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Questions regarding first 2DOF

Discussion in 'DIY Motion Simulator Projects' started by mueller13s04, Dec 29, 2024.

  1. mueller13s04

    mueller13s04 New Member

    Joined:
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    Hey guys, I am new here but I really love the effort everyone is putting in.

    Short background:

    I have some experience with electronics and software engineering.
    The questions might sound stupid to you but I have looked everywhere and I thought it was easier to just ask :)

    I am planning on building my first rig in 2025 and i obviously dont have as much experience as you all.

    I was planning on using some 24v 250w wheelchair motors, because that seems to be the "easiest" choice as a beginner. I have looked into the powersupplies and I found a few cheap ones that are rated for 600w and 25a at 24v for just under 40 Euros.
    Would that work for 2 motors because I dont think I can get server psus much cheaper and also I want to keep it as simple as possible.


    I understand that I need some kind of protection against the backcurrent from the motors, in case of extreme braking or other movements.
    What I dont understand is, why you are using bridge diode rectifiers.
    Dont they just convert the current?

    My other question is:

    is PGmover an alternative to Simtools or do they extend one another?
    Everybody seems to be using Simtools, but I really dont want to spend 80 Euros for a license if I can use a different tool for free :)
    I downloaded PGmover and looked into the documentation but I cant find the answer I am looking for:
    can I set up my whole rig and configure it using PGmover?

    I would really appreciate a short answer.

    Have a great 2025

    Greetings from Germany
    mueller13s04
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

    Joined:
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    Innovative tech specialist for NGOs
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    St Helens, Tasmania, Australia
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    148,880Coins
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    +10,922 / 54 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    Reading on from here you will find an interesting discussion re bridge diode rectifiers, though as it notes many including some commercial rigs don't use them: https://www.xsimulator.net/communit...flypt-transducers-controls.19053/#post-251304

    SimTools and FlyPT mover take different approaches toward motion simulation, yes you could use the latter, it is a bit of a steep swan dive so do check out the FAQs and related documentation and threads: https://www.xsimulator.net/community/faq/flypt-mover.29/category
    • Like Like x 1
  3. mueller13s04

    mueller13s04 New Member

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    Thank you very much. I will take a look at it. Would you suggest I should use one over the other as a beginner (SimTools or FlyPT)?
  4. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

    Joined:
    Jul 13, 2014
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    Innovative tech specialist for NGOs
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    St Helens, Tasmania, Australia
    Balance:
    148,880Coins
    Ratings:
    +10,922 / 54 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    My suggestion would be to try both and see what suits you best. FlyPT is free and SimTools has the fully functional Live For Speed plugin included in the demo version. Cost is an obvious difference but so too is complexity, particularly with simple rigs.
  5. Joe Cortexian

    Joe Cortexian Member Gold Contributor

    Joined:
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    My Motion Simulator:
    3DOF
    The most important protections for the motors are limit switches and hard stops. They are a PITA to put together but in the end you’ll be happy to have them. Fuses and an estop are also pretty important although my current motors have never tripped a fuse.

    Worry about diodes and capacitors when things aren’t working. I attributed every startup problem I had to back EMF and so far not a single one was that.
  6. Attyla.pl

    Attyla.pl Active Member

    Joined:
    Oct 1, 2023
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    Location:
    Polska
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    My Motion Simulator:
    2DOF, DC motor, Arduino
    For reverse current protection, KBPC5010 diodes at the output of the power supply connected according to such a scheme will suffice:
    Power supply 24V connect to both AC pin , positive pin KBPC5010 connect to positive pin motor driver, negative pin KBPC5010 not used .
    More important is the choice of motor driver , with 24V power supply I do not recommend using IBT2 bridges are very unreliable and often burn out ,
    If you want to have a trouble-free platform, buy these bridges
    https://www.xsimulator.net/community/threads/reasonably-priced-100a-motor-controllers.17638/
    Yes I know they are more expensive but they are completely trouble-free I have 3 of them and they work with 24V 250W motors for a year without a problem.
    In addition, with the 100A bridge you can use an alternative software version for arduino with built-in soft start
    https://www.xsimulator.net/communit...rt-for-dofreality-h6-and-p.17630/#post-252481
    I recommend FlyPtmover as software to control the platform at the beginning is a bit confusing but you can understand how it works after a short learning, and the possibilities are huge :)
    Below is my 2DOF file for FlyPTmover version 3.5.3 (there is a newer version, but I'm waiting for major bugs to be fixed)
    Your rig is supposed to be more for car racing or flying?

    Attached Files: