[TriEmbed] laptop fan motor control question

[John Vaughters]

Right Shane, actually I think it you boil all the comments down, we are close. Brushless is not straight forward controls at all and there are methods and schemes to follow. Seems to me if you resonate with the motor switching electronics the motor will just wiggle back and forth. Having said that, once you get the motor running, you may be able use the pwm, but watch out for modal ressonate frequency to the switching scheme, of which I do not have the understanding to determine without the knowledge of the motor design itself.
John Vaughters

Sent from Yahoo Mail on Android 
 
  On Tue, Feb 2, 2021 at 2:34 PM, Brian via TriEmbed<triembed at triembed.org> 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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