EMI (Electromagnetic Interference)
A useful definition of EMI noise is any signigicant signal energy that causes unintended, undesirable circuit function or inadequate EMC performance.
AC Initial Permeability ( μ iac)
This is the limit value of magnetic core permeability at the origin of the virgin magnetization curve. It's given by the following formula:
Inductance (L):
The magnetic flux linkages in Maxwells-turns per ampere of magnetizing current.
Inductance Factor (AL)
Inductance factor is defined as the self inductance per unit turn of a coil of a given shape and dimension wound on a magnetic core, and is determined by the following formula:
Quality Factor (Q):
The efficiency of an inductor, that is the ratio of series inductive reactance to loss resistance.
Loss factor (tan δ):
Deviation from ideal phase angle (90 ° ) due to losses.
Relative Loss Factor (tan δ /μ iac)
Losses per unit of permeability. Figure merit of a material.
Curie Temperature (Tc):
emperature at which a ferromagnetic material loses its ferromagnetism and becomes paramagnetic( μ approaches 1)
Relative Temperature Coefficient of lnitial permeability ( αμ r):
This is the value obtained by dividing the temperature coefficient of the initial permeability( αμ ) by the initial permeability.
Specific Gravity (d)
It's calculated from its volume and weight, as shown below:
