| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotor core capable of maintaining a high rigidity and a manufacturing method thereof with satisfactory material yield and superior in economic efficiency.SOLUTION: The rotor core includes: a shaft securing core 5 that supports and secures a rotation axis 6; an inner yoke 3 having a rectangular shape disposed at the outer side of the shaft securing core 5; and plural divided yokes 4 disposed on the circumference of the inner yoke 3. The rotor core is arranged so that the cross-sectional area in a direction perpendicular to the axial direction between the inner yoke 3 and the shaft securing core 5 is greater than a sum of cross-sectional area of the plural divided yokes 4 in a direction perpendicular to the axial direction. The circumference of the rotor core is formed by forming a single circle with the circumference of the inner yoke 3 and the circumference of the plural divided yokes 4. |
