Piezoelectric-electromagnetic coupling up-conversion multidirectional vibration energy harvesting device

Abstract

The invention discloses a piezoelectric-electromagnetic coupling up-conversion multidirectional vibration energy harvesting device. The harvesting device comprises a fixed base, a bearing, a rotatingmass block and at least one piezoelectric-electromagnetic coupling cantilever beam; the device is characterized in that at least one piezoelectric-electromagnetic coupling cantilever beam is arrangedon a shaft of the fixed base along the circumferential direction; the piezoelectric-electromagnetic coupling cantilever beam comprises a piezoelectric plate, a cantilever beam body, a coil and an on-beam permanent magnet. The piezoelectric plate is arranged on the surface of each cantilever beam body to collect energy; the on-beam permanent magnet is placed at the free end of the cantilever beam as a mass block; the coil for collecting energy is arranged on the fixed base below the axial direction of the on-beam permanent magnet; the bearing is installed on a center shaft of the fixed base, the rotating mass block is arranged on an outer ring of the bearing, at least one permanent magnet is arranged on the rotating mass block, the off-axis position corresponds to the on-beam permanent magnet, and the device can convert external low-frequency vibration into up-conversion resonance of the piezoelectric-electromagnetic coupling cantilever beam to collect energy.

Description

Technical field [0001] The invention belongs to the technical field of vibration energy capture, and specifically relates to a piezoelectric-electromagnetic coupling up-conversion multi-directional vibration energy capture device. Background technique [0002] With the widespread application of portable devices in real life, the power consumption of portable devices has become lower and lower. This makes it possible to use the energy in the environment to provide energy for portable devices. At present, the energy that can be used in the environment includes light energy, heat energy, vibration energy, etc., among which vibration energy is widely present in our living environment, such as the movement of the human body, the vibration of the vehicle, and so on. To this end, researchers have begun to study the technology of collecting vibration energy in the environment and converting it into electrical energy to provide electrical energy for portable devices. [0003] At present, ...

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Problems solved by technology

[0005] Purpose of the present invention: to propose a piezoelectric-electromagnetic coupling up-conversion multi-directional vibration energy harvesting device, improve the effective working frequency band of the energy harvester through piezoelectric-electromagnetic coupling resonance, and use up-conversion compound vibration to solve energy harvesting The problem of low energy harvesting efficiency of the device under the random swing of the human body

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