8085 Microprocessor Based Stepper Motor Control System

•    The motor is controlled by  ON/OFF the control winding.

•    The popular stepper motor used for demonstration in laboratories has a step size of 1.8° (i.e.,

200 steps per revolution).

•    This motor consist of four stator winding and require four switching sequence as shown.

•    The basic step size of the motor is called fult-step.

•    By altering the switching sequence, the motor can be made to run with incremental motion of half the full-step value. The switching sequence for half step rotation is shown.


Switching sequence for full step rotation

Switching sequence for half step rotation

•    A   two-phase   or   four   winding   stepper   motor   is   shown.   The   system   consist   of  8085 microprocessor  as  CPU,  EPROM  and  RAM  memory  for  program  &  data  storage  and  for stack.


8085 microprocessor based stepper motor control system


•    Using  INTEL  8279,  a  keyboard  and  six  number  of  7-segment  LED  display  have  been interfaced in the system. Through the keyboard the operator can issue commands to control the system. The LED display has been provided to display messages to the operator.

•    The windings of stepper motor are connected to the collector of Darlington pair transistors.

•    The  transistors  are  switched  ON/OFF  by  the  microprocessor  through the  ports  of8255  and buffer (74LS245).

•    A freewheeling diode is connected across each winding for fast switching.

•    The flowchart for the operational flow of the stepper motor control system is shown.

•    The  processor  has  to  output  a  switching  sequence  and  wait  for  I  to  5  mull-seconds  before sending next switching sequence. (The delay is necessary to allow the motor transients to die- out).


Flow chart for stepper motor speed control system

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