| 摘要 |
PURPOSE:To effect control of the driving of a motor and its correct stopping in an open loop without detecting rotational speed, by making the DC motor perform step operation using an integrator. CONSTITUTION:Because the output of an AND gate 12 changes to negative by the change-over of a switch 2 when a time t0 is passed, a constant value current i1 which was flowing in the opposite direction flows in the direction shown in the figure through a capacitor C1, and since a capacitor C2 has a polarity as shown in the figure and the output of a comparator 15 changes from positive to negative, the transistor TR18 is turned on, and because the output of an AND gate 16 stays negative, transistors Q1 and Q3 continue to be on and transistors Q2 and Q4 continue to be off, accelerating a motor 3. When the state of the switch 2 is changed at a time t1, the output of the comparator 15 is maintained positive, changing the output of the AND gate 16 to positive and turning transistors Q1 and Q3 off and Q2 and Q4 on to invert electric voltage applied to the motor 3, which exerts reverse breaking. At a time t2 the output of the comparator 15 changes from positive to negative to turn off the transistor TR18 and the voltage applied to the motor 3 disappears. |
