关键词: 永磁同步电机, 电磁力密度波, 振动和噪声, 永磁体磁畴聚向排列结构

Abstract: The surface mounted external rotor permanent magnet synchronous motor was taken as an example to conduct a deep analysis of the vibration and noise of permanent magnet synchronous motor through simulation calculation and theoretical analysis. The time and spatial orders of the electromagnetic force density that affected the electromagnetic vibration and noise of the motor, as well as the specific number of magnetic density harmonics were given, providing a clear direction for accurate optimization of the electromagnetic vibration and noise of the motor. The vibration and noise of the surface mounted external rotor permanent magnet synchronous motor were optimized by using the permanent magnet domain convergence arrangement structure without changing any size or structure of the product. The cost of motor materials was
also reduced.

Key words: permanent magnet synchronous motor, electromagnetic force density, vibration and noise, convergence arrangement structure of permanent magnet domain