| 摘要 |
PURPOSE:To maintain a stability at the time of stationary, to decrease an excessive deviation at the time of a high speed action and for example, to easily realize the high construction accuracy with XY plotters by providing a nonlinear device at a speed feedback system. CONSTITUTION:In an XY biaxial control device, a nonlinear device 6 has the function to change the speed signal obtained from a speed detecting device 5 to the characteristic like a nonlinear speed signal 9. At the time of the scope where the actual speed of a controlled system does not exceed + or -A, the nonlinear device 6 outputs the signal in proportion to the speed signal obtained by the speed detecting device 5, when the actual speed of the controlled system exceeds + or -A, the nonlinear device 6 lowers an amplifying ratio, and executes the controlling so that the speed feedback quantity as the damping to a servomotor driving device 3 cannot be increased to the necessity or above. Consequently, even when the gain of the speed feedback loop is also increased at the time of the high speed action, the nonlinear device 6 is operated, the excessive speed feedback quantity is decreased and the necessary motor speed is obtained. Thus, the deviation quantity in the excessive condition can be decreased.
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