Power consumption of axial fan over voltage range?

[Flyback]

Hi,
Do you know what the power consumption of the 624HH Papst fan is at voltages from 18-30V?

624HH fan

https://img.ebmpapst.com/products/datasheets/DC-axial-fan-624HH-ENU.pdf?_ga=2.173156963.1761286910.1643461652-146278518.1643461652

Its rated 18-28V, but we intend to run it mainly at 30V. The boss says so.
(we only know it draws 3.6W at 24v input)

 

[Pommie]

Hmmm, max voltage 28V boss says run at 30V. Guess your boss wants a high failure rate.

Mike.

 

[Flyback]

Thanks, what would power consumption of the fan be at 28V input?....same as with 24v input?

I appreciate that few will answer for 30v, as its out of "range".

 

[Pommie]

No way to know. The power may stay constant over it's voltage range or it may not!

Mike.

 

[rjenkinsgb]

If the motor speed tracks the supply voltage, the power consumption would change with the cube of the speed change ratio.

However, the datasheet gives a fixed 3.6W power consumption so the motor may be regulated to a fairly constant speed.
In that case, current could decrease as voltage increased, to maintain the same power.

Or it could be somewhere inbetween those extremes...

 

[ChrisP58]

Why don't you just test one? As you're planning to operate it beyond it's specified limits, that's probably the only way to know for sure.

Also, be sure to test it under whatever transient conditions that your 30 Volts may feed it. While I would expect the fan's absolute max ratings (which the datasheet doesn't give) to be at least a couple of volts above its sec'd nominal, you're using up a fair percentage of whatever safety margin that might have been.