[Boatanchors] Need magnetic shield for shaded pole motor

[J. Forster]

That should be fine.

-John

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


>  Thought I used to see soft iron recommended for magnetic shielding. Was
> that obsolete thinking or just a bad memory at work?
>
>
>
> Wayne
> WB4OGM
>
>
> -----Original Message-----
> From: Brian Clarke <brianclarke01 at optusnet.com.au>
> To: rbethman <rbethman at comcast.net>; Boatanchors @ Mailman
> <Boatanchors at mailman.qth.net>
> Cc: james.liles <james.liles at comcast.net>
> Sent: Fri, Jan 3, 2014 3:43 pm
> Subject: Re: [Boatanchors] Need magnetic shield for shaded pole motor
>
>
>
>
> Silver-plated copper is good for E-field attenuation, but
> approximately useless for H-field attenuation. For H-field
> attenuation, you need high permeability steel of a thickness dependent
> on the frequency and the amount of attenuation desired. See any
> standard text on EM shielding, eg Ott.73 de Brian, VK2GCE.?
> Brian Clarke
> BE, MBA, PhD, CPEng, FIEAust
> MD, Clarke & Associates P/L
>
> ----- Original Message -----
> From: "rbethman"
> To:"Boatanchors @ Mailman"
> Cc:
> Sent:Fri, 03 Jan 2014 15:26:20 -0500
> Subject:Re: [Boatanchors] Need magnetic shield for shaded pole motor
>
>  On 1/2/2014 9:23 AM, james.liles at comcast.net wrote:
>  > Any ideas for an effective Gaussian shield for an open frame shaded
>
>  > pole motor or a source for very high permeability transformer core
>  > uncut sheets.
>  >
>  > Thanks for any ideas--- Kindest regards Jim K9AXN
>  Jim,
>
>  I see your address in QRZ. I have what may be precisely what you
> need.
>
>  Would two sheets of silver plated copper expanded mesh, 13" x 13 " x
>  0.009" do the encapsulation of this shaded pole motor?
>
>  Bob - N0DGN
>
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