Distributed control of hot bar thermode in fine pitch surface mountassembly

摘要

A hot bar thermode is viewed as a process with spatiallydistributed controlled variable (temperature) and disturbance (thermalload). A transfer matrix model, describing thermal inertia and heatpropagation in the thermode, is defined and the model parameters areexperimentally estimated. This model, implemented in software, is usedto evaluate various control techniques: the existingsingle-input-single-output scheme, single-input-multi-output withweighted averaging of feedback signals, and adaptivesingle-input-multi-output scheme. A novel configuration of a hot barthermode, suitable for multi-input-multi-output control is proposed. Theefficiency of this technology is demonstrated by computer simulation