Finite Element Method Based Design and Analysis of a Low Torque Ripple Double-Stator Switched Reluctance Motor

Abstract

Double-stator switched reluctance motors (DSSRMs) acquire attention because of their high torque/power generating capability compared to conventional and segmented rotor switched reluctance motors. One of the main limiting performance indices of such motors for industrial applications is its high torque ripple. This paper proposes a 12/10/12 pole DSSRM with an angular shift of half of the stroke angle between inner and outer stators. The respective phase windings of the inner and outer stators are parallelly excited with the same phase angle shift to reduce the torque ripple. Each rotor segment is constructed with a pair of half rotor segments that are isolated from each other through the insertion of a non-magnetic isolator between them. Firstly, the design hypothesis for a low torque ripple DSSRM has been presented; thereafter, some geometric modifications have been suggested and investigated to obtain a nearby response in the proposed DSSRM. The calculation of the width of the non-magnetic isolator, modification in the pole height of outer stator and modification in the arc angles of rotor segments/stator poles are discussed in detail. The effectiveness of the proposed motor is investigated through a 2D finite-element modelling and simulation in ANSYS/MAXWELL software. Simulation results show that the torque ripple is significantly reduced by 74.9% in the proposed DSSRM compared to the baseline DSSRM.

Analysis of Skewing Effects on Radial Force for Different Topologies of Switched Reluctance Machines: 6/4 SRM, 8/6 SRM, and 12/8 SRM

“…An electromagnetic FEA method is used to compute the acceleration, deformation, and velocity of the vibrating surface at a selected point on the outer surface of the machine. In (Gupta et al 2021), the authors investigated the mitigation of the torque ripple by varying the SRM geometric parameters based on the FEA results. In (Ganji et al 2015), a parametric electromagnetic model was developed for a Switched Reluctance Generator (SRG) with FEA, which could be considered appropriate for the accurate analysis and optimal design.…”

Design Improvements in Double-stator Axial Flux Switched Reluctance Motor for Smoother Torque Profile

“…This paper presents the design procedure of 8\6\8 DSAFSRM with a multilevel air gap and pole shoe to mitigate the torque ripple. Slot fill factor (S.F.F) is taken as 0.43 [30][31][32] and average current density taken as 12 A/sq mm. As our both stators at the outer stator are exposed to environment this could be the permissible limit for thermal consideration.…”