Panaflo 92mm RPM at 5V?

Control: management of fans, temp/rpm monitoring via soft/hardware

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

Panaflo 92mm RPM at 5V?

Post by shunx » Sat Nov 16, 2002 3:08 pm

Does anyone know the fan speed of a Panaflo 92mm (Low) at 5V?

Renod
Posts: 20
Joined: Fri Nov 01, 2002 11:31 am
Location: San Jose, CA USA

Post by Renod » Sat Nov 16, 2002 5:48 pm

Volts_____Fan speed/noise
12__________100%
_7___________58%
_5___________42%

Just take the rated speed and multiply.

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

Post by shunx » Sun Nov 17, 2002 5:57 am

oops forgot they were proportional... thanks

ChiefWeasel
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Location: Worcester, UK

Post by ChiefWeasel » Sun Nov 17, 2002 10:58 am

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... :?

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

Post by shunx » Mon Nov 18, 2002 1:46 am

maybe c could be negative if the fan stops before hitting 0v?

ChiefWeasel
Posts: 262
Joined: Sun Aug 11, 2002 3:26 pm
Location: Worcester, UK

Post by ChiefWeasel » Mon Nov 18, 2002 3:18 am

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?

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

Post by shunx » Mon Nov 18, 2002 3:58 pm

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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