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Thread: stepper - voltage drop

  1. #1
    Junior Member Newbie
    Join Date
    Aug 2004
    Location
    Pune
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    11

    Default stepper - voltage drop

    I am using one stepper at 12v with uln2003 as driver

    when i check the supply voltage without motor it shows 12v
    But when steppers r running supply voltage shows 9v...............
    When i run 2 steppers the supply voltage shows 8v
    why is this voltage drop?
    my steppers r at fault? or the stepper driver?

    I am giving +12 to common and control the rest 4 wires with
    (1000), (0100), (0010), (0001) ie. with a +5v in rotation to the 4 coils.
    Current of about 65mA is used by the stepper at 12v voltage.
    It rotates at max speed of 65 revolutions/minute (200 steps/revolution)
    Is this speed of rotation fine? or is it too slow for a micromouse.

    -Hardik

  2. #2
    Senior Member Cyborg
    Join Date
    Aug 2004
    Location
    Bangalore
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    Default

    I think your power supply is getting loaded .... check it
    Sumandeep Banerjee
    M.Tech, IIT Kharagpur,
    B.Tech, IIT Kharagpur,
    http://www.robotix.in

  3. #3
    Junior Member Newbie
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    Aug 2004
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    Pune
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    Default

    Its just the microcontroller and one stepper i am driving with the i/p power. I am giving the input power from an adapter(500mA).
    and the current used by my circuit is not exceeding 200mA.
    .....so if i am right ...the circuit requirement is less than what the adapter can source......??????????? what else could be the problem?

  4. #4
    Junior Member Newbie
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    Aug 2004
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    Pune
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    Default

    Hey sumandeep thankyou for replying......i checked the i/p given through the adapter....more the current pulled byt the circuit....more is the voltage drop....there is something wrong with the adapter and not the circuit or the motor....

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