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 Post subject: Panaflo 92mm RPM at 5V?
PostPosted: Sat Nov 16, 2002 3:08 pm 
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Joined: Sun Oct 06, 2002 1:20 pm
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Location: Vancouver
Does anyone know the fan speed of a Panaflo 92mm (Low) at 5V?


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PostPosted: Sat Nov 16, 2002 5:48 pm 
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Location: San Jose, CA USA
Volts_____Fan speed/noise
12__________100%
_7___________58%
_5___________42%

Just take the rated speed and multiply.


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PostPosted: Sun Nov 17, 2002 5:57 am 
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Location: Vancouver
oops forgot they were proportional... thanks


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PostPosted: Sun Nov 17, 2002 10:58 am 
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was wondering about this, and i think that they probably are proportional, but how do you know that the line would (theoretically) pass through 0RPM at 0V?

If its linear then it satisfies y=mx+c, where y=RPM and x=Voltage. How do you know that c=0? jus wondering... :?

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PostPosted: Mon Nov 18, 2002 1:46 am 
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maybe c could be negative if the fan stops before hitting 0v?


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PostPosted: Mon Nov 18, 2002 3:18 am 
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c could be negative, but i dont think that the fact that it stops before 0V would be the reason. y=mx+c is only valid when V is greater than the start up voltage. Below the startup voltage, RPM is clearly 0. Anyone have an RPM sensing fan they can use to find the RPM at 5,7,12V?

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PostPosted: Mon Nov 18, 2002 3:58 pm 
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assuming my rheostat is working in accord with specs, my 92mm fan is running:
2500rpm at 11V (rated max voltage of rheostat; fan is rated at 2800rpm+/-10% at 12V)
1500rpm at 5V

1500rpm/2500rpm = 60%
5V/11V = 45%

That doesn't seem very linear, but if rpms include 10% error then the ratios may be closer.


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