A swirl excitation piezoelectric energy harvester for wind power gearbox monitoring

Abstract

The invention relates to a vortex-excitation piezoelectric energy harvester for monitoring a wind power gear box, and belongs to the field of piezoelectric power generation. A main shaft is sequentially sleeved with a left wall plate, a left shaft sleeve, a rim, a right shaft sleeve and a right wall plate from left to right; a baffle plate is arranged at the end part; the left side of an inner ring of a bearing on the left wall plate abuts on a shaft shoulder; the right side of the inner ring of the bearing on the right wall plate abuts on the baffle plate; a certain included angle exists between a blade and a bus of the rim; two ends of the shell are connected with the left wall plate and the right wall plate respectively; a balancing weight is arranged on the outer wall of the shell; a limiting frame and a piezoelectric vibrator are arranged at the left end and the right end of the shell; the length and the width of a piezoelectric wafer are smaller than those of a hollow cavity of the limiting frame respectively; and the length and the width of a metal substrate are greater than those of the hollow cavity of the limiting frame respectively. The vortex-excitation piezoelectric energy harvester has the advantages and characteristics that the piezoelectric vibrator is excited by fluid motion caused by rotation to generate electricity; rigid shock and electromagnetic interference are avoided; the piezoelectric wafer only bears pressure stress with a controllable range; the reliability is high; fixed support is not needed; and the vortex-excitation piezoelectric energy harvester can be applied to cantilever gear shaft and multi-gear coaxial occasions.

Description

technical field [0001] The invention belongs to the technical field of gear monitoring and piezoelectric power generation, and in particular relates to a swirl excitation piezoelectric energy harvester for wind power gearbox monitoring. Background technique [0002] The gearbox is a key component of a wind turbine, and its function is to transmit power. When the wind turbine is running normally, the speed of the wind rotor is low, resulting in low efficiency of the generator. Therefore, it is necessary to increase the power generation capacity and efficiency through the gearbox. Because the wind power gearbox works in a variable speed and variable load environment, it is prone to failure; in addition, when the wind power gearbox fails, it is difficult to repair and the cost is high. The operation and maintenance cost of the wind power gearbox can be as high as 30% of the overall operating cost. Therefore, various forms of real-time monitoring systems and methods for gearbox...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the power supply problem faced by the gear monitoring system in the existing wind power gearbox, the present invention proposes a swirl excitation piezoelectric energy harvester for wind power gearbox monitoring

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