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MWB 4 DOF Simulator

Discussion in 'DIY Motion Simulator Projects' started by MWB, Aug 29, 2016.

  1. MWB

    MWB Drive it like you stole it!! Gold Contributor

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    My Motion Simulator:
    2DOF, DC motor, Arduino, Motion platform, 4DOF, 6DOF
    Thanks @SilentChill, this seemed to do the trick, I also lowered the PWMmax to 140, what did you have the Kp set to on your old rig?
  2. SilentChill

    SilentChill Problem Maker SimTools 2.0 Beta Tester

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    Cool glad it worked, I had a similar problem and I changed that many things I don't know what fixed it on Fpid 1 lol

    I had my pwmmax set to 190 any higher my psu would trip .

    Kp was set to 450/500
    • Like Like x 1
  3. MWB

    MWB Drive it like you stole it!! Gold Contributor

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    My Motion Simulator:
    2DOF, DC motor, Arduino, Motion platform, 4DOF, 6DOF
    Well its bin a little wile since my last update, Works been getting in the way, but I'm happy to say that I've managed to find some time to work on my rig!:thumbs

    So the main upgrades are two new front motors that are 200 watt and I've got the rear motors now working.
    IMG_4891.JPG
    • Like Like x 3
  4. MWB

    MWB Drive it like you stole it!! Gold Contributor

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    My Motion Simulator:
    2DOF, DC motor, Arduino, Motion platform, 4DOF, 6DOF
    • Like Like x 2
  5. MWB

    MWB Drive it like you stole it!! Gold Contributor

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    My Motion Simulator:
    2DOF, DC motor, Arduino, Motion platform, 4DOF, 6DOF
    • Like Like x 4
  6. MWB

    MWB Drive it like you stole it!! Gold Contributor

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    My Motion Simulator:
    2DOF, DC motor, Arduino, Motion platform, 4DOF, 6DOF
    • Like Like x 3
  7. MWB

    MWB Drive it like you stole it!! Gold Contributor

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    My Motion Simulator:
    2DOF, DC motor, Arduino, Motion platform, 4DOF, 6DOF
    So I'm very happy with my progress, the traction loss is incredable!!! :grin
    But I have a question about Simtools @yobuddy, because my motion is coming from a cam, the motion is not linear.
    NonlinChar.png
    The mid range of motion is faster than the top or bottom, is there a way of tuning this out in Simtools? :cheers
    Last edited: Apr 24, 2017
  8. Tim McGuire

    Tim McGuire "Forever a work in progress"

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    My Motion Simulator:
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    I'm not Yobuddy but from what I know there's not a way to tune it out. Instead we generally limit the rotation of our motors to around +/-45 degrees or so, so that it's "approximately linear", at least enough such that we don't notice.
    • Like Like x 1
  9. MWB

    MWB Drive it like you stole it!! Gold Contributor

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    My Motion Simulator:
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    Ok thanks Tim:thumbs
  10. momoclic

    momoclic Active Member

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    My Motion Simulator:
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    La solution pour assurer une symétrie de mouvement est ce type de montage quand la manivelle est à la position moyenne :

    The solution to ensure a symmetry of movement is this type of assembly when the crank is in the average position:
    upload_2017-4-25_10-56-13.png
    De plus on à tout intérêt à n'utiliser que 120° de rotation pour la manivelle, on gane 1/3 de réactivité en ne perdant que 14% de la course totale.
    Moreover, it is of interest to use only 120 ° of rotation for the crank, one gan 1/3 of reactivity while losing only 14% of the total stroke.

    Voici l'image d'un montage optimal pour un 4DOF de ce type, bielle à l'intérieur et montage assurant la symétrie de monuvement :
    Here is the image of an optimal mounting for a 4DOF of this type, Connecting rod inside and mounting ensuring the symmetry of movement:
    upload_2017-4-25_11-8-6.png
    Notez le triangle rouge orienté vers l'arrière qui rend le simulateur plus compact.
    Note the red triangle oriented rearwardly making it more compact simulator.
    • Like Like x 2
  11. DonCorleonez

    DonCorleonez Member

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    @MWB nice looking sim you have.
    I am interested with wheelchair motor maybe for next project. Quite cheap from ebay.
    How much is weight per motor?i am wandering is it still cheaper option after adds shipping
    • Like Like x 1
  12. RandomCoder

    RandomCoder Active Member Gold Contributor

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    @yamaha you are spamming the forum this is your 16th post on as many minutes. If you took a little longer to search you may find the answers your looking for!
    • Like Like x 1
  13. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator SimTools 2.0 Beta Tester

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    My Motion Simulator:
    3DOF, DC motor, JRK
    You are in a hurry to get banned, all you are doing is cluttering member threads and making work for the admins who will clean it up.
    • Agree Agree x 2
  14. MWB

    MWB Drive it like you stole it!! Gold Contributor

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    Hi DonCorleonez,

    Without taking one of the motors off my rig and weighing I can only estimate, so I would say around two and a half Kg per motor, although when I purchased my motors the postage was free.
    Things to look out for in my experience, if you go for 24v motors you won't pull as much current, also try if you can to go for 200w ones. And you will need to think about cooling them. I've just fitted some fans to mine. :thumbs
    • Like Like x 1
  15. MWB

    MWB Drive it like you stole it!! Gold Contributor

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    My Motion Simulator:
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    Thanks @momoclic,
    I've got some tweaking to do!!! :thumbs
  16. MWB

    MWB Drive it like you stole it!! Gold Contributor

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    My Motion Simulator:
    2DOF, DC motor, Arduino, Motion platform, 4DOF, 6DOF
    So even though I've uprated my front motors, there still getting a little hot, and in an effort to try not over-engineer a fix, I decided to use my 3D printer to make a fan cowling that bots onto the back of the motor and produces a high speed micro blanket of air across the body of the motor, trial and error no math!!!
    IMG_5003.JPG
    • Creative Creative x 1
  17. MWB

    MWB Drive it like you stole it!! Gold Contributor

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    My Motion Simulator:
    2DOF, DC motor, Arduino, Motion platform, 4DOF, 6DOF
  18. MWB

    MWB Drive it like you stole it!! Gold Contributor

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    My Motion Simulator:
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    So I put my 3D printer to work.
    IMG_4977.JPG
    IMG_4989.JPG
    IMG_4990.JPG
    IMG_4992.JPG
    • Like Like x 2
    • Creative Creative x 1
  19. MWB

    MWB Drive it like you stole it!! Gold Contributor

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    My Motion Simulator:
    2DOF, DC motor, Arduino, Motion platform, 4DOF, 6DOF
    I ended up increasing the outer diameter by 2mm to increase the flow across the motor body, but all in all I'm very happy with the results, the front motor that is seeing a little bit more weight than the other was getting very hot, but now after two hours of Dirt Rally the body of the motor was only at 38C. May need to drill some holes into one end of the motor, in order to get some air to the internals because I get the impression that it's still very hot internally. IMG_4993.JPG

    IMG_4994.JPG
    IMG_4995.JPG
    IMG_4996.JPG
    IMG_5001.JPG
    • Like Like x 1
  20. SilentChill

    SilentChill Problem Maker SimTools 2.0 Beta Tester

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    My Motion Simulator:
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    As soon as you still a couple of exhaust holes in you will be amazaded how much cooler they will run.
    • Like Like x 1