关键词: 不对称辅助槽, 磁导相位调控, 径向电磁力

Abstract: Aiming at the vibration and noise problem caused by the 2nd-order radial electromagnetic force in permanent magnet motors for air-conditioning compressors, traditional structural designs have the drawbacks of neglecting magnetic flux density phase regulation and limited suppression effect with a single structure. To address these issues, this paper proposes a permeance phase regulation technology based on an asymmetric auxiliary slot structure to suppress the loworder harmonics of radial electromagnetic force. A permeance phase regulation model is established,and the principle of the regulation of harmonic permeance phase by asymmetric auxiliary slot parameters is analytically derived. Furthermore, the
influence of auxiliary slot position offset on the synthesis of target magnetic flux density vectors is clarified. The Through parameter sensitivity analysis,the regulation priorities of slot offset angle,slot width and slot height are determined. A multiobjective optimization algorithm is adopted to obtain the optimal slot structural parameters,so as to maximize the attenuation of radial electromagnetic force under the constraint of limiting the reduction amplitude of average torque. Simulation results show that after optimization, the amplitude of the motor ’ s radial electromagnetic force is reduced by 45. 9%, the torque ripple is decreased by 2. 1%,while the average torque is only reduced by 3%.

Key words: asymmetric auxiliary slot, permeance phase regulation, radial electromagnetic force