Low-frequency magnetic field energy collector using piezoelectric combined pitchfork

Abstract

A low-frequency magnetic field energy collector using a piezoelectric combined pitchfork comprises the piezoelectric combined pitchfork, permanent magnets and a base (7), the piezoelectric combined pitchfork is composed of a first rectangular elastic metal fork arm (3), a first piezoelectric plate (5), a second rectangular elastic metal fork arm (4) and a second piezoelectric plate (6); the first piezoelectric plate is fixed to a transition end of the first rectangular elastic metal fork arm; the second piezoelectric plate is fixed to a transition end of the second rectangular elastic metal fork arm; the permanent magnets are symmetrically pasted to free ends of the two fork arms by gluing, the first permanent magnet (1) is mounted at an end of the first rectangular elastic metal fork arm (3), and the second permanent magnet (2) is mounted at an end of the second rectangular elastic metal fork arm (4); it is ensured that severe coupling is generated between the two fork arms to acquire maximum mechanical vibration. The piezoelectric combined fork is used as an energy collection and conversion unit, and it is possible to efficiently acquire weak low-frequency magnetic field energy.

Description

technical field [0001] The invention relates to a low-frequency magnetic field energy collector using a piezoelectric composite tuning fork, which belongs to the technical field of energy collection. Background technique [0002] Energy harvesting technology has become one of the important technical supports for the construction of the modern Internet of Things, effectively solving the problem of continuous and stable power supply of wireless sensor nodes in the Internet of Things. The current research on environmental energy collection mainly focuses on multiple energy sources: solar energy (such as public number CN105674587A discloses a reflective concentrating solar power station, public number CN105656410A discloses an adjustable water solar power generation system, etc.), wind energy (such as public No. CN105604798A discloses a coil type wind power generation equipment), mechanical energy (such as the publication number CN105634204A discloses a human foot mechanical ene...

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Problems solved by technology

These magnetic field energy harvesters based on the principle of ampere force or magnetic torque effect and using piezoelectric cantilever beams are still inefficient, because the mechanical quality factor of the piezoelectric cantilever beam structure is not high enough, resulting in losses during the magneto-mechanical-electrical conversion process. Not small

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