[Boatanchors] Need magnetic shield for shaded pole motor

[hwhall at compuserve.com]

And if I recall right, the copper shield should be electrically insulated from the motor frame where it wraps around it, but will need to have a lead to ground. Is that right? Hope he can give that a try and that it works.
   
 
   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 11:37 am
 Subject: Re: [Boatanchors] Need magnetic shield for shaded pole motor
   
 Certainly worth a try. If ventilation is an issue, copper window screen, 
 soldered alond the whole seam though. 
  
 -John 
  
 ============ 
  
 > Sounds like it would be an easy experiment to wrap some copper sheet 
 > around the motor frame and tack solder the ends. Might do the same mag 
 > field "shorting" that the copper accomplished for those transformers. 
 > 
 > 
 >  Wayne 
 > 
 > 
 > 
 > -----Original Message----- 
 > From: J. Forster <jfor at quikus.com> 
 > To: rbethman <rbethman at comcast.net> 
 > Cc: boatanchors <boatanchors at mailman.qth.net> 
 > Sent: Thu, Jan 2, 2014 12:45 pm 
 > Subject: Re: [Boatanchors] Need magnetic shield for shaded pole motor 
 > 
 > The layers of copper inside transformers are for electrostatic shielding 
 > between windings. Not magnetic. They are never connected from start to 
 > frinish, because that would be a shorted turn. They're entirely 
 > capacitive. 
 > 
 > Some transformers have a copper band wrapped around the outside of the 
 > core, with beginning soldered to the end of the turn. That copper layer is 
 > for mahnetic shielding, due to eddy currents. 
 > 
 > -John 
 >