Re: Detectig fan failure - modes of failude

From: Spehro Pefhany (speffSNIP_at_interlogDOTyou.knowwhat)
Date: 09/15/04 

Date: Wed, 15 Sep 2004 13:02:49 GMT

On Wed, 15 Sep 2004 15:00:02 +0200, the renowned "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.

Yes, that will work. It might be patented however.

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

Best regards,
Spehro Pefhany 

-- 
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