From: Greg Leyh
Date: Tue, 15 Oct 2002 10:46:32 -0700
Subject: Re: [TSSP] F A N T C: - It's NEW! - and needs some TSSP input
At 11:59 PM 10/14/2002, Paul wrote: >Well I hope everyone is busy plugging their coil details >into Fantc to check it out. With 24 members on the list >there should be at least 24 coils to test :) I tried out the stats for the final design set on Electrum. The FANTC program seems to have hit it spot on... certainly well within the error bars of my actual measurements. Here's the actual measurements from the final setup: Lpri = 66.7uH Lsec = 130mH Coupling k = ~0.12 to 0.13 Fo (with sphere) = 37.92kHz Here's the program results. I used a detail level of 3. I'm assuming that both the current and voltage profiles are normalized to a base current of 1A? ------------------------------------------------------- Running F A N T C version x.6 using core functions of G E O T C version: 2.0 Computing ..... please wait Primary Inductance (L1): 65.995 uH Run Complete Time elapsed: 1.8 secs Secondary Inductance (L2): 123.144 mH Run Complete Time elapsed: 2.4 secs Mutual Inductance (L1,L2): 392.31 uH Coupling Coefficient(K): 0.138 Run Complete Time elapsed: 5.8 secs Secondary Resonant Frequency: 38.32 kHz Secondary Voltages and Currents I[0]=1.01 I[1]=1.01 I[2]=1.02 I[3]=1.03 I[4]=1.03 I[5]=1.04 I[6]=1.04 I[7]=1.04 I[8]=1.04 I[9]=1.03 I[10]=1.03 I[11]=1.02 I[12]=1.02 I[13]=1.01 I[14]=1 I[15]=0.99 I[16]=0.98 I[17]=0.97 I[18]=0.96 I[19]=0.94 I[20]=0.93 I[21]=0.91 I[22]=0.89 I[23]=0.88 I[24]=0.86 I[25]=0.84 I[26]=0.81 I[27]=0.79 I[28]=0.77 I[29]=0.75 V[0]=145.07 V[1]=498.03 V[2]=1382.33 V[3]=2374.08 V[4]=3430.69 V[5]=4528.87 V[6]=5654.33 V[7]=6797.6 V[8]=7952.09 V[9]=9112.88 V[10]=10276.16 V[11]=11438.8 V[12]=12598.14 V[13]=13751.82 V[14]=14897.68 V[15]=16033.67 V[16]=17157.83 V[17]=18268.16 V[18]=19362.6 V[19]=20438.93 V[20]=21494.67 V[21]=22526.87 V[22]=23531.84 V[23]=24504.67 V[24]=25438.39 V[25]=26322.44 V[26]=27139.57 V[27]=27858.14 V[28]=28142.63 V[29]=28259.35 Energy Storage Inductance (Lee): 114.3 mH Effective Series Inductance (Les): 117.38 mH Low Frequency Inductance (Ldc): 123.14 mH Energy Storage Capacitance (Cee): 141.21 pF Effective Shunt Capacitance (Ces): 147.44 pF Low Frequency Capacitance (Cdc): 272.11 pF Total Topload Capacitance (Ctop): 102.25 pF Run Complete Time elapsed: 86.3 secs --------------------------------------------- The discrepancy of about 0.01 in the coupling is well within the noise... I remember that the coupling was *incredibly* sensitive to primary altitude. A shift in altitude of one inch yielded a coupling shift of about 0.01. FANTC appears to be an excellent program. The data entry portion is clean and relatively straightforward, and the results are amazingly accurate. Given the complexity of the system being modeled, I'm actually downright astounded that a modeling program could get that close... I rarely if ever have that kind of luck with EM modeling software on the first try.
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.