Abstract
In this paper, a robust model-free nonsingular terminal sliding-mode control (MFNTSMC) algorithm based on the ultra-local model is proposed to reduce the influence of permanent magnet (PM) demagnetization for PM synchronous motors (PMSMs). First, the PMSM mathematical model in normal and demagnetization is described, and the ultra-local model of speed loop and current loop is constructed based on the input and the output of the PMSM vector control system. Then, the MFNTSMC method is proposed and adopted to design the speed controller and d-q -axis current controller, and the sliding-mode observer is designed to estimate the unknown terms of the ultra-local model. Finally, compared with the PI control method and model-free control method, the results of simulations and experimentations show that the MFNTSMC method can improve the dynamic response while maintaining robustness of PMSM driven system, reduce the dependence of the design of controller on the precise PMSM model, and has fault-tolerant control function for PM demagnetization fault.
Highlights
Permanent magnet synchronous motors (PMSMs) have gradually become one of the most potential motors in industry field due to its advantages of simple structure, high efficiency and energy saving [1]
The results show that the motor torque and current pulsation controlled by model-free nonsingular terminal sliding mode control (MFNTSMC) method is small than PI method and modelfree control (MFC) method
The novel MFNTSMC algorithm for PMSM drives system is proposed in this paper
Summary
Permanent magnet synchronous motors (PMSMs) have gradually become one of the most potential motors in industry field due to its advantages of simple structure, high efficiency and energy saving [1]. PMSMs have been widely applied in railway traction system, electric vehicle, aerospace and other fields. The traditional proportional-integral (PI) control scheme are widely applied in the speed controller and current controller of PMSM drive systems, because of their simplicity and easy implementation. Traditional PI controller is difficult to meet the control requirements of high-performance drive systems because of integral windup [2]. The stability of permanent magnets (PM) is often affected by temperature, electromagnetic field and other factors, in severe cases even leading to the demagnetization fault.
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