Integrated Modeling Tools for Analyses
It is difficult to cover the extensive range of material modeling in just
a few words. However, the logic behind modeling materials can be viewed
as:
Material modeling = material properties + composite materials + external
environment
The accuracy of the materials that are modeled cannot simply be thought
of as improving the quality of the material properties, but rather modeling
the material considering a wide range of variables from modeling composites,
such as laminated steel sheets, to the effects of heat and stress. JMAG
implements a variety of tools to cover the vast range of variables necessary
to model materials accurately.
(1) Material Database with Expertise
JMAG implements a database of material properties that includes magnetic
and loss characteristics provided by the material manufacturers.
JMAG's material database has reliable data that is guaranteed by, and created
with the mastery of the manufacturers. An irreversible demagnetization
analysis can be performed using data for a magnet provided by Hitachi Metals,
or the magnetic characteristics of the stress dependency of a material
provided by Nippon Steel can be used. Each user can also model irreversible
demagnetization or magnetic characteristics of the stress dependency in
JMAG based on this know-how.
(2) Modeling Specific to Composite Materials
It is essential to model members of materials that have laminated steel
sheets or are anisotropic accurately while selecting the appropriate method
for modeling. For instance, mesh is not usually generated to model each
steel sheet. Generally, the laminated steel sheets are modeled using a
block and the analysis load is reduced by specifying the lamination factor.
However, a mesh needs to be generated to model the lamination on the surface
of a motor if the magnetic flux in the axial direction is strong, such
as slim line motors. Tools to increase the accuracy of modeling by selecting
the appropriate method based on the purpose of an analysis is said to be
one of JMAG's strengths.
(3) Accounting for External Environmental Effects using a Coupled Analysis
The material properties vary with stress and temperature. The temperature
and stress dependency not only need to be determined to visualize these
effects, but the temperature distribution and stress distribution also
need to be obtained accurately. JMAG implements a coupled analysis function
that can accurately evaluate the impact of the temperature and stress dependency.
More information about the coupled analysis technology will be introduced
in the next edition of the JMAG Newsletter.
"Powerful Modeling" Achieved Through Experience
The modeling tools generally used for analyses in JMAG have been introduced,
but the larger question of how the various options are actually used has
not been addressed.
The modeling technology in JMAG has been built on a foundation that is
supported by experience that spans 30 years. The modeling tools are utilized
capturing this expertise of the functions to increase the accuracy when
modeling materials, or combining actual measurements into an analysis.
The JMAG analysis engineers have designed a process proven through actual
measurements for developing valid and new methods for modeling.
The God of Design Resides in Detail
The essential aspects of design, such as limit based design, are hidden
in the small but vital "differences" of the members of materials.
JMAG offers modeling tools and powerful analysis functions that cast light
on these minuscule differences.
JMAG will continue to strive to meet the challenges of modeling complicated
materials.
Physical modeling such as coupled analyses will be introduced in the next
edition of the JMAG Newsletter.
|
