基于多物理场耦合方法的变压器电磁振动噪声分析

Analysis of transformer electromagnetic vibration noise based on multi-physical field coupling method

变压器噪声随电压等级和容量的不断提升而日益严重,研究变压器噪声对合理评估设备的声品质及降噪分析具有重要意义。文章通过建立电磁-结构-声场多物理场耦合模型,基于热应力比拟法和有限元法计算铁芯的磁致伸缩力和绕组的洛伦兹力并进行快速傅里叶变换(FFT),得到电磁力主要谐波分量的大小;将其结果作为振动谐响应分析的激励源,获取各频率点的位移结果;将位移结果作为激励源进行声场分析,得到变压器的噪声分布情况,并与试验结果进行对比分析,验证了该模型的可靠性。

Transformer noise is becoming more and more serious with the continuous improvement of voltage level and capacity.It is of great significance to study transformer noise for reasonable evaluation of sound quality and noise reduction analysis of equipment.In this paper,a multi-physical field coupling model of magnetomechanical-acoustic is established.Based on the analogy method of thermal stress and the finite element method,the magnetostrictive force of iron core and the Lorentz force of winding are calculated,and FFT is performed to obtain the main harmonic components of the electromagnetic force.The results are used as the excitation source of the vibration harmonic response analysis to obtain the displacement results of each frequency point.The displacement results are used as the excitation source for sound field analysis,and the noise distribution of the transformer is obtained.The reliability of the model is verified by comparing with the test results.