Improving the quality of the classic servo drive by modifying the motion control algorithm

Frequently CNC machines use rotary servo drives and a kinematic chain in the form of pulling screw with a nut. The disadvantage of that structure is: non-linear and falling friction, the susceptibility of the pulling screw to the torsion deformation and the backlash. In [3-5] outlines ways to modify the servo drive structure to minimize frictional effects and pulling screw elasticity in order to achieve better motion quality. The present paper presents modified structure of the digital servo drive control system to eliminate the oscillations of the servo drive position with backlash.