Comprehensive Monitoring of FieldWinding Short Circuits for Salient Pole Synchronous Motors

Jangho Yun, Sanguk Park, Chanseung Yang, Yonghyun Park, Sang Bin Lee, Greg C. Stone, Mladen Sasic

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Interturn insulation failure in the field winding of synchronous motors is a common problem that can lead to degradation in performance and accelerated wear of motor components. Existing off-line tests for detecting this fault are known to be unreliable and inconvenient to perform, as they require motor disassembly. On-line monitoring based on airgap flux monitoring has been proven to be successful, but could lack sensitivity for cases where the number of turns per pole is large. In addition, field winding turn shorts can be intermittent depending on the centrifugal force and could be unobservable at standstill or under steady state operation. Therefore, monitoring of the turn faults under standstill and starting conditions with high sensitivity and without motor disassembly is desirable. In this paper, the detection of field winding short circuits for salient pole synchronous motors based on an airgap search coil under the starting transient, and new methods for standstill testing without motor disassembly are proposed. 2D FE analysis and experimental testing on a 30 kW motor are given to verify the claims made. It is shown that the proposed set of tests can provide sensitive and reliable detection of field winding short circuits under standstill and starting conditions.

Original languageEnglish
JournalIEEE Transactions on Energy Conversion
Publication statusAccepted/In press - 2019 Jan 1


  • Airgap Flux
  • Circuit faults
  • Field Winding
  • Induction motors
  • Monitoring
  • Off-line Testing
  • Rotors
  • Salient Pole Rotor
  • Search Coil
  • Starting
  • Stator windings
  • Synchronous Motor
  • Synchronous motors
  • Windings

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


Dive into the research topics of 'Comprehensive Monitoring of FieldWinding Short Circuits for Salient Pole Synchronous Motors'. Together they form a unique fingerprint.

Cite this