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3 DOF DCS Oculus Rift motion platform project

Discussion in 'DIY Motion Simulator Projects' started by dureiken, Oct 17, 2016.

  1. dureiken

    dureiken Member

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    Hi there,

    just starting a new thread, to have some help and to help further simmers :)

    The wish

    1-Use with Oculus Rift, mainly for DCS sim
    2-Use AC motors
    3-Add a g-seat seat next year if possible !

    Starting the project (2016-10-17)
    Motor : 3*1.1KW AC 23rpm 311Nm, used on 120° not 180°
    Lever : 20cm which means +/- 17.5cm for 120°
    Angle : 17°
    Linear speed : 0.3m/s minimum
    Acceleration : 2g minimum

    My first drawing (it's really bad compared to others xsimers but it's just to make good choices for design and kinetics) :

    [​IMG]

    I have 3 big questions before going on my project :

    1-Am I in the good way/choices ? :)

    2- I'm really hesitating between these 2 motors/levers lenght

    [​IMG]

    they have near the same linear speed and momentum, but one will have 16cm for heave, the other 35cm

    the first one will have 749W and the second one 903W for both 1.1kW input.

    For 18° angle, pivot points with 8 cm lever

    [​IMG]

    and 20cm lever

    [​IMG]

    3-what will be the current during the use of motors ? because it's 6time higher at starting, which makes 86A ???
    Will there be at all time 86A because motors are always changing direction ??

    Thanks a lot !!
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    Last edited: Oct 17, 2016
  2. dureiken

    dureiken Member

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  3. dureiken

    dureiken Member

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  4. misoswan

    misoswan Active Member

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    My Motion Simulator:
    3DOF, Arduino, JRK
    position on motros like your
    after one year. start change chair for this .
    It still is working on it

    Attached Files:

    • Like Like x 1
  5. dureiken

    dureiken Member

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    sounds awesome ! how does it feel ? motion brings a lot of immersion with VR ?

    just add some design with my motors/levers question :)

    thanks
  6. dureiken

    dureiken Member

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  7. speedy

    speedy Well-Known Member

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    My Motion Simulator:
    3DOF, AC motor, Arduino, Motion platform
    Sounds great ideas ...
    How can I help ?
  8. dureiken

    dureiken Member

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    Thanks.

    I asked some questions on Fp. Specially about intensity

    Thanks
  9. sasystem

    sasystem New Member

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    My Motion Simulator:
    2DOF
    I'm new here but surely they'll tell you 23rpm is very slow. :nerd
  10. speedy

    speedy Well-Known Member

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    My Motion Simulator:
    3DOF, AC motor, Arduino, Motion platform
    Motors current will be written on the motor's name plate and for a [ 1.5HP=1.1KW ] AC motor it will never exceed 3-4 Amps

    .5HP.jpg 555.jpg

    when using VFD inverters it will be programmed to give you an S curve for holding a constant torque while forward/reverse/low RPM ... and it will automatically maintain the motor current for not overheating or damaging its coils ...
    • Informative Informative x 2
    Last edited: Oct 25, 2016
  11. cthiggin

    cthiggin Active Member

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    My Motion Simulator:
    3DOF, AC motor, Arduino, Motion platform
    other than the expense, I love my AC setup...........
    With my friend @speedy helping me immensely, my motors work just great and after an hour's use, are barely warm.

    Tom
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  12. BlazinH

    BlazinH Well-Known Member

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    For comparison purposes I use 600watt 12vdc motors and at stall they pull 135amps each. In usage though my clamp meter that has a hold function shows a max draw of 90amps. Mine are 68rpm though.
  13. paulg100

    paulg100 Member

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    My Motion Simulator:
    AC motor, 6DOF
    im running 6x 1.1kw AC each through its own 20amp MCB which then all goes through a 40amp RCD.

    No problems with tripping yet.

    the max current on the motor plate is the 3phase current, if you have single phase going into the inverter then as a rough guide you can say it will pull 3 x as much at the single phase side during stall.

    TBH if your motors are stalling then theres something seriously wrong with the platform, you should never get close to that.

    The first motor you listed has way more torque which you will need depending on the weight of the platform/cockpit you plan to use, if you are going to use the platform mainly for flight sims then the speed will be fine.

    personally if i was starting a build now id be looking at the linear actuator route that others here are taking. Cuts out the gears and VFD's. You get direct drive linear motion which is going to be more responsive and more detailed.... and its cheaper!
    Last edited: Oct 26, 2016
  14. dureiken

    dureiken Member

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    why it would be very slow ? it just depends on the lever length for linear speed ?

    ok thanks :)

    where is your project ? :) to compare and take some ideas

    do you have good links for linear ?

    I won't have cockpit, just Oculus Rift and hotas, maybe a gseat after. I go with 150kg pltaform, and acceleration is given with this weight in table in FP.

    What is MCB and RCD ?

    BTW thanks all for replaying :)
  15. paulg100

    paulg100 Member

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    My Motion Simulator:
    AC motor, 6DOF
    MCB: miniature circuit breaker
    RCD: residual current device

    "do you have good links for linear"

    all the projects are on here
  16. speedy

    speedy Well-Known Member

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    My Motion Simulator:
    3DOF, AC motor, Arduino, Motion platform
    Feeling sorry for you adopting this DC amps. HUGRY beast ...
  17. speedy

    speedy Well-Known Member

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    My Motion Simulator:
    3DOF, AC motor, Arduino, Motion platform
    It is really easy @dureiken to reverse calculate the max rpm required on the gearbox shaft ...

    For ex. If you want at any point of a 3DOF 1m. Equal sides Triangle base a linear speed of 30cm/sec. and a travilling distance of 20cm up and down ...

    1- You'll use a 10cm CTC "center to center" crank arm lever that will rotat a 180 degree to get the 20cm up/down displacement ...

    2- then caculate everything normally and multiply the resulting rpm by 1.5 to get the 30 cm/ sec. linear speed ...

    So ...

    [ 180deg./sec * 2 ] = 1 revolution/ 2sec = 15 revolution / minute

    The min. required RPM will be = 1.5 * 15 = 22.5 RPM
    • Informative Informative x 2
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  18. dureiken

    dureiken Member

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    Yes thanks but why are you talking about this ? my first table shows all these calculs, for different levers and 120° rotation of gearbox (not 180)
    [​IMG]
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  19. speedy

    speedy Well-Known Member

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    My Motion Simulator:
    3DOF, AC motor, Arduino, Motion platform
    Yes sure I saw that :) ... but you just didn't explain how you got these values ??? ... and it felt like it has been copied and you're not sure af what you need .

    More detailes are always welcomed .:cheers
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  20. dureiken

    dureiken Member

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    They are not copied from anywhere, just made by myself

    I took an angle of 120° not 180° for full amplitude on a motor, and I used different lever lenght to found linear speed and acceleration.
    • Like Like x 1