Transmission system of semi-direct-drive wind generator set

Abstract

The invention discloses a transmission system of a semi-direct-drive wind generator set. The transmission system of the semi-direct-drive wind generator set comprises a wind wheel system, a main shaft system, a gearbox, a generator and a coupler. The main shaft system comprises a main shaft, a transition flange and a main shaft double-bearing structure. The wind wheel system is connected to the shaft end of the main shaft. The gearbox and the generator are of an integrated structure and comprise the gearbox, the generator, a gearbox flange and a sun gear. The main shaft system is connected with the gearbox through the transition flange and the gearbox flange. The sun gear penetrates through a hollow drive shaft of the generator to be connected with the coupler located at the back end of the generator. An external wind load is transmitted to the generator through the wind wheel system, the main shaft system, the gearbox and the coupler. By the adoption of the transmission system of the semi-direct-drive wind generator set, the rigidity of the main shaft system and the reliability of the gearbox can be improved, the structure is compact, the weight is light and the reliability is high; and the transmission system is provided with the coupler, so that the problems that a gearbox does not have overload protection and is influenced by a shaft current are solved, and the centering error between the generator and the gearbox and the floating quantity of the sun gear of the gearbox are compensated for.

Description

technical field [0001] The invention relates to a transmission system structure of a semi-direct drive wind power generating set, which belongs to the technical field of wind power generation. Background technique [0002] Because the semi-direct drive unit has the advantages of both the direct drive unit and the doubly-fed unit, compared with the doubly-fed wind turbine, the medium-speed permanent magnet unit has no high-speed gear box high-speed fault and less maintenance than the doubly-fed wind turbine. And good power grid fault ride-through capability, from the consideration of the whole life cycle, it has a reduced cost of electricity. In the process of large-scale development of wind turbines, the technical development of semi-direct drive units has been favored. Although the cost per unit of electricity of the whole life cycle of the semi-direct drive unit within a certain power range has certain advantages, the production cost of the key components of the unit is r...

AI Technical Summary

Problems solved by technology

According to different structural forms or integrated design structures of main shaft bearings, gearboxes and generators, the transmission chain of the unit has various structural forms. The most typical structures are three: the first is split structure, which is the main shaft bearing, 1. The generators are integrated with each other, which is a traditional "three-point" structure or a double-bearing structure (split bearing housing). This transmission chain structure is simple, the design difficulty is low, and the maintenance is simple, but the size chain is long and the gearbox is loaded. Complex, the reliability of the gearbox is poor, and the weight and size of the nacelle are increased; the second type is a partially integrated mechanism, such as the integration of the main shaft bearing and the gearbox or the integrated design of the gearbox and the generator, the most typical one is the gearbox and the generator Integrated design, this structure has no coupling, the secondary sun gear of the gearbox directly outputs to drive the generator shaft, the structure is simple, but the gearbox has no overload protection and is easily affected by the shaft current, which will have a certain impact on the performance of the unit; The three are fully integrated structures, that is, the main shaft bearing, gearbox and generator are fully integrated. The transmission chain has a compact structure, and the weight and size of the nacelle are small, but it requires high design and manufacturing capabilities for components and can be maintained. Poor sex

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