Robust Position Controller Design for Linear Servo Units Used in Noncircular Machining

Abstract:

This paper presents the design and implementation of a robust motion control structure for linear servo units used in noncircular machining. Compared with ball/screw driven system, the controller of the linear motor driven system must provide a high level of disturbance rejection performance, as the system is more sensitive to force disturbances and parameter variations. Thus, in this paper, a robust feedback controller based on disturbance observer is applied to enhance the stiffness and robustness. A magnitude and phase regulating control scheme (MPRC) is proposed to improve the system tracking accuracy, and a simple error feedforward compensator (EFC) further reduces the feedforward control error that result from inaccurate frequency response data. The effectiveness of the proposed controller is demonstrated by experiments.

• Periodical: Materials Science Forum (Volumes 471-472)
• Pages: 755-759
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.471-472.755
• Online since: December 2004
• Authors: S.T. Huang, Jing Feng Zhi, Hao Bo Cheng, W. Zuo
• Keywords: Linear Motor, Noncircular Machining, Position Tracking Control, Robust Control

References

[1] D.M. Alter: J. of Eng. for Industry Vol. 116 (1994), p.298.

[2] M. Tomizuka and M.S. Chen: J. of Dyn. Syst., Meas., and Control Vol. 109 (1987), p.176.

[3] C.L. Hwang: International Journal of Machine Tools & Manufacture Vol. 39 (1999), p.209.

[4] C.J. Kempf: IEEE Transactions on Control Systems Technology Vol. 7 (1999), p.513.

[5] K.K. Tan: IEEE Transactions on Magnetics Vol. 39 (2003), p.1813.

[6] J.H. Kim: Proceedings of the Power Conversion Conference, Vol. 1 (2002), p.37.

[7] M. Cheng: Chinese Journal of Mechanical Engineering Vol. 37 No. 8 (2001), p.43.