Optimal condition-based maintenance strategy under periodic inspections for traction motor insulations

Jian Zhang, Ji en Ma, Xiao yan Huang, You tong Fang, He Zhang

Research output: Journal PublicationArticlepeer-review

6 Citations (Scopus)


Insulation failure is a crucial failure mode of traction motors. Insulation deteriorates under both fatigue load and shock. This paper focuses on proposing an optimal insulation condition-based maintenance strategy. By combining the information obtained from periodic inspections with historic life information, an integrated model of time-based maintenance and condition-based model is proposed, in which random shocks following Poisson process are also taken into account. In this model we define that insulation has three states: normal state, latent failure state, and functional failure state. Normal state and latent failure state differ in their operating cost, proneness to functional failure, and survival probability under extreme shocks. Preventive maintenance (PM) will be launched if an inspection result exceeds the threshold or if the operating time reaches the critical age. One operating cycle ends as soon as a preventive maintenance or a corrective maintenance is completed. Moreover, an optimization model is established, which takes minimal cost per unit time as the objective, and inspection interval and critical age as the optimization variables. Finally, a numerical example illustrates the analytic results.

Original languageEnglish
Pages (from-to)597-606
Number of pages10
JournalJournal of Zhejiang University: Science A
Issue number8
Publication statusPublished - 12 Aug 2015
Externally publishedYes


  • Condition-based maintenance (CBM)
  • Preventive maintenance (PM)
  • Shock
  • Traction motor insulation

ASJC Scopus subject areas

  • Engineering (all)


Dive into the research topics of 'Optimal condition-based maintenance strategy under periodic inspections for traction motor insulations'. Together they form a unique fingerprint.

Cite this