Cogging Torque Minimization of Surface-Mounted Permanent Magnet Synchronous Motor Based on RSM and NSGA-II

Abstract

A high-end permanent magnet (PM) synchronous motor’s cogging torque is a significant performance measure (PMSM). During the running of the motor, excessive cogging torque will amplify noise and vibration. Therefore, the cogging torque must be taken into account while optimizing the design of motors with precise motion control. In this research, we proposed a local optimization-seeking approach (RSM+NSGA-II-LR) based on Response Surface Methodology (RSM) and Non-Dominated Sorting Genetic Algorithm-II (NSGA-II), which reduced the cogging torque of a permanent magnet synchronous motor (SPMSM). To reduce the complexity of optimization and increase its efficiency, the sensitivity analysis method was utilized to identify the structural parameters that had a significant impact on the torque performance. Second, RSM was utilized to fit the functional relationship between the structural parameters and each optimization objective, and NSGA-II was integrated to provide the Pareto solution for each optimization objective. The solution with a greater average torque than the initial motor and the lowest cogging torque was chosen, and a new finite element model (FEM) was created. On the basis of the sensitivity analysis, the structural factors that had the highest influence on the cogging torque were selected, and the RSM is utilized for local optimization to lower the cogging torque as much as feasible. The numerical results demonstrated that the optimization strategy presented in this study effectively reduced the cogging torque of the motor without diminishing the motor’s average torque or increasing its torque ripple.

Research on Contact Anchoring Theory and Contact Optimization of Underwater Pipeline Recovery Tools

“…The relationship between the volumetric wear amount, W v , the indentation depth, h, and the sliding distance, S, is shown in Equation (21).…”

“…In this paper, the response surface model (RSM) method [21,22] was used to evaluate the sensitivity. In light of the foregoing results, Figure 13a,b depict the response surface model based on the effect of the contactor fillet R and contactor cylindrical diameter D on the contactor indentation depth h and the relative sliding distance S between the contactor and the pipe.…”

“…In this paper, the response surface model (RSM) method [21,22] was used to evaluate the sensitivity. In light of the foregoing results, Figure 13a As can be seen from Figure 13a,b, the value of the depth h of the contact body pressed into the pipeline decreases and then increases, and the value of the relative slip distance S between the contact body and the inner wall of the pipeline gradually decreases as the round angle R of the contact body increases.…”

An Analytical Method for Determining Flux Density in Surface-Mounted Permanent Magnet Machines with Unequal Magnetic Poles

“…[1][2][3][4][5][6]. At present, people pay much attention to the weakening of the cogging torque, to the reduction in torque ripple, and to the suppression of the vibration or noise of the SMPMM [7][8][9][10][11]. These are required in order to firstly obtain the magnetic flux density of the SMPMM.…”