【摘要】 针对内置式永磁同步电机的永磁体退磁问题，提出一种新结构反凸极永磁同步电机。本设计利用增大永磁体夹角的方式解决磁密偏大的问题。同时分别在转子的永磁体侧和交轴侧设置弧形磁障以减小电机转子两极间漏磁，提升电机电磁性能。通过参数化分析得到对弧形磁障的相关参数对电机的电磁性能的影响，使结构优化的效果更明显。通过仿真对比得到，结构优化后电机的永磁体夹角间的磁密为1.2 T,小于优化前的1.6 T;空载反电动势基波高于优化前电机，除7次谐波外其余各次谐波均小于优化前电机；转矩脉动显著小于优化前的电机，并显现出更好的反凸极特性。最后，在实验室条件下搭建一台1.1 kW的样机进行实验，测得其交直轴电感为80.94 mH和94.16 mH,空载反电动势谐波畸变率为10.64%,验证其可行性与优越性。更多还原

【Abstract】 Aiming at the demagnetization problem of permanent magnets in interior permanent magnet synchronous motors, a new structure of negative-saliency pole permanent magnet synchronous motor was proposed. This design solves the problem of excessive magnetic flux density by increasing the angle of the permanent magnets. Meanwhile, arc-shaped magnetic barriers were set on the permanent magnet side and the quadrature axis side of the rotor to reduce the leakage flux between the two poles of the rotor and improve the electromagnetic performance of the motor. Through parametric analysis, the influence of the relevant parameters of the arc-shaped magnetic barriers on the electromagnetic performance of the motor was obtained, making the effect of structural optimization more obvious. Through simulation comparison, it is found that after the structure was optimized, the magnetic flux density between the permanent magnet angles of the motor is 1.2 T, which is less than 1.6 T before optimization; the fundamental no-load back electromotive force is higher than that of the motor before optimization, and all harmonics except the 7th harmonic are less than those of the motor before optimization; the torque ripple is significantly smaller than that of the motor before optimization, and it shows better negative-saliency pole characteristics. Finally, a 1.1 kW prototype was built in the laboratory for experiments. The measured direct and quadrature axis inductances are 94.16 mH and 80.94 mH respectively, and the harmonic distortion rate of the no-load back electromotive force is 10.64%, verifying its feasibility and superiority.更多还原