Self-circulating heat dissipating device of 5MW doubly-fed air-cooled and water-cooled wind generator

Abstract

The invention relates to a self-circulating heat dissipating device of a 5MW doubly-fed air-cooled and water-cooled wind generator. The self-circulating heat dissipating device has a specific structure which is characterized in that a stator core and a rotor core respectively adopt a segmented structure, radial ventilation ducts are formed between every two iron core sections by using ventilation duct plates in the lamination process of the rotor core, and the rotor core is segmented into sections with length which is gradually shortened from the two ends to the middle part to enable the rotor core to form a non-equidistant ventilation duct structure which is symmetric by the middle part of the core; axial-flow fans which are used for supplying air to the middle part of the rotor core are respectively arranged on a motor rotating shaft outside the two ends of the rotor core, and high air pressure from the outside to the inside is formed at the two ends of the rotor core when the motor rotating shaft rotates, so as to supply cold air to the internal central part of the rotor core through an axial ventilation duct of the rotor. The self-circulating heat dissipating device of the 5MW doubly-fed air-cooled and water-cooled wind generator has the advantages that the internal temperature of the generator is reduced, the insulating reliability of the motor is improved and the service life of the generator is prolonged.

Description

technical field [0001] The invention relates to a self-circulating ventilation and heat dissipation device, in particular to a self-circulation heat dissipation device for a 5MW double-fed air-water-cooled wind power generator. Background technique [0002] As an energy conversion mechanism, the generator will inevitably produce energy loss during the energy conversion process. Most of the lost energy will eventually turn into heat, which will increase the temperature of the various components of the motor. Especially the megawatt-class doubly-fed wind turbine, its working principle is different from ordinary low-voltage high-power wound motors. When working at full load, its stator and rotor simultaneously feed power to the grid. At this time, due to the low-frequency excitation of the rotor The current and rotor loss will be much larger than that of ordinary wound motors, so the total calorific value of stator and rotor will be much higher than that of ordinary wound motor...

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Problems solved by technology

[0003] Due to its special working environment and installation space, the volume and weight of 5MW double-fed wind turbines are strictly limited, so it is necessary to reduce the frame size as much as possible while satisfying the output capacity, which makes the power density of the motor quite high, and its iron The length-to-diameter ratio of the core is much larger than that of the ordinary rotor wound motor. Although the air-water cooling method is adopted, the traditional self-circulating ventilation and heat dissipation structure cannot effectively send the cooling air into the central part of the iron core, and cannot meet its heat dissipation requirements, resulting in motor The central part of the iron core is partially overheated, and a huge amount of heat is accumulated inside the motor, causing the generator to overheat and cause insulation failure

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