A wind turbine mechanical electromagnetic composite main drive system

Abstract

The invention discloses a wind turbine mechanical and electromagnetic composite main transmission system. An input transmission shaft is provided with a low-speed shaft permanent magnet generator rotor and a low-speed shaft permanent magnet generator stator. Planetary gears are arranged on the edge of a planetary gear frame. A sun gear is arranged between the planetary gears and further provided with an output transmission shaft. Outer gear rings are arranged at the outer portions of the planetary gears. A magnetic field modulation magnetic gear motor inner rotor is fixed to the outer gear ring. Compared with the prior art, the characteristics of a planetary gear train are sufficiently utilized, the inner gear ring, the outer gear ring and the magnetic field modulation magnetic gear are combined, and the transmission system achieves constant-rotation-speed output in the variable rotation speed input environment through adjustment of the magnetic gear magnetic field. The type of transmission system can achieve stepless speed changing, and particularly, due to the character that a wind turbine needs to achieve stable energy output through conversion of instable wind energy, the transmission system has good conversion application prospects in the wind energy development effect.

Description

technical field [0001] The invention relates to a transmission system, in particular to a mechanical and electromagnetic composite main transmission system of a wind turbine, which belongs to the field of wind power generation. Background technique [0002] At present, the mainstream wind turbines in the market are mainly permanent magnet direct drive wind turbines and doubly-fed variable-speed wind turbines. The speed ratio of their main drive system is constant. The speed ratio of the type wind turbine is about 1:100, which makes the rotor speed of the generator connected to the output shaft of the wind turbine transmission system fluctuate with the fluctuation of wind speed, and the output of stable frequency electric energy mainly depends on the power electronic equipment. Relevant data show that the components with the highest annual failure frequency of wind turbines are concentrated on the relevant power electronic equipment and control equipment. In addition, the dou...

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Problems solved by technology

Relevant data show that the components with the highest annual failure frequency of wind turbines are concentrated on the relevant power electronic equipment and control equipment. In addition, the double-fed unit has the longest downtime due to gearbox failure, which affects the stable operation and profitability of the entire wind farm.

[0003] In addition, the permanent magnet direct drive wind turbine generator is bulky, the amount of copper used in the motor part is high, and the cost of rare earth permanent magnet materials is high, resulting in a relatively high cost of the whole machine, especially for the development and production of wind turbines. The part of the large-scale permanent magnet direct-drive wind turbine generator will also become very heavy, and technology and cost will face great challenges

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