On-line Detection of Rotor Eccentricity and Demagnetization Faults in PMSMs based on Hall-effect Field Sensor Measurements

Yonghyun Park, Daniel Fernandez, Sang Bin Lee, Doosoo Hyun, Myung Jeong, Suneel Kumar Kommuri, Changhee Cho, David Diaz, Fernando Briz

Research output: Contribution to journalArticle

9 Citations (Scopus)


Rotor eccentricity and local demagnetization in permanent magnet synchronous motors (PMSMs) increases unbalanced magnetic pull and motor vibration resulting in accelerated aging of motor components. If the asymmetry in the rotor remains undetected, it can increase in severity, and increase the risk of stator-rotor contact, which causes forced outage of the motor and driven process. Detection of PMSM rotor asymmetry currently relies on off-line testing and on-line vibration/current spectrum analysis. However, they are inconvenient or cannot provide reliable detection as they are influenced by other mechanical non-idealities in the motor or load. In this paper, the feasibility of using the signals from analog Hall-effect field sensors for detecting eccentricity and local demagnetization is investigated. It is shown that Hall sensors present in machines for motion control can be used for measuring the variation in the flux inside the motor due to rotor magnetic asymmetry with minimal or no hardware modifications. 3-dimensional (3D) finite element analysis (FEA) and experimental results performed on an interior PMSM (IPMSM) show that the proposed method can provide sensitive and reliable detection of dynamic/mixed eccentricity and local PM demagnetization.

Original languageEnglish
JournalIEEE Transactions on Industry Applications
Publication statusAccepted/In press - 2018 Jan 1


  • Condition Monitoring
  • Demagnetization
  • Demagnetization
  • Finite Element Analysis
  • Hall Effect Field Sensor
  • Monitoring
  • Permanent Magnet Synchronous Motor
  • Rotor Eccentricity
  • Rotors
  • Stators
  • Temperature measurement
  • Three-dimensional displays
  • Trajectory

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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