Selaus tekijän mukaan kokoelmassa "Vostrov, Konstantin"Tieteelliset julkaisut
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High-Speed Megawatt-Scale Induction-Motor Drives: Efficiency Maps and Drivetrains
Vostrov, Konstantin; Aarniovuori, Lassi; Pyrhönen, Juha (IEEE, 13.10.2022)Selection of a proper drivetrain for a certain application is an important and challenging task. To make the right choice, several factors must be considered. The performance of an electrical drive system is among the ... -
Irreversible demagnetization risk of rotor-surface-mounted permanent magnets at rated and short-circuit modes in two-pole multi-megawatt machines
Vostrov, Konstantin; Petrov, Ilya; Abramenko, Valerii; Pyrhönen, Juha; Aarniovuori, Lassi (IEEE, 12.09.2023)The flux density distribution of a rotor-surface-magnet two-pole 4 MW permanent-magnet synchronous machine with a solid rotor core is studied in three different operating modes: rated operation, two- and three-phase short ... -
Mitigating noncirculating bearing currents by a correct stator magnetic circuit and winding design
Vostrov, Konstantin; Pyrhönen, Juha; Niemelä, Markku; Ahola, Jero; Lindh, Pia (IEEE, 06.04.2020)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, ... -
Mitigation of inverter-induced noncirculating bearing currents by introducing grounded electrodes into stator slot openings
Vostrov, Konstantin; Pyrhönen, Juha; Lindh, Pia; Niemelä, Markku; Ahola, Jero (IEEE, 23.12.2020)Modern converter-supplied AC motors are exposed to bearing currents. Despite extensive research and development, the industry still does not have a final solution with acceptable cost and high efficiency. This paper focuses ... -
On the application of extended grounded slot electrodes to reduce non-circulating bearing currents
Vostrov, Konstantin; Pyrhönen, Juha; Niemelä, Markku; Lindh, Pia; Ahola, Jero (IEEE, 11.05.2022)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, ...