[Boatanchors] Need magnetic shield for shaded pole motor

[J. Forster]

OK.

The closed loop band does not need grounding; the interwinding one does.

-John

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


> John,
>
> I indeed was meaning the outer copper band.  Certainly not the "inner"
> one.
>
> That's the type of construction that I've seen on 75 KVA and up - pole
> mounts or pad mount.
>
> Bob - N0DGN
>
> On 1/2/2014 3:37 PM, J. Forster wrote:
>> 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
>>
>> ==============
>
>