| 摘要 |
PROBLEM TO BE SOLVED: To provide a control device for improving accuracy of a feeding driving system of a machine tool. SOLUTION: This control device 1 has a position command generating device 10, and a position command signal S1 from the position command generating device 10 is sent to a current control unit 40 through a position control unit 20 and a speed control unit 30. An output of the current control unit 40 is sent to a servo motor 50, and the servo motor 50 drives a ball screw 70 for rotation. In response to the rotating speed and the quantity of rotation of the ball screw 70, a table 80 performs the linear motion through a ball nut 75. Rotation of the servo motor 50 is detected by an encoder 60, and fed back as position data to the position control unit 20, and differentiated by a differentiation circuit 25 and fed back as speed data to the speed control unit 30. A friction force correcting device 100 is added to this position control system. The friction force correcting device 100 has a friction force estimating device 110 and a correction quantity computing device 160.
|
