Why Isn't My Coil Simulation Achieving the Expected 8pT Signal in Maxwell?

AI Thread Summary
The user is attempting to simulate a coil in Maxwell to achieve an expected 8pT signal at 50 meters, based on specific coil properties from a referenced paper. Despite using both voltage and external circuit types in the simulation, they are unable to reach the desired signal strength. Concerns are raised about the accuracy of the frequency, suggesting it may be closer to 575kHz rather than 575Hz, as the low reactance at 575Hz seems inconsistent with the coil's specifications. Additionally, the user seeks guidance on selecting the appropriate resistance value for the sinusoidal source, noting its significant impact on the results. The discussion highlights the need for careful verification of parameters to achieve accurate simulation outcomes.
azita3285
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hello every one

i want too simulate a coil with with Maxwell and transient solution type:
this coil is in a paper and i want to simulate it

i attach the coil properties. in this paper the dimension of coil is given such:

diameret:12cm; length=84cm; moment=30a-m^2; construction= 16 turns AWG#12; coil voltage=65Vrms=91Vpeak; frequency=575hz; depth rating=30m
and @ 50 meter from this antenna we have 8pT signal


i calculate the equivalent circuit:
you know the AWG#12 diameter is 2.053mm and has 5.211 mohm/m, and as we say, the coil voltage is 91v, so we have:

Rcoil=30.85mohm; Lcoil=.15mH

i simulate the coil with the thickness of 2.053 which is the same of diameter of wire.
so i simulate it with two type of winding (voltage and external)

1) in voltage type i fill in the blanks such these:
initial current=0 ; resistance=30.85mohm, inductance=.15mH , voltage=91*cos(2*pi*575*time)
i run this but i don't achieve the 8pT signal @ 50 meter from antenna. i attache it by the name of coil with voltage

2) external: in this type i create an external circuit with maxwel circuit editor and import it in the maxwell. i attach the circuit and the maxwell simulation with the names of circuit and coil with external circuit.

i run this but i don't achieve the 8pT signal @ 50 meter from antenna.

another question is that what value i have to select for the resistance which is series with the sinusoidal source? this value has deep effect in my result.
please help me and suggest me some solution, i don;t have time and i have to simulate it :( :(
thank you
 

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azita3285 said:
construction= 16 turns AWG#12; coil voltage=65Vrms=91Vpeak; frequency=575hz;
azita3285 said:
Rcoil=30.85mohm; Lcoil=.15mH
That inductance at 575Hz has a very low reactance (sub-Ohm). Are you sure the frequency isn't more like 575kHz? That construction with so few turns with that large excitation voltage don't seem to line up, IMO.
 
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