Magnetics Business & Technology - November/December 2019 - 13

FEATURE ARTICLE

Conclusion

Simulation results on most popular eddy current nondestructive
testing Benchmark problem TEAM Workshop Problem #15-1 is
validated in Integrated Engineering Software's program, Faraday v10.1. Three different approaches are used for the study,
which concludes that a user wishing to improve on the results
should make the plate larger with more element density. In general, the higher the element density, and the more closely the
geometry matches the real geometry, the better the result will
be - but the longer it will take to obtain it. This study proves that
the Faraday software is very effective for designing nondestructive testing equipment for magnetic sensors.
*
TEAM Workshop Problem #15-1: http://www.compumag.org/jsite/images/stories/TEAM/problem15.pdf

Fig. 13

Using Coils and Windings Editor

Faraday has a specialized feature "Coils and Windings" to
simulate motors and generators because of the large number
of coils and rotational transients and highly nonlinear switching
sources and loads involved in them. This feature defines a set
of coils wound onto the device, number of turns in a defined
area and multi-phase systems with delta/star connections. This
feature can easily overcome challenges like analyzing resistive and inductive requirements, eddy currents and proximity
effects, coupled series and parallel connections with additional
circuit elements. It identifies a set of coils, attach them with the
right polarity and assign them to a winding with the required
source while designing motors, transformers, sensors and
many other devices.
This feature works with Finite Element Method
and is applied to simulate this problem to see
the consistency of results as compared to other
approaches discussed above.
Full model is used for this study. To set up this
feature:
1.
"Coil Type properties" are edited from
"Coils and windings" dialog from "Physics" menu
2.
Coil geometry is selected from "Set
Coil Geometry" and proper current direction is
selected from "Toggle Current Direction".
3.
"Windings" are specified with current
source of 1 Ampere and phase zero.
To solve the model a parametric is setup to
automatically move the coil outwards from the
center in 0.5 mm steps and to record L & R at
each position. L and Rare recorded from "Analysis" menu. L is recorded from flux linkage using
formula L=N*Φ/I and R is recorded from "Power
loss" by using formula P=I2 R where I=1 and N=
3790. Figures 10-13 show change in inductance
and resistance values in the small and large
plate models. The blue points are the Faraday
10.1 results and the orange curves are measured data. The results showed better results for
larger plate model. Hence, we can conclude that
either we use field mode or circuit parameters
mode or coils & winding feature, the results of
larger plate with more elements are better.

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About the Author: Amandeep Bal, Ph.D., is

the Testing and Benchmarking Engineer for
Integrated Engineering Software based in
Winnipeg, Canada. Integrated Engineering
Software develops simulation software programs that analyze a full spectrum of physical
problems, For more information, visit: https://
www.integratedsoft.com

www.ichaus.de/tw11
phone: +49 6135 92 92-300

iC-TW11
10-Bit Ultra Low Power Magnetic
Absolute Rotary Encoder
* Ideal for HMI and portable devices:
only 3 µA current consumption
at 10 Hz sampling rate
* 10-bit angle resolution
* SPI interface
* 3.0 to 3.6 V, - 40 to +125 °C
* Small 16-pin QFN
4 mm×4 mm

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November/December 2019 * Magnetics Business & Technology

http://www.compumag.org/jsite/images/stories/TEAM/problem15.pdf http://www.compumag.org/jsite/images/stories/TEAM/problem15.pdf http://www.integratedsoft.com http://www.integratedsoft.com http://www.ichaus.de/tw11 http://www.MagneticsMag.com

Magnetics Business & Technology - November/December 2019

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