High resolution stepping motor drive

摘要

A stepping motor control circuit for precisely controlling the motion thereof. The control circuit energizes the motor windings according to the design sequence for rotation in a given direction. Each winding is energized by a signal having an ascending staircase for its leading edge, a descending staircase for its trailing edge and a steady state level between the leading and trailing edges. The ascending staircase and the descending staircase each comprise one quarter of the terms for each winding energizing signal. The steady state level occurs for one half the time of each energizing signal. The total number of steps in all ascending and decending staircases is controlled and selects the total rotation of the motor. When the motor reaches the desired position whether in the middle of a staircase or not, the signals coupled to the stepping motor windings are frozen at the level when the total step count is reached.