A Torque Ripple Reduction Method for the Synchronous Reluctance Machines With Mirror Asymmetric Rotor Laminations

The synchronous reluctance motor (SynRM) possesses a simple structure and low cost. However, its application is hindered by high-torque ripple. Traditional asymmetric designs can effectively suppress torque ripple. However, it often exhibits poor performance during reverse rotation and lacks theoretical guidance. In this article, an analytical model is developed to establish the relationship between torque and flux barrier end angles. A novel technique is then proposed to mitigate the torque ripple of the SynRM by introducing mirror asymmetric rotor laminations. These laminations feature asymmetrically designed flux barriers in one pole and periodically symmetric ones in the adjacent pole, arranged in a mirrored stacking configuration. The proposed technique is implemented in practical machines, and the effectiveness of the proposed method is validated through experimental tests.