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Showroom 2 Dof DC Motor Rig with Item Profile

Discussion in 'DIY Motion Simulator Projects' started by tombo, Jan 1, 2015.

Page 8 of 8
  1. tombo

    tombo Active Member

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    My Motion Simulator:
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    Hello,

    I am in the middle of converting my Simulator to a Seatmover. Since it is many years ago after I used it last, i have to setup everything new. I still use the same Controller with SMC3 (still V.06 on the Arduino) and the same motors.

    I am trying for 3 Days straight to get it working again. So far with mixed results.
    I have a hard time to set up the SMC 3 Parameters. On the way up, the motors are very smooth, but I get trouble when the motor is moving downwards.
    Its like the motor is overshooting, slows down for a moment and move back on.
    This gives me like a step motion downwards. What is the beste parameter to look into?
    tombo, Jan 16, 2026 at 11:24
    #141
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    Can you please post a picture of SMC3 running the Sine Test.
    noorbeast, Jan 16, 2026 at 11:26
    #142
  3. tombo

    tombo Active Member

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    Hello,

    i attached some screenshots. If i upp KP more than 200 it gets worse.

    Attached Files:

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    tombo, Jan 16, 2026 at 11:59
    #143
  4. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    Try setting Fpid to 1, Fpwm to 25 and Step to 1 then re-run and post the Sine test.
    noorbeast, Jan 16, 2026 at 12:10
    #144
  5. tombo

    tombo Active Member

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    Hello,

    changing the settings doesnt make a differenece. the motor moves like its going up and down stairs.
    on the picture nr.4 I moved the motor connection further away from the ujoint. This makes movement better. Maybe there is to much load on the Motor.

    Attached Files:

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    tombo, Jan 17, 2026 at 11:54
    #145
  6. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    Increasing the distance between the motor placement and the pivot reduces the load on the motor, as does shortening the CTC distance used on the levers, with the latter sometimes being easier depending on rig design.

    If you can also increase Kp and rerun the Sine test.
    noorbeast, Jan 17, 2026 at 12:26
    #146
  7. tombo

    tombo Active Member

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    I tried increasing kp, but this doesn't make it better. I think i first need a way to move the motors more far away from the joint, without new parts ^^
    tombo, Jan 17, 2026 at 12:35
    #147
  8. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    Try a shorter lever mounting hole first.
    noorbeast, Jan 17, 2026 at 12:37
    #148
  9. tombo

    tombo Active Member

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    Hello,we are on the right way i think :). Using a shorter mounting hole doesnt seem to make a difference. I moved the u joint further away from the Motor mounting axis, and it is getting better, but still not as good as it should be.

    I get much smoother movement now, and can increase KP to about 300. But still there are at least 2 noticable steps in the sign movement.

    Maybe i should update the smc firmware, or try some of the alternative smc firmwares

    Attached Files:

    • 5.PNG
      5.PNG
      File size:
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    tombo, Jan 17, 2026 at 17:54
    #149
  10. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    Glad you are making progress.

    As an aside, I expect PWMrev to be a lower value than PWMmax, having a sensible base guess is likely going to give better indicators during troubleshooting design and other issues.

    Can you plasee post pictures of your rig and specs of your motors, and can you please clarify if it has been properly balanced: https://xsimulator.net/community/faq/find-the-center-of-gravity-to-balance-a-motion-simulator.55/
    noorbeast, Jan 17, 2026 at 23:55
    #150
  11. tombo

    tombo Active Member

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    Sadly I have seen your post to late.
    Me and my friend tuned and raced the whole evening yesturday, and needed to move the Simulator to his home today. I will write him that he sends me some pictures.

    For the Motorspecs: We use the ZYT90 with MCP4 gearbox. The seat shout be leveled on the u joint. We did it as best we can.

    We have made some changes to the PID Values. We are now at KP=210, KI =1. This gives some nice movement. There is still room for improvement. But i noticed one Halleffeckt Potentiometer is moving a little bit hard, and was maybe damaged while we where testing the last week. This needs a propper replacement.

    On my old Platform rig there where some Gas dampfers installed, which we installed now at the seatmover which also improves the overall motion. But i think this should be replace with a slighlty higher Newton one.

    So far we have coinfigured the Sway and surge axis, and are nearly statisfyed with the result.
    There is one Issue i will try to explain.

    If you drive into a corner, the corner entrance (seat leaning opposite side) fells a little bit to harsh. The outgoing movemend out of the corner is nearly perfect. Is there a way to edit the movement independet from corner entrance and outcome?

    You can see a short video from yesturday here: https://www.youtube.com/shorts/1zQC85OYKa0
    tombo, Jan 18, 2026 at 17:51
    #151
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