kaktus' guide - fans part 2 - improvement of extruder fan working

Moderator: _kaktus_

Post Reply
User avatar
_kaktus_
Site Admin
Posts: 1258
Joined: Fri Dec 15, 2017 10:06 pm
Location: PL
Contact:

kaktus' guide - fans part 2 - improvement of extruder fan working

Post by _kaktus_ » Thu Mar 01, 2018 2:34 am

Hello Ladies and Gentlemen.

I have a proposition to make quieter extruder fans work.
When I started controlling the fans, their squealing began to irritate me.
https://www.geeetech.com/forum/viewtopi ... 77&t=60938
https://www.geeetech.com/forum/viewtopi ... 66&t=60821
This is because the rotation speed is controlled by a PWM signal, about audible frequencies.

Just add a suitable capacitor to make the fan operation quieter.
And now I will tell you what to do and how to do it.

The fans supply is 12V DC. Therefore, the operating voltage of the capacitor can not be lower. We need electrolytic capacitors for 16V, or more.

For a fan operation, the capacitor should have a higher capacity, e.g. around 470μF.

But ...

When choosing such a capacitor, we obtain a small range of speed control. This is due to the specific nature of the circuit built. (frequency, voltage, etc.)

Because

The capacitor with lower capacity should be selected experimentally, as desired.
I did tests with capacities from 22μF.

Warning:
<i>Choosing too small capacitance may cause the capacitor to heat up and destroy it, which can be dangerous (the capacitor may in extreme cases be torn apart - explode). </i>

For this reason, I increased the capacity of used capacitors to 33μF.
movie with presentation https://www.youtube.com/embed/vFn20SeqtMA
I am asking for your understanding because I am not a professional creator in this area. While watching, it's worth to turn up the volume.

The capacitor must be soldered to the red and black wires of the fan, <b>keeping special attention to maintaining the correct polarity.</b> The black cable to the negative terminal of the capacitor, the red wire to the positive terminal capacitor.

[attachment=2]dodatkowy_kondensator.jpg[/attachment]
[attachment=3]dodatkowy_kondensator_.jpg[/attachment]
[attachment=1]przygotowane_PCB.jpg[/attachment]
[attachment=0]zamontowena_PCB_Extruder-CON.jpg[/attachment]

I wish you all the more quiet and peaceful evenings, with only successful prints.

kaktus ;-D
Attachments
zamontowena_PCB_Extruder-CON.jpg
zamontowena_PCB_Extruder-CON.jpg (247.72 KiB) Viewed 7556 times
przygotowane_PCB.jpg
przygotowane_PCB.jpg (409.37 KiB) Viewed 7556 times
dodatkowy_kondensator.jpg
dodatkowy_kondensator.jpg (253.67 KiB) Viewed 7584 times
dodatkowy_kondensator_.jpg
Haaa - Just on the PCB there is room for two capacitors
dodatkowy_kondensator_.jpg (300.72 KiB) Viewed 7584 times
Last edited by _kaktus_ on Tue Apr 17, 2018 12:29 am, edited 1 time in total.

User avatar
_kaktus_
Site Admin
Posts: 1258
Joined: Fri Dec 15, 2017 10:06 pm
Location: PL
Contact:

Re: kaktus' guide - fans part 2 - improvement of extruder fan working

Post by _kaktus_ » Tue Mar 06, 2018 3:16 am

Hello
:mrgreen:

We have another part:
kaktus' guide - fans part 3 - summary

Were the guides useful :?:

kaktus

Post Reply

Who is online

Users browsing this forum: No registered users and 19 guests