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$450 Mige Direct Drive Wheel using MMOS and AASD

Discussion in 'DIY peripherals' started by Peacemaker105, May 6, 2020.

Page 8 of 25
  1. Burgunder

    Burgunder New Member

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    I think that a smaller wheel would weigh around 800 grams so this is +50% and the rim is rather large which means more weight long from the centre.
    Burgunder, Jun 16, 2020
    #141
  2. Burgunder

    Burgunder New Member

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    I found this post to back to previous
    claims ;)
    Burgunder, Jun 16, 2020
    #142
  3. Burgunder

    Burgunder New Member

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    Burgunder, Jun 16, 2020
    #143
  4. Datch

    Datch New Member

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    Hi! I've recorded video with strange sound of my servo. Can't understand how to make it quite.
    Sounds like shaft is scrubbing something inside, but only when wheel is accelerating fast.
    Did somebody face same thing?
    Datch, Jun 16, 2020
    #144
  5. Gadget999

    Gadget999 Well-Known Member

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    My Motion Simulator:
    2DOF, DC motor, Arduino, 6DOF
    my guess it is the coils inside the motor vibrating with higher current

    does it do it when you are driving ?
    Gadget999, Jun 17, 2020
    #145
  6. Thanos

    Thanos Building the Future one AC Servo at a time... or 6

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    My Motion Simulator:
    AC motor, Motion platform, 4DOF, 6DOF
    That squeak noise is the braking function of the servo, when its limiting the max RPM on Torque mode.

    You could eliminate it by increasing the max RPM, but then it might accelerate to lots of RPM much more than a rim could handle, especially if using unbalanced rim. Have the e-stop in close proximity just in case...
    • Like Like x 1
    • Informative Informative x 1
    Thanos, Jun 17, 2020
    #146
  7. Datch

    Datch New Member

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    Max RPM is set to 2500 and the noise shows only on start of acceleration.
    Datch, Jun 17, 2020
    #147
  8. sedesa tatasa

    sedesa tatasa Member

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    Confirm that Pn187 is 1.
    Try setting Pn188 to 50.
    sedesa tatasa, Jun 17, 2020
    #148
  9. Datch

    Datch New Member

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    I've set these values when I first time set up the wheel. So video is recorded with same values.
    Datch, Jun 17, 2020
    #149
  10. sedesa tatasa

    sedesa tatasa Member

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    If Pn188 is set to 200 or 1,
    Is there any change in noise on start of acceleration?
    sedesa tatasa, Jun 17, 2020
    #150
  11. Datch

    Datch New Member

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    No, noise is equal when Pn188 is set to 1 or 200.
    Datch, Jun 17, 2020
    #151
  12. sedesa tatasa

    sedesa tatasa Member

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    What is the value of PN189?
    I think the torque will be limited if the torque command exceeds 300%.
    sedesa tatasa, Jun 17, 2020
    #152
  13. Datch

    Datch New Member

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    Pn189 is set to 120. But with just 20 I've got the same results, may be noise is slightly quieter than 120.
    Datch, Jun 17, 2020
    #153
  14. sedesa tatasa

    sedesa tatasa Member

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    Can you do a Jog test?
    sedesa tatasa, Jun 17, 2020
    #154
  15. Datch

    Datch New Member

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    Yes I can, if you give me some instructions.
    Datch, Jun 17, 2020
    #155
  16. sedesa tatasa

    sedesa tatasa Member

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    • Informative Informative x 1
    sedesa tatasa, Jun 17, 2020
    #156
  17. Datch

    Datch New Member

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    Datch, Jun 17, 2020
    #157
  18. Datch

    Datch New Member

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    Hmm. Ok, I've found that if I set Pn198 to 500 instead of 120 this sound becomes much quieter so I've made Pn189 = 80 and now there is no noise and wheel spins very fast. Thanks!
    • Useful Useful x 1
    Datch, Jun 17, 2020
    #158
  19. TedBrosby

    TedBrosby New Member

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    My Motion Simulator:
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    @Peacemaker105 hi!
    So now that you've been using this for a while, did you manage to get the humming and oscillation fixed with @Thanos PCB and DAC solution?
    I'm wondering how the wheel base is going now that it's been a little while since you assembled it.
    • Like Like x 1
    TedBrosby, Jun 18, 2020
    #159
  20. Thanos

    Thanos Building the Future one AC Servo at a time... or 6

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    My Motion Simulator:
    AC motor, Motion platform, 4DOF, 6DOF
    There is no humming or oscillation when using the DAC...

    Making some smaller TDD boards actually...

    IMG_20200618_171517.jpg

    IMG_20200618_171451.jpg

    IMG_20200618_171533.jpg

    IMG_20200618_171614.jpg
    • Like Like x 4
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    Thanos, Jun 19, 2020
    #160
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