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Motor Placement

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by Richard Eaton, Nov 20, 2023.

  1. Richard Eaton

    Richard Eaton Member

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    My Motion Simulator:
    2DOF
    Now I've sorted out my motors and everything is working it's time to begin the build, there are so many different designs out there but I'm just wondering what the general consensus is about if the motors should be sat behind the seat or more towards the pedal mount, this is 2dof rig.
    Richard Eaton, Nov 20, 2023
    #1
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    Innovative tech specialist for NGOs
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    My Motion Simulator:
    3DOF, DC motor, JRK
    It really depends on the design aim, but what needs to be kept in mind is the tradeoffs between design choices and physics, SimCalc can help with that: https://www.xsimulator.net/communit...e-linear-speed-and-forces-of-your-design.270/

    A compact design like my rig needs a good deal of torque and because it is moving the base the movement is amplified by the height of the seat. A shoulder mount seat shaker maximised inherent design leverage, and as it is only moving the seat minimises the mass, so is a good choice for weaker motors. A full frame shoulder or foot mount have good inherent design leverage, but be mindful of the mass. A knee mount is a bit of a compromise between a compact and either shoulder or foot mount full frame designs. All designs need to take inertia into consideration, so generally speaking it is a good idea to minimise top frame mass as much as possible, irrespective of what design is chosen.
    noorbeast, Nov 21, 2023
    #2
  3. Rosebomb

    Rosebomb Member Gold Contributor

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    My Motion Simulator:
    3DOF, DC motor, Arduino
    Mine are behind the seat. I left my plywood base a bit big so i could experiment with different ideas in the future.
    Rosebomb, Nov 21, 2023
    #3
  4. 90kgOver300m

    90kgOver300m Member

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    Like others have mentioned it depends on your rig design. I would recommend moving the motors to the furthest point away from the universal joint, whilst still staying within your desired footprint.
    90kgOver300m, Nov 24, 2023
    #4