Abstract: To obtain a rotary electric machine in which an insulation failure does not occur even when the output of the rotary electric machine is increased by improving the cooling performance at the rotor winding ends. The rotary electric machine includes a rotor winding wound around a rotor core with a gap, rotor winding ends formed by the rotor winding protruding to an end surface of the rotor core in an axial direction, spacers arranged between adjacent rotor winding ends, mountain-shaped winding support portions provided on both surfaces of the spacers and having an apex with an obtuse angle, meandering ventilation paths formed on both surfaces of the spacers by the mountain-shaped winding support portions and wave-shaped winding support portions formed in the meandering ventilation paths along the meandering ventilation paths.

Abstract: In order to improve cooling performance of a rotor of a rotary electric machine, attention is paid to the relation between the secondary flow of a cooling gas generated inside ventilation holes for the cooling gas provided in a rotor winding formed by stacking a conductor and an interlayer insulating layer and the main flow of the cooling gas during the rotary motion of the rotor, and the secondary flow of the cooling gas is suppressed by changing the shape of bulges appearing in a linear shape in the stacked direction on an inner wall surface of each rotor winding ventilation hole on a negative pressure side.

Abstract: To obtain a rotary electric machine in which an insulation failure does not occur even when the output of the rotary electric machine is increased by improving the cooling performance at the rotor winding ends. The rotary electric machine includes a rotor winding wound around a rotor core with a gap, rotor winding ends formed by the rotor winding protruding to an end surface of the rotor core in an axial direction, spacers arranged between adjacent rotor winding ends, mountain-shaped winding support portions provided on both surfaces of the spacers and having an apex with an obtuse angle, meandering ventilation paths formed on both surfaces of the spacers by the mountain-shaped winding support portions and wave-shaped winding support portions formed in the meandering ventilation paths along the meandering ventilation paths.

Abstract: In order to improve cooling performance of a rotor of a rotary electric machine, attention is paid to the relation between the secondary flow of a cooling gas generated inside ventilation holes for the cooling gas provided in a rotor winding formed by stacking a conductor and an interlayer insulating layer and the main flow of the cooling gas during the rotary motion of the rotor, and the secondary flow of the cooling gas is suppressed by changing the shape of bulges appearing in a linear shape in the stacked direction on an inner wall surface of each rotor winding ventilation hole on a negative pressure side.

Abstract: A variable conductance heat pipe is provided. The variable conductance heat pipe includes a sealed container in which a working fluid and a noncondensable gas are sealed. The sealed container includes a heat receiving portion to which an element to be cooled is provided, and heat radiating portion. An amount of heat is supplied to the heat receiving portion when the element to be cooled is in a waiting state.

Abstract: A variable conductance heat pipe is provided. The variable conductance heat pipe includes a sealed container in which a working fluid and a noncondensable gas are sealed, the sealed container extending in an axial direction. The sealed container includes one end to be connected to a heating source and a part to be connected to a heat sink. On a cross section of the sealed container along a direction orthogonal to the axial direction, a portion having water conveying property better than other portions is provided. The portion having the better water conveying property extends in the axial direction.