scholarly journals Design of Digital Controllers for a Two-Degree-of-Freedom Control System Using an Approximate Model-Matching Method. 1st Report. Case of Scalar System.

1992 ◽  
Vol 58 (551) ◽  
pp. 2289-2292
Author(s):  
Tomio NAKAMURA ◽  
Goro OBINATA ◽  
Yoshio TAKAHASHI
Author(s):  
Qixin Zhu ◽  
Lei Xiong ◽  
Hongli Liu ◽  
Yonghong Zhu ◽  
Guoping Zhang

Background: The conventional method using one-degree-of-freedom (1DOF) controller for Permanent Magnet Synchronous Motor (PMSM) servo system has the trade-off problem between the dynamic performance and the robustness. Methods: In this paper, by using H∞ control theory, a novel robust two-degree-of-freedom (2DOF) controller has been proposed to improve the position control performance of PMSM servo system. Using robust control theory and 2DOF control theory, a H∞ robust position controller has been designed and discussed in detail. Results: The trade-off problem between the dynamic performance and robustness which exists in one-degree-of-freedom (1DOF) control can be dealt with by the application of 2DOF control theory. Then, through H∞ control theory, the design of robust position controller can be translated to H∞ robust standard design problem. Moreover, the control system with robust controller has been proved to be stable. Conclusion: Further simulation results demonstrate that compared with the conventional PID control, the designed control system has better robustness and attenuation to the disturbance of load impact.


1998 ◽  
Vol 64 (620) ◽  
pp. 1382-1389 ◽  
Author(s):  
Kouji OKUDA ◽  
Kazuyuki KUHARA ◽  
Minoru SASAKI ◽  
Fumio FUJISAWA

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