Application of Spectral and Wavelet Analysis of Stator Current to Detect Angular Misalignment in PMSM Drive Systems.
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Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland
Marcin Wolkiewicz   

Wroclaw University of Science and Technology
Power Electronics and Drives 2021;6 (41):42–60
This paper deals with the selected methods of detecting angular misalignment in drive systems with a permanent magnet synchronous motor, which are based on the analysis of the stator phase current signal, as well as their experimental verification and comparison. The proposed and compared methods are spectral analysis and wave-let analysis of the stator current, stator current envelope, stator current space vector module. Furthermore, the in-fluence of power supply frequency and load torque on the performance of the proposed diagnostic methods is al-so discussed. The experimental tests were carried out for an undamaged motor and for 2 levels of angular misa-lignment. The article discusses exactly what damage symptoms can be extracted with each of the methods. In the case of spectral analyses, it was demonstrated which multiplicities of the failure frequency are the most sensitive to misalignment and the least to changes in motor operating condition, which may be considered novel in the case of drive systems with permanent magnet motors. It has been also proven that DWT of the envelope and monitoring of the value of the relevant components allows the detection of misalignment with the availability of measuring only one in various motor operating conditions.