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Some basic questions for a N00b Motion sim builder

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by elnino, Aug 15, 2018.

  1. elnino

    elnino Active Member

    Joined:
    Apr 1, 2010
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    227
    Occupation:
    Computer Geek
    Location:
    Adelaide, Australia
    Balance:
    1,439Coins
    Ratings:
    +131 / 1 / -0
    My Motion Simulator:
    2DOF, DC motor, Arduino
    Hi All, A long time ago I built my sim. Custom pedals, shifter etc and always intended to go to a motion setup but I have not really done anything with it in 5 years.

    I did however collect some BIG DC motors for adding motion. In reality they are probably too big but it seemed like a good idea at the time and the theory was to motion the whole existing rig (not just the chair).

    The motors I got were off of a wheelchair (I even have the controller for it too). 24v DC rated motors and should have lots of torque as they are geared but they do seem to pull a lot of amps.

    I am really not sure on what H Bridge controller to use on them (I don't think I can utilize the chair controller but it has 4 X 70A Fets for each side of the H Bridge in it!!). I have seen these '100A H Bridge' modules on Ali etc - Are they any good? Its not clear on what chips/FETS are used on them or if that is 100A total or 100A per channel. Could I bridge them like the MM modules and use one per motor?

    I have 2 X 1000W HP Server power supplies to be able to power the motion.

    The other thing I was wondering about was the physical/mechanical connections - From what I have seen, most motors are connected to the back of the seat, whereas I was thinking I would just have them effectively controlling a flat platform that I could mount the whole existing SIM on (3 point, 2DOF). Is there any reason NOT to do this?

    Really looking forward to some motion finally!
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

    Joined:
    Jul 13, 2014
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    20,461
    Occupation:
    Innovative tech specialist for NGOs
    Location:
    St Helens, Tasmania, Australia
    Balance:
    144,602Coins
    Ratings:
    +10,741 / 52 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    • Agree Agree x 1
  3. Grigory

    Grigory Active Member Gold Contributor

    Joined:
    Jul 6, 2016
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    202
    Location:
    Moscow
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    212Coins
    Ratings:
    +304 / 1 / -0
    My Motion Simulator:
    3DOF, 6DOF
    I agree, Sabertooth 2x60 is perfect for controlling large 24V motors. I have tested it with huge and current-hungry NPC-T74 motors on both 3 DOF (seat mover + traction loss) and 6DOF -- without any issue on the Sabertooth side.