The relationship between the stator and rotor leakage reactance of the induction machine (IM) according to IEEE Std 112 is assumed to be constant under all operating conditions. However, this is not substantially accurate during severe transients such as the direct online startup and loading conditions of a three-phase induction motor. The leakage reactance of the machine can vary widely during severe conditions. Hence, using constant parameters in the machine model will result in an inaccurate dynamic performance prediction. Moreover, considering a constant ratio between the stator and rotor leakage reactance is no longer valid for all current levels. In this article, a direct and precise method is proposed to estimate and separate the stator and rotor leakage reactance parameters under normal operating conditions and when the core is deeply saturated. The method exploits the two-dimensional time-stepping finite-element method (FEM) with a coupled circuit. The obtained current-dependent reactance functions in both leakage flux paths are included in the dq-model of the IM. Other machine parameters are determined by implementing the standard tests in FEM. To verify the effectiveness of the proposed method, the predicted results are compared to the dynamic responses obtained experimentally from a three-phase, 5-hp squirrel cage IM.

中文翻译：

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感应电机参数的确定及定转子漏电分流比对其性能的影响

根据 IEEE Std 112，感应电机 (IM) 的定子和转子漏抗之间的关系假定在所有操作条件下都是恒定的。然而，这在严重的瞬态过程中并不十分准确，例如三相感应电机的直接在线启动和负载条件。在恶劣条件下，机器的漏抗可能会有很大差异。因此，在机器模型中使用恒定参数将导致不准确的动态性能预测。此外，考虑定子和转子漏抗之间的恒定比率不再适用于所有电流水平。在本文中，提出了一种直接而精确的方法来估计和分离正常运行条件下和铁芯深度饱和时的定子和转子漏抗参数。该方法利用带有耦合电路的二维时间步进有限元方法 (FEM)。在两个漏磁通路径中获得的电流相关电抗函数包含在 IM 的 dq 模型中。其他机器参数通过在 FEM 中执行标准测试来确定。为了验证所提出方法的有效性，将预测结果与从三相 5 马力鼠笼 IM 通过实验获得的动态响应进行了比较。在两个漏磁通路径中获得的电流相关电抗函数包含在 IM 的 dq 模型中。其他机器参数通过在 FEM 中执行标准测试来确定。为了验证所提出方法的有效性，将预测结果与从三相 5 马力鼠笼 IM 通过实验获得的动态响应进行了比较。在两个漏磁通路径中获得的电流相关电抗函数包含在 IM 的 dq 模型中。其他机器参数通过在 FEM 中执行标准测试来确定。为了验证所提出方法的有效性，将预测结果与从三相 5 马力鼠笼 IM 通过实验获得的动态响应进行了比较。