A NZ newspaper company came to us to ask us to develop a controller for the many slo-syn synchronous motors that control colour registration adjustments on their Goss colour printing press. These synchronous motors can behave as excellent stepper motors when the necessary phase contol is applied to their power feed. Our controller was designed to control 20 individual motors. The controlling software could specify direction and number of steps from 1 to 65,535 or continuous. The controller was multi-threaded enabling the control of any motor, whilst other motors were in operation.
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