Analysis for Mechanical Properties of Spiral Accumulating Core Used for Permanent Magnet Motor |
| Journal |
Key Engineering Materials (Volumes 385 - 387) |
| Volume |
Advances in Fracture and Damage Mechanics VII |
| Edited by |
H.S. Lee, I.S. Yoon and M.H. Aliabadi |
| Pages |
37-40 |
| DOI |
10.4028/www.scientific.net/KEM.385-387.37 |
| Online since |
July, 2008 |
| Authors |
Nao Aki Noda,
Biao Zhang,
Kazuhiko Yonemaru,
Shota Higo,
Yoshihiro Takamatu
|
| Keywords |
Accumulating, Bending, Deterioration, Finite Element Method (FEM), Spiral |
| Abstract |
Recently, permanent magnet motors are widely used in many industrial fields because
they are suitable for compact mechanical system. The motor core is usually manufactured from
magnetic steel sheet with press machine. However, usually most parts of the plate are scraped, and
only small percent of the sheet is used for the core. The spiral accumulating core system is suitable
for manufacturing the core more ecologically because in this system more than 50% of the magnet
steel sheet can be used. In this study, therefore, the effective Young’s modulus of the spiral
accumulating core is considered in order to find out a good method to fix the core. In this analysis,
the finite element method is applied to 3D models, whose layers and slits are periodically arranged.
Stress and thickness distributions are also analyzed in the bending process. When the spiral core is
manufactured through spiral accumulating system with plate-bending process, the thickness change
should be minimized because that may deteriorate dimensional accuracy of the spiral core. Also
residual bending stress is investigated because that may cause an electric loss. The results indicate
that plastic zone is limited at localized regions and therefore an electric loss is not very large. The
effective Young’s modulus of the 3D dimensions model of the real spiral accumulating core is
estimated about 127.5 GPa. |
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