[TriEmbed] laptop fan motor control question

[Pete Soper]

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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