Abstract
With the trend toward higher-power electric-motor-driven injection molding machine, multi-AC servomotor control is needed to control the molding machine, making synchronous positioning control inevitable to prevent excessive mechanical stress in equipment. Synchronous positioning control in injection velocity control is implemented by using position feedback signals from motor pulse generators. In injection pressure control synchronous positioning control is difficult to realize because pressure-detector signal is used in place of position feedback signals. We clarified synchronous positioning control during injection pressure control by using both pressure-detector and position feedback signals as well as bumpless transfer from velocity control to pressure control by using SFC (Sequential Function Chart) programs. The experimental results by using a simulator apparatus showed that the synchronous positioning control error was less than ±4μm in pressure control.
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