 Ферриты: понятия, определения, термины, параметры

# TERMINOLOGY Initial magnetic permeability Top marginal loop hysteresis Residual induction Coercive force loss rate Relative tangent of the magnetic loss resistivity Relative temperature coefficient of the initial magnetic permeability the Curie Point Density Losses in the core Ratio of primary inductance Effective parameters of core Initial magnetic permeability, µn:
this is a limit described by the expression: where:
µo–the magnetic permeability of vacuum (4px107of the A/m);
H–the tension of alternating magnetic field;
B–the value of the magnetic induction on the alternating current. Top limit of the hysteresis loop, Bs:
a value of the magnetic induction in conditions of saturation, remaining practically constant at the further increase of the values of tension переменого of the magnetic field (Fig. 1.). Fig. 1. Residual induction, Br:
a value of the magnetic induction after the removal of the magnetic field under the condition of cao of the magnetization reversal of a ferromagnetic (Fig. 1.). Fig. 1. Coercive force, He:
the tension He of the magnetic field, in which the ferromagnetic sample, initially magnetized up to saturation, размагничивается (Fig. 1.). Fig. 1.  Loss factor tanδ:
the Amount of losses on hysteresis and eddy currents Relative tangent of the angle of the magnetic losses, tan δ/µn
the Ratio of the coefficient of losses to the initial magnetic permeability Resistivity, ρ
The electrical resistance of the material length of 1 m and cross-sectional area of 1 m2 Relative temperature coefficient of the initial magnetic permeability, αµ
The dependence of the initial magnetic permeability of temperature, defned by the expression:  The Curie Point
the Critical temperature at which ferromagnetics pass in парамагнетики (Fig. 2.) Fig. 2. Density, δ:
the Ratio of the mass (W) to the volume (V):  Losses in the core, Pe:
Loss in a closed магнитопроводе when the value of induction, determined by expression: where:
V–the voltage drop on the side of a magnetic core, Volts;
f–ac frequency, Hz;
N–the number of turns;
Ae–effective cross-section of the core, cm2. Ratio of primary inductance (одновитковая inductance) – A1
the Ratio of the measured values of inductance (H) to the square of the number of turns. Effective parameters:
C1: permanent core;
le: the effective length of the magnetic path, cm;
Ae: effective cross-section of the core, cm2and
Ve: the effective capacity of the core, cm3.