Yaw correction structure of wind driven generator

Abstract

The utility model belongs to the technical field of wind driven generators, and particularly relates to a yaw correction structure of a wind driven generator. Comprising a cabin, a supporting shaft and a correction driving mechanism. The supporting shaft penetrates through the bottom of the cabin and is rotationally connected with the cabin; the part, outside the cabin, of the supporting shaft is fixedly connected with the tower pole; the correction driving mechanism comprises a worm gear, a worm and a servo motor; the worm gear is fixedly installed on the supporting shaft, the servo motor is installed in the cabin, one end of the worm is connected with an output shaft of the servo motor, the other end of the worm is connected with a bearing seat in the cabin, the worm is meshed with the worm gear, and when the servo motor drives the worm to rotate, counter-acting force promotes the cabin to rotate around the supporting shaft; the wind direction deviation is monitored in real time through the wind indicator and the first angle feedback unit, the yaw angle of a cabin is accurately detected through the second angle feedback unit, and an efficient closed-loop control system is formed; the problems that a traditional yaw system is lagged in adjustment, prone to over-adjustment and the like are effectively solved.

Description

Technical Field

[0001] This utility model belongs to the field of wind turbine technology, specifically relating to a yaw correction structure for a wind turbine. Background Technology

[0002] Wind turbines are crucial devices for converting wind energy into electrical energy, and their power generation efficiency is closely related to the windward direction of the blades. During actual operation, wind direction constantly changes. If the nacelle cannot adjust its position promptly and accurately, the blades will deviate from the optimal windward angle, thus reducing power generation efficiency and even increasing the load on the unit, affecting its lifespan.

[0003] Currently, most common yaw correction systems use motors to drive gears to achieve nacelle steering. While this structure can achieve yaw adjustment, it still has certain limitations in terms of control accuracy and response speed. Especially under conditions of frequent wind direction changes, traditional yaw correction systems are prone to problems such as adjustment lag and overcorrection. Utility Model Content

[0004] This invention aims to solve the problems of adjustment lag and overcorrection that are common in traditional yaw correction systems.

[0005] This utility model provides the following technical solution: a yaw correction structure for a wind turbine, including a nacelle, a support shaft, and a correction drive mechanism; the support shaft passes through the bottom of the nacelle and is rotatably connected to the nacelle; the part of the support shaft located outside the nacelle is fixedly connected to the tower; the correction drive mechanism includes a worm gear, a worm, and a servo motor; the worm gear is fixedly installed on the support shaft, the servo motor is installed inside the nacelle, one end of the worm is connected to the output shaft of the servo motor, and the other end is connected to a bearing seat inside the nacelle; the worm meshes with the worm gear, and when the servo motor drives the worm to rotate, the reaction force causes the nacelle to rotate around the support shaft.

[0006] Furthermore, the correction drive mechanism also includes a weather vane, which is installed outside the nacelle. A first angle feedback unit is provided between the weather vane's rotating shaft and the nacelle, and a second angle feedback unit is provided between the support shaft and the nacelle. The first angle feedback unit, the second angle feedback unit, and the servo motor are connected to the microcontroller. The first angle feedback unit transmits a start signal to the servo motor through the microcontroller, and the second angle feedback unit transmits a stop signal to the servo motor through the microcontroller.

[0007] Furthermore, the first angle feedback unit includes a turntable and a support plate; the turntable is connected to the wind vane's axis of rotation, the support plate is fixed to the inner wall of the nacelle, and a first proximity switch is provided on the top surface of the support plate. The first proximity switches are arranged in a ring array centered on the extension line of the wind vane's axis of rotation; a first contact is provided on the bottom surface of the turntable, offset from the wind vane's axis of rotation; the horizontal distance from the first contact to the wind vane's axis of rotation is equal to the horizontal distance from the first proximity switch to the wind vane's axis of rotation. After the turntable rotates with the wind vane by a first angle, the first contact triggers the first proximity switch at the corresponding position, and the first proximity switch transmits a start signal to the servo motor through a microcontroller.

[0008] Furthermore, an axle brake is also installed inside the cabin. The slewing brake seat in the axle brake is fixedly connected to the inner wall of the cabin, and the brake assembly in the axle brake can lock the support axle.

[0009] Furthermore, the second angle feedback unit includes a fixed frame, which is fixedly connected to the rotary brake seat. The fixed frame has a circular hole concentric with the support shaft. A ring is fixedly sleeved on the support shaft inside the circular hole of the fixed frame. An annular gap is left between the ring and the wall of the circular hole of the fixed frame. A second contact is provided on the circumference of the ring. A ring of second proximity switches is evenly distributed on the wall of the circular hole of the fixed frame. The number of second proximity switches is the same as that of the first proximity switches. After the fixed frame rotates by the cabin by a first angle, the second contact triggers the second proximity switch at the corresponding position. The second proximity switch transmits a stop signal to the servo motor through the microcontroller.

[0010] Furthermore, the bottom surface of the support plate is provided with sleeves that correspond one-to-one with the positions of the first proximity switches, and the wiring harnesses of the first proximity switches are each inserted into the sleeves.

[0011] Furthermore, the first proximity switch and the second proximity switch are inductive proximity switches.

[0012] Compared with the prior art, the advantages of this utility model are:

[0013] This invention provides a yaw correction structure for a wind turbine. It monitors wind direction deviation in real time using a wind vane and a first angle feedback unit, and accurately detects the nacelle yaw angle using a second angle feedback unit, forming a highly efficient closed-loop control system. This effectively solves the problems of lag and over-adjustment in traditional yaw systems. The angle feedback unit uses a combination of mechanical contacts and proximity switches, achieving signal triggering through simple physical contact and sensing. This avoids complex and expensive photoelectric encoders or absolute position sensors, reducing system cost and complexity. Attached Figure Description

[0014] Figure 1 A schematic diagram of a wind turbine yaw correction structure (first-person perspective);

[0015] Figure 2 A schematic diagram of a wind turbine yaw correction structure (second perspective).

[0016] Figure 3 This is a schematic diagram showing the concealed portion of the cabin.

[0017] Figure 4 This is a schematic diagram of the first angle feedback unit;

[0018] Figure 5 This is a schematic diagram of the second angle feedback unit;

[0019] Figure 6 This is a planar schematic diagram of the second angle feedback unit.

[0020] In the diagram: 1-Nacelle; 2-Support shaft; 3-Worm gear; 4-Worm; 5-Servo motor; 6-Bearing housing; 7-Wind vane; 7.1-Rotating shaft; 8-Turntable; 9-Supporting plate; 10-First proximity switch; 11-First contact; 12-Rotation brake seat; 13-Fixed frame; 14-Ring; 15-Second contact; 16-Second proximity switch; 17-Sleeve; 18-Anemometer; 19-Fan blade shaft. Detailed Implementation

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] like Figure 1 , Figure 2 , Figure 3 As shown: A yaw correction structure for a wind turbine includes a nacelle 1, a support shaft 2, and a correction drive mechanism; the support shaft 2 passes through the bottom of the nacelle 1 and is rotatably connected to the nacelle 1; the portion of the support shaft 2 located outside the nacelle 1 is fixedly connected to the tower; the correction drive mechanism includes a worm gear 3, a worm 4, and a servo motor 5; the worm gear 3 is fixedly installed on the support shaft 2, the servo motor 5 is installed inside the nacelle 1, one end of the worm 4 is connected to the output shaft of the servo motor 5, and the other end is connected to a bearing seat 6 inside the nacelle 1; the worm 4 meshes with the worm gear 3, and when the servo motor 5 drives the worm 4 to rotate, the reaction force causes the nacelle 1 to rotate around the support shaft 2.

[0023] The worm gear 3 is fixedly mounted on the support shaft 2, which is fixed to the ground via a tower rod. Therefore, the worm gear 3 is spatially fixed and does not rotate. The servo motor 5 and the worm 4 are installed inside the nacelle 1. According to the principle of action and reaction, when the worm 4 actively rotates and attempts to drive the fixed worm gear 3, the resulting reaction torque acts on the support of the worm 4 (nacelle 1). Therefore, the reaction torque will drive the entire nacelle 1 to rotate around the fixed support shaft 2.

[0024] The system employs a worm gear 3 and worm 4 meshing transmission, which, due to its inherent helix angle characteristics, possesses a reverse self-locking function. This means that when the servo motor 5 is not operating, external forces such as wind loads cannot reverse the drive of the worm 4, thus naturally locking the orientation of the nacelle 1 and improving the system's stability and reliability.

[0025] The correction drive mechanism also includes a wind vane 7, which is installed outside the nacelle 1. A first angle feedback unit is provided between the rotating shaft 7.1 of the wind vane 7 and the nacelle 1, and a second angle feedback unit is provided between the support shaft 2 and the nacelle 1. The first angle feedback unit, the second angle feedback unit, and the servo motor 5 are connected to the microcontroller. The first angle feedback unit transmits a start signal to the servo motor 5 through the microcontroller, and the second angle feedback unit transmits a stop signal to the servo motor 5 through the microcontroller.

[0026] like Figure 4 As shown: The first angle feedback unit includes a turntable 8 and a support plate 9; the turntable 8 is connected to the rotating shaft 7.1 of the wind vane 7, the support plate 9 is fixed to the inner wall of the cabin 1, and a first proximity switch 10 is provided on the top surface of the support plate 9. The first proximity switches 10 are arranged in a ring array with the extension line of the rotating shaft 7.1 of the wind vane 7 as the center; a first contact 11 is provided on the bottom surface of the turntable 8 away from the rotating shaft 7.1 of the wind vane 7; the horizontal distance from the first contact 11 to the rotating shaft 7.1 of the wind vane 7 is equal to the horizontal distance from the first proximity switch 10 to the rotating shaft 7.1 of the wind vane 7. After the turntable 8 rotates with the wind vane 7 by a first angle, the first contact 11 triggers the first proximity switch 10 at the corresponding position. The first proximity switch 10 transmits a start signal to the servo motor 5 through the microcontroller.

[0027] The wind vane 7 rotates with the wind direction, causing the turntable 8 on its shaft 7.1 to rotate. This causes the first contact 11 to rotate and approach a new first proximity switch 10, which is then triggered. The triggered first proximity switch 10 sends an electrical signal to the microcontroller. Upon receiving this signal, the microcontroller determines that the current windward angle deviation of the nacelle 1 has exceeded the allowable range and then sends a start command to the servo motor 5.

[0028] A shaft brake is also installed inside the cabin 1. The slewing brake seat 12 of the shaft brake is fixedly connected to the inner wall of the cabin 1. The brake assembly of the shaft brake can lock the support shaft 2.

[0029] like Figure 5 , Figure 6 As shown: The second angle feedback unit includes a fixed frame 13, which is fixedly connected to the rotary brake seat 12. The fixed frame 13 has a circular hole concentric with the support shaft 2. A ring 14 is fixedly sleeved on the support shaft 2 inside the circular hole of the fixed frame 13. An annular gap is left between the ring 14 and the wall of the circular hole of the fixed frame 13. A second contact 15 is provided on the circumference of the ring 14. A ring of second proximity switches 16 is evenly distributed on the wall of the circular hole of the fixed frame 13. The number of second proximity switches 16 is the same as that of the first proximity switches 10. After the fixed frame 13 rotates by the cabin 1 by a first angle, the second contact 15 triggers the second proximity switch 16 at the corresponding position. The second proximity switch 16 transmits a stop signal to the servo motor 5 through the microcontroller.

[0030] The second angle feedback unit is used to detect the rotation angle of the nacelle 1 relative to the support shaft 2. Its mounting bracket 13 is fixed to the inner wall of the nacelle 1 via a rotary brake seat 12, and therefore rotates with the nacelle 1. The ring 14 with the second contact 15 is fixedly fitted onto the support shaft 2 and remains stationary. When the nacelle 1 rotates under the drive of the servo motor 5, the mounting bracket 13 and the ring 14 move relative to each other. The second proximity switches 16, arranged in a ring array on the inner wall of the circular hole of the mounting bracket 13, will sequentially sweep across the fixed second contacts 15. When the rotation angle of the nacelle 1 reaches a preset value (this preset value corresponds to the trigger angle in the first angle feedback unit, i.e., compensating for the wind direction deviation angle), the second contact 15 enters the sensing range of the corresponding second proximity switch 16 and triggers it. The triggered second proximity switch 16 immediately sends an electrical signal to the microcontroller. Upon receiving this signal, the microcontroller determines that the nacelle 1 has been corrected and then sends a stop command to the servo motor 5. The servo motor 5 stops rotating, and the yaw action of the nacelle 1 stops accordingly.

[0031] The working principle of the wind turbine yaw correction structure in this embodiment is as follows: The wind vane 7 senses changes in wind direction, which serves as the start signal for the servo motor 5; the worm gear transmission pair converts the rotational drive of the servo motor 5 into yaw rotation of the nacelle 1, and utilizes its self-locking characteristic to maintain position; finally, the relative angle feedback between the nacelle 1 and the support shaft 2 serves as the stop signal for the servo motor 5, thereby achieving closed-loop control; the process is as follows:

[0032] Wind direction change → Wind vane 7 rotates → First angle feedback unit is triggered → Microcontroller starts servo motor 5 → Worm 4 rotates to drive worm wheel 3 to generate counter torque → Cabin 1 yaws around support shaft 2 → Second angle feedback unit detects that the relative angle is in place → Trigger stop signal → Microcontroller stops servo motor 5 → Correction complete, cabin 1 maintains the new orientation.

[0033] The bottom surface of the support plate 9 has sleeves 17 that correspond one-to-one with the positions of the first proximity switches 10, and the wire harnesses of the first proximity switches 10 are each inserted into the sleeves 17.

[0034] The first proximity switch 10 and the second proximity switch 16 are inductive proximity switches; the model of the first proximity switch 10 and the second proximity switch 16 is Omron E2B-M12KS04-WP-B1, and the model of the microcontroller is STM32F103C8T6; the signal output lines of all the first proximity switches 10 and the second proximity switches 16 are connected to different input pins of the microcontroller; one output pin of the microcontroller controls the start and stop of the servo motor 5 through a drive circuit (such as a relay or servo driver).

[0035] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A yaw correction structure for a wind power generator, characterized by: The application relates to a tower crane, which comprises a cabin (1), a supporting shaft (2) and a rectification driving mechanism; the supporting shaft (2) is rotatably connected with the cabin (1) through the bottom of the cabin (1); the part of the supporting shaft (2) outside the cabin (1) is fixedly connected with a tower pole; the rectification driving mechanism comprises a worm wheel (3), a worm (4) and a servo motor (5); the worm wheel (3) is fixedly installed on the supporting shaft (2), the servo motor (5) is installed in the cabin (1), one end of the worm (4) is connected with the output shaft of the servo motor (5), the other end of the worm (4) is connected with a bearing seat (6) in the cabin (1), the worm (4) is engaged with the worm wheel (3), and when the servo motor (5) drives the worm (4) to rotate, the reaction force promotes the cabin (1) to rotate around the supporting shaft (2).

2. The yaw correction structure of a wind power generator according to claim 1, characterized in that: The rectification driving mechanism further comprises a wind vane (7), the wind vane (7) is installed outside the cabin (1), a first angle feedback unit is arranged between the rotating shaft (7.1) of the wind vane (7) and the cabin (1), a second angle feedback unit is arranged between the supporting shaft (2) and the cabin (1), the first angle feedback unit, the second angle feedback unit and the servo motor (5) are communicated with a single-chip microcomputer, the first angle feedback unit transmits a starting signal to the servo motor (5) through the single-chip microcomputer, and the second angle feedback unit transmits a stopping signal to the servo motor (5) through the single-chip microcomputer.

3. A yaw correction structure for a wind turbine generator according to claim 2, characterized in that: The first angle feedback unit comprises a rotating disc (8) and a supporting disc (9); the rotating disc (8) is connected with the rotating shaft (7.1) of the wind vane (7), the supporting disc (9) is fixed to the inner wall of the cabin (1), the top surface of the supporting disc (9) is provided with first proximity switches (10), the first proximity switches (10) are arranged in an annular array with the extension line of the rotating shaft (7.1) of the wind vane (7) as the center, and the bottom surface of the rotating disc (8) is provided with a first contact (11) which is arranged to deviate from the rotating shaft (7.1) of the wind vane (7); the horizontal distance from the first contact (11) to the rotating shaft (7.1) of the wind vane (7) is equal to the horizontal distance from the first proximity switches (10) to the rotating shaft (7.1) of the wind vane (7), the first contact (11) triggers the first proximity switch (10) at the corresponding position after the rotating disc (8) rotates with the wind vane (7) by a first angle, and the first proximity switch (10) transmits a starting signal to the servo motor (5) through the single-chip microcomputer.

4. The yaw correction structure of a wind power generator according to claim 3, characterized in that: An axle brake is further installed in the cabin (1), the rotary brake seat (12) in the axle brake is fixedly connected with the inner wall of the cabin (1), and the brake assembly in the axle brake can lock the supporting shaft (2).

5. A yaw correction structure for a wind driven electric generator according to claim 4, wherein: The second angle feedback unit comprises a fixing frame (13) fixedly connected with the rotary brake seat (12), a circular hole concentric with the support shaft (2) is formed in the fixing frame (13), a circular ring (14) is fixedly sleeved on the support shaft (2) in the circular hole of the fixing frame (13), an annular gap is left between the circular ring (14) and the hole wall of the circular hole of the fixing frame (13), a second contact (15) is arranged on the circumference of the circular ring (14), a plurality of second proximity switches (16) are distributed at equal intervals on the hole wall of the circular hole of the fixing frame (13), the number of the second proximity switches (16) is the same as that of the first proximity switches (10), the second contact (15) triggers the second proximity switch (16) at the corresponding position after the fixing frame (13) rotates the first angle with the random cabin (1), and the second proximity switch (16) transmits a stop signal to the servo motor (5) through the single-chip microcomputer.

6. The yaw correction structure of a wind power generator according to claim 3, characterized in that: The bottom surface of the support disc (9) is distributed with sleeves (17) corresponding to the positions of the first proximity switches (10) one by one, and the wire harnesses of the first proximity switches (10) are respectively inserted into the sleeves (17).

7. The yaw correction structure of a wind power generator according to claim 5, characterized in that: The first proximity switches (10) and the second proximity switches (16) are inductive proximity switches.

Images