[Boatanchors] Need magnetic shield for shaded pole motor

[hwhall at compuserve.com]

Ah! Hadn't looked at it that way. Good thinking.
 

 Wayne



-----Original Message-----
From: J. Forster <jfor at quikus.com>
To: hwhall <hwhall at compuserve.com>
Cc: boatanchors <boatanchors at mailman.qth.net>
Sent: Fri, Jan 3, 2014 11:05 am
Subject: Re: [Boatanchors] Need magnetic shield for shaded pole motor
 
Both muffin fans and brushless DC muffin fans are an inverted design. The 
rotors are on the outside. This results in much better shielding of the H 
fields. 
 
Hence the suggestion. 
 
-John 
 
================ 
 
 
 
 
> All motors operate via changing magnetic fields, so a DC motor isn't a 
> sure fix, but a different motor might produce a slightly smaller problem. 
> It sounds like the problem is a minor one, so that perhaps only a minor 
> improvement is needed. The sheet steel experiment, like the coffee can 
> metal, seems worth trying to see if it helps to any degree. BTW, is the 
> current motor a brushed motor or an induction motor? 
> 
> Wayne 
> WB4OGM 
> 
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