Offshore wind power full seal electromagnetic brake

Abstract

The utility model relates to an offshore wind power full sealing electromagnetic brake relates to electromagnetic brake technical field for solving the technical problem that the rotor assembly of electromagnetic brake cannot be automatically reset when the existing motor is vertically installed, the utility model discloses a kind of offshore wind power full sealing electromagnetic brake, the inside of stator shell is equipped with coil framework, and coil framework is wound with electromagnetic wire;Stator shell has spring hole, and compression spring is inlaid in spring hole, and the other end of compression spring is in contact with the side of armature, armature is penetrated by hollow pin, and hollow pin connects stator shell;Two friction plates are respectively bonded in the two sides of cast aluminum rotor, and cast aluminum rotor is connected by spline with spline sleeve, and spline sleeve is installed on motor shaft;Two other sides of two friction plates are respectively in contact with armature and the side of flange plate, and the surface of the side of flange plate close to friction plate is equipped with U-shaped groove;The other side of flange plate is equipped with outer stop, and outer stop has annular groove, and second O-ring is contained in annular groove.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic brakes, and in particular to a fully sealed electromagnetic brake for offshore wind power generation, more particularly to a fully sealed electromagnetic brake capable of returning a rotor assembly to its original position. Background Art

[0002] Electromagnetic power-off brakes are the most common and widely used type of brake, used in a variety of sectors including nuclear power, wind power, automotive, smelting, elevators, hoisting, and transportation. Therefore, the market for electromagnetic brakes is vast and diverse. In the wind power sector, wind power generation remains one of the main development directions of my country's new energy industry. However, as onshore wind power capacity gradually reaches saturation, the vast ocean presents the next stage for wind power development. High-torque, fully sealed electromagnetic brakes for offshore wind turbines are essential and frequently used safety control components for individual wind turbines, and their market demand is growing with the rise of the wind power industry. Therefore, the research and development of wind power yaw electromagnetic brakes is urgent.

[0003] The high-torque, fully sealed electromagnetic brake of an offshore wind turbine is an essential component of the yaw mechanism, a unique feature of wind turbines. The yaw drive actively aligns the nacelle with the wind, ensuring the blades capture the most wind energy. The yaw mechanism of a wind turbine consists of a yaw motor, yaw reducer, yaw bearing, yaw caliper, hydraulic components, soft starter, and encoder. The yaw motor, as the power unit of the yaw system, plays a crucial role, while the electromagnetic brake used by the yaw motor is one of its most important components. The electromagnetic brake and the yaw motor start and stop are synchronized. In recent years, with the advancement of wind turbine control technology, numerous intelligent control strategies for yaw systems have emerged. Advanced control algorithms enable early prediction and identification of wind loads, enabling the electromagnetic brake to effectively execute yaw or braking actions. To effectively implement the various control strategies of these advanced control algorithms, the design of the yaw motor and its electromagnetic brake is crucial.

[0004] When wind turbines operate at sea under complex operating conditions such as severe salt spray corrosion and high impact loads, conventional electromagnetic brakes fail to meet their requirements. This is primarily due to outdated manufacturing processes, substandard quality and variety of key materials, inadequate research and design, low investment in R&D, a lack of funding for new product development, and weak technological innovation capabilities. The current overall goal is to design a high-torque, fully sealed product suitable for normal operation in marine environments, based on market demand. This will improve the reliability of wind turbine yaw systems while also meeting the wind power industry's brake lifespan requirements, enhancing product quality, and reducing overall machine operating noise.

[0005] In other words, the existing technology mainly has the following defects:

[0006] (1) Most existing electromagnetic brakes are open structures with poor waterproof and dustproof performance. Occasionally, there are a few fully sealed structures, but the locations of the mounting bolts and brake handles make it easy for water, oil, gas, etc. to penetrate through the mounting bolts and other parts;

[0007] (2) Existing fully sealed brakes are all large and bulky structures with low electrical efficiency and larger axial dimensions than open structures. They cannot meet the requirements in places with strict requirements on axial installation dimensions.

[0008] (3) Most of the existing electromagnetic brake cast aluminum rotor structures are "L"-shaped, with weak load-bearing and impact resistance capabilities, large size and weight, and require a large installation space;

[0009] (4) Most of the existing electromagnetic brakes and the rear end cover of the motor use a friction plate made by stamping technology. The flatness of the friction plate is difficult to control, which will directly affect the brake noise and service life.

[0010] Therefore, how to provide a fully sealed electromagnetic brake for offshore wind power generation, which adopts a special fully sealed structural design, can increase the internal sealing performance of the brake, make the protection level reach IP65, and effectively improve the surface corrosion resistance of the product, while making it still provide a larger brake torque in a smaller size, and increase the use range of different torques of the same machine size, reduce the brake selection, and reduce the cost of opening multiple brake manufacturing lines, has become a technical problem that technical personnel in this field urgently need to solve. Summary of the Invention

[0011] The purpose of the present invention is to provide a fully sealed electromagnetic brake for offshore wind power generation, which is used to solve the technical problem that the rotor assembly of the electromagnetic brake cannot be automatically reset when the existing motor is installed vertically. It can prevent the friction plate under the rotor from rubbing against the mating part for a long time, thereby effectively reducing the brake noise and increasing the service life of the brake, and at the same time improving the overall quality of the electromagnetic brake during use.

[0012] In order to achieve the above object, the present invention adopts the following technical solutions:

[0013] A fully sealed electromagnetic brake for offshore wind power generation, comprising: a stator housing injected with sealant, a coil skeleton assembled inside the stator housing, and an electromagnetic wire wound around the coil skeleton; the stator housing has a spring hole, a compression spring is embedded in the spring hole, and the other end of the compression spring contacts one side of the armature, the armature is penetrated by a hollow pin, and the hollow pin is connected to the stator housing; two friction plates are respectively bonded to both sides of a cast aluminum rotor, the cast aluminum rotor is connected to a spline sleeve through a spline, and the spline sleeve is installed on the motor shaft; the other two sides of the two friction plates are respectively in contact with the armature and one side of the flange, and the The flange is provided with a U-shaped groove on one side of the surface close to the friction plate, and the U-shaped groove is used to accommodate particles dropped by the friction plate after friction; the other side of the flange is provided with an outer stop, and the outer stop is used to form an overfit with the motor end cover, and at the same time, the outer stop of the flange is provided with an annular groove, and the annular groove accommodates a second O-ring; the brake is fixed to the rear end cover of the motor by a long screw through a threaded connection, and the connection between the long screw and the stator housing is sealed by two first O-rings, and the stator housing has a stop step for accommodating the first O-ring for sealing and protecting the first O-ring.

[0014] In actual application, the hexagonal handle bolt is connected to the handle assembly of the brake through the handle spring, and the handle bolt is connected to the armature through the stator housing. At the same time, a third O-ring is used to seal the bolt connection with the stator housing. By pulling the handle assembly, the attraction and release of the armature can be manually controlled.

[0015] Wherein, the outer surface of the stator housing adopts streamlined axial heat dissipation ribs.

[0016] Specifically, the height of the stop step is 1.3 mm.

[0017] Furthermore, the diameter of the electromagnetic wire is φ0.27.

[0018] Furthermore, the handle bolt is configured with a hexagonal nut, and the hexagonal nut is provided with a flat washer.

[0019] Furthermore, the motor shaft is provided with a skeleton oil seal.

[0020] Compared with the prior art, the fully sealed electromagnetic brake for offshore wind power generation described in the present invention has the following advantages:

[0021] In the fully sealed electromagnetic brake for offshore wind power generation provided by the present invention, the brake mounting bolts and handle bolts respectively adopt standard threads of M8 and M5, and the bolt flanges are respectively provided with two sealing rings with a wire diameter of φ1.8. A stop step for accommodating the O-ring is designed at the connection between the brake bolt mounting hole and the handle bolt, which not only plays a sealing role, but also effectively prevents the O-ring from being damaged due to excessive preload force when the customer installs the brake, and at the same time effectively prevents the mounting bolt from loosening; and an O-ring seal is also designed at the junction of the brake flange stop and the stator housing; in addition, compared with existing brakes of the same model, the height of this brake is shortened from 80mm to 70mm and the weight is reduced by 10%; the diameter of the electromagnetic wire is increased, thereby effectively reducing the electrical power of the entire machine, increasing the electrical efficiency by 3%, and reducing the current by 5%; and the stator electromagnetic force is increased, ensuring that after the friction plate is worn out due to long-term operation, the armature can still be attracted when the air gap reaches 0.8mm, thereby extending the service life of the brake. From this analysis, it can be seen that the fully sealed electromagnetic brake for offshore wind power generation provided by the present invention adopts a special fully sealed structural design, which can increase the internal sealing performance of the brake, so that the protection level reaches IP65, and effectively improve the surface corrosion resistance of the product. At the same time, it can still provide a larger brake torque under a smaller external size, and increase the use range of different torques of the same machine size, reduce the brake selection, and reduce the cost of opening multiple brake manufacturing lines; and, since a compression spring is embedded in the spring hole of the stator housing, and the other end of the compression spring contacts one side of the armature, the armature is penetrated by a hollow pin, The hollow pin is connected to the stator housing; the two friction plates are respectively bonded to both sides of the cast aluminum rotor, the cast aluminum rotor is connected to the spline sleeve through a spline, and the spline sleeve is installed on the motor shaft; the other two sides of the two friction plates are respectively in contact with the armature and one side of the flange, and the surface of the flange close to the friction plate is provided with a U-shaped groove, which can be used to accommodate particles dropped by the friction plate due to friction. Therefore, this electromagnetic brake can prevent the friction plate under the rotor from rubbing against the dual part for a long time, thereby effectively reducing the brake noise and increasing the service life of the brake, and at the same time it can also improve the overall quality of the electromagnetic brake during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic cross-sectional view of the fully sealed electromagnetic brake for offshore wind power generation provided by an embodiment of the present invention from a first perspective;

[0023] Figure 2 A schematic cross-sectional structure diagram from a second perspective of a fully sealed electromagnetic brake for offshore wind power generation provided by an embodiment of the present invention.

[0024] Reference numerals:

[0025] 1- stator housing; 2- long screw; 3- first O-ring; 4- handle assembly; 5- armature; 6- hollow pin; 7- friction plate; 8- cast aluminum rotor; 9- spline sleeve; 10- coil skeleton; 11- electromagnetic wire; 12- compression spring; 13- flange; 14- second O-ring; 15- handle bolt; 16- third O-ring; 17- skeleton oil seal; 18- handle spring; 19- flat washer; 20- hexagonal nut. DETAILED DESCRIPTION

[0026] For ease of understanding, the fully sealed electromagnetic brake for offshore wind power generation provided by an embodiment of the present invention is described in detail below with reference to the accompanying drawings.

[0027] The embodiment of the present invention provides a fully sealed electromagnetic brake for offshore wind power generation, such as Figure 1 and Figure 2 As shown, it includes: a stator housing 1 filled with sealant, a coil skeleton 10 is assembled inside the stator housing 1, and the coil skeleton 10 is wound with an electromagnetic wire 11; the stator housing 1 has a spring hole, a compression spring 12 is embedded in the spring hole, and the other end of the compression spring 12 is in contact with one side of the armature 5, the armature 5 is penetrated by a hollow pin, and the hollow pin is connected to the stator housing 1; two friction plates 7 are respectively bonded to both sides of the cast aluminum rotor 8, the cast aluminum rotor 8 is connected to the spline sleeve 9 through a spline, and the spline sleeve 9 is installed on the motor shaft; the other two sides of the two friction plates 7 are in contact with the armature 5 and one side of the flange 13, and the flange A U-shaped groove is provided on the surface of one side of 13 close to the friction plate 7, and the U-shaped groove is used to accommodate particles dropped by the friction plate after friction; an outer stop is provided on the other side of the flange 13, and the outer stop is used to form an overfit with the motor end cover. At the same time, the outer stop of the flange 13 has an annular groove, and the annular groove accommodates a second O-ring 14; the brake is fixed to the rear end cover of the motor by a long screw 2 through a threaded connection, and the connection between the long screw 2 and the stator housing 1 is sealed by two first O-rings 3. At the same time, the stator housing 1 has a stop step for accommodating the first O-ring 3 for sealing and protecting the first O-ring 3.

[0028] Compared with the prior art, the fully sealed electromagnetic brake for offshore wind power generation according to the embodiment of the present invention has the following advantages:

[0029] In the fully sealed electromagnetic brake for offshore wind power generation provided by an embodiment of the present invention, the brake mounting bolts and handle bolts adopt standard M8 and M5 threads, respectively. The bolt flanges are each equipped with two sealing rings with a wire diameter of φ1.8. A stop step is designed at the connection between the brake bolt mounting hole and the handle bolt to accommodate the O-ring. This not only provides a seal, but also effectively prevents damage to the O-ring due to excessive preload during brake installation, while also effectively preventing the mounting bolt from loosening. In addition, an O-ring seal is also designed at the junction of the brake flange stop and the stator housing. In addition, compared with existing brakes of the same model, the height of this brake is shortened from 80mm to 70mm and the weight is reduced by 10%. The increased diameter of the electromagnetic wire effectively reduces the electrical power of the entire machine, increases electrical efficiency by 3%, and reduces current by 5%. In addition, the increased stator electromagnetic force ensures that even after the friction plate wears out due to long-term operation, the armature can still be attracted when the air gap reaches 0.8mm, thereby extending the brake service life. From this analysis, it can be seen that the fully sealed electromagnetic brake for offshore wind power generation provided by the embodiment of the present invention adopts a special fully sealed structural design, which can increase the internal sealing performance of the brake, so that the protection level reaches IP65, and effectively improve the surface corrosion resistance of the product. At the same time, it can still provide a larger brake torque with a smaller outer size, and increase the use range of different torques with the same machine size, reduce the brake selection, and reduce the cost of opening multiple brake manufacturing lines; and, since a compression spring is embedded in the spring hole of the stator housing, and the other end of the compression spring is in contact with one side of the armature, the armature is penetrated by a hollow pin , and the hollow pin is connected to the stator housing; the two friction plates are respectively bonded to both sides of the cast aluminum rotor, the cast aluminum rotor is connected to the spline sleeve through splines, and the spline sleeve is installed on the motor shaft; the other two sides of the two friction plates are respectively in contact with the armature and one side of the flange, and the surface of the flange close to the friction plate is provided with a U-shaped groove, which can be used to accommodate particles dropped by the friction plate due to friction. Therefore, the electromagnetic brake can prevent the friction plate under the rotor from rubbing against the dual part for a long time, thereby effectively reducing the brake noise and increasing the service life of the brake, and at the same time it can also improve the overall quality of the electromagnetic brake during use.

[0030] In actual application, such as Figure 1 and Figure 2 As shown, the hexagonal handle bolt 15 is connected to the handle assembly 4 of the brake through the handle spring 18, and the handle bolt 15 is connected to the armature 5 through the stator housing 1. At the same time, the bolt connection is sealed with the stator housing 1 using a third O-ring 16. Pulling the handle assembly 4 can manually control the attraction and release of the armature 5.

[0031] Among them, Figure 1 and Figure 2As shown, the outer surface of the stator housing 1 adopts streamlined axial heat dissipation ribs, thereby effectively increasing the surface heat dissipation area and reducing the temperature rise by 10-15K.

[0032] Specifically, if Figure 1 and Figure 2 As shown, the height of the stop step can be 1.3 mm.

[0033] Furthermore, if Figure 1 and Figure 2 As shown, the diameter of the electromagnetic wire 11 can be φ0.27.

[0034] Furthermore, the hexagonal handle bolt 15 may be configured with a hexagonal nut 20 , and the hexagonal nut 20 may be provided with a flat washer 19 .

[0035] Furthermore, if Figure 1 and Figure 2 As shown, the motor shaft may be provided with a skeleton oil seal 17 .

[0036] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A fully sealed electromagnetic brake for offshore wind power generation, characterized in that: include: A stator housing filled with sealant, wherein a coil bobbin is assembled inside the stator housing, and an electromagnetic wire is wound around the coil bobbin; The stator housing has a spring hole, in which a compression spring is embedded, and the other end of the compression spring contacts one side of the armature, the armature is penetrated by a hollow pin, and the hollow pin is connected to the stator housing; two friction plates are respectively bonded to both sides of the cast aluminum rotor, the cast aluminum rotor is connected to the spline sleeve through a spline, and the spline sleeve is installed on the motor shaft; the other two sides of the two friction plates are respectively in contact with the armature and one side of the flange, and the flange is provided with a U-shaped groove on the side surface close to the friction plate, and the U-shaped groove is used to accommodate The friction plate removes particles dropped by friction; an outer stop is provided on the other side of the flange, and the outer stop is used to form an overfit with the motor end cover, and at the same time, the outer stop of the flange has an annular groove, and the annular groove accommodates a second O-ring; the brake is fixed to the rear end cover of the motor by a long screw through a threaded connection, and the connection between the long screw and the stator housing is sealed by two first O-rings, and the stator housing has a stop step for accommodating the first O-ring for sealing, and plays a role in protecting the first O-ring.

2. The fully sealed electromagnetic brake for offshore wind power generation according to claim 1, characterized in that: The hexagonal handle bolt is connected to the handle assembly of the brake through the handle spring, and the handle bolt is connected to the armature through the stator housing. At the same time, a third O-ring is used to seal the bolt connection with the stator housing. By pulling the handle assembly, the engagement and release of the armature can be manually controlled.

3. The fully sealed electromagnetic brake for offshore wind power generation according to claim 1 or 2, characterized in that: The outer surface of the stator housing adopts streamlined axial heat dissipation ribs.

4. The fully sealed electromagnetic brake for offshore wind power generation according to claim 3, characterized in that: The height of the stop step is 1.3 mm.

5. The fully sealed electromagnetic brake for offshore wind power generation according to claim 4, characterized in that: The diameter of the electromagnetic wire is φ0.

27.

6. The fully sealed electromagnetic brake for offshore wind power generation according to claim 2, characterized in that: The handle bolt is equipped with a hexagonal nut, and the hexagonal nut is provided with a flat washer.

7. The fully sealed electromagnetic brake for offshore wind power generation according to claim 1 or 6, characterized in that: The motor shaft is provided with a skeleton oil seal.

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