Super- Twisting Algorithm for Back EMF Harmonic Rejection in a Permanent Magnet Synchronous Motor

A robust super-twisting algorithm for harmonic perturbation rejection in permanent magnet synchronous motors is proposed in this paper. The algorithm design is related with the back electromotive force harmonics affecting the motor. Thus, robust performance is achieved under these perturbations. The proposed algorithm is compared against proportional integral control to demonstrate its advantages. Simulations in MATLAB and experimental results are presented. The stator current quality improvement is demonstrated experimentally by reducing the THD from 8.28 0/0, obtained with proportional-integral control, to 0.88 % by using the proposed algorithm. In simulations the reduction is from 19.93 % to 0.68 % THD. All the results show the excellent performance of the proposed algorithm.