Thanks, guys. The connections were red for positive, blue for ground and
brown for what I assume is the PWM input. It spins up with 5V just fine
and I feel silly about the high resistance measurement. The fan cools a
pair of heat pipes from two IC sites side by side and the whole thing is
copper. The IC sites have faint markings but I can just make out "attach
Peltier devices here". After only eight years I may be able to store my
solder paste in something smaller than a dorm fridge. :-)
-Pete
On 2/2/21 2:34 PM, Brian via TriEmbed wrote:
On 2/2/21 1:15 PM, Pete Soper via TriEmbed wrote:
The DC resistance between any two pins with any polarity is much
higher than I would have expected: thousands of ohms.
Others have already mentioned:
- It's probably a brushless motor
- Three wires are probably power, ground, and tachometer
The reason you see an unexpectedly high resistance across the power
leads is because there are active electronics inside the thing to
commutate the brushless motor. You're not measuring a motor winding.
I say if you have a red and black wire, hook that up to +5 VDC and see
if she spins.
-B
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