An off-resonance type wheel-type generator based on a cantilever beam piezoelectric vibrator

Abstract

The invention relates to an off-resonance type wheel-type generator based on a cantilever beam piezoelectric vibrator, and belongs to the field of piezoelectric power generating. A rotary disc slide sink cavity is communicated with a central hole on the other side and communicated with an annular cavity through a guide hole; a cantilever shaft sleeved in the center hole is connected with a side plate installed on a side of the sink cavity; the side plate is provided with an annular cavity and a guide hole; extrusion balls are filled in the guide holes of the rotary disc and the side plate; a cantilever of a metal substrate pressed by the end cap in the annular cavities of the rotary disc and the side plate and a bonded piezoelectric wafer constitute a piezoelectric vibrator; an excitation disc is filled in a slide formed the slide sink cavity and the cantilever shaft; balls are embedded in the inner rim and the outer rim of the excitation disc; and a lift inclined plane, a convex surface, return inclined surface and a concave surface on the two sides of the excitation disc form an excitation unit. The advantages and characteristics of the off-resonance type wheel-type generator are that no fixed support is needed and no electromagnetic interference exists; the piezoelectric oscillator structure is reasonable; off-resonance power generation is realized and the deformation of the radius is determined by a limit surface; stress points are the same and only bear compressive stress, so that the electric power generation is large; the reliability is high; an effective frequency band width is large; and the off-resonance type wheel-type generator is especially suitable for a low rotating speed environment.

Description

technical field [0001] The invention belongs to the technical field of new energy and power generation, and in particular relates to a non-resonant wheeled generator based on a cantilever beam piezoelectric vibrator, which is used for power supply of a wind generator blade monitoring system. Background technique [0002] Blades are the key components for wind turbines to receive wind energy and convert it into kinetic energy, which determines the reliability and service life of the generator. Wind turbine blades usually work in a harsh environment, and their own structural scale, weight and working load are very large. In addition to being damaged by irresistible natural disasters such as lightning strikes and earthquakes, natural corrosion, wear and fatigue stress, etc. Injuries are also inevitable. Practice has shown that one-third of the accidents that occur during the operation of wind turbines are caused by blade damage, so blade health monitoring is imperative. With ...

AI Technical Summary

Problems solved by technology

However, the power supply problem of the existing sensor monitoring system has not been well resolved, so it is difficult to popularize and apply it on a large scale, because the sensor monitoring system needs to be installed on the blade and rotate with the blade, and cannot provide electrical energy through the wire, and the battery is used The power supply needs to be shut down frequently to replace the battery, so a variety of piezoelectric generators have been proposed to power the monitoring system

The characteristic of most of the existing rotary piezoelectric generators is that the effective excitation of the piezoelectric vibrator must be achieved through the relative rotation between the "fixed parts" such as bearing seats or bearing caps and the "rotating body" of the shaft, which cannot be used for "unfixed parts". support” rotating body power generation requirements; in addition, due to the low speed of wind turbine blades, it is difficult to make the piezoelectric vibrator work in a resonance state, and the power generation capacity is weak

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