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interfacing unipolar motor with LITTLE STEP U — Parallax Forums

interfacing unipolar motor with LITTLE STEP U

BOBNAPATORBOBNAPATOR Posts: 6
edited 2007-01-18 21:40 in Robotics
turn.gif

roll.gif

yes it turns! but only at relatively low speed, and only in one direction.

I've tuned my exercising program ( BS2), and motor turns with loosing steps. When I ask to go back, anyway, at any speed, it vibrates, but doesn't turn.

I've monitored position register, set ramp to 0, and pause during the busy signal is on. All is ok, but in reverse.

Does any one have an idea?

Thank you in advance

Bob

Comments

  • kelvin jameskelvin james Posts: 531
    edited 2007-01-13 18:41
    Sounds like you don't have the coils ( at least two )wired properly.
    The coil wire colour scheme varies from one motor to another. I would advise you find out the proper wiring first, because if you put the motor supply voltage back to the logic side of the stepu, you will damage it. What kind of motor are you using?

    kelvin
  • kelvin jameskelvin james Posts: 531
    edited 2007-01-15 18:32
    Sounds like you have indentified the wiring properly. The coils are matched as AC and BD. With mine, i have one coil connected to the stepu pins A and C, and the other with B and D. Give that a whirl.

    kelvin
  • BOBNAPATORBOBNAPATOR Posts: 6
    edited 2007-01-18 21:40
    roll.gif

    Yes, you are right. Now it's ok. I found lot of contradictory documentation in different websites about stepper motor.

    Regards.

    Bob
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