A remote and sensorless stator winding thermal protection scheme for line-connected AC machines

Sang Bin Lee, Thomas G. Habetler

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)


An advanced remote and sensorless thermal protection technique for line-connected AC machines is proposed in this paper. The proposed technique includes an algorithm for detecting abnormal cooling conditions due to reduced motor cooling ability in addition to a stator resistance (Rs)-based stator temperature (Ts) estimation scheme. The motor cooling ability monitoring algorithm can be implemented using the Rs estimates of an existing dc injection-based Rs estimation scheme without additional hardware or parameter information. In addition, the influence of the fuse, circuit breaker, and cable resistances on the Rs estimate is investigated, and methods for compensation are suggested for improving the accuracy of the Rs estimate, and therefore, the reliability of Ts monitoring. Experimental results under various abnormal cooling conditions verify that the reduced cooling ability of the motor can be reliably detected and that it can be used in addition to the Ts estimate for complete motor thermal protection.

Original languageEnglish
Pages (from-to)1517-1524
Number of pages8
JournalConference Record - IAS Annual Meeting (IEEE Industry Applications Society)
Publication statusPublished - 2002
Externally publishedYes
Event37th IAS Annual Meeting and World Conference on Industrial applications of Electrical Energy - Pittsburgh, PA, United States
Duration: 2002 Oct 132002 Oct 18


  • AC machines
  • Abnormal cooling situations
  • Condition monitoring
  • Diagnostics
  • Reduced motor cooling ability
  • Stator resistance estimation
  • Thermal protection

ASJC Scopus subject areas

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


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