http://www.eit.se/hb/misc/air_coil_calculator

Air coil calculations

Instruction

First check this page for an explanation of terms used in this calculator
http://www.eit.se/hb/misc/air_coil_calculator/explanation_of_parameters/
It is important to do so. Set desired input parameters in the sections below, then press submit at the end.

NOTE! This was tested using firefox, if something is not working check if it works when using firefox.

Dimensions of coil

Define the physical dimensions of the toroidal air coil here.

Length of a coil section
sectionBlockLength_mm

Width of one section/block, value here shall be sectionWindingWidth_mm plus bobin/box walls on each side of it.
sectionBlockWidth_mm

Air gap margin between sections/blocks.
airGapBetweenBlocks_mm

Number of turns in each section, if set to 0 it will be calculated later
sectionNumberOfTurns

Margin from the winding inside section/block to the outer and inner edge of the section/block
distFromCoilWindingToBoxInneEdge_mm

Margin from the winding inside section/block to the side of the section/block
distFromCoilWindingToSide_mm

Number of sections in one entire toroid coil, if increased frequency drops, must be at least 8 and preferably dividable by 4 so (8, 12, 16, 24...) can be used here.
numberOfSections

Properties of used wire

strandDiameterExcludingInsulation_mm

Estimated lacquer layer on each strand of wire
estimatedInsulationThickness_mm

estimate the layer of insulation tape between each layer (if any, put 0.0 here if none, in final version we should have some tape here)
extraLayerInsulation_mm

How much space is needed for one turn of wire on the bobbin compared to a round wire taking up a square. packingFactor

How the thing is configured

Wanted frequency in Hz
desiredTestFrequency

Desired voltage, Test voltage in kV over one coil, voltage over cable will be oneCoilVoltage_Kv * numberOfCoilsInSerial
desiredOneCoilVoltage_Kv

Number of coils to use (more than one coil can be used for higher voltage)
numberOfCoilsInSerial

At full cable load each pair of coil sections are used in parallel, Use a 2 here for that. Use one if all are in serial. (2 is supposed to be default value).
parallelFactor

Put the sum of cable and driver bridge resistance here. Put zero here to get a calculation for coils only. externalResistance_ohm


http://www.eit.se/hb/misc/air_coil_calculator