Vibration Power Generation Research Articles

Research on Performance Improvement of Magnetostrictive Vibration Power Generator by Frame Material

Research on Performance Improvement of Magnetostrictive Vibration Power Generator by Frame Material

The Developpment of the Cantilever Typed Vibration Power Generation Floor

The purpose of out study is to establish the way for making vibration power generation floor. In the consideration of our study is composed of three processes. The first is to establish the design method obtaining the desirable maximum power from cantilever piezoelectric vibration unit. The 2nd is to construct the vibrating floor. The 3rd is to estimate the charging efficiency using the capacitor. After all we examine the average output power by the vibration power generation floor. The applications of the vibration power generation floor are assumed as power source of sensor network nodes and foot light at night and so on. Considering for the use of power supplier for sensor network node, the desirable generated power has been estimated more than 100uW averagely. That is our target. We have performed above three processes and succeeded in making the cantilever typed vibration power generating floor which can generate 120uW averagely.

Magnetostrictive low-cost high-performance vibration power generator

A high-sensitivity, high-durability, low-cost vibration power-generating device using a magnetostrictive element (Fe-Ga alloy) is proposed. The device comprises a unimorph layer having a magnetostrictive element attached to a U-shaped frame with a permanent magnet for magnetic bias wound about by a coil. By magnetically saturating the part to which the frame element is affixed, an electromotive force is generated in the coil by vibration according to the change in the magnetic flux generated by the inverse magnetostrictive effect of the element. An evaluation of a prototype device (4 g) using an element of 4 × 0.5 × 16 mm is performed. With a weight of 1.7 g attached, an open-circuit voltage of 4 V at an oscillation of 88.7 Hz and 6 m/s2 yields the effective power of 2.0 mW. With a weight of 10.2 g, an effective power of 0.39 mW is generated at a frequency of 28.4 Hz and an acceleration of 0.075 G. After repeated oscillation at 420 Hz and 8 G for 100 million times, the resonant frequency and voltage remain unchanged.

Driving conditions of accelerometer by vibration power generation using parallel-type laminated piezoelectric elements

Driving conditions of accelerometer by vibration power generation using parallel-type laminated piezoelectric elements

Monitoring System for Railway Steel Bridge by Vibration Power Generation

Monitoring System for Railway Steel Bridge by Vibration Power Generation

Continuous driving of accelerometer by vibration power generation using parallel-type laminated piezoelectric elements

Continuous driving of accelerometer by vibration power generation using parallel-type laminated piezoelectric elements

Toward a New Epoch in Which the Anything can be Electric Sources Cause of Harvesting Small Kinetic Energy: Various Vibration Power Generation Technology and Development of Research in the Field

Toward a New Epoch in Which the Anything can be Electric Sources Cause of Harvesting Small Kinetic Energy: Various Vibration Power Generation Technology and Development of Research in the Field

Development of high-precision electret for vibration power generation

Development of high-precision electret for vibration power generation

Output power maximization using extremum seeking control for a vibration power generation system in multiple frequency vibration

Output power maximization using extremum seeking control for a vibration power generation system in multiple frequency vibration

Performance improvement of magnetostrictive-type vibrational power generator using an optimization technique

Performance improvement of magnetostrictive-type vibrational power generator using an optimization technique

Proposal of Mass-Production Structure of Magnetostrictive Vibrational Power Generator for Battery-Free IoT

Author proposes mass production structure of magnetostrictive vibrational power generator for battery- free IoT. This is based on a lamination of Fe-Ga alloy and a magnetic material (part), with a coil wound. This lamination is formed as a part of a U-shaped frame yoke with a permanent magnet attached. The magnetic part has moderate rigidity and is in a state of magnetic saturation. When the lamination is bent by an external force, the uniform stress generated in Fe-Ga changes the magnetic flux due to the Inverse magnetostrictive effect, and electromotive force proportional to time differential of the interlinking magnetic flux is generated in the coil. Compared with our conventional parallel beam type, the number of turns of the coil can be increased more than twice, and the assembly is easy and durability is high. The prototype using a Fe-Ga plate of 4 x 0.5 x 16mm3 generated maximum power of 1 mW at 28.4 Hz and 0.075 G vibration, and succeeded wireless signal transmission with one free vibration.

Development of a Cantilever-Type Electrostatic Energy Harvester and Its Charging Characteristics on a Highway Viaduct.

We have developed a micro-electro-mechanical systems (MEMS) electrostatic vibratory power generator with over 100 W of (root-mean-square) output electric power under 0.03 G (G: the acceleration of gravity) accelerations. The device is made of a silicon-on-insulator (SOI) wafer and is fabricated by silicon micromachining technology. An electret built-in potential is given to the device by electrothermal polarization in silicon oxide using potassium ions. The force factor, which is defined by a proportional coefficient of the output current with respect to the vibration velocity, is 2.34 × 10 C/m; this large value allows the developed vibration power generator to have a very high power efficiency of 80.7%. We have also demonstrated a charging experiment by using an environmental acceleration waveform with an average amplitude of about 0.03 G taken at a viaduct of a highway, and we obtained 4.8 mJ of electric energy stored in a 44 F capacitor in 90 min.

Rectification Methods to Increase Harvested Energy in Vibration Generation Using Piezoelectric Elements

SUMMARYWe studied vibration power generation using piezoelectric elements in order to determine effective rectification methods to increase harvested energy from vibration power generation systems. First, we experimentally clarified the output characteristics of two kinds of passive rectification methods for vibration power generation systems. Then, an appropriate rectification method for various kinds of loads was studied. In order to increase the harvested power from an integrated vibration power generation system with multiple piezoelectric elements, we considered an appropriate circuit structure for connecting multiple piezoelectric elements. The effectiveness was verified experimentally.

Power performance evaluation of vibration power generator using the magnetic flux concentration effect

Power performance evaluation of vibration power generator using the magnetic flux concentration effect

Driving tests of acceleration monitoring system due to vibration power generation using the vibration of air compressor

Driving tests of acceleration monitoring system due to vibration power generation using the vibration of air compressor

Performance improvement of 2-DOF magnetostrictive vibrational power generator

Performance improvement of 2-DOF magnetostrictive vibrational power generator

Development of Steel Bridge Clattering-detecting Device Utilizing Vibration-powered Generator

When a bridge loses support from one pier due to causes such as shoe subsidence, this imbalance causes repercussions known as “clattering”. Clattering is so harmful that it may cause not only damages to shoes but also rapid extension of cracks in peripheral structures, and greatly affects total soundness of beams. However, it is difficult to pinpoint the occurrence and progress of clattering by inspections at fixed interval (every two years). In this paper, we introduce a development of clattering-detecting device utilizing vibration-powered generator as a new monitoring system to complement inspections.

Electrostatic Energy Harvesting Circuit with DC-DC Convertor for Vibration Power Generation System

This paper presents an interface circuit with power control features for electrostatic vibration energy harvesting. A DC-DC convertor is used to control the output voltage of a diode-based charge pump circuit. Therefore, the maximum and minimum voltage across the variable capacitor of the energy harvester may be adjusted to track the maximum power point of the system. The power conversion function of the DC-DC convertor depends on the switches configuration. An example of Maximum Power Point Tracking (MPPT) for different conversion function is presented in this paper. Simulation results show that at least 10 μW is generated.

OS0804 発電効率を向上させる多自由度振動発電機の設計手法

The vibration power generator is strongly desired to provide distributed local power supply. But the problem is small power at off resonance frequency. Therefore multiple degree of freedom vibration power generator is designed to improve generation efficiency for wider frequency range.

エアコンプレッサの振動を利用した振動発電による温度モニタリングシステムの駆動試験

エアコンプレッサの振動を利用した振動発電による温度モニタリングシステムの駆動試験