Patent ID: 7911172

Claim:
A machine position control device comprising: a position-speed control means for receiving as input a position command signal indicating a position target value of a load driven by a motor, and a control-target position signal as reference information related to present positions of the motor and the load, and for outputting a torque command signal as a target value of torque at which the motor drives the load; a stability compensation means for receiving as input a load position signal as a present-position measurement value of the load, and for outputting a compensated load-position signal after a phase delay of the load position signal has been compensated based on a phase-advance transfer function; and a position-signal combination means for combining a signal including a high-frequency component of a motor position signal as a present-position measurement value of the motor, with a signal including a low-frequency component of the compensated load-position signal, and for outputting the control-target position signal.