Composite vibration energy collector with conical cavity beam

Abstract

The invention discloses a composite vibration energy collector with a conical cavity beam. The composite vibration energy collector comprises an outer frame, an electromagnetic energy collecting unitand a composite beam. The electromagnetic energy collection unit comprises a coil and a magnet vibrator. The composite beam comprises a sub-cantilever beam, a conical cavity beam, a connecting piece,a conical cavity piezoelectric patch and a sub-cantilever beam piezoelectric patch. The short end of the conical cavity beam is fixed on the outer frame, the long end of the conical cavity beam is connected with one end of the sub-cantilever beam through a connecting piece, the other end of the sub-cantilever beam is fixedly provided with the magnet vibrator, the conical cavity beam is provided with the conical cavity piezoelectric patch, the sub-cantilever beam is provided with the sub-cantilever beam piezoelectric patch, and the coil is concentric with the magnet vibrator and is arranged onthe outer frame. The two beams which are different in resonant frequency but close to each other are coupled through the connecting piece, the bandwidth is increased, the output of piezoelectric voltage is improved through the design of the conical cavity beam, meanwhile, the magnet vibrator is used for being matched with the inherent frequency of a target system, and the collection efficiency isimproved.

Description

technical field [0001] The invention relates to a conical cavity-beam composite vibration energy collector, which belongs to the technical field of piezoelectric electromagnetic composite energy collection. Background technique [0002] The traditional power supply method is mainly chemical batteries. This power supply method has the following outstanding problems: First, compared with electronic equipment, the battery power supply life is limited, and it is necessary to replace or recharge the battery periodically. Secondly, for equipment in some special environments, such as uninhabited areas and closed environments, the cost of battery replacement is too high or difficult to replace. Finally, waste batteries cause serious environmental pollution, and there are also huge challenges in the recycling of old batteries. [0003] In recent years, with the development of miniature electronic devices, the emergence of low-power consumption chips and sensors has made it possible ...

AI Technical Summary

Problems solved by technology

[0002] The traditional power supply method is mainly chemical batteries. This power supply method has the following outstanding problems: First, compared with electronic equipment, the battery power supply life is limited, and it is necessary to replace or recharge the battery periodically.

Piezoelectric transduction has the advantages of simple structure, high output voltage and power density, but there are disadvantages such as large piezoelectric internal resistance and low output current, and piezoelectric materials are prone to fracture and shattering.

Electromagnetic transduction has the advantages of large output current and low internal resistance, but has the disadvantage of low output voltage

Compared with the first two transducers, electrostatic transduction requires an additional power source or charge source, so passive power supply cannot be achieved

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