| 摘要 |
PURPOSE:To stably drive a motor without influence of a noise by providing noise margins in both the stop of the motor in the upward direction after moving the motor and the stop after moving the motor in the downward direction. CONSTITUTION:A power source 13 for a dead band is connected so that a comparator 4 side becomes positive between the inverting input minus terminal of a comparator 4 for leading an up signal and a movable terminal of a potentiometer 3, and the power source 14 is connected so that the comparator 5 side becomes negative between the noninverting plus terminal of a comparator 5 similarly for leading a down signal and the movable terminal of the potentiometer 3. If the outputs of the comparators are not presented, the corresponding dead band signal source signal is placed on a feedback signal, input to the comparator, and if presented, the signal is not placed, but only a feedback signal is inputted to the comparator. Thus, a stable operation can be performed by providing a noise margin in the stop. |
