By Subrata Karmakar, Surajit Chattopadhyay, Madhuchhanda Mitra, Samarjit Sengupta
This booklet covers the prognosis and evaluation of many of the faults that can ensue in a 3 part induction motor, specifically rotor broken-bar faults, rotor-mass unbalance faults, stator winding faults, unmarried phasing faults and crawling.
Following a quick creation, the second one bankruptcy describes the development and operation of an induction motor, then stories the diversity of recognized motor faults, a few latest innovations for fault research, and a few helpful sign processing recommendations. It comprises an in depth literature survey to set up the learn tendencies in induction motor fault analysis.
Chapters 3 to seven describe the evaluation of every of the 5 fundamental fault forms. within the 3rd bankruptcy the rotor broken-bar fault is mentioned after which equipment of prognosis are defined; (i) analysis of the fault via Radar research of stator present Concordia and (ii) prognosis via envelope research of motor startup present utilizing Hilbert and Wavelet Transforms. In bankruptcy 4, rotor-mass unbalance faults are assessed, and prognosis of either brief and regular nation stator present has been analyzed utilizing diversified ideas. If either rotor broken-bar and rotor-mass unbalance faults ensue at the same time then for id an set of rules is equipped during this bankruptcy. bankruptcy 5 considers stator winding faults and 5 varied research suggestions, bankruptcy six covers prognosis of unmarried phasing faults, and bankruptcy seven describes crawling and its diagnosis.
Finally, bankruptcy 8 specializes in fault review, and offers a precis of the ebook including a dialogue of customers for destiny study on fault diagnosis.
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Extra info for Induction Motor Fault Diagnosis : Approach through Current Signature Analysis
Example text
This phenomenon is called crawling of the induction motor. It is predominant in the squirrel-cage type induction motor. By proper selection of the number of stator and rotor slots, the crawling effect can be reduced. Fig. 2 Causes of Crawling Crawling is caused by the 7th harmonic. The 7th harmonic is introduced due to abnormal magneto motive force. Another reason is high harmonic content in the power supply to the motor. 3 Effects of Crawling Following are the effects of crawling: • Motor under loaded condition will not accelerate up to its normal speed.
To detect failures of induction motor online. Here researchers have worked on broken rotor bar fault, bearing damage, eccentricity, and short-circuit fault. Exact values of harmonics created due to faults, regardless of sampling time, have been ascertained. Researchers have demanded that the exact extent of the defects and the associated frequencies can be identified by FFT analysis. There are some limitations in performance of FFT application.
This analysis is applied on the current signal taken from the motor when it is running in steady state. FFT gives different frequency components present in the signal. 3 Signal Processing Tools for Fault Analysis 37 substantial amount of research work based on FFT [41, 42, 44, 63–66]. Researchers have proved that this tool can be successfully used for rotor fault detection. Menacer et al. [63] have used, in their work, stator current to analyze rotor bar fault of asynchronous motor. In [65] FFT is used by Marcelo et al.
