Novel magnetism gathering type efficient blade-free wind driven generator

Abstract

The invention provides a novel magnetism-gathering type efficient blade-free wind driven generator, and belongs to the technical field of wind driven generators, the inner wall of a mast is sequentially connected with an annular first permanent magnet and an annular second permanent magnet from top to bottom, and the first permanent magnet and the second permanent magnet serve as rotors of the generator and are used for generating an air-gap magnetic field; the stator support is sequentially connected with an upper layer stator winding and a lower layer stator winding from top to bottom, and the two layers of stator windings are located between the first permanent magnet and the second permanent magnet. Each layer of stator winding is composed of an inner coil and an outer coil, and the coils are wound in the same direction and are fixed on the stator support. According to the invention, the magnetic flux leakage at the non-air-gap side is reduced while the air-gap magnetic field is increased, a magnetic gathering effect is achieved, the magnetic flux leakage at the non-air-gap side is effectively inhibited, and vibration and noise are reduced; the asymmetric double-layer stator winding realizes the optimal power generation effect by utilizing the energy of an air-gap magnetic field to the maximum extent; the permanent magnet consumption is properly reduced, the motor volume is reduced, and the power density and the output efficiency are improved.

Description

Technical Field

[0001] The invention relates to the technical field of wind generators, and in particular to a magnetically concentrated, high-efficiency, bladeless new wind generator. Background Art

[0002] Wind turbines are the core technology of the wind power industry. The structure of bladeless wind turbines is as follows: Figure 1 As shown in the figure, it utilizes the vortex-induced vibration of a cylindrical mast under the wind field, converts the mechanical energy generated by the vibration into electrical energy output, and realizes the effective use of wind energy. Compared with traditional wind turbines, due to its simple shape and light weight, the material and transportation costs are significantly reduced. Because the design does not involve friction between moving parts, its maintenance costs are also lower. In addition, since there are no blades, it will not make audible noise and will not pose a threat to nearby high-altitude organisms. Therefore, bladeless wind turbines are expected to become the third generation of wind turbines to supplement the existing wind power market. At present, under the constraints of limited air gap length and fixed installation space, the optimization and improvement of the magnetic field distribution and energy capture efficiency of bladeless wind turbines need to be solved, resulting in low generator operation efficiency, low output power, poor power density, weak power generation effect, and large vibration noise, which makes it difficult to meet the power consumption end's demand for power generation and sustainability. As Figure 2 and Figure 3 As shown in the figure, the original rotor adopts a single permanent magnet arrangement structure with radial magnetization. The magnetic field strength at the bottom and top of the magnet is consistent, and the non-air gap side leakage is large. The original stator winding is a single-layer structure, which is difficult to maximize the coupling of the air gap magnetic field. Therefore, the current scheme has technical problems such as large non-air gap side leakage, high harmonic content of air gap magnetic density waveform, poor sinusoidality, and low stator winding energy collection rate, which hinders the practical application and development of bladeless wind turbines. Summary of the invention

[0003] The object of the present invention is to provide a new type of magnetic field-concentrating high-efficiency bladeless wind turbine to solve at least one technical problem existing in the above-mentioned background technology.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] The present invention provides a magnetic field-concentrating high-efficiency bladeless new wind turbine, comprising a base, which is connected to the ground and is fixed; a mast connected to the base, which has a hollow structure; and a stator bracket connected to the base and arranged inside the mast for fixing a stator winding.

[0006] The inner wall of the mast is connected with a first annular permanent magnet and a second annular permanent magnet in sequence from top to bottom, the first permanent magnet and the second permanent magnet are movers of the generator, and are used to generate an air gap magnetic field;

[0007] The stator bracket is connected with an upper stator winding and a lower stator winding in sequence from top to bottom, and the two layers of stator winding are located between the first permanent magnet and the second permanent magnet; each layer of stator winding consists of two inner and outer coils, and each coil has the same winding direction and is fixed on the stator bracket.

[0008] Furthermore, the positions of the boundary lines between the inner coils and the outer coils of the two layers of stator windings correspond to the circles at the middle positions of the ring widths of the first permanent magnet and the second permanent magnet.

[0009] Furthermore, when the mast is swinging, the movement trajectories of the first permanent magnet and the second permanent magnet are different. Taking the working state when the mast swings at the maximum amplitude as the upper limit and the premise that the mover and the mast do not have mechanical contact with the stator winding, the maximum outer diameter and the minimum inner diameter of the two layers of stator winding are determined respectively to maximize the coupling area between the stator winding and the air gap magnetic field, increase the energy collection rate, and improve the output power.

[0010] Furthermore, the first permanent magnet and the second permanent magnet both adopt a Halbach array structure, which reduces the magnetic leakage on the non-air gap side, enhances the magnetic flux density on the air gap side, and suppresses the harmonic content in the air gap magnetic field.

[0011] Furthermore, a first connecting ring and a second connecting ring are respectively connected to the inner wall of the mast from top to bottom, and the first permanent magnet and the second permanent magnet are respectively connected to the first connecting ring and the second connecting ring.

[0012] Furthermore, the stator bracket is provided with a first connection platform and a second connection platform from top to bottom, respectively, the inner coil of the upper stator winding is connected to the first connection platform, and the inner coil of the lower stator winding is connected to the second connection platform.

[0013] The beneficial effects of the present invention are as follows: based on the self-shielding effect of the Halbach permanent magnet array, the magnetic field strengths of adjacent permanent magnets are superimposed on each other, which is beneficial to increasing the magnetic field on the air gap side, increasing the power density, and reducing the energy loss, thereby saving permanent magnet materials and reducing the size of the motor; in addition, the sinusoidality of the air gap magnetic field is effectively improved, and the harmonics of the air gap magnetic density are further suppressed, which can not only reduce the vibration and noise during the operation of the motor, but also improve the quality of electric energy; by utilizing the asymmetric double-layer stator winding structure, the air gap magnetic field energy is reasonably utilized under the limitation of the limited air gap, thereby improving the energy capture efficiency, increasing the power generation, and further optimizing the power generation effect.

[0014] Additional aspects and advantages of the present invention will be given in part in the following description, which will become obvious from the following description, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0016] Figure 1 The figure is a schematic diagram of the overall structure of an original bladeless wind turbine in the prior art.

[0017] Figure 2 The present invention is a structural diagram of the stator and rotor of an original bladeless wind turbine in the prior art.

[0018] Figure 3 The figure is a schematic diagram of the magnetic force line distribution of a single permanent magnet in a bladeless wind turbine in the prior art.

[0019] Figure 4 This is a three-dimensional topological structure diagram of the new type of magnetic-concentrating, high-efficiency bladeless wind turbine described in an embodiment of the present invention.

[0020] Figure 5 It is a structural explosion diagram of the new type of magnetic-concentrating, high-efficiency bladeless wind turbine described in an embodiment of the present invention.

[0021] Figure 6 This is a schematic diagram of the cross-sectional structure of a new type of magnetically concentrated, high-efficiency bladeless generator described in an embodiment of the present invention.

[0022] Figure 7 It is a schematic diagram of the magnetization method of the first permanent magnet of the new type of magnetic-concentrating, high-efficiency, bladeless wind turbine described in an embodiment of the present invention.

[0023] Figure 8 This is a schematic diagram of the magnetization method of the second permanent magnet of the magnetic-concentrating, high-efficiency, bladeless novel wind turbine described in an embodiment of the present invention.

[0024] Fig. 9 It is a schematic diagram of the operating status of the new type of magnetic-concentrating, high-efficiency bladeless wind turbine described in an embodiment of the present invention.

[0025] Among them: 1-mast; 2-stator bracket; 3-first permanent magnet; 4-second permanent magnet; 5-upper stator winding; 6-lower stator winding; 7-inner coil; 8-outer coil; 9-first connecting ring; 10-second connecting ring; 11-first connecting platform; 12-second connecting platform. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below by the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0027] It should be understood by those skilled in the art that unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art to which this invention belongs.

[0028] It should also be understood that terms, such as those defined in commonly used dictionaries, should be understood to have a meaning consistent with that in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless as defined herein.

[0029] Those skilled in the art will appreciate that, unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements and / or groups thereof.

[0030] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0031] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0032] In the description of this specification, the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present technology and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present technology.

[0033] Unless otherwise clearly specified or limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For ordinary technicians in this field, the specific meanings of the above terms in this technology can be understood according to specific circumstances.

[0034] To facilitate understanding of the present invention, the present invention is further explained below with reference to specific embodiments in conjunction with the accompanying drawings, and the specific embodiments do not constitute a limitation on the embodiments of the present invention.

[0035] Those skilled in the art should understand that the drawings are merely schematic diagrams of embodiments, and the components in the drawings are not necessarily necessary for implementing the present invention.

[0036] The magnetic-concentrating, high-efficiency, bladeless new wind turbine provided by the present invention is designed from the two perspectives of magnet structure and winding topology to have a single-sided strong magnetic-concentrating effect and a high energy collection rate, so that the bladeless wind turbine can meet the requirements of high output efficiency and high power density, improve the quality of electric energy, and enhance the application value of the bladeless wind turbine.

[0037] The magnetic-concentrating, high-efficiency, bladeless new wind turbine provided by the present invention can overcome the shortcomings of the original bladeless new wind turbine, and utilize the Halbach permanent magnet arrangement method and the asymmetric double-layer stator winding structure to increase the operating efficiency and power density, and is mainly used to increase the power generation and achieve the power improvement of the bladeless new wind turbine. The generator can not only weaken the harmonic content of the air gap magnetic density, enhance the air gap magnetic density and the sinusoidal degree of the air gap magnetic density, reduce the vibration and noise during the operation of the motor, and save the amount of permanent magnets, but also maximize the use of wind energy, improve the energy capture efficiency, and achieve the best power generation effect. The magnetic-concentrating, high-efficiency, bladeless new wind turbine equipment can be widely used in the future for power supply in remote areas, energy self-sufficiency of urban high-rise buildings, construction of offshore wind farms and construction of microgrids. With its high efficiency, quietness and low maintenance cost, it will lead the green energy transformation and promote sustainable development.

[0038] like Figures 4 to 9As shown, in this embodiment, a new type of high-efficiency bladeless wind turbine with concentrated magnetic field is provided, including a base, which is connected to the ground and is fixed; a mast 1 connected to the base, and the mast 1 adopts a hollow structure; and a stator bracket 2 connected to the base and arranged inside the mast 1 for fixing the stator winding; the inner wall of the mast 1 is connected with a first annular permanent magnet 3 and a second annular permanent magnet 4 in sequence from top to bottom, and the first permanent magnet 3 and the second permanent magnet 4 are the movers of the generator, which are used to generate an air gap magnetic field. The stator bracket 2 is connected with an upper stator winding 5 and a lower stator winding 6 in sequence from top to bottom, and the two layers of stator winding are located between the first permanent magnet 3 and the second permanent magnet 4; each layer of stator winding is composed of two inner and outer coils, and each coil has the same winding direction and is fixed on the stator bracket 2.

[0039] The boundary positions of the inner coil 7 and the outer coil 8 of the two-layer stator winding correspond to the circle at the middle position of the ring width of the first permanent magnet 3 and the second permanent magnet 4. The radius of the circle is the sum of the radius of the small circle of the permanent magnet and half of the ring width.

[0040] When the mast 1 is swinging, the movement trajectories of the first permanent magnet 3 and the second permanent magnet 4 are different. Taking the working state of the mast 1 when it swings at the maximum amplitude as the upper limit and the premise that the mover and the mast 1 do not have mechanical contact with the stator winding, the maximum outer diameter and the minimum inner diameter of the two layers of stator winding are determined respectively to maximize the coupling area between the stator winding and the air gap magnetic field, increase the energy collection rate, and improve the output power.

[0041] The first permanent magnet 3 and the second permanent magnet 4 both adopt the Halbach array structure, which reduces the non-air gap side leakage flux, enhances the air gap side magnetic flux density, and suppresses the harmonic content in the air gap magnetic field. Specifically,

[0042] like Figure 7 , Figure 8 As shown in the figure, ⊙ represents the magnetization direction perpendicular to the plane and leaving the plane, × represents the magnetization direction perpendicular to the plane and entering the plane, and → represents the magnetization direction.

[0043] The inner wall of the mast 1 is connected with a first connecting ring 9 and a second connecting ring 10 from top to bottom, and the first permanent magnet 3 and the second permanent magnet 4 are connected with the first connecting ring 9 and the second connecting ring 10. The stator bracket 2 is provided with a first connecting platform 11 and a second connecting platform 12 from top to bottom, and the inner coil of the upper stator winding 5 is connected with the first connecting platform 11, and the inner coil of the lower stator winding 6 is connected with the second connecting platform 12.

[0044] The first permanent magnet 3 and the second permanent magnet 4 establish a magnetic field in the air gap between them. Figure 6As shown in Figure 1, when the mast is stationary, there is no changing flux in the stator winding, so no induced voltage is generated. Fig. 9 When the oscillating state is shown, the magnetic flux linkage with the inner coil turns of the stator winding will increase, and the magnetic flux linkage with the outer coil turns will decrease, thereby generating an induced voltage. According to Lenz's law, the current flow direction of the inner coil and the outer coil can be obtained as follows: Fig. 9 As shown, the two currents flow in opposite directions. In order to maximize the output power, the inner coil and the outer coil in each layer of stator winding are connected in series in reverse order to ensure that the collected current is the sum of the induced currents in the inner and outer coils.

[0045] In summary, the magnetic-concentrating, high-efficiency, bladeless new wind turbine described in the embodiment of the present invention has a Halbach permanent magnet arrangement method in which the magnetic leakage on the non-air-gap side can be reduced while increasing the air-gap magnetic field, thus having a magnetic-concentrating effect. The magnetic leakage on the non-air-gap side is effectively suppressed, and vibration and noise are reduced. The asymmetric double-layer stator winding in the generator achieves the best power generation effect by maximizing the energy of the air-gap magnetic field. Compared with traditional bladeless wind turbines, the generator can appropriately reduce the amount of permanent magnets used, reduce the size of the motor, and improve the power density and output efficiency.

[0046] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative labor on the basis of the technical solution disclosed in the present invention should be included in the scope of protection of the present invention.

Claims

1. A magnetic field-concentrating high-efficiency bladeless new wind turbine, comprising a base, the base being connected to the ground and being fixed; a mast (1) connected to the base, the mast (1) being of a hollow structure; and a stator bracket (2) connected to the base and arranged inside the mast (1) for fixing a stator winding; characterized in that: An annular first permanent magnet (3) and an annular second permanent magnet (4) are sequentially connected on the inner wall of the mast (1) from top to bottom, and the first permanent magnet (3) and the second permanent magnet (4) are movers of a generator and are used to generate an air gap magnetic field; An upper layer of stator windings (5) and a lower layer of stator windings (6) are sequentially connected to the stator support (2) from top to bottom, and the two layers of stator windings are located between the first permanent magnet (3) and the second permanent magnet (4); each layer of stator windings is composed of two inner and outer coils, each coil having the same winding direction and fixed to the stator support (2).

2. The magnetic field-concentrating high-efficiency bladeless new wind turbine according to claim 1 is characterized in that: The positions of the boundary lines of the inner coil (7) and the outer coil (8) of the two-layer stator winding correspond to the circle at the middle position of the ring width of the first permanent magnet (3) and the second permanent magnet (4).

3. The magnetic field-concentrating high-efficiency bladeless new wind turbine according to claim 2 is characterized in that: When the mast (1) is swinging, the movement trajectories of the first permanent magnet (3) and the second permanent magnet (4) are different. Taking the working state of the mast (1) swinging at the maximum amplitude as the upper limit and the premise that the mover and the mast (1) do not have mechanical contact with the stator winding, the maximum outer diameter and the minimum inner diameter of the two layers of stator winding are determined respectively, so as to maximize the coupling area between the stator winding and the air gap magnetic field, increase the energy collection rate, and improve the output power.

4. The magnetic field-concentrating high-efficiency bladeless new wind turbine according to claim 1 is characterized in that: The first permanent magnet (3) and the second permanent magnet (4) both adopt a Halbach array structure, which reduces magnetic leakage on the non-air gap side, enhances magnetic flux density on the air gap side, and suppresses harmonic content in the air gap magnetic field.

5. The magnetic field-concentrating high-efficiency bladeless new wind turbine according to claim 1 is characterized in that: A first connecting ring (9) and a second connecting ring (10) are respectively connected to the inner wall of the mast (1) from top to bottom, and the first permanent magnet (3) and the second permanent magnet (4) are respectively connected to the first connecting ring (9) and the second connecting ring (10).

6. The magnetic field-concentrating high-efficiency bladeless new wind turbine according to claim 1 is characterized in that: A first connecting platform (11) and a second connecting platform (12) are respectively provided on the stator support (2) from top to bottom, the inner coil of the upper stator winding (5) is connected to the first connecting platform (11), and the inner coil of the lower stator winding (6) is connected to the second connecting platform (12).

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