CN201156699Y - Wave Permanent Magnet Linear Generator - Google Patents

Abstract

Ocean wave permanent magnet linear generator is a new type of permanent magnet linear synchronous motor used for ocean wave power generation. The mover of the linear generator is driven by the wave movement through the energy converter, and the mover cuts the stator winding of the linear generator to generate an induced alternating current. Therefore, this device is a device that uses linear motion to convert sea wave motion energy into electrical energy. The generator is provided with a primary three-phase winding (2) inside the primary iron core (1); the secondary mover includes a secondary iron core (4), Secondary upper right permanent magnet (5), Secondary upper left permanent magnet (6), Secondary non-magnetic material (7), Secondary lower right permanent magnet (8), Secondary lower left permanent magnet (9); Secondary upper right The permanent magnet (5) and the secondary lower right permanent magnet (8), the secondary upper left permanent magnet (6) and the secondary lower left permanent magnet (9) respectively form a pair of poles, and are respectively located outside the secondary core (4), The magnetic paths on both sides are separated by secondary non-magnetic conductive material (7).

Description

Wave Permanent Magnet Linear Generator

technical field

The utility model is a novel permanent magnet linear synchronous motor used for ocean wave power generation. The motion of the ocean wave is used to drive the mover of the linear generator through the energy converter. The mover cuts the stator winding of the linear generator to generate an induced alternating current. Therefore, this device is a device that converts the motion energy of ocean waves into electrical energy by using linear motion. The technology can be applied to the field of ocean wave power generation.

Background technique

The ocean is vast, covering 70.8% of the earth's surface. The ocean is "three feet of waves without wind", and there is huge energy in the waves. The invention of advanced wave power generation equipment and the use of marine resources are of great significance to solving the world's energy problems. The application of permanent magnet linear generator to ocean wave power generation is a promising new technology.

Since the 1970s, due to the oil crisis, scientists from various countries began to explore wave power generation and developed several different types of wave power stations. The wave power generation system is composed of wave energy, energy converter, generator system, and power transformation equipment. Among them, the energy converter converts wave energy into energy that can be absorbed by power generation equipment, which is directly related to the effect of wave power generation, so it is an important power generation device; the generator system includes a rotating mechanism and a traditional generator. The motor generates electricity, reducing the intermediate rotating mechanism; the function of the substation equipment is to convert the electricity of different frequencies generated by the generator into power frequency electricity for use by users. After more than 30 years of research, scientists have designed dozens of different power generation devices to improve power generation efficiency. This form of power station is already in use in the UK, and the electricity generated is already connected to the grid.

There are two ways of wave power generation: 1. Shore wave power station, which is about to build power generation equipment on the shore. This kind of power station is easy to realize, but the disadvantage is that the waves obtained are small, the power generation is not large, and the power station is vulnerable to storms, and its ability to resist storms is poor. The other is an offshore power station, where power generation equipment is built on a ship or a derrick. Currently, scientists are exploring building a power station underwater. This kind of power station can be far away from the coast, obtain more wave energy, generate a large amount of power, and because the power generation equipment is underwater, it is not easy to be attacked by storms. The present invention can be directly applied to these two power stations without the need of an intermediate transmission mechanism, and the linear motor is directly driven by the sea wave converter to generate electricity. Simplify power generation equipment.

200710021763.4 The inventor published an invention application "Permanent Magnet Linear Synchronous Motor for Ocean Wave Power Generation". It includes two stator cores, two sets of stator windings, and a mover composed of N and S interlaced permanent magnets. The magnetic field of the mover that changes with the motion of the sea cuts the stator windings, generating an induced electromotive force. The mover of this invention does not need an excitation winding, has a simple structure and requires less maintenance. However, we found in the subsequent electromagnetic analysis that the mover structure composed of permanent magnets can be further optimized, so we propose a new type of permanent magnet mover.

Contents of the invention

Technical problem: The purpose of this utility model is to provide a permanent magnet linear generator for ocean waves. The permanent magnet linear generator for ocean waves of this utility model can be directly applied to these two power stations without the need for an intermediate transmission mechanism, and is directly driven by the ocean wave converter The linear motor generates power, which simplifies the power generation equipment.

Technical solution: The wave permanent magnet linear generator of the utility model includes a primary iron core, a secondary mover and an air gap. The primary core is located on both sides of the generator, the secondary mover is located in the middle of the primary core, and there is an air gap between the primary core and the secondary mover (as shown in Figure 1); there is a primary three-phase winding inside the primary core ;The secondary mover includes secondary iron core, secondary upper right permanent magnet, secondary left upper permanent magnet, secondary non-magnetic material, secondary right lower permanent magnet, secondary left lower permanent magnet; secondary right upper permanent magnet and secondary The lower right permanent magnet, the secondary upper left permanent magnet and the secondary lower left permanent magnet respectively form a pair of poles, and are respectively located outside the secondary iron core, and the magnetic routes on both sides are separated by the secondary non-magnetic material. The secondary upper right permanent magnet and the secondary upper left permanent magnet have the same polarity, the secondary lower right permanent magnet and the secondary lower left permanent magnet have the same polarity, and the secondary upper right permanent magnet and the secondary lower right permanent magnet have the same polarity On the contrary, this layout makes the electromagnetic force in the parallel direction initially received by both sides equal, and the air gaps on both sides are equal. There is an air gap of 0.5-1 cm between primary and secondary.

1) The sea wave converter whose pressure changes with the sea wave movement directly drives the permanent magnet of the mover to move in a straight line, so that a magnetic field that changes with time is generated inside the linear motor;

2) The magnetic field moves up and down to cut the winding of the permanent magnet linear motor, so an induced electromotive force is generated in the winding. If the external circuit is closed, the wave power will be converted into electrical energy for power generation;

3) A horizontal electromagnetic force will be generated between the moving magnet and the stator. In order to prevent the stator and rotor of the motor from being attracted together, we use double primary and double secondary windings to balance the electromagnetic force.

4) The secondary composed of separate permanent magnets generates independent magnetic circuits on both sides of the air gap, and the magnetic field distribution is shown in Figure 2. After analyzing the magnetic field software, it is found that if a magnetic field of 0.7~1.0T is to be generated, the use of this permanent magnet structure can save 1/3~1/4 of the permanent magnet material compared with the structure shown in Figure 1. This invention reduces the consumption of a lot of permanent magnet materials and saves cost.

The frequency of the alternating current from the linear motor is the same as that of the permanent magnet, which is a frequency-changing power supply. It is necessary to use an AC-AC frequency conversion device to convert the frequency of the linear generator into a power frequency of 50Hz, and transmit it to the user or the power grid.

Beneficial effect:

1) The separated permanent magnet is used as the secondary of the linear motor to improve efficiency, reduce the amount of permanent magnets, and greatly save costs.

2) Ocean wave power generation uses linear motors to generate electricity, reducing intermediate links and saving costs;

3) Ocean wave power generation will not produce toxic gas and pollute the environment like thermal power.

4) The cost of this kind of equipment is low, and the cost of generating electricity is much lower than that of solar energy and tidal energy. It can almost be compared with the price of conventional electricity. With the development of wave energy, the cost of wave power generation will be further reduced. From the perspective of price and environmental protection, it is an energy source with great development potential.

Description of drawings

Fig. 1 is a structural schematic diagram of the utility model ocean wave permanent magnet linear generator.

Fig. 2 Schematic diagram of magnetic field distribution of wave permanent magnet linear generator.

Among them: primary core 1; primary three-phase winding 2; air gap 3; secondary core 4; secondary upper right permanent magnet 5; secondary upper left permanent magnet 6; secondary non-magnetic material 7; secondary lower right permanent magnet 8; Secondary lower left permanent magnet 9.

Detailed ways

Fig. 1 is an improved wave permanent magnet linear generator, which includes a primary core 1, a secondary mover and an air gap 3, the primary core 1 is located on both sides of the generator, and the secondary mover is located in the middle of the primary core 1, There is an air gap 3 between the primary core 1 and the secondary mover; a primary three-phase winding 2 is provided inside the primary core 1; the secondary mover includes a secondary core 4, a secondary upper right permanent magnet 5, and a secondary upper left permanent magnet. Magnet 6, secondary non-magnetic material 7, secondary lower right permanent magnet 8, secondary lower left permanent magnet 9; secondary upper right permanent magnet 5 and secondary lower right permanent magnet 8, secondary upper left permanent magnet 6 and secondary The lower left permanent magnets 9 respectively form a pair of poles and are respectively located outside the secondary core 4 , and the magnetic routes on both sides are separated by the secondary non-magnetic material 7 .

The secondary right upper permanent magnet 5 and the secondary left upper permanent magnet 6 have the same polarity, the secondary right lower permanent magnet 8 and the secondary left lower permanent magnet 9 have the same polarity, and the secondary right upper permanent magnet 5 is the same as the secondary right permanent magnet. The polarity of the lower permanent magnet 8 is opposite, so that the electromagnetic force in the parallel direction that both sides are initially subjected to in this layout is equal, and the air gaps on both sides are equal.

Figure 2 is the magnetic field distribution of the wave permanent magnet linear generator. It can be seen from the figure that the magnets on both sides are relatively independent.

Neglecting the influence of the primary cogging, the excitation magnetic field provided by the secondary permanent magnet generates a sine wave air-gap magnetic field in the air gaps on both sides respectively. When the waves drive the secondary mover to move, the magnetic field of the mover cuts in the stator winding, generating an induced electromotive force. There is an air gap of 0.5-1 cm between primary and secondary.

a. The primary iron core of the linear motor is composed of silicon steel sheets, and the manufacturing process is the same as that of ordinary linear motors.

b. The permanent magnet is composed of rare earth permanent magnet NdFeB, and the magnetization directions between the adjacent ones on the same side are opposite, forming an N and S structure.

c. The secondary magnetic pole of the linear motor is directly connected to the wave energy converter. The change of the wave amplitude causes the pressure in the converter to change, and this pressure change drives the linear motor to move up and down.

d. When there is no sea wave, the secondary magnetic pole does not move. At this time, there is a static magnetic field between the air gap of the linear motor, and no electromotive force will be induced in the stator winding. When the waves come, the secondary magnetic poles are not moved and are driven by the waves, and an induced voltage will be generated in the stator winding of the linear motor. When the external circuit is closed, the linear motor will transmit electric energy to the external circuit.

e. At this time, due to the irregular amplitude and wave frequency of the wave movement, the amplitude and frequency of the generated electric energy are also irregular, so it is necessary to apply the variable current technology to improve the quality of wave power generation.

Claims (3)

1. wave permanent magnet linear generator, it is characterized in that this generator comprises elementary iron core (1), secondary mover and air gap (3), elementary iron core (1) is positioned at the both sides of generator, secondary mover is positioned at the centre of elementary iron core (1), is provided with air gap (3) between elementary iron core (1) and the secondary mover; Be provided with elementary three phase windings (2) in elementary iron core (1) inboard; Secondary mover comprises secondary iron core (4), secondary upper right permanent magnet (5), secondary upper left permanent magnet (6), secondary non-magnet material (7), secondary bottom right permanent magnet (8), secondary lower-left permanent magnet (9); Secondary upper right permanent magnet (5) and secondary bottom right permanent magnet (8), secondary upper left permanent magnet (6) and secondary lower-left permanent magnet (9) utmost point that partners respectively, and lay respectively at secondary iron core (4) outside, the magnetic circuit on both sides is separated by secondary non-magnet material (7).

2. wave permanent magnet linear generator as claimed in claim 1, it is characterized in that secondary upper right permanent magnet (5), secondary upper left permanent magnet (6) have identical polarity, secondary bottom right permanent magnet (8), secondary lower-left permanent magnet (9) have identical polarity, and secondary upper right permanent magnet (5) is opposite with secondary bottom right permanent magnet (8) polarity, layout makes the electromagnetic force of the parallel direction that the electric mover both sides are subjected to equate that the air gap on both sides equates like this.

3. wave permanent magnet linear generator as claimed in claim 1 is characterized in that elementary and inferior inter-stage has 0.5-1 centimetre air gap (3).

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