Omni-sealed electromagnetic brake for offshore wind power generation

Abstract

The invention discloses a fully-sealed electromagnetic brake for offshore wind power generation, relates to the technical field of electromagnetic brakes, and aims to solve the technical problem that a rotor assembly of the electromagnetic brake cannot automatically reset when an existing motor is vertically mounted. In the offshore wind power generation fully-sealed electromagnetic brake, a coil framework is assembled in a stator shell, and an electromagnetic wire is wound on the coil framework; the stator shell is provided with a spring hole, a compression spring is embedded in the spring hole, the other end of the compression spring is in contact with one side of the armature, a hollow pin penetrates through the armature, and the hollow pin is connected with the stator shell; the two friction plates are bonded to the two sides of the cast-aluminum rotor respectively, the cast-aluminum rotor is connected with the spline housing through a spline, and the spline housing is installed on the motor shaft; the other two sides of the two friction plates make contact with the armature and one side of the flange plate correspondingly, and a U-shaped groove is formed in the surface of the side, close to the friction plates, of the flange plate. An outer spigot is formed in the other side of the flange plate, an annular groove is formed in the outer spigot, and a second O-shaped ring is contained in the 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, in particular to a fully sealed electromagnetic brake capable of returning a rotor assembly to its original position. Background Art

[0002] The electromagnetic power-off brake is the most common type of brake and the most widely used brake. It is used in nuclear power, wind power, automobiles, smelting, elevators, lifting and transmission transportation, etc. Therefore, the electromagnetic brake market is vast and diverse; as far as the wind power field is concerned, wind power generation is still one of the main development directions of my country's new energy industry. However, as the installed capacity of onshore wind power is gradually saturated, the vast ocean is the next stage for the development of wind power. As an indispensable and widely used safety control component for a single wind turbine, the market demand for the large-torque fully sealed electromagnetic brake of an offshore wind turbine is increasing with the rise of the wind power industry. Therefore, the research and development of wind power yaw electromagnetic brakes is imminent.

[0003] The high-torque fully sealed electromagnetic brake of offshore wind turbines is an indispensable component of the yaw mechanism of the wind turbine set in the yaw system. The wind turbine set uses the yaw drive to actively move the nacelle to the wind to ensure that the blades capture the most wind energy. The yaw mechanism of the wind turbine set includes: yaw motor, yaw reducer, yaw bearing, yaw caliper and hydraulic devices, soft starter and encoder, etc. Among them, the yaw motor plays a vital role as the power unit of the yaw system, and the electromagnetic brake used in the yaw motor is one of the most important parts of the yaw motor. The start and stop of the electromagnetic brake and the yaw motor are synchronized. In recent years, with the upgrading of wind turbine control technology, many intelligent control strategies for yaw systems have also emerged; advanced control algorithms can realize early prediction and identification of wind loads, and then cooperate with electromagnetic brakes to enable the yaw motor to better perform yaw or braking actions; and in order to better implement various control strategies of advanced control algorithms, the design of the yaw motor and its electromagnetic brake as hardware is crucial.

[0004] When wind turbines are yawed at sea, ordinary electromagnetic brakes cannot meet the requirements due to complex working conditions such as severe salt spray corrosion and large impact loads. The main reasons are backward manufacturing technology, the quality and variety of key materials cannot meet the requirements, scientific research and design work have not kept up, scientific research investment is small, new product development funds are scarce, and the company's technological innovation capabilities are weak. The current overall goal is to design a product with high torque and full sealing performance that is suitable for normal operation in the marine environment according to market demand, so as to improve the reliability of the wind power yaw system operation, and at the same time meet the service life requirements of the wind power industry brakes, improve product quality, and reduce the operating noise of the whole machine.

[0005] In other words, the prior art mainly has the following defects: (1) Most of the 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 and gas to penetrate through the mounting bolts and other parts; (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. (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 reserved installation space; (4) Most existing electromagnetic brakes and the rear end cover of the motor use a friction plate made by stamping. The flatness of the friction plate is difficult to control, which directly affects the brake noise and service life.

[0006] 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 need to solve urgently. Summary of the invention

[0007] 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 continuously 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 it can also improve the overall quality of the electromagnetic brake when in use.

[0008] In order to achieve the above object, the present invention adopts the following technical scheme: A fully sealed electromagnetic brake for offshore wind power generation, comprising: a stator housing injected with sealant, a coil frame installed inside the stator housing, and an electromagnetic wire wound on the coil frame; 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 an 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 two 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 a motor shaft; the other two sides of the two friction plates are respectively in contact with one side of the armature and a flange, and the A U-shaped groove is provided on the surface of one side of the flange close to the friction plate, 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, 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 a second O-ring is accommodated in the annular groove; 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 at the same time, the stator housing has a stop step for accommodating the first O-ring for sealing and protecting the first O-ring.

[0009] 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. Pulling the handle assembly can manually control the attraction and release of the armature.

[0010] Wherein, the outer surface of the stator shell adopts streamlined axial heat dissipation ribs.

[0011] Specifically, the height of the stop step is 1.3 mm.

[0012] Furthermore, the wire diameter of the electromagnetic wire is φ0.27.

[0013] Furthermore, the handle bolt with a hexagonal head is provided with a hexagonal nut, and the hexagonal nut is provided with a flat washer.

[0014] Furthermore, the motor shaft is provided with a skeleton oil seal.

[0015] Compared with the prior art, the fully sealed electromagnetic brake for offshore wind power generation described in the present invention has the following advantages: In the fully sealed electromagnetic brake for offshore wind power generation provided by the present invention, the brake mounting bolts and the 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, and the connection between the brake bolt mounting hole and the handle bolt is designed with a stop step for accommodating the O-ring, so that it can not only play a sealing role, but also effectively prevent the customer from damaging the O-ring due to excessive preload when installing the brake, and at the same time effectively prevent 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 the existing brake of the same model, the height of the brake is shortened from 80mm to 70mm, and the weight is reduced by 10%; the wire diameter of the electromagnetic wire is increased, so that the electrical power of the whole machine is effectively reduced, the electrical efficiency is increased by 3%, and the current is reduced by 5%; and the stator electromagnetic force is increased, so that after the friction plate is worn out after 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 improves the surface corrosion resistance of the product. At the same time, it can still provide a larger brake torque under a smaller outer 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 manufacturing lines for the brake; and because 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, and 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 the two 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, and the U-shaped groove can be used to accommodate particles dropped by the friction plate after friction. Therefore, the electromagnetic brake can make the friction plate under the rotor no longer rub 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 when it is used. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic cross-sectional structure diagram of a fully sealed electromagnetic brake for offshore wind power generation provided by an embodiment of the present invention from a first perspective; 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.

[0017] Reference numerals: 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

[0018] 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 in conjunction with the accompanying drawings.

[0019] 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 frame 10 is installed inside the stator housing 1, and the coil frame 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 contacts 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 the two 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 respectively 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 the flange 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, and 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, and the stator housing 1 has a stop step for accommodating the first O-ring 3 for sealing, and plays a role in protecting the first O-ring 3.

[0020] Compared with the prior art, the fully sealed electromagnetic brake for offshore wind power generation described in the embodiment of the present invention has the following advantages: In the fully sealed electromagnetic brake for offshore wind power generation provided by the embodiment of the present invention, the brake mounting bolts and the 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, and the brake bolt mounting hole and the handle bolt connection are designed with a stop step for accommodating the O-ring, so as to not only play a sealing role, but also effectively prevent the customer from damaging the O-ring due to excessive preload when installing the brake, and at the same time effectively prevent 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 the existing brake of the same model, the height of the brake is shortened from 80mm to 70mm, and the weight is reduced by 10%; the diameter of the electromagnetic wire is increased, so that the electrical power of the whole machine is effectively reduced, the electrical efficiency is increased by 3%, and the current is reduced by 5%; and the stator electromagnetic force is increased, so as to ensure that the brake can still attract the armature when the air gap reaches 0.8mm after the friction plate is worn out after long-term operation, 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 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 improves the surface corrosion resistance of the product, while enabling it to 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, because 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 the two 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 after friction. Therefore, the electromagnetic brake can make the friction plate under the rotor no longer rub 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 when it is used.

[0021] In practical 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 by a third O-ring 16. Pulling the handle assembly 4 can manually control the attraction and release of the armature 5.

[0022] 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.

[0023] Specifically, Figure 1 and Figure 2 As shown, the height of the stop step can be 1.3 mm.

[0024] Furthermore, if Figure 1 and Figure 2 As shown, the wire diameter of the electromagnetic wire 11 can be φ0.27.

[0025] 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 .

[0026] Furthermore, if Figure 1 and Figure 2 As shown, the motor shaft may be provided with a skeleton oil seal 17 .

[0027] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope 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 frame is installed inside the stator housing, and an electromagnetic wire is wound around the coil frame; 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 the two 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 Particles dropped by the friction disc after 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 at the same time, 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. Pulling the handle assembly can manually control the attraction and release of the armature.

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 is 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 1, characterized in that: The handle bolt with a hexagonal head is provided 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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