Robust and precision motion control system of linear-motor direct drive for high-speed X-Y table positioning mechanism
Zuo Zong Liu
Fang Lin Luo
Rahman, M.A.
Shandong Technol. Univ., Jinan, China;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Oct. 2005
Volume: 52,
Issue: 5
On page(s): 1357- 1363
ISSN: 0278-0046
INSPEC Accession Number: 8590530
Digital Object Identifier: 10.1109/TIE.2005.855661
Current Version Published: 2005-09-26
Abstract
In this paper, design and implementation of an H∞-based precision motion control system is presented for a high-speed linear-motor direct-drive X-Y table positioning mechanism in semiconductor wire-bonding applications. The system works with a cascaded robust feedback control, which has an inner loop velocity controller and an outer loop position controller, and an autotuning feedforward compensator. The design aim is to achieve high and consistent tracking performance even in the presence of considerable resonance uncertainties and external disturbances. Toward this aim the velocity controller is designed using H∞ optimization technique, based on reduced-order modeling that considers three significant resonance modes and neglects all other resonance modes having an insignificant amplitude and/or too high frequency. These neglected modes and variations of the three resonance modes from machine to machine (due to manufacturing tolerance) and/or with different operating conditions are taken care of by appropriate additive uncertainty representation in the design phase. The resulting system is validated and implemented with a profile motion of a maximum acceleration of 5.2 g (1g=9.81 m/s2) on mass-produced wire bonding machines.
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