Prediction of Radial Vibration in Switched Reluctance Machines

Experimental noise and vibration analysis of switched reluctance machines comparison of soft and hard chopping in transient conditions

“…If the flux (and thus the current) are non-zero during commutation (e.g. at turnoff), the generated vibrations are much more important [8,12]. The torque value also has a significant influence on both loudness and tonality and has a more limited effect on its sharpness [6].…”

“…Furthermore, these pulsating forces excite the natural modes of the stator [6,8,12] and of other components of the motor or of its environment such as, if present, the liquid cooling jacket. Certain modes can be more solicited than others depending on the number of poles in the stator [6,9].…”

“…Thanks to the simple stator construction (with concentrated winding) and the absence of magnets and windings in the rotor SRMs are particularly cheap [1][2][4][5][6][7][8], robust [2,4,8,9] and suited for severe environments [10] or high-speed applications [3]. SRMs also offer a high torque-volume ratio [4,9] and have an inherent electrical fault-tolerance due to a negligible magnetic coupling between the phases [2,5,7].…”

“…However, SRMs have to cope with higher torque ripple [4-5, 7, 11] and acoustic noise and vibration [5][6][7][8][11][12] than conventional induction or permanent-magnet synchronous machines. These drawbacks keep these motors from being extensively used so far, especially in noise-sensitive applications (such as automotive).…”

“…In this context, the sound quality has also to be investigated: on the one hand, tonal or narrowband and on the other hand, sharp sounds (with great high-frequency content) have especially to be avoided [6]. Possible solutions may consist of control optimization or even a new converter topology [8].…”