Efficient Use of Steels and Development of Low Loss Machines

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A method for calculating flux distrbutions in anisotropic materials and measuring technique of magnetic characteristics are investigated for the purpose of the development of low loss machines and making the efficient use of steel. The results obtained can be summarized as follows :1. Development of Softwares for Analysis of Flux Distributions in Anisotropic Materials(1) The functions Bx=fx (Hx, Hy), By=fy (Hx, Hy) are used for the magnetic characteristics of anisotropic materials.(2) The convergence characteristics of nonlinear iteration and matrix solver are improved by using relaxation and over relaxation factors, respectively.(3) The 3-D time periodic finite element method is developed for nonlinear steady state analysis.2. Development of Measurement Method for Magnetic Characteristics in Anisotropic Materials(1) Double yokes is used for measuring the magnetic characteristics in arbitrary directions of anisotropic materials.(2) The effect of the waveforms of B and H on the measured B-H curves is investigated.3. Development of Method for Estimating Iron LossesThe hybrid method which couples the calculation and the measurement is developed for loss estimation.4. Verification of SoftwareThe verification model is proposed, and results calculated using the developed method are in good agreement with measured results.5. ApplicationsThe developed analysis and measurement method are applied for the investigation of flux distribution in a reactor. The weight of the reactor is decreased while the efficiency is increased.