Stepper motor full stepping

Discussion in 'The Projects Forum' started by trelement, Feb 13, 2009.

  1. trelement

    Thread Starter New Member

    Feb 13, 2009
    1
    0
    Hey Everyone.

    I'm trying to get more torque from my unipolar stepper motor.
    I'm using a circuit similar to this
    http://www.elecfree.com/electronic/...08/03/basic-stepper-motor-driver-by-74194.GIF

    Except I'm just using the 74LS194, 555 timer (not the same resistances for the frequency), and a ULN2003 transistor array.

    What I want to do is change it from single stepping to power stepping ( 2 coils charged up per time )
    Its a 6 wire motor, black and brown pair 1; orange yellow pair 2.
    I tried putting pin 3 and pin 5 high and 4 and 6 as low.
    But the motor goes back and forth.
    I tried pin 3 and 4 high, 5 and 6 low; but no movement at all.

    How would I make this do power stepping with this shift register.

    If I cant do this, if I turn this into a bipolar motor ( ignoring the centre taps) and step it in full mode; roughly how much torque would I get versus single stepping a unipolar?

    Thanks in Advance!
     
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