Detectig fan failure - modes of failude

From: SioL (Sio_spam_L_at_same.net)
Date: 09/15/04 

Date: Wed, 15 Sep 2004 15:00:02 +0200

I'm designing a device with two convenient solder pads on the PCB
providing LC filtered power to the fan to. This will be a smallish 1W
12V fan, with only two connections (those are cheaper and I can't get
the 3-pin version of 40x40x20 easily).

It occurred to me that it might be great to have failure detection. Now
it'd be easy if these were the 3-pin fans, but they're not. I wonder whether
someone has some experience on modes of failure. Does it consistently
draw more current, no current or should I watch for some AC ripple on
supply line during normal operation, I'd expect there would be some and
it'd stop if the fan stopped rotating.

I'll possibly settle for a NTC if everything else fails, but I have some
PCB real-estate left for other solutions.

SioL

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