Importance of maintenance; cost considerations; Classification of maintenance: Breakdown, Preventive, Maintenance planning and scheduling fundamentals, Review of to DC and AC rotating machines - structure and working principles; Materials, strength, and temperature considerations; Common failure modes and degradation mechanisms; Insulation ageing and thermal stress, Concept of machine reliability and maintainability; Failure rate and life cycle models; Reliability-centered maintenance (RCM) approach; Typical reliability data for rotating machines, Fundamentals of signal processing, Spectral analysis and higher-order spectral techniques, Correlation and wavelet analysis for fault detection, Vibration and temperature measurement systems, Signal conditioning and data acquisition, Frequency of data acquisition, Online monitoring techniques: Temperature, vibration, current, flux and partial discharge monitoring; Offline methods: Insulation resistance, polarization index, surge comparison tests, etc. Data interpretation and health assessment, Case Studies based on diagnosis of broken bar faults, eccentricity faults; interturn short-circuit faults in induction motors, Interpretation of real-time data and signal trends, Condition-based and asset management systems, Use of artificial intelligence and machine learning in predictive maintenance, cost optimization in maintenance, condition monitoring of electric drives, maintenance of renewable energy systems (wind turbines, solar generators), Maintenance of VFD driven motors.
Suggested Books:
- Condition Monitoring of Rotating Electrical Machines by Peter Tavner, Li Ran and Christopher Crabtree, IET Publication.
- Fault Diagnosis of Induction Motors by Jawad Faiz, Vahid Ghorbanian and Gojko Joksimović, IET Publication
- Electric Machines: Modeling, Condition Monitoring, and Fault Diagnosis by Hamid A. Toliyat, Subhasis Nandi, Seungdeog Choi, Homayoun Meshgin-Kelk, CRC Press
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