Design of the Stepping Motor Control System Based on SCM
Qiu Haizhao
(College of Engineering, South China Agricultural University, Guangzhou 510642,China)
Abstract:With the development of automatic control system and the requirements of
high-precision control, stepping motor control in automation is playing an increasingly
important role, different from the common DC and AC motor, stepper motor rotation angle and
rotational speed can be high-precision controlled. Stepper motor as a control actuator is a key
component of mechanical and electrical integration, widely used in a variety of automated
control systems and precision machinery and other fields.
Stepper motor is the open-loop control components changing electric pulse signals into
angular displacement or linear displacement .In the case of non-overloaded, the motor speed,
stop position depends only on the pulse frequency and pulse number, regardless of load
changes, that is, to add a pulse motor, the motor is turned a step angle.
This system introduces a design of stepper motor control system based on single chip
microcomputer, including hardware design and software design in two parts. Among them, the
hardware design, including single chip minimal system, keyboard control module, LCD
display module, the stepper motor drive module, position detection module five functional
modules. System software design using C language, including the main program, process
number keys, the key of function processes, motor driver handler, the display module, position
acquisition module.
This design uses STC89C52 microcontroller as the main controller, 4 * 4 matrix keyboard
as an input, LCD1602 LCD as a display, ULN2003A chip as stepper motor driver. System has
a good user interface, keyboard input stepper motor running distance; Stepper motor can run at
different speed, and run to any given position accurately in any speed without exceeding the
maximum speed, with a strong adjustable ; Display the running distance and the actual running
distance, which is more convenient for the operator to use.
Key words: SCM stepper LCD keyboard driver
