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

作者：Du Zhiqiang^*; Zhou Zude; Ai Wu; Chen Youping

来源：International Journal of Advanced Manufacturing Technology, 2007, 32(11-12): 1211-1217.

DOI：10.1007/s00170-006-0442-5

• linear drive system
• dynamic focus module
• position tracking control
• linear DC motor

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.

• 出版日期2007-5
• 单位华中科技大学