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Investigation of the Influence of the Current-Hysteresis Bandwidth on Noise and Vibrations of Switched Reluctance Machines

par Mollet, Yves ;Sarrazin, Mathieu;van der Auweraer, Herman;Gyselinck, Johan
Référence 23rd International Congress on Sound & Vibration (ICSV 2016), 10-14 July 2016, Ed. 23
Publication Publié, 2016

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Résumé :

The development of power converters has permitted the rise of switched reluctance machines(SRMs), due to their simple and cheap design and of their inherent fault tolerance. However,those machines suffer from torque ripple and noise and vibration issues, which constitute an obstacleto the extension of their application domain. This paper presents the influence of thebandwidth of a current-hysteresis controller on an 8/6 SRM in terms of noise, vibration andharshness. Simulations in AMESim environment and measurements on a 15 kW test bench areperformed in transient state, based on continuous variation of the hysteresis bandwidth. Phasecurrents, acoustic noise and radial vibrations are measured without and with load, allowing forcomparison of hysteresis-band-frequency plots. This transient state approach enables showingthe evolution of a part of the frequency components with hysteresis bandwidth and distinguishingthem from other components linked to speed or to structural behaviour of the motor. Resultsshow that the current chopping by means of a hysteresis controller generates broadband frequenciesin the phase currents that also appear in the vibration and sound pressure wave measurements.As the bandwidth increases, switching-related components are shifted towards lowerfrequencies, resulting in a higher excitation of the main resonance modes of the machine. Due tothe higher current ripple in the case of hard chopping mode, the influence of the bandwidth is ingeneral more important than in soft chopping mode. However, for the same bandwidth the rippleoccurs at much lower frequencies in the latter case and therefore more attention has to bepaid to possible interaction with the resonance frequencies.