Abstract

SUMMARYIn this paper, impacts of the unbalanced voltage supply conditions and inverter harmonics on accurate broken bar fault diagnosis in induction motors are investigated in detail. It is presented that amplitude of the side‐band components at frequencies (1 ± 2ks)fs as a well‐known index is not competent for accurate broken bar fault detection in induction motors in the presence of unbalanced voltage supply. Thus, the above mentioned frequency pattern is modified for precise broken bar fault recognition in induction motors under unbalanced voltage supply conditions. Amplitude of the side‐band components at frequencies [k/p(1 − s) ± s]fs is proposed as a proper index for precise broken bar fault identification in the aforementioned conditions. In order to evaluate proposed index competency, effects of the load variation and unbalanced supply deviation on the proposed index are analyzed. Furthermore, electromotive force of the healthy and faulty induction motors has been calculated, and side‐band components at frequencies [k/p(1 − s) ± s]fs are extracted from the electromotive force spectra which is nominated as a new technique for precise broken bar fault recognition in induction motors. Comparison of simulation and experimental results verifies the method's ability to detect broken bars with an unbalanced voltage supply and inverter harmonics. Copyright © 2011 John Wiley & Sons, Ltd.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.