Power supply device for variable pitch system of wind driven generator

Abstract

The utility model relates to a power supply device for a variable pitch system of a wind driven generator, which comprises a wind driven generator rotor and a driving motor, a variable pitch system generator is arranged at one end of the wind driven generator rotor connected with a hub, and one side of the variable pitch system generator far away from the hub is connected with the driving motor through a rotating shaft. The driving motor is fixedly connected with the wind driven generator through a motor support, and a storage battery is fixedly connected to one side of the motor support. The utility model relates to the technical field of wind driven generators. According to the power supply device for the variable-pitch system of the wind driven generator, through the arrangement of the variable-pitch system generator and the storage battery, current generated when the rotor of the wind driven generator drives the variable-pitch system generator to operate can be stored and used when the variable-pitch motor operates, the use efficiency of electric power can be improved, and waste of electric power resources is reduced; and meanwhile, power consumed during operation of the driving motor is saved, so that the practicability of the power supply device is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of wind turbines, in particular to a power supply device for a pitch control system of a wind turbine. Background Art

[0002] As one of the core parts of the control system of a large wind turbine unit, the pitch control system plays a very important role in the safe, stable and efficient operation of the unit. Stable pitch control has become one of the hotspots and difficulties in the research of control technology for large wind turbine units.

[0003] According to the power supply device for a pitch control system of a wind turbine disclosed in Chinese Patent Publication No. CN211655927U, the utility model discloses a power supply device for a pitch control system of a wind turbine, including a rotor of a wind turbine and a pitch control system generator. It is characterized in that the inside of the rotor of the wind turbine is hollow, the left end is connected to a hub, the pitch control system generator is arranged at one end close to the hub inside the rotor of the wind turbine, the external stator of the pitch control system generator is connected to the rotor of the wind turbine, and the internal rotor of the pitch control system generator is connected to a motor arranged outside the rotor of the wind turbine through a transmission shaft. The rated speed of the motor is greater than the operating speed of the rotor of the wind turbine. The utility model mainly utilizes the principle of non-contact energy transmission between the generator rotor and the stator, and supplies power to the pitch control system through the conversion of electrical energy - mechanical energy - electrical energy. This device has the characteristics of low cost, safety and reliability, and is suitable for cost-sensitive equipment such as medium-sized wind turbines.

[0004] According to the above patent, it uses a motor to drive the rotation of the rotor of the generator, and utilizes the speed difference between the rotor and the stator to supply power to the pitch control system generator, so as to achieve the effect of supplying power to the pitch control system of the wind turbine. When the motor stops running, the rotor of the pitch control system generator remains stationary, but the stator of the pitch control system generator will rotate together with the rotor of the wind turbine, causing the rotor and the stator of the pitch control system generator to rotate relative to each other to cut the magnetic induction lines to generate electricity, and the current of this part is not used, resulting in waste of electric power resources and affecting the practicability of the power supply device of the pitch control system. Summary of the Utility Model

[0005] Aiming at the deficiencies of the existing technology, the purpose of the utility model is to provide a power supply device for a pitch control system of a wind turbine, so as to solve the technical problems mentioned in the above background art.

[0006] The above technical purpose of the utility model is achieved through the following technical solutions:

[0007] The power supply device for the pitch control system of a wind turbine includes a wind turbine rotor and a drive motor. One end of the wind turbine rotor connected to the hub is provided with a pitch control system generator. The side of the pitch control system generator away from the hub is connected to the drive motor through a rotating shaft. The drive motor and the wind turbine are fixedly connected through a motor bracket. One side of the motor bracket is fixedly connected with a storage battery.

[0008] Further, it is characterized in that the pitch control system generator includes a stator and a rotor. The stator is fixedly connected to the wind turbine rotor. A rotor connected to the drive motor is rotatably arranged inside the stator. A magnetic bearing is arranged between the central axis of the rotor and the stator.

[0009] Further, it is characterized in that a circular groove for accommodating the central axis is opened inside the stator, and the diameter of the circular groove is larger than the diameter of the central axis.

[0010] Further, it is characterized in that a friction ring is fixedly connected inside the circular groove, and the inner side wall of the friction ring is processed with a smooth surface for reducing friction.

[0011] Further, it is characterized in that a rectifier is fixedly connected to the motor bracket. Both the magnetic bearing and the storage battery are electrically connected to the pitch control system generator through the rectifier.

[0012] Further, it is characterized in that couplings are arranged at both ends of the rotating shaft, and the two couplings are respectively connected to the rotor and the drive motor.

[0013] In summary, the present utility model includes at least one of the following beneficial technical effects:

[0014] 1. For the power supply device for the pitch control system of the wind turbine, by setting the pitch control system generator and the storage battery, the current generated when the wind turbine rotor drives the pitch control system generator to operate can be stored and used when the pitch motor operates. This can improve the power utilization efficiency, reduce the waste of power resources, and at the same time save the power consumed when the drive motor operates, thereby greatly improving the practicability of the power supply device.

[0015] 2. For the power supply device for the pitch control system of the wind turbine, by setting the magnetic bearing, the power generated during the operation of the pitch control system generator can be consumed to reduce the friction between the rotor and the stator, reduce the rotational load of the wind turbine rotor, and also avoid the situation where the power has nowhere to be used after the storage battery is fully charged, thereby further improving the power utilization rate and enhancing the practicability of the power supply device. Description of the Drawings

[0016] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the attached drawings required for the description of the embodiments. Obviously, the attached drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other attached drawings can be obtained based on these drawings.

[0017] Figure 1 It is a schematic structural diagram of a power supply device for a pitch control system of a wind turbine of the present utility model.

[0018] Figure 2 It is a schematic internal structure diagram of a power supply device for a pitch control system of a wind turbine of the present utility model.

[0019] Figure 3 It is a schematic structural diagram of a pitch generator in a power supply device for a pitch control system of a wind turbine of the present utility model.

[0020] Figure 4 It is a schematic structural diagram when the pitch generator in a power supply device for a pitch control system of a wind turbine of the present utility model stops rotating.

[0021] In the figure, 1 is the rotor of the wind turbine; 2 is the drive motor; 3 is the pitch system generator; 31 is the stator; 32 is the rotor; 4 is the motor bracket; 5 is the storage battery; 6 is the magnetic bearing; 7 is the circular groove; 8 is the friction ring; 9 is the rectifier; 10 is the coupling. Specific embodiments

[0022] The following will further elaborate on the present utility model in conjunction with the attached drawings.

[0023] Embodiment:

[0024] Referring to Figure 1 - Figure 4 , the power supply device for a pitch control system of a wind turbine disclosed by the present utility model includes a rotor 1 of the wind turbine and a drive motor 2. One end of the rotor 1 of the wind turbine connected to the hub is provided with a pitch system generator 3. The side of the pitch system generator 3 away from the hub is connected to the drive motor 2 through a rotating shaft. The drive motor 2 and the wind turbine are fixedly connected through a motor bracket 4. One side of the motor bracket 4 is fixedly connected with a storage battery 5.

[0025] In this embodiment, since the wind turbine rotor 1 is connected to the hub of the wind turbine and rotates driven by the hub, a pitch system generator 3 is provided at one end of the wind turbine rotor 1 close to the hub. At the same time, a storage battery 5 is installed on the motor bracket 4 for fixing the drive motor 2. The current generated by driving the pitch system generator 3 to operate when the wind turbine rotor 1 rotates can be stored, and used to supply power to the pitch motor when the wind turbine needs to pitch, which can effectively reduce the power loss and improve the practicability of the power supply device for the pitch system.

[0026] When the power in the storage battery 5 is used up and cannot continue to supply electrical energy to the pitch motor, the pitch motor of the wind turbine will lose power support and stop, causing the wind turbine to be unable to pitch and affecting the use of the wind turbine. Therefore, observing Figure 1 and Figure 2 it can be found that by starting the drive motor 2, driving the pitch system generator 3 to operate with the drive motor 2, and using the large speed difference generated between the drive motor 2 running at high speed and the wind turbine rotor 1, the pitch system generator 3 can generate electricity quickly, so that the pitch motor can quickly obtain sufficient power to resume operation and drive the blade to rotate, further ensuring the practicability of the power supply device for the pitch system and making the operation of the pitch motor more stable.

[0027] In a further preferred embodiment of the present invention, as Figure 3 shown, the pitch system generator 3 includes a stator 31 and a rotor 32. The stator 31 is fixedly connected to the wind turbine rotor 1. A rotor 32 connected to the drive motor 2 is rotatably arranged in the stator 31. A magnetic bearing 6 is provided between the central axis of the rotor 32 and the stator 31.

[0028] In this embodiment, by fixedly connecting the stator 31 of the pitch system generator 3 to the wind turbine rotor 1 and connecting the rotor 32 of the pitch system generator 3 to the drive motor 2, when the wind turbine operates, the wind turbine rotor 1 will drive the stator 31 to rotate, so that the stator 31 and the rotor 32 rotate relative to each other, causing the pitch system generator 3 to generate electricity for supplying power to the storage battery 5, which is convenient for supplying electrical energy to the pitch motor subsequently.

[0029] When the rotor 1 of the wind turbine drives the stator 31 to rotate, the stator 31 will rotate relative to the rotor 32 through bearings. When the bearings rotate, rolling friction will be generated, increasing the resistance to the rotation of the rotor 1 of the wind turbine. At the same time, the continuous rotation of the rotor 1 of the wind turbine will continuously charge the battery 5, and the power storage of the battery 5 has an upper limit. After being fully charged, the excess generated power will be wasted and not utilized. Therefore, as described above, magnetic bearings 6 are provided between the central axes on both sides of the rotor 32 and the stator 31. The magnetic levitation of the magnetic bearings 6 is used to keep the stator 31 and the rotor 32 from contacting each other, so that the rotation of the stator 31 will not increase the rotation resistance of the rotor 1 of the wind turbine, reducing the burden on the rotor 1 of the wind turbine. At the same time, the excess power after the battery 5 is fully charged can also be utilized, reducing the loss of electric energy, and effectively improving the practicability of the power supply device.

[0030] In a further preferred embodiment of the present invention, as Figure 3 and Figure 4 shown, a circular groove 7 for accommodating the central axis is formed in the stator 31, and the diameter of the circular groove 7 is larger than the diameter of the central axis.

[0031] In this embodiment, since magnetic bearings 6 are provided between the stator 31 and the rotor 32, when the stator 31 and the rotor 32 rotate relative to each other, the magnetic bearings 6 are powered to suspend the rotor 32 in the stator 31. Therefore, in order to prevent the rotor 32 from contacting and rubbing against the stator 31 when suspended, resulting in an increase in rotational resistance, a circular groove 7 for accommodating the central axis of the rotor 32 is formed in the stator 31. At the same time, the diameter of the circular groove 7 is larger than the diameter of the central axis, so that the central axis will not contact the stator 31 after the rotor 32 is suspended, achieving the effect of reducing rotational resistance.

[0032] In a further preferred embodiment of the present invention, as Figure 3 and Figure 4 shown, a friction ring 8 is fixedly connected in the circular groove 7, and the inner side wall of the friction ring 8 is processed with a smooth surface for reducing friction.

[0033] In this embodiment, since the magnetic bearings 6 are magnetically levitated under the support of electric power, when the wind turbine stops operating, the magnetic bearings 6 will lose the magnetic support and the levitation effect, causing the rotor 32 to contact the stator 31 under the action of gravity, resulting in the central axis of the rotor 32 contacting the inner wall of the circular groove 7 of the stator 31. When the wind turbine resumes operation, the central axis will contact the inner wall of the circular groove 7 and generate sliding friction, causing damage.

[0034] Therefore, observe Figure 4It can be found that a friction ring 8 is arranged in the circular groove 7, and the side wall of the friction ring 8 in contact with the central axis of the stator 31 is processed with a smooth surface. When the stator 31 rotates, the highly wear-resistant and smooth inner wall friction ring 8 undergoes sliding friction with the central axis, and the smooth inner wall can greatly reduce friction damage, thereby greatly reducing the wear generated before the magnetic bearing 6 starts, effectively extending the service life of the power supply device, and improving the practicability of the power supply device.

[0035] Among them, the above-mentioned friction ring 8 can be made of polymer materials such as PE and PI with good wear resistance, which can effectively reduce the wear between the rotor 32 and the stator 31 before the magnetic bearing 6 starts.

[0036] In a further preferred embodiment of the present invention, as Figure 1 shown, a rectifier 9 is fixedly connected to the motor bracket 4, and the magnetic bearing 6 and the storage battery 5 are both electrically connected to the pitch system generator 3 through the rectifier 9.

[0037] In this embodiment, since the current generated by the pitch system generator 3 is alternating current and cannot be directly charged into the storage battery 5, a rectifier 9 is provided on the motor bracket 4, so that the storage battery 5 is electrically connected to the pitch system generator 3 through the rectifier 9, which can be used to protect the storage battery 5.

[0038] By connecting the magnetic bearing 6 to the pitch system generator 3 through the rectifier 9, the magnetic bearing 6 can obtain a stable current, thereby ensuring the operating stability of the magnetic bearing 6.

[0039] In a further preferred embodiment of the present invention, as Figure 2 shown, couplings 10 are arranged at both ends of the rotating shaft, and the two couplings 10 are respectively connected to the rotor 32 and the drive motor 2.

[0040] In this embodiment, since there will inevitably be errors during the production of workpieces, when the drive motor 2 is connected to the rotor 32, it cannot be coaxial due to the existence of assembly tolerances, which affects the rotation of the rotor 32 and increases the operating load of the drive motor 2. Therefore, couplings 10 are arranged at both ends of the rotating shaft, and the two couplings 10 are respectively connected to the rotor 32 and the drive motor 2, which can be used to compensate for assembly tolerances and make the drive motor 2 drive the rotor 32 to rotate more smoothly.

[0041] The embodiments of this specific implementation manner are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore: All equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A power supply device for a wind turbine pitch control system, comprising a wind turbine rotor (1) and a drive motor (2), characterized in that: A variable pitch system generator (3) is provided at one end of the wind turbine rotor (1) connected to the wheel hub; the variable pitch system generator (3) is connected to a drive motor (2) via a rotating shaft on a side away from the wheel hub; the drive motor (2) and the wind turbine are fixedly connected via a motor bracket (4); and a storage battery (5) is fixedly connected to one side of the motor bracket (4).

2. The power supply device for the wind turbine pitch control system according to claim 1, characterized in that: The variable pitch system generator (3) comprises a stator (31) and a rotor (32), wherein the stator (31) is fixedly connected to the wind turbine rotor (1), a rotor (32) connected to the drive motor (2) is rotatably arranged inside the stator (31), and a magnetic bearing (6) is arranged between the central axis of the rotor (32) and the stator (31).

3. The power supply device for the wind turbine pitch control system according to claim 2, characterized in that: A circular groove (7) for accommodating the central axis is provided in the stator (31), and the diameter of the circular groove (7) is greater than the diameter of the central axis.

4. The power supply device for the wind turbine pitch control system according to claim 3, characterized in that: A friction ring (8) is fixedly connected inside the circular groove (7), and the inner side wall of the friction ring (8) is processed to have a smooth surface for reducing friction.

5. The power supply device for the wind turbine pitch control system according to claim 2, characterized in that: A rectifier (9) is fixedly connected to the motor bracket (4), and the magnetic bearing (6) and the battery (5) are electrically connected to the variable pitch system generator (3) through the rectifier (9).

6. The power supply device for the wind turbine pitch control system according to claim 2, characterized in that: Couplings (10) are provided at both ends of the rotating shaft, and the two couplings (10) are respectively connected to the rotor (32) and the driving motor (2).

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