CN101660481B - Magnetic gear drive ocean wave linear generator - Google Patents

Abstract

The invention relates to a wave linear generator with magnetic gear transmission, which comprises two structures, both of which are composed of a cylindrical permanent magnet synchronous linear motor and a cylindrical linear magnetic gear. The permanent magnet synchronous linear motor comprises a motor primary and a motor secondary. The motor primary comprises a primary iron core (1) and a primary winding (2). The primary iron core (1) is fixed to the seabed. The primary winding is embedded in a wire slot of the primary iron core. The motor secondary comprises a permanent magnet (3). The magnetic gear comprises a high-speed side (3), an intermediate magnetic adjustment ring (4), a low-speed side (5) and an iron core (6). The high-speed side of the magnetic gear is the secondary (3) of the permanent magnet synchronous linear motor. The magnetic adjustment ring (4) in the middle is fixed to the seabed. The low-speed side of the magnetic gear comprises a permanent magnet (5) and an iron core (6) and is connected to a buoy (8) floating on the sea surface (9). An air gap (10) is provided between the primary (1) and the secondary (3) of the linear motor. An air gap (11) is provided between the secondary (3) of the linear motor and the magnetic adjustment ring (4) of the magnetic gear. An air gap (12) is provided between the magnetic adjustment ring (4) and the low-speed side (5) of the magnetic gear.

Description

Magnetic gear drive ocean wave linear generator

technical field

The invention relates to an ocean wave linear generator driven by a magnetic gear, in particular to a cylindrical permanent magnet linear synchronous generator applied to ocean wave power generation. The invention relates to the fields of electrician and motor.

Background technique

The global population continues to expand, and energy and environmental problems are becoming more and more serious. People have to find new energy sources to solve the current crisis. The ocean area accounts for about 70% of the global surface area, and ocean energy is one of the most abundant energy reserves on the earth. Ocean energy refers to the renewable energy attached to seawater, which stores and exchanges energy through various forms such as tides and waves. After nearly 40 years of research, scholars at home and abroad have proposed a variety of wave power generation methods, but most of them use various mechanical devices to convert the reciprocating linear motion of waves into rotary motion, and then convert energy by rotating motors. In recent years, some scholars It is proposed to use a linear motor to directly convert the linear motion of ocean waves into electrical energy without any intermediate conversion mechanism, and the efficiency can be improved. However, regardless of whether a rotary motor or a linear motor is used, due to the slow motion of the waves, the volume and mass of the generator are generally large, and the manufacturing cost is relatively high. Reduced system efficiency, need for regular maintenance and other issues. The use of magnetic gear transmission can not only solve the contradiction between the wave motion speed and the volume of the generator, but also avoid the loss and heat caused by the direct contact of the traditional gearbox. It does not need lubrication, no mechanical wear, no noise, and has a large Good anti-overload ability can effectively reduce the damage caused by strong wind and waves to the system.

Contents of the invention

Technical problem: The present invention is designed for the deficiencies of the existing technology, the purpose is to reduce the operating loss of the wave power generation system, improve the system efficiency, combined with the characteristics of the wave reciprocating linear motion and slow motion speed, a magnetic gear transmission cylinder is proposed Type permanent magnet synchronous linear generator, used in wave power generation.

Technical solution: The wave generator driven by magnetic gears of the present invention is used to generate electricity from sea waves off the coast. The low-speed side of the magnetic gear is driven by the buoy using the undulating motion of the waves, and the secondary side of the linear generator is driven by the magnetic gear to increase the low-speed power provided by the waves. Linear reciprocating speed. The primary and winding of the linear motor are fixed on the seabed, and the secondary permanent magnet of the linear motor cuts the primary winding in a static state when it reciprocates, generating an induced electromotive force. Since the frequency and speed of sea waves are not constant, the present invention converts the generated electromotive force into a power frequency through a converter, so that the electric energy can be transmitted to the power grid or directly used by electrical appliances.

The generator includes a cylindrical permanent magnet synchronous linear motor and a cylindrical linear magnetic gear. The permanent magnet synchronous linear motor includes a motor primary and a motor secondary. The motor primary includes a primary iron core and a primary winding. The primary iron core is fixed On the seabed, the primary winding is embedded in the slot of the primary iron core; the secondary side of the motor includes the high-speed side; the linear magnetic gear includes the high-speed side, the intermediate magnetic ring, the low-speed side and the iron core, and the high-speed side and the low-speed side are both permanent magnets. There is a low-speed side on the outer side of the iron core, an intermediate magnetic ring is provided on the outer side of the low-speed side, a high-speed side is arranged on the outer side of the intermediate magnetic ring, and a primary iron core is arranged on the outer side of the high-speed side, and the intermediate magnetic ring is fixed on the seabed; The side is connected with the buoy, and the buoy floats on the sea surface; there is a first air gap between the primary iron core and the high-speed side; a second air gap is set between the high-speed side and the intermediate magnetic ring; third air gap.

The high-speed side and the low-speed side are respectively rings made of a plurality of radially magnetized permanent magnet materials, arranged in sequence along the axial direction to form a cylindrical shape, and two adjacent radially magnetized permanent magnet materials are made of The magnetization direction of the ring is opposite, so that the magnetic field is distributed sinusoidally along the axis.

The intermediate modulation magnetic ring is made of ferromagnetic material and non-magnetic material and arranged at intervals along the axial direction to form a cylindrical shape.

Beneficial effects: the wave linear generator driven by magnetic gears has the following beneficial effects:

1) Ocean wave energy is a recyclable and clean energy source, and the present invention does not produce pollution and noise;

2) Replacing the traditional rotary motor with a linear motor, the part that converts the reciprocating linear motion of the ocean wave into a rotary motion is omitted, with a simple, compact structure and high power density;

3) The movement speed of the low-speed side of the magnetic gear is accelerated by the magnetic gear to reduce the volume of the generator, avoiding the loss and heat caused by the direct contact of the traditional gearbox transmission, no lubrication, no mechanical wear, no noise, and has a very Good anti-overload ability can effectively reduce the damage caused by strong wind and waves to the system.

4) The system has compact structure and high power density.

5) The rare earth permanent magnet NdFeB is used, and the air gap magnetic field is modulated by the magnetic adjustment ring, so the thrust density is high.

Description of drawings

Figure 1 is one of the wave generators driven by magnetic gears - low speed inside and high speed outside (structure 1)

Figure 2 is the second wave generator with magnetic gear transmission - the outer low speed and inner high speed structure (structure 2)

In the figure there are: primary iron core 1, primary winding 2, high speed side 3, intermediate magnetic ring 4, low speed side 5, iron core 6, coupling shaft 7, buoy 8, sea surface 9, first air gap 10, second air gap 11 , the third air gap 12

Detailed ways

The first structure:

The wave linear generator driven by a magnetic gear of the present invention comprises a cylindrical permanent magnet synchronous linear motor and a cylindrical linear magnetic gear. The permanent magnet synchronous linear motor includes a primary motor and a secondary motor. The primary of the motor includes primary iron core 1 and primary winding 2, the primary winding 2 is embedded in the slot of primary iron core 1, and the primary iron core 1 is fixed on the seabed; the secondary of the motor includes high-speed side 3; the linear magnetic gear includes high-speed side 3, intermediate magnetic ring 4. The low-speed side 5 and the iron core 6, wherein the high-speed side 3 and the low-speed side 5 are permanent magnets, the low-speed side 5 is provided on the outside of the iron core 6, and the intermediate magnetic ring 4 is provided on the outside of the low-speed side 5. In the middle The outer side of the magnetic adjustment ring 4 is provided with a high-speed side 3, and the outer side of the high-speed side 3 is the primary iron core 1, and the middle magnetic adjustment ring 4 is fixed on the seabed; the low-speed side 5 is connected with the buoy 8, and the buoy 8 floats on the sea surface 9; the primary iron core There is a first air gap 10 between 1 and the high-speed side 3; a second air gap 11 is set between the high-speed side 3 and the intermediate magnetic ring 4; a third air gap 12 is provided between the intermediate magnetic ring 4 and the low-speed side 5 .

The second structure has no iron core 6 and connecting shaft 7 parts.

The primary iron core 1 is made of ordinary silicon steel sheet material, which is the same as the manufacturing process of ordinary linear motors.

The primary winding 2 adopts a distributed winding to reduce the harmonic component of the induced electromotive force.

The secondary, that is, the high-speed side 3 of the magnetic gear is a ring made of radially magnetized rare earth permanent magnet NdFeB material, arranged in sequence along the axial direction to form a cylindrical shape, and the magnetization of two adjacent permanent magnet rings The direction is opposite, so that the magnetic field is distributed sinusoidally along the axis.

Said magnetic gear intermediate magnetic adjustment ring 4 is made of ferromagnetic material and non-magnetic material, and the rings are arranged at intervals along the axial direction, forming a cylindrical shape.

The low-speed side 5 of the magnetic gear is made of a ring made of radially magnetized rare earth permanent magnet NdFeB material, arranged in sequence along the axial direction to form a cylindrical shape, and the magnetization directions of two adjacent permanent magnet rings are opposite, so that The magnetic field is distributed sinusoidally along the axis.

In the first structure, the linear motor primary core 1 and primary winding 2 are outside the generator, and the magnetic gear is inside, which is a low-speed inside and high-speed outside structure. The primary of the motor and the magnetic gear adjusting ring are fixed on the seabed, and the middle iron core 6 on the low-speed side of the magnetic gear is made of ferromagnetic material. It is connected with the buoy 8 through the connecting rod 7 to input mechanical energy. The speed is increased by the magnetic gear, the secondary of the linear motor makes a linear reciprocating motion, and the permanent magnet cuts the primary winding 2 to generate an induced electromotive force.

In the second structure, the linear motor primary core 1 and primary winding 2 are inside the generator, and the magnetic gear is outside, which is a low-speed outside and high-speed inside structure. The primary motor and the magnetic gear adjusting ring are fixed on the seabed and are stationary, and the low-speed side 5 of the magnetic gear is directly installed in the buoy 8 to form a whole and input mechanical energy. The speed is increased by the magnetic gear, the secondary of the linear motor makes a linear reciprocating motion, and the permanent magnet cuts the primary winding 2 to generate an induced electromotive force.

Claims (4)

1. A wave linear generator driven by a magnetic gear is characterized in that the generator comprises a cylindrical permanent magnet synchronous linear motor and a cylindrical linear magnetic gear, and the permanent magnet synchronous linear motor comprises a motor primary, a motor Secondary, the motor primary includes primary iron core (1), primary winding (2), primary winding (2) embedded in the slot of primary iron core (1), primary iron core (1) is fixed on the seabed; motor secondary includes high-speed side (3); The linear magnetic gear includes a high-speed side (3), an intermediate magnetic ring (4), a low-speed side (5) and an iron core (6), wherein the high-speed side (3) and the low-speed side (5) are permanent magnets A low-speed side (5) is provided on the outside of the iron core (6), an intermediate magnetic ring (4) is provided on the external side of the low-speed side (5), and a high-speed side (3) is provided on the external side of the intermediate magnetic ring (4). ), the outer side of the high-speed side (3) is the primary iron core (1), and the intermediate magnetic ring (4) is fixed on the seabed; the low-speed side (5) is connected with the buoy (8), and the buoy (8) floats on the sea surface (9) Above; a first air gap (10) is set between the primary core (1) and the high-speed side (3); a second air gap (11) is set between the high-speed side (3) and the intermediate magnetic ring (4); The intermediate modulation magnetic ring (4) and the low-speed side (5) are provided with a third air gap (12); the high-speed side (3) and the low-speed side (5) are respectively made of a plurality of radially magnetized permanent magnet materials The rings made are arranged in sequence along the axial direction to form a cylindrical shape, and the magnetization directions of two adjacent rings made of radially magnetized permanent magnet materials are opposite, so that the magnetic field is distributed sinusoidally along the axial direction. 2. The ocean wave linear generator driven by magnetic gears according to claim 1, characterized in that a permanent magnet synchronous linear motor and a linear magnetic gear are integrated to generate electricity by utilizing the undulation of ocean waves. 3. The ocean wave linear generator driven by magnetic gear according to claim 1, characterized in that the low-speed side of the magnetic gear is connected with the buoy (8), input ocean wave energy, and improves the secondary (3) of the permanent magnet synchronous linear motor through the magnetic gear. speed of movement. 4. The ocean wave linear generator driven by magnetic gears according to claim 1, characterized in that the intermediate magnetic adjustment ring (4) is made of ferromagnetic material and non-magnetic material at intervals to form a cylindrical shape.

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