FR2480860A1 - Energy recovery system using wave power - includes large pivoting plate moving linear electromagnetic generators as waves rise and fall - Google Patents

Abstract

The system includes a framework comprising four upright pillars standing at the corners of a rectangle. A large flat plate (1) is fastened between pivots (2) on two of the upright pillars, and sliding carriages (3) on two horizontal rails joining pairs of pillars. Screws or jacks (11) are provided for the adjustment of the vertical position of the fittings attached to the four pillars. The plate is lifted by a wave and in moving this way the carriages (3) move horizontally along their support rails (4). After a wave has passed, the plate is allowed to fall pushing the carriages along their rails. Induction coils mounted in the support rails produce an electrical output as the carriages carrying magnets move along them.

Description

DESCRIPTION;
Device for recovering the energy of the vaques and transforming it into electric current.

To date, in order to recover wave energy, the devices studied pose problems that are not solved.

The goals sought are to obtain regular cir- cular movements that operate generators, such as electric alternators.

The waves have very complex motions where several components come into play. First there is the wave motion created by the wind.

The winds blow over a large area, sometimes over several hundred kilometers. Energy accumulates with distance and can put huge masses of liquid in motion. It is this energy that interests us. Yearly forces interfere and change the movements. For the record, tides and ocean currents. The ebb and flow of the tides changes the average sea level every six hours. The ocean currents are influenced by the rivers and the seabed by the amplitude of the tides: all these causes make these currents very variable in strength and direction. As to the shore the waves are observed, and we perceive that they are all different from each other like the figures of the different persons in a crowd.
On the same wave, the crack is not uni.form. The left part does not look like the central part and these two parts are different from the right part. The same wave changes as time goes by at every moment it is different from its past and its future. The waves have very com- plicated movements, their transformation into uniform circu- lar movement poses very difficult problems which are not yet solved.

The study of the forces involved makes it possible to dissociate two phenomena
1 an alternative phenomenon from bottom to top and from top to bottom undergoing a floating body When it is in the hollow and at the top of your wave ... Let's take an example that can give us an idea of the expected work. A small coaster of 1020 tons undergoes the movements of a swell of 3 meters every 15 seconds with each descent one can hope for a work of 1 020x3 or 204 tons meters per seconds.Soit the equivalent of a cilute d ' water of 2 @@ meters with a flow close to IM3 per second is the equivalent of 2 mega watts but the small coaster on a rough sea gives no work (except that provided by auxiliary forces or forces of inertia) for it is in equilibrium on the surface of the sea, it is like a weight in equilibrium on the plateau of a swinging Roman balance. There is no work provided.

In order to obtain this work it is necessary to break this equilibrium, that is to say to block the coaster at its high part, to wait for the crest of the wave to move and make way for a hollow, the floating body is then suspended in the void. By releasing the lock the floating body falls off and can provide a job.

 20 there is a horizontal phenomenon of translation if one observes the waves 3 meters high they roughly resemble a triangular prism of 3 meters high and base of about 9 meters (for example! They move horizontally at the speed close to 2 meters per second they have a kinetic energy per linear meter of wave given by the working formula = 1 of m V2.

Liquid mass 3x9 = 13.5 M3 is 13.5 m V2 = 13.5x22 = 27t meter
As the waves follow one another roughly every 15 seconds, that is 27 = 1.6 6 tm.

By taking a wave front of 30 meters we can expect roughly mega Watt minus the friction force that is notabie.

Currently this energy is found on the edge of coast in mechanical energy that erodes the shore, brews the sand and exerts a friction on the seabed. The energy is degraded in heat.

 It is common observation that a bather finds the sea warmer when it is agitated than when it is calm.

The advantage of our device is to simplify movements as much as possible and to get rid of the uniform circular motion. The roughly sinusoidal movement of the waves is transformed into a vertical reciprocating motion that drives a linear electric generator.

The device comprises a floating flat caisson (I) "type gate leaf door". It is suspended vertically by its upper edge where an axis (2) allows to rotate it. Its lower edge then descries a circle. At @ e @ tremities of its lower edge are fi @ és 2 carriages "type wagen boggie" (3) which can roll on 2 tracks (4) the movement in bow of cergle of the lower edge of the vantai I advance the trolleys (3) on the bearing track (4) and
requires to have an asce.national movement.

At this moment when the system is at its highest position it is locked by a mechanical or electromagnetic system (by sending an additional accessory current in the external coils of the linear generator) the wave is passed, the system remains suspended in the vacuum , we release the lock, and
the system resumes its rest position thanks to the forces: gravity. To guide these movements, the 2 horizontal raceways (4) are fixed at their end on carriages (5) movable on the vertical columns (6). The energy is recovered on the carriages at the ends of the horizontal raceways (4). A linear electric generator, it is formed by a coil battery (8) closed magnetic circuit; They are integral with the road of horizontal bearings (4) so they are mobile with them.

These closed magnetic circuit coils are like an electric motor stator stacked over several meters. This coil battery (8) forms a hollow axis in the center where the inductive boilers (9) are fixed excited by an accessory current.

The outer moving coils (8) are actuated by the two horizontal rolling paths (4) to obtain a current.

three-phase, it is necessary to have 3 fixed coils (9). If the spacing of the axes of the external coils (8) is "d" the spacing of the axes of the fixed inductor coils (9) will be (d, + d). The collector (12). will be mobile and synchronous external coils. The coal of the collector terminals (13) will be opposite the axes of the fixed (9) inductive coils; the collector terminals (13) will also be fixed. To have the same phase decall-ag-e must be arranged between the upper and lower terminals a phase inverter, the inverter being actuated each time the coils induced external invert their movement.

Special device to correct the effect of tides. It is necessary to suspend the upper part of the leaf and the central coil-inductive, on the gantries (10) on which one can act by means of cylinders (II) controlled by an electronic brain.

Claims (2)

claims  10 Apparatus for recovering wave energy and converting it into electrical energy, characterized by a flat box "type gate leaf door". Its upper edge is fixed by an axis (2) to a portico on which cylinders (II) can adjust in height at the average wave level and the height of the tides, thanks to an electronic brain. Under the thrust of the wave, "the leaf" pivots in an arc and in -tetne by means of trolley (3) 2 horizontal raceways (4). These raceways (4) are guided at their ends by carriages on 4 vertical columns. A locking system (5) locks or electromagnetic brake block the system at its upper part to allow the wave to pass.When the system is suspended in a vacuum is released the locks, and the system under the forces of the gravity returns to its vertical equilibrium by releasing its mechanical energy on a linear electric generator whose induced external coils are coupled to the rolling-horizontal paths (4). 20 Apparatus according to claim N9 I characterized in that the linear generator is reciprocating linear and which comprises two kinds of external coils (8) closed magnetic circuit, are stacked in battery over several meters and provide the usable induced current . The center distance of each coil is hollow and forms a central channel. In this central channel are 3 fixed coils (9); the distance d + d separates the middle of the height of each fixed coil. Where d is the distance separating the middle from the height of the moving external contact coils. Fixed coils are excited by an accessory DC current which creates magnetic fields. The operating current induced in the mobile external coils is collected on a collector (12). This collector is secured to the outer coils so mobile. The collector terminals (13) are fixed and positioned facing the middle of the fixed internal coils. An inverter switches the top and bottom terminals at the top and bottom at each variation of the system stroke to have the same phase shift. at the level of the three-phase current collected.