Extension of slot-opening-embedded electrostatic shields in the region of the end-winding to effectively reduce parasitic capacitive coupling

Vostrov, Konstantin; Pyrhönen, Juha; Ahola, Jero

doi:10.1109/iemdc47953.2021.9449512

Cited by 5 publications

(2 citation statements)

References 14 publications

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“…If the shielding principle or any other countermeasure is applied exclusively to the core area, the BVR reduction effect may not be sufficient to achieve the aforementioned safe values. As suggested in [23], the use of such an end-winding shielding system presents a structurally simple and effective system for reducing the BVR. The extended slot electric system is shown in Fig.…”

Section: The Objective Of the Current Workmentioning

confidence: 99%

“…This paper is an evolutionary continuation of works [22] and [10], where the design and principle of using slot-opening electrodes to reduce bearing currents were described. It is an extended version of the conference paper [23], in which it was proposed to use slot-opening electrodes to reduce parasitic capacitances both in the lamination zone and in the area of the end-windings.…”

Section: Introductionmentioning

confidence: 99%

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On the Application of Extended Grounded Slot Electrodes to Reduce Noncirculating Bearing Currents

Vostrov

Pyrhönen

Niemelä

et al. 2023

IEEE Trans. Ind. Electron.

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Power-electronic-converter-induced motor bearing currents are a widespread problem in the field of electrical drives. Parasitic capacitances between the electrical machine's parts provide a path for leakage currents, which finally harm metallic ball bearings. Remembering that end-windings have a significant contribution in building up stray capacitances, a countermeasure affecting both the lamination stack and end winding areas is needed. This paper focuses on a countermeasure against the non-circulating bearing currents in the cluster of solutions at the motor side. Electrostatic shielding approach, which is a known principle to reduce capacitive couplings, is applied in electrical machines every now and then. In this work, the principle of slot-embedded grounded electrodes is extended to cover also the end-windings. Thus, the electrodes provide a better shaft-to-ground voltage mitigating effect compared to the case where electrodes are applied only in the lamination stack area. The feasibility and effectiveness of such a countermeasure are investigated. Different options in terms of scaling of both the machine size and diameter of the electrodes were analyzed and corresponding conclusions were pointed out.

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Section: The Objective Of the Current Workmentioning

confidence: 99%