woodPixel
10th January 2017, 09:30 PM
Just a quick question.
Is a 400mm impeller on a 530mm housing with a 2HP motor OK?
It has a 150mm inlet.
Lappa
10th January 2017, 09:48 PM
Interesting question. I can fit a bigger impeller in my housing. This thread mentions this combo
http://www.woodworkforums.com/f200/building-dust-extractor-system-191635/2
BobL
10th January 2017, 10:10 PM
If it is an efficiently designed impeller you'll overload and burn out the motor.
If it is an inefficient impeller the fan curve will be $hyte.
4HP or 5HP is usually needed for this size impeller.
MandJ
11th January 2017, 01:24 PM
What BobL said, that's a real quick way to burn a motor out- hope it's mounted outside :D
woodPixel
11th January 2017, 01:46 PM
Its on this commercial model: https://www.timbecon.com.au/extraction-safety/dust-extractors-filters/2hp-industrial-dust-extractor
BobL
11th January 2017, 02:43 PM
Its on this commercial model: https://www.timbecon.com.au/extraction-safety/dust-extractors-filters/2hp-industrial-dust-extractor
It will probably have a derated impeller (reduce fin size) meaning it won't have a very good fan curve.
Just like a squirrel cage fan it will move lots of air but as soon as any restriction is put on it, the fan will cavitate.
If anyone in Perth has one I will be happy to measure its real performance specs.
Got any good photos of the impeller and the inside of the impeller housing?
Bohdan
11th January 2017, 02:46 PM
If it is an efficiently designed impeller you'll overload and burn out the motor.
If it is an inefficient impeller the fan curve will be $hyte.
4HP or 5HP is usually needed for this size impeller.
They claim an efficiently designed impeller but what they are probably relying on is that it will be connected to a 4" outlet on a machine via a 4" hose, and because of the restricted airflow draw nowhere near 2 HP.
I really would like to see a figure for current draw in actual use before I would call it a 2HP unit.