A self-powered wind speed monitoring system
By combining electromagnetic, piezoelectric, and triboelectric transducers, and utilizing wind-driven excitation of an internal magnet to roll and cut magnetic lines of force and alternating contact and separation of reeds to generate electricity, the problem of low power supply capacity and reliability of self-powered wind speed monitoring systems in the field environment is solved, achieving wind speed monitoring with high energy density and strong power generation capacity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ZHEJIANG NORMAL UNIV
- Filing Date
- 2023-04-21
- Publication Date
- 2026-06-16
AI Technical Summary
Existing self-powered wind speed monitoring systems face problems such as low power generation capacity and energy density per unit volume of the power supply unit, limited environmental adaptability, and low reliability in the field. They are particularly difficult to work effectively under low wind speed conditions, and the sensors are easily damaged.
The design incorporates multiple transducers, including electromagnetic, piezoelectric, and triboelectric transducers. It generates electricity by using wind-driven excitation to make the inner magnet roll and cut magnetic lines of force. The alternating contact and separation of the main and auxiliary reeds generate charges, and the stress changes of the piezoelectric film generate electricity, thus achieving an organic combination of multiple energy capture methods.
It improves the energy density and power generation capacity per unit volume, enhances the environmental adaptability and reliability of the system, avoids sensor damage due to high flow rate, makes the dynamic response characteristics easy to adjust, and has a large output voltage and power.
Smart Images
Figure CN116859075B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of environmental monitoring and new energy technology, specifically relating to a self-powered wind speed monitoring system. Background Technology
[0002] Wind direction and speed measurement technology has wide applications in meteorology, civil aviation, highways and bridges, and mining. Currently, significant progress has been made in new sensors, data acquisition, and processing technologies for wind direction and speed measurement, with portable digital anemometers finding widespread practical application in industrial production. Currently, wind direction and speed monitoring systems in natural field environments use either cable laying or battery power. Practical problems encountered in these systems include high cable laying costs, poor mobility of monitoring points, and limited battery power requiring frequent replacement. Therefore, self-powered wind direction and speed measurement devices based on wind energy harvesting have been proposed. From a practical application perspective, existing self-powered wind speed monitoring systems still face many technical bottlenecks, the most common of which are summarized below: The power generation capacity and energy density per unit volume of the power supply unit are relatively low; It has limited environmental adaptability, especially poor adaptability to low wind speeds; Low reliability, for example, piezoelectric ceramics are easily damaged by excessive environmental vibration intensity and amplitude, and sliding friction wind speed monitoring systems are prone to failure due to frictional wear between friction pairs, etc. Summary of the Invention
[0003] This invention proposes a self-powered wind speed monitoring system, comprising a base, an upstream frame, a pressure plate, a blunt body, a downstream frame, a vertical cover, a frequency modulation block, a main spring, a secondary spring, a circuit board, a flat cover, a coil, an inner magnet, an outer magnet, and an anemometer. The anemometer is a commercial product. The circuit board is equipped with an energy harvesting and management unit and an information transmission unit. The circuit board is screwed into the flat cover. The flat cover, the upstream frame, and the downstream frame are screwed onto the base. The upstream frame consists of an upstream frame base and an upstream frame column. The flat cover, the upstream frame base, and the downstream frame base are screwed onto the base. The anemometer is screwed onto the upstream frame column, on the side of the upstream frame column away from the downstream frame. The wind blows from the anemometer towards the downstream frame.
[0004] The blunt body is a closed hollow shell. The blunt body is a cylindrical or polygonal shell surrounded by shell walls. One side of the blunt body is provided with an ear plate, and the other side is inlaid with an external magnet. The two ear plates form a slot. The external magnet is inlaid on the shell wall of the blunt body. The magnetic poles of the external magnet are arranged circumferentially along the cross-section of the blunt body. When the blunt body is a cylindrical shell, the two magnetic poles of the external magnet are located on the tangent of the cylindrical surface and are placed on both sides of the tangent point. The magnetic poles of two axially adjacent external magnets on the blunt body are arranged in the same or opposite directions.
[0005] The downstream frame has a magnet cavity and a coil cavity on one side of the downstream frame plate. The magnet cavity is located inside the coil cavity and is separated from the coil cavity by a wire frame. The magnet cavity and the coil cavity outside it form a cavity group. The minimum number of cavity groups is 1. Multiple cavity groups can be arranged in a column, a row or a matrix. The downstream frame plate is a flat plate, an arc plate or a bent plate. When the downstream frame plate is an arc plate or a bent plate, the cavity group is located on the convex surface of the downstream frame plate, that is, the magnet cavity and the coil cavity are located on one side of the convex surface of the downstream frame plate.
[0006] The upright cover is screwed onto the downstream frame plate and covers the cavity assembly. The coil and the inner magnet are placed in the coil cavity and the magnet cavity, respectively. The inner magnet is a sphere or cylinder, and is radially magnetized. The magnetic poles of the inner magnet are arranged radially, and the inner magnet can roll freely within the magnet cavity. The inner magnet is located inside the coil, and the wire frame separates the inner magnet from the coil. That is, the coil and the inner magnet are installed outside and inside the wire frame, respectively. When the inner magnet is a cylinder, the coil axis is perpendicular to the inner magnet axis, and the inner magnet axis is parallel to the blunt body axis.
[0007] The main reed is an independent metal reed, or the main reed consists of a metal reed and main diaphragms attached to both sides; the secondary reed is an independent metal reed, or the secondary reed consists of a metal reed and a piezoelectric film attached to one side, or the secondary reed consists of a metal reed and piezoelectric films and secondary diaphragms attached to both sides respectively, i.e., the piezoelectric film and secondary diaphragms are respectively attached to both sides of the metal reed; the piezoelectric film is a PVDF film or a PZT film, and the metal reed is made of non-ferromagnetic materials such as copper, copper alloy, nickel alloy, and stainless steel; the triboelectric series of the main diaphragm material and the secondary diaphragm material are far apart, and the main diaphragm and secondary diaphragm materials are non-metallic materials.
[0008] One end of the main reed and the auxiliary reeds on both sides are mounted on the upstream column of the upstream frame via pressure plates and screws. The free end of the main reed is mounted with a blunt body via screws. The free end of the main reed is mounted with an ear plate of the blunt body via screws. The free end of the main reed is placed in a slot. The free end of the auxiliary reed is not connected to the blunt body. A frequency tuning block is mounted on the blunt body via screws. The frequency tuning block is symmetrically mounted at the upper and lower ends of the blunt body or on both sides of the main reed. When the downstream frame plate is an arc plate or a bent plate, the concave surface of the blunt body is opposite to that of the downstream frame plate. The lateral distance between the outer magnet and the inner magnet it is directly opposite is adjustable. The distance between the blunt body and the downstream frame plate is adjustable. The distance between the downstream frame plate and the blunt body is L<0.5D. The width of the downstream frame plate is W<3D. D is the characteristic dimension of the cross-section of the blunt body. D is the diameter of the cylindrical blunt body or the diagonal length of the cross-section of the square prism blunt body.
[0009] In its non-operating, natural state, the external magnet on the blunt body is aligned with the internal magnet on the downstream support plate; that is, their geometric centers are located at... Figure 1 On the same horizontal line, the adjacent surfaces of the main spring and the auxiliary springs on both sides are in contact; the piezoelectric film is located on the side away from the main spring, that is, the piezoelectric film does not contact the main spring.
[0010] The main reed, secondary reed, blunt body, and outer magnet constitute a coupler. Changing the thickness of the secondary reed and the cantilever length adjusts the system stiffness. The outer magnet, its adjacent coil, and the inner magnet constitute an electromagnetic transducer. The metal reed of the secondary reed and the piezoelectric film bonded to it constitute a piezoelectric transducer. The main reed and the secondary reeds on both sides constitute a friction transducer. The friction transducer contains at least one of a main diaphragm and a secondary diaphragm; that is, at least the main reed has a main diaphragm or the secondary reed has a secondary diaphragm. When the main reed and secondary reeds contact and separate, or when the main diaphragm and secondary diaphragm contact and separate, opposite charges are generated on their surfaces. When the metal reeds of the two secondary reeds form an electrode pair, the friction transducer is an independent layer friction transducer. When the metal springs of the auxiliary and main springs form an electrode pair, the triboelectric transducer is a contact-separation triboelectric transducer. That is, when the two electrodes of the triboelectric transducer are the metal springs of the two auxiliary springs, it is an independent-layer triboelectric transducer; when the two electrodes of the triboelectric transducer are the metal springs of the auxiliary springs and the metal springs of the main spring, it is a contact-separation triboelectric transducer. The electromagnetic transducer generates electricity by the coil cutting magnetic lines of force. The piezoelectric transducer generates electricity by the stress change of the piezoelectric film when the auxiliary spring is bent and deformed. The triboelectric transducer generates electricity through the contact-separation of the main spring and the auxiliary spring. Each electromagnetic transducer, piezoelectric transducer, and triboelectric transducer is connected to the circuit board through independent wire groups and rectifier bridges.
[0011] In this invention, the blunt body, downstream frame, and upright cover are all made of non-ferromagnetic materials, including stainless steel, aluminum alloy, copper, and other metals and polymer plastics.
[0012] In this invention, the wind flows from the upstream frame b to the downstream frame e, which is a downstream excitation, resulting in high reliability and preventing the main spring from breaking due to excessive flow velocity.
[0013] Based on the magnetic pole configuration of the inner and outer magnets, in the initial working state, the outer magnet and the inner magnet face each other and their opposite magnetic poles attract each other. A slight oscillation of the outer magnet causes its like magnetic poles to face each other and the magnetic poles of the inner magnet to flip rapidly.
[0014] When the wind speed monitoring system is placed in a wind field, the coupler, i.e., the blunt body, oscillates back and forth when excited by the wind. The outer magnet alternately approaches and moves away from the inner magnet, applying torque to it, which in turn forces the inner magnet to roll. The magnetic poles of the inner magnet reverse direction. One reciprocating motion of the coupler forces the inner magnet to rotate more than one revolution. The change in the magnetic pole direction of the inner magnet causes changes in the magnetic flux density and magnetic field strength passing through the coil. The coil cuts the magnetic lines of force, and the electromagnetic transducer generates electricity. At the same time, the main spring plate forces the secondary spring plate to bend and deform. The stress on the piezoelectric film in the secondary spring plate alternately increases and decreases, and the piezoelectric transducer generates electricity. The secondary spring plate and the main spring plate alternately contact and separate, and the triboelectric transducer generates electricity. The electrical energy generated by the electromagnetic transducer, piezoelectric transducer, and triboelectric transducer is transmitted to the circuit board through wires. After conversion and processing, the electrical energy is stored or output to the anemometer. The wind speed measured by the anemometer is transmitted out by the transmitting unit.
[0015] This invention organically combines three transducers based on different principles, resulting in high energy density per unit volume and strong power generation and supply capabilities. The system's dynamic response characteristics are easily adjusted through relevant parameters. The structure and principle of the electromagnetic transducer are completely different from existing electromagnetic wind speed monitoring systems: the outer magnet forces the inner magnet to roll, thereby changing the direction of the inner magnet's magnetic poles and the strength of the magnetic field passing through the coil. The coil cuts the magnetic lines of force to generate electricity. During the rolling process of the inner magnet inside the coil, the change in the magnetic field gradient caused by the change in the inner magnet's magnetic poles is large, thus resulting in strong power generation capabilities, high output voltage, and large power output.
[0016] In this invention, to obtain better power generation capability, the parameter relationship between the coil and the inner magnet is: λ=L0 / D0=2±1, δ=T / D0=0.6±0.4, η=V / D0=2.25±0.75, β=U / D0=1.3±0.7, where D0 is the diameter of the spherical and cylindrical inner magnets, L0 is the length of the cylindrical inner magnet, T, V, and U are the wall thickness, radial width, and height of the coil, respectively, and the radial width of the coil refers to the width of the coil along the radial direction of the inner magnet; δ, η, and β are called the coil wall thickness ratio, coil width ratio, and coil height ratio, respectively, and δ, η, and β are collectively referred to as the coil parameter ratio; this invention uses the output power ratio to evaluate the power generation capability, which is the ratio of the power obtained under different structural parameters to its maximum value, and the output power is the product of the open-circuit voltage and the short-circuit current.
[0017] Advantages and features: self-sufficient energy, organic combination of multiple energy capture methods, and high volumetric energy density; fluid-driven excitation ensures high reliability of vibrating components, preventing breakage of the main reed due to excessive flow velocity; simple structure, with the system's natural frequency easily adjusted by the mass of the frequency tuning block and the stiffness of the main and auxiliary reeds, and the coupler swing amplitude easily adjusted by the distance between the downstream frame and the blunt body; in the electromagnetic transducer, the magnetic flux and field strength through the coil are changed by the change of the magnetic poles of the built-in inner magnet, resulting in strong power generation and supply capabilities; the magnetic coupling stiffness and natural frequency of the vibration system are easily adjusted by the distance between the inner and outer magnets, and the magnetic coupling force has directional adaptability. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the wind speed monitoring system in a preferred embodiment of the present invention;
[0019] Figure 2 yes Figure 1 Top view;
[0020] Figure 3 This is a schematic diagram of the coupler structure in a preferred embodiment of the present invention;
[0021] Figure 4 yes Figure 3 Top view;
[0022] Figure 5 yes Figure 3 The right view;
[0023] Figure 6 This is a schematic diagram of the downstream rack structure in a preferred embodiment of the present invention;
[0024] Figure 7 yes Figure 6 Top view;
[0025] Figure 8 This is a schematic diagram of the upstream frame in a preferred embodiment of the present invention;
[0026] Figure 9 yes Figure 8 Top view;
[0027] Figure 10 This is a graph showing the relationship between the output power ratio, coil wall thickness ratio, and height ratio in a preferred embodiment of the present invention. Detailed Implementation
[0028] The self-powered wind speed monitoring system of the present invention comprises a base a, an upstream frame b, a pressure plate c, a blunt body d, a downstream frame e, a vertical cover f, a frequency modulation block m, a main spring k, a secondary spring K, a circuit board p, a flat cover q, a coil x, an inner magnet y, an outer magnet w, and an anemometer Q. The anemometer is a commercial product. The circuit board p is equipped with an energy collection and management unit and an information transmission unit. The circuit board p is installed inside the flat cover q by screws. The flat cover q, the upstream frame b, and the downstream frame e are installed on the base a by screws. The upstream frame b is composed of an upstream frame base b1 and an upstream frame column b2. The flat cover q, the upstream frame base b1, and the downstream frame base e1 are installed on the base a by screws. The anemometer Q is installed on the upstream frame column b2 by screws on the side of the upstream frame column b2 away from the downstream frame e. The wind blows from the anemometer to the downstream frame e.
[0029] The blunt body d is a closed hollow shell. The blunt body d is a cylindrical or polygonal shell enclosed by the shell wall d1. One side of the blunt body d is provided with an ear plate d2, and the other side is inlaid with an external magnet w. The two ear plates d2 form a slot d3. The magnetic poles of the external magnet w are arranged circumferentially along the cross-section of the blunt body d. When the blunt body d is a cylindrical shell, the two magnetic poles of the external magnet w are located on the tangent of the cylindrical surface and are placed on both sides of the tangent point. The magnetic poles of two axially adjacent external magnets w on the blunt body d are arranged in the same or opposite directions.
[0030] A magnet cavity e3 and a coil cavity e4 are provided on one side of the downstream frame plate e2 of the downstream frame e. The magnet cavity e3 is located inside the coil cavity e4. The magnet cavity e3 and the coil cavity e4 are separated by a wire frame e5. The magnet cavity e3 and the coil cavity e4 outside it form a cavity group. The minimum number of cavity groups is 1. Multiple cavity groups can be arranged in a column, a row or a matrix. The downstream frame plate e2 is a flat plate, an arc plate or a bent plate. When the downstream frame plate e2 is an arc plate or a bent plate, the cavity group is located on the convex surface of the downstream frame plate e2, that is, the magnet cavity e3 and the coil cavity e4 are located on one side of the convex surface of the downstream frame plate e2.
[0031] The upright cover f is screwed onto the downstream frame plate e2 and covers the cavity assembly. The coil x and the inner magnet y are placed in the coil cavity e4 and the magnet cavity e3, respectively. The inner magnet y is a sphere or a cylinder. The inner magnet y is radially magnetized, and the magnetic poles of the inner magnet y are arranged radially. The inner magnet y can roll freely in the magnet cavity e3. The inner magnet y is located inside the coil x. The wire frame e5 separates the inner magnet y and the coil x. That is, the coil x and the inner magnet y are installed outside and inside the wire frame e5, respectively. When the inner magnet y is a cylinder, the coil axis h is perpendicular to the inner magnet axis i, and the inner magnet axis i is parallel to the blunt body axis j.
[0032] The main reed k is an independent metal reed, or the main reed k is composed of a metal reed and main diaphragms attached to its two sides; the secondary reed K is an independent metal reed, or the secondary reed K is composed of a metal reed and a piezoelectric film attached to one side, or the secondary reed K is composed of a metal reed and piezoelectric films and secondary diaphragms attached to its two sides respectively, that is, the piezoelectric film and the secondary diaphragm are respectively attached to the two sides of the metal reed; the piezoelectric film is a PVDF film or a PZT film, and the material of the metal reed is a non-ferromagnetic material such as copper, copper alloy, nickel alloy and stainless steel; the triboelectric series of the main diaphragm material and the secondary diaphragm material are far apart, and the materials of the main diaphragm and the secondary diaphragm are non-metallic materials.
[0033] One end of the main reed k and one end of the auxiliary reeds K on both sides are mounted on the upstream frame column b2 of the upstream frame b via pressure plate c and screws. The free end of the main reed k is mounted on a blunt body d via screws, and the free end of the main reed k is mounted on the ear plate d2 of the blunt body d via screws. The free end of the main reed k is placed in the slot d3, and the free end of the auxiliary reeds K is not connected to the blunt body d. A frequency tuning block m is mounted on the blunt body d via screws, and the frequency tuning block m is symmetrically installed at the upper and lower ends of the blunt body d or on the main reed k. Both sides; when the downstream frame plate e2 is an arc plate or a bent plate, the blunt body d is opposite to the concave surface of the downstream frame plate e2; the lateral distance between the outer magnet w and the inner magnet y installed opposite it is adjustable, the distance between the blunt body d and the downstream frame plate e2 is adjustable, the distance between the downstream frame plate e2 and the blunt body d is L<0.5D, the width of the downstream frame plate e2 is W<3D, D is the characteristic dimension of the cross-section of the blunt body d, D is the diameter of the cylindrical blunt body d, or the diagonal length of the cross-section of the square prism blunt body.
[0034] In its non-operating, natural state, the external magnet w on the blunt body d is aligned with the internal magnet y on the downstream support plate e2, meaning their geometric centers are located at... Figure 1 On the same horizontal line, the adjacent surfaces of the main spring k and the auxiliary springs K on both sides are in contact; the piezoelectric film is located on the side away from the main spring k, that is, the piezoelectric film does not contact the main spring k.
[0035] The main reed k, the secondary reed K, the blunt body d, and the outer magnet w constitute a coupler. Changing the thickness and cantilever length of the secondary reed K adjusts the system stiffness. The outer magnet w, along with its adjacent coil x and inner magnet y, constitute an electromagnetic transducer. The metal reed of the secondary reed K and the piezoelectric film bonded to it constitute a piezoelectric transducer. The main reed k and the secondary reeds K on both sides constitute a triboelectric transducer. The triboelectric transducer contains at least one of a main diaphragm and a secondary diaphragm. When the main reed k contacts and separates from the secondary reed K (i.e., when the main diaphragm contacts and separates from the secondary diaphragm), opposite charges are generated on their surfaces. The triboelectric transducer is an independent-layer triboelectric transducer. Alternatively, a contact-separation triboelectric transducer can be used. When the two electrodes of the triboelectric transducer are the metal springs of the two auxiliary springs K, it is an independent-layer triboelectric transducer. When the two electrodes of the triboelectric transducer are the metal springs of the auxiliary springs K and the metal springs of the main springs k, it is a contact-separation triboelectric transducer. The electromagnetic transducer generates electricity by cutting magnetic lines of force through the coil x. The piezoelectric transducer generates electricity by the stress change of the piezoelectric film when the auxiliary springs K are bent and deformed. The triboelectric transducer generates electricity through the contact-separation of the main springs k and the auxiliary springs K. Each electromagnetic transducer, piezoelectric transducer, and triboelectric transducer is connected to the circuit board p through independent wire groups and rectifier bridges.
[0036] In this invention, the blunt body d, the downstream frame e, and the upright cover f are all made of non-ferromagnetic materials, including stainless steel, aluminum alloy, copper and other metals and polymer plastics.
[0037] In this invention, the wind flows from the upstream frame b to the downstream frame e, which is a downstream excitation, resulting in high reliability and preventing the main spring k from breaking due to excessive flow velocity.
[0038] According to the magnetic pole configuration of the inner magnet y and the outer magnet w, in the initial working state, the outer magnet w and the inner magnet y are facing each other and their opposite magnetic poles attract each other. The slight oscillation of the outer magnet w causes its like magnetic poles to face each other and the magnetic poles of the inner magnet to flip rapidly.
[0039] When the wind speed monitoring system is placed in a wind field, the coupler oscillates back and forth when excited by the wind. The outer magnet w alternately approaches and moves away from the inner magnet y, applying torque to it, which in turn forces the inner magnet y to roll. The magnetic poles of the inner magnet y reverse direction. One reciprocating motion of the coupler forces the inner magnet y to rotate more than one revolution. The change in the magnetic pole direction of the inner magnet y causes changes in the magnetic flux density and magnetic field strength passing through the coil. The coil x cuts the magnetic lines of force, and the electromagnetic transducer generates electricity. At the same time, the main reed k forces the secondary reed K to bend and deform. The stress on the piezoelectric film in the secondary reed K alternately increases and decreases, and the piezoelectric transducer generates electricity. The secondary reed K and the main reed k alternately contact and separate, and the triboelectric transducer generates electricity. The electrical energy generated by the electromagnetic transducer, piezoelectric transducer and triboelectric transducer is transmitted to the circuit board p through wires. After conversion and processing, the electrical energy is stored or output to the anemometer. The wind speed measured by the anemometer is transmitted out by the transmitting unit.
[0040] In this invention, to obtain better power generation capability, the parameter relationship between coil x and inner magnet y is: λ=L0 / D0=2±1, δ=T / D0=0.6±0.4, η=V / D0=2.25±0.75, β=U / D0=1.3±0.7, where D0 is the diameter of the spherical and cylindrical inner magnet y, L0 is the length of the cylindrical inner magnet y, T, V, and U are the wall thickness, radial width, and height of coil x, respectively, and the radial width of coil x refers to the width of coil x along the radial direction of inner magnet y; δ, η, and β are called the coil wall thickness ratio, coil width ratio, and coil height ratio, respectively, and δ, η, and β are collectively referred to as the coil parameter ratio; this invention uses the output power ratio to evaluate the power generation capability, which is the ratio of the power obtained under different structural parameters to its maximum value, and the output power is the product of open-circuit voltage and short-circuit current.
[0041] This invention organically combines three transducers based on different principles, resulting in high energy density per unit volume and strong power generation and supply capabilities. The system's dynamic response characteristics are easily adjusted through relevant parameters. The structure and principle of the electromagnetic transducer are completely different from existing electromagnetic wind speed monitoring systems: the outer magnet w forces the inner magnet y to roll, thereby changing the direction of the magnetic poles of the inner magnet y and the magnetic field strength passing through the coil x. The coil x cuts the magnetic lines of force to generate electricity. During the rolling process of the inner magnet y inside the coil x, the change in the magnetic field gradient caused by the change in the magnetic poles of the inner magnet y is large, thus resulting in strong power generation capabilities, high output voltage, and large power output.
Claims
1. A self-powered wind speed monitoring system, comprising a base, an upstream frame, a pressure plate, a blunt body, a downstream frame, a vertical cover, a frequency modulation block, a main spring, a secondary spring, a circuit board, a flat cover, a coil, an inner magnet, an outer magnet, and an anemometer, wherein the blunt body, the downstream frame, and the vertical cover are all made of non-ferromagnetic materials, including stainless steel, aluminum alloy, copper, and polymer materials; characterized in that: The blunt body is a cylindrical shell. The upstream and downstream frames are mounted on a base. The anemometer, main reed, and auxiliary reeds on both sides of the main reed are mounted on the upstream frame, with the blunt body mounted on the free end of the main reed. The downstream frame is an arc plate or a bent plate, with its concave surface facing the blunt body. The blunt body is equipped with a frequency tuning block and an external magnet, the magnetic poles of which are arranged circumferentially along the cross-section of the blunt body. The downstream frame has a magnet cavity and a coil cavity separated by a wire frame; the magnet cavity is located within the coil cavity and forms a cavity group. A vertical cover is mounted on... The downstream frame is placed on top of the cavity assembly, with the coil and inner magnet positioned within the coil cavity and magnet cavity, respectively. The inner magnet can roll freely. The inner magnet is a sphere or cylinder with radially arranged magnetic poles, located within the coil. When the inner magnet is cylindrical, the coil axis is perpendicular to the inner magnet axis, and the inner magnet axis is parallel to the blunt body axis. The lateral distance between the outer magnet and the inner magnet directly opposite it is adjustable, as is the distance between the blunt body and the downstream frame. The distance between the downstream frame and the blunt body is L < 0.5D, where D is the characteristic dimension of the blunt body's cross-section. The parameter relationships between the coil and the inner magnet are: L0 / D0 = 2 ± 1, T / D0 = 0.6 ± 0.4, V / D0 = 2.25 ± 0.75, U / D0 = 1.3 ± 0.
7. Where D0 is the diameter of the inner magnet, L0 is the length of the cylindrical inner magnet, and T, V, and U are the wall thickness, radial width, and height of the coil, respectively. When not in operation, the outer magnet is aligned with the inner magnet, and the main reed and the secondary reed are in contact. The wind blows from the anemometer and the upstream frame to the downstream frame, the blunt body is excited and swings back and forth, the outer magnet alternately approaches and moves away from the inner magnet and applies torque to it, the inner magnet rolls and the magnetic poles reverse, the coil cuts the magnetic lines of force to generate electricity, the main reed forces the secondary reed to bend and deform, the piezoelectric transducer generates electricity, the secondary reed and the main reed alternately contact and separate, the friction transducer generates electricity, the electrical energy is converted and processed and stored or output to the anemometer, and the wind speed measured by the anemometer is emitted by the transmitting unit.