This book covers the diagnosis and assessment of the various faults
which can occur in a three phase induction motor, namely rotor
broken-bar faults, rotor-mass unbalance faults, stator winding faults,
single phasing faults and crawling.
Following a brief introduction, the second chapter describes the
construction and operation of an induction motor, then reviews the range
of known motor faults, some existing techniques for fault analysis, and
some useful signal processing techniques. It includes an extensive
literature survey to establish the research trends in induction motor
fault analysis.
Chapters three to seven describe the assessment of each of the five
primary fault types. In the third chapter the rotor broken-bar fault is
discussed and then two methods of diagnosis are described; (i) diagnosis
of the fault through Radar analysis of stator current Concordia and (ii)
diagnosis through envelope analysis of motor startup current using
Hilbert and Wavelet Transforms. In chapter four, rotor-mass unbalance
faults are assessed, and diagnosis of both transient and steady state
stator current has been analyzed using different techniques. If both
rotor broken-bar and rotor-mass unbalance faults occur simultaneously
then for identification an algorithm is provided in this chapter.
Chapter five considers stator winding faults and five different analysis
techniques, chapter six covers diagnosis of single phasing faults, and
chapter seven describes crawling and its diagnosis.
Finally, chapter eight focuses on fault assessment, and presents a
summary of the book together with a discussion of prospects for future
research on fault diagnosis.
