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Building Transformer & flux density
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From: ESchulz531-at-aol-dot-com [SMTP:ESchulz531-at-aol-dot-com]
Sent: Friday, June 12, 1998 12:36 PM
To: tesla-at-pupman-dot-com
Subject: Building Transformer & flux density
Hi,
I am building a transformer for my tesla coil.
I need to figure out the cross sectional area of the iron core.
This would be related to max flux density in iron.
F stands for flux, A is area,
f is frequency, N number of turns,
B is magnetic field, V is voltage
F = B * A
now for a close packed coil using faradays law
Emf = -d/dt * N * F
so if we substitute in for the flux F
Emf = -d/dt * N * B * A
Which can be rewritten as
V = f * N * B * A
Which can be rewritten as
B = V / (f * N * A)
ok I measured a NST and a H&R transformer and found
for NST B = 7.34 Tesla
for H&R B = 5.86 Tesla
5.86 and 7.34 Tesla seem kind of high to me. Am I missing
a factor or two? Does this sound right? Is all the physics good?
Thanks
Erik
p.s. I actually remember some physics. ¦¬)