Re: Detectig fan failure - modes of failude
From: John Fields (jfields_at_austininstruments.com)
Date: 09/15/04
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Date: Wed, 15 Sep 2004 17:59:10 -0500
On Wed, 15 Sep 2004 15:00:02 +0200, "SioL" <Sio_spam_L@same.net>
wrote:
>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.
--- I think a thermistor would be your best bet. Run it in self-heating mode with the airstream flowing across it to cool it. If the fan stops it will heat up, its resistance will decrease, and there ya go! -- John Fields
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