期刊
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
卷 70, 期 3, 页码 2286-2295出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2022.3172748
关键词
Ball bearings; electrical discharge machining bearing currents; electrical machines; finite element analysis; induction machines; variable speed drives
This article discusses the problem of motor bearing currents induced by power electronic converters and presents a countermeasure. By applying slot-embedded grounded electrodes in the end-winding area of the motor, the voltage between the shaft and ground caused by the currents can be reduced.
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 article focuses on a countermeasure against the noncirculating bearing currents in the cluster of solutions at the motor side. The electrostatic shielding approach, which is a known principle to reduce capacitive couplings, is applied in electrical machines every now and then. In this article, 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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