Accurate SM Disturbance Observer-Based Demagnetization Fault Diagnosis With Parameter Mismatch Impacts Eliminated for IPM Motors

Yaofei Han, Shaofeng Chen, Chao Gong, Xing Zhao, Fanggang Zhang, Yunwei Li

Research output: Contribution to journalArticlepeer-review

69 Scopus citations

Abstract

This letter proposes a novel sliding mode (SM) disturbance observer-based technique to diagnose demagnetization fault of interior permanent magnet (IPM) motors with stator parameter mismatch impacts eliminated. First, the IPM motor model incorporating the disturbances caused by the PM demagnetization and stator parameter mismatch is established. Then, an SM disturbance observer is constructed to identify the overall disturbance caused by all parameters, with its stability discussed by using the Lyapunov function. Third, a current-analysis-based method is developed to extract the disturbance only caused by flux linkage mismatch from the overall disturbance. Third, the extracted disturbance is adopted to calculate the real flux linkage, achieving demagnetization fault judgment and demagnetization degree calculation. Finally, experiment is conducted on two IPM motors to validate the proposed flux linkage estimation and fault diagnosis methods.

Original languageEnglish
Pages (from-to)5706-5710
Number of pages5
JournalIEEE Transactions on Power Electronics
Volume38
Issue number5
DOIs
StatePublished - 1 May 2023
Externally publishedYes

Keywords

  • Demagnetization fault diagnosis
  • disturbance
  • interior permanent magnet (IPM) motor
  • parameter mismatch
  • sliding mode (SM) observer

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