Radial force and vibration in surface-mounted permanent magnet vernier machines

This paper mainly deal with the radial force and vibration of the surface-mounted permanent magnet vernier machine (SPMVM) with the integer slot distributed windings (ISDW) and the fractional-slot concentrated windings (FSCW). The harmonic order and frequency of the radial force in SPMVM with the permanent magnet surface-mounted on rotor or stator tooth are detailed discussed by the analytical and finite-element analysis (FEA) methods. A prototype is built to validate the analysis of radial force and investigate the effect of the low-order harmonic radial force on vibration in SPMVM.