CLOSED LOOP DRIVING CONTROLLER FOR STEPPING MOTOR

摘要

PURPOSE:To automatically return a rotor to an original positioning stable point even if the rotor is rotated by an external force, by contriving a phase exciting sequence not to be switched by rotation of within + or -2 steps of the rotor at the time of rest. CONSTITUTION:Till the new input of stepping motor rotation command pulse signalis provided after the rest of a rotor 11 and even of the rotor 11 is displaced by an external force, a device is organized to hold an original phase exciting sequence in a range wherein its displacement quantity is less than + or -2 steps, and to generate the output of final position hold signal from a zero hold circuit 16. When the rotor 11 is rotated + or -2 steps or more, then the output of cancel signal is generated from a pulse counter 15, and the final position hold signal from the zero hold circuit 16 to a latch circuit 14 is cancelled, and the latch circuit 14 is turned into an unlatched state.