Mitigation of Inverter-Induced Noncirculating Bearing Currents by Introducing Grounded Electrodes into Stator Slot Openings

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 article focuses on capacitive bearing currents. After a brief explanation of the phenomeno...

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Bibliographic Details
Published inIEEE transactions on industrial electronics (1982) Vol. 68; no. 12; pp. 11752 - 11760
Main Authors Vostrov, Konstantin, Pyrhonen, Juha, Lindh, Pia, Niemela, Markku, Ahola, Jero
Format Journal Article
LanguageEnglish
Published New York IEEE 01.12.2021
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Ball bearings
Capacitance
Converters
Electric potential
electrical discharge machining bearing currents
electrical machines
Electrodes
finite element analysis (FEA)
Finite element method
induction machines
Induction motors
Industrial development
Industries
Laboratory tests
Machining
R&D
Research & development
Stator windings
Stators
variable speed drives
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Summary: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 article focuses on capacitive bearing currents. After a brief explanation of the phenomenon, an unconventional approach for effective mitigation of the capacitive bearing currents is proposed. The approach suggests using grounded electrodes in the slot openings to reduce the stator-winding-to-rotor-core capacitance and thereby the bearing currents. Different electrode diameters are considered and evaluated by a finite element method (FEM) analysis. The results are verified by laboratory tests. The bearing voltage ratios of the original and modified induction motor are compared.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2020.3045695