Having discussed the fundamentals of induction motors with broken bars fault and explained how the breakage affects the motor electromagnetic and mechanical properties, the diagnosis approaches and the fault indices are going to be discussed in detail with the purpose of introducing a comprehensive diagnosis process. There are also other specifications of the diagnosis approaches which will be introduced and explained in this chapter.

Chapter Contents:

• 8.1 Introduction
• 8.2 Motor current signature analysis (MCSA)
• 8.3 Pendulous oscillation
• 8.4 Virtual current technique
• 8.5 Air gap flux density
• 8.6 Speed fluctuations
• 8.7 Gyration radius
• 8.8 Time-domain analysis of nonadjacent broken bars fault
• 8.9 Spectrum of motor current
• 8.10 Effect of closed loops on faulty motor signals
• 8.11 Analytical analysis of the effect of speed variation on sideband components
• 8.12 Motor power spectrum
• 8.13 Additional frequency-domain fault indices
• 8.14 Motor transient operation
• 8.15 Application of wavelet transform to the diagnosis of broken bars fault
• 8.16 Application of Hilbert-Huang transform to the diagnosis of broken bars fault
• 8.17 Loss characterization of induction motors with broken bars fault
• 8.18 Conclusion
• References

Inspec keywords: induction motors; fault diagnosis; fracture

Other keywords: fault diagnosis; motor mechanical properties; induction motors; broken bars fault; breakage affects; motor electromagnetic properties

Subjects: Asynchronous machines