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Question Motors stop working when putting pressure

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by Daniel Nagay, May 5, 2023.

  1. Daniel Nagay

    Daniel Nagay New Member Gold Contributor

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    My Motion Simulator:
    2DOF, DC motor, Arduino
    I am having an issue where when I lean to far in a direction the motors stop working and start to fall due to gravity and they are no longer being held in place. Sometimes it happens right as I start the game, other times it fails a minute into the game. I will attach a video that will show it failing. I have tried changing the kp value, increasing fan speed to cool off the ibt-2 motor controllers thinking it is overheating. Has anyone had this issue and knows what could solve it because I feel like these motors are plenty strong to support the weight. I weigh less than 180lb.


    I built a 2 DOF racing sim using the ibt-2 motor controllers and 12v Crab Pot motors. The motor is 12v, 15amp, 180watts. My psu specification is 24v 600w.

    IMG_2891.JPG



    My Settings
    Xnip2023-05-04_23-02-23.jpg
    I tried increasing kp up to 500
    Would like suggestions with other settings that might play a role.

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    Daniel Nagay, May 5, 2023
    #1
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    For a hefty full frame compact design with limited inherent design leverage you need to shorten the lever Center to Center distance to the rod connecting hole, likely to around 50-60mm, as torque in such a design is far more important than speed.
    noorbeast, May 5, 2023
    #2
  3. Gadget999

    Gadget999 Well-Known Member

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    Your motor drivers are overheating
    Gadget999, May 5, 2023
    #3
  4. ferslash

    ferslash Active Member

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    i have not read the whole tread but... year ago it happened to my sim and at the end it was "a weak psu" is your psu powerfull enough?
    ferslash, May 5, 2023
    #4
  5. Daniel Nagay

    Daniel Nagay New Member Gold Contributor

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    My Motion Simulator:
    2DOF, DC motor, Arduino
    I added a larger fan and it helped reduce it a bit. I think its a combination of overheating and arms being to large.
    • Agree Agree x 1
    Daniel Nagay, May 6, 2023
    #5
  6. Daniel Nagay

    Daniel Nagay New Member Gold Contributor

    Joined:
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    My Motion Simulator:
    2DOF, DC motor, Arduino
    It should be powerful enough because 180 watt per motor so 360 watts total and psi is 600 watts
    Daniel Nagay, May 6, 2023
    #6
  7. Daniel Nagay

    Daniel Nagay New Member Gold Contributor

    Joined:
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    +4 / 0 / -0
    My Motion Simulator:
    2DOF, DC motor, Arduino
    I might work on making another arm some time later, hope that will resolve the issue but it may take some time for me to make a new one. First I will redesign the case so that it gets better airflow for the motor controllers. I appreciate the quick response.
    Daniel Nagay, May 6, 2023
    #7
  8. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    noorbeast, May 6, 2023
    #8
  9. DinhoBR

    DinhoBR New Member

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    Engineer
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    My Motion Simulator:
    2DOF, DC motor, Arduino
    Sorry I do not understand. Are you running 12V motors on 24V PSU? Doesn't that burn the engine?
    DinhoBR, May 25, 2023
    #9