Rotor with coil airflow paths

A rotor of a rotating electrical machine, the rotor comprising:

• a coil slot configured to store a rotor coil;
• a sub-slot configured to introduce a cooling gas from a core end portion and to pass the cooling gas toward a core central portion in a rotor axial direction;
• and
• a plurality of coil airflow paths arranged in the rotor axial direction, each of the coil airflow paths being provided in the rotor coil and configured to introduce the cooling gas flowing in the sub-slot and to pass the cooling gas toward a rotor radially outward side, such that the cooling gas flowing into the sub-slot branches and flows into the respective coil airflow paths,
• wherein at least one coil airflow path among the coil airflow paths comprises:
• a first wall surface disposed on a core central portion side of a cooling gas inlet portion of the coil airflow path;
• a second wall surface disposed on the core central portion side of an inside of the coil airflow path, and located on an opposite side of a flowing direction of the cooling gas through the sub-slot with respect to the first wall surface, more on the rotor radially outward side and more on a core end portion side than the first wall surface;
• and
• a third wall surface configured to connect the first wall surface and the second wall surface, the third wall surface including a surface perpendicular to a rotor radial direction,
• wherein the at least one coil airflow path is configured such that the cooling gas that enters from the sub-slot toward the first wall surface collides with the third wall surface and thereby flows in a direction opposite a direction of the cooling gas flowing through the sub-slot.