关键词: 永磁同步电动机, 整数槽, 解析法, 谐波分析, 电磁力波, 有限元法

Abstract: A modern textile integer slot permanent magnet synchronous motor (PMSM) with 48 slots and 8 poles was analyzed in the magnetic field harmonic theory and radial force wave. The synthetic air-gap magnetic field, the stator armature winding magnetic field and the rotor permanent magnet magnetic field were performed by the analytical method in the harmonic analysis. Using the combination of analytical model and finite element model, the numbers of radial electromagnetic force wave were compared and analyzed, also a Python-based preprocessor was designed. The finite element method was used to analyze the amplitude and frequency of the electromagnetic force wave in the case of complete de-analysis. Through the further simulation on the spatial and time distribution of the radial electromagnetic force wave, the same number of harmonic pole pairs as the force wave number table was obtained, as well as the specific amplitude and frequency of the force wave. The correctness of the finite element method was verified by the comparison of the data of the two methods. The amplitude and frequency of the electromagnetic force wave can be analyzed quantitatively and quickly, and the error was minimal. The degree and position of the fluctuations on the spatial and time distribution of the radial electromagnetic force wave were clearly observed, which laid the foundation for the preliminary determination of the degree of influence of the electromagnetic vibration noise of the motor and the optimization design of the subsequent vibration damping and noise reduction.

Key words: permanent magnet synchronous motor (PMSM), integer slot, analytical method, harmonic analysis, electromagnetic force wave, finite element method