Abstract

This article is a DC motor PWM speed control design study, the main

achievement of motor control. This course is primarily designed to achieve
PWM speed controller for forward and reverse, acceleration, deceleration,
and stop such an operation. And to achieve the circuit simulation. To achieve
system, microcomputer control, in the design, using AT89C51 microcontroller
control system as a whole, the core of the control circuit, accompanied by a
variety of shows, drive module enables the motor speed parameter display
and measurement; from the command input module, Optical isolation module
and   H-drive   module.   With   the   stand-alone   keyboard   with   a   break   as   a
command input, single-chip in the process control, continuing to the optical
isolation  circuit  to  send  PWM  waveform,  H-type  motor driving  circuit  to
complete positive inversion control. In the design, using PWM speed mode,
by changing the PWM duty cycle to change the motor armature voltage, so as
to realize the speed of the motor.  Design of the control  system hardware
structure   with   a   large   number   of   integrated   circuit   modules,   greatly