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

• Published in: Journal of Zhejiang University. A. Science Vol. 16; no. 8; pp. 597 - 606
• Main Authors: Zhang, Jian, Ma, Ji-en, Huang, Xiao-yan, Fang, You-tong, Zhang, He
• Format: Journal Article
• Language: English
• Published: Hangzhou Zhejiang University Press 01.08.2015
• Subjects: Civil Engineering; Classical and Continuum Physics; Engineering; Industrial Chemistry/Chemical Engineering; Mechanical Engineering; Shock; Preventive maintenance (PM); 视情维修; 冲击; 预防性维修; 牵引电机绝缘; Condition-based maintenance (CBM); TH17; Traction motor insulation
• ISSN: 1673-565X; 1862-1775; 1862-1775
• DOI: 10.1631/jzus.A1400311

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.