Variable Frequency Drive for a larger factory fan

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Jul 30, 2020, 08:25 PM
chy_farm

Thanks trigger, will keep your words in mind.

Chy
Jul 30, 2020, 08:33 PM
chy_farm

3 Attachment(s)

Schematic after the power unit is as follows;
Attachment 36013
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;
Attachment 36014

Attachment 36015

Chy
Jul 30, 2020, 09:49 PM
chy_farm

2 Attachment(s)

IGBTs, High Speed Diodes, and Output Filter Coils are placed in the metal shield room;
Attachment 36016

Attachment 36017

Chy
Jul 30, 2020, 09:55 PM
chy_farm

1 Attachment(s)

For an observation and study use, I added several kinds of carrier frequencies from 2kHz to 14.5kHz;
Attachment 36018

Chy
Jul 30, 2020, 10:31 PM
chy_farm

1 Attachment(s)

Quote:

Originally Posted by trigger

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.
Attachment 36019

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
Jul 31, 2020, 12:20 AM
nova_robotics

Quote:

Originally Posted by chy_farm

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.
Jul 31, 2020, 12:39 AM
chy_farm

Quote:

Originally Posted by nova_robotics

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
Jul 31, 2020, 02:27 AM
Carnel

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
Jul 31, 2020, 02:38 AM
chy_farm

Quote:

Originally Posted by Carnel

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
Jul 31, 2020, 02:45 AM
DIYer


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:

<div id="blocks"> <div class="block b1 pngfix"> <div class="bimg"> <div> <a href="https://www.homemadetools.net/homemade-factory-fan-vfd"> <img src="/uploads/234794/homemade-factory-fan-vfd.jpeg"/> </a> </div> </div> <div class="head pngfix"></div> <div class="left pngfix"></div> <div class="right pngfix"></div> <div class="blockover b1 pngfix"> <div class="title"> <a href="https://www.homemadetools.net/homemade-factory-fan-vfd">Factory Fan VFD</a> <span> by <a href="https://www.homemadetools.net/builder/chy_farm">chy_farm</a></span> </div> <div class="tags">tags: <a href='https://www.homemadetools.net/tag/fan'>fan</a>, <a href='https://www.homemadetools.net/tag/controller'>controller</a> </div> </div> </div> </div>

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