Combined sliding surface position control for induction motor based on internal negative attenuation reaching law
NIU Chao1, WEI Shangbei2
(1.Department of Mechanical Engineering of Henan Mechanical and Electrical Vocational College, Zhengzhou 451191,China; 2.Department of Information Technology of Henan Judicial Political Vocational College, Zhengzhou 451191, China)
 

Abstract: Aiming at the problem that the dynamic performance of linear sliding mode surface in induction motor control was good but whose steadystate performance was poor, and the dynamic characteristics of integral sliding surface was poor but whose steadystate performance was good; merits of the two sliding mode surface mentioned above were associated and a new combined sliding mode surface was proposed in this paper. The smoothswitching between the linear and integral sliding mode surface was realized by setting a threshold value, and changing the switchvalue based on the relationship of the deviation and threshold value. Meanwhile, aiming at the problem of buffering in control system, the reaching law with internal negative attenuation was designed which made the shiftswitch showed a negative attenuation near zero. The rabidity of tendency phase and robustness of quasimoving sliding mode were guaranteed and whose trembling was weakened simultaneously. Simulation analyses were compared with the traditional sliding mode surface control strategy. The results indicated that the combined sliding mode surface for induction motor based on integral negative attenuation possesses good characters of dynamic, stability and robust, and whose trembling is also weakenes effectively.
Key words: induction motor; combination of sliding surface; reaching law with internal negative attenuation; sliding mode control