From: Paul
Date: Sun, 07 Jan 2001 01:59:11 +0000
Subject: Re: [TSSP] Virtual Secondary Database
Terry,
I couldn't get the error in Lfac estimation much below 1.4%
while fitting a single curve to both toroided and unloaded
coils.
I've split the formulae, to give an RMS error of 1% on
toroided and 0.5% on unloaded,
The curves are:
Unloaded coil
-------------
y = m * x + c
m = 0.30278
c = 0.7044
x = (k1 + g1 * hd) ^ k2 *
(k3 + g2 * b) ^ k4 *
(k7 + g4 * awg) ^ k8 *
(k9 + g5 * h) ^ k10 *
(k11 + g6 * sr) ^ k12
k1 = 2.8958
k2 = -1.3666
k3 = 3.0162
k4 = 0.2817
k7 = 8.5533
k8 = 0.0520
k9 = 0.2088
k10 = 0.0186
k11 = 30748.5575
k12 = -0.0090
g1 = 1.0087
g2 = 1431.0148
g4 = 0.6760
g5 = 0.8779
g6 = 53454.2520
Toroided Coil
-------------
y = m * x + c
m=0.02264
c=0.7058
x = (k1 + g1 * hd) ^ k2 *
(k3 + g2 * b) ^ k4 *
(k5 + g3 * td) ^ k6 *
(k7 + g4 * awg) ^ k8 *
(k9 + g5 * h) ^ k10 *
(k11 + g6 * sr) ^ k12 *
(k13 + g7 * tb) ^ k14
k1 = 1.0868
k2 = -0.7140
k3 = 0.0061
k4 = 0.1906
k5 = 0.0285
k6 = 1.0386
k7 = 44.4533
k8 = 0.7295
k9 = 2.5868
k10 = 0.0061
k11 = 30748.5575
k12 = -0.0250
k13 = 44512.3742
k14 = 0.3807
g1 = 0.8397
g2 = 0.2308
g3 = 0.0254
g4 = -0.0030
g5 = 2.1879
g6 = 53454.252
g7 = 10009.2464
A few extra coefficients this time.
In both cases, y is the estimator for Les/Ldc. I expect the
coefficients will alter when more data comes in. They might also
alter if we restricted to coils with f1 < say 1e6.
Cheers
--
Paul Nicholson,
Manchester, UK.
--
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.