Rotating electrical machine

A rotating electrical machine comprising:

• a rotor disposed on an outer periphery of a rotating shaft and configured to rotate along with the rotating shaft;
• a stator configured to enclose the rotor;
• and
• a fluid control mechanism configured to create, on an outer periphery of the rotor, a flow of a fluid directed from one side toward the other side in an axial direction of the rotating shaft,
• wherein the fluid control mechanism includes:
• a first member that is disposed on the outer periphery of the rotating shaft, is configured to rotate along with the rotating shaft, has a portion at which an outside diameter of the first member increases gradually from the one side toward the other side, and is configured such that a shape of an outer circumferential surface of the first member is continuous with a shape of an outer circumferential surface of an end portion, in the axial direction, of the rotor;
• and
• a second member that is disposed on an inner periphery of the stator so as to be separated by a gap from the first member and the rotor, and is configured such that an inside diameter of the second member increases gradually from the one side toward the other side at a portion facing the portion of the first member at which the outside diameter increases gradually.