A1 Journal article (refereed), original research
Normalization-based approach to electric motor BVR related capacitances computation
Publication Details Authors: Ahola Jero, Muetze Annette, Niemelä Markku, Romanenko Aleksei
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Publication year: 2019
Language: English
Related Journal or Series Information: IEEE Transactions on Industry Applications Volume number: 55
Issue number: 3
Start page: 2770
End page: 2780
Number of pages: 11
ISSN: 0093-9994
eISSN: 1939-9367
JUFO-Level of this publication: 2
Open Access: Not an Open Access publication
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Abstract
Electrical discharge machining bearing currents that may occur within
electric machines of variable-speed-drive motor systems have been
recognized for a long time. One key influential factor, the machine's
capacitive voltage divider “bearing-voltage-ratio” (BVR) strongly
depends on the rotor-to-frame and the stator winding-to-rotor
capacitances; these are, in turn, affected by the design of the
machine's stator slot. This paper presents an approach to improve the
accuracy with which these capacitances can be estimated. It is based on
the well-known plate capacitance equation which is then corrected by
normalization functions. The functions are defined by extensive
parameter studies using electrostatic finite element method (FEM)
simulations. The final expressions not only allow for the prediction of
the stator-winding-to-rotor and rotor-to-frame capacitances, they are
also readily applicable. Thereby, they facilitate, for example, the
clear-cut study of the sensitivity of the BVR towards changes in the
different stator slot parameters.