Abstract: In view of the electromagnetic vibration and noise analysis of permanent magnet motor with Halbach

structure at rated power，the analytical expression of radial force wave of permanent magnet motor was established，and two kinds of main force waves which cause vibration and noise were analyzed. The main noise sources of the motor were determined by analytic method. In order to characterize the motor characteristics of the Halbach structure motor and its vibration and noise performance，two motors of Halbach structure and common radial magnetization structure were compared. For these two motors，the analysis of the air gap flux density and the comparison of vibration and noise were carried out. The comparative analysis results show that the permanent magnet motor rotor yoke of Halbach structure is thinner，lighter，and the air gap flux density is more sinusoidal. However，due to the different third harmonic content of radial air gap flux density，the vibration acceleration amplitude under main excitation frequency of Halbach permanent magnet motor are 9.56% higher than those of traditional radial magnetization permanent magnet motor，and the total sound pressure level is 0.65 dB higher. The analysis results provide a research foundation for the selection and design of the motor of the integrated pump-mechanical equipment.

     Key words: Halbach structure magnetization；traditional radial magnetization；permanent magnet synchronous

motor；vibration；noise