ADVANCED METHOD FOR ANALYZING MAGNETIC FIELD AND APPLICATION

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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.