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Thread: Variable Frequency Drive for a larger factory fan

  1. #11
    Supporting Member chy_farm's Avatar
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    chy_farm's Tools
    Thanks trigger, will keep your words in mind.

    Chy

  2. #12
    Supporting Member chy_farm's Avatar
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    chy_farm's Tools
    Schematic after the power unit is as follows;
    Variable Frequency Drive for a larger factory fan-pwm_r020319.jpg
    showing a LT-spice view, where the triangle, sine wave generators are replaced with a simple built-in parts of LT-spice.

    Output wave in LT-spice simulation (red lines), and a couple of real ones (oscilloscope views) here;
    Variable Frequency Drive for a larger factory fan-2020319_301-1-.jpg

    Variable Frequency Drive for a larger factory fan-2020319_302-1-.jpg

    Chy
    Last edited by chy_farm; 07-30-2020 at 08:50 PM.

  3. #13
    Supporting Member chy_farm's Avatar
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    chy_farm's Tools
    IGBTs, High Speed Diodes, and Output Filter Coils are placed in the metal shield room;
    Variable Frequency Drive for a larger factory fan-igbt_diodes_coils_1.jpg

    Variable Frequency Drive for a larger factory fan-igbt_diodes_coils_3.jpg

    Chy

  4. #14
    Supporting Member chy_farm's Avatar
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    chy_farm's Tools
    For an observation and study use, I added several kinds of carrier frequencies from 2kHz to 14.5kHz;
    Variable Frequency Drive for a larger factory fan-carrier_waves.jpg

    Chy

  5. #15
    Supporting Member chy_farm's Avatar
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    chy_farm's Tools
    Quote Originally Posted by trigger View Post
    Does the breadboard not contribute to rf noise ?Once the design goes to PCB there should not be so much interference.
    Trigger, I tried to recall my memory and some data on this, and here found a pic showing comparison between the two, before shield and after shield.
    Either case bread boards were already replaced with universal boards.
    Variable Frequency Drive for a larger factory fan-shield_effect.jpg

    Although the carrier wave was not very stable, I know the reason that the center common level was a tad off-set. the thicknesses of the sine waves tell the shield shows effect on it.

    This tell us that even PCB board wants some means for cutting noise.

    Chy
    Last edited by chy_farm; 07-30-2020 at 10:34 PM.

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    nova_robotics's Tools
    Quote Originally Posted by chy_farm View Post
    Good morning Nova, Why? ,,, only because I did not know other ways, lol. Do you make them in one Uno?
    Chy

    p.s. Glad to know you are a specialist of robotics, Nova!
    Shoot me your code. I can have a look at it if you want. Are you bit-banging the Arduino functions? Interrupts and PWM outputs are very, very nice when you get them set up. If you swapped the three Arduino Unos out for one Arduino Due you can definitely monitor current, frequency and temperature with a single board, but you could probably also generate your sine waves. Arduino Dues are very fast. There are also lots of other (and much faster) boards to choose from as well. If you're having frequency and noise issues driving it directly from a microcontroller might solve some oscillator problems.

    Again, awesome project and great work.

  7. #17
    Supporting Member chy_farm's Avatar
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    chy_farm's Tools
    Quote Originally Posted by nova_robotics View Post
    Shoot me your code. I can have a look at it if you want. Are you bit-banging the Arduino functions? Interrupts and PWM outputs are very, very nice when you get them set up. If you swapped the three Arduino Unos out for one Arduino Due you can definitely monitor current, frequency and temperature with a single board, but you could probably also generate your sine waves. Arduino Dues are very fast. There are also lots of other (and much faster) boards to choose from as well. If you're having frequency and noise issues driving it directly from a microcontroller might solve some oscillator problems.

    Again, awesome project and great work.
    Nova, thank you very much for your kindness.
    This information is very big for me, for years I have been learning C, but not yet graduate from a first grade though, lol.
    When I got to know Arduino, was a bit disappointed that it uses C++, which uses 'Class', this makes me mixed up and still I am loosing my way to restart learning.

    So this offer is very great to me! Perhaps you make me stand again and start again Nova. Will try posting the code and ask you for your information.
    Many thanks!!

    Chy

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    Carnel's Tools
    Hi Chy-Farm, Thanx for this extensive communication. Now I am curious about the IGBT circuit. And is 100V the standard grid voltage in Japan?

    regards, Carnel

  9. #19
    Supporting Member chy_farm's Avatar
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    chy_farm's Tools
    Quote Originally Posted by Carnel View Post
    Hi Chy-Farm, Thanx for this extensive communication. Now I am curious about the IGBT circuit. And is 100V the standard grid voltage in Japan?

    regards, Carnel
    Hi Carnel, yes! It's as low as 100V, lol. This makes us sometimes frustrated though.

    Chy

  10. #20
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    Thanks chy_farm! We've added your Factory Fan VFD to our Electronics category,
    as well as to your builder page: chy_farm's Homemade Tools. Your receipt:




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