ADVANCED METHOD FOR ANALYZING MAGNETIC FIELD AND APPLICATION

为了使磁场分析在实际设计中得到应用，研究了用有限元法和积分方程法提高磁场分析质量的方法，并对其在电机设计中的应用进行了探讨。主要研究成果如下：1.提高了磁场分析的质量。开发了一种高精度、少计算时间的基于边的有限元软件。通过对铁边的处理和未知量的选取，提高了积分方程法的精度，减少了计算时间。磁场分析的验证对Team International Factory标准模型的三维涡流、电磁力和铁耗进行了比较，并对数值分析中存在的问题进行了探讨。指出由于集肤效应，钢板中的滞回损耗在某些情况下是不能忽略的。非协调网格在电机设计中的应用问题研究表明，非协调网格在处理旋转问题时是有效的，而非稳态分析方法在运动分析中是有效的。高磁通密度和低频磁性能的测量为了设计紧凑和高效的机器，目前机器的运行磁通密度有时高达2T。在此基础上，利用最新研制的闭式磁路式双激励单片测试仪，研究了高磁通密度下旋转磁路下的磁特性。

In order to utilize the magnetic field analysis in the practical design, methods for improving the quality of magnetic field analysis using the finite element method and the integral equation method are investigated, and the application to the design of electrical and electronic machines are examined. The results obtained are summarized as follows :1. Improvement of Quality of Magnetic Field AnalysisThe edge - based finite element software, with high accuracy and short CPU time has been developed. The accuracy of the integral equation method is improved and the CPU time is reduced by examining the treatment of iron edge and the selection of unknown variable.2. Verification of Magnetic Field Analysis3-D eddy currents, electromagnetic forces and iron losses of standard models of TEAM International Workshop are compared, and the problems in the numerical analysis are examined. It is pointed out that the hysteresis loss in the steel plate cannot be neglected in some cases due to the skin effect.3. Problems in Applying to Design of Electrical MachinesIt is shown that the nonconforming mesh is useful in treating the rotation, and the de steady state analysis method is effective in the combined analysis with motion.4. Measurement of Magnetic Properties at High Flux Density and Low FrequencyThe operating flux density of recent machines is sometimes up to 2T in order to design compact and highly - efficient machines. Then, the behavior of magnetic properties under rotating flux at high flux density is clarified by utilizing a newly - developed closed magnetic path type of single sheet tester with double excitations.