A4 Conference proceedings

Normalization-based approach to electric motor BVR related capacitances computation


Publication Details
Authors: Ahola Jero, Muetze Annette, Niemelä Markku, Romanenko Aleksei
Publication year: 2018
Language: English
Title of parent publication: 2018 IEEE Applied Power Electronics Conference and Exposition (APEC)
Start page: 2868
End page: 2874
Number of pages: 7
ISBN: 978-1-5386-1181-4
eISBN: 978-1-5386-1180-7
eISSN: 2470-6647
JUFO-Level of this publication: 1
Open Access: Not an Open Access publication

Abstract

Electrical discharge machining (EDM) bearing
currents that may occur within electric machines of variablespeed-
driven motor systems have been recognized for a long time.
One important factor of influence, the capacitive voltage divider
“bearing-voltage-ratio” BVR of the machine strongly depends on
the rotor-to-frame and the stator winding-to-rotor capacitances
which 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 FEM simulations. The final
expressions not only allow relatively accurately predicting the
stator-winding-to-rotor and rotor-to-frame capacitances. They
are also easily applicable, so as to, for example, easily study the
sensitivity of the BVR towards changes of the different stator slot
parameters.


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Last updated on 2019-11-10 at 07:40