Optimization Design of Switched Reluctance Motor Based on Response Surface Method

Abstract

Switched reluctance motor (SRM) has been applied in more and more fields. However, the larger torque ripple and lower power density limit its filed. The response surface model (RSM) of optimizing parameters of motor structure is built based on the analysis of the causes of motor torque ripple in order to reduce the vibration and noise of the motor. The multi-group sample points are constructed by using the central composite design (CCD) method, where the torque ripple and efficiency are taken as the optimization objective, and the stator pole, rotor pole arc and turn-off angle are the optimization variables. The sample data are obtained by finite element analysis (FEA), and the RSM equation is built. The effect of all factors on the response face value is analyzed. The relationship between the variables and the target is determined by studying the interaction between the stator/rotor pole arcs and the outer diameter of the rotor. According to the verification formula of response surface, the complex correlation coefficient of torque ripple and efficiency are 0.929 and 0.962; and the lack of fit are 0.059 and 0.056 respectively, which show that the linear relationship is significant between response surface and independent variables. The simulation results show that the torque ripple, average torque and efficiency are 0.608，4.558 and 0.827 when the stator pole arc, rotor pole arc and turn-off angle is 19 deg., 24.4 deg., 22 deg., respectively.