Need help with making a brushless fan into a camping fan.

[Unclejonny]

Been doing some internet searching and I can't find a way to manually control the speed with a brushless radiator fan 3 or 4 wire. I think they have a built in esc. The BMW brushless fans have 2 big wires and 1 little wire going to the fan. Mercedes and others have 2 big wires and 2 little wires. My plan is to make a frame to hold the fan (kind of like a box fan) and have the fully adjustable speed control on top. But I don't know what all I need to control the speed. I have a 12v lithium battery to power it. Any suggestions? I want to do this for the efficiency of the brushless fan and it would push more air too. From what I gathered I think all I need is a low input signal pwm but not sure. And also I wouldn't know how to wire. Any good input would be highly appreciated.
Thanks!!

[Unclejonny]

Nobody?

[camcojb]

They make DC controllers for brushless fans with multiple amp and watt outputs. Not sure what your budget is

https://www.anaheimautomation.com/marketing/brushless-dc/brushless-dc-controllers.php?gclid=Cj0KCQiAxoiQBhCRARIsAPsvo-zVeutSISNwJHV5TkQtjAGid0F0KnujubwB8HH3IkG6KZCH_cqD lowaAk0kEALw_wcB

https://www.groschopp.com/control/brushless/

[ADY]

I have this fan for camping if that has decent flow and saves you the time building your own:

https://smile.amazon.com/Quick-Products-1229-4038-QP-TE1-0126-Boundless/dp/B06Y196VR8/ref=sr_1_5?crid=26139R9SI332N&keywords=12v+camping+fan&qid=1644450513&sprefix=12v+camping+%2Caps%2C149&sr=8-5

[Unclejonny]

Thank you! I'll call those places today. And thank you for sending me a link to that fan.

[andrewb70]

Been doing some internet searching and I can't find a way to manually control the speed with a brushless radiator fan 3 or 4 wire. I think they have a built in esc. The BMW brushless fans have 2 big wires and 1 little wire going to the fan. Mercedes and others have 2 big wires and 2 little wires. My plan is to make a frame to hold the fan (kind of like a box fan) and have the fully adjustable speed control on top. But I don't know what all I need to control the speed. I have a 12v lithium battery to power it. Any suggestions? I want to do this for the efficiency of the brushless fan and it would push more air too. From what I gathered I think all I need is a low input signal pwm but not sure. And also I wouldn't know how to wire. Any good input would be highly appreciated.
Thanks!!

This should do the trick:

https://www.amazon.com/gp/product/B07KVYQ78K/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

It doesn't go below 1000Hz but when I did some testing with the Volt fans, it seemed to work just fine:

8EYu5jVBvKA&t=5s

Andrew

[Unclejonny]

That's exactly what I was looking for! Thank you!! I think that controller will be just fine for what I'm doing. I'll get it ordered.