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A cooling gas ventilation circuit is provided for an end winding of a rotary machine having a rotor of the type having a plurality of radial slots and a plurality of coils respectively seated in the radial slots, the coils extending beyond a pole face of the rotor to form the end winding. The ventil

A cooling gas ventilation circuit is provided for an end winding of a rotary machine having a rotor of the type having a plurality of radial slots and a plurality of coils respectively seated in the radial slots, the coils extending beyond a pole face of the rotor to form the end winding. The ventilation circuit is composed of first and second cooling gas passages, respectively defined in at least one turn of each coil of the end winding. Each first cooling gas passage extends from an inlet port in communication with a cavity on one longitudinal side of the turn to an exit port defined on the other longitudinal side of the turn. Each second cooling gas passage extends from an inlet port in communication with the cavity on the one longitudinal side of the turn to an outlet in the form of a radial chimney defined through a plurality of the turns of the coil within the respective radial slot. In the presently preferred embodiment, the second passage is longitudinally offset in the coil structure with respect to the first cooling passage, so that they serve to cool respective portions of the coil. The passages may be but are not necessarily defined in the same turn of their respective coil.

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1. A cooling gas ventilation circuit for an end winding of a rotary machine having a rotor, a plurality of radial slots provided in said rotor, and a plurality of coils respectively seated in said radial slots, said coils each comprising a plurality of radially stacked turns, said coils extending be

1. A cooling gas ventilation circuit for an end winding of a rotary machine having a rotor, a plurality of radial slots provided in said rotor, and a plurality of coils respectively seated in said radial slots, said coils each comprising a plurality of radially stacked turns, said coils extending beyond a pole face of the rotor to form an end winding, cavities being defined between adjacent pairs of said coils, said ventilation circuit comprising:a first cooling gas passage defined in at least one turn of each said coil of said end winding, said first cooling gas passage extending from an inlet port in communication with the cavity on one longitudinal side of said turn to an exit port defined on the other longitudinal side of said turn, said first cooling gas passage extending along at least a portion of the longitudinal extent of said turn; and a second cooling gas passage defined in at least one turn of each said coil of said end winding, said second cooling gas passage extending from an inlet port in communication with said cavity on said one longitudinal side of said turn to a radial chimney defined through a plurality of the turns of the coil within said respective radial slot, said second passage being longitudinally offset with respect to said first cooling passage, wherein said rotor is formed with a vent passage extending from said pole face in an area of said rotor between said radial slots in which said coils are seated, at an axial end of the cavity defined between said slots, said exit port of said first gas passage being defined adjacent said vent passage, further comprising a ventilated block disposed intermediate said exit port and said vent passage for conducting cooling gas from said exit port to said vent slot and for substantially isolating said cooling gas from said cavity defined between said slots.