The conventional calculation of rotor losses in cage induction motors by the time-stepping finite element method requires the full slip waves of the rotor flux densities and currents. The calculations of the full slip waves are extremely expensive in CPU time, memory, and hard disk space for the induction motors with skewed slots and pulsewidth modulated supply. This article proposes a technique that reproduces those full slip waves by utilizing both the time varying and the spatial information of the rotor electromagnetic quantities and, hence, significantly saves the calculation cost. The more rotor bars per pair of poles the induction motor has, the more calculation cost this technique saves. The calculation costs of the proposed and conventional methods are compared for the rotor losses of a 5.5-kW inverter-fed skewed induction motor under load condition, and the calculated losses are validated by tests.

中文翻译：

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斜槽变频笼式感应电机转子损耗的快速求解

使用时间步长有限元方法计算笼型感应电动机转子损耗的常规计算需要转子磁通密度和电流的完整滑差波。对于具有斜槽和脉宽调制电源的感应电机，全滑波的计算在 CPU 时间、内存和硬盘空间方面非常昂贵。本文提出了一种利用转子电磁量的时变和空间信息来再现这些全滑波的技术，从而显着节省了计算成本。感应电机每对磁极的转子条越多，这种技术节省的计算成本就越多。对 5 的转子损耗比较了建议方法和传统方法的计算成本。