Abstract: A cooling gas ventilation chimney is provided for enhancing the heat transfer of an end region of a dynamoelectric machine. The dynamoelectric machine includes a rotor having a plurality of radial slots. A plurality of coils are seated in the radial slots, and the coils form a plurality of radially stacked turns. The ventilation chimney includes one or more chimney slots defined in at least a portion of the radially stacked turns. The chimney slots extend in a substantially radial direction to the rotor, and some of the chimney slots have an axial or circumferential length different from other chimney slots.

Abstract: A rotor is provided for a dynamoelectric machine having one or more windings. The windings have one or more turns, and the turns have one or more outlet ducts that are located near a chimney. When the outlet ducts are stacked one on top of another, they form substantially radially oriented passages. The heat transfer performance of a portion of the rotor can be improved by locating two or more circumferentially spaced radial ducts near the chimney. A chimney can also be formed of one or more chimney slots defined in at least a portion of the turns, where one or more chimney slots extend in a substantially slanted direction to a radial direction of the rotor. A transition region of the rotor can also include one or more diagonal flow channels, which discharge into one or more chimneys.

Abstract: A rotor is provided for a dynamoelectric machine having one or more windings. The windings have one or more turns, and the turns have one or more outlet ducts that are located near a chimney. When the outlet ducts are stacked one on top of another, they form substantially radially oriented passages. The heat transfer performance of a portion of the rotor can be improved by locating two or more circumferentially spaced radial ducts near the chimney. A chimney can also be formed of one or more chimney slots defined in at least a portion of the turns, where one or more chimney slots extend in a substantially slanted direction to a radial direction of the rotor. A transition region of the rotor can also include one or more diagonal flow channels, which discharge into one or more chimneys.

Abstract: A cooling gas ventilation chimney is provided for enhancing the heat transfer of an end region of a dynamoelectric machine. The dynamoelectric machine includes a rotor having a plurality of radial slots. A plurality of coils are seated in the radial slots, and the coils form a plurality of radially stacked turns. The ventilation chimney includes one or more chimney slots defined in at least a portion of the radially stacked turns. The chimney slots extend in a substantially radial direction to the rotor, and some of the chimney slots have an axial or circumferential length different from other chimney slots.

Abstract: A wind generator includes: a nacelle; a hub carried by the nacelle and including at least a pair of wind turbine blades; and an electricity producing generator including a stator and a rotor carried by the nacelle. The rotor is connected to the hub and rotatable in response to wind acting on the blades to rotate the rotor relative to the stator to generate electricity. A cooling system is carried by the nacelle and includes at least one ambient air inlet port opening through a surface of the nacelle downstream of the hub and blades, and a duct for flowing air from the inlet port in a generally upstream direction toward the hub and in cooling relation to the stator.

Abstract: A stator core assembly comprising adjacent packages of stacked lamination sheets that are separated by a plurality of radially extending spacer blocks, and each adjacent pair of spacer blocks define in cooperation with adjacent axially spaced laminations, a plurality of radial cooling ducts, each duct having a least one lamination surface having plurality of concavities.

Abstract: A rotating electrical machine with a reverse flow ventilation system is constructed with one or more discharge ducts at the center of the stator core to reduce the air gap pressure and promote more uniform cooling. In a second embodiment, discharge ducts are provided axially displaced from the center line of the core. In another embodiment, end region cooling of the conductor bars is enhanced by a series-parallel flow path constructed with the use of baffles and an apertured plate. In a final embodiment, both stator core center discharge ducts and series-parallel flow end region cooling are incorporated in the same machine.

Abstract: In a ventilated cooling system for a generator, the cooling ducts in the stator are arranged to control the flow of cooling gases through the stator. The ducts in the stator extend radially and direct cooling gases from the outer periphery of the stator to its inner cylindrical surface. Cooling gases flow radially inward through these stator ducts, extract heat out of the stator and exit from the stator ducts into an annular air gap between the stator and rotor. A fan on the rotor draws the heated air out from the air gap and causes more cooling gas to be drawn into the stator. The cooling ducts in the stator are spaced and sized to optimally distribute the flow of cooling gases through the stator by equalizing the pressure drops between the stator outer plenum and the entrance to the rotor exhaust fans. For example, the stator ducts may be spaced close together at the center of the stator and farther apart near the ends of the stator to provide balanced cooling flows and uniform temperatures.

Abstract: At least one liquid coolant passage is disposed within at least a pair of pole bodies in an electrical machine rotor. The liquid coolant passage is thermally coupled to pole loss heat caused by eddy currents and/or windage in the radially outermost portion of the rotor pole bodies. A rotatable liquid transfer coupling is fluid connected with the liquid passage(s) for transferring liquid coolant to and from the coolant passage(s) during machine operation. Preferably, a liquid coolant passage is included in each of N circumferentially spaced magnetically permeable pole bodies on the rotor. It is also preferable to include additional liquid coolant passages thermally coupled primarily to rotor windings within each coil slot of a typical rotor and fluid connected (either in parallel or in series) with the pole body liquid coolant passages.