Automated monitoring of magnet quality for permanent magnet synchronous motors at standstill

Jongman Hong, Doosoo Hyun, Sang Bin Lee, Jiyoon Yoo, Kwangwoon Lee

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

Demagnetization of permanent magnets (PM) used in synchronous motors (SM) can occur due to a combination of thermal, electrical, and/or environmental operating stresses. Since PM demagnetization results in degradation of motor performance, efficiency, and reliability, it is important to monitor the quality of PMs regularly. However, there are many limitations to the off-line and on-line methods currently used for magnet quality assessment. In this paper, a new inverter-embedded technique for automated monitoring of magnet quality for permanent magnet synchronous motors (PMSM) that overcomes the limitations of existing techniques is proposed. The main concept is to use the inverter to perform a standstill test whenever the motor is stopped to detect local or uniform PM demagnetization. The machine is excited with a pulsating field at different angular positions, and the change in the current peaks caused by the change in the degree of magnetic saturation due to demagnetization is observed. An experimental study on a 10hp PMSM verifies that local and uniform PM demagnetization can be detected with high sensitivity.

Original languageEnglish
Title of host publication2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009
Pages2326-2333
Number of pages8
DOIs
Publication statusPublished - 2009
Event2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009 - San Jose, CA, United States
Duration: 2009 Sep 202009 Sep 24

Publication series

Name2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009

Other

Other2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009
CountryUnited States
CitySan Jose, CA
Period09/9/2009/9/24

Keywords

  • AC machine
  • Condition monitoring
  • Demagnetization
  • Diagnostics
  • Inverter
  • NdFeB Magnet
  • Off-line testing
  • Permanent magnet
  • Pulsating magnetic field
  • Synchronous motor

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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  • Cite this

    Hong, J., Hyun, D., Lee, S. B., Yoo, J., & Lee, K. (2009). Automated monitoring of magnet quality for permanent magnet synchronous motors at standstill. In 2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009 (pp. 2326-2333). [5316464] (2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009). https://doi.org/10.1109/ECCE.2009.5316464