Re: Potato Chips (fwd)

---------- Forwarded message ----------
Date: Mon, 27 Apr 1998 15:59:20 GMT
From: Jim Fosse <jim.fosse-at-bjt-dot-net>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: Potato Chips (fwd)

>From:  Bert Pool [SMTP:bertpool-at-ticnet-dot-com]
>Sent:  Monday, April 27, 1998 6:28 AM
>To:  Tesla List
>Subject:  Re: Potato Chips (fwd)
>> The laminations on one of my unpotted neons is out of square.  The thing
>> is twisted looking and I don't like the way it looks so I took it all
>> apart. The laminations were stuck together with something like varnish or
>> polyurethane.  I decided to sand blast the laminations to remove the
>> varnish. 

>Gary - do *not* remove the varnish off the laminations!  The varnish is there to 
>electrically isolate each metal plate from the next.  As I recall, the insulation 
>reduces either hysteresis losses or eddy current losses in the transformer.

	I used to think that also but, I've 2 1kW arc lamp ballasts
that are shunt regulated auto transformers that have the laminations
arc welded together. Several of my microwave transformers are also arc
welded together. I now think that the varnish, besides insulating the
windings and holding them together, keeps the laminations from
vibrating and generating acoustic noise.