mackortoyota
rookie
Reged: Jun 02 2009
Posts: 80
Loc: Ohio
|
|
Earlier today I was testing the failure mode of some spare parts when subjected to multiple 22J 250v blasts, and got nothing particularly interesting. A couple minutes ago I was just running a couple of fans through a bridge, and it catches on fire! It as originally a black disk about the size of a skittle, but flat, and was probably rated for 50v 1a. It was just running at 14v, and .25 amp, but all of the sudden it starts smoking like crazy and catches on fire, desoldered a lead, fusing the other ones together, and burning out a fan. I cut the power to it, and blew out the flame, and it was reduced to a distorted smoking molten blob on my desk. It only had 22awg leads going back to a beefy transformer, so the leads bubbled and smoked along their whole length. What could bring about such a failure with no warning?
--------------------
Xubuntu 9.04 for the win.
|
Dave Johnson
hall-of-fame
Reged: Jun 03 2005
Posts: 2302
Loc: Thornton, CO
|
|
Was this device part of the fan motor assembly? Where these brushless motor type fans? Was there anything left to take a picture of?
--------------------
David Johnson, PE
www.discovercircuits.com
|
mackortoyota
rookie
Reged: Jun 02 2009
Posts: 80
Loc: Ohio
|
|
Just the fan from a pc power suply, the bridge and a 12v transformer with a 52 watt core. I'll try and get a picture of the bridge, and its leads up.
--------------------
Xubuntu 9.04 for the win.
|
mackortoyota
rookie
Reged: Jun 02 2009
Posts: 80
Loc: Ohio
|
|
Okay, here's a link to my flickr page, with the pictures on it. From top to bottom the leads used to be black, yellow, blue, and orange.
--------------------
Xubuntu 9.04 for the win.
|
Dave Johnson
hall-of-fame
Reged: Jun 03 2005
Posts: 2302
Loc: Thornton, CO
|
|
It is hard to be sure, but it might be the brushless motor Hall effect commutator driver IC. There should be about 3 of those in the fan.
--------------------
David Johnson, PE
www.discovercircuits.com
|
Previous
Index
Next
Threaded
Edit
Reply
Quote
