# TERMINOLOGY

- Initial magnetic permeability, µ
_{n}: - this is a limit described by the expression:

where:

µ

_{o}–the magnetic permeability of vacuum (4px10^{7}of 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, B
_{s}: - 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, B
_{r}: - 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, H
_{e}: - the tension H
_{e}of the magnetic field, in which the ferromagnetic sample, initially magnetized up to saturation, размагничивается (Fig. 1.).

Fig. 1.

- Loss factor tan
_{δ}: - the Amount of losses on hysteresis and eddy currents

- Relative tangent of the angle of the magnetic losses, tan δ/µ
_{n} - 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 m
^{2}

- Relative temperature coefficient of the initial magnetic permeability, α
_{µ} - 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, P
_{e}: - 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;

A

_{e}–effective cross-section of the core, cm^{2}.- Ratio of primary inductance (одновитковая inductance) – A
_{1} - 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, cm
^{2}and - Ve: the effective capacity of the core, cm
^{3}.