Abstract
This paper investigates the position regulation problem of permanent magnet synchronous motor (PMSM) subject to parameter uncertainties and external disturbances. A novel fractional second-order nonsingular terminal sliding mode control (F2NTSMC) is proposed and the finite time stability of the closed-loop system is ensured. A sliding mode disturbance observer (SMDO) is developed to estimate and make feedforward compensation for the lumped disturbances of the PMSM system. Moreover, the finite-time convergence of estimation errors can be guaranteed. The control scheme combining F2NTSMC and SMDO can not only improve performance of the closed-loop system and attenuate disturbances, but also reduce chattering effectively. Simulation results show that the proposed control method can obtain satisfactory position tracking performance and strong robustness.
Highlights
Permanent magnet synchronous motor has been widely applied in industrial automation, household appliances, computers, high-speed aerospace drives, and automobiles due to its superior properties such as high power density, high efficiency, low inertia, and reliable operation [1, 2]
The control objective is to design a F2NTSMC with sliding mode disturbance observer (SMDO) to track the reference trajectory θd in finite time
The performance of the conventional terminal sliding mode control (TSMC) method and the 2NTSMC method is simulated for comparison
Summary
Permanent magnet synchronous motor has been widely applied in industrial automation, household appliances, computers, high-speed aerospace drives, and automobiles due to its superior properties such as high power density, high efficiency, low inertia, and reliable operation [1, 2]. To achieve high-performance control, various advanced control methods have been proposed, such as adaptive control [3], robust control [4], sliding mode control [5, 6], optimal control [7], backstepping control [8], predictive control [9], fuzzy control [10], neural network control [11], finite-time control [12], fractional order control [13, 14], and intelligent control [15] These methods have increased the dynamic and steady state performance of PMSM systems to some degree. A new fractional second-order nonsingular terminal sliding mode controller (F2NTSMC) is proposed to ensure fast and finite-time convergence of the PMSM system.
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