Abstract
With the trend toward higher-power electric-motor-driven injection molding machines, 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 signals are 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. Simulation results showed that synchronous positioning control error was less than ±4μm in pressure control.
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