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HOME : TECHNOLOGY CENTER : APPLICATIONS : PERMEANCE COEFFICIENTS Permeance Coefficients (Pc) are important in material selection to ensure optimal design. The Permeance Coefficient of a magnet is also referred to as the "operating slope", load line or B/H of the magnet in open circuit condition. It is calculated from the dimensions of the magnet and represents the Pc of the magnet in open circuit condition, that is, with no other permanent or soft magnetic material "nearby". These, as most Permeance calculations, are based upon simplified equations of geometry and approximations of the effective length of the material. The results are, therefore, only approximate. The calculated value represents the Pc at the neutral cross-section of the magnet. Our experience suggests the calculated results to be within about 10% of the measured values. A quite "readable" explanation of the calculation of Pc is available on pages 149-154 of Rollin J. Parker's book Advances in Permanent Magnetism. See our Reference Book list. Please select which Permeance Coefficient calculation best suits your application by referring to the diagrams. Axial Cylinder Pc Calculation Transverse Cylinder Pc Calculation Hollow Axial Cylinder Pc Calculation Rectangle Pc Calculation Accuracy Statement While we make every effort to ensure that the information contained in these documents is complete and accurate, we make no warranty regarding this. Please see our disclaimer statement. We would appreciate your input regarding corrections, additions and suggestions for improvement (). TOP | BACK | HOME | HELP | MAP | CONTACT Copyright © Arnold Magnetic Technologies Corporation. All Rights Reserved. Please send all web related questions/comments to the Webmaster.