Permanent magnet synchronous motors (PMSMs) are increasingly required to achieve higher energy efficiency and lower noise in industrial and agricultural applications. To further enhance the operational efficiency and reduce the vibration and noise of the motor

this paper investigates an interior permanent magnet synchronous motor based on a multi-physics finite element analysis platform and a PMSM experimental platform. Leveraging the structural characteristics and magnetic circuit of the motor’s q-axis slotted rotor

a novel rotor structure with a magnetic shield hole is proposed. This structure can reduce magnetic leakage and enhance the main magnetic flux

which is conducive to reducing losses

improving efficiency

and lowering the radial electromagnetic force density amplitude

thereby reducing vibration and noise. For this structure

a multi-objective optimization is conducted by using modern particle swarm optimization algorithms

with the electromagnetic force density amplitude

the amount of permanent magnet used

output torque

and torque ripple as optimization objectives. Finally

the efficiency and vibration-noise performance of the motor before and after optimization are compared and analyzed. A prototype with optimized parameters is manufactured

and no-load

load

and vibration-noise experiments are conducted. The experimental results verifies the effectiveness of the novel rotor structure of the motor and the correctness of the optimization analysis.