Abstract
The authors have proposed a new method of passively suppressing torque ripple in AC motors using magnetic periodic reversing springs (MPRS). In this method, the torque ripple is suppressed by optimally designing the order, phase, and amplitude of the torque fluctuation of the MPRS based on magnetic field analysis and mounting it concentrically to the output shaft of the AC motor. However, the results mentioned above were only a simplified evaluation based on static torque characteristics. In this paper, we solve the time-dependent field and evaluate the practicality of the MPRS in more detail. First, the effect of eddy current losses in the MPRS on motor efficiency is determined by three-dimensional finite element analysis. Furthermore, the possibility that radial forces acting between the rotors of the MPRS induce motor electromagnetic oscillations is evaluated.
