Abstract
Locus ripples in the motion controlled mechatronic servo systems is discussed. The contour control of the mecha-tronic systems such as industrial robots and machine tools is generally implemented in a way such that an objective trajectory with a desired velocity is divided into small segments of the reference input time interval and actuators of the servo motors are controlled to pursue the divided segments. The relation between the reference input time interval and the locus ripples in the mechatronic systems were derived by using the first order model of the system and validated based on experimental results of an DC servo motor.