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Question Dc motor driver proplems

Discussion in 'DIY Motion Simulator Projects' started by jonas bandier, Sep 16, 2020.

  1. jonas bandier

    jonas bandier New Member Gold Contributor

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    Hi everyone . A am currently in the midst of converting my diy 2 dof into a 3 dof. roll, pitch AND heave. This means that the motors need to work much harder, since the rig can not be in balance.

    The problems:

    I hooked the ibt_2 drivers up to the motors and tested with some simple up and down motion, but suddenly the motor just stopped. There was no smoke or smell from the drivers or the motors. The driver was not even hot.

    The ibt_2 drivers have been running just fine before with very smooth motion and plenty of power without getting hot at all.

    I am therefore thinking if it would be possible to hook two drivers in parallel and get double the amperage. Would this work? Have any of you tried it? Can you recommend some other motor drivers that would be more suitable?

    Also, i am planning to install a spring at the universal joint, so the motor don't need to work as hard. Have you tried it? How do i choose a spring?

    Looking forward to the replies.

    Cheers.

    Specs:
    - 24v
    - SMC3 (arduino)
    - 3 Wheelchair motor 300w each (12,5A but peak current can usually be higher)
    - 100a 24v 2400w power supply
    - propperply around 120 kg when fully loaded
    - Around 100mm of heave motion at max
    - BTS7960B H-bridge drivers

    Attached Files:

  2. Ads Master

    Ads Master

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  3. Gadget999

    Gadget999 Well-Known Member

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    yes you can use 2 of them at once

    they automatically shut down if they get hot

    check my build to see the 100A motor drivers i use
  4. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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  5. jonas bandier

    jonas bandier New Member Gold Contributor

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    Ok. I have made this drawing of how i think it should go together. (the wires to the arduino is obviously not correct and is only for illustration)
    Is it guanteed that the load would spread evenly to both drivers?

    Thanks!

    Attached Files:

  6. Gadget999

    Gadget999 Well-Known Member

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    That looks correct
  7. BlazinH

    BlazinH Well-Known Member

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    The ibt-2 is generally not able to cope with larger and longer current draws that is usually associated with heave. It has a flaw in its design that doesn't allow much heat to get transfered to the heat sink so they constantly shut down or burn up.
  8. jonas bandier

    jonas bandier New Member Gold Contributor

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    Ok. I have already ordered 5 more drivers to put them in parallel, so we will se what happens. The weird thing is that they did not get very hot with 2dof, compared to the vhn5019 driver that i used before. I am also thinking of adding a heatsink directly on the chip anyways.

    What driver do you think is more suitable?

    Thanks.
  9. Gadget999

    Gadget999 Well-Known Member

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    • Like Like x 1
  10. jonas bandier

    jonas bandier New Member Gold Contributor

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    Nice. I can't find them in the EU so if this fails i will try those. Thank you very much!