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RE: through bolts

72.253.179.5

In Reply to: RE: replacing stamped transformer bells with solid aluminum posted by Triode_Kingdom on April 29, 2012 at 20:14:50

should be insulated if ferrous as they will short the magnetic pathway. Non magnetic bolts and studs do not need this.

Stu

Follow Ups:

RE: through bolts - Tom Bavis 06:03:15 05/01/12 (2)
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.
- RE: through bolts - Swanson 09:51:43 05/01/12 (1)
  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
  - RE: through bolts - berndt 10:52:22 05/01/12 (0)
    Thanks for the explanation. I believe I follow you.

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