Stator core for electric rotary apparatus
A stator core includes a yoke member and a teeth member. The yoke member is in an annular shape. The teeth member includes teeth and connecting portions. The teeth are projected from the yoke member radially inward. The teeth are formed of a steel plate stacked along a circumferential direction. At least one of the connecting portions connects a part of a tip end of one of the teeth in an axial direction with a part of a tip end of an other of the teeth in the axial direction. The one of the teeth and the other of the teeth are adjacent to each other in the circumferential direction.
1. A stator core for a stator of a rotary electric apparatus, the stator core comprising:
a yoke member substantially being in an annular shape; and
a teeth member including a plurality of teeth and a plurality of connecting portions, wherein
the teeth are projected from the yoke member radially inward,
the teeth are formed of a steel plate stacked along a circumferential direction,
at least one of the connecting portions connects a part of a tip end of one of the teeth to a part of a tip end of another of the teeth, and
the one of the teeth and the other of the teeth are adjacent to each other in the circumferential direction, wherein
at least one of the connecting portions includes
a first connector that connects one end of the tip end of one of the teeth in the axial direction to one end of the tip end of the other of the teeth in the axial direction, and
a second connector that connects the other end of the tip end of one of the teeth in the axial direction to the other end of the tip end of the other of the teeth in the axial direction, wherein
the tip end of the one of the teeth, the tip end of the other of the teeth, the first connector and the second connector together form a slit extending along the axial direction between the first connector and the second connector.
2. The stator core according to claim 1 , wherein the teeth member is formed by bending a strip-shaped steel plate.
3. The stator core according to claim 2 , wherein
the teeth member is formed by:
opening a plurality of the slits in the strip-shaped steel plate at predetermined intervals along a longitudinal direction, such that at least one of the slits extends in a width direction; and
bending the strip-shaped steel plate, such that
a center between two of the slits, which are adjacent to each other in the longitudinal direction, is mountain-folded to form a mountain-folded portion, and
a portion between the mountain-folded portion and corresponding one of the slits is valley-folded.
4. The stator core according to claim 1 , wherein
the yoke member has an inner wall having a plurality of grooves, which are distant from each other in the circumferential direction, wherein at least one of the grooves extends in the axial direction, wherein a number of the teeth is substantially equal to a number of the grooves, and
at least one of the teeth is fitted to corresponding one of the grooves.
5. The stator core according to claim 4 , wherein
an outer diameter of the yoke member is D mm,
the number of the grooves is K, and
a ratio K/D is greater than or equal to 1.
6. A stator core for a stator of a rotary electric apparatus, the stator core comprising:
a yoke member substantially being in an annular shape; and
a teeth member including a plurality of teeth and a plurality of connecting portions, wherein
the teeth are projected from the yoke member radially inward,
the teeth are formed of a steel plate stacked along a circumferential direction,
at least one of the connecting portions connects a part of a tip end of one of the teeth to a part of a tip end of another of the teeth, and
the one of the teeth and the other of the teeth are adjacent to each other in the circumferential direction, wherein
at least one of the connecting portions connects an intermediate portion of the tip end of one of the teeth intermediate in the axial direction to an intermediate portion of the tip end of the other of the teeth intermediate in the axial direction, wherein
at least one of the connecting portions, the tip end of the one of the teeth, and the tip end of the other of the teeth together form an H-shape with two slits opening toward either side in the axial direction.
7. A stator core for a stator of a rotary electric apparatus, the stator core comprising:
a yoke member substantially being in an annular shape; and
a teeth member including a plurality of teeth and a plurality of connecting portions, wherein
the teeth are projected from the yoke member radially inward,
the teeth are formed of a steel plate stacked along a circumferential direction,
each of the plurality of connecting portions connects a part of a tip end of one of the teeth to a part of a tip end of another of the teeth, and
the one of the teeth and the other of the teeth are adjacent to each other in the circumferential direction, wherein
the teeth includes a first specific tooth and a second specific tooth, which are at a predetermined distance from each other in the circumferential direction,
an imaginary tubular surface passes through a tip end of each of the teeth,
an imaginary curved line on the imaginary tubular surface connects one end of a tip end of the first specific tooth in the axial direction to another end of a tip end of the second specific tooth in the axial direction, and
the plurality of connecting portions between the first specific tooth and the second specific tooth are arranged substantially along the imaginary curved line.