This paper presents a system identification
technique and control scheme for dual parallel linear motors applied to the injector of injection molding machines. The dual motors are mechanically coupled to
provide a joint thrust that is approximately twice of that of a single motor for injection in order to reduce the
demand for large thrust linear motors. The proposed synchronous control scheme is designed to satisfy an injection cycle involving a number of mode switchings
(e.g., velocity-to-force control for filling-to-packing). In the control scheme, a synchronous controller is designed to reduce the synchronization error between the dual motors. A disturbance observer is also
developed to estimate the mold cavity pressure, based on which, the filling-to-packing switchover control can
be performed. Experimental studies conducted on an injection load simulator validate the effectiveness and feasibility of the proposed system.