Accurate positioning of a servo moved load e.g. for x-y table or microscope table

摘要

A servo system has a motor moving a load using a leadscrew transmission. The positioning cycle has a coarse range (16) and a fine range (22). The coarse range involves a trapezoidal velocity profile until the load is near to the target position (15). Pulses are applied to achieve the final location over the fine range.