Molly Ayala
Vibration energy harvesting is a process that converts kinetic energy from vibrations into electrical energy. This process is used to power wireless equipment and sensors. Vibration-powered generators consist of a resonator that amplifies the vibration source and a transducer mechanism that converts the energy from the vibrations into electrical energy. The transducer usually consists of a magnet and coil or a piezoelectric crystal. While the concept of vibration energy harvesting is simple, there are limitations to the current technology. For example, the magnetic vibration energy harvester developed at the University of Southampton is approximately one cubic centimeter in size, which is too large for modern electronic devices. However, future improvements in size could make vibration energy harvesting an ideal power source for medically implanted devices.
| Characteristics | Values |
|---|---|
| Type of generator | Vibration-powered generator |
| Type of energy | Converts kinetic energy from vibration into electrical energy |
| Source of vibration | Sound pressure waves or other ambient vibrations |
| Components | Resonator, transducer mechanism |
| Transducer mechanism | Magnet and coil or piezoelectric crystal |
| Use of piezoelectric crystal | Emits an electric current when compressed or changes shape with an electric charge |
| Use case | Powering wireless equipment, sensors, monitoring systems, microelectronic devices, pacemakers |
| Limitations | Size of the generator |
| Benefits | Does not run out, long service life, lightweight, compact, simple to install |
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What You'll Learn
Vibration-powered generators
One example of a vibration-powered generator is the one developed by a team from the University of Southampton in 2007. This miniature electromagnetic vibration energy generator consists of a cantilever beam with a magnet attached to the end. When the device is subjected to vibrations, the beam moves up and down, causing the magnet to move in and out of the coil, creating a change in magnetic flux and generating an electric current through electromagnetic induction. This type of generator is ideal for powering sensors in hard-to-reach locations as it eliminates the need for electrical wires or batteries.
Another example is the vibration-powered generator developed by a group at Northwestern University in 2012. This generator is made of polymer in the form of a spring. When the spring vibrates, the attached magnet reciprocates in the coil, creating a change in magnetic flux and generating electricity.
Piezoelectric-based generators are another type of vibration-powered generator. These generators use thin membranes or cantilever beams made of piezoelectric crystals as the transducer mechanism. When the crystal is subjected to the kinetic energy of the vibration, it produces a small amount of current due to the piezoelectric effect. These generators are typically simple in design, with few moving parts, and have a long service life, making them a popular choice for energy harvesting from vibrations.
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Piezoelectric crystals
The piezoelectric effect is particularly useful in applications where precise positioning and control are required, such as in actuators and servo mechanisms. Additionally, piezoelectric crystals are commonly used in tactile sensors, where the force exerted on the crystal generates an electrical signal that can be interpreted by a microcontroller, allowing for the detection of physical contact. This technology is especially valuable in robotics, where it enables a robotic arm to sense when it has grasped an object. Piezoelectric crystals are also employed in automotive engine management systems to detect engine knock or detonation at certain hertz frequencies.
Furthermore, piezoelectric crystals can be utilized in energy harvesting, particularly in the development of vibration-powered generators. These generators use thin membranes or cantilever beams made of piezoelectric crystals as a transducer mechanism to convert vibrational energy into electrical energy. One innovative approach involves using water droplets at the end of a piezoelectric cantilever beam. The kinetic energy of the vibrations excites the water droplets, causing them to oscillate and resulting in the deflection of the beam. This deflection, or strain, is then converted into electrical energy through the piezoelectric effect. This method offers the advantage of being adaptable to a broad range of excitation frequencies.
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Electromagnetic induction
Vibration-powered generators are a type of electric generator that converts kinetic energy from vibration into electrical energy. These generators usually consist of a resonator that amplifies the vibration source and a transducer mechanism that converts the energy from the vibrations into electrical energy. Electromagnetic-based generators use Faraday's law of induction to convert kinetic energy into electrical energy.
In summary, electromagnetic induction is a process that converts kinetic energy from vibrations into electrical energy by using the relationship between electricity and magnetism. This principle has led to the development of various electrical devices and components, including vibration-powered generators.
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Broadband vibration energy harvesting
Vibration-powered generators are a type of electric generator that converts kinetic energy from vibration into electrical energy. These generators usually consist of a resonator that amplifies the vibration source and a transducer mechanism that converts the energy from the vibrations into electrical energy.
One approach to broadband vibration energy harvesting is to use piezoelectric cantilevered beams connected by springs. Piezoelectric cantilevered beams have been widely used as vibration-based energy harvesters, but they have a narrow frequency band, which leads to a significant drop in power generation if the excitation is slightly different. By connecting an array of piezoelectric cantilevered beams with springs, the frequency band of operation can be increased, and the output power can be enhanced. This configuration allows for the harvesting of broadband vibration energy, making it more suitable for practical applications.
Another technique for broadband vibration energy harvesting involves using ferromagnetic powder suspended in a non-magnetic fluid. This method utilizes electromagnetic induction to generate electricity from low-frequency vibrations (1 Hz or less). The magnetic flux of the magnetic field shapes the ferromagnetic powders into spike-shaped aggregates, and the slow vibration moves the fluid, which in turn moves the magnetic field in the aggregates, generating electricity in the coil. This approach has been shown to be effective in harvesting power at low frequencies and broadband.
There are also other methods for broadband vibration energy harvesting, including the use of electromagnetic micro-power generators, nonlinear generators, and advanced electronic networks. These techniques offer potential benefits, such as increased operating frequency range and improved energy harvesting efficiency, making them promising solutions for powering wireless sensors and other self-powered devices.
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Wireless sensor networks
One approach to enhance the lifespan of WSNs is through RF power harvesting, which involves recharging the batteries using radio frequency waves. These waves can be converted into electricity by receiving antennas called rectennas, which were invented in the 1960s. Rectennas can harvest electromagnetic radiation in the Wi-Fi, global satellite positioning, 4G, and Bluetooth bands and convert it into alternating current (AC) electricity. The AC electricity is then sent to a rectifier, which converts it into direct current (DC) electricity.
Another method of energy harvesting for WSNs is through low-level vibrations, which can be converted into electrical power through three basic mechanisms: electromagnetic, electrostatic, and piezoelectric. Electrostatic energy conversion is based on the variable capacitor, where mechanical kinetic energy is converted into electrical energy. Piezoelectric materials, when placed under mechanical stress, produce an open-circuit voltage, allowing for the conversion of mechanical energy into electrical energy.
Broadband vibration-based energy harvesting is another technique being explored for WSNs, which uses frequency up-conversion to increase the energy output. This method has been tested with an electrostatic MEMS energy harvester with a non-uniform comb design, showing promising results for overcoming the limitations of traditional designs.
Overall, wireless sensor networks have a wide range of applications and energy harvesting techniques such as RF power harvesting and vibration-based methods offer a way to extend the lifespan of these networks by eliminating the need for frequent battery replacements.
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Frequently asked questions
A vibration-powered generator is a type of electric generator that converts kinetic energy from vibration into electrical energy.
A vibration-powered generator usually consists of a resonator, which is used to amplify the vibration source, and a transducer mechanism, which converts the energy from the vibrations into electrical energy.
Vibration energy harvesting is a method of obtaining small amounts of energy from external elements such as heat, light, and vibration, which would otherwise be lost to the immediate surroundings.
Vibration-powered generators can be used to power wireless equipment and sensors. They can also be used to power embedded electronics, ubiquitous computing, low-power sensing, and wireless communications.
