Induction motor time-stepping finite-element analysis requires a lengthy transient response time to build up the complete steady-state magnetic field distribution in both stator and rotor. Various methods to speed up the convergence of the time-stepping finite-element (TS-FE modeling are investigated in this article. A so-called “virtual blocked rotor” technique is developed by using an eddy-current solver in the frequency domain to approximate the initial conditions, including the frozen permeabilities, potentials/energies, the stator winding and rotor bar currents, etc. Then, these well-prepared initial conditions are imported into the transient TS-FE time-domain solver (model). Significant reduction of the length of the transient response to reach convergence is accomplished. In addition, the promise of this method lies in its use in future large-scale design optimization studies. In order to further reduce the computational burden, a “virtual blocked rotor” concept/method in the TS-FE time-domain solution is also developed, which effectively reduces the required number of ac cycles and central processing unit real time to reach steady state.

中文翻译：

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基于虚拟闭塞转子技术的异步电动机时步有限元仿真快速稳态分析

感应电机时间步进有限元分析需要较长的瞬态响应时间才能在定子和转子中建立完整的稳态磁场分布。加速时间步进有限元收敛的各种方法（本文研究了 TS-FE 建模。通过在频域中使用涡流求解器开发了一种所谓的“虚拟阻塞转子”技术，以近似初始条件，包括冻结磁导率、电位/能量、定子绕组和转子条电流等，然后将这些准备好的初始条件导入瞬态 TS-FE 时域求解器（模型）。达到收敛的瞬态响应长度的长度已经完成。此外，这种方法的前景在于它在未来的大规模设计优化研究中的使用。为了进一步降低计算负担，TS-FE时域解决方案中还开发了“虚拟阻塞转子”概念/方法，有效减少了交流周期和中央处理器实时达到稳态所需的数量.