Papers presented at the 22nd EPS conference on controlled fusion & plasma physics by the Alcator C-Mod Group

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Equivalent Young’s Modulus of the Spiral Accumulating Motor Core Including Many Slits and Embossing Interlockings

The motor core is usually manufactured from magnetic steel sheet with press machine. However, usually most parts of the plate are scalped, 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 magnetic steel sheet can be used. However, since the spiral accumulating core has many slits and embossing interlockings, the equivalent Young\u27s modulus is not known. In this study, therefore, the equivalent Young\u27s modulus of the spiral accumulating core is considered in order to find out a good method to fix the core. Here, the finite element method is applied to analyze the permanent magnet motor core, whose layers and slits are periodically arranged. Then, the effects of slits, layers and embossing interlockings on equivalent Young\u27s modulus are discussed. It is found that around the slits the core layer should be considered to have zero elastic modulus because no tangential stress exists. Finally, a convenient method of calculation based on rule of mixture is newly proposed to estimate the equivalent Young\u27s modulus efficiently.11th International Conference on the mechanical behavior of Materials (ICM11), 5-9 June 2011, Como, Ital