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4hv.org :: Forums :: Tesla Coils
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Why are primaries wound flat?

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speakerguy79
Thu May 01 2008, 03:27AM Print
speakerguy79 Registered Member #1460 Joined: Thu May 01 2008, 12:45AM
Location:
Posts: 19
On all the big tesla coils I see, the primaries are wound flat instead of cylindrically around the secondary. I would think the latter would give better coupling. So why the flat primaries and tall secondaries? Thanks!
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Myke
Thu May 01 2008, 03:37AM
Myke Registered Member #540 Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
If they were wound in a helix then there might be too much coupling causing turn to turn arcing.
There are conical primaries though.
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J. Aaron Holmes
Thu May 01 2008, 04:54AM
J. Aaron Holmes Registered Member #477 Joined: Tue Jun 20 2006, 11:51PM
Location: Seattle, WA
Posts: 546
Plus, a cylindrical primary is basically an autotransformer; the unconnected end can reach voltages far exceeding the primary tank voltage, which can entice flashovers and other badness.

Cheers,
Aaron, N7OE
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