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AssigneesHitachi, Ltd., Japan Servo Co., Ltd.
InventorsYuuji Enomoto, Masashi Kitamura, Toshimi Abukawa, Yuji Takagai
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A core has an annular inner core portion, a rib-shaped core portion extending radially from the annular inner core portion and an outer peripheral core portion. Magnetic pole tooth portions are formed in an annular shape on the outer periphery of the rib-shaped core portion, and the core is composed of a plurality of core blocks having the same shapes as blocks formed by dividing the core in circumferential direction. Each of the plurality of core blocks has a concave/convex engage portion at an inner peripheral portion corresponding to the inner periphery of the annular inner core portion, and the plurality of core blocks gathered so as to form the core are fastened each other by a cylindrical housing having an outer surface formed in concave/convex shape, inserted in the inner peripheral portion so as to engage with each other at the concave/convex engage portions, and changed in diameter relative to the core blocks due to thermal shrinkage or expansion of the cylindrical housing, so that the core blocks are tightly fitted to each other without any gap between adjacent core blocks.
A stator core comprising an annular inner core portion, a rib-shaped core portion extending radially from said annular inner core portion, and an outer peripheral core portion, magnetic pole tooth portions being formed in an annular shape on the outer periphery of said rib-shaped core portion, wherein
An electric rotating machine comprising a stator and a rotor, wherein said stator has a stator core having an annular inner core portion, a rib-shaped core portion extending radially from said annular inner core portion, and an outer peripheral core portion, magnetic pole tooth portions being formed in an annular shape on the outer periphery of said rib-shaped core portion, said stator core is composed of a plurality of core pieces having the same shapes as pieces formed by dividing said stator core in a circumferential direction, each of said plurality of core pieces having a concave/convex engage portion at an inner peripheral portion corresponding to an inner periphery of said annular inner core portion, and said plurality of core pieces are fastened to each other by a cylindrical housing having an outer surface formed in a concave/convex engage portion and inserted in said inner peripheral portion so as to engage with the core pieces at said concave/convex engage portions, said plurality of core pieces being fastened tightly to each other by shrinkage or expansion fit of said cylindrical housing.
A stator core comprising an annular inner core portion, a rib-shaped core portion extending radially from said annular inner core portion, and an outer peripheral core portion, magnetic pole tooth portions being formed in an annular shape on the outer periphery of said rib-shaped core portion, wherein
Dependencies are inferred from the claim text.