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2DOF Motion simulator project

Discussion in 'DIY Motion Simulator Projects' started by Jomar_Sarto, Feb 24, 2015.

  1. Jomar_Sarto

    Jomar_Sarto Member

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    I think yes..somewhat like that sir @noorbeast. Currently, I already have 4 identical wiper motors and I plan on sacrificing two of them. I will remove the dc motor from the gearbox and I will attach its shaft on the output of the second motor..roughly something like this sir: nhth.png
  2. Jomar_Sarto

    Jomar_Sarto Member

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    sorry..i did not realize that the image was this big..
  3. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    In addition to the mechanical loss it may also end up being too slow. You are likely better off looking at other potential sources for suitable motors/gearboxes.
    • Agree Agree x 1
  4. Jomar_Sarto

    Jomar_Sarto Member

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    oh..i see.. i really thought that it will somehow increase its power in the expense of its agility.. I already spent too much as my budget is very limited..I'm hoping to use the materials I already have.. :(
  5. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    The challenge you face is the actual design, as a full frame with motors directly leveraging the back of the seat it will take a lot of torque to drive it. Winches would be your cheapest option. Otherwise consider converting it to a foot or shoulder mount design where you can take advantage of the inherent leverage in those designs.
    • Agree Agree x 1
    Last edited: Jun 3, 2015
  6. Jomar_Sarto

    Jomar_Sarto Member

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    thank you for that information sir @noorbeast ! I may redesign it to shoulder mount. Could you please tell me more about the shoulder mount design and on how can I implement it on my current setup.. thank you so much!
  7. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    • Informative Informative x 1
  8. RacingMat

    RacingMat Well-Known Member Gold Contributor

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    My Motion Simulator:
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    can you share some specifications? motor speed / gearbox ratio

    indeed, the drawback will be speed loss under an acceptable level... sorry
  9. Jomar_Sarto

    Jomar_Sarto Member

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    Thank you sir @noorbeast and @RacingMat for your prompt replies.. it really helps me.. I decided to reconfigure it to shoulder mount. I forgot the exact model of the wiper motor..I will ask my father later to look for it's specs again. For now, I will upload pictures of the wiper motor, maybe you can roughly estimate it's power.

    Attached Files:

  10. Jomar_Sarto

    Jomar_Sarto Member

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    here is my plan on reconstructing my setup sir:

    11020443_774214692654832_1761831036_n.jpg
  11. Jomar_Sarto

    Jomar_Sarto Member

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    Then the rough sketch for the new location of the motor and connecting rods:

    Attached Files:

  12. Jomar_Sarto

    Jomar_Sarto Member

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    Does my planned modifications are correct, sir @noorbeast and sir @RacingMat . Feel free to correct me and give your thoughts regarding this matter. Thank you very much! :)
  13. Jomar_Sarto

    Jomar_Sarto Member

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    This is a circuit I designed in attempt of synchronizing the motors. I did not test it yet but done simulations to predict the outcome. I'm not really sure if it will do the trick.. just trying things out. :) Please share your thoughts.. everyone is welcome.. :)

    Capture.PNG



    The idea of the circuit goes like this:
    1) The four motors will have their own potentiometer
    2) The two motors that must be synchronized will use this buffer circuit
    3) The output of two potentiometers will be combined to give 1 "averaged" output for the arduino
    4) The output of the 2 potentiometers will be somewhat "averaged" by this circuit so that, if the 1 motor is lagging a little bit, the circuit will send a less stressful feedback...somehow.. I'm not really sure yet.. :/
    Last edited: Jun 4, 2015
  14. Jomar_Sarto

    Jomar_Sarto Member

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    If someone is interested to check and modify the synchronization circuit, I'll attach the multisim file of it.

    Attached Files:

  15. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
    AC motor, Motion platform
    Sorry, but I'm struggling to see how this circuit will help you, what will you do with the output - which motor will it go to - how will you decided? If you must go down this route, why don't you just try to mechanically mix the two motors output drive arms on the one axis? It is not ideal - or maybe pretty, and would only give you a small variants window, but would have a better chance of working IMO. It is basically similar to how the shafts mix at the top of two actuators on a 6DOF stewart platform.
    Mechanical mixer.jpg
    • Informative Informative x 1
    Last edited: Jun 8, 2015
  16. Jomar_Sarto

    Jomar_Sarto Member

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    nkghk.png Thank you for that idea sir @SeatTime ! I will incorporate that solution on my setup. The circuit is designed to monitor the position of the potentiometer. Since both pot will produce a certain amount of voltage potential with respect to its wiper position, the circuit will try to compensate with the variance between the voltages by somewhat "mixing" the signal.
  17. Jomar_Sarto

    Jomar_Sarto Member

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    Hi guys! it's been a while since I post here.. I would like to report the progress of my build.. here are the photos. I already made the electronics part and I already tested it. my concern is that every time I'm trying to run the left and right motor, one channel of the motor controller gets really hot. when i run the channels separately, it runs cool.. I think it has something to do with the feedback pots (AO4 and AO5 pinout of the arduino). Any ideas? WP_20150701_003.jpg WP_20150702_001.jpg