DC Current Sensing Drive Scheme for Ultra-Low Inductance PMSMs with Enhanced Low-Speed Performance

Kahyun Lee, Hyeon Gyu Choi

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

Abstract

This article introduces a method for driving ultra low inductance permanent magnet synchronous motors (PMSMs) that uses a single shunt current sensing approach to accurately reconstruct phase currents, even at very low speeds. The challenge with single shunt inverters is that they have dead zones where the phase currents cannot be reconstructed, and voltage injection to solve this can cause new problems with current ripple, which can be especially troublesome in ultra-low inductance motors. To avoid these issues, the article proposes a drive scheme that combines sequential two-phase excitation with an RC low-pass filter to average the dc current measurements per half-switching period, enabling three-phase current reconstruction regardless of the active vector duration. Experimental results demonstrate that this approach provides reliable current reconstruction at both startup and low speed without significant current ripple, and the article provides both steady-state and transient experiments to demonstrate the current reconstruction and dynamic control performance.

Original languageEnglish
Title of host publication2023 IEEE International Symposium on Sensorless Control for Electrical Drives, SLED 2023
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9798350335422
DOIs
StatePublished - 2023
Event2023 IEEE International Symposium on Sensorless Control for Electrical Drives, SLED 2023 - Seoul, Korea, Republic of
Duration: 16 Aug 202318 Aug 2023

Publication series

Name2023 IEEE International Symposium on Sensorless Control for Electrical Drives, SLED 2023

Conference

Conference2023 IEEE International Symposium on Sensorless Control for Electrical Drives, SLED 2023
Country/TerritoryKorea, Republic of
CitySeoul
Period16/08/2318/08/23

Bibliographical note

Publisher Copyright:
© 2023 IEEE.

Keywords

  • AC motor drives
  • current measurement
  • signal reconstruction
  • single-shunt
  • ultra-low inductance motor

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