Micro DC motor steady speed control circuit b

Micro DC motor steady speed control circuit b

Micro motor drive circuit with speed stabilization function The
    micro DC motor speed stabilization control circuit is shown in Figure 8-32. Circle (a) shows the voltage feedback method, which is a miniature DC motor
drive circuit used in tape recorders . It uses the NE 555 time base integrated circuit to output switching pulses through the VT1 transistor to drive the motor to rotate . NE 555 ② pin is the negative feedback signal input terminal. Stable speed control is achieved through a feedback loop. Pin ② is connected to an external potentiometer VR1 to fine-tune the speed . Figure (b) shows a motor drive circuit using speed feedback mode. It is equipped with a speed measurement signal generator TG on the motor . After the speed signal is rectified and filtered, it becomes a DC voltage and is fed back to the @ pin of the NE 555. Detection and comparison, and then the variable control signal is output by pin ⑤, so as to achieve the purpose of stable speed.