Patent ID: 8246336

Claim:
An injection molding machine, comprising: a hydraulic driving system for providing hydraulic power; a molding system configured for molding a workpiece; an injection system configured for injecting molten material into the molding system with the hydraulic power, the injection system comprising a cylinder and a piston movably received in the cylinder; an alternating current-charged coil configured to allow flow of an alternating current therethrough; and a closed-loop coil of wire; wherein one of the alternating current-charged coil and the closed-loop coil of wire surrounds the cylinder, and the other one of the alternating current-charged coil and the closed-loop coil of wire surrounds the piston and moves in unison with the piston; and the alternating current-charged coil imparts a force to the closed-loop coil of wire and makes the other one of the alternating current-charged coil and the closed-loop coil of wire surrounding the piston move acceleratingly, and the piston moves acceleratingly in unison with the other one of the alternating current-charged coil and the closed-loop coil of wire.