Impact_of_PWM_Voltage_Waveforms_on_Magnet_Wire_Insulation_Partial_Discharge_in_SiC-Based_Motor_Drives.pdf (3.07 MB)
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Impact of PWM voltage waveforms on magnet wire insulation partial discharge in SiC-based motor drives

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journal contribution
posted on 01.12.2021, 09:40 by Mohamed DiabMohamed Diab, Wenzhi Zhou, Christopher Emersic, Xibo Yuan, Ian Cotton
Partial discharge (PD) is a prime cause of premature failure of inverter-fed motor winding insulation. With the emergence of fast-switching wide-bandgap silicon-carbide (SiC) power semiconductor devices, random-wound motors are more vulnerable to highly repetitive PDs due to the high-frequency steep-fronted switching transitions that result in overvoltage oscillations at the motor terminals and non-uniform voltage distribution within the motor winding turns. This article investigates the impact of the applied PWM voltage waveforms on the PD behavior in SiC-based inverter-fed motors, including two-level, three-level, and quasi-three-level PWM waveforms. The electric field distribution inside insulation defects (air cavities) is analysed for the different PWM voltage waveforms to theoretically predict the number and phase of probable PD events within the fundamental cycle. An experimental PD measurement setup is used to validate the theoretical analysis by applying the PWM voltage waveforms, that are generated by SiC-based power converters, on a typical turn-to-turn motor winding insulation system created by a twisted pair of enamelled magnet wire. Phase-resolved PD patterns are generated to assess the PD behavior against the PWM characteristics of each voltage waveform and the associated overvoltage pattern when power cables are used to emulate the voltage reflections in cable-fed motor drives. Detailed experiment specifications are provided in this article involving PD measurement methods and PD data post-processing algorithms. The obtained results are assessed and conclusions are drawn as a useful and timely reference that enhances the understanding of insulation PD process in SiC-based power electronics applications.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

IEEE Access

Volume

9

Pages

156599 - 156612

Publisher

Institute of Electrical and Electronics Engineers (IEEE)

Version

VoR (Version of Record)

Rights holder

© The Authors

Publisher statement

This is an Open Access Article. It is published by IEEE under the Creative Commons Attribution 4.0 International Licence (CC BY 4.0). Full details of this licence are available at: https://creativecommons.org/licenses/by/4.0/

Publication date

2021-11-18

Copyright date

2021

eISSN

2169-3536

Language

en

Depositor

Dr Mohamed Diab. Deposit date: 29 November 2021