QUESTION:

Do you have examples demonstrating a method for calculating net flux passing through a coil? My objective is to use time varying flux in a harmonic response or transient analysis to calculate induced EMF in a sense coil of an eddy current probe.


ANSWER:

The attached zip file contains a 30 degree sector of a simple air coil modeled 2 ways:

1) SOLID97 MVP (flux calculated with surface integral of B_normal and also with FLUXV.MAC)
2) SOLID117 edge flux formulation (flux calculated with surface integral of B_normal - FLUXV.MAC is not applicable).

In both models, the coil is current fed (BFE,,JS...) and has a uniform current density over its cross section, just as a stranded coil would. In a sensor application, the sense coil current will be negligible so no current excitation should be defined in it. Coil current excitation should instead be defined in the drive coil.


QUESTION:

Do you have examples demonstrating a method for calculating net flux passing through a coil? My objective is to use time varying flux in a harmonic response or transient analysis to calculate induced EMF in a sense coil of an eddy current probe.


ANSWER:

The attached zip file contains a 30 degree sector of a simple air coil modeled 2 ways:

1) SOLID97 MVP (flux calculated with surface integral of B_normal and also with FLUXV.MAC)
2) SOLID117 edge flux formulation (flux calculated with surface integral of B_normal - FLUXV.MAC is not applicable).

In both models, the coil is current fed (BFE,,JS...) and has a uniform current density over its cross section, just as a stranded coil would. In a sensor application, the sense coil current will be negligible so no current excitation should be defined in it. Coil current excitation should instead be defined in the drive coil.





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