Abstract:
PURPOSE: A time delay control method using gradient estimation for a robot manipulator and a controller of a robot manipulator using the same are provided to restricts the influence of nonlinear friction without chattering in tracking response by effectively compensating a time delay estimation error. CONSTITUTION: A time delay control method using gradient estimation for a robot manipulator under nonlinear friction is as follows. The torque of an actuator of a robotic manipulator is expressed by an equation that includes an estimated gradient for compensating a time delay estimation error. The estimated gradient functions as a high-pass filter for a time delay estimation error.
Abstract:
PURPOSE: A decelerator to prevent backlash is provided to regularly maintain tension produced to a cable when realizing high reduction ratio and to prevent backlash caused by the cable. CONSTITUTION: A decelerator to prevent backlash includes a driving unit(100), plural rotating units(200), and an outputting unit(300). In the driving unit, an end of a driving shaft(120) is coupled to a driving motor(140) and a primary cable(180) is wound on the periphery of the other end of the driving shaft. In the rotating unit, the primary cable is wound on the periphery of a primary cylinder(220) with extended and a rotating shaft(240) is penetrated in the direction of the central shaft of the primary cylinder, and the primary cylinder is reciprocated in the direction of axis. In the outputting unit, a secondary cable(160) wound on the rotating shaft is wound on the periphery of a secondary cylinder(320) with extended and an output shaft(340) is penetrated in the direction of the central shaft of the secondary cylinder. The cylinder can be reciprocated in the direction of the axis of the rotating and output shaft by the cable and the tension of the cable is regularly maintained. Therefore, backlash caused by the cable is prevented.