ABSTRACT
DC motor has a good startup performance and speed characteristics,
it is characterized by starting torque, maximum torque, in a wide
range of smooth, economical speed, speed, easy control, speed control
after the high efficiency. This design of DC motor speed control
system, mainly by the microcontroller 51, power supply, H-bridge
driver circuits, LED liquid crystal display, the Hall velocity and
independent key component circuits of electronic products. Power
supply with 78 series chip +5 V, +15 V for motor speed control using
PWM wave mode, PWM is a pulse width modulation, duty cycle by
changing the MCU 51. Achieved through independent buttons start and
stop the motor, speed control, turning the manual control, LED
realize the measurement data (speed) of the display. Motor speed
using Hall sensor output square wave, by 51 seconds to 1
microcontroller square wave pulses are counted to calculate the speed
of the motor to achieve a DC motor feedback control.
Keywords: DC motor speed control；H bridge driver circuit；LED display
评论0