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Investigation of the influence of DC-bus voltage on switched reluctance machines regarding noise and vibrations

par Mollet, Yves ;Chauvicourt, Fabien ;Pelletier, Julien ;Sarrazin, Mathieu;Faria, Cassio C.F.;van der Auweraer, Herman;Gyselinck, Johan
Référence International Conference on Noise and Vibration Engineering (ISMA2018), Leuven, Belgium, 17-19 September 2018
Publication Publié, 2018

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Résumé :

Switched reluctance machines (SRMs) benefit from simple and cheap design and inherent fault tolerance, but still suffer from torque ripple and noise, vibration and harshness (NVH) issues. This paper aims at experimentally investigating the influence of the DC-bus voltage on NVH aspects of a 15 kW 8/6 SRM. Spectrograms of current, vibration and acoustic noise, as well as the evolution of loudness and sharpness are presented for DC-bus-ramp tests. It turns out that a higher DC-bus voltage combined with a hysteresis control leads to the excitation of higher frequencies and therefore to the generation of a sharper noise. This trend is essentially remarkable in hard-chopping mode. Furthermore, the sound becomes also louder as the DC-link voltage increases, probably due to the discrete character of the controller, responsible for overshootsoutside the current-hysteresis band, becoming more important as the switching frequency increases. Finally, similar trends, but highly different values of loudness are found depending on the position of the microphone.