Yaw electromagnetic damping device and yaw system of wind generating set

Abstract

The utility model provides a yaw electromagnetic damping device and a yaw system of a wind generating set, the yaw electromagnetic damping device comprises: an electromagnet arranged on one of a tower drum and a main frame; the magnetic matching piece is arranged on the other one of the tower drum and the main rack, and the electromagnet and the magnetic matching piece can form magnetic attraction and / or repulsion in a power-on state; the power supply device is electrically connected with the electromagnet and can provide current for the electromagnet; and the control device is in signal connection with the power supply device and can control the output current of the power supply device. According to the yaw electromagnetic damping device provided by the embodiment of the invention, hydraulic oil leakage and dust cannot be generated, and environmental protection is facilitated; the friction plate or the sliding pad does not need to be replaced in the life cycle of the unit, so that the workload of the maintenance personnel is reduced, and the operation and maintenance cost is reduced; damage to the large yaw gear ring and the yaw motor can be reduced, and consumption of spare parts of a unit is reduced.

Description

Technical Field

[0001] This disclosure relates to the field of wind power generation technology, specifically to a yaw electromagnetic damping device and a yaw system for a wind turbine generator set. Background Technology

[0002] The yaw system of wind turbines generally uses a yaw motor and a drive to drive the yaw gear. In order to avoid the alternating load on the yaw gear caused by frequent changes in wind direction, a yaw brake or a sliding damper is used to absorb the small free yaw oscillations and prevent the alternating stress of the yaw gear from causing premature damage to the gear.

[0003] However, the use of yaw hydraulic brakes or sliding dampers will result in wear of friction plates or sliding pads, generating dust pollution in the environment. Furthermore, once the friction plates or sliding pads wear down to the specified thickness, they need to be replaced, which consumes materials and is time-consuming and difficult to replace. Utility Model Content

[0004] The main objective of this disclosure is to provide a yaw electromagnetic damping device and a yaw system for wind turbine generator sets, in order to solve the problem of wear of friction plates or sliding pads in the yaw hydraulic brakes or sliding dampers of wind turbine generator sets in the related art.

[0005] To achieve the above objectives, a first aspect of this disclosure provides a yaw electromagnetic damping device for a wind turbine generator set. The wind turbine generator set includes a tower and a main frame. The yaw electromagnetic damping device includes: an electromagnet disposed on one of the tower and the main frame; a magnetic mating component disposed on the other of the tower and the main frame, wherein the electromagnet is capable of magnetic attraction and / or repulsion with the magnetic mating component when energized; a power supply device electrically connected to the electromagnet and capable of providing current to the electromagnet; and a control device signal connected to the power supply device and capable of controlling the output current of the power supply device.

[0006] In some embodiments, the magnetic mating component includes at least one of a magnetic component, a permanent magnet, and a mating electromagnet.

[0007] In some embodiments, the magnetic mating component includes a magnetic element disposed on the tower, and an electromagnet disposed on the main frame. The electromagnet is capable of generating magnetic force to attract the magnetic element when energized.

[0008] In some embodiments, a yaw gear ring is provided on the tower, and a magnetic mating component is provided on the yaw gear ring. The yaw electromagnetic damping device further includes an insulating pad, which is provided between the yaw gear ring and the magnetic mating component to separate the yaw gear ring and the magnetic mating component.

[0009] In some embodiments, the yaw electromagnetic damping device further includes: a bracket, one end of which is connected to the main frame, and an electromagnet is disposed on the other end of the bracket; the electromagnet includes an iron core and a coil, the coil being wound around the iron core, the iron core being a block shape with an opening, the yaw gear ring extending into the iron core through the opening, insulating pads and magnetic mating parts being disposed on both opposite sides of the yaw gear ring, and the coil being disposed at a position that mates with the magnetic mating parts.

[0010] In some embodiments, the yaw electromagnetic damping device further includes: a fastener, the fastener including a fastening head and a fastening rod, the fastening rod passing through an insulating pad and a magnetic mating member and locking onto the yaw gear ring; an isolation pad disposed between the fastening head and the magnetic mating member to insulate and isolate the fastening head and the magnetic mating member; and an insulating sleeve sleeved on the fastening rod, the insulating sleeve being located on the fastening rod at a position corresponding to the magnetic mating member.

[0011] In some embodiments, the power supply device includes an electrically connected power supply and a frequency converter with variable frequency damping. The frequency converter with variable frequency damping is connected to an electromagnet cable and is capable of supplying current to the electromagnet.

[0012] In some embodiments, the control device includes a main controller, which is connected to the frequency converter with variable frequency damping and is capable of controlling the output current of the frequency converter with variable frequency damping.

[0013] In some embodiments, the control device further includes a yaw current transformer and a yaw speed sensor. The main controller is signal-connected to the yaw current transformer and the yaw speed sensor. The yaw speed sensor can measure the yaw speed, and the yaw current transformer can measure the current of the yaw motor during yaw.

[0014] A second aspect of this disclosure provides a yaw system for a wind turbine generator set, comprising: a yaw motor for driving the wind turbine generator set to yaw; and a yaw electromagnetic damping device as described in any of the above embodiments, wherein the yaw motor is signal-connected to the yaw electromagnetic damping device.

[0015] The yaw system of the wind turbine generator provided in this disclosure has the yaw electromagnetic damping device of any of the above embodiments, and thus has the beneficial effects of any of the above embodiments, which will not be described in detail here.

[0016] The yaw electromagnetic damping device provided in this embodiment generates magnetic force during the yaw process of the unit, providing damping to cope with the alternating stress on the yaw gear caused by wind direction. The electromagnet and the magnetic mating component do not contact each other; damping is provided through magnetic force via the interaction between the electromagnet and the magnetic mating component. The yaw frequency conversion electromagnetic damping device does not directly contact the yaw gear ring, resulting in no wear, no dust generation, and no need for replacement. Furthermore, during yaw, the frequency converter can maintain a constant output damping or adjust the yaw damping magnitude according to the yaw feedback torque, preventing overload of the yaw gear ring teeth and yaw motor, thus avoiding damage to these components. The yaw electromagnetic damping device provided in this embodiment does not generate dust, which is beneficial to environmental protection. It is also beneficial to current unit maintenance personnel, as friction plates or sliding pads do not need to be replaced during the unit's lifespan, reducing maintenance workload and thus lowering operating costs. It can reduce damage to the yaw gear ring and yaw motor, lowering the unit's spare parts consumption.

[0017] Other aspects and / or advantages of the present invention will be set forth in part in the description which follows, and in part will be clear from the description or may be learned by practice of the present invention. Attached Figure Description

[0018] The above and other objects and features of the present invention will become clearer from the following description, taken in conjunction with the accompanying drawings, which exemplarily illustrate an example, wherein:

[0019] Figure 1 This is a cross-sectional structural schematic diagram of a yaw electromagnetic damping device according to an embodiment of the present invention;

[0020] Figure 2 This is another cross-sectional view of a yaw electromagnetic damping device according to an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of a yaw electromagnetic damping device according to an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the structural connection of a yaw system according to an embodiment of the present invention;

[0023] Figure 5 This is a flowchart illustrating a yaw system according to an embodiment of the present invention.

[0024] Figures 1 to 5 Explanation of reference numerals in the attached figures:

[0025] 10 Electromagnet, 110 Iron Core, 111 Opening, 120 Coil, 130 Fastener, 140 Isolation Pad

[0026] 20 magnetic components,

[0027] 30 insulating pad,

[0028] 40 supports,

[0029] 50 Power supply unit, 510 Power supply, 520 Variable frequency drive with damping, 530 Cables

[0030] 60 Control device, 610 Main controller, 620 Yaw current transformer, 630 Yaw speed sensor.

[0031] 70 yaw motor,

[0032] 80 yaw gear ring,

[0033] 90 mainframe rack. Detailed Implementation

[0034] The following detailed embodiments are provided to aid the reader in gaining a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will become apparent upon understanding this disclosure. For example, the order of operations described herein is merely illustrative and is not limited to those orders set forth herein, but may be changed as will become clear upon understanding this disclosure, except for operations that must occur in a specific order. Furthermore, for clarity and conciseness, descriptions of features known in the art may be omitted.

[0035] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein, which will become clear upon understanding the disclosure of this application.

[0036] Although terms such as “first” and “second” may be used herein to describe various components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts should not be limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teaching of the examples described herein, the first component, first assembly, first region, first layer, or first part referred to as the first component, first assembly, first region, first layer, or first part may also be referred to as the second component, second assembly, second region, second layer, or second part.

[0037] In the specification, when an element such as a layer, region, or substrate is described as being "on" another element, "connected to," or "bonded to" another element, the element may be directly "on" another element, directly "connected to," or "bonded to" the other element, or one or more other elements may be present in between. Conversely, when an element is described as being "directly on" another element, "directly connected to," or "directly bonded to" another element, no other elements may be present in between.

[0038] The terminology used herein is for the purpose of describing various examples only and is not intended to limit disclosure. Unless the context clearly indicates otherwise, the singular form is intended to include the plural form as well. The terms “comprising,” “including,” and “having” indicate the presence of the described features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof. The term “a plurality” represents any quantity of two or more.

[0039] The directional terms such as "upper," "lower," "top," and "bottom" used in this application are all based on the orientation of the product when it is in normal use.

[0040] Unless otherwise defined, all terms used herein, including technical and scientific terms, shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains after understanding the invention. Unless expressly defined herein, terms such as those defined in a general dictionary shall be interpreted as having a meaning consistent with their meaning in the context of the relevant field and in this invention, and shall not be interpreted in an idealized or overly formalistic manner.

[0041] Furthermore, in the description of the examples, detailed descriptions of well-known related structures or functions will be omitted when it is believed that such detailed descriptions would lead to a vague interpretation of the present invention.

[0042] In related technologies, the yaw system of wind turbines generally uses a yaw motor and a drive to drive the yaw gear. In order to avoid the alternating load on the yaw gear caused by frequent changes in wind direction, a yaw brake or a sliding damper is used to absorb the small free yaw oscillations and prevent the alternating stress of the yaw gear from causing premature gear damage.

[0043] The yaw brakes in related technologies are mainly hydraulic brakes. Under the action of the hydraulic system, the brake's friction pads clamp the yaw gear ring. The friction between the friction pads and the yaw gear ring absorbs the alternating stress of the yaw gear. The friction between the friction pads and the yaw gear ring can be adjusted by changing the hydraulic pressure. During yaw, the electromagnetic brake of the yaw motor opens, and the hydraulic brake reduces pressure, decreasing the friction between the yaw gear ring and the friction pads. The yaw motor then overcomes friction and external wind loads to yaw. When facing the wind, the electromagnetic brake of the yaw motor engages, while the hydraulic brake increases pressure for braking.

[0044] The yaw sliding damper in related technologies is mainly a yaw caliper, which is a mechanical disc structure. The base is positioned on the yaw gear ring via a sliding pad. The yaw gear ring adjusts the friction between the sliding pad and the yaw gear ring by pre-tightening the lower sliding pad. During yaw, the yaw motor electromagnetic brake is activated, and the yaw motor overcomes the friction between the sliding pad and the yaw gear ring and external wind load to yaw. After facing the wind direction, the yaw motor stops rotating, and the yaw motor electromagnetic brake engages, braking the entire unit.

[0045] However, the use of yaw hydraulic brakes or sliding dampers will result in wear of friction plates or sliding pads, generating dust pollution in the environment. Furthermore, once the friction plates or sliding pads wear down to the specified thickness, they need to be replaced, which consumes materials and is time-consuming and difficult to replace.

[0046] Alternatively, permanent magnets can be installed on the tower to generate magnetic force directly on the tooth surface of the yaw gear ring, serving as yaw damping. However, the magnetic force in this method cannot be adjusted.

[0047] A yaw damping motor can also be used to absorb small free yaw oscillations. During yaw, the damping motor contacts the tooth surface of the yaw gear ring to provide a reverse force to provide damping and maintain damping during yaw.

[0048] However, when using permanent magnet dampers and yaw damping motors, the tooth surface of the yaw gear ring will be subjected to a large reaction force, which can easily lead to damage to the tooth surface of the yaw gear ring and the yaw motor.

[0049] To address the issues of dust pollution caused by wear of friction plates or sliding pads in the aforementioned yaw hydraulic brakes or sliding dampers, and the resource consumption, labor-intensive, and difficult replacement of worn friction plates or sliding pads, this application provides a yaw electromagnetic damping device, which will be described below in conjunction with... Figures 1 to 5 This invention introduces a yaw electromagnetic damping device and a yaw system for a wind turbine generator set, provided by embodiments of the present invention.

[0050] like Figure 1 , Figure 2 and Figure 3 As shown, a first aspect of this disclosure provides a yaw electromagnetic damping device for a wind turbine generator set. The wind turbine generator set includes a tower and a main frame 90. The yaw electromagnetic damping device includes: an electromagnet 10, disposed on one of the tower and the main frame 90; a magnetic mating member, disposed on the other of the tower and the main frame 90, wherein the electromagnet 10 is capable of magnetic attraction and / or repulsion with the magnetic mating member when energized; a power supply device 50, electrically connected to the electromagnet 10, capable of providing current to the electromagnet 10; and a control device 60, signal-connected to the power supply device 50, capable of controlling the output current of the power supply device 50.

[0051] The yaw electromagnetic damping device provided in this embodiment is used to generate magnetic force during the yaw process of the unit, providing damping to cope with the alternating stress on the yaw gear caused by the wind direction. The electromagnet 10 does not contact the magnetic mating part. Through the cooperation between the electromagnet 10 and the magnetic mating part, damping can be provided by magnetic force. The yaw frequency conversion electromagnetic damping device does not directly contact the yaw large gear ring 80, so there is no wear, no dust generation, and no need for replacement. Furthermore, during the yaw process, the frequency conversion damping inverter 520 can maintain a constant output damping, or adjust the yaw damping according to the magnitude of the yaw feedback torque, so as not to cause overload on the tooth surface of the yaw large gear ring 80 and the yaw motor 70, thereby preventing damage to the tooth surface of the yaw large gear ring 80 and the yaw motor 70. The yaw electromagnetic damping device provided in this embodiment will not produce hydraulic oil leakage or dust, which is beneficial to environmental protection. It is also beneficial to the current maintenance personnel of the unit, as the friction plates or sliding pads do not need to be replaced during the unit's life cycle, reducing the workload of maintenance personnel and thus reducing operation and maintenance costs. It can reduce the damage to the yaw ring gear 80 and the yaw motor 70, and reduce the consumption of spare parts for the unit.

[0052] In some embodiments, the magnetic mating component includes at least one of a magnetic element 20, a permanent magnet, and a mating electromagnet 10. The magnetic element 20, the permanent magnet, and the mating electromagnet 10 can all interact with the electromagnet 10, generating attractive and / or repulsive forces between them, thereby adjusting the yaw damping between the tower and the main frame 90 through the attractive and / or repulsive forces between them.

[0053] In some embodiments, such as Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the magnetic coupling includes a magnetic element 20, which is mounted on the tower. An electromagnet 10 is mounted on the main frame 90. The electromagnet 10 generates a magnetic force to attract the magnetic element 20 when energized. Thus, since the magnetic element 20 does not require energization, there is no need for an additional energizing device on the tower, simplifying the structure of the yaw electromagnetic damping device. Furthermore, the magnetic element 20 and the electromagnet 10 mounted on the main frame 90 can interact to generate an attractive force, making it easier to adjust the yaw damping between the tower and the main frame 90 by controlling the magnetic force of the electromagnet 10.

[0054] In some embodiments, the magnetic component 20 is an object capable of interacting with a magnet or electromagnet 10. The magnetic component 20 typically includes metals such as iron, cobalt, and nickel, and their alloys, because they are ferromagnetic and can be attracted by a magnet, generating magnetism. When these magnetic materials approach a magnet, they are affected by the magnet's magnetic field, resulting in magnetic induction. This causes the magnetic moments within the material to align, forming magnetic poles opposite to those of the magnet, thus generating an attractive force. Further, the magnetic component 20 can specifically be an iron ring, iron sheet, etc., which can cooperate with the electromagnet 10 without electricity, and iron products are relatively common and inexpensive.

[0055] In some embodiments, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a yaw gear ring 80 is installed on the tower, and a magnetic mating component is installed on the yaw gear ring 80. The yaw electromagnetic damping device also includes an insulating gasket 30, which is placed between the yaw gear ring 80 and the magnetic mating component to separate them. With this configuration, the yaw gear ring 80 in the wind turbine generator is an important component of the yaw system, and its main function is to support the nacelle and yaw reducer to achieve the nacelle's windward rotation. The yaw gear ring 80 is usually fixed to the tower flange and achieves yaw action by meshing with the yaw pinion. Furthermore, the insulating gasket 30 serves to fix the magnetic mating component, securing it to the yaw gear ring 80 and ensuring mutual insulation between them.

[0056] In some embodiments, such as Figure 1 , Figure 2 and Figure 4As shown, the yaw electromagnetic damping device further includes: a bracket 40, one end of the bracket 40 is connected to the main frame 90, and the electromagnet 10 is disposed at the other end of the bracket 40; the electromagnet 10 includes an iron core 110 and a coil 120, the coil 120 is wound around the iron core 110, the iron core 110 is in a block shape with an opening 111, and the yaw large gear ring 80 extends into the iron core 110 through the opening 111. Insulating gaskets 30 and magnetic matching members are provided on both opposite surfaces of the yaw large gear ring 80, and the coil 120 is disposed at a position matching the magnetic matching member. Thus, the electromagnet 10 is installed through the bracket 40, which is more conducive to installing the electromagnet to a position close to the magnetic matching member; further, the iron core 110 is in a block shape with an opening 111. Specifically, the iron core 110 is in a U shape, and coils 120 are wound around the upper and lower horizontal portions of the U shape. The yaw large gear ring 80 is located inside the U-shaped iron core 110, and magnetic matching members are provided on the upper and lower side walls of the yaw large gear ring 80, thereby forming two sets of electromagnets 10 and magnetic matching members up and down, making the magnetic attraction force between the yaw large gear ring 80 and the main frame 90 stronger.

[0057] In some embodiments, as Figure 2 shown, the magnetic matching member is an annular iron ring, and a plurality of electromagnets 10 are spaced along the circumferential direction of the annular iron ring. The electromagnet 10 is sleeved on the annular iron ring from one end with the opening 111. Thus, the electromagnet 10 can uniformly generate a suction force on the annular iron ring in the circumferential direction, making the force between the two uniform.

[0058] In some embodiments, as Figure 1 shown, the yaw electromagnetic damping device further includes: a fastener 130, the fastener 130 includes a fastening head and a fastening rod, the fastening rod penetrates through the insulating gasket 30, the magnetic matching member and is locked on the yaw large gear ring 80; an isolation pad 140 is disposed between the fastening head and the magnetic matching member to insulate and isolate the fastening head and the magnetic matching member; an insulating sleeve is sleeved on the fastening rod, and the insulating sleeve is located at a position on the fastening rod corresponding to the magnetic matching member. With such a setting, the insulating gasket 30, the magnetic matching member and the yaw large gear ring 80 are connected through the fastener 130, the connection structure is simple and the connection is stable; specifically, an isolation pad 140 is disposed between the fastening head and the magnetic matching member of the fastener 130 for insulation, and an insulating sleeve is sleeved on the fastening rod at a position corresponding to the magnetic matching member to play a role in insulating and isolating the magnetic matching member and the fastening rod.

[0059] In some embodiments, by way of example, optionally, the fastener 130 can be a bolt, a screw, a screw rod, etc.

[0060] In some embodiments, as Figure 1As shown, the bracket 40 and the iron core 110 are also connected by fasteners 130, isolation pads 140 and insulating sleeves. Specifically, the fastening rod of the fastener 130 passes through the iron core 110 and is fastened in the bracket 40. Isolation pads 140 are provided between the iron core 110 and the fastening head and between the iron core 110 and the bracket 40 to play an isolation role. An insulating sleeve is fitted on the fastening rod at the position corresponding to the iron core 110 to insulate the iron core 110 and the fastening rod.

[0061] In some embodiments, such as Figure 4 As shown, the power supply device 50 includes a power supply 510 and a frequency converter 520 electrically connected to each other. The frequency converter 520 is connected to the electromagnet 10 via a cable 530, and can supply current to the electromagnet 10. With this configuration, the frequency converter 520 can supply current to the coil 120. By changing the output current of the frequency converter 520, the magnetic force generated by the electromagnet 10 can be adjusted. Increasing the output current increases the attraction between the electromagnet 10 and the magnetic mating component, while decreasing the output current reduces the attraction between the electromagnet 10 and the magnetic mating component, thereby maintaining appropriate yaw speed and yaw damping for the entire unit during operation. Furthermore, the power supply 510 can supply power to the frequency converter 520.

[0062] like Figure 4 As shown, in some embodiments, the control device 60 includes a main controller 610, which is signal-connected to the variable frequency damping inverter 520. The main controller 610 can control the output current of the variable frequency damping inverter 520. With this configuration, the main controller 610 can send control commands to the variable frequency damping inverter 520, thereby controlling the output current of the variable frequency damping inverter 520.

[0063] like Figure 4 As shown, in some embodiments, the control device 60 further includes a yaw current transformer 620 and a yaw speed sensor 630. The main controller 610 is signal-connected to the yaw current transformer 620 and the yaw speed sensor 630. The yaw speed sensor 630 can measure the yaw speed, and the yaw current transformer 620 can measure the current of the yaw motor 70 during yaw. With this configuration, the main controller 610 receives the current of the yaw motor 70 during yaw from the yaw current transformer 620 and the yaw speed from the yaw speed sensor 630, calculates the yaw speed and yaw damping, and sends control commands to the variable frequency damping inverter 520, thereby more accurately controlling the output current of the variable frequency damping inverter 520.

[0064] Specifically, the main controller 610 calculates the yaw speed and the damping during the yaw process. When the unit needs to maintain a stable yaw speed and change the yaw damping, the main controller 610 sends a command to the variable frequency damping inverter 520. The variable frequency damping inverter 520 adjusts the output current according to the main controller command, increasing the output current to increase the attraction between the electromagnet 10 and the iron ring, or decreasing the output current to reduce the attraction between the electromagnet 10 and the iron ring, so that the entire unit maintains a suitable yaw speed and yaw damping during operation.

[0065] A second aspect of this disclosure provides a yaw system for a wind turbine generator set, comprising: a yaw motor 70 for driving the wind turbine generator set to yaw; and a yaw electromagnetic damping device as described in any of the above embodiments, wherein the yaw motor 70 is signal-connected to the yaw electromagnetic damping device.

[0066] The yaw system of the wind turbine generator provided in this disclosure has the yaw electromagnetic damping device of any of the above embodiments, and thus has the beneficial effects of any of the above embodiments, which will not be described in detail here.

[0067] The following is combined with Figure 5 The working principle and logic of the yaw system of a wind turbine generator set are explained in detail. Figure 5 An example diagram of the working logic of the yaw system of a wind turbine generator is shown, such as... Figure 5As shown, during actual operation, the main controller 610 of the unit issues a yaw command. The yaw command first reaches the variable frequency damping inverter 520, which outputs current. At this time, current flows through the coil 120 of the yaw electromagnetic damping device. Through the reinforcing effect of the iron core 110, the electromagnet 10 formed by the coil 120 and the iron core 110 generates a sufficiently strong magnetic force. The electromagnet 10, composed of the coil 120 and the iron core 110, will attract the iron ring due to the magnetic force generated, creating a strong attraction between the two. The electromagnetic brake of the yaw motor 70 is activated, and the yaw motor 70 drives the entire unit to yaw. Since the yaw gear ring 80 set on the tower is fixed, when the unit yaws, there will be relative movement between the entire main frame 90 of the unit and the yaw gear ring 80. That is, there will be relative movement between the electromagnet 10, composed of the iron core 110 and the coil 120, and the iron ring. At this time, the yaw motor 70 must overcome the attraction between the electromagnet 10 and the iron ring. Similarly, when the load of external wind acts on the unit, causing alternating loads on the yaw gear, the attraction between the electromagnet 10 and the iron ring is used to counteract these alternating loads. The yaw speed sensor 630 measures the yaw speed of the yaw action and sends it to the main controller 610. The current transformer of the yaw motor 70 measures the current of the yaw motor 70 and feeds it back to the main controller 610. The main controller 610 calculates the yaw speed and the damping during the yaw process. When the unit needs to maintain a stable yaw speed and change the yaw damping, the main controller 610 sends a command to the variable frequency damping inverter 520. The variable frequency damping inverter 520 adjusts the output current according to the main control command, increasing the output current to increase the attraction between the electromagnet 10 and the iron ring, or decreasing the output current to decrease the attraction between the electromagnet 10 and the iron ring, thereby enabling the entire unit to maintain a suitable yaw speed and yaw damping during operation. When the yaw reaches the specified angle, the yaw motor 70 stops operating, the electromagnetic brake of the yaw motor 70 is turned off, braking the entire unit. The frequency converter 520 is turned off and no longer outputs current. The magnetic force of the electromagnet 10 composed of coil 120 and iron core 110 disappears, the attraction between the electromagnet 10 and the iron ring disappears, the yaw electromagnetic damper stops working, and the yaw stops.

[0068] It is worth noting that the yaw gear is usually driven by the yaw motor 70, which converts high-speed rotation into low-speed, high-torque output through a reducer, thereby driving the yaw ring gear 80 to rotate.

[0069] Yaw gear 80: Usually fixed to the top of the tower and secured with bolts, it cannot rotate. The pinion rotates around the large gear ring, driving the nacelle to rotate.

[0070] While the embodiments of the present invention have been described in detail above, those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope thereof. It should be understood that, to those skilled in the art, these modifications and variations will still fall within the spirit and scope of the embodiments of the present invention as defined in the claims.

Claims

1. A yaw electromagnetic damping device for a wind turbine generator set, the wind turbine generator set comprising a tower and a main frame (90), characterized in that, The yaw electromagnetic damping device includes: An electromagnet (10) is mounted on one of the tower and the main frame (90); A magnetic mating component is disposed on the other of the tower and the main frame (90), and the electromagnet (10) is capable of forming a magnetic attraction and / or repulsion with the magnetic mating component when energized; The power supply device (50) is electrically connected to the electromagnet (10) and is able to provide current to the electromagnet (10); A control device (60) is signal-connected to the power supply device (50), and the control device (60) is capable of controlling the output current of the power supply device (50).

2. The yaw electromagnetic damping device according to claim 1, characterized in that, The magnetic mating component includes at least one of a magnetic component (20), a permanent magnet, and a mating electromagnet (10).

3. The yaw electromagnetic damping device according to claim 2, characterized in that, The magnetic mating component includes a magnetic component (20), which is disposed on the tower. The electromagnet (10) is disposed on the main frame (90). The electromagnet (10) can generate magnetic force to attract the magnetic component (20) when energized.

4. The yaw electromagnetic damping device according to claim 1, characterized in that, The tower is provided with a yaw gear ring (80), the magnetic fitting is provided on the yaw gear ring (80), and the yaw electromagnetic damping device further includes: An insulating pad (30) is disposed between the yaw gear ring (80) and the magnetic mating member to separate the yaw gear ring (80) and the magnetic mating member.

5. The yaw electromagnetic damping device according to claim 4, characterized in that, The yaw electromagnetic damping device also includes: A bracket (40) is provided, one end of which is connected to the main frame (90), and the electromagnet (10) is provided on the other end of the bracket (40). The electromagnet (10) includes an iron core (110) and a coil (120). The coil (120) is wound around the iron core (110). The iron core (110) is a block with an opening (111). The yaw gear ring (80) extends into the iron core (110) through the opening (111). The insulating pad (30) and the magnetic mating member are provided on both opposite sides of the yaw gear ring (80). The coil (120) is located at a position that mates with the magnetic mating member.

6. The yaw electromagnetic damping device according to claim 4, characterized in that, The yaw electromagnetic damping device also includes: Fastener (130), the fastener (130) includes a fastening head and a fastening rod, the fastening rod passing through the insulating gasket (30), the magnetic mating member and locking onto the yaw gear ring (80); An isolation pad (140) is disposed between the fastening head and the magnetic mating member to insulate and isolate the fastening head and the magnetic mating member; An insulating sleeve is fitted onto the fastening rod, and the insulating sleeve is located on the fastening rod at a position corresponding to the magnetic mating component.

7. The yaw electromagnetic damping device according to any one of claims 1 to 6, characterized in that, The power supply device (50) includes an electrically connected power supply (510) and a frequency converter (520) with variable frequency damping. The frequency converter (520) is connected to the electromagnet (10) cable (530) and can provide current to the electromagnet (10).

8. The yaw electromagnetic damping device according to claim 7, characterized in that, The control device (60) includes a main controller (610), which is connected to the variable frequency damping inverter (520) by signal. The main controller (610) can control the output current of the variable frequency damping inverter (520).

9. The yaw electromagnetic damping device according to claim 8, characterized in that, The control device (60) further includes a yaw current transformer (620) and a yaw speed sensor (630). The main controller (610) is signal-connected to the yaw current transformer (620) and the yaw speed sensor (630). The yaw speed sensor (630) can measure the yaw speed, and the yaw current transformer (620) can measure the current of the yaw motor (70) during yaw.

10. A yaw system for a wind turbine generator set, characterized in that, include: Yaw motor (70) is used to drive the wind turbine generator set to yaw; The yaw electromagnetic damping device as described in any one of claims 1 to 9, wherein the yaw motor (70) is signal-connected to the yaw electromagnetic damping device.

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