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Brushless Motors Answered

I have a few fans around from computers. Seems that 3 wires is pretty common for these. I wasn't sure which was what, so, I figured "nothin to lose" and hooked up the right voltage across 2 wires. My guess was right. It ran. But, having 1 out of 9 fanblades busted off, it shook a bit. So, I busted off 2 more blades to balance it. But now, even connecting it the same way, it doesn't run.

So, how should a 3 wire brushless motor fan be wired?

Discussions

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Toga_Dan

5 years ago

Sounds like maybe I overrevved it and burned somethin up.

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Downunder35m

5 years ago

Red positive, black negative, yellow for the sense.

You might have damaged the electronics and without them it won't spin at all.

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mpilchfamily

5 years ago

The 3rd wire (typically yellow) on PC fans reports RPMs back to the motherboard.