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Core loss coefficients calculator

QuickField uses the empirical Bertotti formula for the core loss calculation:

p = khf B2 + kcf2B2 + ke(f B)1.5

Here B - magnitude of the module of the flux density vector per period, f - problem frequency, kh, kc, ke - volume power loss coefficients for specific magnetic material.

Usually magnetic material vendors supply each material with the curves or tables of the core loss density vs. flux density on various frequencies. It is possible to approximate these experimental data by Bertotti formula by adjusting the loss coefficients. This process is called "curve fitting".

Frequency f= Hz.
Experimental data: Flux density [T] - Loss density (W/m³).


Bertotti coefficients:
kh=     kc=     ke=
Normalized root-mean-square error of approximation: 0

Off-line version of Core loss coefficients calculator (Microsoft Excel spreadsheet) is used to automate calculation the core loss coefficients on given dataset.

See example laminated core iron loss.

The software is provided "as is" and the author disclaims all warranties with regard to this software including all implied warranties of merchantability and fitness. in no event shall the author be liable for any special, direct, indirect, or consequential damages or any damages whatsoever resulting from loss of use, data or profits, whether in an action of contract, negligence or other tortious action, arising out of or in connection with the use or performance of this software.