PTS Flowbench Forum

Hello all,
I'm from the Netherlands and i'm building a PTS flowbech.
The woodwork is nearly finished and now i need motors and electronics.
I've searched the forum for information about vacuum motors. There is a lot of good info about motor output and Amp/CFM relation etc. but the most motors are 110v. In most of Europe we use 240v so i need 240v motors.
I've red the topic "Vacuum Motor shop Ametek for European People"
http://www.flowbenchtech.com/forum/view ... ors+europe

Here 998rider refers to this company http://reinigungs-hygienetechnik.de/ were he ordered his Ametec motors for a decent price but i've emailed them and they don't sell these motors anymore.
They have a lot of motors but no datasheets so it's impossible to compare them.
I also found the Domel (Slovenia) website http://www.domel.com/
They have 240v motors and datasheets.
Like this one: Domel 467.3.234
This one seems to have similar spec as LH9563-00
Is this correct?


Can anyone tell me another good 240v motor that can be bought in europe?

Here are a couple of motors I know another forum member is looking at:

http://reinigungs-hygienetechnik.de/de/ ... W-578.html

http://reinigungs-hygienetechnik.de/de/ ... -W-36.html

Without the flowsheet it's pretty hard to get a good idea of what they will flow in a flowbench application. Tony is the resident motor guy see if he weighs in on this with his thoughts.

Psst, that other member is me Bruce.

I am located in Australia, so have absolutely no idea what might be available in northern Europe.

As Bruce has pointed out, without some flow curves its not really possible to know how either motor will perform with 44 inches of back pressure.

Hello Tony,
What do you think about the Domel 467.3.234 specifications?

vuurmuur wrote:Hello Tony,
What do you think about the Domel 467.3.234 specifications?

It is an excellent motor.
At 41 inches quoted as 103 CFM and 5.53 amps.

That works out to 18.6 CFM per amp which is right up with the very best.
Cost and availability in your part of the world is something to look into...

That's what I thought already.
So to be clear:
If you want to select a motor that is efficient in a flowbench, then look at the flow and efficiency of the motor at your desired test pressure. In our case 44" h2o (28" test pressure + 16" pressure difference over the orifice plate.
This way you make sure that the input power is turned into maximum flow.

I also noticed that this Domel motor has side scoops, are they used for a wet and dry motor? Do they have side effects?

vuurmuur wrote: If you want to select a motor that is efficient in a flowbench, then look at the flow and efficiency of the motor at your desired test pressure. In our case 44" h2o (28" test pressure + 16" pressure difference over the orifice plate.
This way you make sure that the input power is turned into maximum flow.

That is it exactly.

We are trying to turn amps into airflow, and most of us have a definite upper limit on the available mains power.
So the starting point is to select the most efficient motors to get the highest airflow for the power available.
Size is relatively unimportant, its efficiency that matters.

Its also a good idea to add an extra motor or two so that you will always be able to run right up to the limit, and still have a bit of adjustment in reserve.

Ok thanks for clearing it up.
So how about the side scoops on the turbine housing?
Do they have negative effects if the motors are placed close together like in a flowbench?

The side scoops are on the discharge side, and there is going to be a lot of turbulence there anyway, so I cannot see that the particular style of housing being any better or worse than another type.

The final CFM/amp efficiency figure is really the best guideline, and those motors come out pretty well.

When that motor is enclosed in a vacuum cleaner, its pretty tight in there, probably a lot tighter than in your motor box.
So I would not worry about it.