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.