A device for simulating shaft current damage of offshore wind turbine generators

Abstract

The present invention discloses a device for simulating shaft current damage of an offshore wind turbine generator, comprising a motor, a first main shaft, an experimental bearing, a bearing seat, an upper support plate, a lower support plate, a programmable power supply, a brush, a current loading clamp, a second main shaft, a cam, an air spring, an exciter and a detection device; the motor and the bearing seat are fixed on the upper support plate, and an insulating gasket is provided between the bearing seat and the upper support plate; one end of the first main shaft is connected to the output shaft of the motor, and an experimental bearing is installed on the first main shaft, and the experimental bearing is installed in the bearing seat; the upper support plate is supported on the lower support plate by three air springs, and the center connecting line of the three air springs is a triangle; the three air springs are respectively connected to the air compressor. The present invention has a simple structure and can simulate the stress conditions of the bearings of offshore wind turbine generators under the conditions of lifting and undulating motions caused by waves and wind; and the experimental results are more accurate.

Description

Technical Field

[0001] The invention relates to a shaft current damage simulation device for an offshore wind turbine generator. Background Art

[0002] As a clean energy, wind power is an important way for the country to achieve the goals of carbon peak in 2030 and carbon neutrality in 2060. Offshore wind power has become an important way to utilize wind energy, but compared with onshore wind turbines, offshore wind turbines are fixed on floating platforms and move with the movement of ocean wind and waves. The load characteristics are more complex and failures occur more frequently. Bearing shaft current damage is a common failure mode of wind turbines. Under offshore wind and wave conditions, its occurrence mechanism couples the effects of complex mechanical loads, marine floating platform motion loads, motor shaft voltage and shaft current loads, and other loads. The damage mechanism is more complex. Studying the bearing shaft current damage of offshore wind turbine generators has become an important means to prevent motor failures and increase the service life of wind turbines.

[0003] However, in the current wind farm intelligent operation and maintenance system, the monitoring and intelligent operation and maintenance of bearing shaft current damage are not involved, and it is impossible to conduct field research with the help of the wind farm environment. The simulation test device needs to place the generator bearing shaft current damage device in the marine platform environment, focusing on simulating various wind, wave and current conditions. Most of the existing technologies use a six-degree-of-freedom motion simulation platform to simulate the forces in different directions borne by offshore wind turbines on the sea surface. The simulation platform is costly and expensive, and the six-axis parallel system of the six-degree-of-freedom motion simulation platform cannot achieve 360-degree unlimited rotation. The stroke of each degree of freedom is very limited. There are only six platforms in the series structure, and the load force requirement of the bottom platform is high, which increases the volume of the six-degree-of-freedom motion simulation platform. In view of the shortcomings of the six-degree-of-freedom motion simulation platform, this experimental platform designs a movable platform and uses rubber spring support to simulate the forces in different directions on the sea surface. It has a low cost, small size, simple and convenient operation, and can realize the operation of the bearing current damage simulation device under various types of load conditions on the sea surface, providing an experimental platform closer to the wind, wave and current environment for the study of offshore wind turbine bearing shaft current damage. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an offshore wind turbine generator shaft current damage simulation device with a simple structure, which can simulate the stress conditions of offshore wind turbine generator bearings under the lifting and undulating movements caused by waves and wind, so that the experimental results are more accurate.

[0005] The technical solution adopted by the present invention is: a device for simulating shaft current damage of an offshore wind turbine generator, comprising a motor, a first main shaft, an experimental bearing, a bearing seat, an upper support plate, a lower support plate, a programmable power supply, a brush, a current loading clamp, a second main shaft, a cam, an air spring, an exciter and a detection device; the motor and the bearing seat are fixed on the upper support plate, and an insulating gasket is provided between the bearing seat and the upper support plate; one end of the first main shaft is connected to the output shaft of the motor, an experimental bearing is installed on the first main shaft, and the experimental bearing is installed in the bearing seat;

[0006] The upper supporting plate is supported on the lower supporting plate by three air springs, and the center lines of the three air springs are triangles; the three air springs are respectively connected to the air compressor; the second main shaft is installed on the lower supporting plate through the bearing seat; the first main shaft is parallel to the second main shaft; a driving pulley is provided on the first main shaft, and a driven pulley and a cam are provided on the second main shaft, and the driving pulley and the driven pulley are connected by a belt; the cam is located at the center of the upper supporting plate; the exciter is installed on the upper supporting plate, and the positive and negative poles of the programmable power supply are respectively connected to the current loading clamp and the brush, the brush is installed on the first main shaft, and the current loading clamp is installed on the experimental bearing, and the detection device is used to detect the magnitude of the shaft current.

[0007] In the above-mentioned offshore wind turbine generator bearing current damage simulation device, the upper support plate and the lower support plate are both circular plates; the motor is installed on the motor support plate, and the motor support plate is fixed on the upper support plate.

[0008] In the above-mentioned offshore wind turbine generator bearing current damage simulation device, the center line of the three air springs forms an equilateral triangle, and the air compressor is connected to a computer.

[0009] In the above-mentioned offshore wind turbine generator bearing current damage simulation device, the detection device includes a current sensor and an acquisition card. The current sensor is installed on the wire connecting the programmable power supply and the current loading clamp or on the wire connecting the programmable power supply and the brush; the current sensor is connected to the computer through the acquisition card.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] 1. The present invention has a simple structure. Three air springs are arranged between the upper support plate and the lower support plate. The cam is used as the power element of the upper support plate, which enhances the flexibility and variability of the upper support plate, and is conducive to the movement of the air spring support to further simulate the impact of waves and wind on the bearings of offshore wind turbine generators, and can simulate the stress conditions of offshore wind turbine generators under the lifting and undulating movements caused by waves and wind; the experimental results are more accurate.

[0012] 2. The upper support plate of the present invention is supported by an air spring, and a vibration exciter is installed on the upper support plate. The air spring and the vibration exciter simultaneously provide radial force to the upper platform, so that the upper support plate can perform repeated lifting activities, further enhancing the flexibility of the upper support plate.

[0013] 3. The brush of the present invention is connected to the first main shaft to generate shaft current. The current loading clamp is connected to the experimental bearing, and a current sensor is provided to more accurately simulate the current erosion formed on the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view of the overall structural schematic diagram of the present invention.

[0015] Figure 2 It is an isometric view of the overall structural schematic diagram of the present invention.

[0016] Figure 3 It is a schematic diagram of the cam installation structure of the present invention.

[0017] In the figure: 1. motor; 2. first spindle; 3. experimental bearing; 4. bearing seat; 5. upper support plate; 6. programmable power supply; 7. brush; 8. current loading clamp; 9. driven pulley; 10. belt; 11. second spindle; 12. motor support plate; 13. bearing seat; 14. cam; 15. air spring; 16. air compressor; 17. insulating gasket; 18. bearing seat; 19. coupling; 20. vibrator. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] like Figure 1 As shown, the present invention includes a motor 1, a first spindle 2, an experimental bearing 3, a bearing seat 4, an upper support plate 5, a lower support plate, a programmable power supply 6, a brush 7, a current loading clamp 8, a second spindle 11, a motor support plate 12, a cam 14, an air spring 15, an exciter 20 and a detection device; the motor 1 is mounted on the motor support plate 12, the motor support plate 12 and the bearing seat 4 are fixed on the upper support plate, and an insulating gasket is provided between the bearing seat 4 and the upper support plate 5. One end of the first spindle 2 is connected to the output shaft of the motor 1, and an experimental bearing 3 is installed on the first spindle 2, and the experimental bearing 3 is installed in the bearing seat 4.

[0020] The upper support plate 5 is supported on the lower support plate by three air springs, and the center line of the three air springs 15 is an equilateral triangle. The upper support plate and the lower support plate are both circular plates, and the upper support plate and the lower support plate are coaxial. The three air springs 15 are respectively connected to the air compressor 16, and the air compressor 16 is connected to the computer. The second main shaft 11 is installed on the lower support plate through two bearing seats 13 and 18; the first main shaft 2 is parallel to the second main shaft 11; the first main shaft 2 is provided with a driving pulley, and the second main shaft 11 is provided with a driven pulley 9 and a cam 14, and the driving pulley and the driven pulley 9 are connected by a belt 10; the cam 14 is located at the center of the upper support plate 5. The exciter 20 is installed on the upper support plate, and the positive and negative poles of the programmable power supply 6 are respectively connected to the current loading clamp 8 and the brush 7, the brush 7 is installed on the first main shaft 2, and the current loading clamp 8 is installed on the experimental bearing 3. The detection device includes a current sensor and an acquisition card. The current sensor is installed on the wire connecting the program-controlled power supply 6 and the current loading clamp 8, or can be installed on the wire connecting the program-controlled power supply 6 and the brush 7. The current sensor is connected to the computer through the acquisition card.

[0021] The working principle of the present invention is as follows:

[0022] The cam 14 is connected to the second main shaft 11, and the first main shaft 2 drives the second main shaft 11 to rotate. The movement of the cam 14 drives the upper support plate 5 to rise and fall. The exciter 20 loads radial force on the upper support plate 5, and the air spring 15 supports the upper support plate 5 to simulate the force impact when the upper support plate 5 floats.

[0023] (1) Radial force loading part: The motor 1 provides power to the first spindle 2, the second spindle 11 is connected to the cam 14, the second spindle 11 provides radial force to the cam 14 and the upper support plate 5, the exciter 20 loads the upper support plate 5, and the three air springs 15 float up and down due to uneven force. This experiment can realize independent radial force loading, especially can simulate the influence of the bearing on the shaft current under the condition of uneven force, and its operation is simple.

[0024] (2) The present invention is provided with a detection device that can detect the current on the experimental bearing 3 in real time. The current signal detection includes an acquisition card, a current sensor, and an acquisition device, which are finally stored in a computer, thereby providing experimental proof for simulating the damage caused by the shaft current of the wind turbine generator bearing on the sea surface.

Claims

1. A device for simulating shaft current damage of offshore wind turbine generator, characterized in that: It includes a motor, a first spindle, an experimental bearing, a bearing seat, an upper support plate, a lower support plate, a programmable power supply, a brush, a current loading clamp, a second spindle, a cam, an air spring, an exciter and a detection device; the motor and the bearing seat are fixed on the upper support plate, and an insulating gasket is provided between the bearing seat and the upper support plate; one end of the first spindle is connected to the output shaft of the motor, and an experimental bearing is installed on the first spindle, and the experimental bearing is installed in the bearing seat; The upper support plate is supported on the lower support plate by three air springs, and the center connecting line of the three air springs is a triangle; the three air springs are respectively connected to the air compressor; the second main shaft is installed on the lower support plate through the bearing seat; the first main shaft is parallel to the second main shaft; the first main shaft is provided with a driving pulley, and the second main shaft is provided with a driven pulley and a cam, and the driving pulley and the driven pulley are connected by a belt; the cam is located at the center of the upper support plate; the exciter is installed on the upper support plate, and the positive and negative poles of the programmable power supply are respectively connected to the current loading clamp and the brush, the brush is installed on the first main shaft, and the current loading clamp is installed on the experimental bearing, and the detection device is used to detect the magnitude of the shaft current; The upper support plate and the lower support plate are both circular plates; the motor is mounted on the motor support plate, and the motor support plate is fixed on the upper support plate; The center line of the three air springs forms an equilateral triangle. The air compressor is connected to the computer; The detection device includes a current sensor and an acquisition card. The current sensor is installed on the wire connecting the programmable power supply and the current loading clamp or on the wire connecting the programmable power supply and the brush; the current sensor is connected to the computer through the acquisition card.

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