A self-torsional magnetic reluctance variable pitch wind turbine

Abstract

This invention relates to the field of wind turbine generators and provides a self-torsion reluctance variable pitch wind turbine generator, including a generator set, a turbine slewing body, and a tower assembly. The generator set includes a main generator, an auxiliary pitch generator, a main and auxiliary generator set housing, and blades. The main generator includes a main generator shaft, a main generator rotor, and a main generator stator. The auxiliary pitch generator includes an auxiliary pitch generator shaft, an auxiliary pitch generator rotor, and an auxiliary pitch generator stator. A pitch hub is also provided at the shaft end of the main generator shaft. The auxiliary pitch generator shaft passes through the main generator shaft, and a pitch synchronization disk is provided at the shaft end of the auxiliary pitch generator shaft. A first slewing bearing is provided on the pitch hub. This invention has an innovative structure, is simple to control, and facilitates improved safety performance of wind turbine generators.

Description

Technical Field

[0001] This invention relates to the field of wind turbine generators, specifically a self-torsional reluctance variable pitch wind turbine generator. Background Technology

[0002] When a wind turbine is in operation, the blades will spin faster and faster when it encounters strong winds. If the speed exceeds the rated speed, it may burn out the generator or even cause the entire machine to disintegrate due to centrifugal force.

[0003] Currently, there are two types of pitch control technologies for wind turbines: electronically controlled pitch control and centrifugal pitch control. Electronically controlled pitch control is an active pitch control method. The controller system and PLC detect the generator voltage and current, and use auxiliary motors, hydraulic systems, pushrods, and other equipment to achieve blade pitch control. This pitch control mechanism has a complex design, resulting in relatively high costs. Due to the complex mechanical design, the failure rate during operation is also relatively high. Currently, this technology is basically used in large wind turbines worldwide. Because this pitch control technology uses PLC control, the pitch control action is delayed. This pitch control structure also requires a power supply to the system. Centrifugal pitch control involves installing an iron flybar at the blade root and using the centrifugal force generated by the impeller speed to change the blade angle. This structure is a purely mechanical pitch control method. Centrifugal pitch control can only be used in high-speed wind turbines. Low-speed wind turbines are generally not suitable for this system, and centrifugal pitch control is a reverse pitch control mode, resulting in a very small angle change.

[0004] Therefore, in view of the above situation, there is an urgent need to provide a self-torsional reluctance variable pitch wind turbine to overcome the shortcomings in current practical applications. Summary of the Invention

[0005] The purpose of this invention is to provide a self-torsional reluctance variable pitch wind turbine, which aims to solve the problems mentioned in the background art.

[0006] This invention is implemented as follows: a self-torsion reluctance variable pitch wind turbine includes a generator set, a turbine slewing body, and a tower assembly. The generator set is connected to the tower assembly via the turbine slewing body. The generator set includes a main generator, an auxiliary pitch generator, a main and auxiliary generator set housing, and blades. The main generator includes a main generator shaft, a main generator rotor, and a main generator stator. The auxiliary pitch generator includes an auxiliary pitch generator shaft, an auxiliary pitch generator rotor, and an auxiliary pitch generator stator. The main generator shaft is disposed on the main and auxiliary generator sets. Inside the generator housing, a pitch hub is also provided at the shaft head of the main generator shaft. The auxiliary pitch generator shaft passes through the main generator shaft, and a pitch synchronizing disc is provided at the shaft head of the auxiliary pitch generator shaft. A first slewing bearing is provided on the pitch hub, and a wire rope fixing blade connecting disc is installed on the first slewing bearing. One end of the wire rope fixing blade connecting disc is connected to the blade, and the other end of the wire rope fixing blade connecting disc is wound with a wire rope. One end of the wire rope is fixed to the pitch synchronizing disc, and the other end of the wire rope is connected to a preload spring. There are three sets of wire ropes.

[0007] Compared with the prior art, the beneficial effects of the embodiments of the present invention are as follows: Under rated power, the blades drive the pitch hub to rotate, thereby causing the main generator shaft and the auxiliary pitch generator shaft to rotate synchronously and generate electricity together; when the wind speed is too high, the blades drive the pitch hub to rotate faster, resulting in a larger generator set power. When the auxiliary pitch generator exceeds the rated power, the preload of the preload spring is insufficient to overcome the motor torque, and the auxiliary pitch motor shaft will deflect at an angle. The deflected auxiliary pitch motor shaft drives the pitch synchronization disc to pull the wire rope, thereby driving the wire rope to fix the blade connecting disc to rotate, and then driving the blade to rotate synchronously at a certain angle, changing the windward working surface, so that the generator set speed decreases and the power decreases. When the auxiliary pitch generator drops to the predetermined power, the preload spring pulls the blade to rotate. Under the action of force, the blades rotate back on their own, increasing the windward surface area. When the torque and spring torque reach equilibrium, the blades stop rotating, and the windward surface remains at a certain angle, maintaining the generator set's speed. Through repeated adjustments, the generator set is automatically controlled within the rated power range. Compared with existing technologies, the magnetic reluctance pitch control of this invention is a passive, real-time pitch control without delay. It utilizes its own torque for pitch control, requiring no additional equipment. Control is simple, requiring only a normal controller to operate. Even if the controller or generator fails, this invention will not cause a safety accident because once the controller and generator fail, the pitch control system will remain at the maximum pitch control position, thus preventing a safety accident and effectively improving the safety performance of the wind turbine. Attached Figure Description

[0008] Figure 1 This is a partial exploded view of the generator set in an embodiment of the present invention;

[0009] Figure 2 This is a cross-sectional view of the generator set in an embodiment of the present invention;

[0010] Figure 3 This is a cross-sectional view of the main generator section in an embodiment of the present invention;

[0011] Figure 4 This is a schematic diagram a of the auxiliary generator section in an embodiment of the present invention;

[0012] Figure 5 This is a schematic diagram (b) of the auxiliary generator section in an embodiment of the present invention;

[0013] Figure 6 This is a schematic diagram of the working state of an embodiment of the present invention;

[0014] Figure 7 This is a schematic diagram of the non-working state according to an embodiment of the present invention.

[0015] In the attached diagram: 1-Preload spring, 2-First slewing bearing, 3-Wire rope fixing blade connecting disc, 4-Pitch synchronizing disc, 5-Pitch hub, 6-Auxiliary pitch generator shaft, 7-Generator front cover, 8-Auxiliary pitch generator rotor, 9-Copper sleeve, 10-Main generator shaft, 11-Main generator rotor, 12-Main and auxiliary generator set motor housing, 13-Main generator stator, 14-Generator set rear cover, 15-Auxiliary pitch motor rear cover, 16-Generator set rotating body, 17-Wire rope, 18-Wire rope pressure plate, 19-Blade, 20-Auxiliary pitch generator stator, 21-Second slewing bearing, 22-Wire rope lock, 23-First bearing, 24-Blade positioning block, 25-Second bearing, 26-Hub cover, 27-Tower assembly. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0017] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0018] Please see Figures 1-7This invention provides a self-torsion reluctance variable pitch wind turbine generator, comprising a generator set, a turbine slewing body 16, and a tower assembly 27. The generator set is connected to the tower assembly 27 via the turbine slewing body 16. The generator set includes a main generator, an auxiliary pitch generator, a main-auxiliary generator set motor housing 12, and blades 19. The main generator includes a main generator shaft 10, a main generator rotor 11, and a main generator stator 13. The auxiliary pitch generator includes an auxiliary pitch generator shaft 6, an auxiliary pitch generator rotor 8, and an auxiliary pitch generator stator 20. The main generator shaft 10 is mounted on the main-auxiliary generator set motor housing. Inside the housing 12, a pitch hub 5 is also provided at the shaft head of the main generator shaft 10. The auxiliary pitch generator shaft 6 passes through the main generator shaft 10, and a pitch synchronizing disk 4 is provided at the shaft head of the auxiliary pitch generator shaft 6. A first slewing bearing 2 is provided on the pitch hub 5, and a wire rope fixing blade connecting disk 3 is installed on the first slewing bearing 2. One end of the wire rope fixing blade connecting disk 3 is connected to the blade 19, and the other end of the wire rope fixing blade connecting disk 3 is wound with a wire rope 17. One end of the wire rope 17 is fixed to the pitch synchronizing disk 4, and the other end of the wire rope 17 is connected to a preload spring 1. Three sets of wire ropes 17 are provided.

[0019] In an embodiment of the invention, the power of the main generator is greater than that of the auxiliary pitch generator. The auxiliary pitch generator shaft 6 passes through the main generator shaft 10, making the two motors relatively independent yet interconnected. At rated power, the blades 19 drive the pitch hub 5 to rotate, causing the main generator shaft 10 and the auxiliary pitch generator shaft 6 to rotate synchronously and generate electricity together. When the wind speed is too high, the blades 19 drive the pitch hub 5 to rotate faster, increasing the generator set's power. When the auxiliary pitch generator exceeds its rated power, the preload of the preload spring 1 is insufficient to overcome the motor torque, causing the auxiliary pitch generator shaft 6 to deflect at an angle. This deflection drives the pitch synchronization disc 4 to pull the wire rope 17, thereby causing the wire rope to fix the blade connection disc 3 to rotate, which in turn causes the blades 19 to rotate synchronously by a certain angle, changing the windward working surface. This reduces the generator set's speed and power. When the auxiliary pitch generator drops to a predetermined power, the preload... Under the tension of the spring 1, the blade 19 rotates back, increasing its windward surface. When the torque and spring moment reach equilibrium, the blade 19 stops rotating, and the windward surface remains at a certain angle, maintaining the generator set's speed. Through repeated adjustments, the generator set is automatically controlled within its rated power range. The main generator rotor 11 is fixed to the main generator shaft 10, and the auxiliary pitch generator rotor 8 is mounted on the auxiliary pitch generator shaft 6. Compared to existing technologies, the reluctance pitch control of this invention is a passive, real-time pitch control without delay. It utilizes its own torque for pitch control, eliminating the need for external equipment. Control is simple, requiring only a normal controller. Even if the controller or generator fails, this invention will not cause a safety accident because the pitch system will remain at maximum pitch control, thus preventing accidents and effectively improving the safety performance of the wind turbine.

[0020] In one embodiment of the present invention, please refer to Figure 1 The pitch hub 5 is a five-way type, and three flanges for installing the first slewing bearing 2 are evenly distributed on the circumference of the pitch hub 5.

[0021] In one embodiment of the present invention, please refer to Figure 1 and Figure 5 The wire rope 17 passes through the pretension spring 1, and the wire rope 17 and the pretension spring 1 are connected by a wire rope buckle 22.

[0022] In one embodiment of the present invention, please refer to Figure 1 and Figure 5 The wire rope 17 is fixed to the wire rope fixing blade connecting disc 3 by the wire rope pressure plate 18.

[0023] In this embodiment, the wire rope pressure plate 18 can prevent the wire rope 17 from becoming loose from the wire rope fixing blade connecting disc 3, thereby improving the stability of the wind turbine during operation.

[0024] In one embodiment of the present invention, please refer to Figure 2 The main and auxiliary generator sets have a motor end cover inside the motor housing 12 for supporting the main generator shaft 10. The motor end cover includes a generator set front cover 7 and a generator set rear cover 14. The main generator shaft 10 is connected to the generator set front cover 7 and the generator set rear cover 14 through a first bearing 23.

[0025] In one embodiment of the present invention, please refer to Figure 2 The auxiliary pitch motor rear cover 15 is also provided inside the main and auxiliary generator set motor housing 12. One end of the auxiliary pitch generator shaft 6 is connected to the auxiliary pitch motor rear cover 15 through a second bearing 25, and the other end of the auxiliary pitch generator shaft 6 is supported by a copper sleeve 9.

[0026] In one embodiment of the present invention, please refer to Figure 2 and Figure 6 The unit's rotating body 16 is connected to the tower assembly 27 via a second slewing bearing 21.

[0027] In one embodiment of the present invention, please refer to Figure 3 The pitch hub 5 is also provided with a hub cap 26.

[0028] In one embodiment of the present invention, please refer to Figure 5 It also includes a blade positioning block 24 disposed on the wire rope fixing blade connecting disc 3.

[0029] In an embodiment of the present invention, during the initial installation, the zero position of blade 19 is first determined and fixed, and then the preload spring 1 is preloaded according to the power of the auxiliary pitch generator; for example, if the power of the auxiliary pitch generator is 5KW and the rated speed is 100r / min, T=477.5N•m is obtained from the formula T=9549*P / n, and the torque evenly distributed on the three springs is about 159N•m.

[0030] In summary, the working principle of this invention is as follows: Under rated power, blade 19 drives the pitch hub 5 to rotate, thereby causing the main generator shaft 10 and the auxiliary pitch generator shaft 6 to rotate synchronously and generate electricity together. When the wind speed is too high, the blade 19 drives the pitch hub 5 to rotate faster, resulting in a larger generator power. When the auxiliary pitch generator exceeds the rated power, the preload of the preload spring 1 is insufficient to overcome the motor torque, causing the auxiliary pitch motor shaft 6 to deflect at an angle. The deflected auxiliary pitch motor shaft 6 drives the pitch synchronization disc 4 to pull the wire rope 17, thereby causing the wire rope to fix the blade connecting disc 3 to rotate, which in turn causes the blade 19 to rotate synchronously at a certain angle, changing the windward working surface, thus reducing the generator speed and power. When the auxiliary pitch generator drops to the predetermined power, under the tension of the preload spring 1, the blade 19 rotates back to itself, increasing the windward surface of the blade 19. When the torque and the spring torque reach a balance, the blade 19 stops rotating, and the windward surface remains at a certain angle, maintaining the generator speed. Through repeated adjustments, the generator is automatically controlled within the rated power range.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A self-torsion reluctance variable pitch wind turbine generator, comprising a generator set, a rotating body of the generator set, and a tower assembly, characterized in that, The generator set is connected to the tower assembly via a rotating body. The generator set includes a main generator, an auxiliary pitch generator, a main / auxiliary generator set housing, and blades. The main generator includes a main generator shaft, a main generator rotor, and a main generator stator. The auxiliary pitch generator includes an auxiliary pitch generator shaft, an auxiliary pitch generator rotor, and an auxiliary pitch generator stator. The main generator shaft is housed within the main / auxiliary generator set housing. A pitch hub is located at the shaft end of the main generator shaft. The auxiliary pitch generator shaft passes through the main generator shaft, and a pitch synchronizing disc is located at the shaft end of the auxiliary pitch generator shaft. A first slewing bearing is located on the pitch hub, and a wire rope fixing blade connecting disc is mounted on the first slewing bearing. One end of the wire rope fixing blade connecting disc is connected to a blade, and the other end is wound with a wire rope. One end of the wire rope is fixed to the pitch synchronizing disc, and the other end is connected to a preload spring. Three sets of wire ropes are provided.

2. The self-torsional reluctance variable pitch wind turbine generator according to claim 1, characterized in that, The pitch hub adopts a five-way design, and three flanges for mounting the first slewing bearing are evenly distributed around the circumference of the pitch hub.

3. The self-torsional reluctance variable pitch wind turbine generator according to claim 1, characterized in that, The wire rope passes through the pretensioning spring, and the wire rope and the pretensioning spring are connected by a wire rope lock.

4. The self-torsional reluctance variable pitch wind turbine generator according to claim 1, characterized in that, The wire rope is fixed to the wire rope fixing blade connecting plate by a wire rope pressure plate.

5. The self-torsional reluctance variable pitch wind turbine generator according to claim 1, characterized in that, The main and auxiliary generator sets have motor end covers inside the motor housing for supporting the main generator shaft. The motor end covers include a front cover and a rear cover of the generator set. The main generator shaft is connected to both the front cover and the rear cover of the generator set via a first bearing.

6. The self-torsional reluctance variable pitch wind turbine generator according to claim 1, characterized in that, The main and auxiliary generator sets are also equipped with an auxiliary pitch motor rear cover inside the generator housing. One end of the auxiliary pitch generator shaft is connected to the auxiliary pitch motor rear cover through a second bearing, and the other end of the auxiliary pitch generator shaft is supported by a copper sleeve.

7. The self-torsional reluctance variable pitch wind turbine generator according to claim 1, characterized in that, The unit's rotating body is connected to the tower assembly via a second slewing bearing.

8. The self-torsional reluctance variable pitch wind turbine generator according to claim 1, characterized in that, The pitch hub is also equipped with a hub cap.

9. The self-torsional reluctance variable pitch wind turbine generator according to claim 1, characterized in that, It also includes a blade positioning block disposed on the steel wire rope fixing blade connecting disc.

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