How did you get the size of the inductance? That is, what factors determine inductance? How to do the inductor? Then how can we know the inductance we made?

Inductance is determined by the permeability of magnetic conductor, the length of magnetic circuit, the area of magnetic circuit and the number of windings.

The calculation formula of loop inductance is: l = 0.4 * pi * u * n 2 * s/l, where pi=3. 14, u is magnetic permeability, n is winding turns, s is cross-sectional area of magnetic core, and l is effective magnetic circuit length.

The inductance of air-core coil is another calculation formula. For the hollow single-layer coil, l (μ h) = (0.01× d× n× n) ÷ (w ÷ d+0.44).

Hollow multilayer coil: l (μ h) = (0.08× d× d× n× n) ÷ (3× d+9× w+10× h),

Where d is the average diameter (cm) of the coil; W is the width of the coil (cm);

H is the thickness of the coil (cm) and n is the number of turns of the coil.

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