Development of Program of 3-D Finite Element Method for Analyzing Magnetic Fields in Electrical Machines Excited from Voltage Sources

本文提出了一种分析电压源激励电机三维磁场的新方法。编制了该方法的计算程序，并将该方法推广到时间周期现象的分析和多导体与电压源并联时环流的分析。主要研究结果如下：1.三维非线性分析的有限元公式和边界条件的研究有限元公式考虑到磁性材料的各向异性。对三维分析中的边界条件进行了研究，减少了计算机内存和CPU时间.电压源励磁电机磁场三维有限元分析方法的发展本文提出了一种将励磁电流作为未知量的新方法。3.程序的开发利用多种子程序，开发了三维磁场分析的高效程序。4.该方法在电机中的应用问题研究将其推广到含涡流的时间周期非线性磁场的分析。此外，它成为可能分析环流在并联连接到电压源的多导体。5.微型计算机上分析的扩展为了减少计算机存储量，引入了ICCG方法，使程序可以在微型计算机上运行。

A new method for analyzing 3-D magnetic fields in electrical machines excited from voltage sources has been developed. the program for the method is developed, and the method is expanded to the analysis of time-periodic phenomena and the analysis of circulating currents in multi-conductors connected in parallel to voltage sources. The results obtained can be summarized as follows:1. Finite Element Formulation for 3-D Nonlinear Analysis and Investigation of Boundary Conditions The finite element formulation is shown taking into account the anisotropy of magnetic materials. Boundary conditions in 3-D analysis is investigated, and the computer storage and the CPU time can be reduced.2. Development of 3-D Finite Element Method for Analyzing Magnetic Fields in Electrical Machines Excited from Voltage Sources A new method is developed by treating magntizing currents as unknown variables. It became possible to analyze magnetic fields in electrical machines under actual operating conditions.3.Development of Programs Efficient programs for analyzing 3-D magnetic fields are developed by utilizing many kinds of subroutines.4. Investigtion of Problems of Applying the Method to Electrical Machines The method is expanded for the analysis of time-periodic nonlinear magnetic fields with eddy currents. Moreover, it became possible to analyze circulating currents in multiconductors connected in parallel to voltage sources.5. Expansion to the Analysis on Micro-Computers In order to reduce the computer storage, the ICCG method is introduced so that the program can run on micro-computers.