Variable-ratio speed regulation device

Abstract

The invention provides a variable-ratio speed regulation device, belongs to the technical field of a mechanical gearbox and is applicable to an application of speed regulation of a wind driven generator. The variable-ratio speed regulation device comprises an input shaft connected with an output shaft of a step-up box, an output shaft connected with an input shaft of a generator, a sun wheel, a differential wheel, at least one planet wheel, a motor wheel and an outer framework, wherein the output shaft and the input shaft have the same axis center; the sun wheel is mounted on the output shaft; the differential wheel is provided with an inner gear ring and an outer gear ring, has the same axis center with the sun wheel, and is mounted on the input shaft; the planet wheels are uniformly distributed between the sun wheel and the differential wheel, and are respectively engaged with the sun wheel and the differential wheel; the motor wheel is connected with an output shaft of a differential motor, and is engaged with the outer gear ring of the differential wheel; the outer framework is connected with the input shaft and the output shaft through bearings, and is respectively connected with a shell of the motor wheel and the step-up box of a generation unit; the input shaft, the output shaft and the output shaft of the differential motor are provided with speed sensors; and the differential motor and the speed sensors are respectively connected with a controller of the generation unit. With the adoption of the variable-ratio speed regulation device provided by the invention, the rotating speed of the output shaft meets the requirement on a rotating speed of the generator.

Description

technical field [0001] The invention belongs to the technical field of mechanical gear boxes, in particular to a speed regulating device with variable speed ratio. Background technique [0002] As a clean energy source, wind turbines have been widely used at present. At present, there are three main types of large-scale commercial wind turbines: doubly-fed variable-speed constant-frequency wind turbines, semi-direct-drive variable-speed constant-frequency generators and direct-drive variable-speed constant-frequency generators. . In these applications, due to the instability of the wind speed, the rotation speed of the wind rotor composed of the blades and the hub is unstable. This makes the output frequency of the generator unstable, and the generator cannot be directly connected to the grid. In order to solve this problem, converter devices are used to decouple the frequency of the generator from the frequency of the power grid, so that the variable-speed fan can deliver...

AI Technical Summary

Problems solved by technology

[0003]The several technical solutions mentioned above all use converter devices without exception, which has harmonic interference to the power grid and poor ride-through ability under low voltage conditions and other shortcomings

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