Sensitivity Analysis of Geometrical Parameters of a Switched Reluctance Motor with Modified Pole Shapes

Abstract

-A major problem in Switched Reluctance Motor (SRM) is torque ripple, which causes undesirable acoustic noise and vibration. This work focuses on reducing the undesirable torque ripple in SRM by modifying stator and rotor geometry. This paper presents a comparative study on torque ripple minimization in SRM with modified pole shapes such as stator pole taper, stator pole face with non-uniform air gap and pole shoe attached to rotor pole. Further this paper presents a detailed sensitivity analysis of the effect of different geometrical parameters that alter the pole face shapes on the performance of SRM. The analysis is performed using finite-element method considering average torque and torque ripple as performance parameters. Based on the analysis, a design combining stator pole taper with non-uniform air gap is proposed to improve the torque characteristics of SRM. The dynamic characteristics of the proposed design are simulated and the results show satisfactory reduction in torque ripple.

The effect of a single‐sided pole shoe and slot on reducing torque ripple in a switched reluctance motor

“…It has a wide speed range and low torque ripple. To decrease the torque ripple and increase the average torque, a tapered stator pole is described in the literature 11 with small reluctance and large inductance near the unaligned position. It shows that the torque ripple can be reduced by adding the rotor pole shoes and the average torque will barely decrease.…”

Design and optimisation of an In‐wheel switched reluctance motor for electric vehicles

“…In [17], the sensitivity of the stator and rotor pole arcs was studied to determine optimal pole arc configuration to minimise torque ripple. Moreover, the sensitivity of geometrical parameters on the performance of SRMs has also been described in the literature [11, 18, 19]. However, those studies focused on the effect or sensitivity analysis of common SRMs instead of In‐wheel SRMs with outer rotor, and the effect principle of In‐wheel SRMs with outer rotor is completely different from that of common SRMs.…”

Torque ripple minimization of Switched Reluctance Motors using speed signal based phase current profiling

“…Optimization also includes several control parameters along with design parameters [11,12]. As stator and rotor poles have a direct impact on the inductance profile which can be used for ripple reduction, these are the most used approaches for design based ripple minimization [13][14][15][16][17][18]. In [13], optimal machine design was obtained for a given current waveform.…”

“…The projected pole arc at the unaligned position provides wider torque-current-position characteristics curves, which causes reduced torque ripple during overlapping. In [16], two different stator shapes are analyzed for ripple reduction performance. One shape is the taper type structure of the stator.…”

“…16 Speed at 500 rpm with conventional controller (SRM-2). Speed at 500 rpm with conventional controller (SRM-2).…”