关键词: 开关磁阻电机, 气隙偏心, 电磁特性, 多目标优化

Abstract:

The airgap eccentricity of in-wheel motor is easily caused by external disturbances such as road excitation and driving behavior,which leads to the imbalance of radial electromagnetic force and affects the output performance of the motor.Aiming at the above problems,the electromagnetic characteristics of in-wheel motor under airgap eccentricity are analyzed,and an optimization method of structural parameters for the switched reluctance motor based on genetic algorithm is proposed to weaken the radial electromagnetic force.Taking an 8/6 four-phase switched reluctance motor as the research object, the effects of different airgap eccentricity,conduction phase relative to the motor inductance,flux,torque and radial electromagnetic force are studied.The transient simulation of switched reluctance motor is carried out with the asymmetric half-bridge main circuit to obtain the response characteristics of motor torque and radial electromagnetic force under the static and dynamic eccentric conditions.Finally,the structural parameters of switched reluctance motor are optimized with the aim of suppressing the radial electromagnetic force for switched reluctance motor.The results show that the radial electromagnetic force decreases by 13.64%,the fluctuation of electromagnetic force decreases by 34.37%,and the torque decreases by 0.20% after optimization.Compared with the small torque sacrifice,the radial electromagnetic force and electromagnetic force fluctuation are effectively suppressed,which shows the effectiveness of the proposed optimization method.