Electromagnetic Vibration Analysis of the Permanent Magnet Vernier Machine With Dynamic Eccentricity Effect

This paper aims to analyze the electromagnetic vibration of the permanent magnet vernier machine (PMVM) with dynamic eccentricity effect. Firstly, the topology of the PMVM and the definition of the dynamic eccentricity effect are introduced. Then, the magnetic field of the PMVM is calculated. The PM MMF and armature reaction MMF of the PMVM with dynamic eccentricity effect can be transformed by the eccentric air-gap permeance to change the magnetic field. And it can generate the unbalanced magnetic force (UMF) that can have bad impact on the electromagnetic vibration. What is more, the flux density and the UMF are calculated by FEM and analytical method. And the result shows that the electromagnetic vibration of the PMVM with dynamic eccentricity effect is worse. Finally, a new winding structure has been proposed to reduce the UMF of the PMVM with dynamic eccentricity effect. The result shows that it can reduce the electromagnetic vibration without scarifying torque performance.