Stepping motor closed loop constant velocity control system

Details Stepping motor closed loop constant velocity control system Stepping motor closed loop constant velocity control system

G - Physics

05

B

318/18

G05B 19/40 (2006.01) H02P 8/20 (2006.01) H02P 23/00 (2006.01)

Patent

CA 1078918

STEPPING MOTOR CLOSED LOOP CONSTANT VELOCITY CONTROL SYSTEM Abstract of the Disclosure A closed loop control system for controlling the rotational velocity of a stepping motor during a period of continuous shaft rotation such that the velocity remains constant is disclosed. Step response signals are developed for each step increment of movement of the shaft of the stepping motor. The step response signals are used to control the counting of clock pulses by a counter, resulting in the production of measured interstep time (Tt) date. The Tt data is gated to a controller functioning in accordance with the equation [2Dt-1+(Tnom-Tt)]/2, to produce step delay control (Dt) data, where Dt-1 data is the step delay control data for the previous step and Tnom data is predetermined nominal interstep time data. Each newly developed Dt data is used to preset a counter that controls the production of the next motor stepping control pulse, and becomes Dt-1 for the next calculation. Separate Dt data is developed for both the clockwise and counterclockwise directions of rotation of the stepping motor shaft.

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