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 Post subject: Panaflo 92mm RPM at 5V?Posted: Sat Nov 16, 2002 3:08 pm

Joined: Sun Oct 06, 2002 1:20 pm
Posts: 341
Location: Vancouver
Does anyone know the fan speed of a Panaflo 92mm (Low) at 5V?

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 Post subject: Posted: Sat Nov 16, 2002 5:48 pm

Joined: Fri Nov 01, 2002 11:31 am
Posts: 20
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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 Post subject: Posted: Sun Nov 17, 2002 5:57 am

Joined: Sun Oct 06, 2002 1:20 pm
Posts: 341
Location: Vancouver
oops forgot they were proportional... thanks

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 Post subject: Posted: Sun Nov 17, 2002 10:58 am

Joined: Sun Aug 11, 2002 3:26 pm
Posts: 262
Location: Worcester, UK
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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 Post subject: Posted: Mon Nov 18, 2002 1:46 am

Joined: Sun Oct 06, 2002 1:20 pm
Posts: 341
Location: Vancouver
maybe c could be negative if the fan stops before hitting 0v?

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 Post subject: Posted: Mon Nov 18, 2002 3:18 am

Joined: Sun Aug 11, 2002 3:26 pm
Posts: 262
Location: Worcester, UK
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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Computers should be seen and not heard...

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 Post subject: Posted: Mon Nov 18, 2002 3:58 pm

Joined: Sun Oct 06, 2002 1:20 pm
Posts: 341
Location: Vancouver
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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