Rotor and rotary electric machine having the same

A rotor for a rotary electric machine, the rotor comprising:

• a core main part having a central axis;
• a central hole part passing through the core main part along the central axis;
• a projection part projected from an inner wall of the central hole part toward the central axis and arranged in a circumferential direction with an equal interval;
• an opening part passing through the core main part in a direction parallel to the central axis and being arranged in the circumferential direction with an equal interval;
• a rib part defined between two of the opening parts adjacent with each other in the circumferential direction;
• a pole part formed on a radially outer wall of the core main part and arranged in the circumferential direction with an equal interval;
• a first annular part having a ring shape defined between the central hole part and the opening part in a radial direction;
• a second annular part having a ring shape defined between the opening part and the pole part in the radial direction;
• and
• a magnet disposed at a position corresponding to the pole part, wherein
• a first imaginary straight line is defined to extend outward in the radial direction from the central axis through a center of the projection part in the circumferential direction,
• a second imaginary straight line is defined to extend outward in the radial direction from the central axis through a center of the rib part in the circumferential direction,
• the projection part is formed so that the first imaginary straight line passes the opening part,
• the rib part is formed so that the second imaginary straight line passes a center of the pole part;
• the rib part is one of a plurality of rib parts;
• the projection part is one of a plurality of projection parts;
• and
• the plurality of rib parts and the plurality of projection parts are alternately arranged in the circumference direction, and do not overlap with each other in the radial direction.