Electronics > Projects, Designs, and Technical Stuff
Make an inductance coil
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quentief:
Do you know a relation between the magnetic flux, the reluctance of the magnetic circuit and the maximum current that a iron core coil can tolerate ?
jonpaul:
Bonjour encore Monsieur

SVP Comment vous appelez-vous?

1/ Now we understand better. Try other metals besides iron nails, eg copper, tungsten, zinc, etc. all will give different colors and effects. A welding supply store will have professional welders electrodes designed for drawing arcs. These have easier starting with low work function coatings. Still the carbon are the best in general. Much of the work on arcs in air is classic and books back to 1880s...1920s discuss starting, work functions of metals, etc.

2/ Starting kick is from the inductive energy stored that is released as a high voltage when a circuit is interrupted. Most carbon arcs can be mechanically started, and perhaps some type of electrodes.

3/ The airgap design to avoid saturation is covered in most magnetics courses on graduate level. Bravo to explore this interesitng subject!

The formulas and practical design info is easy to find in old engineering textbooks, but perhaps not so easy online. I am sure most are in English and not French!

If you PM me I make a list of recommended books.

4/ Finally the old steel lamination suppliers had tables and chars for design of mains transformers and inductors, but most of those firms have offshored to cChina and have no good applications. Only old ones exist as printed.

5/ Easy solution: Take the MOT or other transformer, remove any varnish and disassemble.

Place a plastic or paper spaces as a gap between E and I laminations, perhaps 1 mm thick.

Reassemble and clamp together.

Test for saturation and repeat if gap is too big (low inductance) or too small (saturates)

Bon chance!

Jon

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