a motor driving circuit apparatus for use in a motor actuator for actuating , for example , a valve between two limit positions , having a control means for inputting a driving control signal for the motor , a sensor adapted to output a signal corresponding to the position of the actuator , and a comparator section adapted to compare the input through the control means and the output from the sensor , the comparator being adapted to produce an output signal in accordance with which the motor is driven and controlled . the motor driving circuit apparatus comprises a differentiation circuit for differentiating the output of the comparator section and a timer section adapted to be controlled by the output from the differentiation circuit , wherein the driving control of the motor by the output of the comparator section is conducted only within a predetermined period of time in accordance with the output from the timer section .