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Arduino: noisy motors while not moving? Why?

Discussion in 'Motor actuators and drivers' started by AlexinChina, Dec 16, 2015.

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  1. Pit

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

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    Anyway your comment should refer to the header "noisy motors while not moving? Why?". De facto less amperage makes the motors less noisy but it is not the goal to reduce the amperage because of less power/torque at least. We have many non native speaking members like me and Google translate is a good thing, but you should not post one after another post writing senseless content...thank you.
    Pit, May 24, 2016
    #21
  2. traveltrousers

    traveltrousers Active Member

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    This isn't a high speed PWM problem is it?
    traveltrousers, May 17, 2017
    #22
  3. Pit

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

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    What do you mean, could you be more precise?
    Pit, May 17, 2017
    #23
  4. traveltrousers

    traveltrousers Active Member

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    traveltrousers, May 18, 2017
    #24
  5. Pit

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

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    As expected, the vnh5019 is a whiny motor driver, and I'm not kidding. I did several tests, I couldn't eliminate any whining only if reducing the kp value or as you did the pwmmax value. Unfortunately there is no solution in sight.
    Pit, May 18, 2017
    #25
  6. traveltrousers

    traveltrousers Active Member

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    The VNH509 isn't noisy, its the PWM source. I didn't reduce the pwmmax, I switched my Arduino to fast PWM code and the whining is gone.

    I use firmata on my arduino and two lines fix it for my nano on pins 9,10 and 11

    void setup()
    {
    TCCR1B = TCCR1B & B11111000 | B00000001;
    TCCR2B = TCCR2B & B11111000 | B00000001;
    etc etc

    this is the best site to work it out:

    https://arduino-info.wikispaces.com/Arduino-PWM-Frequency
    • Informative Informative x 1
    traveltrousers, May 18, 2017
    #26
  7. Pit

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    @BlazinH @RufusDufus @vthinsel @Wanegain @eaorobbie ...any comments about this?
    Pit, May 18, 2017
    #27
  8. traveltrousers

    traveltrousers Active Member

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    shows a short but useful demo.... my drivers would whine as soon as they powered up with a zero pwm input
    traveltrousers, May 18, 2017
    #28
  9. RufusDufus

    RufusDufus Well-Known Member

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    Yes that is what gets changed when adjusting Fpwm using SMC3Utils. Check out InitialisePWMTimer1 and InitialisePWMTimer2 in SMC3

    Your values will be getting overwritten if you put that code at the top of the setup() function unless you have removed the call to initialise timers.

    Note also the value you have chosen is outside the spec for almost all H-Bridges, it might work OK but not guaranteed so I have not included it as an option in SMC3Utils otherwise I will get too many questions of fault finding.

    EDIT: this assumes you are using SMC3 code of course
    • Informative Informative x 1
    RufusDufus, May 20, 2017
    #29
  10. RufusDufus

    RufusDufus Well-Known Member

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    Also try setting Fpid/8 or more to see if that helps.
    RufusDufus, May 20, 2017
    #30
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