The Suppression of Thrust Ripple and Electromagnetic Vibration in A Double-sided Flux Switching Permanent Magnet Linear Motor by Optimizing the Stator Structure

Abstract

The Double-Sided Flux Switching Permanent Magnet Linear Motor (DLFSPM) is being increasingly and extensively employed in various fields due to its merits of high efficiency and high power density. Nevertheless, the DLFSPM suffer from significant thrust ripple, which exacerbates electromagnetic vibration. To effectively reduce thrust ripple and electromagnetic vibration, this paper aims to significantly enhance its performance by optimizing the stator structure. Firstly, establish the finite element analysis model of the DLFSPM, and based on theoretical methods, derive the electromagnetic thrust equation and the equation of electromagnetic vibration, clarifying the key indicators. Secondly, effective suppression of thrust ripple is achieved by optimizing the radius of the arc fillet in the stator slot. Subsequently, auxiliary slots are introduced on the stator tooth surface, and their optimal dimensions are determined using the finite element model and response surface methodology, with the objective functions of enhancing electromagnetic thrust and reducing thrust ripple. Finally, a comparative analysis is conducted between the comprehensively optimized DLFSPM and the initial structure motor regarding electromagnetic thrust, thrust ripple, and electromagnetic vibration. The simulation results demonstrate that the optimized DLFSPM not only significantly improves electromagnetic thrust but also effectively suppresses thrust ripple and electromagnetic vibration, thereby validating the effectiveness of the optimization method.