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OCSM Sim (2dof + traction loss) project

Discussion in 'DIY Motion Simulator Projects' started by Overclockersmania.it, Feb 15, 2015.

Page 3 of 7
  1. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    It is not unusual to tune the PID to suit each motor, as one can be a little stronger than the other.

    Stick with the shortest CTC for now.

    Can you please post all settings for the JRK and SimTools.
    noorbeast, Jun 4, 2015
    #41
  2. bsft

    bsft

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    Shorten the levers for a start, I can see motors struggling
    make them say 40mm CTC and try again
    bsft, Jun 4, 2015
    #42
  3. Overclockersmania.it

    Overclockersmania.it Member

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    My Motion Simulator:
    2DOF, 3DOF, DC motor, Arduino, Motion platform
    Thanks guys!
    I will use the shortest CTC position to avoid this problem. Then I will upload a new video.
    Also, I will post my PID settings later although I'm not using JRKs but MotoMonsters.

    Marco :cheers

    PS: talking about new motors, I've found on Alibaba.com motors that seem similar to those from motiondynamics.com, attached are the specs.
    What do you think?

    Attached Files:

    Overclockersmania.it, Jun 5, 2015
    #43
  4. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    Yes those motors do have similar specs to the ones from Motion Dynamics. Would you mind posting the Alibaba.com link, I am sure there will be members who would be interested.
    noorbeast, Jun 5, 2015
    #44
  5. Overclockersmania.it

    Overclockersmania.it Member

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    My Motion Simulator:
    2DOF, 3DOF, DC motor, Arduino, Motion platform
    Overclockersmania.it, Jun 5, 2015
    #45
  6. bsft

    bsft

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    90 amps stall current! good luck!
    bsft, Jun 5, 2015
    #46
  7. Overclockersmania.it

    Overclockersmania.it Member

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    My Motion Simulator:
    2DOF, 3DOF, DC motor, Arduino, Motion platform
    bsft could you please tell me how much should be the stall current for the Motion Dynamics motors?
    I cannot find this spec on their website and I think I've read somewhere you used this motors..Am I right?

    Thanks in advance
    Overclockersmania.it, Jun 5, 2015
    #47
  8. Overclockersmania.it

    Overclockersmania.it Member

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    My Motion Simulator:
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    Nothing sorry I've found the pdf reporting all the specs!

    Attached Files:

    Overclockersmania.it, Jun 5, 2015
    #48
  9. bsft

    bsft

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    Rated current 16 amps
    Stall current 32 amps, it says that on the sheet
    But we stall them up to 45 amp spikes no problem, put a fan on the motor to keep it cool
    bsft, Jun 5, 2015
    #49
  10. Overclockersmania.it

    Overclockersmania.it Member

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    My Motion Simulator:
    2DOF, 3DOF, DC motor, Arduino, Motion platform
    Hi all guys!
    I'm back with the same old unfortunate problem..
    I would like to discuss with you about the strange behaviour my actual motors and electronics are showing me.
    Maybe my last video and description of the problem wasn't so clear, thus I've updated another clearer video (I hope) to show it.
    Here's the link .

    To show you how the motors turn on and off I've directly connected the blue lamp to the same 12V which supplies the two MotoMonsters for one motor.
    As you can see, there's a time when the lamp blinks and turns off that means (I suppose) that the PSU isn't giving any electrical power.
    Again, I cannot understand what causes this behaviour. Should I focus on the stall current only?
    At the time I took this video the CTC was just 3.5 cm.

    Thanks again for your precious opinion guys!
    Marco:cheers
    Overclockersmania.it, Jul 9, 2015
    #50
  11. Alexey

    Alexey Well-Known Member

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    My Motion Simulator:
    3DOF, DC motor, Arduino
    What are your power supplies rated to?
    Alexey, Jul 10, 2015
    #51
  12. Overclockersmania.it

    Overclockersmania.it Member

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    My Motion Simulator:
    2DOF, 3DOF, DC motor, Arduino, Motion platform
    Thanks For your reply!
    I forgot to say they are two 1200W PSUs, which should give 100Amps of maximum current!
    Overclockersmania.it, Jul 10, 2015
    #52
  13. Alexey

    Alexey Well-Known Member

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    My Motion Simulator:
    3DOF, DC motor, Arduino
    Are they server PSU? Have they been modded to enable maximum current output (there's something like a power enable pin that needs 5V) ? If you have done the mod then all I could say is that the power supply might be going into protection mode. It's better to go with high power LED supplies in that case because they are "dumb" supplies and don't get picky during current spikes.
    Alexey, Jul 10, 2015
    #53
  14. Overclockersmania.it

    Overclockersmania.it Member

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    My Motion Simulator:
    2DOF, 3DOF, DC motor, Arduino, Motion platform
    No I haven't modded them.
    I didn't know, this is the first time I've heard of this modification.

    Thanks a lot that's a huge suggestion. It's definitely worth of a try. I will check myself if I can find how to mod the psu. Anyway if you already have a link or something useful..

    thanks again
    Marco
    Overclockersmania.it, Jul 10, 2015
    #54
  15. Alexey

    Alexey Well-Known Member

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    My Motion Simulator:
    3DOF, DC motor, Arduino
    The modification only needs to be done if it is a PC/Server power supply. If that is what you have then I need to know the model number of the PSU. Sometimes the required information can be hard to find so hopefully there is something out there that shows the pinouts.
    • Agree Agree x 1
    Alexey, Jul 10, 2015
    #55
  16. Overclockersmania.it

    Overclockersmania.it Member

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    My Motion Simulator:
    2DOF, 3DOF, DC motor, Arduino, Motion platform
    It is a server PSU, specifically this one: HP DPS 1200 FB A PROLIANT DL580 G5..
    Overclockersmania.it, Jul 10, 2015
    #56
  17. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    • Like Like x 1
    noorbeast, Jul 10, 2015
    #57
  18. Alexey

    Alexey Well-Known Member

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    My Motion Simulator:
    3DOF, DC motor, Arduino
    [​IMG]
    Note that there are actually 3 pins shown here being linked to ground. Pins 36 and 37 are linked to the same resistor.
    • Like Like x 1
    • Informative Informative x 1
    Alexey, Jul 11, 2015
    #58
  19. Alexey

    Alexey Well-Known Member

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    My Motion Simulator:
    3DOF, DC motor, Arduino
    [​IMG]
    This one only shows these two pins being linked, whichever mod works.
    • Like Like x 1
    Alexey, Jul 11, 2015
    #59
  20. Overclockersmania.it

    Overclockersmania.it Member

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    My Motion Simulator:
    2DOF, 3DOF, DC motor, Arduino, Motion platform
    guys thanks a lot! this really solved lots of problems I had!
    • Like Like x 1
    Last edited: Jul 15, 2015
    Overclockersmania.it, Jul 13, 2015
    #60
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