Electrostatic Suspension Vibration Power Generator
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Solution Overview
Problem
Conventional vibration power generators face challenges in reducing resonance frequency without compromising mechanical reliability and complexity, particularly due to limitations in silicon or glass substrates and resin springs, which lead to inefficient frequency reduction and structural complications.
Innovation Solution
A vibration power generator design featuring substrates with electrostatic force retention, utilizing films with the same polarity to maintain position and allow vibration in desired directions without mechanical springs, and a rectifier circuit for voltage conversion to stabilize output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the mass of the first substrate is increased to reduce resonance frequency, then the resonance frequency is reduced, but a large force is applied to the springs causing deterioration of durability
Solution Approach 1:
The patent replaces the mechanical spring system with an electrostatic field-based suspension system. The first substrate is suspended using electrostatic attraction between electrodes without mechanical contact, eliminating mechanical springs entirely. This substitution allows the substrate to be held in position and return to home position through electrostatic forces rather than mechanical elasticity, solving the durability problem while enabling low-frequency operation.
Solution Approach 2:
The patent changes the fundamental operating parameters by using electrostatic field strength and voltage control instead of mechanical spring constants. By adjusting electrostatic field parameters (voltage, electrode configuration), the system can achieve the desired resonance frequency reduction without being constrained by mechanical material properties, thereby improving both frequency control and reliability.
2Speed
If the spring constant of the springs is decreased to reduce resonance frequency, then the resonance frequency is reduced, but it is difficult to decrease the spring constant due to elastic constant of material and size of spring
Solution Approach 1:
The patent eliminates mechanical springs and their associated manufacturing constraints by substituting them with an electrostatic suspension system. The spring constant, which is inherently difficult to adjust due to material elastic constants and geometric constraints, is replaced by electrostatic field parameters that can be more easily controlled through voltage and electrode design.
Solution Approach 2:
The patent transitions from mechanical parameters (spring constant determined by material elastic constant and geometry) to electrostatic parameters (field strength determined by voltage and electrode configuration). This parameter change enables more flexible and easier adjustment of the effective spring constant to achieve desired resonance frequencies.
3Reliability
If resin springs are used to reduce resonance frequency and improve elastic strain resistance, then the resonance frequency is reduced and durability is improved, but the structure becomes more complicated
Solution Approach 1:
The patent replaces the complex mechanical spring structure (including resin springs with specific geometric configurations) with a simpler electrostatic field-based suspension system. The electrostatic field provides the necessary restoring force without requiring complex mechanical structures, thereby reducing device complexity while maintaining or improving reliability.
4Productivity
If the first substrate is made to vibrate at low frequency with large amplitude, then electrical generation efficiency is improved, but mechanical reliability of conventional spring structures deteriorates
Solution Approach 1:
The patent enables low-frequency, large-amplitude vibration for improved electrical generation efficiency by replacing mechanical springs with an electrostatic suspension system. The electrostatic field can accommodate large displacements and low-frequency oscillations without the mechanical fatigue and durability issues that plague conventional spring structures, thereby simultaneously improving productivity and reliability.
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
Enables efficient electrical generation at low frequencies with improved mechanical reliability and reduced structural complexity, allowing for stable output voltage and decreased maintenance needs.
Implementation Method 1
a static induction vibration power generating device in which electric charges are provided to one electrode of a variable capacitance, and charges are induced to an opposed electrode by a static induction
Implementation Method 2
The vibration power generator 10 is composed of a first substrate 11 provided with a plurality of conductive surface regions 13, and a second substrate 16 provided with a plurality of electret material regions 15
Implementation Method 3
The springs 19 are connected to both side surfaces of the first substrate 11, and also connected to the fixation structure 17. The first substrate 11 is capable of returning to its home position due to the springs 19
Implementation Method 4
there is proposed an electrostatic induction vibration power generator using resin springs that is excellent in resistance to elastic strain and enables reduction of a resonance frequency
Data Source
AI summary
A vibration power generator includes a first substrate, a first electrode on the first substrate, a second substrate spaced from and opposite the first substrate, and a second electrode on the second substrate. The first electrode vibrates with respect to the second substrate, and the first electrode and the second electrode include a film retaining electric charges. The vibration generator includes a third electrode with a film retaining electric charges on the first substrate, and a fourth electrode with a film retaining electric charges on the second substrate. The third electrode and the fourth electrode are arranged so that the first substrate is retained in a predetermined position when an external force does not act on the first substrate, while an electrostatic force for returning the first substrate to a predetermined position acts on the first substrate and the first substrate moves with respect to the second substrate.