B = magnetic flux density H = magnetic field intensity
FIGURE 1.3 Flux linkage visualization.
The magnetic flux density B is defined as the magnetic flux per unit of cross-sectional area a. The magnetic field intensity H is defined as the magnetomotive force per unit of magnetic flux path l. The magnetic permeability \i of the material is defined as the ratio
between the magnetic flux density B and the magnetic field intensity. The permeability can also be obtained graphically from the magnetization curve shown in Fig. 1.4. In the electrical analogy, the current density J, the electric field intensity E, and the electrical conductivity o are defined using ratios of similar physical parameters.
FIGURE 1.4 Magnetization B-H curve showing permeability |x.
Electrical Analogy
Permeability of free space, H/m or (Tm)/A:
Relative permeability:
