Figure 3 illustrates schematically how, according to what is described in WO-2014/135551 -A1 , in the case of a pole having a radius (R) of approximately 60 mm at ground level, the radius increases to approximately 83 mm at the height (H) of 1 metre above the ground and to approximately 105 mm at a height of 4 metres above the ground. Figure 1 6B illustrates a similar arrangement, but with only three magnets following each other in the vertical direction. Figure 4 shows how the magnets are mounted on a total of five rows, of which the four top rows contribute to the electrical power generation owing to their interaction with the coils 50, while both the four top rows and the bottom row contribute to the auto-tuning of the generator to wind speed. In other words, in order for the turns to produce an electromotive force and to generate electric power, several levels of magnetic rings 30 (or a set of individual magnets arranged in the shape of a ring) have been arranged on the flexible rod 12. The number of levels of magnetic rings 30 is equal to the number of levels of coils plus one (there are four levels of magnetic rings associated to the three levels of coils 50 in figure 4). In this way, the movement of the magnetic rings produces a change of direction and sense of the field lines within the coils.
- Enfermedad degenerativa del disco
- Malestar post-ejercicio
- Dolores de entuerto MEDICINA Los producidos tras el parto por la retracción de la matriz
- The device as recited in claim 1 wherein
The effect achieved with this arrangement has been explained above, which serves for the natural oscillation frequency of the first part to adapt, automatically, to the frequency of appearance of vortices. If the wind speed continues to increase, the amplitude begins to decrease, since the vortices start to be generated too quickly, whilst the natural oscillation frequency of the structure remains constant. Therefore, a substantially constant drag force 1004 in the direction of the wind and a lift force 1005 substantially perpendicular to the general direction of the wind and to the direction of the drag force are produced on the pole 1. The biasing in the second direction, such as downwards, can in some embodiments be produced at least in part by springs and/or magnets and/or gravity.
Dolor De Oidos
In some embodiments, said at least one first magnet comprises a first plurality of magnets arranged substantially adjacent to each other, for example, above each other or side by side in the horizontal plane, and with polarities arranged (for example, in accordance with the Halbach array) so that the magnetic field produced by said first plurality of magnets is stronger on a side of said magnets facing said at least one second magnet than on an opposite side, and/or said at least one second magnet comprises a second plurality of magnets arranged substantially adjacent to each other, for example, above each other or side by side, and with polarities arranged (for example, in accordance with the Halbach array) so that the magnetic field produced by said second plurality of magnets is stronger on a side facing said at least one first magnet than on an opposite side.
Said at least one first magnet and said at least one second magnet are arranged in such a way that they repel each other and in such a way that when the oscillating movement occurs in the first part, the distance between said at least one first magnet and said at least one second magnet varies in accordance with said oscillating movement. In some embodiments of the invention, the generator is arranged so that as a result of the oscillating movement of the first part, an oscillating movement of the second generator module is produced, said oscillating movement being in a direction parallel with the longitudinal axis of the first part and having a frequency higher than the frequency of the oscillating movement of the first part. For example, the first and second magnets can be arranged as rings of magnets having a truncated cone shape or at least one surface shaped as a truncated cone.
In some embodiments of the invention, the magnets 30, 31 and 32 mounted on the flexible rod 12 may have ferromagnetic material attached to them to conduct the field lines in a suitable manner for, for example, increasing, within a given space, the number of polarity/direction changes of the magnetic field, to maximize the number of changes of direction of magnetic field to which the coils 50 are subjected during a cycle of oscillation of the pole. In some embodiments of the invention, the second annular frame member includes a plurality of through holes, the connecting members passing through respective ones of these through holes, whereby the through holes have an extension in parallel with the longitudinal axis of the first part sufficient to allow a relative movement between the connecting members and the second annular frame member in parallel with the longitudinal axis of the first part, when the second generator module is moving or oscillating in parallel with the longitudinal axis of the first part.
This variation can serve to induce an oscillation of the second generator module in parallel with the longitudinal axis of the first part, and this oscillation implies a relative movement between magnets and coils, thereby converting kinetic energy into electric energy. Figures 7 and 8 show two sets of magnets associated to the pole, according to a possible embodiment of the invention.
Dolor Espalda Pecho
The number of rings, the size of the coils, etc., is something that the person skilled in the art will chose depending on aspects such as the size of the generator, the displacement in the lateral direction of the flexible part during the oscillation, etc., with the purpose of achieving an optimal or at least acceptable performance of the generator. The generator also comprises a second part that surrounds, at least partially, said first part. The method comprises the step of placing at least one first magnet on the first part and at least one second magnet on the second part, such that said at least one first magnet and said at least one second magnet repel each other.
In this context, the terms “rigid” and “flexible” are used to indicate that the oscillatory movement is substantially owing to the deformation of the substantially flexible/elastic part and not to any deformation of the substantially rigid part. Obviously, there is no direct relation between the mass of the first part as such and its inertia, as the first part is not moving linearly but rather carries out a pivoting or pendulum- like movement in relation to a certain point, wherefore its inertia has a substantial rotary component. For example, in the case of a pole-shaped first part that does not have a system for adapting the resonance frequency, when the wind speeds are too low the pole does not oscillate. However, these aerogenerators, which have had great success worldwide and, in many countries, produce a major share of the electrical energy consumed, usually have a large number of moving parts, many of which come into contact with each other in a rotating manner, thus implying, amongst other things, relatively high maintenance costs, owing to the consumption of lubricants, component wear, etc.
In other embodiments of the invention, the coil or coils can be arranged in the second generator module and the magnet or magnets in the first generator module. Thus, oscillation of the first part in relation to a vertical axis is arranged to trigger the second generator module to oscillate up and down. This choice of triggering can help to make sure that, for example, a plurality of magnets (“displacing magnets”) attached to the first part are appropriately positioned in relation to corresponding magnets (“displaced magnets”) on the second generator module, so as to provide for appropriate triggering, irrespective of the orientation of the plane in which the first part is oscillating.
This double biasing, that is, the fact that the second generator module is subjected to forces in opposite directions, means that the second generator module can be floating in relation to a position of equilibrium of the biasing forces, and can be caused to oscillate in relation to said position of equilibrium by the oscillating movement of the first part. Dolor detras de la rodilla izquierda . The triggering can preferably be impulse-like, that is, take place during short time periods. For example, the connecting members can be made of materials with high mechanical quality factor and high fatigue resistance, such as carbon fibre, titanium, steel, etc. The energy generated by the coils 50 can be appropriately rectified and conditioned by a power electronics system 60, which may include for example an inverter, etc., and a conduction system 61 can evacuate the electric power generated.
The upper end of the pole is preferably closed, for example, by a cap. In some cases, the high speed of the blades may also be a problem, since they may impact bird life. It can also be useful to facilitate implementation of a second generator module oscillating at a frequency different from the frequency of oscillation of the first part. In some of these embodiments of the invention, the first part, due to its oscillating movement, repetitively interacts with the second generator module and transfers momentum to the second generator module, which thereby continues to oscillate, the frequency of its oscillation depending on a plurality of factors, including dampening due to the generation of electric power, the characteristics of the biasing means, the stiffness of the connecting members, the mass of the second generator module, etc. Figures 1 and 4 show how in this embodiment of the invention the static structure 2 comprises a substantially cylindrical wall 21 which surrounds the pole 1 in correspondence with its bottom part.
In this way, the very structure of the generator of figures 1 and 4, with its magnets 30 and 40, contributes to an automatic increase in the resonance frequency of the pole when the wind speed increases and vice versa. One effect of the invention is that, owing to the adaptation of the natural oscillation frequency of the system, the lock-in range can be widened. Thereby, movement of the second generator module in the axial direction is facilitated, whereas movement in a direction perpendicular to said axial direction is made more difficult. US-2008/0048455-A1 describes another example of electrical generator based on Karman vortices, based on the use of a gyroscopic electrical generator. That is, the second generator module is biased or subjected to forces acting in two opposite directions, such as upwards and downwards, by different means or devices.