Permanent magnet eddy current tuned mass damper and damping device, wind power generation device

Abstract

The application provides a permanent magnet eddy current tuned mass damper, which comprises a main frame, a damping mover and a damping stator, the main frame comprises support plates at two ends and a support frame, the support plates are connected with the support frame, and support shafts are further connected between the support plates to provide sliding rails for the movement of the damping mover; the damping mover is provided with at least one shaft hole, a bearing is installed in the shaft hole, and the support shafts support the damping mover through the bearings; permanent magnets are arranged on the surface of the damping mover, the damping stator is arranged in parallel with the support shafts and opposite to the permanent magnets; elastic elements are arranged between the damping mover and the support plates at two ends, and the elastic elements are sleeved on the support shafts; and mounting structures for mounting counterweights are arranged at two ends of the damping mover. The application further provides a permanent magnet eddy current tuned mass damper device comprising at least two groups of the above dampers. The application further provides a wind power generation device comprising the above dampers.

Description

Technical Field

[0001] This invention relates to the field of vibration suppression, and in particular to a permanent magnet eddy current tuned mass damper and device for wind power generation equipment. Background Technology

[0002] Currently, material costs account for over 95% of the cost of wind turbines, with blades accounting for about 20% of the total material cost.

[0003] High-power wind turbines are the main means of reducing costs in wind power. "The longer the rotor diameter and the larger the swept area, the greater the power generation" is a widely accepted consensus in the industry. Therefore, wind turbines are currently trending towards larger sizes, which in turn leads to a continuous increase in blade size. At high wind speeds, the blades vibrate severely, affecting the product's lifespan, so dampers are needed to reduce vibration.

[0004] Currently, most wind turbine dampers on the market use liquid damping as the damping medium. These include liquid dampers or hydraulic dampers. Liquid dampers are bulky, and their damping effect is limited within the confined space of the blades. Hydraulic dampers, on the other hand, are susceptible to hydraulic oil leakage, which can cause blade corrosion, and maintenance is also more complicated. There are also linear sliding dampers that use liquid as the damping medium; however, liquid damping carries the risk of leakage and insufficient damping force. Summary of the Invention

[0005] This invention provides a permanent magnet eddy current tuned mass damper, which has a simple structure and small size, can be used in wind turbine blades, and can avoid the problems of leakage of liquid damping medium in traditional tuned mass dampers causing corrosion to the blades and low damping force.

[0006] To solve the above-mentioned technical problems, the present invention provides a permanent magnet eddy current tuned mass damper, including a main frame, a damping mover, and a damping stator. The main frame includes support plates and support frames at both ends, the support plates are connected to the support frames, and a support shaft is also connected between the support plates to provide a slide rail for the movement of the damping mover.

[0007] The damping mover is provided with at least one shaft hole, a bearing is installed in the shaft hole, and the support shaft passes through the bearing to support the damping mover; a permanent magnet is provided on the surface of the damping mover, and the damping stator is parallel to the support shaft and opposite to the permanent magnet;

[0008] An elastic element is provided between the damping actuator and the support plates at both ends, and the elastic element is sleeved on the support shaft; the damping actuator has mounting structures at both ends for mounting counterweights.

[0009] In some embodiments, at least two sets of permanent magnets are disposed on the surface of the damping mover, and at least two sets of damping stators opposite to the permanent magnets are disposed between the support plates.

[0010] In some of these implementations, the at least two sets of permanent magnets are symmetrically arranged on the damped mover.

[0011] In some embodiments, the damping mover is provided with at least one guide hole, and the support plates are provided with guide shafts corresponding to the guide holes one by one. The guide shafts pass through the guide holes and guide the damping mover.

[0012] In some embodiments, pads are provided at both ends of the bearing within the shaft hole, and pressure plates are installed at both ends of the shaft hole. After the pressure plates are locked with the damping actuator, they push the pads to press the bearing.

[0013] In some embodiments, the support frame is a conductive profile with a cavity and serves as the damping stator. The stator back iron is attached inside the cavity, and the surface of the conductive profile attached to the stator back iron is disposed opposite to the permanent magnet.

[0014] In some embodiments, the two ends of the support frame are detachably connected to the support plate.

[0015] In some embodiments, a conductive material is attached to the surface of the support frame as the damping stator.

[0016] In some embodiments, the support shaft is detachably connected to the support plate.

[0017] In some embodiments, sealing plates are fixedly connected to both ends of the support shaft. The sealing plates are provided with screw holes, and the support plates are provided with corresponding through holes. A detachable connection between the support shaft and the support plates is achieved by inserting bolts through the screw holes of the sealing plates and the through holes of the support plates and tightening them.

[0018] In some embodiments, the counterweight and the damping actuator are detachably mounted via the mounting structure to adjust the number of counterweights on the damping actuator.

[0019] In some embodiments, a screw rod passes through the inside of the damping actuator, and a through hole is provided inside the counterweight block, through which the screw rod passes. The screw rod is screwed into a nut to lock the counterweight block.

[0020] In some embodiments, the bearing is a linear bearing.

[0021] The present invention also provides a permanent magnet eddy current tuned mass damping device, comprising at least two sets of the above-mentioned permanent magnet eddy current tuned mass dampers, wherein the at least two sets of permanent magnet eddy current tuned mass dampers are installed in parallel on the supporting foot.

[0022] The present invention also provides a wind power generation device, including the aforementioned permanent magnet eddy current tuned mass damper.

[0023] Compared with the prior art, the beneficial effects of the present invention include the following aspects:

[0024] 1. The permanent magnet eddy current tuned mass damper provided by the present invention, by adopting permanent magnet eddy current damping, combined with mass block and elastic element, can suppress vibration. It has a simple structure and small size, and can be used for vibration reduction of structures with limited installation space such as wind turbine blades. At the same time, it avoids the leakage risk and the problem of small damping force caused by using liquid damping medium.

[0025] 2. The permanent magnet eddy current tuned mass damper provided by this invention generates damping force by having a damping mover installed on a damping stator parallel to the support shaft and interacting with it. It adopts a linear damping design, and the positions of the support frame and the support shaft on the support plate are adjustable, resulting in high local air gap adjustability of the damper. The damping stator, damping mover, and permanent magnet are all easy to replace, and the number of damping stator, damping mover, and permanent magnet groups on the damper can be adjusted as needed, resulting in a wider range of damper performance adjustments.

[0026] 3. The permanent magnet eddy current tuned mass damper provided by the present invention allows for the detachable installation of the counterweight block and the damping mover, which makes the counterweight scheme adjustable in a variety of ways and the damper applicable to a wider range of applications. Attached Figure Description

[0027] Figure 1 A three-dimensional view of a permanent magnet eddy current tuned mass damper;

[0028] Figure 2 Top view of a permanent magnet eddy current tuned mass damper;

[0029] Figure 3 A three-dimensional diagram of the damped mover;

[0030] Figure 4 This is a side view of the damped mover;

[0031] Figure 5 Top view of the damped mover;

[0032] Figure 6 This is a cross-sectional view of the damped mover;

[0033] Figure 7 A schematic diagram of the damping mover in the disassembled state of the counterweight;

[0034] Figure 8 This is a side view of the damped stator;

[0035] Figure 9 Schematic diagram of the supporting flange;

[0036] Figure 10 This is a schematic diagram of a permanent magnet eddy current tuned mass damping device.

[0037] Figure label:

[0038] 1. Support flange; 2. Conductive profile; 3. Support shaft; 4. Guide shaft; 5. Angle bracket; 6. Bolt; 7. Damping mover; 8. Linear bearing; 9. Flange pressure plate; 10. Permanent magnet; 11. Stator back iron; 12. Counterweight; 13. Nut; 14. Screw; 15. Spring; 16. Shaft hole; 17. Guide hole; 18. Screw through hole; 19. Support foot. Detailed Implementation

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0040] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed", "equipped", "sleeved / connected", "connected", etc., should be interpreted broadly. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0042] Currently, most dampers used in wind turbine blades use liquid damping as the damping medium. Due to the fluid nature of liquid damping, leakage is likely to occur, which can lead to corrosion of the wind turbine blades. At the same time, because the damping force of liquid damping is small, liquid dampers that meet the vibration resistance requirements of wind turbine blades occupy a large space and are not easy to install in small structures such as wind turbine blades.

[0043] To solve the above problems, refer to Figures 1 to 10 This embodiment provides a permanent magnet eddy current tuned mass damper, including a main frame, a damping mover 7, and a damping stator. The main frame includes support plates at both ends and a support frame connected between the support plates. In this embodiment, the support plates are support flanges 1, and the support shafts 3 connected between the support flanges 1 serve as slide rails.

[0044] The damping mover 7 is provided with two shaft holes 16. Linear bearings 8 are installed in the shaft holes 16 so that the damping mover 7 can meet the design requirement of a high linear velocity of 2.5 m / s. The support shaft 3 passes through the bearings and installs the damping mover 7 in the main frame. The support shaft 3 and the bearing are tolerance-fitted and move by friction, which supports the damping mover 7 and also plays a certain guiding role. Specifically, pads are provided at both ends of the bearing in the shaft holes 16. Flange pressure plates 9 are installed at both ends of the shaft holes 16. The flange pressure plates 9 are locked to the damping mover 7 by bolts. After the flange pressure plates 9 are locked, they push the pads to press the bearing and install the bearing in the shaft holes 16.

[0045] The damping actuator 7 is also provided with two guide holes 17. Guide shafts 4 corresponding to the guide holes 17 are provided between the support flanges 1. Since no bearings are installed in the guide holes 17, there is a gap between the guide shaft 4 and the guide hole 17 when the guide shaft 4 passes through the guide hole 17. There is no load-bearing relationship. The guide shaft 4 guides the damping actuator 7 when it passes through the guide hole 17. Through the assembly of two sets of support shafts 3 and two sets of guide shafts 4, the resultant force of the support force passes through the center of the damping actuator 7. The damping actuator 7 is relatively stable when it is installed in the main frame.

[0046] The number of shaft holes 16 and guide holes 17 varies depending on the damping actuator 7, and is not limited to the two shaft holes 16 and two guide holes 17 in this embodiment. Therefore, in order to accommodate different numbers of shaft holes 16 and guide holes 17, the support shaft 3 and guide shaft 4 are detachably connected to the support flange 1. Specifically, sealing plates are fixedly connected to both ends of the support shaft 3 and guide shaft 4. The sealing plates are provided with screw holes, and the support flange 1 is provided with corresponding through holes. The detachable connection between the support shaft 3 and guide shaft 4 and the support flange 1 is achieved by inserting bolts 6 through the screw holes of the sealing plates and the through holes on the support flange 1 and tightening them.

[0047] The surface of the damping mover 7 is provided with a permanent magnet 10. A damping stator is also connected between the supporting flanges 1 and is disposed opposite to the permanent magnet 10. The damping stator is a conductive profile 2 with a cavity. The conductive profile 2 also serves as a support frame to support the support plate and form the main frame. The stator back iron 11 is attached to the inside of the cavity. The surface of the conductive profile 2 attached to the stator back iron 11 is disposed opposite to the permanent magnet 10. When the conductive profile 2 is connected between the supporting flanges 1, it is parallel to the support shaft 3. Specifically, the conductive profile 2 is an aluminum profile, which is lightweight and easy to install. As a simple alternative to this embodiment, conductive material can also be attached to the conductive support frame as a damping stator.

[0048] Elastic element springs 15 are provided between the damping actuator 7 and the support flanges 1 at both ends. The springs 15 are sleeved on the support shaft 3 and the guide shaft 4. Each support shaft 3 and guide shaft 4 limits the upper and lower positions of each spring 15 to prevent the spring 15 from collapsing in the up, down, left and right directions after compression. Counterweights 12 are installed at both ends of the damping actuator 7.

[0049] When the wind turbine blades vibrate, the damping mover 7 moves along the axis of the support shaft 3 under the action of an external force. At the same time, the damping mover 7 moves relative to the conductive profile 2, inducing eddy currents on the conductive profile 2. These eddy currents generate magnetic fields, which interact with the original magnetic field generated by the permanent magnet 10. According to Lenz's law, this generates a damping force that opposes the movement of the mover, thus dissipating the energy generated by the external force. Simultaneously, the damper resonates in the opposite direction to the wind turbine blades due to the inertia of the counterweight 12 and the elastic restoring force generated by the spring 15. Part of the energy generated by the external force is converted into the kinetic energy of the counterweight 12, and part is converted into the elastic potential energy of the spring 15 and dissipated, thereby achieving the effect of vibration reduction.

[0050] To increase damping force and improve local air gap adjustability, in this embodiment, three sets of permanent magnets 10 are symmetrically arranged on the surface of the damping actuator 7. Similarly, three sets of conductive profiles 2 are arranged between the supporting flanges 1, opposite to the permanent magnets 10. The three sets of conductive profiles 2 form a three-point support, allowing for linear sliding on one side, resulting in high local air gap adjustability (the air gap of a circular support is controlled by components, making air gap adjustment difficult and force control challenging). The three sets of conductive profiles 2 are not covered, facilitating maintenance and repair. The number of permanent magnets 10 on the damping actuator 7 is determined by the required damping force of the wind turbine blades and is not limited to three sets in this embodiment. The number of conductive profiles 2 is also adjusted according to the specific application scenario. Therefore, to facilitate adjustment of the number of conductive profiles 2, in this embodiment, both ends of the conductive profiles 2 are detachably connected to the supporting flanges 1. Specifically, the conductive profiles 2 and the supporting flanges 1 are connected via angle brackets 5 or angle steel.

[0051] In this embodiment, the counterweight 12 and the damping actuator 7 are detachably installed, thereby allowing adjustment of the number of counterweights 12 on the damping actuator 7. This makes the counterweight adjustment scheme of the damper more diverse and the application range of the damper wider. Specifically, a screw 14 is installed inside the damping actuator 7 as an installation structure. A screw through hole 18 is provided inside the counterweight 12, and the screw 14 is inserted through the screw through hole 18. The screw 14 is screwed into a nut 13 to lock the counterweight 12. The counterweight 12 can be easily adjusted by the cooperation of the nut 13 and the screw 14. When it is necessary to increase or decrease the number of counterweights 12, simply unscrew the nut 13 from the screw 14, insert or remove the counterweight 12 from the screw 14, and then screw the nut 13 back in to lock it.

[0052] To meet the damping force requirements of different structural bodies, this embodiment also provides a permanent magnet eddy current tuned mass damping device. The device combines and installs permanent magnet eddy current tuned mass dampers and then installs them in the structural body that needs vibration resistance. In this embodiment, according to the actual installation requirements of the wind turbine site, two of the above-mentioned permanent magnet eddy current tuned mass dampers are installed side by side on the supporting foot 19 to form the permanent magnet eddy current tuned mass damping device.

[0053] The above description is merely a preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention by those skilled in the art within the scope of the technology disclosed in the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A permanent magnet eddy current tuned mass damper, comprising a main frame, a damped mover, and a damped stator, characterized in that: The main frame includes support plates at both ends, and support frames and support shafts connecting the support plates at both ends; the damping mover is provided with shaft holes and guide holes, a bearing is installed in the shaft hole, and the support shaft passes through the bearing to support the damping mover; guide shafts corresponding to the guide holes are provided between the support plates, and the guide shafts pass through the guide holes and guide the damping mover. The surface of the damping mover is provided with a permanent magnet. The support frame is a conductive profile with a cavity and serves as the damping stator. The stator back iron is attached to the inside of the cavity. The surface of the conductive profile attached to the stator back iron is positioned opposite to the permanent magnet. Pads are provided at both ends of the bearing in the shaft hole. Pressure plates are installed at both ends of the shaft hole. After the pressure plates are locked with the damping mover, they push the pads to press the bearing. An elastic element is provided between the damping mover and the support plates at both ends. The elastic element is sleeved on the support shaft. A screw is inserted inside the damping mover. Counterweights are installed at both ends of the damping mover. The counterweights have through holes inside, and the screw is inserted through the through holes. The screw is screwed into a nut to lock the counterweight.

2. The permanent magnet eddy current tuned mass damper according to claim 1, characterized in that, At least two sets of permanent magnets are disposed on the surface of the damping mover, and at least two sets of damping stators opposite to the permanent magnets are disposed between the support plates.

3. The permanent magnet eddy current tuned mass damper according to claim 2, characterized in that, The at least two sets of permanent magnets are symmetrically arranged on the damped mover.

4. The permanent magnet eddy current tuned mass damper according to claim 1, characterized in that, The support shaft is detachably connected to the support plate.

5. The permanent magnet eddy current tuned mass damper according to claim 4, characterized in that, The support shaft is fixedly connected to both ends of a sealing plate. The sealing plate is provided with screw holes, and the support plate is provided with corresponding through holes. The support shaft and the support plate are detachably connected by bolts passing through the screw holes of the sealing plate and the through holes of the support plate and being tightened.

6. The permanent magnet eddy current tuned mass damper according to claim 1, characterized in that, The two ends of the support frame are detachably connected to the support plate.

7. The permanent magnet eddy current tuned mass damper according to claim 1, characterized in that, The bearing is a linear bearing.

8. A permanent magnet eddy current tuned mass damping device, characterized in that, It includes at least two sets of permanent magnet eddy current tuned mass dampers as described in any one of claims 1-7, wherein the at least two sets of permanent magnet eddy current tuned mass dampers are installed side by side on the supporting foot.

9. A wind power generation device, characterized in that, Includes the permanent magnet eddy current tuned mass damper as described in any one of claims 1-7.

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