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small, battery powered stepper motor

Discussion in 'Electronic Basics' started by [email protected], May 7, 2007.

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  1. Guest

    I am looking to use a basic stamp controlled (with a ULN2003 chip)
    stepper motor in a small (pocket sized), battery powered prototype. it
    doesnt need much torque at all. the problem is i dont know much at all
    about stepper motors...specifically which one to use.

    i need it to be battery powered (a small battery) and cheap. i was
    thinking something along the lines of a NAMA 17. it needs to draw
    power from a small battery...maybe as big as a standard 9 volt but
    hopefully smaller (any ideas?).
    is the basic setup i'm going to be using...except with a smaller basic
    stamp board.

    any help or suggestions would be VERY much appreciated. i'm looking to
    get it done soon as my opportunity to use (for free :D ) the Rutgers
    University SLA rapid prototyping machine will be gone shortly. you may
    post suggestions here or email me at .

    much thanks,
  2. BobG

    BobG Guest

    One problem with stepper motors is that one coil is always on.... a
    'trick' to reduce the holding current is stick an R in series with
    each coil. Use 4 outputs... a pair for each coil... energize coils
    like this to go one way... 01 01, 01 10, 10 10, 10 01, and back to 01
  3. Guest

    my plan was to actually remove the current after each desired sequence
    of movement as there will be something to hold the motor in its
    position. i only need it to move a certain amount of degrees then
    stop...i have a mechanical break or holding mechanism.
  4. Sjouke Burry

    Sjouke Burry Guest

    If you bridge the resistor with a capacitor,
    you get a powerful step response, without to
    much coil heating, and a useful holding force.
    Just design the cap value such that at the
    maximum step speed, the voltage on the resistor
    has dropped to about half of the start value, and
    the resistor value for an acceptable hold force.
  5. Guest

    does anyone have a suggestion for a small, slow, relatively
    inexpensive, low torque, low voltage and able to be powered by a small
    battery stepper motor?
  6. BobG

    BobG Guest

    There are lots of them listed on Jameco, for example. I'd say, the
    higher the coil ohms the better for battery operation.
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