Magnetics Business & Technology - November/December 2019 - 11

```FEATURE ARTICLE

2D elements and the coil requires 3D elements. A quick solution is
acquired by using "Automatic All" to instruct the mesh generator to
decide which parts of the model require 2D or 3D elements.
Parametric Analysis
Faraday has "Parametric Analysis" to solve a series of models that
are variations of a single basic design. The model variations are
created during the course of the run according to the range of parameters defined. To solve current problem, a parametric analysis
is setup to move the coil outwards automatically from the center
in 0.5 mm steps. The objective is to compute the change in the
inductance and resistance of the driving-point impedance of the
coil (compared to its value over an unflawed portion of the plate)
as a function of coil position and compare the computed results to
the experimental results. The computed and experimental results
are to be compared by plotting the magnitude of each versus
coil-center position. Unflawed models are also solved to calculate
inductance and resistance through similar parametric set up.

Fig. 4

Results
Circuit parameters mode

Fig. 5
Clearly, the L results are more accurate than the R results. This
is because the calculation made by Faraday gives the impedance, and then divides it into real and imaginary parts. In this
problem, the phase is approximately 89o, so the relative error is
much higher in the real part (resistance) than in the imaginary part
(inductance).

Fig. 2

In order to see the effect of edge of the model and element density, the plate size is increased by 6 mm and the element density is
increased from 1700 to 2300 triangular elements and from 100 to
120 brick elements on plate and coil respectively. The results are
shown in figure four and five and are more accurate as compared
to results in figure two and three.

Fig. 3

Figure two and three shows change in inductance (∆L- mH) and
change in resistance (∆R-ohm) for smaller plate with lesser elements. The orange points are the measure data from T.E.A.M 15
and the blue curves are the Faraday 10.1 results.

www.MagneticsMag.com

Fig. 6
November/December 2019 * Magnetics Business & Technology

11

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Magnetics Business & Technology - November/December 2019

Magnetics Business & Technology - November/Decmber 2019
Contents
Editor’s Choice/ Features
Stromag Designs New Fail-Safe Electromagnetic Brakes for Ships, Harbors and Other Industrial Applications
Solving Eddy Current Non-Destructive Testing Benchmark Problem with Integrated Engineering Software’s Program Faraday
Scientists Print Magnetic Liquid Droplets to Create a Revolutionary New Material at Berkeley National Lab
Research & Development
Product News
Industry News
New Survey Technique for Interstellar Magnetic Fields Developed by University of Wisconsin
Visions
Magnetics Business & Technology - November/December 2019 - Magnetics Business & Technology - November/Decmber 2019
Magnetics Business & Technology - November/December 2019 - Cover2
Magnetics Business & Technology - November/December 2019 - Contents
Magnetics Business & Technology - November/December 2019 - Editor’s Choice/ Features
Magnetics Business & Technology - November/December 2019 - 5
Magnetics Business & Technology - November/December 2019 - Stromag Designs New Fail-Safe Electromagnetic Brakes for Ships, Harbors and Other Industrial Applications
Magnetics Business & Technology - November/December 2019 - 7
Magnetics Business & Technology - November/December 2019 - 8
Magnetics Business & Technology - November/December 2019 - 9
Magnetics Business & Technology - November/December 2019 - Solving Eddy Current Non-Destructive Testing Benchmark Problem with Integrated Engineering Software’s Program Faraday
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