Rotor Magnet Fault Analysis in Permanent Magnet AC Machines Under Load Conditions - All Electric Transportation Systems

Adil Usman, Bharat Singh Rajpurohit

Research output: Contribution to conferencePaper

Abstract

This paper studies the performance of a Permanent Magnet (PM) alternating-current (AC) machine when subjected to faults under load conditions. The effect of varying load torques, and unbalances are found to be potential causes of rotor faults, inducing physical magnet defects or broken rotor-PMs. The consequent and immediate impact on the machine quantities is observed through anomalous change in torque-speed characteristics and other vital signatures such as machine back-EMF/flux and motor current signatures (MCS). The present research study develops and illustrates a method to diagnose physical magnet defects (fault) in PMAC machines by estimating the machine torque/back-EMF constant, Ke. The constant Ke is a measure of magnet strength exhibiting the health of rotor PMs, indicative of faults. Advanced research studies and investigations are carried out to establish motor approximations and signature-based analysis as significant viable tools for diagnosing machine faults even under load conditions.
Original languageAmerican English
Number of pages8
DOIs
StatePublished - 2024
Event2023 IEEE Industry Applications Society Annual Meeting (IAS) - Nashville, Tennessee
Duration: 29 Oct 20232 Nov 2023

Conference

Conference2023 IEEE Industry Applications Society Annual Meeting (IAS)
CityNashville, Tennessee
Period29/10/232/11/23

NREL Publication Number

  • NREL/CP-5400-89322

Keywords

  • alternating current
  • component
  • fault diagnosis
  • motor current signature analysis
  • permanent magnet
  • state of health

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