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Improvement of Tracking Accuracy of Positioning Systems with Iron Core Linear DC Motors  

Song, Chang-Kyu (Intelligence & Precision Machine Department, Korea Institute of Machinery & Materials)
Kim, Gyung-Ho (Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology)
Publication Information
International Journal of Precision Engineering and Manufacturing / v.6, no.1, 2005 , pp. 31-35 More about this Journal
Abstract
Higher productivity requires high-speed motion of machine tool axes. The iron core linear DC motor (LDM) is widely accepted as a viable candidate for high-speed machine tool feed unit. LDM, however, has two inherent disturbance force components, namely cogging and thrust force ripple. These disturbance forces directly affect the tracking accuracy of the feeding system and must be eliminated or reduced. In order to reduce motor ripple, this research adapted the feedforward compensation method and neural network control. Experiments carried out with the linear motor test setup show that these control methods are effective in reducing motor ripple.
Keywords
Linear DC motor (LDM); Tracking control; Feedforward compensation; Neural network; Cogging force;
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