higher pitch, probably smaller motors

[n0oxy]

another nice sounding motor

Here is a video of the Electrolux 2100.

I'm not sure if this was a one or two stage motor, but it actually sounds a bit better than the current Aerus classic model, I'll include a video of that for comparison.

The newer aerus classic actually has a higher pitch, not as bad as some of the other screamers, but I think the motors in the older models actually sound better.

 

[blknblu]

The motor in the Electrolux 2100 is a 2 stage thru-flow (flow thru)  motor.


I have a bare one sitting on the bench hooked up. (I should do a video)


This diagram from from Ametek shows how it works.


 


There is a good writeup on how the vacuum motors work here:


http://www.lindsaymfg.com/central_vacuum_motors.htm

 


 


 


 

 

[n0oxy]

motors

That article from the Lindsay Manufacturing site was interesting. Most canister vacuums use the flow through motors, and even some central vacuums do now as well. One of my central vacuum units, the vacumaid garage vac pro uses a two stage flow through motor, it's higher pitched, but it is quite powerful. I'm pretty sure the motor in the current Aerus classic model is only one stage, and you can tell that it spins faster. A lot of the electrolux models, such as the marquis, diplomat, ambassador, and 2100 sound very similar, I'm wondering if all of these models actually use the same motor.

 

[n0oxy]

another good sounding vacuum

I'm not sure when these were out, but the motor sounds good with these, not that annoying high pitch scream, it's a canister called the hoover celebrity.

 

[vacerator]

N0oxy,

yep, that Hoover QS 2 speed sure is nice. I like the 2 speed power nozzle as well. No one else offered that to my knowledge.

 

[n0oxy]

interesting article about vacuum motors

This article talks about good vacuum design in general, but it mentions the trend of moving to one stage motors that spin much faster and thus will where out quicker.

http://www.ristenbatt.com/xcart/Identifying-Durable-Designs-and-Construction.html

 

[rolls_rapide]

Dyson DC07

The Dyson DC07 might have had two different types of motors; it certainly had modified fine-particle cyclones.

The first generation of DC07 had vortex finders on the small cyclones, which had aerofoils similar in design to aircraft propellers. These machines had that ear-splitting whistle.

The later versions had a simpler vortex finder more like the DC14 & DC15. The noise was more of a dull roar. The length and/or diameter of the cyclones might have been altered too.