Different mechanisms by which bearing currents flow inside the electrical machine are well studied. In contrast, investigation and development of different techniques to mitigate these currents remain a field for improvement, and the final common solution to the problem has not been provided yet. In pursuit of addressing the problem, this article deals with noncirculating (or capacitive) bearing currents. The circuit mechanism of capacitive currents is explained in brief, and an approach for their mitigation is introduced. This article studies the influence of the stator winding and the slot geometry and presents different geometries to modify the motor to reduce the capacitive bearing currents. The effectiveness of the proposed mitigation technique is shown by finite-element-based modeling and verified by laboratory tests with different induction motor designs, where the winding and magnetic circuit geometries are varied. The technique can be used, in particular, for the mitigation of noncirculating currents, but it also offers potential for further research.

中文翻译：

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通过正确的定子磁路和绕组设计减轻非循环轴承电流


轴承电流在电机内部流动的不同机制得到了深入研究。相比之下，研究和开发不同技术来减轻这些电流仍然是一个有待改进的领域，并且尚未提供该问题的最终通用解决方案。为了解决这个问题，本文讨论非循环（或电容性）轴承电流。简要解释了电容电流的电路机理，并介绍了缓解电容电流的方法。本文研究了定子绕组和槽几何形状的影响，并提出了不同的几何形状来修改电机以减少电容轴承电流。所提出的缓解技术的有效性通过基于有限元的建模得到证明，并通过不同感应电机设计的实验室测试得到验证，其中绕组和磁路几何形状各不相同。该技术尤其可用于减轻非循环电流，但它也为进一步研究提供了潜力。