Piezoelectric Generator d15 Mode Efficiency
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Solution Overview
Problem
Existing piezoelectric generators using d31 mode have low electric power generation efficiency due to the orthogonal direction of oscillation energy relative to the polarization and electrode orientation.
Innovation Solution
A piezoelectric generator design utilizing a support portion made of non-piezoelectric material, a piezoelectric body with perpendicular polarization, electrodes parallel to the polarization direction, and a weight on the opposite side, operating in d15 mode to enhance electric power generation efficiency by leveraging oscillation energy orthogonal to the polarization and parallel to the electrode direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If d31 mode oscillation is used with electrodes orthogonal to polarization direction, then the generator structure is simple, but electric power generation efficiency is low
Solution Approach 1:
The patent changes the oscillation mode parameter from d31 to d15 mode, which fundamentally alters the relationship between oscillation direction, polarization direction, and electrode orientation. This parameter change enables the oscillation direction to be orthogonal to polarization direction while electrodes are parallel to both oscillation and polarization directions, achieving high efficiency without structural complexity
Solution Approach 2:
The patent employs dynamic oscillation of the piezoelectric body in d15 mode, where the oscillation direction is controlled to be orthogonal to the polarization direction. This dynamic configuration allows the electrodes to be optimally oriented parallel to both oscillation and polarization directions, maximizing energy conversion efficiency while maintaining structural simplicity
2Productivity
If d15 mode oscillation is used with electrodes parallel to polarization direction, then electric power generation efficiency is high, but resonance frequency increases
Solution Approach 1:
The patent optimizes the thickness parameter of the piezoelectric body to adjust the resonance frequency while maintaining d15 mode operation. By carefully selecting the thickness, the system achieves high power generation efficiency without excessive resonance frequency, balancing performance requirements
Solution Approach 2:
The patent applies local quality optimization by configuring the electrode dimensions and positions specifically for d15 mode operation. The electrodes are made wider in the oscillation direction to capture more energy while the thickness and other dimensions are optimized to control resonance frequency, creating locally optimized regions with different functional priorities
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design improves electric power generation efficiency and reduces resonance frequency by increasing distortion and optimizing energy conversion in the d15 mode, leading to enhanced energy harvesting capabilities.
Implementation Method 1
a piezoelectric body disposed on the support portion and having the polarization direction perpendicular to the support portion; electrodes provided on the surfaces of the piezoelectric body opposed to each other and parallel with the polarization direction of the piezoelectric body
Data Source
AI summary
A generator that collects oscillation energy to convert to electric energy, the generator including a support portion made of non-piezoelectric material, a piezoelectric body disposed on the support portion and having a polarization direction perpendicular to a longitudinal direction of the support portion, the piezoelectric body being configured to oscillate in an oscillating direction to generate the oscillation energy, the oscillating direction perpendicular to the polarization direction, a first electrode provided on a first surface of the piezoelectric body parallel to the polarization direction, a second electrode provided on a second surface of the piezoelectric body parallel to the polarization direction, and a weight disposed on a third surface of the piezoelectric body facing the support portion.