This study provides an insight in the analytical estimation of the electric field along the surface of a stress grading system (SGS) in the end-winding region of an electrical machine. An analytical approach is derived for the field grading materials (FGMs) having power-law electric-field-dependent conductivity. Despite some limitations, the introduced model can be used for the preliminary analysis of SGS with specific geometric and dielectric parameters, both during sinus and pulsed voltage condition. The analytical considerations are verified with finite element simulations for 15 markedly different nonlinear FGMs, which were previously reported in the applications related to the medium voltage rotating electrical machines.

中文翻译：

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中压旋转电机非线性电阻电场控制的一维模型

这项研究提供了对电机末端绕组区域中沿着应力分级系统（SGS）表面的电场进行分析估计的见识。对于具有与功率定律电场相关的电导率的场分级材料（FGM），推导了一种分析方法。尽管存在一些局限性，但在正弦和脉冲电压条件下，引入的模型仍可用于具有特定几何和介电参数的SGS的初步分析。对15种明显不同的非线性FGM进行了有限元模拟，从而验证了分析方面的考虑，先前已在有关中压旋转电机的应用中进行了报道。