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Old May 22, 2006, 10:38 AM
RIP Ric
Andy W's Avatar
Marietta, GA
Joined Jun 1999
43,312 Posts
Question
PC cooling fan - 3 wire?

.. picked up a 120mm cooling fan for a PC, to use in a new battery tube I'm building. This one comes with three wires - the usual red and black, plus a yellow. It also came with a smaller connector than the usual hard drive/CD Rom hookup connector, so I assume this connected directly to the motherboard, and the third wire is used to control fan speed?

Anyone know how it should be wired?
Thx!
..a
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Old May 22, 2006, 10:44 AM
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The Other Dave's Avatar
Colorado Front Range, USA, EARTH, Sol system, Milkyway Galaxy
Joined Nov 2001
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Quote:
Originally Posted by Andy W
.. picked up a 120mm cooling fan for a PC, to use in a new battery tube I'm building. This one comes with three wires - the usual red and black, plus a yellow. It also came with a smaller connector than the usual hard drive/CD Rom hookup connector, so I assume this connected directly to the motherboard, and the third wire is used to control fan speed?

Anyone know how it should be wired?
Thx!
..a
Andy,

The third wire is used to sense rpm not control it.

Dave
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Old May 22, 2006, 10:46 AM
RIP Ric
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Marietta, GA
Joined Jun 1999
43,312 Posts
Aha! So just hook up 12V and be done with it.
Thx! (that was quick!)
..a
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Old Jun 02, 2006, 11:36 AM
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The Northeast Kingdom, Vermont
Joined Jun 2004
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Hi Dave,
Kind of a dumb question here regarding the 12v dc case fans.
Are they brushless? And if so, how do they work?
Just curious, I don't have a worn out one on hand to dissect.
Regards,
Pete
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Old Jun 02, 2006, 12:15 PM
RIP Ric
Andy W's Avatar
Marietta, GA
Joined Jun 1999
43,312 Posts
Yes, they are brushless. They have a controller built right onto the board, along with the stator..
..a
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Old Jun 02, 2006, 06:55 PM
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They are indeed brushless, but only have 4 stators and 8 poles, I think...
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Old Jun 03, 2006, 01:17 AM
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Joined Nov 2004
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Surplussed cooling fans from electronics can be a source of small bearings.
I've seen brand new fans sell for less than the pair of bearings they contain
from some RC dealers. (of course, it might be ... entertaining and expensive
matching fan size to bearing size by trial and error...)
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Old Sep 19, 2008, 01:37 AM
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HI. my cd-rom have 4 wire ? can you help me get it going. and i have a 6 amp esc
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