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MDL-BDC24 ability questions

Josh Cote
Prodigy 40 points

Is the "MDL-BDC24" "Black Jaguar" able to run a Servodisc motor? i have 3 Kollmorgan U12M4 Servodisc Motors they run at 44v 9a with peak of 85a. i was wondering if 2 MDL-BDC24's in parallel can run one of these motors?

The reason why i would prefer a Jaguar is because they have proven themselfs to be reliable threwout my FIRST Robotics time. Also they have a built in Position control, Limit Switch, and they look like a good finished product.

The motors and controllers will be doing alot of work, because my project is a 3d Printer, so i am looking for acceracy down to less than a millimeter, i know the motors and table and encoders are capable of it because its orriginal perpose was an Axial Inserter from Universal Insturments. The table HAD a slew rate down to .02 mm. i would like to beable to come down close to that.

  • TI__Expert 3415 points

    The issue with these motors and the MDL-BDC24 is the voltage.  MDL-BDC24 are capable of running up to 30 V (max). The data sheet, available at http://focus.ti.com/docs/toolsw/folders/print/mdl-bdc24.html, specifies a VIN range up to 30 V and also indicates that the absolute maximum supply voltage is 35 V.  Above that it will incurr damage.

    It is probably outside of the scope of your project, but the Jaguar's goal in life was two fold. One, to make FIRST projects easier by providing a platform that could do some of the control tasks internally (call the built in high-speed PID functions rather than writing them). Two, to serve as an educational tool for creating a similar device.  If you have the ability (time, etc) to spin your own, Jaguar's schematics and software could be leveraged.  Replace the HBrige and modify hbridge.c to match.  I realize that is a tall order, but something to consider if time and resources permit.

    -Scott
    (Also a Mentor of FRC 2468)

  • in reply to Scott McMahon
    Prodigy 40 points

    i was hopeing i would beable to run 2 of them at 24v in parallel, so the motor would beable to recieve about 44 volts. to solve for the voltage issue.

    i do have some knowlage in electronics, i am able to debug problems, but i have nowere near the knolage to redesign/modify a complex motor control. i have basic understanding of H-Briges. this project i was hopeing to have done by the start of build season for FRC. so my team can use it to do our prototyping if not more. after high school i will look back at this project and hopefullly make a v.2 to clean up any inefficency's. hopefully by then i will have the knowlage and want to build my own.

    Thank you for you responce scott, but can having 2 jaguars in parallel solve the voltage problem?

  • in reply to Josh Cote
    TI__Expert 3415 points

    You cannot parallel them and achieve what you want to do.

  • in reply to Scott McMahon
    Prodigy 40 points

    Thank you scott, do you have any sugjestions to accomplish this task, like another product, paying someone to modify the jaguar, or something more efficient.

  • in reply to Josh Cote
    Prodigy 40 points

    i have been talking with my friends about this, and i have found one that is interested in helping me out, and he is willing to try to modify the MDL-BDC24. Scott told me that the schimatics can be arranged.