Permeance
Permeance, in general, is the degree to which a material admits a flow of matter or energy. Permeance is usually represented by a curly capital P:.Electromagnetism
In electromagnetism, permeance is the inverse of reluctance. In a magnetic circuit, permeance is a measure of the quantity of magnetic flux for a number of current-turns. A magnetic circuit almost acts as though the flux is conducted, therefore permeance is larger for large cross-sections of a material and smaller for smaller cross section lengths. This concept is analogous to electrical conductance in the electric circuit.
Magnetic permeance is defined as the reciprocal of magnetic reluctance :
which can also be re-written:
using and the definition of magnetomotive force :
where:
Alternatively in terms of magnetic permeability :
where:
The SI unit of magnetic permeance is the henry, that is webers per ampere-turn.In materials science, permeance is the degree to which a material transmits another substance.Electromagnetism
