TY - GEN
T1 - A PMSM back-stepping time-varying sliding mode control system based on two-dimensional spaceborne ATP mechanism
AU - Liu, Xiangdong
AU - Zhao, Xiaorui
AU - Chen, Zhen
N1 - Publisher Copyright:
© 2016 IEEE.
PY - 2016/10/10
Y1 - 2016/10/10
N2 - the acquisition, tracking and pointing (ATP) mechanism plays a more and more important role in the space laser communication field. Its tracking performances determine the establishment of an optical communication link to a great extent. Thus, the tracking accuracy, rapidity and stability of the ATP system have always been hot issues. Two types of strategies are usually considered to improve the tracking performances. One is to improve the mechanical gimbal structure and the other is to improve the tracking control method. The latter is considered in this paper and a novel back-stepping time-varying sliding mode control strategy is proposed. The kinematic model of the two-dimensional photoelectric ATP mechanism is built up first and from this model it is concluded that the two axes can be controlled separately. Next the mathematical model of PMSM which is served as the execution unit of ATP mechanism is built up and the impact of friction torque is discussed either. Based on these analyses, the back-stepping time-varying sliding mode controller with an observer of load torque is designed and verified in MATLAB/SIMULINK. The simulation results of the new controller are compared in detail with the traditional PID controller's and it is evident that the tracking and pointing performances can be improved effectively by using the back-stepping time-varying sliding mode controller.
AB - the acquisition, tracking and pointing (ATP) mechanism plays a more and more important role in the space laser communication field. Its tracking performances determine the establishment of an optical communication link to a great extent. Thus, the tracking accuracy, rapidity and stability of the ATP system have always been hot issues. Two types of strategies are usually considered to improve the tracking performances. One is to improve the mechanical gimbal structure and the other is to improve the tracking control method. The latter is considered in this paper and a novel back-stepping time-varying sliding mode control strategy is proposed. The kinematic model of the two-dimensional photoelectric ATP mechanism is built up first and from this model it is concluded that the two axes can be controlled separately. Next the mathematical model of PMSM which is served as the execution unit of ATP mechanism is built up and the impact of friction torque is discussed either. Based on these analyses, the back-stepping time-varying sliding mode controller with an observer of load torque is designed and verified in MATLAB/SIMULINK. The simulation results of the new controller are compared in detail with the traditional PID controller's and it is evident that the tracking and pointing performances can be improved effectively by using the back-stepping time-varying sliding mode controller.
UR - http://www.scopus.com/inward/record.url?scp=84994236789&partnerID=8YFLogxK
U2 - 10.1109/CCA.2016.7587844
DO - 10.1109/CCA.2016.7587844
M3 - Conference contribution
AN - SCOPUS:84994236789
T3 - 2016 IEEE Conference on Control Applications, CCA 2016
SP - 249
EP - 254
BT - 2016 IEEE Conference on Control Applications, CCA 2016
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2016 IEEE Conference on Control Applications, CCA 2016
Y2 - 19 September 2016 through 22 September 2016
ER -