[TriEmbed] laptop fan motor control question

[Scott Hall]

Pete,
For most cooling fans the 3 wires are: red = positive, black = negative, white =
ground.
A fan can create a lot of EMF, and the extra ground is to suppress the noise
reaching the circuit board.

However, on other fans: red = power, black = ground, white = pulse control for
PWM speed control.

Either way, connecting red & black for full power should do the trick unless you
want to wire up a 555 PWM controller with a small pot to control the pulse
width.  (ready-made circuit on Amazon: $7.50,
https://www.amazon.com/gp/product/B00QGMESHM/ref=as_li_ss_tl )

Check out this blog on the subject: "About PC Fans"
https://www.rollitup.org/t/about-pc-fans.385722/

or this one: "How to Create a Three-Speed Fan Control without Spending a Dime"
https://www.hardwaresecrets.com/how-to-create-a-three-speed-fan-control-without-spending-a-dime/

or this video: "How to Power a Computer Fan"
https://www.youtube.com/watch?v=1UgoiEsoMzU

finally this article: "PWM 3-Wires Fan Controller with RPM feedback (Pulse
Stretching Method)"
http://pcbheaven.com/circuitpages/PWM_3_Wires_Fan_Controller_with_RPM_feedback/

- sgh

On 2/2/21 1:15 PM, Pete Soper via TriEmbed wrote:
>
> I pulled a fan/heatpipe assembly out of a laptop to have for future
> experiments and wonder what sort of control I need for it's three wire motor
> connection? Here's the label on the outside. The DC resistance between any two
> pins with any polarity is much higher than I would have expected: thousands of
> ohms.
>
> Thanks,
> Pete
>
>

-- 
Scott G. Hall
Raleigh, NC, USA
ScottGHall1 at GMail.Com

/Although kindness is rarely a job, no matter what you do it's always an option._/

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