【作者】 王军华；

【导师】 汪友华；

【作者基本信息】 河北工业大学 ， 电工理论与新技术， 2007， 硕士

【摘要】 电磁感应加热利用工件中涡流产生的焦耳热将工件加热，这种方法具有加热速度快、率高、控制精确、污染少等特点，在工业生产中具有广泛的应用前景。行波感应加热Traveling Wave Induction Heating，TWIH)除具有其他一些感应加热方式同样的优点外，能产生更均匀的温度分布，而且具有振动和工业噪音低、边缘效应好、加热均匀和三相载平衡、对电网影响小的显著优点，在加热非铁磁性带材时，因为电磁力的显著增加和热参数的变化，这一优点显得非常重要。简要介绍了感应加热技术的原理、特点、和发展现状，对行波磁场感应加热的基本原进行了说明，给出了二维和三维模型，并简要介绍了本课题的研究意义和主要研究内容。次，对电磁场数值计算有限元方法作了介绍，推导了感应加热工件内电磁场与涡流场分的理论公式以及涡流场方程的离散，建立了感应加热的有限元数学模型。介绍了ANSYS件中计算电磁场、涡流场的矢量磁位法，并介绍了感应加热技术的数值仿真方法。对行波感应加热二维模型进行合理简化，给出ANSYS中进行二维有限元分析的单元类，边界条件设置；根据行波磁场感应加热的特点，建立分析模型，确定了边界条件、网划分、材料特性等问题的处理方法。利用ANSYS软件对行波磁场感应加热进行二维研究，细计算分析了相同条件下行波感应加热系统与横向磁通感应加热系统中磁力线、磁感应度和涡流场以及功率密度的分布情况。此外，简要计算了在不同电源、不同气隙大小、同初级位置以及不同线圈结构下带材中的功率密度分布情况。以单线圈理论模型进行三维初步研究，推导线圈结构及其排布对带材中涡流分布的影；给出等效电路及ANSYS仿真模型，得出了影响涡流分布的初步规律。同时，对全文行总结，提出有待进一步研究和解决的问题。更多还原

【Abstract】 Traveling Wave Induction Heating (TWIH), involving three-dimensional non-liner coupled problem of eddy current field and temperature field for continuously moving strip, has particular features which make them attractive for application to some heating and melting processes in industry. Among the advantages we can mention the possibility to heat quite uniformly thin strips or regions of a body without moving the inductor above its surface, to reduce the vibrations of inductor and load due to the electro-dynamic forces and also the noise provoked by them, to obtain nearly balanced distributions of power and temperatureThe characteristic, development and present research situation of induction heating are briefly introduced. The background of this project, the main contents and the significance of this paper are mentioned. And the electromagnetic field value computational method is introduced. A mathematical model is developed to describe the distribution of electromagnetic field and eddy current density in the strip. The mathematical modal of electromagnetic fields is presented by a magnetic vector potential, which is also applied to solve eddy current field in ANSYS. And the analytical simulating methods for induction heating are represented.Mathematical model is offered for solving the coupled problem for TWIH. To improve the efficiency of eddy current field calculation, necessary simplification is applied and boundary conditions are accurately analyzed. The magnetic force and the final eddy current distribution demonstrated and analyzed. And the computation of power density distribution in the strip has analyzed under different power source frequency, different air gap size, different primary position as well as different coil structure, which is based on ANSYS software. Comparison of edge-effects of traveling wave and transverse flux induction heating is done.A single-coil model is applied to do basic three-dimensional study, and deduce the effect of coil structure and arrangement for the eddy current distributions. With the results, as well as the equivalent circuit and ANSYS simulation model, we get some rules about what mainly influences the distribution of inducting eddy current.更多还原