Wind driven generator rotor and wind driven generator

Abstract

The utility model relates to a wind driven generator rotor and a wind driven generator, and relates to the field of wind driven generators, the wind driven generator rotor comprises a rotor core, a rotor winding and a rotor shaft, and two ends of the rotor core are respectively provided with a first protective shell and a second protective shell. According to the utility model, a negative pressure area can be formed at one end of the rotor iron core through the first protective shell and the second protective shell, so that airflow can pass through the gap of the rotor iron core to take away part of heat generated by the rotor iron core during operation, and the purpose of heat dissipation is achieved.

Description

Technical Field

[0001] The utility model relates to the field of wind generators, in particular to a wind generator rotor and a wind generator. Background Art

[0002] A wind turbine is an electric device that converts wind energy into mechanical work, which then drives the rotor to rotate and finally outputs alternating current. It is mainly composed of wind turbines, generators (including devices), direction regulators (tail fins), towers, speed limit safety mechanisms, and energy storage devices. The rotor in a wind turbine is a key component that works with the stator inside the generator to generate electricity. The rotor and stator work together to efficiently convert mechanical energy into electrical energy.

[0003] At present, a Chinese utility model patent application with publication number CN220797904U and publication date November 4, 2021 proposes a wind turbine rotor, including a rotor support shaft rotatably connected to the main shaft of the wind turbine, the rotor support shaft is integrally connected to a coaxially configured rotor yoke through a rotor bracket radially connected to its outer periphery, a permanent magnet is installed on the outer ring position of the rotor yoke, and the rotor bracket includes a plurality of shock-absorbing arms equidistantly distributed in a spoke shape.

[0004] When in use, the permanent magnets of the rotor are installed in a concentrated magnetic manner to reduce the eccentricity of the rotor relative to the stator. The rotor bracket and the rotor yoke are arranged in one piece, and a number of shock-absorbing arms for absorbing vibrations are installed on the rotor bracket. When the rotor support shaft is subjected to vibration and / or yaw force, the force is transmitted through the shock-absorbing arms connected thereto.

[0005] Regarding the above-mentioned related technologies, when the rotor rotates at high load and high speed, a large amount of heat will be generated due to the inability of part of the magnetic field energy storage to be converted into electrical energy in time and the eddy current phenomenon. Especially in large wind turbines, the large amount of heat generated by the generator rotor under high load operation cannot be dissipated in time and effectively. Utility Model Content

[0006] In order to solve the problem that the heat generated by the wind generator rotor during high-load operation cannot be quickly dissipated, the utility model provides a wind generator rotor and a wind generator.

[0007] In a first aspect, the utility model provides a wind turbine rotor, which adopts the following technical solution:

[0008] A wind turbine rotor comprises a rotor core, a rotor winding and a rotor shaft; the rotor core is arranged on the periphery of the rotor shaft; the rotor core comprises a first protective shell, a second protective shell and a plurality of silicon steel sheets uniformly arranged along the axial direction of the rotor shaft, the silicon steel sheets are uniformly provided with winding parts, the first protective shell is arranged on the silicon steel sheets at the ends of the rotor core, the first protective shell is installed on the winding parts, one side of the first protective shell is installed on the silicon steel sheets in a plane, and an arc structure is arranged on a side of the first protective shell away from the silicon steel sheets, the second protective shell is arranged on the silicon steel sheets at the other end of the rotor core, the second protective shell is arranged on the winding parts, both end faces of the second protective shell are planar structures, one end face of the second protective shell is arranged on the silicon steel sheets, the first protective shell and the second protective shell are provided with through holes in a direction parallel to the silicon steel sheets, and the rotor winding is wound on the winding parts of the silicon steel sheets, the through holes of the first protective shell and the through holes of the second protective shell.

[0009] By adopting this technical solution, a first protective shell and a second protective shell are installed at both ends of the rotor core, one of the two end faces of the first protective shell is provided with an arc structure, and both end faces of the second protective shell are plane structures, and through holes for winding the rotor winding are provided on the first protective shell and the second protective shell, and the rotor windings at both ends of the rotor core are wrapped in the first protective shell and the second protective shell. In this way, when the rotor rotates, the air flow rate of the two end faces is different because one end is a plane structure and the other end is an arc structure. The air flow rate at one end of the arc structure is large, forming a negative pressure zone, driving the air to flow from the other end to the negative pressure zone along the gap between the winding parts, forming a circulating airflow to take away the heat generated by the rotor during operation, thereby achieving the purpose of cooling.

[0010] Optionally, the edges of the winding parts on the silicon steel sheets are respectively provided with limiting grooves, and the limiting grooves are arranged at the middle positions of the edges of the winding parts.

[0011] By adopting this technical solution, a limiting groove is set in the middle position of the winding part, and the rotor winding can be stuck in the limiting groove when it is wound on the silicon steel sheet. Setting the rotor winding in the limiting groove can prevent the rotor winding from deviating when the rotor is working, and at the same time, the rotor winding can be limited to the middle position of the winding part, so that a certain gap is left between the rotor winding and the two ends of the winding part, which can leave more space for the airflow to flow through the gap between the winding parts, so that the airflow can pass through and take away more heat.

[0012] Optionally, the silicon steel sheet is further provided with positioning holes, the first protective shell and the second protective shell are correspondingly provided with the positioning holes, and connecting rods are installed in the positioning holes.

[0013] By adopting this technical solution, positioning holes are cooperatively arranged on the silicon steel sheet, the first protective shell and the second protective shell, and connecting rods are installed in the positioning holes, so that the first protective shell and the second protective shell can be better fixed to the surface of the silicon steel sheet, and the displacement of the first protective shell and the second protective shell caused by air vibration when the rotor rotates can be effectively reduced.

[0014] Optionally, the positioning holes are arranged on both sides of the limiting groove of the winding part.

[0015] By adopting this technical solution, the positioning holes are arranged on both sides of the limiting groove, so that the first protective shell and the second protective shell can be fixed at both ends, and at the same time, the connecting rod installed in the positioning hole is prevented from affecting the installation of the rotor winding.

[0016] Optionally, a plurality of positioning structures are evenly arranged on the rotor shaft, and the positioning structures are evenly arranged around the outer surface of the rotor shaft, and positioning grooves are arranged on the silicon steel sheet to match the plurality of positioning structures.

[0017] By adopting this technical solution, the positioning groove on the silicon steel sheet is aligned with the positioning structure on the rotor shaft for installation. In this way, multiple positioning structures evenly arranged on the rotor shaft and the silicon steel sheet can evenly disperse the torque at the connection between the multiple positioning structures and the positioning groove when the rotor shaft drives the silicon steel sheet to rotate, thereby reducing the mechanical stress between the rotor shaft and the silicon steel sheet when the rotor rotates and extending the service life of the system.

[0018] Optionally, connecting arms are provided between the first protective shell and the rotor shaft, and between the second protective shell and the rotor shaft.

[0019] By adopting this technical solution, the first protective shell and the second protective shell are connected to the rotor shaft through the connecting arm respectively. When the rotor rotates at high speed, the first protective shell and the second protective shell will be subjected to centrifugal force pointing outward from the center of the circle, and the centrifugal force is offset by the connecting arm. In this way, the centrifugal force on the first protective shell and the second protective shell is offset by the connecting arm, which can prevent stress concentration on the connecting rod and extend the service life.

[0020] Optionally, the cross-sectional shape of the connecting arm is semicircular, and the planar end of the connecting arm is mounted on the surface of the silicon steel sheet.

[0021] By adopting this technical solution, after the planar end of the connecting arm is installed on the surface of the silicon steel sheet, the vibration caused by the sudden narrowing of the airflow through the airflow channel between the silicon steel sheet and the connecting arm when the rotor rotates at high speed can be reduced. At the same time, designing the other surface as a curved surface can reduce the air resistance of the connecting arm.

[0022] In a second aspect, the utility model provides a wind turbine generator, which adopts the following technical solution:

[0023] A wind generator comprises blades, a stator and the above-mentioned wind generator rotor, wherein the blades are connected to the rotor shaft of the wind generator rotor, and the stator is fixed to the periphery of the wind generator rotor.

[0024] Optionally, the blade is mounted on an end of the rotor shaft close to the second protective shell.

[0025] By adopting this technical solution, a negative pressure zone is formed at one end of the first protective shell, so that the airflow can flow from one end of the second protective shell to one end of the first protective shell, and the blades are oriented toward the wind. This arrangement can make the wind direction and the airflow direction of the rotor consistent, so that the heat of the rotor can be directly taken away by the airflow formed by the negative pressure zone, thereby further increasing the heat dissipation effect.

[0026] In summary, the present invention includes at least one of the following beneficial technical effects:

[0027] By installing the first protective shell and the second protective shell at both ends of the rotor core, the first protective shell adopts an arc structure and a through-hole design, which can accelerate the air flow in the negative pressure area formed during the rotation process and take away the heat between the rotor windings, thereby significantly improving the heat dissipation effect of the rotor and extending the service life of the rotor.

[0028] Setting a limit groove in the middle position of the rotor winding can effectively prevent the winding from shifting during high-speed rotation and ensure that the winding is always in the correct position. It not only improves the mechanical stability of the winding, but also leaves more gaps between the winding and the core, increasing the air flow channel and further improving the heat dissipation efficiency.

[0029] By setting positioning holes on the silicon steel sheet and the protective shell and firmly fixing the protective shell to the rotor with connecting rods, the displacement of the rotor due to air vibration during rotation is effectively prevented, the structural stability of the rotor during operation is ensured, and possible mechanical failures and maintenance costs are reduced.

[0030] Multiple positioning structures are evenly arranged on the rotor shaft, which cooperate with the positioning grooves on the silicon steel sheets to evenly disperse the torque at multiple joints, reduce mechanical stress concentration, and improve the overall stability and service life of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the generator rotor of Embodiment 1 of the utility model;

[0032] Figure 2 This is a schematic diagram of the generator rotor from another perspective of Embodiment 1 of the utility model;

[0033] Figure 3 This is a schematic diagram of the rotor shaft of Embodiment 1 of the present utility model;

[0034] Figure 4 This is a schematic diagram of a silicon steel sheet in Example 1 of the utility model;

[0035] Figure 5 This is a schematic diagram of the installation of the first protective shell of Example 1 of the utility model;

[0036] Figure 6 This is a schematic diagram of the installation of the second protective shell of Example 1 of the utility model;

[0037] Figure 7 It is a schematic diagram of a wind turbine according to Embodiment 2 of the present utility model.

[0038] Explanation of the accompanying drawings: 1. rotor core; 11. first protective shell; 111. through hole; 112. arc structure; 12. second protective shell; 13. silicon steel sheet; 131. winding part; 132. limiting groove; 133. positioning hole; 134. positioning groove; 14. connecting rod; 2. rotor winding; 3. rotor shaft; 31. positioning structure; 4. connecting arm; 5. blade; 6. stator. DETAILED DESCRIPTION

[0039] The following combination Figures 1 to 7 The utility model is described in further detail.

[0040] Embodiment 1: This embodiment discloses a wind turbine rotor. Figure 1 A wind turbine rotor mainly includes a rotor shaft 3 for rotation, a rotor core 1 arranged outside the rotor shaft 3, a first protective shell 11 installed at one end of the rotor core 1, a second protective shell 12 installed at the other end of the rotor core 1, and a rotor winding 2 installed on the rotor core 1.

[0041] Reference Figures 1 to 3 The rotor shaft 3 is a cylindrical structure. A plurality of positioning structures 31 are evenly arranged around the outer surface of the rotor shaft 3 in the middle of the rotor shaft 3. The positioning structures 31 are rectangular and arranged along the axial direction of the rotor shaft 3. The positioning structures 31 are fixed to the rotor shaft 3 by welding, and the mass and volume of each positioning structure 31 are exactly the same to ensure the rotation stability of the rotor shaft 3. The plurality of positioning structures 31 evenly arranged on the rotor shaft 3 can evenly disperse the torque at a plurality of joints when the rotor shaft 3 drives the silicon steel sheet 13 to rotate, thereby reducing the concentration of mechanical stress and extending the service life of the system.

[0042] Reference Figures 1 to 3The rotor core 1 is installed on the outside of the rotor shaft 3. The rotor core 1 includes a plurality of silicon steel sheets 13. A circular hole for installation on the rotor shaft 3 is provided at the center of the silicon steel sheet 13. A positioning groove 134 is provided on the circular hole to cooperate with the positioning structure 31 on the rotor shaft 3. During installation, the positioning groove 134 on the silicon steel sheet 13 is aligned with the positioning structure 31 on the rotor shaft 3. The plurality of silicon steel sheets 13 are sleeved on the rotor shaft 3 along the axial direction of the rotor shaft 3, and the silicon steel sheets 13 and the rotor shaft 3 are welded at the connection, so that the stacked silicon steel sheets 13 form the rotor core 1. By matching the positioning groove 134 on the silicon steel sheet 13 with the positioning structure 31 on the rotor shaft 3, the accurate installation of the silicon steel sheet 13 can be ensured, and the stability during rotation can be ensured.

[0043] Reference Figures 1 to 4 The silicon steel sheet 13 includes a winding portion 131, a limiting groove 132 and a positioning hole 133. A plurality of fan-shaped holes are evenly arranged on the silicon steel sheet 13. A winding portion 131 is formed between adjacent fan-shaped holes. The limiting groove 132 is arranged on both sides of the winding portion 131. The limiting groove 132 is an arc-shaped groove arranged in the middle position of the edge of the winding portion 131. The positioning hole 133 is arranged on the winding portion 131 of the silicon steel sheet 13. Each winding portion 131 has two positioning holes 133 on both sides of the limiting groove 132. The limiting groove 132 and the positioning hole 133 can ensure that the rotor winding 2 can be accurately positioned during the installation process to prevent the position from being offset. The limiting groove 132 is arranged in the middle to form a heat dissipation channel on the rotor core 1 after the installation is completed, thereby enhancing the heat dissipation effect.

[0044] Reference Figures 1 to 5 The first protective shell 11 is provided with a positioning hole 133 and a through hole 111. The first protective shell 11 is provided at one end of the rotor core 1. The cross-sectional shape of the first protective shell 11 is a sector shape, and the sector size of the first protective shell 11 is the same as the cross-sectional size between the limiting groove 132 of the winding part 131. One end face of the first protective shell 11 is a plane structure. The end face of the first protective shell 11 corresponding to the plane structure is provided with an arc structure 112. The plane end of the first protective shell 11 is installed on the winding part 131 of the silicon steel sheet 13. The positioning hole 133 is provided on the first protective shell 11. The first protective shell 11 is penetrated in the thickness direction of the first protective shell 11, the positions of the two positioning holes 133 correspond to the positions of the two positioning holes 133 on the winding part 131, the direction of the through hole 111 is perpendicular to the axial direction of the positioning holes 133 in the vertical plane, the through hole 111 is arranged between the two positioning holes 133, and the through hole 111 penetrates the first protective shell 11 transversely, and the first protective shell 11 is connected to the rotor shaft 3 through the connecting arm 4 after being installed on the winding part 131 through one end face close to the rotor shaft 3.

[0045] Reference Figures 1 to 6The second protective shell 12 is arranged at the other end of the rotor core 1. The difference in shape and structure between the second protective shell 12 and the first protective shell 11 is that one surface of the second protective shell 12 corresponding to the end surface of the arc structure 112 of the first protective shell 11 is a plane structure. The second protective shell 12 is also installed on the winding part 131 of the silicon steel sheet 13. After the second protective shell 12 is installed on the winding part 131, a surface close to the rotor shaft 3 is fixedly connected with a connecting arm 4, and the other end of the connecting arm 4 is fixedly connected to the rotor shaft 3. Through the cooperation between the first protective shell 11 and the second protective shell 12, a low-pressure area is formed at the arc structure 112 of the first protective shell 11 when the rotor rotates, which promotes air to flow from one end of the rotor core 1 to the other end, thereby enhancing the heat dissipation effect.

[0046] Reference Figures 1 to 6 The connecting rod 14 is installed in the positioning hole 133 of the first protective shell 11, the positioning hole 133 of the silicon steel sheet 13, and the positioning hole 133 of the second protective shell 12, and each connecting rod 14 passes through the corresponding first protective shell 11, the winding part 131 of the silicon steel sheet 13, and the second protective shell 12, and the two ends of the connecting rod 14 are fixed to the silicon steel sheet 13 at both ends of the rotor core 1 by welding. The connecting rod 14 can ensure the firm connection between the protective shell and the silicon steel sheet 13, prevent loosening or displacement during rotation, and enhance the overall structural stability of the rotor.

[0047] Reference Figures 1 to 6 The rotor winding 2 is made of copper wire and is wound on the rotor core 1 in a three-phase winding manner. When the rotor winding 2 is wound on the rotor core 1, it is wound on the limiting groove 132 of the winding part 131 of the silicon steel sheet 13, and passes through the through holes 111 of the first protective shell 11 and the second protective shell 12 at both ends of the rotor core 1. The rotor winding 2 is precisely installed on the limiting groove 132, which can prevent the winding from shifting during high-speed rotation and ensure the stability of the motor.

[0048] The implementation principle of this embodiment is as follows: a first and a second protective shell 12 are installed at both ends of the generator rotor core 1, and an airflow negative pressure zone is formed by the arc structure 112 of the first protective shell 11 arranged at one end of the rotor core 1 and the plane structure of the second protective shell 12 arranged at the other end of the rotor core 1, so as to enhance the air flow and thus enhance the heat dissipation effect; a positioning structure 31 is used on the silicon steel sheet 13 to ensure the precise installation of the silicon steel sheet 13, and a limit groove 132 is provided to ensure the precise positioning and fixation of the rotor winding 2 to prevent the winding from shifting during high-speed rotation; the first protective shell 11 and the second protective shell 12 are connected to the rotor shaft 3 by the connecting arm 4, so as to ensure that the first protective shell 11 and the second protective shell 12 are stably installed on the surface of the silicon steel sheet 13, thereby enhancing the mechanical stability and durability of the rotor.

[0049] Embodiment 2: This embodiment discloses a wind turbine generator, referring to Figure 7A wind turbine includes blades 5, a generator stator 6 and the above-mentioned generator rotor, the generator rotor is installed in the generator stator 6 for operation, and the rotor shaft 3 of the generator rotor is connected to the blades 5.

[0050] The generator rotor is rotatably connected to the generator stator 6 by installing the rotor shaft 3 on a fixed bearing seat, and the end of the generator rotor installed with the first protective shell 11 is installed away from the wind turbine blades 5. In this way, the first protective shell 11 can form a negative pressure area so that the direction of the airflow from the second protective shell 12 to the first protective shell 11 is consistent with the direction of the wind, and the heat of the rotor can be taken away by the wind after being taken away by the airflow formed by the negative pressure area, thereby further increasing the heat dissipation effect.

[0051] The above are all preferred embodiments of the present utility model, and are not intended to limit the protection scope of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A wind turbine rotor, characterized in that: The invention comprises a rotor core (1), a rotor winding (2), and a rotor shaft (3); the rotor core (1) is arranged on the periphery of the rotor shaft (3); the rotor core (1) comprises a first protective shell (11), a second protective shell (12), and a plurality of silicon steel sheets (13) uniformly arranged along the axial direction of the rotor shaft (3); winding parts (131) are uniformly arranged on the silicon steel sheets (13); the first protective shell (11) is arranged on the silicon steel sheets (13) at the ends of the rotor core (1); the first protective shell (11) is installed on the winding parts (131); one side of the first protective shell (11) is installed on the silicon steel sheets (13) in a flat manner; and one side of the first protective shell (11) away from the silicon steel sheets (13) is provided with an arc-shaped structure. The rotor core (1) comprises a rotor structure (112), wherein the second protective shell (12) is arranged on the silicon steel sheet (13) at the other end of the rotor core (1), the second protective shell (12) is arranged on the winding portion (131), both end faces of the second protective shell (12) are planar structures, one end face of the second protective shell (12) is arranged on the silicon steel sheet (13), the first protective shell (11) and the second protective shell (12) are provided with through holes (111) in a direction parallel to the silicon steel sheet (13), and the rotor winding (2) is wound on the winding portion (131) of the silicon steel sheet (13), the through holes (111) of the first protective shell (11) and the through holes (111) of the second protective shell (12).

2. A wind turbine rotor according to claim 1, characterized in that: Limiting grooves (132) are respectively provided at the edges of the winding portion (131) on the silicon steel sheet (13), and the limiting grooves (132) are arranged at the middle position of the edge of the winding portion (131).

3. A wind turbine rotor according to claim 2, characterized in that: The silicon steel sheet (13) is also provided with a positioning hole (133), the first protective shell (11) and the second protective shell (12) are correspondingly provided with the positioning hole (133), and a connecting rod (14) is installed in the positioning hole (133).

4. A wind turbine rotor according to claim 3, characterized in that: The positioning holes (133) are arranged on both sides of the limiting groove (132) of the winding part (131).

5. A wind turbine rotor according to any one of claims 1 to 4, characterized in that: A plurality of positioning structures (31) are evenly arranged on the rotor shaft (3), and the positioning structures (31) are evenly arranged around the outer surface of the rotor shaft (3). The silicon steel sheet (13) is provided with positioning grooves (134) in coordination with the plurality of positioning structures (31).

6. A wind turbine rotor according to any one of claims 1 to 4, characterized in that: Connecting arms (4) are provided between the first protective shell (11) and the rotor shaft (3), and between the second protective shell (12) and the rotor shaft (3).

7. A wind turbine rotor according to claim 6, characterized in that: The cross-sectional shape of the connecting arm (4) is semicircular, and the plane end of the connecting arm (4) is mounted on the surface of the silicon steel sheet (13).

8. A wind turbine generator, characterized in that: It comprises blades (5), a stator (6) and a wind turbine rotor according to any one of claims 1 to 7, wherein the blades (5) are connected to the rotor shaft (3) of the wind turbine rotor, and the stator (6) is fixed to the periphery of the wind turbine rotor.

9. A wind turbine according to claim 8, characterized in that: The blade (5) is mounted on one end of the rotor shaft (3) close to the second protective shell (12).

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