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Design and Implementation of a High Bandwidth Servo Controller for Micro-Machining Center

[+] Author Affiliations
Roy Chih-Lung Ko

National Yunlin University of Science and Technology, Taiwan, R.O.C.

Wang-Lin Liu

Precision Machinery Research and Development Center, Taiwan, R.O.C.

Paper No. MSEC2007-31066, pp. 743-750; 8 pages
doi:10.1115/MSEC2007-31066
From:
  • ASME 2007 International Manufacturing Science and Engineering Conference
  • ASME 2007 International Manufacturing Science and Engineering Conference
  • Atlanta, Georgia, USA, October 15–18, 2007
  • Conference Sponsors: Manufacturing Division
  • ISBN: 0-7918-4290-8 | eISBN: 0-7918-3809-9
  • Copyright © 2007 by ASME

abstract

To achieve the required performance of a Micro Machining Center, the control system must issue position commands with nanometer resolution, while holding the axis position with oscillations down to sub-micron level. The requirements call for a highly flexible CNC platform with unconventionally high-bandwidth servo controller. In this paper, we present a system-wide design based on an open CNC architecture with integrated digital servo drives. The proposed design incorporates customization of the digital protocol between CNC and drives, ultra-fine interpolation of the encoder signal, and novel approaches to increase the servo-loop bandwidth. A three-axis Micro Machining Center was successfully built with the proposed design, which was then proven to meet the stringent requirements with extensive dry-run and cutting experiments.

Copyright © 2007 by ASME

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