STUDY ON MAGNETIC FIELD ANALYSIS FOR DEVELOPING HIGHLY EFFICIENCY MOTORS CONSIDERING RESIDUAL STRESS AND ROTATING FIELD

利用单片测试仪（SST）测量了外加应力和旋转磁通作用下的磁特性。研究了将这些数据应用于电机磁场分析的方法。所得结果总结如下：1。测量系统的建立与测量精度的检验建立了数字测量系统，考察了相位误差和增益特性对测量精度的影响。应力外加条件下的磁特性测量和旋转磁通测量外加约70兆帕时的磁特性。对实际电机中观测到的椭圆长轴、短轴和谐波分量的不同组合下的旋转磁通损耗进行了测量，为数值分析提供了数据基础。收缩配合下磁特性的测量采用特制的H型线圈和改进的探针法测量了铝环收缩配合下环芯的微观磁特性。检测了局部磁特性。温度对钢磁特性的影响通过在烘箱中设置SST来测量钢磁特性随温度的变化。结果表明，铁损随温度的升高而降低，低牌号钢的迟滞损耗下降幅度显著。电机验证模型铁损分析及实验研究采用有限元法分析了考虑残余应力和磁场特性的电机验证模型铁损。通过与实测值的比较，探讨了铁损分析中存在的问题。

The magnetic characteristics when the stress is impressed and under rotating flux are measured using single sheet testers(SST). The method for applying these data to the analysis of magnetic field of motor is investigated. The results obtained are summarized as follows :1.Establishment of Measuring System and Examination of Measurement AccuracyA digital measuring system is established, and the effect of the phase error and characteristics of gain on the measurement accuracy is examined.2.Measurement of Magnetic Characteristics Under Stress Impressed Condition and Rotating FluxThe magnetic characteristics when until about 70 Mpa is impressed are measured. The iron losses due to rotating flux, under various combinations of long and short axes of ellipse and harmonic components which are observed in the actual motors, are measured and the data base for the numerical analysis is constructed.3.Measurement of Magnetic Characteristics Under Shrink FittingThe microscopic magnetic characteristics of ring core under shrink fitting of aluminum ring are measured using a special H coil and a modified probe method. The local magnetic characteristics are examined.4.Effect of Temperature on Magnetic Characteristics of SteelThe change of magnetic characteristics with the temperature is measured by setting SST in an oven. It is shown that the iron loss is reduced with the temperature, and the rate of decrease of hysteresis loss of low grade steel is remarkable.5.Analysis of Iron Loss of Verification Model of Motor and Experimental InvestigationThe iron loss of verification motor model is analyzed using FEM considering the residual stress and magnetic property under rotating field. The problems of the analysis of iron loss is examined by comparing with the measured values.