Effect of magnetic core on winding inductance

Effect of magnetic core on winding inductance
I-shaped inductors, R-bar inductors, magnetic-ring inductors, and most of the chip power inductors are typical winding inductors. Their common feature is that the core is wrapped around the enameled wire. The influence of the core on the winding inductance includes the sense of inductance, DCR, rated current, etc. This effect is related to the material, size and the like of the core.
1. Influence of magnetic core material on winding inductance
Different magnetic core materials have different magnetic fluxes. If other factors remain unchanged, the replacement of the shape and size of the magnetic core of different materials will affect the inductance of the winding inductance.
According to the inductance of the winding inductance, the formula L=(k*μ0*μs*N*N*S)/l is known. The higher the magnetic permeability μs of the core material, the higher the inductance of the winding inductance.
2, the influence of the size of the core on the winding inductance
We know that a coil with a magnetic core has a larger inductance than an air-core coil. The core has an enhanced effect on the inductance of the wound inductor. In general, in the case of ensuring that the number of winding inductances is constant, we can calculate another inductance quantity L = μ × S * (N * N) / l know: the thicker the core (increased core diameter) When S becomes larger, the inductance is larger. If it is ensured that the other core parameters are increased, the diameter of the core is increased, the sense value becomes smaller, the DCR becomes larger, and the DC superposition capability becomes larger. The reason is that the copper wire blocks the magnetic flux, makes the magnetic circuit become longer, and the total magnetic resistance becomes larger, L=N^2/R, R becomes larger, and L becomes smaller. In addition, the size of the core will affect the package size of the winding inductor. The larger the core size, the larger the package size of the inductor.

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