Servo cylinder is the motor forward and reverse rotation motion through the lead screw and screw pair of mechanical motion into a reciprocating motion . The servo motor closed-loop control characteristics , can be very convenient to achieve the precise control of thrust and velocity and position ; the modern motion control technology , numerical control technology and bus technology(Network) , procedures , bus(Network) control . Due to the convenience of the control and the use , the precision motion control of the cylinder and the hydraulic cylinder drive can not be realized .