cores.
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  • HAL Id : tel-01684744, version 1

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Mingyong Liu. Optimization of electromagnetic and acoustic performances of power transformers. Mechanics of the solides [physics.class-ph]. Université Paris-Saclay, 2017. English. ⟨NNT : 2017SACLS256⟩. ⟨tel-01684744⟩

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