NDLI: Overview of capacitive couplings in windings

Content Provider	IEEE Xplore Digital Library
Author	Djukic, N. Encica, L. Paulides, J.J.H.
Copyright Year	2015
Description	Author affiliation: Adv. Electromagn. BV, Sprang-Capelle, Netherlands (Djukic, N.; Encica, L.; Paulides, J.J.H.)
Abstract	The use of electrical machines (EMs) with variable-frequency drives (VFDs) results in electromagnetic interference (EMI). At high frequencies (HFs) of conducted EMI, the impedance of an EM insulation system fed from a VFD is small due to the parasitic capacitive couplings. Thus, the conducted EMI currents flow through the insulation into the other conductive parts of the machine or ground. This can cause damage to the insulation, accelerate corrosion and bearings, and influence other electrically and/or mechanically connected equipment in the system. In order to understand the phenomena of EMI and how to minimize it, one must understand parasitic capacitances in a VFD-cable-EM system. Many authors analyze the topic of parasitic capacitances of cables and machine's bearing capacitances. However, not many publications are focused on the detailed analysis of the windings. In most cases, the parasitic capacitances of the winding are represented as a part of a global equivalent RLC circuit. Some authors use simplified models such as solenoids, which are not adequate representatives of the actual winding topologies used in EMs. To date, not much attention is given to the actual distribution of parasitic capacitive couplings in the winding itself, especially for multi-layer coils. Therefore, it appears necessary to provide an overview of the models proposed in the literature and their implementation in the analysis of EMs. This paper presents capacitive couplings from the point of view of winding topology and conductor geometry, including insulation coating between conductors, and conductor and ground, which can be implemented in the winding equivalent RLC circuit, which can further be applied to analyze the machine's behavior at HFs. The discussion section at the end of this paper recommends further steps on how to determine the parasitic capacitive couplings in the future with more accuracy.
Starting Page	1
Ending Page	11
File Size	2349286
Page Count	11
File Format	PDF
e-ISBN	9781467367851
DOI	10.1109/EVER.2015.7112940
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-03-31
Publisher Place	Monaco
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Variable-frequency drive Coils Electric machines Windings Electromagnetic interference DH-HEMTs Pulse width modulation Cable insulation Capacitance Capacitive coupling Insulation system
Content Type	Text
Resource Type	Article

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