In this paper calculation method of complex drawing piece on unfold size is given 本文提出了复杂拉深件展开尺寸的计算方法。
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In this paper calculation methods of various characteristics curves considering magnetic field nonlinear effect of synchronous generators is systematically studied . the comparison between the results and those without consideration of nonlinear effect is given . the magnetic field nonlinear effect on the operating characteristics is analyzed and the possible factors causing the nonlinear phenomenon is presented 本论文系统地研究了同步发电机在考虑磁场非线性的影响下各种特性曲线的计算方法，并与不计磁场非线性时的结果进行比较，分析了磁场非线性对同步发电机运行特性的影响以及可能引起磁场非线性的因素，并研究在考虑三元变量作用下采用插值法估算同步发电机的励磁电流和功角。
