What is Permeance?

What is Permeance?

Permeability definition

Permeability is defined as a measure of the ease with which magnetic flux passes through a material or magnetic circuit.

The Permeability formula

The Magnetic Permeability is calculated by dividing the magnetic flux by the product of the number of ampere-turns and the magnetic path length to show its dependence on the magnetic flux and path.

Analogy with conductance

The Permeability in a magnetic circuit is similar to the conductivity in an electrical circuit and measures the degree to which a material allows magnetic flux to flow.

A unit of Permeability

The unit of Permeability is Weber per ampere-turns (Wb/AT) or Henry.

Permeability

The Permeability coefficient is the ratio of the flux density to the strength of the magnetic field and represents the operating point of the magnet on the B-H curve.

Magnetic Permeability calculation formula

Interpolation formula

• u0= Free space permeability (vacuum)

• ur= relative permeability of a magnetic material

• l= Length of magnetic circuit (in meters)

• A= cross-sectional area (square meters)

Magnetic Leakage Coefficient

The ratio of magnetic flux density to magnetic field strength at the working slope of the B-H curve.

The relationship between permeability and magnetic leakage coefficient