For example, maximum practical efficiencies at resonance for currently available piezoelectric materials peak at under 0.2 (less than 20 percent conversion efficiency), while without resonance their efficiencies are drastically lower. In contrast, electromagnetic generation can easily exceed 50-60 percent and for large generators has significantly exceeded 90 percent. BACKGROUND ART Wireless sensor systems are becoming increasingly important for multiple applications ranging from security to predictive and condition-based maintenance in a wide variety of applications. FIG. 4 shows a conceptual diagram of an illustrative device according to a fourth embodiment of the invention for use, for example, in harvesting energy from the suspension of a vehicle. A second aspect of the invention provides a method for energy harvesting comprising: moving a magnet supporting structure with respect to a coil supporting structure based on motion of an object to which the coil supporting structure is affixed, wherein at least one of the magnet supporting structure or the coil supporting structure is configured to provide a restoring force to maintain a relative difference in motion between the magnet supporting structure and the coil supporting structure without regard to resonant phenomena; and generating electrical energy based on the relative motion between at least one magnet corresponding to the magnet supporting structure and at least one coil corresponding to the coil supporting structure.
- Olores o gustos extraños
- Decrementos en la participación en sus actividades
- Alergias en la piel, infecciones o heridas activas
- Ponte de pie y flexiona las rodillas, simulando la posición para sentarte
- Cómo comes, cómo te sientes
- Contrae los músculos del abdomen
- Ahorra para un buen presupuesto
SUMMARY OF THE INVENTION Despite this body of work, the inventors recognize that there still exists a dearth of technological innovation in the area of non-resonance dependent, low-frequency power harvesting, especially for the power regime between a few hundred microwatts and roughly ten milliwatts; this has been a sort of no-man’s land which is too high power to be practical for micro electro-mechanical systems (MEMS) and smaller-scale devices, and too low power for traditional wireless sensing devices which have average power draws in the tens or hundreds of milliwatts. Pat. No. 8,212,436 B2, describe a method for power harvesting using magnetomotive forces in magnetic materials to produce power. A considerable body of prior art is devoted to devising various means for harvesting this energy. This operation is contingent on the use of modern electronics; prior designs based on, for example, diodes were limited to harvesting electrical potentials of several hundred millivolts or more.
Dolor De Espalda
However, harvester power conditioning systems for low voltage inputs, such as Cymbet’s “EnerChip™” systems or those offered by Advanced Linear Devices, permit effective collection and harvesting of energy from potentials as low as tens of millivolts and a few hundred nanoamps, which makes harvesting at very low voltages practical. However, for vehicles and other operating mechanical systems, vibration and motion energy represent the most likely and commonly considered source. Conversely, if the magnets 164 are moving at a minimal speed, the controller 258 can switch the impedance of the coils 250 to a lower impedance to provide less resistance to the roll of the magnets 164. It should be noted that there are other methods to vary the impedance known to those skilled in the art, and any such methods may be used in this embodiment of the invention. At the low voltages and power levels anticipated for this design, such connections may either introduce significant potential physical damping (e.g., from connected wires that would have to be bent or moved with the coils) and/or points of failure from these connections, or may introduce additional contact resistance and friction issues.
Dolor Neuropatico Curso
Providing a wired power source significantly reduces the utility of most wireless monitoring applications, while batteries will eventually become exhausted and need to be replaced; this represents significant time and effort and may be very difficult to impossible in some wireless sensor settings (for instance, if a wireless sensor is to be embedded in a component to provide lifetime monitoring). In some frames of reference, the coils may move relative to the magnet, but the electrical connections and vehicle or object to which the entire device is attached will be stationary with respect to the coils. Dolor de espalda por gases remedios . A set of coils 138 are affixed to a shaft 140; the bearing 136 surrounds the shaft 140. The entire device is enclosed within a housing 142 which can protect the device from environmental and physical stresses and which may also contain the electronics which will make use of the generated power. All such modifications and variations that may be apparent to persons skilled in the art that are exposed to the concepts described herein or in the actual work product, are intended to be included within the scope of this invention disclosure.
Dolor De Cabeza
FIG. 6 uses the rolling-based harvester embodiment described herein in conjunction with FIGS. Note that in this embodiment, the design element providing the restoring force is the curved portion of the enclosure 162 rather than a weight as in other embodiments. Additionally, a similar approach may be used in other embodiments of the invention. The other coils 160 can have a single set of connections using the entire set of turns of each coil. In any event, the controller 258 can be configured to monitor the output voltages from the coils 160 and 250, and calculate the motion of the magnets 164. If the magnets 164 appear to be moving too swiftly (and thus in danger of hitting the walls of the enclosure), the modified coils 250 may be directed by the controller 258 to be switched via the switching device 254 to a higher impedance condition which will tend to exert more Lorentz forces upon the magnets 164, thereby slowing them.
Another embodiment of the invention involves attaching the magnet and coil components to different portions of an object, such as a vehicle, which undergo relative motion; for example, the spring and supports of a suspension. 3 b. A set of coils 160 are spaced along the sides of an enclosure 162. The bottom of the enclosure 162 is curved up at both ends and the coils 160 follow the curve; the enclosure 162 can serve both as rugged protection for the device (and potentially for any electronics associated with the device) and as support for the various components of the device. The designs of the rotor or framework 104 (e.g., the number of coils 102, the number of turns in coils 102, and/or the like) and/or the stator or framework 108 (e.g., the strength of magnets 106, geometry of the framework 108, and/or the like) can be adjusted to produce a desired amount of power to accomplish the desired amount of power using the available relative motion present during operation of the object.
Dolor Espalda Pecho
7,652,386 B2, Donelan et al describe methods for harvesting energy from the movement of joints, based on the relative motion of the components of a biological system (e.g., the motion of the knee joint). The foregoing description of various embodiments of this invention has been presented for purposes of illustration and description. The energy can be harvested in a non-resonance dependent manner and may harvest energy across a broad spectrum of vibrations and oscillations. Further aspects of the invention provide a method comprising moving a magnet-containing or holding structure with respect to a coil containing or holding structure, the movement caused by a response by the magnet-containing or holding structure which can be in a non-resonance dependent manner to excitation (e.g., motion) of an object or structure to which the device is attached; the response can operate over a wide range of frequencies and amplitudes, and the movement thereby can cause the generation of electrical current in the coils through the interaction of the magnetic field with the coils; and the magnet containing or holding structure can have a tendency to return to a base position or state due to a restoring force which is present due to a particular design element of the structure.
Some applications can harvest heat energy from associated systems, or use wind energy.
In any event, when coil framework 104 is affixed to an object, such as a vehicle, which oscillates in the plane of the coil framework 104 and magnet framework 108 during operation, the coil framework 104 will oscillate along with the object to which it is attached. Furthermore, the controller 258 can include components/devices capable of rectifying and storing electrical energy at very low voltages. Power harvesting-deriving energy for the sensor from some aspect of the sensor’s environment-has thus been of considerable interest to the industry. Dolor muscular pantorrilla . This assumption is good for coils with large area and negligible length. Various electronics may be attached to the coil or coils to store or make use of the energy generated from the device. Some applications can harvest heat energy from associated systems, or use wind energy. REFERENCE TO PRIOR APPLICATIONS The current application claims the benefit of U.S.
It is noted that the drawings of the invention are not necessarily to scale. The drawings are intended to depict only typical aspects of the invention, and therefore should not be considered as limiting the scope of the invention. In the drawings, like numbering represents like elements between the drawings. While some recent developments have claimed much higher efficiencies in the laboratory, no such materials are available for general use and may prove to be impractical in the real world. FIG. Dolor de la planta del pie causas . 2 shows a conceptual diagram of an illustrative device according to a second embodiment of the invention for use, for example, on the hub of a railroad car. DETAILED DESCRIPTION OF THE INVENTION As described herein, aspects of the invention provide a device comprising at least one magnet, at least one coil, at least one magnet containing or holding structure, at least one coil containing or holding structure, and a component or design element to provide a restoring force to either the magnet containing or holding structure or the coil containing or holding structure.
Dolor Neuropático Fisterra
Another alternative embodiment includes a device intended to harvest the motion of a slowly (e.g., two Hz or less) swaying object, such as a railcar on a track. These different connections 252 connect to different numbers of turns of the coil, effectively changing its inductance depending on which of the connections 252 are used. 2012, and which is hereby incorporated by reference. Another embodiment of the invention makes use of modern miniature generators, which in themselves comprise the magnet, coil, and magnet and coil containing and holding structures as described herein. While these can be harvested, as noted previously, many more devices exist to harvest higher voltages and currents; by using various gearing methods to increase the effective speed of the magnets past their respective coils, much higher voltages and currents can be generated, in accordance with Faraday’s Law as discussed. No. 7,821,183 B2, describes a system which uses motion of some mass to in turn excite cantilevered piezoelectric beams which generate electrical energy.
7,667,375 B2, Berkcan et al describe a harvesting system comprised of cantilevers of varying resonant lengths which generate energy through vibration by piezoelectric transduction. This concept is illustrated by FIG. Nair et al, in U.S.