Rotary self-frequency-modulation piezoelectric vibration energy collector

Abstract

The invention relates to a rotary self-frequency-modulation piezoelectric vibration energy collector, which comprises a main beam, an auxiliary beam, a mass block and an outer frame. The main beam isa piezoelectric beam, and is composed of a piezoelectric layer and a substrate layer. One end of the main beam is fixed to the outer frame, and the other end of the main beam is connected with the mass block. The auxiliary beam is an elastic beam; one end of the auxiliary beam is connected with the outer frame, and the other end of the auxiliary beam is connected with the mass block; a penetratinggroove is formed in the middle of the mass block; the mass block is connected with the main beam through the penetrating groove; the mass block is limited by the penetrating groove to slide in the length direction of the main beam; and the outer frame is fixed to a rotating mechanism. When centrifugal force borne by the mass block acts on the mass block, the position of the mass center of the mass block on the main beam is changed; and the inherent frequency of the vibration energy collector is adjusted to be matched with the rotation excitation frequency, so that the working frequency band width of the vibration energy collector is increased, the structural reliability is improved, and the structural design difficulty is reduced.

Description

technical field [0001] The invention relates to the technical field of energy collection, in particular to a rotary self-frequency-regulating vibration energy harvester. Background technique [0002] The rapid development and wide application of microelectronic devices and systems (such as wireless sensor network nodes, medical implant sensors, weapon equipment fault monitoring systems, etc.) require the power supply system to have the characteristics of long life, small size, and light weight. Traditional chemical energy batteries have encountered technical bottlenecks such as short life, large volume, and heavy weight during the development process, which has become one of the main obstacles restricting the development of microelectronic devices and systems. Energy harvesting that converts vibration energy in the surrounding environment into electrical energy In theory, battery technology can achieve infinitely long power supply time, and has the advantages of small size, ...

AI Technical Summary

Problems solved by technology

However, this structure introduces roller bearings, which increases the complexity of the structure; at the same time, the trapezoidal beam in this structure moves back and forth in the roller bearings with the change of vehicle speed, which is easy to damage the piezoelectric material or the electrodes on the surface of the piezoelectric material, reducing the Device reliability is low

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