Calculation and analysis of magnetic force and vibration in low-speed surface-mounted permanent magnet machines accounting for eccentric and concentric magnet poles
Abstract: In this paper, magnetic force and vibration in low-speed surface-mounted permanent magnet (PM) machines accounting for eccentric and concentric magnet poles are investigated. It is shown that the number of harmonics and total harmonic distortion (THD) of radial flux density and radial force density, cogging torque, and displacement of stator core in concentric PM machine are much bigger than those in eccentric PM machine. The eccentric magnetic pole is helpful to reduce vibration and acoustic noise. And the ratio of the mean square error of the radial force on the teeth of the two prototype machines are approximately equal to the ratio of the peak-peak value of the displacement at the outer periphery of the stator core of the two prototype machines.
