northwest Multi-Field Coils
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australian electronic gold prospecting forum.com  |  Detector Technology and Electronics and new detectors  |  Detector Coils  |  Topic: Multi-Field Coils 0 Members and 1 Guest are viewing this topic. « previous next »
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IBGold
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« on: Monday July 12 2010 17:22:35 AEST PM »

IBGold Posted: Dec 24 2009, 09:07 AM Photo Reply   


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 Hi Aziz,
After my success building a Duel Field Mono for the Minelab Machines I want to try one with 4 coils a 27" x 18" , 21" x 14" , 15" x 10" and a 9" x 6" I see two ways of doing this one is by winding all the coils in series as I did with the duel field ending up with an inductance of 300 uh and a resistance of .4 ohms or winding all coils at 300 uh and running them in parallel using a gauge of wire so that the total resistance of the 4 coils is .4 ohms can you simulate these scenarios and if they both work which would be best.
All the best to you and your family for Christmas and the New Year.
Best Regards, Ian.   
   
Aziz Posted: Dec 24 2009, 12:35 PM Photo Reply   


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 Hi Ian,

magnetic field visualisation will be available tomorrow (the serial connected one - the parallel configuration is complex to configure and I did forget the usage of the coil software currently).

I assume same number of turns for all sub-coils. But generally, even spaced and same number of turns should get optimum response. I haven't tested such coils yet and looking forward to know your experiences.

Thanks for your wishes, the same to you.

Aziz


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I am the guy, who do not work for krauts anymore! Reason: Child abduction, discrimination, perversity of judge. 
   
IBGold Posted: Dec 24 2009, 06:57 PM Photo Reply   


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 Hi Aziz,
In the series coils starting with the largest 4 turns next 4 turns then 5 turns and the smallest 6 turns but this may change dependent on final inductance in the paralleled coils all would be wound with the required amount of turns to end up at 300 uh and the amount of strands varied to allow each coil to be a quarter of the required resistance IE about 1.6 ohms that is how I see it I will check back here a few days after the Christmas break again thank you.
Regards, Ian.   
   
Aziz Posted: Dec 25 2009, 07:22 AM Photo Reply   


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 Hi Ian,

here is the magnetic field strength distribution of the simplified coil model (related to 1 A coil current):



Aziz



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I am the guy, who do not work for krauts anymore! Reason: Child abduction, discrimination, perversity of judge. 
   
IBGold Posted: Dec 27 2009, 09:04 AM Photo Reply   


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 Hi Aziz,
Can you do the same when you get the time for the one I have already built a duel field series coil the 28" x 18" with 10.75 turns 15" x 10" with 10 turns done that way because I ran out of wire the finished inductance is 261 uh and resistance is .6 ohms not optimum but I now the performance of this coil so then can relate to the expected multi coil performance by the way this coils performance is excelent even though not optimum.
Regards, Ian. [ VK5KIB] 
   
Aziz Posted: Dec 27 2009, 11:52 AM Photo Reply   


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 Hi Ian,

here it is. Same perspective display to the previous one.



Aziz


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I am the guy, who do not work for krauts anymore! Reason: Child abduction, discrimination, perversity of judge. 
   
IBGold Posted: Dec 27 2009, 01:34 PM Photo Reply   


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 Thank you Aziz thats interesting cant wait for the other looks like I had better source some more wire and get the coil former ready Hi!.
Regards, Ian. 
   
IBGold Posted: Jan 10 2010, 09:06 AM Photo Reply   


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 Hi Aziz,
After studing the plots the Duel Field seems to have an overall stronger field and I can see why it works so well I cant wait until you can do a simulation on the paralleled coils I might PM you later when I have my current projects out of the way as I have a few idears that I would like to pass by you when we have time.
Best regards for the year, Ian. (VK5KIB) 
   
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Regards, Ian.
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australian electronic gold prospecting forum.com  |  Detector Technology and Electronics and new detectors  |  Detector Coils  |  Topic: Multi-Field Coils « previous next »
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