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50. On the application of extended grounded slot electrodes to reduce non-circulating bearing currents

Author

Vostrov, Konstantin, Pyrhönen, Juha, Niemelä, Markku, Lindh, Pia, Ahola, Jero, Lappeenrannan-Lahden teknillinen yliopisto LUT, Lappeenranta-Lahti University of Technology LUT, and fi=School of Energy Systems|en=School of Energy Systems

Subjects
electrical discharge machining bearing currents, electrical machines, finite element analysis, induction machines, Ball bearings, variable speed drives
Abstract

Power-electronic-Inverterconverter-induced motor bearing currents are a widespread problem in the field of electrical drives. Parasitic capacitances between the electrical machines parts provide a path for leakage currents, which finally harm the 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 overhang areas is wantedneeded. The Thiscurrent paper focuses on a countermeasure against the non-circulating bearing currents in the cluster of solutions at the motor side. The eElectrostatic shielding approach, which is a known principle to reduce capacitive couplings, is applied in electrical machines every now and then. In the currentis work, the principle of slot-embedded grounded electrodes is extended to cover also the end-windings. and tThus the electrodes provide a better shaft voltage mitigating effect compared to the case where electrodes are applying applied only inof the approach to the lamination stack area only. 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 inserted grounded electrodes were analyzed and corresponding conclusions were pointed out. Publishers version

Published
2022

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