Electric direct drive wind power pitch drive system

Abstract

The invention discloses a wind power variable pitch drive system, and particularly relates to an electric direct-driven wind power variable pitch drive system which is high in reliability, low in cost, high in efficiency and little in occupied space. The system comprises a hub, a variable pitch bearing outer ring and a variable pitch bearing inner ring, wherein the variable pitch bearing outer ring is arranged on the hub, and the variable pitch bearing inner ring is matched with the variable pitch bearing outer ring in a rotating mode. The system further comprises a linear drive mechanism which is rotatably installed on the circumferential edge of the variable pitch bearing inner ring, and one end of the linear drive mechanism is provided with a joint bearing which is hinged to the hub. Linear motions provided by the linear drive mechanism are directly transferred into rotation of the variable pitch bearing inner ring, a complex transmission structure is avoided, and accordingly the occupied space of the whole mechanism is substantially reduced, the whole mechanism is completely in the hub, holes do not need to be formed in the hub, rigidity of the hub is improved, and the system has the advantages of being low in weight, simple in structure, high in reliability, long in service life and the like.

Description

technical field [0001] The invention relates to a wind power drive system, in particular to an electric direct drive wind power pitch drive system. Background technique [0002] Wind turbines above the megawatt level that have entered commercial operation around the world have adopted variable pitch technology. The combination of pitch control and frequency conversion technology has improved the power generation efficiency and power quality of wind turbines, enabling wind turbines It can obtain the best performance under all conditions and reduce the impact of wind force on the wind turbine. Together with the frequency conversion control, it constitutes the core technology of the megawatt-level variable-speed constant-frequency wind turbine. With the continuous maturity and development of the wind power industry technology, variable The superiority of pitch wind turbines is becoming more and more prominent, the reliability of wind turbine operation has been greatly improved,...

AI Technical Summary

Problems solved by technology

The disadvantage is that the service life of the synchronous belt is greatly affected by the operating environment of the mechanism. Once the rubber ages, the synchronous belt will be deformed, elongated and cracked.

Due to the heavy load on the synchronous belt, it is easy to elongate in the later maintenance, and the number of times the pitch drive system will be tensioned during the maintenance process will be more frequent

It is difficult to replace the timing belt when it reaches the end of its service life

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