Ventilating heat-radiation structure of direct-drive permanent-magnet wind-driven generator

Abstract

The invention discloses a ventilating heat-radiation structure of a direct-drive permanent-magnet wind-driven generator. The ventilating heat-radiation structure comprises a casing and an external industrial air conditioner, wherein ventilating gaps communicated with each other are formed by enclosure of a main shaft, a rotor, a stator, a front end cover and a rear end cover in the casing, and heat-radiating ribs are arranged on the casing. A blast pipe of the industrial air conditioner is communicated with the ventilating gaps, the stator is provided with radial air vents, baffles are arranged among the heat-radiating ribs, the end part of the casing is provided with an annular hot blast collecting channel, the circulating air ducts communicated with the radial air vents are formed among the heat-radiating ribs and the baffles through enclosure, the circulating air ducts are communicated with the hot blast collecting channel, and a suction pipe of the industrial air conditioner is communicated with the hot blast collecting channel. The ventilating heat-radiation structure has the beneficial effects that the heat-radiation efficiency is greatly improved, the difficulty in transportation and installation of large direct-drive generators is solved, and the cost of the generator is reduced to a large extent at the same time.

Description

technical field [0001] The invention relates to a ventilation and heat dissipation structure of a direct-drive permanent magnet wind-driven generator, which belongs to the technical field of direct-drive permanent magnet generators in wind power generation equipment. Background technique [0002] Heat dissipation is a very important factor that needs to be considered in wind turbines. Known direct-drive permanent magnet wind generators generally adopt natural wind cooling. Although the direct-drive permanent magnet generator has two structural forms, the inner rotor structure and the outer rotor structure, the natural wind cooling method is adopted for ventilation and cooling. Natural wind cooling itself is inefficient, and wind turbines are supported by towers, so the tower effect has an impact on the natural ventilation and heat dissipation of generators. Therefore, the general natural ventilation and heat dissipation are not balanced, which will increase the local tempe...

AI Technical Summary

Problems solved by technology

Ordinary natural air cooling can ensure the heat dissipation requirements of the wind turbine working normally below the rated power most of the time, but it cannot meet the heat dissipation requirements of the wind turbine under full load operation

[0004] Especially for direct-drive permanent magnet wind turbines, due to the low heat dissipation efficiency, the direct-drive permanent magnet generator will have a large structural volume and low power density, resulting in a low utilization rate of effective materials for the generator, directly increasing the unit kW of the generator. cost

Moreover, due to the inability to make breakthroughs in heat dissipation technology, the outer diameter of direct-drive wind turbines with a power of more than 3 megawatts has exceeded 5.2 meters, which brings great difficulties to transportation and assembly.

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