Variable speed constant frequency permanent magnetic speed-adjusting wind power generator

Abstract

The invention discloses a variable speed constant frequency permanent magnetic speed-adjusting wind power generator, comprising a wind wheel, a transmission shaft, a speed-up gear box, a generator and a frequency converter, and further comprising a permanent magnetic speed adjustor arranged on the transmission shaft between the speed-up gear box and the generator. The invention has the advantages that (1) the rotation speed output from the wind wheel or the gear box to the generator can be in stepless speed adjusting in a such way that the permanent magnetic speed adjustor adjusts air gaps, so that the rotation speed of the generator is relatively constant; (2) the soft start is realized, the generator can be switched in or switched out at any time under any rotation speed of a fan so as to increase the generating time of the wind power generator; (3) system vibration is eliminated so as to prolong the service life of a system apparatus and improve the reliability; (4) the invention is suitable for various bad working environments; (5) parts of the whole machine are reduced, and the fee of manufacture, use and maintenance is reduced; (6) blocking rotation and pulse are not needed to be afraid; (7) errors of centering can be tolerated; (8) the service life of the apparatus and the fault period are increased; (9) electromagnetic interference dose not exist; and (10) the total cost is reduced.

Description

technical field [0001] The invention relates to a wind power generator, in particular to a variable-speed constant-frequency permanent magnet speed-regulating wind power generator. Background technique [0002] Now, there are mainly two types of large and medium-sized wind turbines in the world. One is the fixed-pitch stall-adjusting type, which belongs to the constant-speed model. Generally, a synchronous motor or a squirrel-cage asynchronous motor is used as a generator, and the speed of the generator is kept at a constant value through a wind turbine controlled by a fixed-pitch stall. Then, after the wind turbine is connected to the grid, the rotation frequency of the stator magnetic field is equal to the grid frequency, the range of change of the rotor and impeller is small, and the efficiency of capturing wind energy is low. The other type is the variable-speed variable-pitch type, which generally uses double-fed motors or permanent magnet synchronous motors. The speed...

AI Technical Summary

Problems solved by technology

The two solutions have their own advantages and disadvantages: the former uses a high-speed motor, which is small in size and light in weight. The capacity of the double-fed inverter is only related to the slip capacity of the motor, which has high efficiency and low price. The disadvantage is that the speed-up gearbox is expensive and noisy. , easy to be damaged by fatigue; the latter has no gearbox and has high reliability, but uses a low-speed permanent magnet motor, which is large in size and high in cost, and the inverter needs full power, which increases the cost

[0004] To sum up, the comprehensive performance of the current variable speed and pitch wind turbines is not perfect yet.

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