Research on PMSM Sliding-mode Vector Combined Speed Controller Based on Improved Exponential Reaching Law

Abstract

Sliding mode control has good robustness, but the traditional sliding mode has the problem of chattering. Aiming at the conflict between velocity and chattering in the approach stage of sliding mode control, a new reaching law is put forward. By improving the isokinetic approach term of the traditional exponential reaching law, the system’s requirements in different stages of sliding mode motion are met, and this contradiction has been effectively improved. At the same time, to better improve the control effect of permanent magnet synchronous motor (PMSM) speed regulation system, combined with the traditional PI control with no static error and no overshoot, a combined speed controller combining sliding mode control and PI control is designed to enhance the robustness of the system. By building a model in Matlab/SIMULINK for simulation, the effectiveness of the improved exponential reaching law and the improvement of the system performance brought by the combined speed controller are verified respectively.

Research on Multiple-Axis Contour Error Suppression Method Based on Composite Layered Control

“…In summary, using the improved S-type-function-based sliding-mode control (ISSMC) can enable the system state outside the stable point to reach the stable point in a finite time, and the required time to reach it will be less than [t 1 + t 2 ]. The specific calculation is shown in Equation (21).…”

“…Among them, sliding-mode control [19,20] has become a research hotspot amongst the current control methods because of its insensitivity to system model parameter perturbation and its strong robustness, and it is suitable for use in complex and strongly nonlinear multiaxis control systems. Examples of sliding-mode control applications in motors can be found in references [21][22][23] and others. However, sliding-mode control is not flawless.…”

Application of a new type of super twist sliding mode control in flywheel energy storage

“…Compared with chemical energy storage, flywheel energy storage has high efficiency, long life, high safety, pollution-free, and so on [4][5]. PMSM has been widely used in flywheel motors because of its simple structure, high efficiency and excellent performance [6][7]. The flywheel energy storage system needs to operate at high speed and disturbance, and the power storage information needs to be determined by the speed of the flywheel motor.…”