Disturbance observer based non‑singular fast terminal sliding mode control of permanent magnet synchronous motors

Junjie Jiang; Housheng Zhang; Duo Jin; Ao Wang; Longhao Liu

Disturbance observer based non‑singular fast terminal sliding mode control of permanent magnet synchronous motors

Vol. 24, No. 2, pp. 249-257, Feb. 2024

10.1007/s43236-023-00725-w

Permanent magnet synchronous motor

Vector control

New exponential reaching law

Non-singular fast terminal sliding mode

Disturbance observation

Abstract

The existence of load disturbance can lead to the instability of permanent magnet synchronous motor (PMSM) speed control systems. Therefore, a non-singular fast terminal sliding mode control (NFTSMC) strategy based on a disturbance observer is proposed in this paper. First, a new exponential reaching law is presented to relate the rate of convergence to the state error and switching function, which achieves an improvement of the system convergence speed while reducing system jitter. At the same time, to eliminate system jitter, a new smooth saturation function is introduced in place of the symbolic function. Second, a non-singular fast terminal (NFT) sliding surface is generated by combining a nonlinear function with a linear funtion, which makes the state error converge rapidly at different stages. Finally, a disturbance observer is built to boost the robustness of the control system by observing the outside disturbance value and feeding it back to the speed controller. The dependability and effectiveness of the proposed control strategy are confirmed by simulation experiments with MATLAB.

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Cite this article

[IEEE Style]

J. Jiang, H. Zhang, D. Jin, A. Wang, L. Liu, "Disturbance observer based non‑singular fast terminal sliding mode control of permanent magnet synchronous motors," Journal of Power Electronics, vol. 24, no. 2, pp. 249-257, 2024. DOI: 10.1007/s43236-023-00725-w.

[ACM Style]

Junjie Jiang, Housheng Zhang, Duo Jin, Ao Wang, and Longhao Liu. 2024. Disturbance observer based non‑singular fast terminal sliding mode control of permanent magnet synchronous motors. Journal of Power Electronics, 24, 2, (2024), 249-257. DOI: 10.1007/s43236-023-00725-w.