Wide-range high-adaptability motor tuning device

Abstract

The invention provides a wide-range and high-adaptability motor tuning device, and belongs to the technical field of motor tuning equipment. Two annular first permanent magnets are sequentially arranged on the inner side surface of a mast from top to bottom and serve as a mover part of a bladeless wind driven generator; two second permanent magnets corresponding to the first permanent magnets are sequentially arranged on the stator bracket from top to bottom; when the mast swings, the first permanent magnet moves along with the mast, the second permanent magnet is kept static, and at the moment, the repulsive force between the first permanent magnet and the second permanent magnet is inversely proportional to the square of the distance between the first permanent magnet and the second permanent magnet; when the wind speed is increased, the oscillation amplitude of the mast tends to be increased, so that the distance between the first permanent magnet and the second permanent magnet is smaller and smaller when the first permanent magnet and the second permanent magnet are closest to each other, and the maximum repulsive force generated between the first permanent magnet and the second permanent magnet in each oscillation period is correspondingly increased; when the wind speed is increased, the increase of the repulsive force improves the inherent frequency of the blade-free wind driven generator.

Description

Technical Field

[0001] The invention relates to the technical field of motor tuning equipment, and in particular to a motor tuning device with wide range and strong adaptability. Background Art

[0002] Compared with horizontal axis wind turbines and vertical axis wind turbines, bladeless wind turbines have a special shape and power generation method. Unlike the previous method of relying on turbine rotation to generate electricity, the working principle of its power generation is vortex shedding. In aeroelastic mechanics, when the natural frequency of the bladeless wind turbine is the same as the frequency of vortex shedding, the mast will begin to vibrate, which is called vortex-induced vibration. Therefore, without the contact of moving parts, bladeless wind turbines can realize the conversion of mechanical energy into electrical energy. As a new third-generation wind turbine, due to the elimination of huge blades, bladeless wind turbines save more materials and have a simpler structure, which can effectively reduce construction costs and installation space, and increase the number of motors installed per unit area.

[0003] At present, under the complex external conditions of non-constant external wind speed and strong wind, the matching mechanism between the single natural frequency of the mast and the large-scale non-constant external wind speed has not been fully revealed, which makes it difficult for bladeless wind turbines to generate electricity continuously and stably, and it is difficult to support the electricity demand of the user end and the energy storage end. In addition, since the mass and size of the mast determine the size of the natural frequency, and the mast is in a state of continuous reciprocating vibration, when using a traditional control system, it is necessary not only to reasonably design the installation position of the device, but also to consider the precision, maintenance and economy of the device, resulting in large application limitations of this method. The fundamental reason for the above problems is that there is a lack of a tuning system that does not require an auxiliary control system to passively adjust the natural frequency of the bladeless wind turbine according to the degree of mast bending.

[0004] Bladeless wind turbines operate based on the principle of vortex shedding, so the operating state of bladeless wind turbines depends on the external wind speed. The unstable wind speed causes its swing amplitude to vary. On the other hand, since the natural frequency of the original structure is single, the acceptable wind speed range of bladeless wind turbines is narrow, and the number of working hours per year is insufficient. In addition, bladeless wind turbines cannot brake quickly in strong winds and earthquakes, which reduces the service life of the mast and makes the maintenance cost of the mast high.

[0005] Therefore, an automatic tuning device is needed to change the structural stiffness of the bladeless wind turbine without the need for a mechanical transmission device and an auxiliary control system, accurately increase the locking range, achieve rapid braking, reduce the maintenance of the mast, and achieve stable operation of the bladeless wind turbine under non-constant wind speeds. Summary of the invention

[0006] The object of the present invention is to provide a motor tuning device with wide range and strong adaptability to solve at least one technical problem existing in the above-mentioned background technology.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] The present invention provides a motor tuning device with wide range and strong adaptability, comprising a base, which is connected to the ground and is fixed; a mast is connected to the base, and the mast is a hollow structure; a stator bracket is connected to the base and is located inside the mast; two annular first permanent magnets are arranged in sequence from top to bottom on the inner surface of the mast as the mover part of the bladeless wind turbine; two second permanent magnets corresponding to the first permanent magnets are arranged in sequence from top to bottom on the stator bracket; when the mast swings, the first permanent magnet moves accordingly, and the second permanent magnet remains stationary, at this time, the repulsive force between the first permanent magnet and the second permanent magnet is inversely proportional to the square of the distance between the two; when the wind speed increases, the amplitude of the mast oscillation tends to increase, so the distance between the first permanent magnet and the second permanent magnet when they are closest becomes smaller and smaller, so the maximum repulsive force generated between the two in each oscillation cycle increases accordingly; when the wind speed increases, the increase in the repulsive force also increases the natural frequency of the bladeless wind turbine, and vice versa.

[0009] Furthermore, it also includes a piezoelectric acceleration sensor, which is installed on the surface of the inner layer of the mast and is used for vibration detection and vibration analysis; when the mast vibrates, due to the piezoelectric effect of the piezoelectric sheet, a voltage signal proportional to the force / acceleration is generated, and the voltage signal is corrected to a standard signal through a charge amplifier and a dynamic signal analyzer, and finally sent to a data acquisition device for display or recording.

[0010] Beneficial effects of the present invention: The device is an automatic tuning device in a bladeless wind turbine that does not require an auxiliary control system, which avoids the problem of low power generation efficiency caused by excessive amplitude during the swinging of the bladeless wind turbine. It can improve the locking range of the bladeless wind turbine, accurately improve the working wind speed range of the bladeless wind turbine, increase the working time of the bladeless wind turbine, and realize the emergency braking function of the bladeless wind turbine in response to strong winds. The operating principle of the device is the magnetic field effect between the permanent magnetic rings themselves, and no external power supply is required. At the same time, it also avoids the technical bottlenecks caused by mechanical transmission devices and auxiliary control systems.

[0011] 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

[0012] 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.

[0013] Figure 1 This is a topological diagram of the bladeless wind turbine tuning system described in an embodiment of the present invention.

[0014] Figure 2 This is a cross-sectional structural diagram of a bladeless wind turbine tuning system according to an embodiment of the present invention.

[0015] Among them: 1-mast; 2-stator bracket; 3-first permanent magnet; 4-second permanent magnet. DETAILED DESCRIPTION

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] In order to establish a bladeless wind turbine tuning system without mechanical contact based on the principle of low maintenance and strong practicality, so that the bladeless wind turbine can accurately and quickly respond to changing wind speeds, achieve rapid emergency braking under strong winds, and realize the shock absorption protection function under earthquake conditions, so as to provide scientific support for increasing the power generation of bladeless wind turbines and broadening their application range. The present invention provides a wide range of highly adaptable motor tuning devices, which uses the original permanent magnetic rings of bladeless wind turbines as one of the component structures, based on the repulsion and attraction between the permanent magnetic rings themselves, and automatically changes the natural frequency of the equipment according to the speed of the external wind, so as to overcome the limitations of the non-constant wind speed, strong wind and earthquake on the operation stability during the actual operation, increase the working time, and improve the power generation. Due to the simple structure, there is no mechanical friction, no complex auxiliary control system is required, and the vibration and instability caused by mechanical transmission devices such as bearings and couplings in the traditional tuning system are also avoided.

[0027] This device can increase the natural frequency of the bladeless wind turbine according to the degree of bending of the mast. It is mainly used to increase the locking range of the bladeless wind turbine, ensure that the generator still has stable power generation performance under variable wind speeds, and achieve emergency rapid braking under strong winds. This equipment can not only simplify the complex mechanism of changing the natural frequency of the bladeless wind turbine and improve the anti-interference ability of the bladeless wind turbine, but also reduce the maintenance of the mast and overcome the limitations of traditional auxiliary control systems. The device of the present invention has the characteristics of wide range and strong adaptability. It can be applied to bladeless wind turbines, bridge engineering and construction engineering fields, optimize wind power generation efficiency and improve structural safety levels, and promote technological innovation and industrial upgrading in multiple fields with low cost and high efficiency.

[0028] like Figure 1 , Figure 2 As shown, this embodiment provides a motor tuning device with wide range and strong adaptability, including a base, which is connected to the ground and is fixed; a mast 1 is connected to the base, and the mast 1 is a hollow structure; a stator bracket 2 is connected to the base and is located inside the mast 1; two annular first permanent magnets 3 are arranged in sequence from top to bottom on the inner surface of the mast 1 as the rotor part of the bladeless wind turbine; two second permanent magnets 4 corresponding to the first permanent magnet 3 are arranged in sequence from top to bottom on the stator bracket 2; when the mast 1 swings, the first permanent magnet 3 moves accordingly, and the second permanent magnet 4 remains stationary. At this time, the repulsive force between the first permanent magnet 3 and the second permanent magnet 4 is inversely proportional to the square of the distance between the two; when the wind speed increases, the amplitude of the oscillation of the mast 1 tends to increase, so the distance between the first permanent magnet 3 and the second permanent magnet 4 when they are closest becomes smaller and smaller, so the maximum repulsive force generated between the two in each oscillation cycle increases accordingly; when the wind speed increases, the increase in the repulsive force increases the natural frequency of the bladeless wind turbine.

[0029] Specifically, the mast is made of glass fiber and carbon fiber reinforced polymer, has excellent fatigue resistance, and has minimal energy leakage during oscillation. The mast has excellent rigidity and vibration capacity, and interacts with the moving fluid during oscillation motion. Through oscillation, the mast oscillates in the wind, and based on the aerodynamic effect of vortex shedding, it assists the bladeless wind turbine to achieve the conversion of mechanical energy into electrical energy without contact with moving parts. The base is connected to the ground and fixed to ensure that the parts connected to it remain stationary under the action of external wind. The stator bracket is connected to the base and is used to fix the parts that need to be stationary. The first permanent magnet 3 is installed on the inner surface of the mast and is the moving part of the bladeless wind turbine. The second permanent magnet is installed on the stator bracket. The two of them are the main components of the tuning system. For example, a magnetic ring or a single magnet arranged in a ring shape is coaxially arranged so that the magnets are in a state of mutual repulsion. When the mast swings, the first permanent magnet moves with it, and the second permanent magnet remains stationary. At this time, the repulsive force between the first permanent magnet and the second permanent magnet is inversely proportional to the square of the distance between the two. When the wind speed increases, the amplitude of the mast oscillation tends to increase, so the distance between the first permanent magnet and the second permanent magnet when they are closest is getting smaller and smaller, so the maximum repulsive force generated between the two in each oscillation cycle increases accordingly. When the wind speed increases, the increase in this repulsive force also automatically increases the natural frequency of the bladeless wind turbine, and vice versa. The tuning system also increases the damping of the bladeless wind turbine. Since vortex-induced vibration is sensitive to damping, the increase in damping can effectively shorten the wind speed locking area and achieve rapid braking of the bladeless wind turbine under high-speed external wind. The piezoelectric accelerometer is installed on the surface of the inner layer of the mast for vibration detection and vibration analysis. Detection of vibration acceleration: The piezoelectric accelerometer is fixed to the mast. When the mast vibrates, due to the piezoelectric effect of the piezoelectric sheet, a voltage signal proportional to the force (acceleration) is generated. The voltage signal is corrected to a standard signal by a charge amplifier and a dynamic signal analyzer, and finally sent to a data acquisition device for display or recording.

[0030] In summary, the wide-range and highly adaptable motor tuning device described in the embodiment of the present invention is an automatic tuning device in a bladeless wind turbine that does not require an auxiliary control system, which avoids the problem of low power generation efficiency of the bladeless wind turbine due to excessive amplitude during the swinging process. The device can improve the locking range of the bladeless wind turbine, accurately improve the working wind speed range of the bladeless wind turbine, increase the working time of the bladeless wind turbine, and realize the emergency braking function of the bladeless wind turbine when responding to strong winds. The operating principle of the device is the magnetic field effect between the permanent magnetic rings themselves, and no external power supply is required. At the same time, it also avoids the technical bottlenecks caused by mechanical transmission devices and auxiliary control systems. The device can also be applied to the tuning system of high-frequency reciprocating oscillating devices.

[0031] 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 work 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 motor tuning device with wide range and strong adaptability, comprising a base, the base is connected to the ground and is fixed; a mast (1) is connected to the base, and the mast (1) is a hollow structure; a stator bracket (2) is connected to the base and is located inside the mast (1); the characteristics are: Two annular first permanent magnets (3) are arranged in sequence from top to bottom on the inner surface of the mast (1) as the rotor part of the bladeless wind turbine; two second permanent magnets (4) corresponding to the first permanent magnets (3) are arranged in sequence from top to bottom on the stator bracket (2); when the mast (1) swings, the first permanent magnet (3) moves accordingly, and the second permanent magnet (4) remains stationary, at which time the repulsive force between the first permanent magnet (3) and the second permanent magnet (4) is inversely proportional to the square of the distance between the two; when the wind speed increases, the amplitude of the mast (1) oscillation tends to increase, so the distance between the first permanent magnet (3) and the second permanent magnet (4) when they are closest to each other becomes smaller and smaller, so the maximum repulsive force generated between the two in each oscillation cycle increases accordingly; when the wind speed increases, the increase in the repulsive force increases the natural frequency of the bladeless wind turbine.

2. The wide-range and highly adaptable motor tuning device according to claim 1, characterized in that: It also includes a piezoelectric acceleration sensor, which is installed on the surface of the inner layer of the mast and is used for vibration detection and vibration analysis. When the mast vibrates, due to the piezoelectric effect of the piezoelectric sheet, a voltage signal proportional to the force / acceleration is generated. The voltage signal is corrected to a standard signal through a charge amplifier and a dynamic signal analyzer, and finally sent to a data acquisition device for display or recording.

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