Abstract
The robust nonlinear speed control technique has been proposed for the speed regulation of permanent magnet synchronous motor (PMSM) by adopting a new fast terminal sliding mode control (FTSMC) based on the finite time sliding mode observer (FTSMO). The proposed technique can ensure the robustness against load disturbances, which has the capability of high tracking precision, fast finite time convergence and smooth dynamic operation in both transient and steady state conditions. Moreover, the requirement of high switching gain to reach the upper bound limit of total disturbances may produce the steady state error and chattering. To address this issue, one robust FTSMO based FTSMC is designed to alleviate those limitations aforementioned. The FTSMO can successfully estimate the total disturbances of the system, then the estimated disturbances can be compensated by the feed-forward compensation technique. The FTSMO based FTSMC should require the smaller switching gain to meet upper bound limit of the disturbances compared with the conventional SMC (CSMC) and FTSMC. The stability of the close loop control system is fully verified by the Lyapunov theory. Comprehensive simulation and experimental results have fully demonstrated that the proposed method is robust against load disturbances.
Highlights
Due to the high power and torque density, the permanent magnet synchronous motor (PMSM) has been applied in many emerging applications, such as electric vehicle (EV) [1]
The robust nonlinear speed control technique has been proposed for the speed regulation of permanent magnet synchronous motor (PMSM) by adopting a new fast terminal sliding mode control (FTSMC) based on the finite time sliding mode observer (FTSMO)
In this paper, the FTSMO based FTSMC has been implemented for the speed regulation of the PMSM drive system with load disturbance
Summary
Due to the high power and torque density, the permanent magnet synchronous motor (PMSM) has been applied in many emerging applications, such as electric vehicle (EV) [1]. In order to increase the PMSM drive performance, great efforts in recent years have been made to develop nonlinear control techniques, such as adaptive control [4], disturbance rejection [5] [6], finite time control [7], linear sliding mode control (SMC) [8], robust control, predictive control [9], fuzzy and neural control [10], back stepping and intelligent control [1], [7], [10], and so on. A new fast terminal SMC (FTSMC) has been adapted for the PMSM drive system, which has the capability of fast finite time convergence, high tracking precision, excellent steady state process, and effective chattering alleviation in the whole system.
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