A double-motor front-end speed regulation structure of a wind power gear box

Abstract

The utility model discloses a kind of wind power gear box double-motor front end speed regulation structure, comprising: fan blade, wind power gear box, differential speed regulation gear box, speed regulation motor, generator, output gear, motor gear and permanent magnet generator, fan blade is connected with the input end transmission of wind power gear box, the output end of wind power gear box is connected with output gear transmission, output gear and motor gear mesh transmission, motor gear is connected with the input end of permanent magnet generator, the output end of permanent magnet generator is connected with speed regulation motor, speed regulation motor is connected with differential speed regulation gear box transmission, output gear is connected with the input end transmission of differential speed regulation gear box, the output end of differential speed regulation gear box is connected with generator. The present application uses the mode of speed regulation motor directly driving differential mechanism to adjust generator input speed, response speed is fast, speed control precision is high, and then make its power generation stable, entire speed regulation system is all used self power supply, need not power grid electricity.

Description

Technical Field

[0001] This utility model relates to the field of wind turbine technology, and in particular to a speed regulation structure at the front end of a dual-motor wind turbine gearbox. Background Technology

[0002] The wind turbine gearbox is a core mechanical component of a wind turbine generator set. Its main function is to increase the low speed of the wind turbine rotor to the high speed required for generator operation. However, when the wind turbine gearbox drives the generator, the drive speed is unstable. While a converter can be used to keep the frequency consistent with the grid, this results in poor power quality and is detrimental to the grid. To stabilize the generator input speed, a speed control system is needed to monitor the generator input speed in real time and adjust it when it deviates from the predetermined speed.

[0003] Currently known wind power speed control systems include: hydraulic torque converter and differential mechanism systems, hydraulic pump-motor circuit and differential mechanism systems, and fully hydraulic transmission systems. The first two both use differential mechanisms but choose different drive methods, while the third uses a completely hydraulic system for speed control.

[0004] Referring to the Chinese patent document entitled "A Hydraulic Torque-Variable Brushless Synchronous Electric Excitation Generator Set" with publication number "CN104852517A", the wind power speed regulation system in this patent document adopts a system structure of hydraulic torque converter and differential mechanism. The hydraulic torque-variable brushless synchronous electric excitation generator set includes a front frame, main shaft, main gearbox, brushless synchronous electric excitation generator and rear frame. The rear frame is equipped with a generator control cabinet and a generator control cabinet. The main gearbox is connected to the brushless synchronous electric excitation generator through the hydraulic torque converter. The brushless synchronous electric excitation generator is directly coupled to the power grid.

[0005] Referring to Chinese patent document published under the title "A Hydraulic Constant Speed ​​Output Device" with publication number "CN204300276U", the wind power speed regulation system in this patent document adopts a system structure of hydraulic pump-motor circuit and differential mechanism. This hydraulic constant speed output device consists of three parts: differential gear train, hydraulic system, and monitoring and control system. The changing speed is provided by a power source and is input to the sun gear of the differential gear train through the main input shaft. The sun gear meshes with the planet gears on the planet carrier, and the planet carrier is connected to the output shaft. In the hydraulic system, the hydraulic pump obtains power from the main input shaft through the first meshing gear, and acts on the hydraulic motor through hydraulic oil to provide power to the hydraulic motor. The output shaft of the hydraulic motor is connected to the gear ring in the differential gear train through the second meshing gear.

[0006] The wind power speed regulation systems in the two patent publications mentioned above involve hydraulic systems, which makes the entire transmission system more complex. They require an additional motor to drive the hydraulic system, and the motor needs to draw power from the grid. Furthermore, the overall efficiency is low and the control accuracy is generally poor. Utility Model Content

[0007] To address the aforementioned technical problems, the purpose of this utility model is to provide a dual-motor front-end speed regulation structure for wind turbine gearboxes. This structure uses a speed-regulating motor to directly drive a differential mechanism to adjust the generator input speed, resulting in fast response and high speed control accuracy, thereby ensuring stable generator power generation. The entire speed regulation structure is powered by its own power supply and does not require drawing power from the grid.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A wind turbine gearbox dual-motor front-end speed regulation structure includes: wind turbine blades, a wind turbine gearbox, a differential speed regulation gearbox, a speed regulating motor, a generator, an output gear, a motor gear, and a permanent magnet generator. The wind turbine blades are driven to the input end of the wind turbine gearbox, the output end of the wind turbine gearbox is driven to the output gear, the output gear meshes with the motor gear, the motor gear is connected to the input end of the permanent magnet generator to drive the permanent magnet generator to generate electricity, the output end of the permanent magnet generator is connected to the speed regulating motor, the speed regulating motor is driven to the differential speed regulation gearbox to adjust the speed of the differential speed regulation gearbox, the output gear is driven to the input end of the differential speed regulation gearbox, and the output end of the differential speed regulation gearbox is connected to the generator.

[0010] In some embodiments, the differential speed regulating gearbox includes: a differential first-stage sun gear, a differential first-stage planetary gear, a differential first-stage planetary carrier, a differential first-stage ring gear, a differential second-stage sun gear, a differential second-stage planetary gear, a differential second-stage planetary carrier, and a differential second-stage ring gear. The differential first-stage ring gear and the differential second-stage ring gear are fixedly connected or integrally formed. The differential first-stage planetary gear meshes with the differential first-stage sun gear and the differential first-stage ring gear respectively for transmission. The differential first-stage planetary gear is movably connected to the differential first-stage planetary carrier. The differential first-stage planetary carrier is connected to the output gear for transmission. The differential first-stage sun gear is connected to a generator for driving the generator to generate electricity. The differential second-stage planetary gear meshes with the differential second-stage sun gear and the differential second-stage ring gear respectively for transmission. The differential second-stage planetary gear is movably connected to the differential second-stage planetary carrier. The differential second-stage planetary carrier is fixed, allowing the differential second-stage planetary gear to rotate on a fixed axis. The differential second-stage sun gear is coaxially connected to a speed regulating motor, which is used to adjust the speed of the differential second-stage sun gear.

[0011] In some embodiments, the differential primary sun gear is coaxially connected to the speed-regulating motor, and the shaft of the differential primary sun gear is loosely fitted onto the differential secondary sun gear and the speed-regulating motor, passing sequentially through the differential secondary sun gear, the speed-regulating motor, and connected to the generator.

[0012] In some embodiments, the shaft of the differential primary sun gear is connected to the shaft of the generator via a second coupling.

[0013] In some embodiments, the wind turbine gearbox includes: a primary sun gear, a primary planetary gear, a primary planetary carrier, a primary ring gear, a secondary sun gear, a secondary planetary gear, a secondary planetary carrier, a secondary ring gear, a tertiary gear, and a second output gear. The shaft of the wind turbine blade is fixedly connected to the primary planetary carrier, driving the primary planetary carrier to rotate. The primary planetary gears are movably connected to the primary planetary carrier, meshing with the primary sun gear and the primary ring gear respectively. The primary sun gear is coaxially fixedly connected to the secondary planetary carrier, the secondary planetary gears are movably connected to the secondary planetary carrier, meshing with the secondary sun gear and the secondary ring gear respectively. The primary ring gear and the secondary ring gear are fixed, the secondary sun gear is coaxially fixedly connected to the tertiary gear, the second output gear meshes with the tertiary gear, and the second output gear is connected to the output gear.

[0014] In some embodiments, the second output gear is coaxially connected to the output gear and the differential first-stage planetary carrier, and rotates synchronously.

[0015] In some embodiments, the shaft of the second output gear is connected to the shaft of the differential first-stage planetary carrier via a first coupling.

[0016] In some embodiments, the generator is an excitation high-voltage synchronous generator.

[0017] This utility model has the following beneficial effects:

[0018] The wind turbine gearbox dual-motor front-end speed regulation structure of this invention uses a speed-regulating motor to directly drive a differential mechanism to adjust the generator input speed. On the one hand, the differential speed-regulating gearbox of this invention eliminates the hydraulic system, reducing the complexity of the mechanism; on the other hand, the differential speed-regulating gearbox of this invention has a fast response and high control precision, thus ensuring stable power generation by the generator. Furthermore, the speed-regulating motor of this invention can be directly powered by the permanent magnet generator driven by the wind turbine gearbox, eliminating the need to draw power from the grid and improving efficiency. The generator in this invention is an excitation high-voltage synchronous generator, which is directly connected to the grid after generating power, eliminating the need for a traditional step-up substation for voltage transformation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the front-end speed regulation structure of the dual motors in the wind turbine gearbox in this embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Wind turbine gearbox; 2. Differential speed regulating gearbox; 3. Speed ​​regulating motor; 4. Generator; 5. Permanent magnet generator; 6. Wind turbine blades; 7. First-stage planetary gear; 8. First-stage ring gear; 9. First-stage sun gear; 10. Second-stage planetary gear; 11. Second-stage ring gear; 12. Second-stage sun gear; 13. Third-stage gear; 14. Second output gear; 15. Output gear; 16. Motor gear; 17. Differential first-stage planetary gear; 18. Differential first-stage ring gear; 19. Differential first-stage sun gear; 20. Differential second-stage ring gear; 21. Differential second-stage planetary gear; 22. Differential second-stage sun gear; 23. First-stage planetary carrier; 24. Second-stage planetary carrier; 25. Differential first-stage planetary carrier; 26. Differential second-stage planetary carrier; 27. First coupling; 28. Second coupling. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below. It should be emphasized that the following description is merely exemplary and not intended to limit the scope and application of this utility model.

[0023] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component. Furthermore, a connection can be used for fixing, coupling, or communication.

[0024] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] refer to Figure 1The wind turbine gearbox dual-motor front-end speed regulation structure of this utility model embodiment includes: wind turbine blades 6, wind turbine gearbox 1, differential speed regulation gearbox 2, speed regulation motor 3, generator 4, output gear 15, motor gear 16, and permanent magnet generator 5. The wind turbine blades 6 are driven to the input end of the wind turbine gearbox 1. The output end of the wind turbine gearbox 1 is driven to the output gear 15. The output gear 15 meshes with the motor gear 16. The motor gear 16 is connected to the input end of the permanent magnet generator 5 to drive the permanent magnet generator 5 to generate electricity. The output end of the permanent magnet generator 5 is connected to the speed regulation motor 3. The speed regulation motor 3 is driven to the differential speed regulation gearbox 2 to adjust the speed of the differential speed regulation gearbox 2. The output gear 15 is driven to the input end of the differential speed regulation gearbox 2. The output end of the differential speed regulation gearbox 2 is connected to the generator 4.

[0027] Existing differential speed regulating gearboxes often involve hydraulic systems, resulting in a complex transmission system that requires an additional motor to drive the hydraulic system. This motor draws power from the grid, and the overall efficiency and control precision are generally low. This invention uses a speed-regulating motor to directly drive the differential mechanism to adjust the input speed of the generator 4. This results in a fast response time, high speed control precision, and thus stable power generation. It eliminates the need for a hydraulic system, reducing the complexity of the mechanism. The differential speed regulating gearbox offers fast response and high control precision.

[0028] In this embodiment and some other embodiments, the differential speed regulating gearbox 2 includes: a differential first-stage sun gear 19, a differential first-stage planetary gear 17, a differential first-stage planetary carrier 25, a differential first-stage ring gear 18, a differential second-stage sun gear 22, a differential second-stage planetary gear 21, a differential second-stage planetary carrier 26, and a differential second-stage ring gear 20. The differential first-stage ring gear 18 and the differential second-stage ring gear 20 are fixedly connected or integrally formed. The differential first-stage planetary gear 17 meshes with the differential first-stage sun gear 19 and the differential first-stage ring gear 18 respectively. The differential first-stage planetary gear 17 is movably connected to the differential first-stage planetary carrier 25. The differential first-stage planetary carrier 25 is connected with... The output gear 15 is connected to the transmission. In this embodiment, the differential first-stage planetary carrier 25 is coaxially and fixedly connected to the output gear 15. The differential first-stage sun gear 19 is connected to the generator 4 and is used to drive the generator 4 to generate electricity. The differential second-stage planetary gear 21 meshes with the differential second-stage sun gear 22 and the differential second-stage ring gear 20 respectively. The differential second-stage planetary gear 21 is movably connected to the differential second-stage planetary carrier 26. The differential second-stage planetary carrier 26 is fixed, so that the differential second-stage planetary gear 21 rotates on a fixed axis. The differential second-stage sun gear 22 is coaxially connected to the speed regulating motor 3. The speed regulating motor 3 is used to adjust the speed of the differential second-stage sun gear 22.

[0029] In this embodiment and some other embodiments, the differential first-stage sun gear (19) is coaxially connected with the speed-regulating motor (3), and the shaft of the differential first-stage sun gear 19 is loosely sleeved on the differential second-stage sun gear 22 and the speed-regulating motor 3, passing through the differential second-stage sun gear 22 and the speed-regulating motor 3 in sequence and connecting to the generator 4.

[0030] In this embodiment and some other embodiments, the shaft of the differential first-stage sun gear 19 is connected to the shaft of the generator 4 via a second coupling 28.

[0031] In this embodiment and some other embodiments, the wind turbine gearbox 1 includes: a primary sun gear 9, a primary planetary gear 7, a primary planetary carrier 23, a primary ring gear 8, a secondary sun gear 12, a secondary planetary gear 10, a secondary planetary carrier 24, a secondary ring gear 11, a tertiary gear 13, and a second output gear 14. The shaft of the wind turbine blade 6 is fixedly connected to the primary planetary carrier 23, driving the primary planetary carrier 23 to rotate. The primary planetary gear 7 is movably connected to the primary planetary carrier 23, and the primary planetary gear 7 meshes with the primary sun gear 9 and the primary ring gear 8 respectively. The primary sun gear 9 and the secondary planetary carrier 24 are connected in the same direction. The shaft is fixedly connected, the secondary planetary gear 10 is movably connected to the secondary planetary carrier 24, the secondary planetary gear 10 meshes with the secondary sun gear 12 and the secondary ring gear 11 respectively, the primary ring gear 8 and the secondary ring gear 11 are fixed, the secondary sun gear 12 is coaxially fixedly connected to the tertiary gear 13, the second output gear 14 meshes with the tertiary gear 13, and the second output gear 14 is connected to the output gear 15. In this embodiment, the second output gear 14 and the output gear 15 are coaxially fixedly connected, and the tertiary gear 13 and the output gear 15 are large gears with a tooth tip circle diameter larger than other gears.

[0032] In this embodiment and some other embodiments, the second output gear 14 is coaxially connected with the output gear 15 and the differential first-stage planetary carrier 25, and rotates synchronously.

[0033] In this embodiment and some other embodiments, the shaft of the second output gear 14 is connected to the shaft of the differential first-stage planetary carrier 25 via the first coupling 27.

[0034] In this embodiment and some other embodiments, generator 4 is an excitation high-voltage synchronous generator. In this embodiment, an excitation high-voltage synchronous generator is used, which is directly connected to the grid after generating electricity, eliminating the need for a traditional step-up substation for voltage transformation.

[0035] The working process of the dual-motor front-end speed regulation structure of the wind turbine gearbox in this embodiment is as follows:

[0036] The wind turbine blades 6 drive the wind turbine gearbox 1 to work: the wind turbine blades 6 capture wind energy to drive the first-stage planetary carrier 23 to rotate, and then drive the first-stage sun gear 9 to operate through the first-stage planetary gear 7 and the first-stage ring gear 8. The first-stage sun gear 9 drives the second-stage planetary carrier 24 to rotate, and then drives the second-stage sun gear 12 to rotate through the second-stage planetary gear 10 and the second-stage ring gear 11. The second-stage sun gear 12 is coaxial with the third-stage gear 13. The third-stage gear 13 drives the second output gear 14 to rotate. The second output gear 14 is coaxial with the output gear 15. The second output gear 14 splits the output energy. Part of it is transmitted to the permanent magnet generator 5 through the output gear 15 and the motor gear 16. The permanent magnet generator 5 generates electricity to power the speed-regulating motor 3. Most of the energy is used to drive the differential speed-regulating gearbox 2. The differential speed regulating gearbox 2 operates as follows: The second output gear 14 of the wind turbine gearbox 1 is connected to the differential first-stage planetary carrier 25 of the differential speed regulating gearbox 2 via the first coupling 27. The second output gear 14 drives the differential first-stage planetary carrier 25 to rotate, which in turn drives the differential first-stage sun gear 19 through the differential first-stage ring gear 18 and the differential first-stage planetary gears 17. The differential first-stage sun gear 19, as the output stage, is connected to the excitation high-voltage synchronous generator 4 via the second coupling 28 and drives it to generate electricity. When the output speed of the differential first-stage sun gear 19 decreases or increases, the speed regulating motor 3 adjusts accordingly. The speed of the differential second-stage sun gear 22 is adjusted. The differential second-stage sun gear 22 changes the speed of the differential second-stage ring gear 20 through the meshing of the differential second-stage planetary gear 21 and the differential second-stage ring gear 20. Since the differential first-stage ring gear 18 and the differential second-stage ring gear 20 are rigidly connected, the speed of the differential first-stage ring gear 18 is the same as the speed of the differential second-stage ring gear 20, and changes with the speed of the differential second-stage ring gear 20. After the speed of the differential first-stage ring gear 18 changes, the speed of the differential first-stage sun gear 19 is changed through the differential first-stage planetary gear 17, thus completing the adjustment of the output speed. Through the operation of the entire system, the input speed of the excitation high-voltage synchronous generator 4 is stabilized within the rated tolerance range.

[0037] This invention's wind turbine gearbox dual-motor front-end speed regulation structure increases speed through a wind turbine gearbox 1, then most of the power is input to a differential speed regulation gearbox 2, ultimately driving an excitation high-voltage synchronous generator 4 to generate electricity and connect to the grid. A small portion of the power is input to a permanent magnet generator 5, which in turn supplies power to a speed-regulating motor 3. The speed-regulating motor 3 adjusts the input speed of the excitation high-voltage synchronous generator 4 by driving the differential speed regulation gearbox 2, ultimately ensuring a stable input speed for the generator over a long period. Compared to traditional wind power generation front-end speed regulation methods, this invention employs motor speed regulation, and the entire speed regulation system is powered entirely by itself, eliminating the need to draw power from the grid.

[0038] The above description, in conjunction with specific / preferred embodiments, provides a further detailed explanation of the present invention and should not be construed as limiting the specific implementation of the present invention to these descriptions. For those skilled in the art, various substitutions or modifications can be made to these described embodiments without departing from the concept of the present invention, and all such substitutions or modifications should be considered within the protection scope of the present invention. In the description of this specification, the reference to terms such as "an embodiment," "some embodiments," "preferred embodiment," "example," "specific example," or "some examples," etc., indicates that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the described specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples. Without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification and the features of different embodiments or examples. Although embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations may be made herein without departing from the scope of protection of the patent application.

Claims

1. A speed regulation structure for the front end of a dual-motor wind turbine gearbox, characterized in that, include: The wind turbine blades (6), wind turbine gearbox (1), differential speed regulating gearbox (2), speed regulating motor (3), generator (4), output gear (15), motor gear (16) and permanent magnet generator (5) are connected to the input end of the wind turbine gearbox (1). The output end of the wind turbine gearbox (1) is connected to the output gear (15). The output gear (15) meshes with the motor gear (16). The motor gear (16) is connected to the input end of the permanent magnet generator (5) to drive the permanent magnet generator (5) to generate electricity. The output end of the permanent magnet generator (5) is connected to the speed regulating motor (3). The speed regulating motor (3) is connected to the differential speed regulating gearbox (2) to adjust the speed of the differential speed regulating gearbox (2). The output gear (15) is connected to the input end of the differential speed regulating gearbox (2). The output end of the differential speed regulating gearbox (2) is connected to the generator (4).

2. The wind turbine gearbox dual-motor front-end speed regulation structure as described in claim 1, characterized in that, The differential speed regulating gearbox (2) includes: a differential first-stage sun gear (19), a differential first-stage planetary gear (17), a differential first-stage planetary carrier (25), a differential first-stage ring gear (18), a differential second-stage sun gear (22), a differential second-stage planetary gear (21), a differential second-stage planetary carrier (26), and a differential second-stage ring gear (20). The differential first-stage ring gear (18) and the differential second-stage ring gear (20) are fixedly connected or integrally formed. The differential first-stage planetary gear (17) meshes with the differential first-stage sun gear (19) and the differential first-stage ring gear (18) respectively. The differential first-stage planetary gear (17) is movably connected to the differential first-stage planetary carrier (25). The primary planetary carrier (25) is connected to the output gear (15) for transmission. The differential primary sun gear (19) is connected to the generator (4) for driving the generator (4) to generate electricity. The differential secondary planetary gear (21) meshes with the differential secondary sun gear (22) and the differential secondary gear ring (20) respectively for transmission. The differential secondary planetary gear (21) is movably connected to the differential secondary planetary carrier (26). The differential secondary planetary carrier (26) is fixed, so that the differential secondary planetary gear (21) rotates on a fixed axis. The differential secondary sun gear (22) is coaxially connected to the speed regulating motor (3). The speed regulating motor (3) is used to adjust the speed of the differential secondary sun gear (22).

3. The wind turbine gearbox dual-motor front-end speed regulation structure as described in claim 2, characterized in that, The differential first-stage sun gear (19) is coaxially connected to the speed-regulating motor (3). The shaft of the differential first-stage sun gear (19) is loosely fitted on the differential second-stage sun gear (22) and the speed-regulating motor (3), and passes through the differential second-stage sun gear (22), the speed-regulating motor (3) and the generator (4) in sequence.

4. The wind turbine gearbox dual-motor front-end speed regulation structure as described in claim 2, characterized in that, The shaft of the differential first-stage sun gear (19) is connected to the shaft of the generator (4) via the second coupling (28).

5. The wind turbine gearbox dual-motor front-end speed regulation structure as described in claim 2, characterized in that, The wind turbine gearbox (1) includes: a primary sun gear (9), a primary planetary gear (7), a primary planetary carrier (23), a primary ring gear (8), a secondary sun gear (12), a secondary planetary gear (10), a secondary planetary carrier (24), a secondary ring gear (11), a tertiary gear (13), and a second output gear (14). The shaft of the wind turbine blade (6) is fixedly connected to the primary planetary carrier (23) to drive the primary planetary carrier (23) to rotate. The primary planetary gear (7) is movably connected to the primary planetary carrier (23). The primary planetary gear (7) is connected to the primary sun gear (9) and a secondary output gear (14). The first-stage ring gear (8) meshes and drives the first-stage sun gear (9) and the second-stage planetary carrier (24) coaxially and fixedly connected. The second-stage planetary gear (10) is movably connected to the second-stage planetary carrier (24). The second-stage planetary gear (10) meshes and drives the second-stage sun gear (12) and the second-stage ring gear (11) respectively. The first-stage ring gear (8) and the second-stage ring gear (11) are fixed. The second-stage sun gear (12) is coaxially and fixedly connected to the third-stage gear (13). The second output gear (14) meshes and drives the third-stage gear (13). The second output gear (14) is connected to the output gear (15) for transmission.

6. The wind turbine gearbox dual-motor front-end speed regulation structure as described in claim 5, characterized in that, The second output gear (14) is coaxially connected with the output gear (15) and the differential first-stage planetary carrier (25) and rotates synchronously.

7. The wind turbine gearbox dual-motor front-end speed regulation structure as described in claim 6, characterized in that, The shaft of the second output gear (14) is connected to the shaft of the differential first-stage planetary carrier (25) via the first coupling (27).

8. The wind turbine gearbox dual-motor front-end speed regulation structure as described in claim 1, characterized in that, The generator (4) is an excitation high-voltage synchronous generator.

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