阅读说明：本技术 一种直驱式波浪发电用永磁直线发电机 (Direct-drive permanent magnet linear generator for wave power generation ) 是由 范新宇 殷杰 王长坤 于 2020-11-13 设计创作，主要内容包括：本发明公开一种直驱式波浪发电用永磁直线发电机,包括定子结构和动子结构,还包括浮筒,动子结构固定在浮筒内部,随着浮筒做上下往复运动,所述动子结构内部设有腔体,定子结构设置在所述腔体内,所述永磁体部分的排布采用Halbach阵列。外壳固定于浮筒内壁上,跟随波浪起伏带动直线发电机动子结构上下往复运动,使处于静止状态的定子结构中的线圈绕组切割磁场线,从而产生感应电动势。本发明的永磁直线发电机具有结构简单紧凑,体积小重量轻,功率密度高,发电效率高等优势。(The invention discloses a direct-drive permanent magnet linear generator for wave power generation, which comprises a stator structure, a rotor structure and a buoy, wherein the rotor structure is fixed in the buoy and reciprocates up and down along with the buoy, a cavity is arranged in the rotor structure, the stator structure is arranged in the cavity, and the arrangement of the permanent magnet part adopts a Halbach array. The shell is fixed on the inner wall of the float bowl and drives the rotor structure of the linear generator to reciprocate up and down along with the fluctuation of waves, so that the coil winding in the stator structure in a static state cuts a magnetic field line, and induced electromotive force is generated. The permanent magnet linear generator has the advantages of simple and compact structure, small volume, light weight, high power density, high generating efficiency and the like.)

1. The utility model provides a direct drive formula permanent magnet linear generator for wave power generation, includes stator structure and active cell structure, its characterized in that still includes flotation pontoon (4), and the active cell structure is fixed inside flotation pontoon (4), and reciprocating motion about being along with flotation pontoon (4), the inside cavity that is equipped with of active cell structure, stator structure sets up in the cavity, forms air gap (10) between stator structure and the active cell structure.

2. The direct drive type permanent magnet linear generator for wave power generation as claimed in claim 1, wherein the stator structure comprises a stator core (8), a stator shaft (12), a shaft sleeve (1) and a coil winding (7), a plurality of annular grooves are arranged on the outer circumference of the stator core (8), the coil winding (7) is placed in each annular groove, a shaft hole penetrates through the center of the stator core (8), the stator shaft (12) is fixed in the shaft hole of the stator core (8), and the shaft sleeves (1) are fixed at two ends of the stator shaft (12).

3. The permanent magnet linear generator for direct drive type wave power generation as claimed in claim 2, wherein the rotor structure comprises an upper end cover (3), a lower end cover (11), a sliding bearing (2) and a permanent magnet part (6), the permanent magnet part (6) is installed on the inner side wall surface of the housing (5), the upper end and the lower end of the housing (5) are respectively installed on the upper end cover (3) and the lower end cover (11), the sliding bearing (2) is fixed in the axial through hole at the center of the upper end cover (3) and the lower end cover (11), the stator shaft (12) respectively passes through and is supported by the two sliding bearings (2), the shaft sleeve (1) fixed on the stator shaft (12) is connected with the sliding bearing (2), and the housing (5) is fixed inside the buoy (4).

4. A direct drive permanent magnet linear generator for wave power generation according to claim 3, characterized in that a return spring (9) is installed between the upper end cover (3), the lower end cover (11) and the stator core (8).

5. The direct-drive permanent magnet linear generator for wave power generation according to claim 4, wherein the stator core (8) is formed by stacking silicon steel sheets, the stator shaft (12) is made of non-magnetic conducting materials, and the shell (5) is made of soft magnetic materials.

6. A direct drive permanent magnet linear generator for wave power generation according to claim 5, characterized in that the stator structure, the mover structure and the housing (5) are cylindrical.

7. A direct drive permanent magnet linear generator for wave power generation according to claim 6, characterized in that adjacent coil windings (7) in the annular groove are wound in opposite directions and connected in series.

8. A direct drive permanent magnet linear generator for wave power generation according to claim 7, characterized in that the arrangement of the permanent magnet part (6) is a Halbach array.

Technical Field

The invention belongs to the technical field of linear generators, and particularly relates to a direct-drive permanent magnet linear generator for wave power generation.

Background

Ocean wave energy is inexhaustible as a clean and pollution-free renewable energy source, and the problems of energy crisis, environmental pollution and the like in the current society can be effectively relieved by developing and utilizing the wave energy. At present, the common wave energy power generation system mostly depends on an intermediate transmission device to convert the fluctuation linear motion of waves into rotary motion, and further adopts a rotary motor to realize energy conversion. The existence of the intermediate conversion device causes the low energy conversion efficiency of the power generation system, and the problems of complex structure, high manufacturing and maintenance cost and the like are faced, so that the development of the wave power generation technology is restricted.

The direct-drive wave power generation device can effectively solve the problems, and the fluctuation linear motion of waves is directly converted into electric energy to be output by adopting the linear generator, so that an intermediate transmission link is eliminated, and the energy conversion efficiency is improved. However, the existing linear generator for direct-drive wave power generation generally has the technical problems of large volume, low power density, difficulty in control and the like, and the mechanism performance needs to be further improved.

Disclosure of Invention

Aiming at the defects of large volume, low power density, difficult control and the like of the conventional linear generator, the invention provides the permanent magnet linear generator for the direct drive type wave power generation, which adopts the outer permanent magnet part as a rotor to be directly connected with a buoy, so that the system has simple structure and reduced volume and weight; and the permanent magnet part adopts an array mode with a magnetic gathering effect, so that the power density of the linear generator is effectively improved.

In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a direct drive formula permanent magnet linear generator for wave power generation, includes stator structure and active cell structure, its characterized in that still includes the flotation pontoon, and the active cell structure is fixed inside the flotation pontoon, and reciprocating motion about being along with the flotation pontoon, the inside cavity that is equipped with of active cell structure, stator structure sets up in the cavity, form the air gap between stator structure and the active cell structure.

The improved stator structure comprises a stator core, a stator shaft, shaft sleeves and coil windings, wherein a plurality of annular grooves are formed in the outer circumference of the stator core, the coil windings are arranged in each annular groove, a shaft hole penetrates through the center of the stator core, the stator shaft is fixed in the shaft holes of the stator core, and the shaft sleeves are fixed at two ends of the stator shaft.

The rotor structure comprises an upper end cover, a lower end cover, a sliding bearing and a permanent magnet part, wherein the permanent magnet part is arranged on the inner side wall surface of a shell, the upper end and the lower end of the shell are respectively arranged on the upper end cover and the lower end cover, the sliding bearing is fixed in an axial through hole in the centers of the upper end cover and the lower end cover, a stator shaft respectively penetrates through and is supported by the two sliding bearings, a shaft sleeve fixed on the stator shaft is connected with the sliding bearing, and the shell is fixed inside a buoy.

The further improvement lies in that a return spring is arranged among the upper end cover, the lower end cover and the stator core.

The further improvement lies in that stator core adopts the silicon steel sheet to pile up and forms, and the stator axle adopts non-magnetic material, and the shell material is soft magnetic material.

The further improvement is that the stator structure, the rotor structure and the shell are all cylindrical.

The further improvement is that adjacent coil windings in the annular groove are wound oppositely and connected together in series.

The further improvement is that the arrangement of the permanent magnet part adopts a Halbach array.

Compared with the prior art, the invention has the following remarkable advantages:

firstly, a rotor structure of the linear generator is directly connected with a buoy, an intermediate transmission link is omitted, and energy conversion efficiency is improved; secondly, the permanent magnet part in the rotor structure of the linear generator adopts an array mode with a magnetism gathering effect, so that the power density of the generator is improved; thirdly, the linear generator is simple and compact in structure, small in size and light in weight, and is convenient to produce, manufacture and maintain in later period.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic perspective cross-sectional view of the present invention.

The stator comprises a shaft sleeve 1, a sliding bearing 2, an upper end cover 3, a buoy 4, a shell 5, a permanent magnet part 6, a coil winding 7, a stator iron core 8, a return spring 9, an air gap 10, a lower end cover 11 and a stator shaft 12.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely illustrative of some, but not all, of the presently preferred embodiments of the invention, and that the present invention is best described in the specification. This invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present disclosure is set forth in order to provide a more thorough understanding thereof. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In an embodiment, referring to fig. 1-2, a direct drive type permanent magnet linear generator for wave power generation comprises a linear generator stator structure, a rotor structure and a buoy 4, wherein the linear generator stator structure comprises a stator core 8, a stator shaft 12 and coil windings 7, a plurality of annular grooves are formed in the outer circumference of the stator core 8, a group of coil windings 7 are arranged in each groove, a through shaft hole is formed in the center of the stator core 8, and the stator shaft 12 is a hollow shaft and is fixed with the shaft hole of the stator core 8; an air gap 10 is formed between the stator structure and the rotor structure, the rotor structure of the linear generator comprises an upper end cover 3, a lower end cover 11, a shell 5 and a permanent magnet part 6, the permanent magnet part 6 is arranged on the inner side wall surface of the shell 5, the upper end cover 3 and the lower end cover 11 are respectively arranged at the upper end and the lower end of the shell, a sliding bearing 2 is fixed at the central through hole of the upper end cover 3 and the lower end cover 11, a stator shaft 12 respectively penetrates through and is supported by the two sliding bearings 2, and a shaft sleeve 1 fixed on the stator shaft 12 is directly contacted with the; the outer shell 5 is fixed on the inner wall of the buoy 4; the buoy 4 drives the rotor structure of the linear generator to reciprocate up and down along with the fluctuation of waves, so that the coil winding in the stator structure in a static state cuts magnetic field lines, and induced electromotive force is generated.

The stator iron core 8 is formed by stacking silicon steel sheets so as to reduce eddy current loss in the working process of the generator, and the stator shaft 12 is made of a non-magnetic material so as to reduce magnetic resistance inside the generator. The shell 5 is cylindrical and made of soft magnetic materials and is fixed on the inner wall of the buoy 4. The adjacent coil windings 7 are oppositely wound and connected in series to form a single-phase winding of the linear generator, so that the control difficulty is reduced. And a return spring 9 is arranged between the upper end cover 3, the lower end cover 11 and the stator core 8.

The rotor structure and the stator structure of the linear generator are both cylindrical, so that the side end effect of a common linear motor can be eliminated, and the motor efficiency is improved. The reset spring 9 can provide a counter force to return the mover structure to the middle position when the mover structure is located at the end portion, and simultaneously provides a buffer force to prevent the mover structure from colliding with the stator structure. Furthermore, the permanent magnet part 6 adopts a Halbach array mode with a magnetism gathering effect. The scheme provided by the invention directly converts the fluctuation linear motion of waves into electric energy to be output, cancels an intermediate transmission link and improves the energy conversion efficiency.

The use principle is as follows: the shell 5 of the motor part of the permanent magnet linear generator is fixed on the inner wall of the buoy 4, the fluctuation of waves drives the buoy 4 to do vertical reciprocating linear motion, so that the rotor structure of the linear generator is driven to move, a magnetic field generated by the permanent magnet part 6 changes in space, the coil winding 7 in the stator structure in a static state cuts a magnetic field line, induced electromotive force is generated, the coil winding 7 is externally connected with a load to form a loop, and induced current can be generated in the coil winding 7. According to the requirements of application occasions, the array mode of the permanent magnet part 6 can be changed, and the array mode can be a Halbach array mode, and can also be an axial magnetizing alternate array mode or a radial magnetizing alternate array mode. The number of annular grooves in the stator core 8 can be changed to achieve optimization of the power generation efficiency. The invention provides a permanent magnet linear generator for direct drive type wave power generation, aiming at the defects of large volume, low power density, difficult control and the like of the existing linear generator for direct drive type wave power generation.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing detailed description, or equivalent changes may be made in some of the features of the embodiments described above. All equivalent structures made by using the content of the specification of the invention can be directly or indirectly applied to other related technical fields, and are also within the protection scope of the patent of the invention.