Abstract
This paper presents a multi-objective optimal rotor design for an interior permanent magnet synchronous motor (IPMSM) based on finite element analysis. Due to the importance of torque characteristic in electromagnetic design of IPMSMs, the main efforts of this study are focused on finding a proper trade-off for its torque profile challenges. In this regard, in order to attain high average torque and low torque ripple, the influence of several key factors, such as the permanent magnet (PM) arrangements, PM positions and PM sizes, are examined. Subsequently, according to the outcomes of the performed sensitivity analysis, the appropriate variation interval of the parameters as well as their initial values is determined. Employing such a deterministic optimization algorithm, which does not need large sample points, minimizes the finite element computational cost and leads to accelerate the convergence process. The two-dimensional finite element model (FEM) of an IPMSM is used to perform a sensitivity analysis and establish a multi-objective FEM-based optimization.
Highlights
Due to the rapid development and implementation of Nd-Fe-B magnets, interior permanent magnet synchronous motor (IPMSM) play a significant role in many industrial applications [1,2]
IPMSMs provide a high torque density, high reluctance torque, appropriate flux weakening capability, high efficiency and simple controllability [3,4,5]. In some cases, such as traction applications in which IPMSMs are promising electric machines, high torque density and low torque ripple because of the influence on the comfort and the stability of vehicle play a vital role; a trade-off between the average torque and torque ripple should be taken into consideration [6,7,8,9,10]
By comparing the variation intervals of the average torque and torque ripple obtained from the sensitivity analysis with the results attained from the optimization method, we can conclude that achieving an average torque of 1093 Nm and a torque ripple of 5.82%
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. In [19], a multi-objective stratified optimization strategy is proposed, where five optimization objectives are divided into two levels consisting of priority level 1 (output torque, PM cost) and level 2 (cogging torque, torque ripple, efficiency); though an important design parameter, PM’s position relative to the rotor center has been ignored. In [21], an effective multilevel optimization strategy using the Pearson correlation coefficient analysis and cross-factor variance analysis for high-dimensional multi-objective optimization design of an IPMSM was proposed; only the V structure has been considered and PMs position relative to rotor center has been neglected. By using the finite element method, we investigated the influence of various design parameters, such as magnet width and thickness, the position of the central magnet relative to the rotor center, side magnet width and thickness and side magnet angle on the average torque and torque ripple. Using the optimization toolbox of ANSYS-Maxwell and the BFGS method, which does not need huge finite element analysis attempt, the optimization problem was run
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