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Question One of my IBTs is getting too hot

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by 29ford, Mar 13, 2024.

Page 2 of 2
  1. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    So to be clear, when the power is off the motors are back driven by the mass of the rig?

    Can you please post pictures of your rig and current SMC3 settings.

    Are you using 24v with IBT2s, as other members have reported some issues doing that?
    noorbeast, Nov 30, 2024
    #21
  2. 29ford

    29ford Member

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    So to be clear, when the power is off the motors are back driven by the mass of the rig?

    Yeah that's correct.

    I am using 24v motors but have turned psus down to 20v after hearing of this problem.

    Will get some pictures when I'm with the rig and post them
    29ford, Nov 30, 2024
    #22
  3. 29ford

    29ford Member

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    My Motion Simulator:
    2DOF
    This is my rig as you can see with the motors off the rig drops down until the arms from the motors hit the bottom of the lower frame. It looks like alot of other people's rigs stay stationary at the mid point.

    Attached Files:

    29ford, Nov 30, 2024
    #23
  4. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    +10,903 / 54 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    Given the gear ratio and a full-frame design you may need to shorten the CTC of the levers, and I see there is a shorter hole already, that won't stop the motors being back driven but will reduce the load on the motors and IBT2s:

    [​IMG]
    noorbeast, Nov 30, 2024
    #24
  5. 29ford

    29ford Member

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    I will try that. I drilled extra holes for adjustability but never tried it on the shorter ones.
    for reference the CTC distance is 95mm on the further away holes and 70 on the closer ones
    29ford, Nov 30, 2024
    #25
  6. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    Balance:
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    +10,903 / 54 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    You could also try one at 50mm.
    noorbeast, Nov 30, 2024
    #26
  7. Attyla.pl

    Attyla.pl Active Member

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    My Motion Simulator:
    2DOF, DC motor, Arduino
    Change these faulty IBT2 to
    https://www.xsimulator.net/community/threads/reasonably-priced-100a-motor-controllers.17638/

    I did so and the problem disappeared for several months I use this 100A controller and everything is OK :) .
    To use this 100A controller you need to reprogram the arduino in “mode=1”
    As for the tilting of the platform without powered motors it's just that you have an unbalanced upper part of the platform.
    You should build a top frame attach the seat and the rest of the hardware to it and while sitting on it put, for example, a brush stick under it and moving back and forth find the center of gravity, such a balanced platform will stay horizontal when the motors are off.
    Attyla.pl, Nov 30, 2024
    #27
  8. 29ford

    29ford Member

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    Thanks for the link that look interesting do you think 1 would be suitable for 2 520w motors looks like it should handle them. As they are pulling less than 25 amps as I have 25 amp inline fuses installed on my motors now.
    29ford, Nov 30, 2024
    #28
  9. Attyla.pl

    Attyla.pl Active Member

    Joined:
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    My Motion Simulator:
    2DOF, DC motor, Arduino
    I have experience only with 250W motors with a consumption of 13.5A at a peak of 20A, user Wangard uses ampflow e30-150 24v motors maybe you can talk to him ?
    Attyla.pl, Nov 30, 2024
    #29
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