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In Reply to: RE: through bolts posted by unclestu on April 30, 2012 at 12:21:52
Mounting bolts can form a shorted turn that intercepts part of the magnetic flux, wasting power as heat in a power transformer, reducing inductance (and low-end response) in an output transformer. The major loop is chassis to bolt to top end bell to bolt to chassis. If bolts are insulated at one end, it breaks this loop. Smaller loops can be created if bolt threads contact laminations, so sleeve them too. Brass bolts or steel will have the same problem - brass would be worse as it's more conductive.
Follow Ups:
I have done the bolt insulation experiment on
various power transformers that did not have
insulated bolts and was able to shave off
several milliamps of primary excitation current
with the bolts fully insulated.I think it's
a good idea to insulate those bolts for the lowest losses.
Regards,
Swanson
Thanks for the explanation. I believe I follow you.
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