为了研究不同转子拓扑结构对8极48槽内置式永磁同步电机（IPMSM）的电磁性能和噪声性能的影响，分别建立了单层无隔磁桥、单层有隔磁桥、双层无隔磁桥以及双层有隔磁桥转子拓扑结构的内置式永磁同步电机的有限元模型。除转子拓扑结构以外，四种电机的定子拓扑结构、永磁体使用量等其它条件完全相同。首先，对电机电磁性能和噪声性能进行相关的理论分析。其次，建立四种电机的有限元模型，对四种电机的凸极率、输出转矩、转矩脉动以及空载反电势谐波畸变率等电磁性能进行比较分析，并对四种电机进行模态分析。最后，比较了四种电机的振动响应和噪声特性。结果表明，双层有隔磁桥转子结构的内置式永磁同步电机电磁性能最好，并且其噪声削弱效果也最好。

In order to investigate the effects of different rotor topologies on the electromagnetic and noise performance of 8-pole 48-slot interior permanent magnet synchronous motor (IPMSM), finite element models of interior permanent magnet synchronous motors with single-layer non magnetic bridge, singlelayer magnetic bridge, double-layer non magnetic bridge, and double-layer magnetic bridge rotor topologies are established. Except for the rotor topology, the stator topology, permanent magnet usage, and other conditions of the four types of motors are completely the same. Firstly, the electromagnetic performance and noise performance of the motor are analyzed theoretically. Secondly, the finite element models of four kinds of motors are established, and the electromagnetic performances of the four kinds of motors, such as salient pole rate, output torque, torque ripple and no-load back EMF harmonic distortion rate are compared and analyzed, and the modal analysis of the four kinds of motors is carried out. Finally, the vibration response and noise characteristics of the four kinds of motors are compared. The results show that the interior permanent magnet synchronous motor with a double-layer rotor structure with a magnetic isolation bridge has the best electromagnetic performance, and its noise reduction effect is also the best.