Electrical Conductibility of varnish
Electrical Conductibility of varnish
(OP)
Hi guys,
I was wondering how to measure the electrical conductibility of a varnish? My problem is that we would like to estimate is the conductibility of a varnish we would like to use in a magnetic application.
Can anyone give me a link to references / norms or something else?
Thank you for your help!
I was wondering how to measure the electrical conductibility of a varnish? My problem is that we would like to estimate is the conductibility of a varnish we would like to use in a magnetic application.
Can anyone give me a link to references / norms or something else?
Thank you for your help!





RE: Electrical Conductibility of varnish
A modern equivalent material used on wire is "formvar".
Is it really the dielectric constant or breakdown that are more important?
RE: Electrical Conductibility of varnish
In fact we said "it's conductive", but we would like to quantify for the internal report, in a correct way.
it is really important for our application that no conductive material is used (because of high magnetic fields)...
RE: Electrical Conductibility of varnish
Thomas J. Walz
Carbide Processors, Inc.
www.carbideprocessors.com
Good engineering starts with a Grainger Catalog.
RE: Electrical Conductibility of varnish
What do you mean by "correct way?" One method is to use a Vander Pauw test pattern.
TTFN
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RE: Electrical Conductibility of varnish
RE: Electrical Conductibility of varnish
What exactly is the concern about conductivity, given that you're painting a conductive rotor?
For sheet resistivity see: http://en.wikipedia.org/wiki/Van_der_Pauw_method.
I would start with a high-end PC board with 4 symmetrically placed electrodes, mask off the center and the external contacts, and coat and cure per your procedure. Get a high end, Kelvin-connected resistance meter and have at it.
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: Electrical Conductibility of varnish