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A linear drive system for the dynamic focus module of SLS machines

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Abstract

This paper presents a linear drive system that implements the high-accuracy reciprocating motion of the dynamic focus module in selective laser sintering (SLS) rapid prototyping manufacturing. The linear drive system consists of a moving-coil type PM linear DC motor (LDM), a DSP-based digital controller, a pulse-width modulated servo amplifier, and a linear optical encoder. The special configuration and dynamic model of the LDM are presented, the transfer function of the control system is derived, and a PID feedback controller including a low-pass filter with the derivative term and a model-based feedforward controller are designed. The present experiment proves that the tracking performance of the control system is satisfactory. The experimental results show that the linear drive system has fast dynamic response and acceptable tracking error in the driving dynamic focus module of SLS machines.

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Acknowledgements

This project is supported by the National Natural Science Foundation of China (grant no. 60474021) and National 863 Hi-Tech. Program of China (grant no. 2002AA423120). The authors would like to express their special thanks to Prof. Liu Yi from the English Department, Huazhong University of Science and Technology, China, for his patient help in the proofreading of the paper.

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Authors and Affiliations

  1. Engineering Research Center of Numerical Control System, School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei Province, 430074, People’s Republic of China

    Du Zhiqiang, Zhou Zude, Ai Wu & Chen Youping

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  1. Du Zhiqiang
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  2. Zhou Zude
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  3. Ai Wu
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  4. Chen Youping
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Correspondence to Du Zhiqiang.

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Zhiqiang, D., Zude, Z., Wu, A. et al. A linear drive system for the dynamic focus module of SLS machines. Int J Adv Manuf Technol 32, 1211–1217 (2007). https://doi.org/10.1007/s00170-006-0442-5

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  • DOI: https://doi.org/10.1007/s00170-006-0442-5

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