Gyromagnetic radial tension-compression excited piezoelectric generator

Abstract

The invention relates to a gyromagnetic radial tension-compression excited piezoelectric generator, and belongs to the technical field of piezoelectric power generation. An end cover is mounted at the end of a cylindrical wall of a shell, and limiting magnets are mounted on the end cover and the bottom wall of the shell; two groups of transducers are mounted on a cylindrical wall boss, the transducer is formed by sticking a substrate with piezoelectric plates, the two groups of transducers are symmetrically mounted and the substrates thereof contact each other; an excited magnet is mounted on one side of the piezoelectric plate at the free end of each transducer, the excited magnet is mounted opposite to the same magnetic pole of the adjacent limiting magnet, and the two groups of excited magnets are mounted with the same magnetic poles opposite; the left and right ends of a main shaft are respectively mounted on the end cover and the bottom wall of the shell via bearings, one end of the main shaft extends out via the bottom wall of the shell, exciting magnets I and I are uniformly embedded into the circumference of the main shaft and configured at intervals, and the exciting magnets I and I are arranged using the contact faces of the fixed ends of the two groups of transducers as axial symmetry centers; the exciting magnets I attract the excited magnets, and the exciting magnets II dispel the excited magnets.

Description

technical field [0001] The invention belongs to the technical field of new energy and power generation, and in particular relates to a piezoelectric generator with gyromagnetic radial tension and pressure excitation, which is used for power supply of a health monitoring system of a rotating body. Background technique [0002] In order to meet the power supply requirements of helicopter propellers, automobile tires, aeroengines, high-speed trains, oil and gas drills, gears and other rotating bodies or their bearing components health monitoring systems, scholars at home and abroad have proposed various forms of rotationally excited piezoelectric generators. The common feature is that a single transducer is used as an energy conversion device, the amount of deformation cannot be controlled, and the piezoelectric material is subjected to alternating tension-compression stress during operation. Since the deformation of the single transducer cannot be controlled, and the allowable...

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Problems solved by technology

[0002] In order to meet the power supply requirements of helicopter propellers, automobile tires, aeroengines, high-speed trains, oil and gas drills, gears and other rotating bodies or their bearing components health monitoring systems, scholars at home and abroad have proposed various forms of rotationally excited piezoelectric generators. The common feature is that the single transducer is used as the energy conversion device, the amount of deformation cannot be controlled, and the piezoelectric material is subjected to alternating tension-compression stress during work.

Since the deformation of the single transducer cannot be controlled, and the allowable tensile stress of the piezoelectric ceramic material is far lower than its allowable compressive stress, when the deformation of the transducer and the compressive stress of the piezoelectric material are large, the brittleness The piezoelectric material is fragile and the system reliability is low

In addition, the axial space of most products such as gearboxes and train wheelsets is limited, and it is impossible or inconvenient to install axial excitation mechanisms, or cannot meet the space requirements of transducers for axial vibration power generation

It can be seen that there are still big problems in the reliability and environmental adaptability of the existing rotary excitation piezoelectric power generation, which seriously hinders its popularization and application.

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