CN100417808C - Wave power generation device based on permanent magnet vibrator - Google Patents

Abstract

The floating wave power generation device based on the permanent magnet vibrator belongs to the technical field of wave power generation. The hammer pulls the permanent magnet vibrators of each generator to reciprocate, and the windings placed on the generator stators output electric energy through electromagnetic induction. It has the advantages of simple structure, flexible use and low cost.

Description

Wave power generation device based on permanent magnet vibrator

technical field

The invention belongs to the technical field of ocean wave energy utilization.

Background technique

With the development of science and technology and the acceleration of the modernization process, the human demand for energy is increasing day by day, resulting in a sharp rise in primary energy consumption, especially the depletion of resources such as oil, natural gas and coal.

Ocean wave energy is an inexhaustible pollution-free renewable energy. After the ocean wave energy is converted into electric energy, it can provide electric power to marine beacon lights, coastal residents, island residents or soldiers guarding islands, so the present invention has broad application prospects.

From the research situation at home and abroad, there are three main types of traditional wave energy power generation devices: (1) poly-wave reservoir type power station. For example, in 1986, Norway built a polywave reservoir-type power station with an installed capacity of 350kW. The power station has an open horn-shaped wave condenser and a tapered wedge-shaped channel. When the wave enters the wide end of the wedge-shaped channel, it will When propagating, the wave height is continuously amplified until the wave crest overflows the side wall, converting wave energy into potential energy. The wedge-shaped guide trough functions as a wave concentrator and a converter. The channel is connected to a reservoir with a drop of 3-8 meters from the sea level, and conventional water turbines are used for power generation. The advantage of this power generation method is that there are no moving parts for wave energy conversion, good reliability, low maintenance costs, stable output, and not affected by wave height and cycle; the disadvantage is that the construction of this power station has strict requirements on terrain and is not easy to popularize. (2) Oscillating water column type wave power generation device. Such as the 75kw and 500KW shore-type wave power plants in the UK, the 500KW shore-type wave power plants in Portugal, and the 3KW, 20KW and 100KW shore-type oscillating water column wave power stations in Guangdong in China. The advantage is that this type of device uses the air in the air chamber as the medium to transmit wave energy, avoiding direct contact of the more fragile electromechanical parts with waves, reducing the destructiveness of waves, and increasing the reliability of the device. However, the disadvantage of this type of device is that the construction cost is expensive and the construction is difficult. It needs to build an air chamber, and the cost of building the air chamber accounts for more than 1/3 of the total cost, and this type of device uses compressed air to drive the air turbine to do work. Air turbines are less efficient in reciprocating flow. Therefore, due to the two major disadvantages of high cost and low conversion efficiency, the oscillating water column type wave power generation device is difficult for users to bear in terms of price, and it is difficult to form a market. (3) Pendulum wave power station. Different from the oscillating water column type, it uses waves to push a pendulum plate, and drives the generator to generate electricity through the hydraulic transmission system. Such as Japan's 80kW pendulum power station in Hokkaido and China's 30kW pendulum power station in Shandong Daguan Island. It also has the disadvantages of high construction cost and low conversion efficiency.

Contents of the invention

The object of the present invention is to provide a permanent magnet vibrator-based floating wave power generation device with simple structure, flexible use and low cost.

The present invention is characterized in that: it contains a trapezoidal polygonal hollow bracket with a trapezoidal longitudinal section; the generator is evenly distributed and fixed on each slope of the bracket from the outside; The magnetic pole width of the permanent magnet is equal to the width of the stator teeth; the permanent magnet vibrator passes through the stator core and the stator winding of each generator above along the width direction of the permanent magnet; the permanent magnet vibrator The lower ends are respectively connected with a spring fixed on the protruding part outside each slope of the above-mentioned support; the heavy hammer is located on the center line of the above-mentioned polygonal hollow support, and steel wire ropes are evenly fixed around the heavy hammer. The number of machines is equal, and each steel wire rope is respectively connected to the other end of each permanent magnet vibrator after bypassing the pulleys fixed on the outer surfaces of the above-mentioned polygonal support.

Experiments have proved that with the ups and downs of the waves, the weight will pull the permanent magnet vibrators of each generator to reciprocate, and the generators can generate periodically changing induced electromotive force.

Description of drawings

Figure 1 The floating wave power generation device based on the permanent magnet vibrator:

a. Front view; b. Top view;

Among them: 1. Generator; 2. Pulley; 3. Heavy hammer; 4. Steel wire rope; 5. Bracket; 6. Spring; 7. Bolt and iron ring.

Figure 2 Schematic diagram of the structure of the permanent magnet vibrator and the generator stator:

a. The relative position diagram of the stator and the vibrator; b. The top view of the vibrator; c. The transverse section of the stator and the vibrator;

Among them: 8. Stator core; 9. Stator winding; 10. Permanent magnet; 11. Vibrator; 12. S pole of permanent magnet pole;

13. The N pole of the permanent magnet pole.

Figure 3 The waveform diagram of the induced electromotive force at the stator winding end of the generator.

Detailed ways

The wave power generation device of the present invention is a floating wave power generation device based on a permanent magnet vibrator. The feature of this power generation device is that there is a heavy hammer in the center, which is connected to the permanent magnet vibrators of multiple generators through steel wire ropes. With the undulation of the waves, the heavy hammer pulls the permanent magnet vibrators of each generator to do reciprocating motion, and through electromagnetic induction, the permanent magnet vibrators are placed The winding on the stator of the generator sends out electric energy, obviously, it is different from the mode of traditional poly-wave reservoir type, oscillating water column type or pendulum type wave power generation device. The floating wave power generating device has a simple structure, is easy to manufacture, and has low cost. A wave power generation "field" is formed by many of these floating wave power generation devices generating electricity together. Moreover, when a strong storm is encountered, this floating wave power generation device is more flexible, and can be pulled into a safe harbor by a boat to avoid damage; after the strong storm passes, the wave power generation device can be placed in a desired location. Of course, if it is used for navigation lights or other purposes and cannot be transferred, the design of the structure from the floating body to the wave generator must consider that it can withstand the test of strong storms without damage. The main structure of the wave power generation device is shown in Figure 1 1a, 1b. The power generation device is mainly composed of a bracket, a permanent magnet vibrator generator, a weight, a pulley, a wire rope, a spring, etc., and the whole device is placed in a closed floating body or a cabin.

The core component of the whole wave power generation device is the permanent magnet vibrator generator. The structure of the stator and vibrator of the generator is shown in Figure 2. Among them, the generator stator is composed of multiple stator modules, the stator windings are embedded in the slots of the stator, and the stator modules are independent of each other, as shown in 2a of Figure 2. In this figure, only three stator modules are taken as an example. The permanent magnet is embedded on the vibrator. Looking at the permanent magnet from the top of the vibrator plane, it is arranged alternately according to S and N poles. The width of the permanent magnet (that is, the width of the magnetic pole) is equal to the width of the stator teeth. The permanent magnet can be used with better magnetic properties. Rare earth permanent magnet materials, such as NdFeB permanent magnet materials, etc., as shown in 2b of Figure 2; the magnetic poles of each permanent magnet itself form a magnetic circuit through the stator core. If the upper part of the permanent magnet is an N pole, the lower one is an S pole. Pole, when the vibrator moves back and forth, the flux linkage changes, so that the coil winding embedded in the stator core slot generates an induced electromotive force, as shown in 2c of Figure 2.

As the waves fluctuate, the weight will pull the permanent magnet oscillators of each generator to reciprocate, and the stator windings of the generators will generate induced electromotive force through electromagnetic induction. The simulation waveform of the induced electromotive force when the weight moves up and down is shown in Figure 3.

Claims (1)

1. A wave power generation device based on a permanent magnet vibrator, characterized in that it contains A polygonal hollow bracket with a trapezoidal longitudinal section; A generator, which is evenly distributed and fixed on each slope of the above-mentioned support from the outside; The permanent magnet vibrator is composed of a vibrator made of non-magnetic material and a permanent magnet embedded in the vibrator. The magnetic pole width of the permanent magnet is equal to the width of the stator teeth; the permanent magnet vibrator is along the direction of the magnetic pole width of the permanent magnet. passing through the stator cores and stator windings of each of the generators; the lower ends of the permanent magnet vibrators are respectively connected to the springs fixed on the protrusions on the outside of each inclined plane of the above-mentioned bracket; The heavy hammer is located on the center line of the polygonal hollow support, and steel wire ropes are evenly fixed around the heavy hammer. The number of steel ropes is equal to the number of the above-mentioned generators. The upper pulley is connected with the upper ends of the above-mentioned permanent magnet vibrators.

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