[Boatanchors] Need magnetic shield for shaded pole motor

[james.liles at comcast.net]

Good afternoon John,

The original blower is capable of 65cuft/min without restrictions.  When 
blowing through a pair of 8122's the pressure is much higher; the volume is 
reduced to 22 ft/min.  The squirrel cage fan is much more efficient and 
quieter than a bladed fan for large air volume in the presence of back 
pressure.  The seller says the fan is very quiet at 5 volts but says nothing 
about 24 volts.  I sent a question requesting the HP delivered to the blade. 
The electrical HP is approximately 1/128th HP but what is delivered to the 
blade?  If it's 1/150th or better I'll try it and thanks for the response 
John.

I would be very interested in a DC motor with a shaft that I could use to 
drive the blower wheel having the same dimensions as the ebay item.

-----Original Message----- 
From: J. Forster
Sent: Thursday, January 02, 2014 3:17 PM
To: james.liles at comcast.net
Cc: boatanchors at mailman.qth.net
Subject: Re: [Boatanchors] Need magnetic shield for shaded pole motor

The air capacity is easy:  eBay  310310219077, for example.

-John

============


> Hi John,
>
> Both good suggestions but need 25 cuft/minute to cool a pair of 8122's.
> Probably over kill but the 8122's need 6 cuft/min each.  Hard to get a
> muffin fan with that volume that is quiet.  The DC motor is a good
> suggestion but can't exceed a body depth without shaft of 2 inches and
> will
> have to produce 1/150Hp to 1/100Hp at 3000rpm to drive the wheel in transmit
> mode.
>
> I suppose an alternative would be to mount the blower outside the radio
> and
> connect with a hose but would truly like to retain the blower location
> only
> because I'm fussy about these glow in the dark historical place holders.
>
> Thanks again for the suggestions.
>
> Kindest regards Jim K9AXN
>
>
>
> -----Original Message-----
> From: J. Forster
> Sent: Thursday, January 02, 2014 2:44 PM
> To: james.liles at comcast.net
> Cc: boatanchors at mailman.qth.net
> Subject: Re: [Boatanchors] Need magnetic shield for shaded pole motor
>
> Can you replace the fan with a muffin style unit, possibly a brushless DC
> version?
>
> -John