Variable Frequency Drive for a larger factory fan

[chy_farm]

Thanks trigger, will keep your words in mind.

Chy

[chy_farm]

Schematic after the power unit is as follows;

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;




Chy

[chy_farm]

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




Chy

[chy_farm]

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


Chy

[chy_farm]

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.


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

[nova_robotics]

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.

[chy_farm]

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

[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

[chy_farm]

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

[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:

Factory Fan VFD by chy_farm

tags: fan, controller