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

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SUMMARY

The discussion focuses on simulating a coil using Maxwell with specific parameters to achieve an expected 8pT signal at a distance of 50 meters. The coil specifications include a diameter of 12 cm, a length of 84 cm, and a moment of 30 a-m², constructed with 16 turns of AWG#12 wire. Despite attempts using both voltage and external circuit types in Maxwell, the expected signal was not achieved. A critical observation suggests that the frequency may need to be adjusted from 575 Hz to 575 kHz to align with the low reactance of the coil's inductance.

PREREQUISITES
  • Understanding of coil properties and specifications, including diameter, length, and turns.
  • Familiarity with Maxwell simulation software and its transient solution capabilities.
  • Knowledge of electrical parameters such as resistance, inductance, and voltage in AC circuits.
  • Basic principles of electromagnetic theory related to signal propagation and coil behavior.
NEXT STEPS
  • Investigate the impact of frequency adjustments on coil simulations, specifically exploring 575 kHz.
  • Learn about the effects of resistance values in series with sinusoidal sources in AC circuits.
  • Explore advanced features of Maxwell for circuit simulations, including the use of external circuit editors.
  • Research best practices for simulating coil designs to optimize signal output in electromagnetic applications.
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Electrical engineers, simulation specialists, and researchers involved in coil design and electromagnetic field analysis will benefit from this discussion.

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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