Air Coil Inductance Formula

[burnit]

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

 

[The Electrician]

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.

 

[oswaler]

I understand your confusion about the different inductance formulas for different types of air coils. The reason for this is that the inductance of a coil is dependent on its physical dimensions and the way it is wound. Different types of air coils, such as single layer spiral, flat wound spiral, and multilayer coils, have different geometries and therefore require different formulas for calculating inductance.

For a jumble wound or random wound air coil, the inductance formula will depend on the specific dimensions and winding pattern of the coil. One possible approach would be to use the multilayer formula, as the winding pattern of a jumble wound coil can be similar to that of a multilayer coil. However, it is always best to consult with the manufacturer or designer of the coil to determine the most accurate formula to use.

There are resources available online that can help with calculating inductance for air coils, such as online calculators and technical articles. You may also find information on inductance formulas in textbooks or technical manuals. It is important to ensure that the formula you use is applicable to the specific type of air coil you are working with.

In conclusion, the inductance formula for a jumble wound or random wound air coil will depend on its specific dimensions and winding pattern. It is best to consult with the manufacturer or use reliable resources to determine the most accurate formula for your specific coil.