[BITList] NYTimes.com: Worm Was Perfect forSabotagingCentrifuges

[FS]

Hugh,
The motors are controlled by a frequency controller the frequency of 
which is set by the software in-bedded in the system by introducing a 
worm (a piece of malicious code) into the software the controller can be 
made to do things that the original unadulterated software would not 
have allowed hence the ability to wind the motor frequency up to twice 
to three times its base speed or down to almost zero the other way with 
no loss of torque, much easier than changing belts or gears so if one 
was to assume that the supply frequency is 50Hz and a 2pole motor used, 
the base speed would be 3000rpm x what ever the output ratio is in this 
case probably around 4/1 which the frequency controller would normally 
bring down to around 11500 so if the worm has the controller wind the 
centifuge up to doulble its design speed one gets rather interesting 
results bit like the airbus380 turbine disc disintegrating
frank

On 11/19/2010 10:44 PM, HUGH wrote:
> Aye, but (as I'm told I used say, pestering my elders and betters when 
> yet a child), how could they overspeed?  Are the motor speeds computer 
> controlled?  Why would there be a possible RPM that could wreck the 
> place? Of what use would it be?
> Hugh.
>
>
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