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

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.

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.

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.