电磁炉电磁噪声多场耦合计算及降噪设计

Multi-field Coupled Prediction and Reduction of Electromagnetic Noise of Inductive Cookers

电磁炉的工作噪声会给使用者带来很大困扰,因而其降噪设计受到高度关注。研究由于电磁力引起的电磁振动噪声。首先从电磁炉电磁场及电磁力产生原理出发,分析由涡流引起的洛伦兹(Lorentz)力和磁化引起的开尔文(Kelvin)力的特征。阐述电-固-流-声多物理场耦合计算和数据传递方法,通过数值计算得到电磁力,并计算在此激励下多场耦合电磁振动噪声。计算与测试结果相对误差小于10%。根据噪声产生原理,提出降低电磁振动噪声的改进方案,并进行了仿真与试验验证。

Since the working noise of induction cookers brings a great annoyance to users,the noise control of the inductive cookers has become the major concern of the designers.In this paper,the electromagnetic noise caused by electromagnetic force is studied.Firstly,starting from the principle of electromagnetic field and electromagnetic force generations of the inductive cookers,the characteristics of the Lorentz force caused by the eddy current and the Kelvin force caused by magnetization are analyzed.Then,the electromagnetic-structure-flow-sound coupled prediction method and data transfer process are described.Through the electromagnetic force simulation,the multi-field coupled electromagnetic vibration noise is predicted.The difference between the coupled prediction result and the test result does not exceed 10%.Based on the principle of noise generation,an improved scheme for reducing electromagnetic vibration noise is proposed and verified by prediction and experiment.