Super-Twisting Terminal Sliding Mode Decoupling Current Control for Sinusoidal Doubly Salient Electromagnetic Machine Drives

The current control is essential to achieve the high performance of the sinusoidal doubly salient electromagnetic machine (SDSEM). However, the current loop suffers from both the coupling effect and system uncertainty disturbances, which deteriorates its control performance. To address this problem, this paper proposes a super-twisting terminal sliding mode decoupling current control (STTSMD) method, which consists of a current decoupling controller and a super-twisting terminal sliding mode controller. The former can completely decouple the d- and q-axis currents on the premise of ignoring the system uncertainty disturbances, having the advantages of simple structure and easy implementation; the latter can effectively eliminate the adverse influence of the system uncertainty disturbances, having the advantages of fast convergence and chattering suppression. The proposed STTSMD method can improve the dynamic and steady-state response as well as the robustness of SDSEM current control. Finally, the effectiveness of the proposed method is verified by simulation and experiment.