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AssigneeMitsubishi Electric Corporation
InventorsKazuhiro Shono, Yuki Tamura, Ryohei Uno, Koji Masumoto
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A rotor core in which magnets are embedded is formed by stacking a plurality of steel sheets. Each steel sheet which has a disk shape has: six magnet insertion holes formed so as to allow permanent magnets to be inserted therein as a whole; circumferential-direction bridge portions connecting, in the circumferential direction, radially-outer-side steel sheets each formed at the peripheral part of the steel sheet, between the magnet insertion holes; and radial-direction bridge portions formed between the magnet insertion holes. The circumferential-direction bridge portions and the radial-direction bridge portions have coined portions having decreased sheet thicknesses and protruding in an arc shape in the sheet-thickness direction. The coined portions having decreased sheet thicknesses suppress short-circuit of a magnetic flux between magnetic poles, and formation of the arc shapes absorbs extension of these portions caused by a coining work, to suppress deformation of the steel sheet.
A rotor for rotary electric machine of an em bedded-magnet type in which a magnet is included inside a stacked core formed by stacking a plurality of stacked steel sheets, each steel sheet comprising:
Dependencies are inferred from the claim text.