Abstract: The design of fractional slot centralized winding brings higher efficiency and smaller size to the permanent magnet synchronous generator, but also makes the vibration and noise problem of the motor more prominent. In order to determine the main sources of electromagnetic vibration noise of permanent magnet synchronous generators, the paper started from the twodimensional airgap magnetic field of permanent magnet synchronous generators, obtained the expressions of radial and tangential electromagnetic force based on Maxwell tensor method, and analyzed the harmonic sources and harmonic characteristics of electromagnetic force wave. The paper established a multiphysics finite element simulation model of the electromagneticstructureacoustic field of the permanent magnet synchronous generator, and proposed to compare and analyze the contribution of the radial force and tangential force to the vibration noise caused by the radial force and tangential force by loading the radial force and tangential force separately. The results of the study provide a reference for the analysis and optimization of the electromagnetic noise of permanent magnet synchronous motor.

Key words: permanent magnet synchronous generators；fractional slot centralized winding；radial electromagnetic force；tangential electromagnetic force；electromagnetic vibration noise