Detection of Airgap Eccentricity for Permanent Magnet Synchronous Motors Based on the d-Axis Inductance

Hong Jongman, Sang Bin Lee, Christian Kral, Anton Haumer

Publikation: Beitrag in FachzeitschriftArtikelBegutachtung


The majority of the work performed for detecting eccentricity faults for permanent magnet synchronous motors (PMSM) focus on motor current signature analysis (MCSA), as it provides continuous onlinemonitoring with existing current sensors. However, MCSA cannot be applied under nonstationary conditions and cannot distinguish faults with load torque oscillations, which are limitations for many PMSM drive applications. In this paper, it is shown that the d-axis inductance Ld decreases with an increase in the severity of eccentricity due to the change in the degree of magnetic saturation, and it is proposed as a new fault indicator. The inverter can be used to perform a standstill test automatically whenever the motor is stopped to measure Ld for eccentricity testing independent of load variations or oscillations, which is not possible with MCSA. An finite element and experimental study on a 10-hp PMSM verifies that eccentricity can be detected independent of the load with high sensitivity and reliability.
Seiten (von - bis)2605-2612
FachzeitschriftIEEE Transactions on Power Electronics
PublikationsstatusVeröffentlicht - 2012

Research Field

  • Nicht definiert


  • Airgap eccentricity
  • condition monitoring
  • diagnostics
  • magnetic saturation
  • motor current signature analysis (MCSA)
  • permanent magnet synchronous motor (PMSM).


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