Unique advanced homodyne laser interferometer system provides a cost-effective and simple position feedback solution for precision motion control applications

2004 ◽  
Author(s):  
Steve E. Jones ◽  
Mark Chapman ◽  
Lucy Attwood
Keyword(s):  
Motion Control ◽  
Laser Interferometer ◽  
Cost Effective ◽  
Control Applications ◽  
Precision Motion Control ◽  
Position Feedback ◽  
Precision Motion

scholarly journals Large-amplitude Dithering Mitigates Glitches in Digital-to-analogue Converters

2019 ◽  
Author(s):  
Arnfinn Eielsen ◽  
John Leth ◽  
Andrew J. Fleming ◽  
Adrian Wills ◽  
Brett Ninness
Keyword(s):  
Motion Control ◽  
High Precision ◽  
High Frequency ◽  
Large Amplitude ◽  
Control Law ◽  
Control Applications ◽  
Precision Motion Control ◽  
Low Pass ◽  
Converter Topologies ◽  
Precision Motion

This paper develops and experimentally evaluates a dither-based method for improved generation of arbitrary signals in digital-to-analogue converters that exhibits glitches --- essentially converting the glitches from high-frequency to low-frequency disturbances. One major benefit of this behaviour appears in closed-loop control applications, as the glitch disturbance can be moved from outside control law bandwidth to inside control law bandwidth, enabling suppression by feedback. A behavioural model of glitches is presented and the effect of applying a dither signal is analysed in detail. Analytical and experimental results demonstrate that a dither signal with sufficiently large amplitude can mitigate the effect of glitches, when used in conjunction with a low-pass filter. Severe glitches appear in various digital-to-analogue converter topologies, including converter topologies that are used in high-precision motion control applications, such as adaptive optics and scanning force microscopy. Glitches introduce impulse-like disturbances which have a broadband frequency distribution. Low-pass filtering alone does not provide sufficient attenuation, and in applications with feedback control only frequency content within the control law bandwidth is attenuated. Hence, a high-frequency disturbance such as a glitch will not be suppressed. The use of dithering to suppress glitches is therefore beneficial in applications where errors in signal conversion are a primary concern, such as high-precision motion control or accurate reference signal generation.

The Study of Control System for Reconfigurable Machine Tool Model

2011 ◽  
Vol 188 ◽  
pp. 499-502
Author(s):  
L. Zhou ◽  
Wen Jie Nie ◽  
Z.R. Liao ◽  
X.R. Liang ◽  
G.Q. Pan
Keyword(s):  
Control System ◽  
Machine Tool ◽  
Motion Control ◽  
Machine Tools ◽  
Single Chip ◽  
Single Chip Microcomputer ◽  
Precision Motion Control ◽  
Single Function ◽  
Precision Motion ◽  
Reconfigurable Machine Tool

With the higher requirements of product processing, single-function machine can not meet the production needs. By analyzing the principles of reconfigurable machine tools, based on 51 single-chip microcomputer, this article researches the control system of reconfigurable machine tool, implements precision motion control for motors. The research can also reduce costs, so the practicality and economy all have a certain advantage, which will help promote the use in practice.

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