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.