Harmonics suppression of PMSM using repetitive control and application to improvement of sensorless control performance

Using the repetitive control, Authors have proposed the suppression method of harmonic currents in the vector control system for PMSM. In this paper, we propose a new simplified harmonics suppression system and a method improving the stability margin of the control system and convergence speed of harmonics. With stability analysis and experimental results, we confirm the proposed method. Moreover, this paper shows that the proposed control system can be used for improvement of position/velocity sensorless control performance with voltage commands and currents that are purified by the repetitive control. To evaluate our proposed system, the sensorless control system which is constructed on the basis of the extended EMF disturbance observer is taken as an example, and the improvement effectiveness of the proposed control system is confirmed by experimental results.