PULSE TO STEP STEPPING MOTOR CONTROL CIRCUIT

摘要

A control circuit for changing the energization of the windings of a stepping motor having two energizable winding phases with each phase being energizable to have one state or another state. The control comprises a first pair of switching devices connected to the one phase and having conditions for energizing or non-energizing the one state and for energizing or non-energizing the other state. A second pair of switching devices is connected to the second phase and having conditions for energizing or non-energizing the one state and for energizing or non-energizing the other state. Command pulses change one condition of one of the switching devices for each command pulse received with the changes following a repeating plural step sequence. There is a first sequence causing only one switching device to have an energized condition for each step, a second sequence in which both switching devices have an energized condition for each step and a third sequence in which one and both switching devices alternately have an energized condition for each step and means for selecting one of the sequences for the changes to follow. The motor may be caused to step at a base stepping speed and at a higher speed than the base speed, and the motor may be accelerated from and decelerated to the base stepping speed.