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Rodm
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Join Date: Apr 2008
Posts: 3

fan design for speed

04/11/2008 3:34 PM

I am designing a hand held fan system powered by rechargable batteries - Nicad or possibly Lithium. I am looking for any tips regarding design of the shroud or enclosure to help maximize air speed. Also, are axial or 'squire cage' style arangments better for speed and power efficiency? Thanks!
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Sparkstation
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New Zealand - Member - Interested in everything- see my Profile please APIX Pilot Plant Design Project - Member - Member Engineering Fields - Electrical Engineering - Member Engineering Fields - Power Engineering - Member Engineering Fields - Civil Engineering - Member Hobbies - Musician - Autoharp and Harmonica Hobbies - Hunting - Member Hobbies - Fishing - Member

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Location: Christchurch, (The Garden City), South Island, New Zealand
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#1

Re: fan design for speed

04/12/2008 2:09 AM

Hello Rodm

"Squirrel cage" motors run exclusively on AC = Alternating Current, and to supply such a motor from a battery pack will require an Inverter and transformer, all of which will give off further heat.

Are you trying to design something entirely different?

Why I ask, is that most local discount stores sell such a hand-held personal fan for a few $$$.

Kind Regards....

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Rodm
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Posts: 3
#3
In reply to #1

Re: fan design for speed

04/14/2008 9:32 AM

Hello Sparky,

Yes, I am working on a new type of product. I have seen a cordless mattress inflator and leaf blowers using something like a 'squirrel cage' fan, but the blades are short in the axis of the motor and form only a short cylinder, more the proportions of a bottle lid than a tin can.
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Sparkstation
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New Zealand - Member - Interested in everything- see my Profile please APIX Pilot Plant Design Project - Member - Member Engineering Fields - Electrical Engineering - Member Engineering Fields - Power Engineering - Member Engineering Fields - Civil Engineering - Member Hobbies - Musician - Autoharp and Harmonica Hobbies - Hunting - Member Hobbies - Fishing - Member

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#4
In reply to #3

Re: fan design for speed

04/16/2008 7:51 AM

Hello again, Rodm

Sorry I misunderstood your first Post, and presumed you referred to the motor as being a "squirrel Cage" type.

Your fan is a "reel" type, but with a very short axis.

Kind Regards....

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 "The number of inventions increases faster than the need for them at the time" - SparkY
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armchair
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Join Date: Apr 2008
Posts: 2
#2

Re: fan design for speed

04/12/2008 5:10 PM

If your hand held fan is for personal cooling, then an axial fan will work best. Axial fans provide the best airflow when there is no back pressure.
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armchair
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Posts: 2
#5

Re: fan design for speed

04/16/2008 9:17 PM

Futher to your quest for efficiency, in general a DC electric motor will be more efficient than AC, and a brushless DC motor is the most efficient.
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Sparkstation
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New Zealand - Member - Interested in everything- see my Profile please APIX Pilot Plant Design Project - Member - Member Engineering Fields - Electrical Engineering - Member Engineering Fields - Power Engineering - Member Engineering Fields - Civil Engineering - Member Hobbies - Musician - Autoharp and Harmonica Hobbies - Hunting - Member Hobbies - Fishing - Member

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Location: Christchurch, (The Garden City), South Island, New Zealand
Posts: 4395
Good Answers: 230
#6

Re: fan design for speed

04/17/2008 8:03 AM

A further thought, Rodm

You could always try a punkah fan, and obtain a wallah to run it.


Kind Regards....

__________________
 "The number of inventions increases faster than the need for them at the time" - SparkY
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Rodm
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Posts: 3
#7

Re: fan design for speed

04/17/2008 9:38 AM

Thanks for all the comments!
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