The Ventilation and Cooling Structure of Auxiliary Slots of Generators in Series and Parallel with Variable Section

Abstract

An embodiment of the invention provides a series-parallel variable cross-section type generator sub-slot ventilation cooling structure. The structure includes: a sub-slot, rotor core, rotor winding, rotor wedge lower gasket bar, rotor slot wedge and series-parallel ventilation ditch. The auxiliary slot of rotor core yoke part of generator linear segment adopts variable cross-section form. The cross-sectional area of auxiliary slot near fan side is the largest, and the cross-sectional area decreases with the axial extension of rotor away from fan. The rotor winding, the rotor wedge lower gasketbar and the rotor slot wedge are provided with ventilation channels in the form of vertical series-parallel connection. The cooling air flows into the rotor winding from the auxiliary slot and flowsout from the vent on the rotor slot wedge to form a ventilation and cooling loop. The generator ventilation cooling structure of the invention can be used for solving the problem that the cooling effect of the rotor sub-slot ventilation structure is obviously weakened when the cooling air enters into the rotor core; The wind speed of the cooling air is ensured, and the temperature of the rotor winding is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of motor rotor cooling, in particular to a series-parallel variable cross-section ventilation cooling structure for auxiliary slots of generators. Background technique [0002] The ventilation and cooling method of the rotor of a large generator limits the design of the stator and rotor circuits and magnetic circuits of the generator. The temperature rise of the turbine generator rotor is directly related to the performance and economic indicators of the unit, and also affects the life of the generator and the reliability of operation. [0003] Turbogenerators often adopt a cooling method combining radial ventilation grooves and auxiliary groove ventilation grooves. However, because the axial extension of the rotor is far away from the fan, the wind speed is low and the air volume distribution is uneven, so it often cannot be well cooled. Cool the rotor winding of the generator far away from the fan; at the...

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Problems solved by technology

[0003] Turbogenerators often adopt a cooling method combining radial ventilation grooves and auxiliary groove ventilation grooves. However, because the axial extension of the rotor is far away from the fan, the wind speed is low and the air volume distribution is uneven, so it often cannot be well cooled. Cool the rotor winding of the generator far away from the fan; at the same time, the generator rotor radial ventilation groove and the cross section of the auxiliary groove are perpendicular to each other, and the large air duct resistance consumes wind energy. How to uniformly cool the generator rotor winding and reduce the air duct resistance band The loss of wind energy in the future has become the focus of research attention

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