Laminated core, dynamo-electric machine, method for producing laminated core, and method for producing dynamo-electric machine

1 . A stacked core formed by stacking a plurality of first core sheets and second core sheets stamped from an electromagnetic steel sheet, wherein

each first core sheet is formed such that a sheet thickness thereof increases from one side toward another side,

each second core sheet is formed such that a sheet thickness thereof increases from the other side toward the one side,

the first core sheets and the second core sheets are alternately stacked per predetermined number of sheets,

the stacked core has a core back to form an annular shape when a plurality of the core backs are arranged in a circumferential direction, and one tooth protruding in a radial direction from the core back,

each first core sheet is formed such that the sheet thickness thereof increases from an end side of the tooth which is the one side toward the core back side which is the other side in the radial direction, and

each second core sheet is formed such that the sheet thickness thereof increases from the other side toward the one side in the radial direction.

2 . A stacked core formed by stacking a plurality of first core sheets and second core sheets stamped from an electromagnetic steel sheet, wherein

each first core sheet is formed such that a sheet thickness thereof increases from one side toward another side,

each second core sheet is formed such that a sheet thickness thereof increases from the other side toward the one side,

the first core sheets and the second core sheets are alternately stacked per predetermined number of sheets,

the stacked core has a core back to form an annular shape when a plurality of the core backs are arranged in a circumferential direction, and one tooth protruding in a radial direction from the core back,

each first core sheet is formed such that the sheet thickness thereof increases from one circumferential-direction end side of the core back which is the one side toward another circumferential-direction end side of the core back which is the other side in the circumferential direction, and

each second core sheet is formed such that the sheet thickness thereof increases from the other side toward the one side in the circumferential direction.

3 . A rotary electric machine comprising:

a stator formed by arranging, in an annular shape, a plurality of the stacked cores according to claim 1 ; and

a rotor provided so as to be opposed to the stator via an air gap.

4 . A stacked core production method for forming the stacked core according to claim 1 by stacking the plurality of core sheets stamped from the electromagnetic steel sheet of which a sheet thickness differs along a sheet width direction, the method comprising:

a stamping step of stamping a plurality of the core sheets at different positions in the sheet width direction of the electromagnetic steel sheet at the same time, to form a plurality of kinds of the core sheets having different sheet thicknesses;

an alignment step of stacking the plurality of kinds of core sheets in a predetermined order and per predetermined number of sheets, and aligning the stacked core sheets, to form a core sheet set; and

a fixation step of fixing the core sheet set in a stacking direction.

5 . A stacked core production method for forming the stacked core according to claim 2 by stacking the plurality of core sheets stamped from the electromagnetic steel sheet of which a sheet thickness differs along a sheet width direction, the method comprising:

a stamping step of stamping a plurality of the core sheets at different positions in the sheet width direction of the electromagnetic steel sheet at the same time, to form a plurality of kinds of the core sheets having different sheet thicknesses;

an alignment step of stacking the plurality of kinds of core sheets in a predetermined order and per predetermined number of sheets, and aligning the stacked core sheets, to form a core sheet set; and

a fixation step of fixing the core sheet set in a stacking direction.

6 . A stacked core production method for producing the stacked core according to claim 1 , the method comprising:

a stamping step of stamping the first core sheets and the second core sheets from the electromagnetic steel sheet of which the sheet thickness differs along a sheet width direction;

an alignment step of forming a core sheet set in which the first core sheets and the second core sheets are alternately stacked per predetermined number of sheets and are aligned; and

a fixation step of fixing the core sheet set in a stacking direction, wherein

in the stamping step, each first core sheet and each second core sheet are stamped with their respective tooth end sides reversed from each other in the sheet width direction of the electromagnetic steel sheet, or each first core sheet and each second core sheet are stamped with their respective tooth end sides reversed from each other in a rolling direction of the electromagnetic steel sheet.

7 . A stacked core production method for producing the stacked core according to claim 2 , the method comprising:

a stamping step of stamping the first core sheets and the second core sheets from the electromagnetic steel sheet of which the sheet thickness differs along a sheet width direction;

an alignment step of forming a core sheet set in which the first core sheets and the second core sheets are alternately stacked per predetermined number of sheets and are aligned; and

a fixation step of fixing the core sheet set in a stacking direction, wherein

in the stamping step, each first core sheet and each second core sheet are stamped with their respective tooth end sides reversed from each other in the sheet width direction of the electromagnetic steel sheet, or each first core sheet and each second core sheet are stamped with their respective tooth end sides reversed from each other in a rolling direction of the electromagnetic steel sheet.

8 . The stacked core production method according to claim 6 , wherein

in the alignment step, in synchronization with the stamping step, at least either the first core sheet or the second core sheet is stacked for the predetermined number of sheets, and when the predetermined number of sheets are stacked, rotation is performed by 180 degrees in a horizontal direction and the second core sheet or the first core sheet different from the stacked first core sheet or second core sheet is stacked so as to be aligned, to form the core sheet set.

9 . A stacked core production method for producing a stacked core formed by stacking a plurality of first core sheets and second core sheets stamped from an electromagnetic steel sheet, wherein

each first core sheet is formed such that a sheet thickness thereof increases from one side toward another side,

each second core sheet is formed such that a sheet thickness thereof increases from the other side toward the one side, and

the first core sheets and the second core sheets are alternately stacked per predetermined number of sheets,

the method comprises:

a stamping step of stamping the first core sheets and the second core sheets from the electromagnetic steel sheet of which the sheet thickness differs along a sheet width direction;

an alignment step of forming a core sheet set in which the first core sheets and the second core sheets are alternately stacked per predetermined number of sheets and are aligned; and

a fixation step of fixing the core sheet set in a stacking direction,

in the stamping step, each first core sheet and each second core sheet are stamped with their respective tooth end sides reversed from each other in the sheet width direction of the electromagnetic steel sheet, or each first core sheet and each second core sheet are stamped with their respective tooth end sides reversed from each other in a rolling direction of the electromagnetic steel sheet, and

in the alignment step, the first core sheets and the second core sheets are put into different entrances, and until reaching an exit where the first core sheets and the second core sheets are merged, directions of the tooth end sides of the first core sheets and the second core sheets are aligned with each other to form the core sheet set.

10 . The stacked core production method according to claim 9 , wherein

in the alignment step, the first core sheets and the second core sheets of which the directions of the tooth end sides are aligned with each other are alternately stacked by a gear, to form the core sheet set.

11 . The stacked core production method according to claim 9 , wherein

in the alignment step, the directions of the tooth end sides of the first core sheets and the second core sheets are aligned with the direction of the tooth end sides of either the first core sheets or the second core sheets stamped in the stamping step, to form the core sheet set.

12 . The stacked core production method according to claim 10 , wherein

in the alignment step, the directions of the tooth end sides of the first core sheets and the second core sheets are aligned with the direction of the tooth end sides of either the first core sheets or the second core sheets stamped in the stamping step, to form the core sheet set.

13 . The stacked core production method according to claim 9 , wherein

in the alignment step, the directions of the tooth end sides of the first core sheets and the second core sheets are aligned with a direction different from the directions of the tooth end sides of the first core sheets and the second core sheets stamped in the stamping step, to form the core sheet set.

14 . The stacked core production method according to claim 10 , wherein

in the alignment step, the directions of the tooth end sides of the first core sheets and the second core sheets are aligned with a direction different from the directions of the tooth end sides of the first core sheets and the second core sheets stamped in the stamping step, to form the core sheet set.

15 . A stacked core production method for producing a stacked core formed by stacking a plurality of first core sheets and second core sheets stamped from an electromagnetic steel sheet, wherein

each first core sheet is formed such that a sheet thickness thereof increases from one side toward another side,

each second core sheet is formed such that a sheet thickness thereof increases from the other side toward the one side, and

the first core sheets and the second core sheets are alternately stacked per predetermined number of sheets,

the method comprises:

a stamping step of stamping the first core sheets and the second core sheets from the electromagnetic steel sheet of which the sheet thickness differs along a sheet width direction;

an alignment step of forming a core sheet set in which the first core sheets and the second core sheets are alternately stacked per predetermined number of sheets and are aligned; and

a fixation step of fixing the core sheet set in a stacking direction,

in the stamping step, each first core sheet and each second core sheet are stamped with their respective tooth end sides reversed from each other in the sheet width direction of the electromagnetic steel sheet, or each first core sheet and each second core sheet are stamped with their respective tooth end sides reversed from each other in a rolling direction of the electromagnetic steel sheet, and

in the alignment step,

where a rotary plate rotates about a rotational movement center and has a through hole for storing the first core sheet and the second core sheet by connecting with each of paths for the first core sheets and the second core sheets stamped in the stamping step,

in synchronization with the stamping step, the rotary plate rotates by such an angle that the through hole corresponds to each of the paths for the first core sheets and the second core sheets, to store and stack the first core sheet and the second core sheet in the through hole of the rotary plate, and

in a state in which the rotary plate is at an angle where the through hole is not connected with the path for the first core sheets and the path for the second core sheets, the stacked first core sheet and second core sheet are ejected from the through hole of the rotary plate, to form the core sheet set.

16 . The stacked core production method according to claim 15 , wherein

in the alignment step,

in a case where the paths for the first core sheets and the second core sheets are in such a positional relationship that the paths coincide with each other when rotationally moving by an angle obtained by dividing 360 degrees by an integer not less than 2,

in synchronization with the stamping step, the rotary plate having three or more of the through holes at positions arranged at equal intervals about the center is rotated by an angle obtained by further dividing, by an integer not less than 1, the angle obtained by dividing 360 degrees by the integer not less than 2, to stack the first core sheet and the second core sheet in the through holes of the rotary plate.

17 . The stacked core production method according to claim 4 , wherein

in the fixation step, a part of a side surface along the stacking direction of the core sheet set is adhered by an adhesive, to form an adhesion portion.

18 . The stacked core production method according to claim 4 , wherein

in the fixation step, a part along the stacking direction of the core sheet set is welded to form a welded portion.

19 . The stacked core production method according to claim 4 , wherein

in the fixation step, the core sheet set is fixed by winding a coil around the core sheet set.

20 . A rotary electric machine production method comprising:

forming a stator by arranging, in an annular shape, a plurality of the stacked cores produced by the stacked core production method according to claim 4 ; and

providing a rotor so as to be opposed to the stator via an air gap.