A wave power plant includes a buoy and a power train. In the power train a driveshaft is arranged, which is driven to rotate either when the buoy rises or sinks, but always in the same direction. The driveshaft is mechanically coupled to one of the rotating parts of an electric generator and drives
A wave power plant includes a buoy and a power train. In the power train a driveshaft is arranged, which is driven to rotate either when the buoy rises or sinks, but always in the same direction. The driveshaft is mechanically coupled to one of the rotating parts of an electric generator and drives it for generating electric current. Furthermore, an energy accumulation device is provided which is also coupled to the driveshaft to accumulate energy when the buoy is rising or sinking and the driveshaft is rotating for driving the generator during the other of the rising and sinking movements. The coupling between the energy accumulation device and the driveshaft can extend via the other rotatable part of the generator, the air gap between the parts of the generator and the first part of the generator. The coupling over the air gap gives a torque, which drives the second part to rotate in one direction and which also counteracts the rotation of the driveshaft. The second part of the generator is driven by the energy accumulation device to rotate in the same direction, when the torque from the driveshaft does not exceed the counteracting torque.
대표청구항▼
1. A wave power plant comprising: a buoy arranged at or in a pool of water to be set into motion by movements of the water in the pool of water, wherein the buoy obtains movements, which alternate between a first movement in one direction and a second movement in another direction being different fr
1. A wave power plant comprising: a buoy arranged at or in a pool of water to be set into motion by movements of the water in the pool of water, wherein the buoy obtains movements, which alternate between a first movement in one direction and a second movement in another direction being different from the first direction,a driveshaft, which is rotatably mounted to the buoy, or to a device arranged to give a force counteracting movements of the water in the pool of water,a first elongated means, which both is coupled to a device arranged to give a force counteracting the movements of the water in the pool of water or to the buoy, respectively, and is coupled to the driveshaft,an electric generator, which is coupled to the driveshaft and includes two parts that are rotatable in relation to each other, a first part and a second part, andan energy accumulation device,the buoy, the first elongated means, the device arranged to give a force counteracting the movements of the waves, the driveshaft and the energy accumulation device being coupled to each other, so that the coupling between the first elongated means and the driveshaft makes, substantially for first movements of the buoy, the driveshaft rotate in only one direction and thereby drives said two parts of the electric generator to rotate in relation to each other in a first rotational direction and generate electric current and thereby also supply the energy accumulation device with energy, andwherein the energy accumulation device is arranged to drive, substantially for second movements, of the buoy, said two parts of the electric generator to rotate in the same first direction in relation to each other and thereby to generate electric current having the same polarity as when the driveshaft drives said two parts of the electric generator to rotate in relation to each other. 2. A wave power plant according to claim 1, comprising a buoy arranged to alternately rise and sink and/or to alternately rock or tilt back and forth at the up- and down-going movements of the water surface, the first movements of the water surface including either one of the up- and down-going movements of the water surface. 3. A wave power plant according to claim 1, wherein the driveshaft is mechanically coupled with the first part of the electric generator, an electromagnetic coupling existing over an air gap between the first and second parts of the electric generator at least during relative movements of these parts, andthe energy accumulation device is mechanically coupled to the second part of the electric generator. 4. A wave power plant according to claim 3, wherein the coupling of the energy accumulation device to the driveshaft via the second part of the electric generator and the first part of the electric generator and the air gap therebetween give a counteracting motive force, which counteracts the rotation of the driveshaft, when the driveshaft, through the coupling between the first elongated means and the driveshaft, rotates and drives the first part of the electric generator, so that the second part of the electric generator rotates in a first direction due to the coupling to the driveshaft via the electromagnetic coupling over the air gap and the first part of the electric generator, when the motive force acting on the driveshaft due to the coupling between the first elongated means and the driveshaft exceeds the counteracting motive force and the energy accumulation device then accumulates, due to its mechanical coupling to the second part of the electric generator, energy, the first and second parts of the electric generator at the same time rotating in the same first direction in relation to each other, andso that the second part of the electric generator is driven by the energy accumulation device to rotate in the same first direction substantially when the motive force acting on the driveshaft through the coupling between the first elongated means and the driveshaft does not exceed the counteracting motive force, whereby the first- and second parts of the electric generator are made to continue to rotate in the same first direction in relation to each other. 5. A wave power plant according to claim 1, comprising: a mechanical gear coupled between the driveshaft and the first part of the electric generator, the driveshaft being coupled to an input side of the mechanical gear and the first part of the electric generator being coupled to a first output side of the mechanical gear,an electromagnetic coupling existing over an air gap between the first part and second parts of the electric generator at least during the relative movements of these parts,the second part of the electric generator being rigidly attached to the buoy, andthe energy accumulation device being mechanically coupled to a second output side of the mechanical gear, the second output side being different from the first output side. 6. A wave power plant according to claim 5, wherein the input side of the mechanical gear includes an input shaft and an output side of the mechanical gear includes an output shaft and another output side includes a housing or casing for the mechanical gear. 7. A wave power plant according to claim 1, comprising an anchor drum, which is mounted to rotate in a single direction around the driveshaft and is coupled to the first elongated means to make the anchor drum rotate for said first one of the movements of the buoy and thereby also make the driveshaft rotate. 8. A wave power plant according to claim 7, wherein the first elongated means is a flexible means, a line, wire or chain, which at one end is more or less wound on an anchor drum, and that a mechanism is provided for rotating, for said second movements of the buoy, the anchor drum so that the flexible means is kept in a tensioned state. 9. A wave power plant according to claim 7, wherein the bearing for a providing rotation of the anchor drum around the driveshaft in a single direction, which bearing allows the anchor drum during rotation in the opposite direction to drive the driveshaft to rotate in the opposite direction, includes a coupling for limitation or disengagement of the motive force, with which the anchor drum then acts on the driveshaft. 10. A wave power plant according to claim 1, wherein the driveshaft is rotatably mounted in a buoy and the first elongated means at one end is coupled to a point counteracting movements of the buoy, to a fixed point such as to the bottom of the pool of water or to a device that is stationarily located at or attached to the bottom of the pool of water. 11. A wave power plant according to claim 1, wherein the driveshaft is rotatably mounted to a device fixed placed at the bottom of the pool of water and that the first elongated means at one end is coupled to a buoy. 12. A wave power plant according to claim 11, wherein the driveshaft is placed below the water surface and the energy accumulation device includes at least one floating body. 13. A wave power plant according to claim 1, wherein the driveshaft is rotatably mounted to the buoy and the first elongated means is at one end coupled with a weight elastically connected to the buoy. 14. A wave power plant according to claim 1, wherein the buoy includes a space which functions as an air pocket and in which at least the main part of the driveshaft is located. 15. A wave power plant according to claim 1, wherein the energy accumulation device includes a counterweight arranged as a lead which moves upwards for said first of the movements of the buoy and thereby obtains a larger potential energy, that the coupling between the buoy, the first elongated means, the driveshaft and the counterweight is arranged in such a way that the counterweight moves downwards for said second of the movements of the buoy and wherein the counterweight drives the first and second parts of the generator to rotate in relation to each other in the first direction. 16. A wave power plant according to claim 15, wherein the energy accumulation device includes a counterweight drum mounted to rotate about the driveshaft and a second elongated means for coupling movements of the counterweight to drive the counterweight drum to rotate, the driveshaft being coupled to rotate the first part of the electric generator and the counterweight drum being coupled to rotate the second part of the electric generator, the electric generator generating electric current when its second part rotates in relation to its first part and at the same time provides a torque counteracting this rotation, whereby the first- and second parts of the electric generator are made to rotate in relation to each other always in the same first direction. 17. A wave power plant according to claim 15, wherein the energy accumulation device includes a counterweight drum mounted to rotate about the driveshaft and a second elongated means for coupling movements of the counterweight to drive the counterweight drum to rotate and wherein a mechanical gear is coupled between the driveshaft and the first part of the electric generator, the driveshaft being coupled to an input side of the mechanical gear, the first part of the electric generator being coupled to an first output side of the mechanical gear, the second part of the electric generator being rigidly connected to the buoy and the counterweight drum being mechanically coupled to a second output side of the mechanical gear, the second output side being different from the first output side, so that the driveshaft gives, for said first movements of the buoy, motive forces on the two output sides of the mechanical gear for rotating the first part of the electric generator and for rotating of the counterweight drum to elevate up the counterweight in relation to the driveshaft and so that the counterweight drum gives, for said second movements of the buoy, via its coupling to the second output side of the gear, a motive force for rotating the first part of the electric generator. 18. A wave power plant according to claim 1, wherein the energy accumulating device includes a counterweight drum and a counterweight and the second elongated means is a flexible means, a line, wire or chain, which is at a lower end attached to the counterweight and is at its upper end more or less wound on the counterweight drum. 19. A wave power plant according to claim 1, comprising a control system for controlling the electric load of the electric generator for adjusting the rotation speed between the first and second parts of the electric generator. 20. A wave power plant according to claim 19, wherein the energy accumulation device includes a counterweight or a floating body and the control of the electric load of the electric generator also is used for adjusting the vertical speed of the counterweight or the floating body, respectively, so that the counterweight or the floating body, respectively, moves within an adapted or suitable vertical span during the movements of the buoy. 21. A wave power plant according to claim 20, wherein the control system is arranged to compensate for variations in the torque caused by the inertial of the counterweight or the floating body, respectively, by adjusting the rotation speed between the first and second parts of the electric generator, this giving a continuous, even power output from the electric generator. 22. A wave power plant according to claim 1, wherein the plant includes two electric generators and two associated energy accumulation devices coupled to the driveshaft, the first elongated means being coupled to the driveshaft at a place located between the two pairs of an electric generator and an associated energy accumulation device. 23. A wave power plant according to claim 1, wherein the first elongated means at least at one end includes two partial means, a first partial means being coupled to the driveshaft on one side of the electric generator and another partial means being coupled to the driveshaft on an opposite side of the electric generator. 24. A wave power plant according to claim 1, wherein the plant includes an anchor drum coupled to the first elongated means and that the first elongated means includes a flexible means, a line, wire or chain, which is at least at one of its ends divided into two partial means, one of which is more or less wound on corresponding winding surfaces of the anchor drum, the winding surfaces including helicoidally extending grooves having opposite helicoidal directions. 25. A wave power plant according to claim 1, wherein the energy accumulation device includes two counterweight drums mounted to rotate about the driveshaft and a flexible means, a line, wire or chain which is at least at one of its ends divided in two flexible partial means, each one of which is more or less wound on corresponding winding surfaces of the counterweight drums, the winding surfaces including helicoidally running grooves having opposite helicoidal directions. 26. A wave power plant comprising: a buoy arranged to be set into motion by water movements which alternate between a first movement in one direction and a second movement in another direction;a driveshaft being one of rotatably mounted to the buoy and rotatably mounted to a device arranged to give a force counteracting the water movements;a first line being coupled to one of the device arranged to give a force counteracting the water movements and the buoy, and being coupled to the driveshaft;an electric generator coupled to the driveshaft and having first and second parts rotatable in relation to each other; andan energy accumulation device;wherein the buoy, the first line, the device arranged to give a force counteracting the water movements, the driveshaft and the energy accumulation device are coupled to each other such that the coupling between the first line and the driveshaft causes, substantially for first movements of the buoy, the driveshaft to rotate in only one direction to thereby drive rotation of said two parts of the electric generator in relation to each other in a first direction to generate electric current and to thereby supply the energy accumulation device with energy; andwherein the energy accumulation device is arranged to drive rotation, substantially for second movements of the buoy, of said two parts of the electric generator in the first direction in relation to each other thereby generating electric current having the same polarity as when the driveshaft drives said two parts of the electric generator to rotate in relation to each other.
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이 특허에 인용된 특허 (17)
Karimi, Reza, Apparatus for converting wave, solar and wind energy.
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