However typical stepper motors make 1. 8degrees or 7. 5degrees which corresponds to 200 or 48 steps per rotation . Te diagram below illustrates the sequence of steps that the rotor makes in reaction to changes in stator current. Tis configuration uses the second method described in full step where the current in the stator of one phase is first switched off then its direction is reversed. Tis happens alternatively for both phases and effectively an 8 step sequence is achieved as illustrated in Fig. Cmponents: A89C51 micro controller, Sepper Motor, Cystals, Rsistors, Cpacitors.
A89C51 is a microcontroller of low power, hgh-performance, COS 8bit, 8051 family microcontroller while ULN2003A is a current driver IC . Te figure on the below this section shows a screenshot of some of the pulses used to drive the stepper motor during simulation. Tis is just one of the graphs seen on the virtual oscilloscope of the simulator. Sown in the graph are the pulses for forward driving of the stepper while not shown but performed are the pulses for reverse direction drive.
simulation was limited in relation to the scope of control that is intended for this circuit. Te simulation was performed for normal mode operation only. Te aim was to establish the logical connections between components was right and determine that the circuit can actually drive a stepper motor. Smulation of the circuit in this paper is not limited to Proteus but other platforms can be utilized to test its functionality for example Keil C that uses C language to program the 8051 microcontroller . Te implementation above is just of the many circuits available that can drive a stepper motor.
I has been shown that despite existence of these ready-made drive circuits, uderstanding the principle over which they are built is paramount for future implementations and improvements. Te process though lacking in some areas has successfully demonstrated how a stepper motor can be controlled in certain ways by exploiting its design...
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