Smart Coils for Mitigation of Motor Reflected Overvoltage Fed by SiC Drives

Majid T. Fard, Jiangbiao He, Milad Sadoughi, Behrooz Mirafzal, Fariba Fateh

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

4 Scopus citations

Abstract

High dv/dt from the emerging SiC variable-frequency drives can easily induce overvoltage across the motor stator winding terminals, especially for long-cable-connected and high-voltage motor-drive systems. Due to the fast switching speed and surge impedance mismatch between cables and motors, this overvoltage can be two times or even higher than the DC-bus voltage of the inverter, resulting in motor insulation degradation or irreversible breakdown. The most common solution to mitigate such overvoltage is to install a dv/dt or a sinewave filter at the output of the drive, which decreases the efficiency and power density of the system. Among different stator coils, the first one (close to the drive side) is the most susceptible to insulation breakdown since it experiences higher overvoltage than the others due to the nonlinear distribution of the reflected surge voltages. In this paper, an innovative high-efficiency ultracompact mitigation solution is introduced, which is a tiny auxiliary circuit embedded inside the motor stator (or at the motor terminal box), specifically across the first few coils of each phase (i.e., smart coils). The proposed smart coil circuit effectively mitigates the surge overvoltage, which can be scalable to any type of motor-drive systems, regardless of cable length and semiconductor rise time. The proposed solution can dramatically improve the reliability, efficiency, and power density of motor-drive systems.

Original languageEnglish
Title of host publicationAPEC 2023 - 38th Annual IEEE Applied Power Electronics Conference and Exposition
Pages1429-1436
Number of pages8
ISBN (Electronic)9781665475396
DOIs
StatePublished - 2023
Event38th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2023 - Orlando, United States
Duration: Mar 19 2023Mar 23 2023

Publication series

NameConference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
Volume2023-March

Conference

Conference38th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2023
Country/TerritoryUnited States
CityOrlando
Period3/19/233/23/23

Bibliographical note

Publisher Copyright:
© 2023 IEEE.

Keywords

  • SiC converters
  • high dv/dt
  • long cables
  • motor drives
  • motor insulation
  • reflected voltage
  • smart coils

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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