Mitigating High-Frequency Overvoltage on Motor Windings: An Adaptive Approach

Milad Sadoughi, Arya Sadasivan, Alex Howard, Fariba Fateh, Jiangbiao He, Behrooz Mirafzal

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

This paper examines the non-uniform overvoltage distribution on stator windings in AC motors driven by SiC-based inverters. The first coil of the stator winding experiences particularly severe overvoltage stress. To address this challenge, the paper suggests employing a circuit with adaptive impedance across the first coil. Surge impedance mismatch between the cable and motor has been identified as a cause of voltage reflection, leading to high-magnitude and high-frequency voltage ringing at the motor terminals. These overvoltage ringings/spikes pose a risk of insulation failure in the windings. To address this issue, the proposed adaptive circuit mainly includes a capacitor and a bidirectional gallium nitride (GaN) switch across the first coil. The purpose of this circuit is to ensure uniform voltage distribution by efficiently suppressing the occurrence of overvoltage spikes. A comprehensive experimental analysis is conducted to evaluate the effectiveness of the capacitor in mitigating voltage spikes, and the results are discussed in depth. The experimental setup involves a 2 hp, 460 V motor powered by a SiC-based inverter, connected through 4/C 10 AWG 30m and 18m cables. Preliminary experiments demonstrate that inserting a small capacitor during the initial few cycles effectively reduces overvoltage stress across the first coil by approximately 47%.

Original languageEnglish
Title of host publication2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023
Pages5170-5176
Number of pages7
ISBN (Electronic)9798350316445
DOIs
StatePublished - 2023
Event2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023 - Nashville, United States
Duration: Oct 29 2023Nov 2 2023

Publication series

Name2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023

Conference

Conference2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023
Country/TerritoryUnited States
CityNashville
Period10/29/2311/2/23

Bibliographical note

Publisher Copyright:
© 2023 IEEE.

Keywords

  • Overvoltage stress
  • SiC-based inverters
  • adaptive coil
  • motor drives
  • reflected wave phenomenon

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Electrical and Electronic Engineering

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