步进电机驱动电路

步进电机, 电路, 驱动

M1是一个从旧的磁盘驱动器上拆下来的。它有5个引脚：公共端，线圈1，2，3和4.公
共端与各组线圈之间的电阻阻值很精确，均为75欧。那么当电压为＋5V时，每组线圈的驱
动电流为60mA。ULN2003是一个达灵顿管阵列，用来扩展2051的驱动能力。当电压为50V时
最大可提供500mA的电流。从电路图上可看到，2051的四个输出端P1.4到P1.7连接到了ULN
2003的输入端。四个4.7K的电阻帮助2051从电源处获得更多的驱动电流。串口可随意选择.





  程序

stepper.c
stepper.hex

/*
* STEPPER.C
* sweeping stepper's rotor cw and cww 400 steps
* Copyright (c) 1999 by W.Sirichote
*/

#include c:\mc51\8051io.h  /* include i/o header file */
#include c:\mc51\8051reg.h

register unsigned char j,flag1,temp;
register unsigned int cw_n,ccw_n;

unsigned char step[8]={0x80,0xc0,0x40,0x60,0x20,0x30,0x10,0x90}
#define n 400

/* flag1 mask byte
0x01  run cw()
0x02  run ccw()
*/

main()

{
  flag1=0;
  serinit(9600);
  disable();  /* no need timer interrupt */
  cw_n = n; /* initial step number for cw */
  flag1 |=0x01; /* initial enable cw() */

while(1){
  {
tick_wait();  /* wait for 10ms elapsed */

energize(); /* round-robin execution the following tasks every 10ms */
cw();
ccw();
  }
      }

}

cw(){
   if((flag1&0x01)!=0)
   {
      cw_n--;    /* decrement cw step number */
      if (cw_n !=0)
      j++;       /* if not zero increment index j */
      else
      {flag1&=~0x01; /* disable cw() execution */
      ccw_n = n; /* reload step number to ccw counter */
      flag1 |=0x02; /* enable cww() execution */
      }
   }

}

ccw(){
   if((flag1&0x02)!=0)
   {
      ccw_n--;    /* decremnent ccw step number */
      if (ccw_n !=0)
      j--;       /* if not zero decrement index j */
      else
      {flag1&=~0x02; /* disable ccw() execution */
      cw_n = n;    /* reload step number to cw counter */
      flag1 |=0x01; /* enable cw() execution */
      }
   }

}

tick_wait(){ /* cputick was replaced by simpler ASM code 10ms wait */

asm" JNB TCON.5,*"; /* wait for TF0 set */
asm" CLR TCON.5";    /* clear TF0 for further set */
asm" ORL TH0,#$DC"; /* reload TH0 with $DC, TL0 = 0 */
}

energize(){

P1 = step[(j&0x07)];  /* only step 0-7 needed */
}

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