What is Permeance?

Encyclopedia
07/17/2024


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


漏磁系数计算公式.jpg


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


磁导率公式.png


  • 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.


漏磁系数曲线.jpg


The relationship between permeability and magnetic leakage coefficient


漏磁系数与磁导率的关系.jpg

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