In current researches on reducing torque ripple of interior permanent magnet synchronous motor (IPMSM) by asymmetric method, there is no detailed study on the influence on electromagnetic vibration noise of the motor. For this reason, taking a 37 kW IPMSM as the research object, the electromagnetic field finite element model and the vibration noise coupling model of the original motor and the motor with asymmetric magnetic barrier structure are established. The effects of the asymmetric magnetic barrier structure on the vibration noise of the motor are compared and analyzed. The order and frequency characteristics of the radial electromagnetic force wave of the permanent magnet motor are analyzed theoretically, and the radial electromagnetic force wave at the air gap is decomposed by using the finite element method and two-dimensional Fourier decomposition method. The finite element model of the stator structure is established and its modal analysis is carried out. Then the vibration noise coupling model is built on the simulation platform to obtain the vibration response and electromagnetic noise of the motor stator. The results show that, although the design method of asymmetric magnetic barrier can reduce the torque ripple of the motor and does not sacrifice the output torque of the motor, it will generate other frequency multiplied electromagnetic force and increase the vibration response of the corresponding frequency points, and deteriorate the vibration noise of the motor, which should be considered comprehensively in the design.