The article presents an analytically rapid evaluation technique for interior permanent magnet (IPM) traction machines considering magnetic nonlinearity. First, a simplified model employing equivalent magnetic circuit together with winding function to determine no-load airgap flux density and dq -axis armature-reaction airgap flux densities for parameter determination is proposed. Then, a process loop is utilized for nonlinear magnetic analysis under full range on-load dq -axis currents. Using the obtained parameter information, losses/efficiency determination for tested machine could be achieved. It is shown that in the field-weakening (FW) operation region, the high-order synchronous flux density harmonics highly contributing to machine iron loss may also significantly contribute to magnetic saturation and therefore should be considered together with fundamental component for nonlinear magnetic analysis. In comparison to computationally expensive finite element analysis (FEA), sufficiently accurate parameters and efficiency for tested machine could be obtained within minutes. Thus, the proposed technique is very essential to rapidly evaluate a given design specification at the preliminary design stage where repeated adjustment on design specification is necessary for a multi-physics optimization achievement and with that, repeated re-construction and re-evaluation of FEA model may be undesirable. The proposed method is validated by FEA for a high-speed high-power (15 krpm/120 kW) IPM traction machine.

中文翻译：

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考虑磁非线性的内部PM牵引机快速评估的简化分析模型

本文提出了一种考虑到磁性非线性的内部永磁体（IPM）牵引机的分析快速评估技术。首先，采用等效磁路和绕组功能的简化模型来确定空载气隙磁通密度和dq 提出了用于参数确定的轴电枢反应气隙磁通密度。然后，将一个过程环路用于全范围有载情况下的非线性磁分析dq 轴电流。使用获得的参数信息，可以实现对被测机器的损耗/效率的确定。结果表明，在磁场减弱（FW）操作区域中，对机器铁损有重大贡献的高阶同步磁通密度谐波也可能对磁饱和产生重大影响，因此应与非线性磁分析的基本成分一起考虑。与计算上昂贵的有限元分析（FEA）相比，可以在数分钟内获得足够准确的参数和被测机器的效率。从而，所提出的技术对于在初步设计阶段快速评估给定的设计规范非常重要，在初步设计阶段，需要对设计规范进行反复调整以实现多物理场优化，因此，可能需要重复构建和重新评估FEA模型。不受欢迎的。FEA对高速大功率（15 krpm / 120 kW）IPM牵引机进行了验证。