The coil of inductance is capable to accumulate magnetic energy at course of electric current. Its main characteristic is its inductance which is designated by letter L and is measured in Henry (Gn). The inductance of the coil depends on its features.
It is required to you
- material of the coil and its geometrical parameters
Instruction
1. The inductance of the coil is proportional to the linear sizes of the coil, magnetic permeability of the core and a square of number of rounds of winding. The inductance of the coil which is reeled up on the toroidal core is equal: L =? 0 *? r*s * (N^2)/l. In this formula? 0 — a magnetic constant which is approximately equal 1.26*(10^-6) of Gn/m? r is relative magnetic permeability of material of the core which depends from frequency), s is the cross-sectional area of the core, l there is length of the average line of the core, N is number of rounds of the coil. Relative magnetic permeability and material and also number of rounds of N are dimensionless sizes.
2. Thus, the inductance of the coil of subjects is more, than the area of its section is more. This condition increases a magnetic flux via the coil at the same current in it. The inductance of the coil of inductance in mkgn can be calculated also by a formula: L = L0*(N^2)*D*(10^-3). Here N is number of rounds, D - diameter of the coil in centimeters. The coefficient of L0 depends on the coil length relation to its diameter. For the single-layer coil it is equal: L0 = 1 / (0.1 * (l/D) +0.45)).
3. If in a chain of the coil are connected consistently, then their general inductance is equal to the sum of induktivnost of all coils: L = If coils are connected (L1+L2+...+Ln) in parallel, then their general inductance is equal: L = 1/((1/L1)+(1/L2)+... + (1/Ln))