US 4,025,837 A · Adaptive control circuit for a stepping motor

Abstract

Adaptive control circuit for a stepping motor in which each motor displacement from a present position to a target position is monitored and the proportion of acceleration signals to deceleration signals is modified as necessary to obtain minimal elapsed time during motor movement. Each designated motor displacement is assigned a corresponding number of acceleration signals which are applied to move the motor. Then during a subsequent homing of the motor, the motor displacement is monitored and the number of acceleration signals previously applied is either altered or left unchanged as a result of comparison between this displacement and a standard. The adaptive control circuit is shown as applied to printing apparatus in which a print disk is variously rotated by a first stepping motor mounted on a carrier and the carrier is moved along a print line by a second stepping motor.

Claims10

Dependent claims

An adaptive control system for a stepper motor driving a load to a target position, comprising:

means for generating advance signals representative of the number of advance increments required for said motor to reach said target position;
storage means responsive to said advance signals for indicating the number of acceleration increments for said motor corresponding to said number of advance signals;
means responsive to said storage indications for sequentially applying advance signals to said motor according to said number of acceleration increments;
means on said motor for generating output signals proportional to displacement thereof;
means activated by the termination of said acceleration signals for applying deceleration signals to slow said motor to a predetermined speed;
means responsive to said advance increments and said output signals for applying stop signals to said motor;
means for counting displacement signals of said motor at said predetermined speed until the occurrence of said stop signal;
means operable at the conclusion of said counting for comparing said displacement signal count with predetermined values;
and
means responsive to said comparison means for altering the number of said acceleration signal corresponding with said number of advance increments in said storage means.

7 more elements

Dependencies are inferred from the claim text.

Adaptive control circuit for a stepping motor

Life of this patent

Adaptive control circuit for a stepping motor

Life of this patent

Abstract

Claims10