In one embodiment, the electrically conductive coil is a polymer-coated electrically conductive coil surrounding the magnetostrictive component. This need drove the development of new exotic materials such as terbium alloys (e.g. The identification and development of new cost-effective, energy-efficient and environmentally friendly power generation technologies will result in economic, health and security benefits to the US and global populations.
Embodiments also relate to a method and device for harvesting ocean wave energy that has the potential to deliver energy that is equal to or lower in cost than coal based power generation without subsidies or incentives. Magnetic field modeling can be used to design low cost permanent magnet assemblies (based on small rare earth magnets that can achieve the bias fields using, for example, Vizimag 3.18 software. The pre-stress and/or bias magnetic fields 704 (or magnetic domain orientations 702) may be incorporated into the magnetostrictive elements 110/components 108 during processing. 108 using a loading fixture 602, the magnetic domain orientations can be rotated away from the loading direction so as to be perpendicular to the loading direction. However, while these devices were not pushed to determine the maximum power efficiency, this body of work has shown energy efficiency from mechanical to electrical energy of 60-80% in constant displacement mode over a wide range of frequency (0-2000 Hz) using magnetostrictive materials.
Dolor Neuropático Que Es
This phenomenon can be utilized to generate a significant change in magnetic permeability and therefore magnetic flux density within magnetostrictive materials with a change in tensile stress. In some embodiments, methods and devices are included to incorporate magnetostrictive components with the appropriate combination of bias magnetic field and pre-stress that will provide the maximum change in the B -Field in specific magnetostrictive alloys into systems that are designed to generate electric power. Conventional approaches to harvesting ocean energy have been delinquent across all three of these criteria- they are too capital intensive, have non-competitive energy costs, and require very specific ocean environments which limits the number of potential locations and thus the scale of impact. The technology is clean and creates electricity from ocean waves without consuming any carbonaceous fuels or generating any harmful pollutants.
Fig. 8 depicts a flow diagram of a method for harvesting electrical power from water mechanical energy. Iron-aluminum alloys were first explored as magnetic alloys in the 1950s – while they have moderate saturation magnetostriction values (100-140 ppm), their magneto- mechanical coupling can approach that of iron-gallium and values as high as 13.7 Mega- Joules/m3 have been measured for Fe-16 Al (See Figure 3). Remedios caseros de dolor de espalda . Fig. Fig. 3 depicts a graph diagram of one embodiment of a comparison of magneto- mechanical coupling coefficients for various magnetostrictive materials.
The low hysteresis will result in low magnetomechanical coupling losses, again resulting in improved energy efficiency. 3 depicts a graph diagram of one embodiment of a comparison 300 of magneto-mechanical coupling coefficients for various magnetostrictive materials. While many embodiments are described herein, at least some of the described embodiments describe a wave energy harvesting system utilizing magnetostrictive materials that can enable highly cost-efficient energy harvesting from ocean waves, or other wave environment, while providing extremely good durability and reliability. When a tensile force 706 is applied, such as by the buoy 102, the load in the magnetostrictive component 108 changes from compressive to zero or slightly tensile resulting in a complete rotation of the magnetic domains 702 and a very high efficiency of energy conversion. Fig. 8 depicts a flow chart diagram of one embodiment of a method 800 for harvesting electrical power from water mechanical, or hydrodynamic, energy.
Embodiments of the apparatus cover any device or method for harvesting or generating electric power that incorporates a magnetostrictive component 108, which includes a component containing a material whose magnetic properties change as a function of applied stress at least along one direction within the material. The method also includes generating electrical power using the change in the magnetic flux. Such technologies will not only fuel economic growth and contribute to global environmental sustainability, but also reduce our dependence on exhaustible fossil fuels in the coming decades.
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A higher electrical resistivity can help to minimize eddy current losses in the magnetostrictive material and increase energy efficiency. 3. The material should have a high internal resistance. In one embodiment, both a physical pre-stress force and an initial bias magnetic field must be present in the magnetostrictive component 108 in order to generate power. Fig. Dolor en parte baja de espalda . 7 depicts a schematic diagram of one embodiment of magnetic domain orientation 700 in a magnetostrictive component 108 under various stresses/magnetic field configurations.
7. Powder compaction followed by sintering under magnetic fields. 6. Melt solidification under magnetic fields. The method includes: tethering a water flotation device to an anchor by a tether, wherein the tether comprises a magnetostrictive component, the magnetostrictive component comprising a pre- stressed magnetostrictive core, wherein a magnetic property of the magnetostrictive core is configured to change with changes in stress within the magnetostrictive core along at least one direction within the magnetostrictive component. The magnetic property of the magnetostrictive core is configured to change with changes in stress within the magnetostrictive core along at least one direction within the magnetostrictive component. For example, consider the curve 505 for the bias magnetic field of 22.3 Oe in Figure 5. If the material has a pre-compressive stress of 30 MPa, the magnetic field within the material is around 0.3 Tesla. For the purposes of this description, a magnetostrictive material may be considered to be any material that can be designed or configured such that a change in applied stress can result in a change in the magnetic flux and/or magnetic field (the B -field) within the material.
204 is applied to the material 202. Fig. In magnetostrictive materials, the application of a compressive stress reduces its magnetic permeability in the direction of the applied compressive stress. 604 previously described plus an “H-Frame” 606 (or compression frame) that holds the fixture 602 while the compressive load is applied. This effect has been studied in great detail for new magnetostrictive materials such as iron-gallium (Fe-Ga) alloys, and the data is shown in Figure 5. At higher compressive stress, a greater field is required to reorient the magnetic moments parallel to the axis of the sample. Stated another way, at larger compressive stresses, a higher bias magnetic field is required to reach saturation magnetization.
Since the primary objective of an actuator is to deliver displacement against a load, the key requirement for these applications is a high saturation magnetization. In one embodiment, the WEH’s buoys 102 are designed such that their vertical length exceeds the expected amplitude of oscillations of normal wave motion expected at the geographic location of interest. Dolor de espalda despues de comer . In this embodiment, the buoy 102 is always partially submerged whether it is at the crest or the trough of a wave.
The WEH 100 may also be designed such that even as a wave is at its trough, the submerged height of the buoy is more than what it would have been if the buoy 102 was not tethered to the ocean floor. Furthermore, embodiments described herein include the first known ocean device that uses advanced materials as a substitute for moving parts, thereby minimizing one of the main engineering challenges in the ocean environment.
- Tómala a pequeños sorbitos, justo antes de tus comidas
- Irritación de les meninxes na cefalalxa de la meninxitis por casu
- Mover cada parte del cuerpo varias veces al día
- Aromas primarios que se diferencian entre sí por el tipo de vid
- Hay más de 2 semanas con dolor persistente
The improvements outlined herein can further reduce WEH 100 system costs and increase system performance. Fig. 1 depicts a schematic diagram of one embodiment of a WEH 100, which may include a plurality of WEH devices. Each WEH device may be electrically connected to an electrical energy storage device 115. The electrical energy may be transformed or modified in any way, or may be transmitted to locations or devices. Fe-Ga is very similar to Fe-Al, except in the fact that it has a greater magnetostrictive strain. In one embodiment, the magnetic property is a magnetic permeability of a magnetostrictive component. 112 to the desired number of turns as shown in Figure 1(b). When a strain is imposed on magnetostrictive cores 110, it results in a change in a magnetic property of the magnetostrictive core 110. Such magnetic properties include the core’s magnetization (or flux density) and the associated magnetic field (See Figure 2). In one embodiment, the magnetostrictive elements are encased in structural casings 116 that are corrosion-resistant and water-tight, but allow for the majority of the tether load to be transferred to the magnetostrictive core 110 and also allow for water tight electrical connections.