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motors have noise in middle position

Discussion in 'Motor actuators and drivers' started by mimakez, Jan 10, 2016.

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  1. mimakez

    mimakez Member

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    Hi,
    I made a simulator modeled on RacingMat 2 dof wiper and I use 10k cermet pots.I use RacingMat arduino code and settings. Simulator work great but when the simulator returns to its initial position after the race I hear noise from motors ( sometime left motors, sometime right motor, sometime both motors have noise). when I go after driving in simtools / game engine / output testing / axis output and manually move the slider axis1 and axis2 left / right and back to zero position then the engines stop to the noise.
    if someone had a similar problem and how to solve?
    thanks in advance
    mimakez, Jan 10, 2016
    #1
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    Can you post a video of the motors making the noise, that would help a lot with troubleshooting.
    • Agree Agree x 1
    noorbeast, Jan 10, 2016
    #2
  3. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
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    I would say it is noise on the feedback line, try installing suitable capacitors on the active feedback line to earth. - It has been talked about before - try searching the site for the thread.
    • Agree Agree x 1
    SeatTime, Jan 10, 2016
    #3
  4. mimakez

    mimakez Member

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    mimakez, Jan 10, 2016
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  5. mimakez

    mimakez Member

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    Thx, I try with capacitors
    mimakez, Jan 10, 2016
    #5
  6. pipis2015

    pipis2015 over-boost

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    how much of the travel of your potentiometers are you using?
    180 degrees?

    if so then you can increase the tollerance value in the arduino scetch from 20 to 30.


    the line in the code goes like this:

    int Tol=20

    change it to 30... save.... upload.... and see if it solves your problem(it probably will).
    • Informative Informative x 1
    pipis2015, Jan 10, 2016
    #6
  7. Pit

    Pit - - - - - - - - - - - - - - - - Gold Contributor

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    Pit, Jan 10, 2016
    #7
  8. mimakez

    mimakez Member

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    Hi @pipis2015 I change int Tol to 30 and I have same problem. whether to try running with a 40 or 50?
    mimakez, Jan 11, 2016
    #8
  9. pipis2015

    pipis2015 over-boost

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    My Motion Simulator:
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    You can try 40 or 50.

    It is 40 out of 1024 values of the analog to digital converter.

    So your simulator gets 1% less responsive every time you increase the tolerance by 10.

    How much is your pot travel?
    pipis2015, Jan 11, 2016
    #9
  10. mimakez

    mimakez Member

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    My Motion Simulator:
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    My pots travel around 75 degrees up and 75 degrees down. I use this code.

    Attached Files:

    mimakez, Jan 11, 2016
    #10
  11. pipis2015

    pipis2015 over-boost

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    My Motion Simulator:
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    If you use racingmats code you should be OK with a tolerance value between 20 and 30.

    so stay with 30 and change this part to ease on the jitter.

    from this:
    if (gap>50) pwm=215;
    if (gap>75) pwm=235;
    if (gap>100) pwm=255;
    to this:
    if (gap>50) pwm=225;
    if (gap>100) pwm=230;
    if (gap>150) pwm=235;
    if (gap>200) pwm=240;
    if (gap>250) pwm=245;
    if (gap>300) pwm=250;
    • Informative Informative x 1
    pipis2015, Jan 11, 2016
    #11
  12. mimakez

    mimakez Member

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    I write this in code, everything works fine but I still have after the game to move the slider axis1 or axis 2 or sometimes both at -2% and then be all right. if I do not then I hear the noise of motors.
    mimakez, Jan 11, 2016
    #12
  13. pipis2015

    pipis2015 over-boost

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    what voltage are you running your motors with?
    12volt or 24 volt?
    pipis2015, Jan 11, 2016
    #13
  14. mimakez

    mimakez Member

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    12volt
    mimakez, Jan 11, 2016
    #14
  15. pipis2015

    pipis2015 over-boost

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    are you using the ultrasonic code? or the standard code?
    pipis2015, Jan 11, 2016
    #15
  16. mimakez

    mimakez Member

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    I use standard code
    Last edited: Jan 11, 2016
    mimakez, Jan 11, 2016
    #16
  17. pipis2015

    pipis2015 over-boost

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    • Informative Informative x 1
    pipis2015, Jan 11, 2016
    #17
  18. Pit

    Pit - - - - - - - - - - - - - - - - Gold Contributor

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    • Like Like x 1
    Pit, Jan 11, 2016
    #18
  19. mimakez

    mimakez Member

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    yes, I try ultrasonic code but something not good. when I put ultrasonic code only axis1 work with strange vibrations. I must see what is wrong.
    mimakez, Jan 11, 2016
    #19
  20. pipis2015

    pipis2015 over-boost

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    racingmats' ultrasonic code does not work with all h-bridges (if you have monstermoto it should work).

    this is as far as i can help.

    I didnt find any thread with your project.

    If you can ... create a thread to present your simulator and post some pictures and specifications of the parts so others who have similar constructions can help you.
    • Agree Agree x 2
    pipis2015, Jan 11, 2016
    #20
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