Transmission system, wind turbine generator set and control method of wind turbine generator set

Abstract

The present invention relates to a transmission system, a wind turbine generator set, and a control method for a wind turbine generator set. The transmission system includes a shafting structure and a magnetic component. The shafting structure includes a rotating component, a fixed shaft, and a bearing structure. The rotating component and the stationary component are coaxially arranged and rotatably connected through the bearing structure. The rotating component has a first end in its own axial direction, and the stationary component has a second end in the axial direction. The first end and the second end are arranged facing each other. A non-contact bearing component is provided on at least one of the first end and the second end. The non-contact bearing component can apply a force to the rotating component to reduce the axial force acting on the bearing structure along the axial direction by the rotating component. The transmission system, the wind turbine generator set, and the control method for the wind turbine generator set provided by the present invention can reduce the possibility of damage to the bearing structure in the transmission system, which is beneficial to improving the overall service life of the transmission system.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a transmission system, a wind turbine generator set, and a control method for a wind turbine generator set. Background Art

[0002] A wind turbine generator set can convert the natural wind energy in nature into utilizable electric energy and has a wide range of applications. The wind turbine generator set mainly includes a direct-drive wind turbine generator set and a doubly-fed wind turbine generator set. However, in the existing wind turbine generator set, the impeller and the nacelle are directly connected through a transmission system. Due to the large weight of the impeller and the load acting on it by the wind energy, the weight and the load borne by the impeller will act on the bearing structure inside the transmission system, which is disadvantageous to the load bearing of each bearing in the bearing structure, especially the bearing close to the impeller side, and affects the overall service life of the transmission system. Summary of the Invention

[0003] Embodiments of the present invention provide a transmission system, a wind turbine generator set, and a control method for a wind turbine generator set, which can reduce the possibility of damage to the bearing structure in the transmission system and is beneficial to improving the overall service life of the transmission system.

[0004] On the one hand, according to an embodiment of the present invention, a transmission system is provided, which includes:

[0005] A shafting structure, including a rotating component, a stationary component, and a bearing structure. The rotating component and the stationary component are coaxially arranged and are rotationally connected through the bearing structure. The rotating component has a first end in its own axial direction, and the stationary component has a second end in the axial direction. The first end and the second end are arranged facing each other;

[0006] A non-contact load-bearing component is arranged on at least one of the first end and the second end. The non-contact load-bearing component can apply a force to the rotating component to reduce the axial force acting on the bearing structure along the axial direction by the rotating component.

[0007] According to an embodiment of the present invention, the non-contact load-bearing component includes a magnetic force assembly. The magnetic force assembly includes a first magnetic component and a second magnetic component. One of the first magnetic component and the second magnetic component is arranged on the first end, and the other is arranged on the second end. The force includes the repulsive force that can be generated between the first magnetic component and the second magnetic component.

[0008] According to an embodiment of the present invention, the magnitude of the repulsive force generated between the first magnetic component and the second magnetic component is adjustable.

[0009] According to an embodiment of the present invention, the transmission system further includes a sensor for collecting a load signal, and the load signal is used to characterize the magnitude of the stress borne by the rotating component in the axial direction;

[0010] A controller that adjusts the magnitude of the repulsive force generated between a first magnetic component and a second magnetic component according to a load signal.

[0011] According to an embodiment of the present invention, the sensor includes at least one of a stress sensor, a strain sensor, a displacement sensor, and a load sensor.

[0012] According to an embodiment of the present invention, the distance between the first magnetic component and the second magnetic component is adjustable, or the magnitude of the magnetic force of the first magnetic component itself and / or the magnitude of the magnetic force of the second magnetic component itself is adjustable.

[0013] According to an embodiment of the present invention, the first magnetic component is disposed at the first end, the second magnetic component is disposed at the second end, the first magnetic component is a permanent magnet, and the second magnetic component is an electromagnet.

[0014] According to an embodiment of the present invention, the magnetic component is an annular structure distributed around the rotation axis of the rotating component.

[0015] According to an embodiment of the present invention, more than two magnetic components are distributed around the rotation axis of the rotating component. Among the more than two first magnetic components, some of the first magnetic components are permanent magnets, and some of the first magnetic components are electromagnets, and / or among the more than two second magnetic components, some of the second magnetic components are permanent magnets, and some of the second magnetic components are electromagnets.

[0016] According to an embodiment of the present invention, one of the first magnetic component and the second magnetic component in each magnetic component is a permanent magnet, and the other is an electromagnet.

[0017] According to an embodiment of the present invention, one of the adjacent two first magnetic components is a permanent magnet, and the other is an electromagnet; and / or one of the adjacent two second magnetic components is a permanent magnet, and the other is an electromagnet.

[0018] According to an embodiment of the present invention, along the axial direction, the positive projection of one of the first magnetic component and the second magnetic component covers the positive projection of the other.

[0019] According to the drive system provided by the embodiments of the present invention, when used in a wind turbine generator set, a rotating component can be connected to an impeller, so that when the impeller rotates under the action of wind energy, it can drive the rotating component to rotate relative to a stationary component. The non-contact bearing component provided by the embodiments of the present invention can apply a force to the rotating component. This force is opposite to the direction of the axial force applied by the impeller to the rotating component, so as to reduce the axial force of the rotating component acting on the bearing structure along the axial direction. Thus, it can be used to balance the load acting on the impeller due to wind energy, reduce the possibility of damage to the bearing structure in the shafting structure caused by the load borne by the impeller, and further contribute to improving the service life of the bearing structure and the overall drive system, and can ensure the power generation efficiency of the wind turbine generator set. In addition, since the bearing structure does not need to bear a large axial force, the matching of bearing types in the shafting can be configured more flexibly, a bearing type with higher cost performance can be selected, or a bearing with a smaller size can be selected, thereby reducing the manufacturing cost of the wind turbine generator set.

[0020] On the other hand, according to an embodiment of the present invention, a wind turbine generator set is provided, which includes:

[0021] A nacelle;

[0022] A drive system as in the above embodiment, with the stationary component connected to the nacelle;

[0023] An impeller, connected to the rotating component.

[0024] In yet another aspect, according to an embodiment of the present invention, a control method for a wind turbine generator set is provided, which includes:

[0025] Obtain a load signal, where the load signal is used to characterize the magnitude of the stress borne by the impeller connected to the rotating component of the shafting structure in the axial direction of the rotating component;

[0026] Use the load signal to determine the axial force borne by the bearing structure of the shafting structure in the axial direction;

[0027] Adjust the magnitude of the force applied by the non-contact bearing component to the rotating component according to the axial force. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The features, advantages and technical effects of the exemplary embodiments of the present invention will be described below with reference to the drawings.

[0029] Figure 1 is a schematic diagram of the overall structure of a wind turbine generator set according to an embodiment of the present invention;

[0030] Figure 2 is a schematic cross-sectional structure diagram of a drive system according to an embodiment of the present invention;

[0031] Figure 3 is Figure 2 an enlarged view of part A in

[0032] Figure 4 is a schematic cross-sectional structure diagram of the drive system according to another embodiment of the present invention;

[0033] Figure 5 is Figure 4 the enlarged view at D in

[0034] Figure 6 is Figure 2 the schematic cross-sectional view along the B-B direction in

[0035] Figure 7 is Figure 2 the schematic cross-sectional view along the C-C direction in

[0036] Figure 8 is a schematic partial cross-sectional structure diagram of a wind turbine according to an embodiment of the present invention;

[0037] Figure 9 is a schematic partial cross-sectional structure diagram of a wind turbine according to another embodiment of the present invention;

[0038] Figure 10 is a schematic flowchart of a control method for a wind turbine according to an embodiment of the present invention.

[0039] In the drawings, the same components are denoted by the same reference numerals. The drawings are not drawn to actual scale.

[0040] Marking description:

[0041] 1. Drive system;

[0042] 10. Shafting structure; 11. Rotating component; 111. First end; 12. Fixed shaft; 121. Second end; 13. Bearing structure; 131. First bearing; 132. Second bearing;

[0043] 20. Magnetic assembly; 21. First magnetic component; 22. Second magnetic component;

[0044] 30. Sensor;

[0045] 40. Controller;

[0046] 50. Driving assembly;

[0047] 100. Tower; 200. Nacelle; 300. Generator; 400. Impeller; 410. Hub; 420. Blade;

[0048] X. Axial direction. Detailed implementation manners

[0049] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present invention by showing examples of the present invention. In the drawings and the following description, at least some of the well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the present invention; and, for clarity, the dimensions of some structures may be exaggerated. In addition, the features, structures, or characteristics described below may be combined in any suitable manner in one or more embodiments.

[0050] The orientation terms appearing in the following description are all the directions shown in the figures, and do not limit the specific structures of the vacuum infusion method, auxiliary device, infusion system, and diversion tube of the present invention. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected or indirectly connected. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] For a better understanding of the present invention, the following Figures 1 to 10 describes the embodiments of the present invention.

[0052] See Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a wind turbine generator set, including a tower 100, a nacelle 200, a generator 300, a transmission system 1, and an impeller 400. The tower 100 is connected to the wind turbine foundation. The nacelle 200 is arranged at the top of the tower 100. The nacelle 200 can be connected to the tower 100. The impeller 400 includes a hub 410 and a plurality of blades 420 connected to the hub 410. The generator 300 is arranged in the nacelle 200. In some examples, the wind turbine generator set may be a direct-drive wind turbine generator set. The generator 300 may be located outside the nacelle 200. The generator 300 includes a rotor and a stator (not shown in the figure). The rotor can be connected to the hub 410 through the transmission system 1. The stator can be connected to the nacelle 200 through the transmission system 1. When the wind acts on the blades 420, the blades 420 drive the hub 410 to rotate. The hub 410 drives the rotor of the generator 300 to rotate relative to the stator through the transmission system 1, realizing the power generation requirement of the wind turbine generator set.

[0053] It should be noted that the wind turbine generator set in the embodiment of the present invention is not limited to the above-mentioned direct-drive wind turbine generator set, and may also be a semi-direct-drive wind turbine generator set or a doubly-fed wind turbine generator set with a gearbox. In the semi-direct-drive wind turbine generator set or the doubly-fed wind turbine generator set, the generator 300 may be located inside the nacelle 200. The rotor of the generator 300 is connected to the output shaft of the gearbox, and the drive system 1 is connected to the input shaft of the gearbox. The input shaft of the gearbox is connected to the hub 410 through the drive system 1.

[0054] The impeller 400 of the wind turbine generator set provided in the embodiment of the present invention can be connected to the nacelle 200 through the drive system 1. Since the impeller 400 needs to bear the load exerted by the wind energy, and the load it bears will act on the bearing structure 13 inside the drive system 1, which makes the bearing structure 13 unfavorably loaded and affects the overall life of the drive system 1.

[0055] Based on the above technical problems, the embodiment of the present invention provides a drive system 1, which can be produced and used as an independent component, and of course can also be used in the wind turbine generator set provided in the above embodiment and be used as a component of the wind turbine generator set.

[0056] The drive system 1 provided in the embodiment of the present invention includes a shafting structure 10 and a non-contact load-bearing component. The shafting structure 10 includes a rotating component 11, a stationary component 12, and a bearing structure 13. The rotating component 11 is connected to the stationary component 12 and can rotate relative to the stationary component 12. The rotating component 11 and the stationary component 12 are coaxially arranged and are rotationally connected through the bearing structure 13. The rotating component 11 and the stationary component 12 are sleeved with each other. One of the rotating component 11 and the stationary component 12 is inserted into the other, and the bearing structure 13 is arranged at the insertion position of the two and is located between the two. The rotating component 11 has a first end 111 on its own axial direction X. The stationary component 12 has a second end 121 on the axial direction X. The first end 111 of the rotating component 11 and the second end 121 of the stationary component 12 are arranged facing each other. The non-contact load-bearing component does not contact the first end 111 and the second end 121 at the same time. After the non-contact load-bearing component is provided, the rotating component 11 and the stationary component 12 still remain in a non-contact state. The non-contact load-bearing component is arranged on at least one of the first end 111 and the second end 121. The non-contact load-bearing component can exert a force on the rotating component 11 to reduce the axial force of the rotating component 11 acting on the bearing structure 13 along the axial direction X.

[0057] When the force borne by the rotating component 11 causes the first end 111 of the rotating component 11 to have a tendency to move towards the second end 121 of the stationary component 12 or move towards the second end 121 of the stationary component 12, the rotating component 11 will act on the bearing structure 13 with an axial force along the axial direction X.

[0058] Since the force exerted by the non-contact bearing member on the rotating member 11 is opposite to the direction of the force borne by the rotating member 11, a part or all of the force borne by the rotating member 11 can be offset, so as to reduce the axial force exerted by the rotating member 11 on the bearing structure 13, thereby reducing the load borne by the bearing structure 13.

[0059] In the transmission system 1 provided by the embodiment of the present invention, when used in a wind power generation unit, the rotating member 11 can be connected to the impeller 400, and the stationary member 12 can be connected to the nacelle 200, so that when the impeller 400 rotates under the action of wind energy, it can drive the rotating member 11 to rotate relative to the stationary member 12. The non-contact bearing member provided by the embodiment of the present invention can exert a force on the rotating member 11. This force is opposite to the axial force exerted by the impeller 400 on the rotating member 11, so as to reduce the axial force exerted by the rotating member 11 on the bearing structure 13 along the axial direction X, thereby being used to balance the load caused by the wind energy borne on the impeller 400, reducing the possibility of damage to the bearing structure 13 in the shafting structure 10 caused by the load borne by the impeller 400, and further being beneficial to improving the overall service life of the bearing structure 13 and the transmission system 1, and ensuring the power generation efficiency of the wind power generation unit. In addition, since the bearing structure 13 does not need to bear a large axial force, the bearing type matching in the shafting can be configured more flexibly, a bearing type with higher cost performance can be selected, or a bearing with a smaller size can be selected, thereby reducing the manufacturing cost of the wind power generation unit.

[0060] In some embodiments, referring to Figure 2 and Figure 3 as shown, the non-contact bearing member provided by the embodiment of the present invention includes a magnetic force assembly 20. The magnetic force assembly 20 includes a first magnetic force member 21 and a second magnetic force member 22. One of the first magnetic force member 21 and the second magnetic force member 22 is disposed at the first end portion 111 of the rotating member 11, and the other is disposed at the second end portion 121 of the stationary member 12. A repulsive force can be generated between the first magnetic force member 21 and the second magnetic force member 22. The force exerted by the non-contact bearing member on the rotating member 11 includes the repulsive force generated between the first magnetic force member 21 and the second magnetic force member 22. Since the repulsive force generated between the first magnetic force member 21 and the second magnetic force member 22 is opposite to the direction of the force borne by the rotating member 11, a part or all of the force borne by the rotating member 11 can be offset, so as to reduce or eliminate the axial force exerted by the rotating member 11 on the bearing structure 13, thereby reducing the load borne by the bearing structure 13.

[0061] In some embodiments, referring to Figure 2As shown, the bearing structure 13 includes a first bearing 131 and a second bearing 132. The first bearing 131 and the second bearing 132 are spaced apart along the axial direction X. The first bearing 131 and the second bearing 132 are located between the rotating component 11 and the stationary component 12. The rotating component 11 and the stationary component 12 are rotatably connected to each other through the first bearing 131 and the second bearing 132. Optionally, the first bearing 131 is close to the first end 111 of the rotating component 11, and the second bearing 132 is far away from the first end 111 of the rotating component 11, that is, when used in a wind turbine generator set, the first bearing 131 is arranged closer to the impeller 400, and the second bearing 132 is arranged away from the impeller 400. Optionally, the first bearing 131 can be a ball bearing, a cylindrical bearing or a tapered bearing. The second bearing 132 can be a ball bearing, a cylindrical bearing or a tapered bearing.

[0062] In some other embodiments, the bearing structure 13 may include one bearing. Optionally, the bearing structure 13 may be a double-row tapered roller bearing, a double-row ball bearing or a double-row cylindrical roller bearing. Alternatively, the bearing structure 13 may also include more than three bearings. The three or more bearings are spaced apart along the axial direction X. The bearing may be a ball bearing, a cylindrical bearing or a tapered bearing.

[0063] It should be noted that the number and type of bearings included in the bearing structure 13 are not limited to the numbers and types listed above, but the number and type of bearings can be flexibly selected according to needs.

[0064] In some embodiments, see Figure 3 As shown, along the axial direction X of the rotating component 11, the orthographic projection of one of the first magnetic component 21 and the second magnetic component 22 covers the orthographic projection of the other, thereby reducing the possibility that the rotating component 11 is offset in the radial direction of the rotating component 11 itself, causing the first magnetic component 21 and the second magnetic component 22 to be staggered from each other, so that the repulsive force generated between the first magnetic component 21 and the second magnetic component 22 changes, which is beneficial to ensure the stability of the repulsive force generated between the first magnetic component 21 and the second magnetic component 22.

[0065] In some embodiments, the magnitude of the repulsive force generated between the first magnetic component 21 and the second magnetic component 22 is adjustable. Since the force exerted by the wind energy on the impeller 400 can vary, the force exerted by the impeller 400 on the rotating component 11 also varies, and thus the axial force exerted by the rotating component 11 on the bearing structure 13 also varies. Therefore, the magnitude of the repulsive force generated between the first magnetic component 21 and the second magnetic component 22 can be adjusted according to the magnitude of the axial force exerted by the rotating component 11 on the bearing structure 13, so that the magnetic assembly 20 can better adapt to the change of the axial force exerted by the rotating component 11 on the bearing structure 13, which is beneficial to accurately controlling the magnitude of the axial force exerted by the rotating component 11 on the bearing structure 13.

[0066] In some embodiments, referring to Figure 4 As shown, the transmission system 1 further includes a sensor 30 and a controller 40. The sensor 30 is used to collect load signals. The load signals are used to characterize the magnitude of the stress borne by the rotating component 11 in the axial direction X. The controller 40 can analyze the stress change of the rotating component 11 through the load signals collected by the sensor 30, so as to better adjust the magnitude of the repulsive force generated between the first magnetic component 21 and the second magnetic component 22 according to the load signals, so as to ensure that the magnetic assembly 20 can well adapt to the stress change of the rotating component 11. Exemplarily, the sensor 30 is disposed on the rotating component 11. Wireless communication can be adopted between the sensor 30 and the controller 40. Optionally, the sensor 30 includes at least one of a stress sensor, a strain sensor, a displacement sensor, and a load sensor.

[0067] In some embodiments, the magnitude of the repulsive force generated between the first magnetic component 21 and the second magnetic component 22 is adjusted by adjusting the distance W between the first magnetic component 21 and the second magnetic component 22. Exemplarily, referring to Figure 5 As shown, the first magnetic component 21 is disposed at the first end 111 of the rotating component 11. The second magnetic component 22 is movably disposed along the axial direction X at the second end 121 of the stationary component 12. The transmission system 1 further includes a driving assembly 50. The driving assembly 50 can be disposed at the second end 121 of the stationary component 12. The second magnetic component 22 is connected to the output end of the driving assembly 50. The driving assembly 50 can drive the second magnetic component 22 to move along the axial direction X relative to the second end 121 of the stationary component 12 to change the distance W between the first magnetic component 21 and the second magnetic component 22. The controller 40 can control the driving assembly 50. Optionally, the driving assembly 50 can be a hydraulic cylinder, a pneumatic cylinder, or an electric cylinder.

[0068] Understandably, the driving assembly 50 can also be disposed at the first end portion 111 of the rotating member 11. The first magnetic member 21 is connected to the output end of the driving assembly 50. The driving assembly 50 can drive the first magnetic member 21 to move along the axial direction X to change the distance W between the first magnetic member 21 and the second magnetic member 22.

[0069] In some embodiments, both the first magnetic member 21 and the second magnetic member 22 are permanent magnets. On the one hand, the structures of the first magnetic member 21 and the second magnetic member 22 are simple, and they are easy to be installed and fixed on the rotating member 11 or the stationary member 12, thus reducing the installation difficulty. On the other hand, the first magnetic member 21 and the second magnetic member 22 have strong adaptability to harsh environments, with good reliability and stability, which can reduce the maintenance difficulty. Exemplarily, in this embodiment, the repulsive force generated between the first magnetic member 21 and the second magnetic member 22 can be adjusted by adjusting the distance W between the first magnetic member 21 and the second magnetic member 22.

[0070] In some embodiments, the first magnetic member 21 is disposed at the first end portion 111 of the rotating member 11. The second magnetic member 22 is disposed at the second end portion 121 of the stationary member 12. The first magnetic member 21 is a permanent magnet, while the second magnetic member 22 is an electromagnet. Since the second magnetic member 22 needs to arrange corresponding circuit structures, disposing the second magnetic member 22 at the second end portion 121 of the stationary member 12 can reduce the difficulty and complexity of arranging the circuit structures, which is beneficial to improving the installation convenience of the second magnetic member 22 and the reliability and stability during the later operation process.

[0071] Exemplarily, since the magnetic force of the second magnetic member 22 itself can be adjusted, the repulsive force generated between the first magnetic member 21 and the second magnetic member 22 can be adjusted by adjusting the magnetic force of the second magnetic member 22 itself.

[0072] Exemplarily, the repulsive force generated between the first magnetic member 21 and the second magnetic member 22 can be adjusted by adjusting the distance W between the first magnetic member 21 and the second magnetic member 22.

[0073] In some embodiments, refer to Figure 6 and Figure 7 As shown, the magnetic assembly 20 is an annular structure distributed around the rotation axis of the rotating member 11. Thus, the magnetic assembly 20 can generate repulsive forces in the entire circumferential direction of the rotating member 11, so that the magnetic assembly 20 can apply acting forces to the rotating member 11 in the entire circumferential direction, and further can better balance the acting forces borne by the rotating member 11 in different regions in the entire circumferential direction.

[0074] In some alternative embodiments, both the first magnetic member 21 and the second magnetic member 22 are an integral ring structure. Exemplarily, the first magnetic member 21 and the second magnetic member 22 may be permanent magnets. Exemplarily, the first magnetic member 21 is disposed at the first end portion 111 of the rotating member 11, while the second magnetic member 22 is disposed at the second end portion 121 of the stationary member 12. The first magnetic member 21 may be a permanent magnet, while the second magnetic member 22 may be an electromagnet.

[0075] In some alternative embodiments, more than two magnetic force assemblies 20 are distributed around the rotation axis of the rotating member 11. Each magnetic force assembly 20 includes a first magnetic member 21 and a second magnetic member 22. Among the more than two first magnetic members 21, some of the first magnetic members 21 are permanent magnets, and the other part of the first magnetic members 21 are electromagnets. And / or, among the more than two second magnetic members 22, some of the second magnetic members 22 are permanent magnets, and the other part of the second magnetic members 22 are electromagnets. Therefore, by adopting the mixed arrangement of permanent magnets and electromagnets, when the repulsive force generated by the permanent magnet meets the requirements, the electromagnet can be in a power-off and non-magnetic state, and when the repulsive force generated by the permanent magnet does not meet the requirements, the electromagnet can be enabled for stress compensation to increase the repulsive force between the first magnetic member 21 and the second magnetic member 22, thereby improving the overall adaptability of the magnetic force assembly 20.

[0076] Exemplarily, referring to Figure 6 as shown, more than two first magnetic members 21 are evenly distributed around the rotation axis of the rotating member 11. And / or, referring to Figure 7 as shown, more than two second magnetic members 22 are evenly distributed around the rotation axis of the rotating member 11.

[0077] In some alternative embodiments, in each magnetic force assembly 20, one of the first magnetic member 21 and the second magnetic member 22 is a permanent magnet, and the other is an electromagnet. Since the magnetic force of the electromagnet itself can be adjusted, the repulsive force generated by each magnetic force assembly 20 can be adjusted individually. Thus, the repulsive forces generated by each magnetic force assembly 20 can be the same as each other, or the repulsive forces generated by each magnetic force assembly 20 can be different from each other, or among more than two magnetic force assemblies 20, the repulsive forces generated by some of the magnetic force assemblies 20 can be the same as each other, and the repulsive forces generated by the other part of the magnetic force assemblies 20 can be different from each other. Therefore, the repulsive force generated by each magnetic force assembly 20 can be flexibly adjusted according to the magnitude of the acting force borne by different regions of the rotating member 11 in its own circumferential direction, so as to effectively ensure that the load borne by the rotating member 11 as a whole reaches equilibrium, and further ensure the balance of the axial force exerted by the rotating member 11 on the bearing structure 13.

[0078] In some alternative embodiments, one of two adjacent first magnetic members 21 is a permanent magnet and the other is an electromagnet. And / or, one of two adjacent second magnetic members 22 is a permanent magnet and the other is an electromagnet. Along the circumferential direction of the rotating member 11 itself, the permanent magnets and the electromagnets are alternately arranged, so that the permanent magnets are annularly distributed and the electromagnets are also annularly distributed. When the repulsive force generated by the permanent magnets does not meet the requirements, the electromagnets are activated for stress compensation to increase the repulsive force generated between the first magnetic member 21 and the second magnetic member 22. Since the electromagnets are annularly distributed, the activated electromagnets can generate magnetic forces simultaneously in different regions in the circumferential direction of the rotating member 11 itself, so as to ensure that the loads borne by different regions in the circumferential direction of the rotating member 11 itself tend to be consistent, and reduce the possibility of the rotating member 11 being eccentrically loaded when the electromagnets are activated.

[0079] In some embodiments, referring to Figure 8 As shown, for the shafting structure 10 provided in the embodiment of the present invention, its rotating member 11 can be located inside the stationary member 12 and coaxially arranged with the stationary member 12. The impeller 400 is connected to the first end 111 of the rotating member 11, and the second end 121 of the stationary member 12 is arranged close to the impeller 400. Sensors 30 can be arranged on the blades 420 in the impeller 400 to collect load signals of the stress magnitudes borne by the blades 420 in the axial direction X. The axial force borne by the bearing structure 13 of the shafting structure 10 in the axial direction X is determined by using the load signals. Exemplarily, sensors 30 can be arranged at the blade roots of the blades 420 close to the hub 410.

[0080] In some embodiments, referring to Figure 9 As shown, for the shafting structure 10 provided in the embodiment of the present invention, its rotating member 11 can be located outside the stationary member 12 and coaxially arranged with the stationary member 12. The impeller 400 is connected to the end of the rotating member 11 far from the first end 111, and the second end 121 of the stationary member 12 is arranged far from the impeller 400. The first bearing 131 is close to the first end 111 of the rotating member 11, and the second bearing 132 is far from the first end 111 of the rotating member 11, that is, when used in a wind power generation set, the second bearing 132 is closer to the impeller 400, and the first bearing 131 is far from the impeller 400. Sensors 30 can be arranged on the blades 420 in the impeller 400 to collect load signals of the stress magnitudes borne by the blades 420 in the axial direction X. The axial force borne by the bearing structure 13 of the shafting structure 10 in the axial direction X is determined by using the load signals.

[0081] In some embodiments, the non-contact bearing component provided by the embodiments of the present invention may include at least one of a pneumatic component and a hydraulic component. Among them, the pneumatic component can generate thrust by jetting air. The force exerted by the non-contact bearing component on the rotating component 11 is the thrust generated by the pneumatic component. The thrust generated by the pneumatic component is opposite to the direction of the force borne by the rotating component 11. Therefore, it can offset a part or all of the force borne by the rotating component 11, so as to reduce or eliminate the axial force exerted by the rotating component 11 on the bearing structure 13, thereby reducing the load borne by the bearing structure 13. Exemplarily, the pneumatic component may be provided on at least one of the first end 111 of the rotating component 11 and the second end 121 of the stationary component 12. Exemplarily, the pneumatic component has a jet nozzle. The jet nozzle is located between the first end 111 of the rotating component 11 and the second end 121 of the stationary component 12. The jet direction of the jet nozzle is parallel to the axial direction X.

[0082] See Figure 10 As shown, the embodiments of the present invention also provide a control method for a wind turbine generator, which includes:

[0083] Obtain a load signal, where the load signal is used to characterize the magnitude of the stress borne by the impeller 400 connected to the rotating component 11 of the shafting structure 10 in the axial direction X of the rotating component 11;

[0084] Use the load signal to determine the axial force borne by the bearing structure 13 of the shafting structure 10 in the axial direction X;

[0085] Adjust the magnitude of the force exerted by the non-contact bearing component on the rotating component 11 according to the axial force.

[0086] The shafting structure in this embodiment may be the shafting structure 10 in any of the foregoing embodiments.

[0087] In some embodiments, the sensor 30 is used to collect the load signal. Exemplarily, the sensor 30 may be provided on the rotating component 11 or may be provided on the blade 420 of the impeller 400. Optionally, the sensor 30 includes at least one of a stress sensor, a strain sensor, a displacement sensor, and a load sensor.

[0088] The controller 40 can analyze the stress change of the rotating component 11 through the load signal collected by the sensor 30, so as to better adjust the magnitude of the force exerted by the non-contact bearing component on the rotating component 11 according to the load signal. The controller 40 can analyze and select the load most beneficial to the bearing structure 13 to adjust the magnitude of the force exerted by the non-contact bearing component on the rotating component 11. Exemplarily, wireless communication may be used between the sensor 30 and the controller 40.

[0089] The control method of the wind turbine in the embodiment of the present invention can determine in real time the magnitude of the stress borne by the impeller 400 on the axial direction X of the rotating member 11, and offset a part or all of the stress borne by the impeller 400 on the axial direction X of the rotating member 11 by adjusting the magnitude of the acting force exerted on the rotating member 11 by the non-contact bearing member, so as to reduce the axial force exerted by the rotating member 11 on the bearing structure 13, relieve the load borne by the bearing structure 13, and reduce the possibility of damage to the bearing structure 13 in the shafting structure 10 caused by the load borne by the impeller 400. Furthermore, it is beneficial to improve the overall service life of the bearing structure 13 and the transmission system 1, and can ensure the power generation efficiency of the wind turbine. In addition, since the bearing structure 13 does not need to bear a large axial force, the combination of bearing types in the shafting can be configured more flexibly, a bearing type with higher cost performance can be selected, or a bearing with a smaller size can be selected, thereby reducing the manufacturing cost of the wind turbine.

[0090] In some embodiments, the non-contact bearing member includes a first magnetic force member 21 and a second magnetic force member 22. The first magnetic force member 21 and the second magnetic force member 22 in this embodiment can be the first magnetic force member 21 and the second magnetic force member 22 in any of the foregoing embodiments. By adjusting the magnitude of the repulsive force between the first magnetic force member 21 and the second magnetic force member 22, a part or all of the stress borne by the impeller 400 on the axial direction X of the rotating member 11 can be offset, so as to reduce the axial force exerted by the rotating member 11 on the bearing structure 13.

[0091] In some embodiments, the non-contact bearing member may include a pneumatic member. The pneumatic member can generate a thrust force by jetting air. The acting force exerted on the rotating member 11 by the non-contact bearing member is the thrust force generated by the pneumatic member. The thrust force generated by the pneumatic member is opposite to the direction of the acting force borne by the rotating member 11. Therefore, a part or all of the acting force borne by the rotating member 11 can be offset to reduce or eliminate the axial force exerted by the rotating member 11 on the bearing structure 13, so as to relieve the load borne by the bearing structure 13.

[0092] Although the present invention has been described with reference to the preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A transmission system, characterized in that, it includes: A shafting structure, including a rotating component, a stationary component, and a bearing structure. The rotating component and the stationary component are coaxially arranged and rotatably connected through the bearing structure. The rotating component has a first end in its own axial direction, and the stationary component has a second end in the axial direction. The first end and the second end are arranged facing each other; A non-contact load-bearing component, arranged on at least one of the first end and the second end. The non-contact load-bearing component can apply a force to the rotating component to reduce the axial force exerted by the rotating component on the bearing structure along the axial direction.

2. The transmission system according to claim 1, characterized in that, the non-contact load-bearing component includes a magnetic force assembly. The magnetic force assembly includes a first magnetic component and a second magnetic component. One of the first magnetic component and the second magnetic component is arranged on the first end, and the other is arranged on the second end. The force includes the repulsive force that can be generated between the first magnetic component and the second magnetic component.

3. The transmission system according to claim 2, characterized in that, the magnitude of the repulsive force generated between the first magnetic component and the second magnetic component is adjustable.

4. The transmission system according to claim 3, characterized in that, the transmission system further includes a sensor for collecting a load signal, and the load signal is used to characterize the magnitude of the stress borne by the rotating component in the axial direction; A controller, which adjusts the magnitude of the repulsive force generated between the first magnetic component and the second magnetic component according to the load signal.

5. The transmission system according to claim 4, characterized in that, the sensor includes at least one of a stress sensor, a strain sensor, a displacement sensor, and a load sensor.

6. The transmission system according to claim 3, characterized in that, the distance between the first magnetic component and the second magnetic component is adjustable, or the magnitude of the magnetic force of the first magnetic component itself and / or the magnitude of the magnetic force of the second magnetic component itself is adjustable.

7. The transmission system according to any one of claims 2 to 6, characterized in that, the first magnetic component is arranged on the first end, the second magnetic component is arranged on the second end, the first magnetic component is a permanent magnet, and the second magnetic component is an electromagnet.

8. The transmission system according to any one of claims 2 to 6, characterized in that, the magnetic force assembly is a ring-shaped structure distributed around the rotation axis of the rotating component.

9. The transmission system according to claim 8, characterized in that, more than two of the magnetic force assemblies are distributed around the rotation axis of the rotating component. Among more than two of the first magnetic components, some of the first magnetic components are permanent magnets, and some of the first magnetic components are electromagnets, and / or, among more than two of the second magnetic components, some of the second magnetic components are permanent magnets, and some of the second magnetic components are electromagnets.

10. The transmission system according to claim 9, characterized in that, In each of the magnetic force components, one of the first magnetic force member and the second magnetic force member is a permanent magnet, and the other is an electromagnet.

11. The drive system according to claim 9, wherein, one of two adjacent first magnetic force members is a permanent magnet and the other is an electromagnet; and / or, one of two adjacent second magnetic force members is a permanent magnet and the other is an electromagnet.

12. The drive system according to any one of claims 2 to 6, wherein, along the axial direction, the orthographic projection of one of the first magnetic force member and the second magnetic force member covers the orthographic projection of the other.

13. A wind turbine generator, wherein, comprising: a nacelle; a drive system according to any one of claims 1 to 12, the stationary member being connected to the nacelle, and an impeller, being connected to the rotating member.

14. A control method for a wind turbine generator, wherein, the control method is used to control a drive system according to any one of claims 1 to 12, and the control method includes: acquiring a load signal, the load signal being used to characterize the magnitude of the stress borne by an impeller connected to the rotating member of the shafting structure in the axial direction of the rotating member; using the load signal to determine the axial force borne by the bearing structure of the shafting structure in the axial direction; adjusting the magnitude of the force applied by the non-contact load-bearing member to the rotating member according to the axial force.

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