Approximate analytic solutions are useful when exact analytic solutions are too difficultor impossible to obtain or when the numerical solution of the problem can not be justified. Furthermore, an analytic solution pr...Approximate analytic solutions are useful when exact analytic solutions are too difficultor impossible to obtain or when the numerical solution of the problem can not be justified. Furthermore, an analytic solution provides a better insight to the physical significanceof various parameters effecting a given problem than a purely nuxnerical solution. Therefore, various approximate methods of analysis have been developed to solve heat-conduction problems, such as the integral method, the Ritz method, the Galerkin method, and so on.However, high accurate approximate solution in large scale is hardly obtained. In this paper a new approximate analytic method for transient heat--conduction problems in an infiniteplane wall was preseoted on the. basis of matrix theory and spline interpolation theory. Casesunder different boundary and initial conditions or heat generation can be conveniently dealtwith in a uniform way with this method. Compared with the exact solutions, this methodcan warrant high accuracy.展开更多
为了研究定子铁心采用非晶合金材料对永磁电机温度分布的影响,首先基于无限大平板层法对两种叠压系数非晶合金铁心试样轴向叠片的导热系数进行测试;然后利用电磁场软件对两台定子铁心分别采用非晶合金材料和硅钢片材料、其余结构尺寸完...为了研究定子铁心采用非晶合金材料对永磁电机温度分布的影响,首先基于无限大平板层法对两种叠压系数非晶合金铁心试样轴向叠片的导热系数进行测试;然后利用电磁场软件对两台定子铁心分别采用非晶合金材料和硅钢片材料、其余结构尺寸完全相同的1.6 k W永磁同步电机的损耗进行计算,在此基础上对两台电机的三维温度场进行仿真分析,并对比分析了硅钢片电机和非晶合金电机的温度分布规律;最后对这两台电机进行了温升试验,并将试验数据与计算结果进行对比,验证了分析、计算的有效性。展开更多
文摘Approximate analytic solutions are useful when exact analytic solutions are too difficultor impossible to obtain or when the numerical solution of the problem can not be justified. Furthermore, an analytic solution provides a better insight to the physical significanceof various parameters effecting a given problem than a purely nuxnerical solution. Therefore, various approximate methods of analysis have been developed to solve heat-conduction problems, such as the integral method, the Ritz method, the Galerkin method, and so on.However, high accurate approximate solution in large scale is hardly obtained. In this paper a new approximate analytic method for transient heat--conduction problems in an infiniteplane wall was preseoted on the. basis of matrix theory and spline interpolation theory. Casesunder different boundary and initial conditions or heat generation can be conveniently dealtwith in a uniform way with this method. Compared with the exact solutions, this methodcan warrant high accuracy.
文摘为了研究定子铁心采用非晶合金材料对永磁电机温度分布的影响,首先基于无限大平板层法对两种叠压系数非晶合金铁心试样轴向叠片的导热系数进行测试;然后利用电磁场软件对两台定子铁心分别采用非晶合金材料和硅钢片材料、其余结构尺寸完全相同的1.6 k W永磁同步电机的损耗进行计算,在此基础上对两台电机的三维温度场进行仿真分析,并对比分析了硅钢片电机和非晶合金电机的温度分布规律;最后对这两台电机进行了温升试验,并将试验数据与计算结果进行对比,验证了分析、计算的有效性。
