SERVO CONTROL SYSTEM

A servo control system effects control of a control object directly from an arbitrary stop position to a target position smoothly and safely. The servo control system has a detector for detecting an absolute position of the control object, and an observer for observing state values such as the position and/or velocity of the control object and a disturbance applied to the control object so as to servo-control the control object. The servo control system calculates initial state values of the observer determined according to the stop or rest position of the control object at the start of the operation so that the initial values are utilized for calculation of the state values by the observer. The observer calculates the state values and estimated values according to an algorithm at one sample preceding period, thereby enabling computation suitable to digital processing by the sampling mode operation.