Stator core for rotating electric machine

A stator core for a rotating electric machine, comprising:

• a plurality of split cores each separately formed by laminating a plurality of steel plates in an axial direction, the split cores being arranged in an annular shape,
• wherein each of the split cores includes
• a back yoke that has a specified radial width and extends in an arc shape,
• a tooth that projects from a circumferentially middle portion of the back yoke to a radially inner side, a coil being wound around the tooth, and
• a single caulking portion, the laminated plurality of steel plates being fastened to one another so as to be integrally secured to one another by using the caulking portion, the caulking portion being formed in the back yoke,
• wherein, the caulking portion has a projection portion having a triangular region, which projects toward the radially inner side and projects toward one side in the axial direction, and a recess portion formed in a rear surface of the projection portion and having a region, which has the same shape as that of the projection portion and is recessed toward the one side in the axial direction, in each of the specific steel plates so as to have a flat caulking shape,
• wherein the projection portion of each of the specific steel plates is engaged with the recess portion of another steel plate adjacent thereto in a laminating direction so as to be fastened to one another, and
• wherein, when each of the split cores is seen in the axial direction, two inner circumferential-side intersections and two outer circumferential-side intersections are defined, both circumferential-end surfaces of the tooth intersect an inner circumferential surface of the back yoke at the two inner circumferential-side intersections, virtual lines drawn by extending both the circumferential-end surfaces of the tooth intersect an outer circumferential surface of the back yoke at the two outer circumferential-side intersections, and the caulking portion is disposed in an opposing angular region on a radially outer side out of four opposing angular regions defined by lines diagonally connecting the two inner circumferential-side intersections to the respective two outer circumferential-side intersections.

A stator core for a rotating electric machine, comprising:

• a plurality of split cores arranged in an annular shape, each of the plurality of split cores comprising a plurality of steel plates laminated in an axial direction of the annular shape, each of the plurality of split cores comprising:
• a back yoke having an arc shape extending along a circumferential direction of the annular shape and having a specified width in a radial direction of the annular shape;
• a tooth projecting from a circumferentially middle portion of the back yoke inwardly in the radial direction, a coil being to be wound around the tooth;
• and
• a single caulking portion provided in the back yoke, the plurality of steel plates laminated in the axial direction being fastened to one another so as to be integrally secured to one another using the caulking portion, the caulking portion comprising:
• a projection portion having a rectangular region, which has short sides and long sides and which projects toward one side in the axial direction;
• a recess portion formed in a rear surface of the projection portion and having a region, which has a same shape as a shape of the projection portion and is recessed toward the one side in the axial direction, in each of the specific steel plates so as to have a flat caulking shape;
• the projection portion of each of the specific steel plates being engaged with the recess portion of another steel plate adjacent thereto in a laminating direction so as to be fastened to one another;
• when each of the plurality of split cores is seen in the axial direction, two inner circumferential-side intersections and two outer circumferential-side intersections being defined, both circumferential-end surfaces of the tooth intersecting an inner circumferential surface of the back yoke at the two inner circumferential-side intersections, virtual lines drawn by extending both the circumferential-end surfaces of the tooth intersecting an outer circumferential surface of the back yoke at the two outer circumferential-side intersections, a central position of the caulking portion being disposed in an opposing angular region on a radially outer side out of four opposing angular regions defined by lines diagonally connecting the two inner circumferential-side intersections to the respective two outer circumferential-side intersections;
• and
• the long sides of each of the caulking portions extending in the radial direction.

A stator core for a rotating electric machine, comprising:

• a plurality of split cores arranged in an annular shape, each of the plurality of split cores comprising a plurality of steel plates laminated in an axial direction of the annular shape, each of the plurality of split cores comprising:
• a back yoke having an arc shape extending along a circumferential direction of the annular shape and having a specified width in a radial direction of the annular shape;
• a tooth projecting from a circumferentially middle portion of the back yoke inwardly in the radial direction, a coil being to be wound around the tooth, and
• a single caulking portion provided in the back yoke, the plurality of steel plates laminated in the axial direction being fastened to one another so as to be integrally secured to one another using the caulking portion, the caulking portion comprising:
• a projection portion having a triangular region, which projects toward a radially inner side and projects toward one side in the axial direction;
• a recess portion formed in a rear surface of the projection portion and having a region, which has a same shape as a shape of the projection portion and is recessed toward the one side in the axial direction, in each of the specific steel plates so as to have a flat caulking shape;
• the projection portion of each of the specific steel plates being engaged with the recess portion of another steel plate adjacent thereto in a laminating direction so as to be fastened to one another;
• and
• when each of the plurality of split cores is seen in the axial direction, two inner circumferential-side intersections and two outer circumferential-side intersections being defined, both circumferential-end surfaces of the tooth intersecting an inner circumferential surface of the back yoke at the two inner circumferential-side intersections, virtual lines drawn by extending both the circumferential-end surfaces of the tooth intersecting an outer circumferential surface of the back yoke at the two outer circumferential-side intersections, the caulking portion being disposed in an opposing angular region on a radially outer side out of four opposing angular regions defined by lines diagonally connecting the two inner circumferential-side intersections to the respective two outer circumferential-side intersections.