volume | PIER Journals

Abstract

To address speed-tracking degradation and torsional vibration caused by flexible-shaft coupling and load disturbances in PMSM dual-inertia systems, this paper proposes a high-order nonsingular fast integral terminal sliding mode control (HONFITSMC) method integrated with dual finite-time extended sliding mode disturbance observers (FTESMDOs). First, a third-order load-side dynamic model is derived to explicitly describe the effects of shaft torque and load disturbance. Next, the HONFITSMC method is developed using an inner integral sliding surface, an outer high-order sliding surface, and a dual-power reaching law. Furthermore, a weighting function is introduced to adapt the convergence speed across different error regions, reducing chattering and improving speed-tracking accuracy. Then, dual FTESMDOs are designed for the motor side and load side to estimate the shaft torque and load-side disturbances, and the estimated values are fed forward into the control law for real-time compensation. The simulated and experimental results demonstrate that the proposed control scheme significantly improves the system's disturbance rejection capability and overall robustness.

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Dr. Jinyang Zou

Professor Kaihui Zhao

Dr. Gang Fan

Dr. Kai Shen

Dr. Lin Jia