What Formula Calculates Inductance for Jumble Wound Air Coils?

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SUMMARY

The inductance calculation for jumble wound air coils is debated among experts, with some suggesting the use of the single layer spiral formula while others advocate for the multilayer formula. The consensus leans towards the multilayer formula as the most applicable, despite challenges in measuring the thickness of the jumble wound layer and calculating the correction factor for conductor spacing. Accurate dimensions and estimations are crucial for effective calculations. Resources for further information on this topic are limited, necessitating community input for clarity.

PREREQUISITES
  • Understanding of inductance and its significance in coil design.
  • Familiarity with single layer and multilayer coil formulas.
  • Knowledge of air core coil construction techniques.
  • Basic skills in measuring and estimating dimensions of coil layers.
NEXT STEPS
  • Research the multilayer inductance formula for air coils.
  • Explore techniques for measuring coil thickness accurately.
  • Investigate correction factors for spacing in jumble wound coils.
  • Look for online resources or forums dedicated to coil design and inductance calculations.
USEFUL FOR

Electrical engineers, hobbyists in coil design, and anyone involved in the construction and analysis of air core inductors will benefit from this discussion.

burnit
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I have noticed there are different Inductance formula's for a various types of air coils & there design, single layer spiral, flat wound spiral, multilayer etc.

My question is for the design of Jumble wound --- Random wound air core coils:

What is the Inductance formula for a Jumble wound---Random wound air coil & the necessary dimension points needed to be taken for the caculation.
Some say you use the single layer spiral air coil formula, others say use the multilayer formula & some say neither apply?

Is there a site that i can go to to look this up or can anybody help me out?

Thank You
 
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I think the multi-layer formula is the one to use. The thickness of the jumble wound layer won't be easy to measure, so you may just have to estimate an average. Also, the correction factor for the spacing of the individual conductors won't be easy to calculate either, but I think the multi-layer formula would be best.
 

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