Rotor core, rotor, motor, manufacturing method of rotor core, and manufacturing method of rotor

A manufacturing method of a rotor core in which a plurality of laminate steel plates extending in a radial direction with respect to a central axis are laminated in an axial direction, the method comprising:

• laminating divided laminate steel plates in the axial direction, each of the divided laminate steel plates including a base portion positioned on a radially outer side of the central axis, and a plurality of pieces separately disposed on a radially outer side of the base portion with penetrating portions therebetween, and arranged side by side at predetermined intervals in a circumferential direction;
• laminating a connected laminate steel plate including the base portion and the pieces connected via connecting portions at an upper end in the axial direction of the divided laminate steel plates that are laminated;
• laminating an intervening laminate steel plate including intervening portions that intervene between the base portion and the pieces at a lower end in the axial direction of the divided laminate steel plates that are laminated;
• and
• cutting the connecting portions with a cutter by inserting the cutter into the penetrating portions;
• wherein
• a laminated steel plate disposed at an upper end in the axial direction includes at least one of an outward projection extending radially outward from an outer edge portion of the base portion and an inward projection extending radially inward from an inner edge portion of the pieces;
• the outward projection or the inward projection bends toward the penetrating portions;
• each of the penetrating portions includes a first penetrating portion and a second penetrating portion with a narrower radial width than the first penetrating portion;
• and
• a bent portion of the outward projection or the inward protection is accommodated inside the first penetrating portion.