Outer rotor type generator rotor support, generator and wind generating set
By adopting a rotor support disc and flange with an annular structure in an external rotor wind turbine, combined with different bracket conveyors, it independently withstands bending moment and torque loads, the problem of excessive structural weight of multi-megawatt-class units is solved, and the More economical and simplified design.
Patent Information
- Application Number
- CN202420618118.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-28
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-03-28
AI Technical Summary
In external rotor direct drive wind turbines, the rotor brackets of multi-megawatt-class units need to withstand large bending moment loads and transmit large torque loads, resulting in excessive structural weight and poor economicality, and conventional conical plate structures cannot effectively solve this problem. A question.
The rotor support disc and flange with an annular structure are combined with the first and second types of bracket conveyors, which independently bear the bending moment load and the torque load transmission respectively, and save materials through the frame structure to achieve load decoupling.
A more economical rotor bracket design is achieved, simplifies the structure, reduces weight, improves the convenience of manufacturing and assembly, and avoids the problem of excessive weight of conventional solutions.
Smart Images
Figure CN222169436U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of wind power generation, and in particular relates to an outer rotor type generator rotor bracket, a generator and a wind power generator set. Background Art
[0002] Wind power is the most valuable and commercially viable power generation method in the renewable energy sector. Available wind energy is widely distributed around the world and has huge reserves.
[0003] A direct-drive wind turbine (abbreviated as "direct-drive generator") is a wind turbine in which the impeller directly drives the generator rotor to rotate to generate electricity without increasing speed through a gearbox. Direct-drive generators can be divided into outer rotor type and inner rotor type. Among them, inner rotor direct-drive generators are more common in small and medium-sized wind turbines. When the capacity of wind turbines becomes larger and larger, the weight of the outer rotor direct-drive generator is less than that of the inner rotor type, which can reduce the cost of the generator to a certain extent. Therefore, most wind turbines of megawatt level and above adopt an outer rotor structure.
[0004] In an external rotor direct-drive generator, considering factors such as cost, the excitation device of the rotor is usually fixed to the rotor bracket in a cantilever structure. This structure needs to solve two technical problems at the same time: 1) The rated power of multi-megawatt units is large and the speed is low, which leads to an increase in the volume of the excitation device, and the gravity load and magnetic pull of the excitation device itself increase. The rotor bracket needs to bear the gravity load of the excitation device and the bending moment load formed by the magnetic pull; 2) Whether the rotor bracket is connected to the driving shaft or directly connected to the hub, it needs to transmit mechanical torque load. As the motive force for the generator to generate electricity, the torque load gradually increases due to the characteristics of large rated power and low speed of multi-megawatt units.
[0005] The conventional technical solution sets the structure of the rotor bracket to a conical plate structure, which reduces the moment load arm. At the same time, since the plate structure is continuous in the circumferential direction, it can also achieve the function of transmitting torque load. However, this simple load-bearing form becomes less and less economical as the power of wind turbines increases. The direct reason is that the axial thickness and radial dimensions of the rotor bracket in the conventional technical solution are too large, resulting in excessive weight.
[0006] Therefore, it is necessary to provide a more economical solution while solving the technical problems of bearing bending loads and transmitting torque. Summary of the invention
[0007] In order to solve at least one of the above technical problems, in a first aspect, the utility model provides an outer rotor type generator rotor bracket, which includes a rotor support plate, a bracket carrier and a rotor flange;
[0008] The rotor support disk and the rotor flange are both annular structures, and the rotation axes of the rotor support disk and the rotor flange are collinear with the rotation axis of the rotor barrel of the generator; the rotor barrel of the generator is composed of at least a cylindrical support member and an excitation device mounted on the cylindrical support member;
[0009] The mounting surface of the rotor support plate is connected to one axial end of the rotor barrel; the rotor flange is arranged on the radial inner side of the rotor support plate; the bracket carrier connects the rotor support plate and the rotor flange;
[0010] The bracket carrier includes a first type of bracket carrier and a second type of bracket carrier; both ends of the first type of bracket carrier are connected to the mounting surface, and the first type of bracket carrier is tangentially connected to the radial or axial outer surface of the rotor flange; there are at least three first type of bracket carriers, and the geometric center line of the first type of bracket carrier along the length direction is parallel to the mounting surface;
[0011] One end of the second-type bracket carrier is connected to the axial outer surface of the rotor flange, and the axial outer surface of the rotor flange is located inside the rotor tube; the other end of the second-type bracket carrier is connected to the mounting surface; there are at least three second-type bracket carriers, and the angle between the geometric center line of the second-type bracket carrier along the length direction and the mounting surface of the rotor support disk is greater than 0 degrees and less than 20 degrees.
[0012] In a further technical solution, the axial thickness of the rotor support plate is smaller than the axial thickness of the rotor flange.
[0013] The connection points between the first type bracket carrier and the rotor support disk are evenly arranged along the circumference of the rotor support disk.
[0014] The connection points between the second type support carrier and the rotor flange are evenly arranged along the circumference of the rotor support disk.
[0015] The connection points between the first type of support carrier and the rotor support disk and the connection points between the second type of support carrier and the rotor support disk are arranged at intervals.
[0016] The geometric center line of the second type support carrier along the length direction passes through the rotation axis of the rotor support disk.
[0017] The first type of bracket carrier is made of profile or plate, and the second type of bracket carrier is made of profile.
[0018] The rotor flange is provided with joints on the axial outer surface inside the rotor barrel, and the number of the joints is the same as the number of the second-type bracket carriers.
[0019] In a second aspect, a generator is provided, comprising the outer rotor type generator rotor support.
[0020] In a third aspect, a wind turbine generator set comprises the above-mentioned generator.
[0021] The beneficial effect of the utility model is that two sets of different bracket transmission parts are provided in the rotor bracket, which can independently solve the technical problems of moment load bearing and torque transmission. The rotor bracket has a simple structure, light weight, easy processing and manufacturing, and is more economical than conventional solutions. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 A schematic diagram of an outer rotor type generator rotor bracket according to an embodiment of the utility model;
[0023] Figure 2 It is a schematic diagram of a rotor support and a rotor barrel of an outer rotor type generator according to an embodiment of the utility model;
[0024] Figure 3 A schematic diagram of a support carrier of an outer rotor type generator rotor support according to an embodiment of the utility model;
[0025] Figure 4 This is a schematic diagram of an outer rotor type generator rotor support and a rotor barrel end face in an embodiment of the utility model;
[0026] Figure 5 This is a cross-sectional view of an outer rotor type generator rotor bracket according to an embodiment of the utility model;
[0027] Figure 6 This is a front view of an outer rotor type generator rotor bracket according to an embodiment of the utility model.
[0028] Description of Figure Numbers:
[0029] 1. Rotor support plate, 1.1. Mounting surface, 2. Bracket transmission component, 2.1. First type bracket transmission component, 2.101. Geometric center line of first type bracket transmission component in length direction, 2.2. Second type bracket transmission component, 2.201. Geometric center line of second type bracket transmission component in length direction, 3. Rotor flange, 3.1. Joint, 4. Rotor barrel, 4.1. Excitation device, 5. Rotation axis of rotor support plate.
[0030] It is worth noting that the above drawings are used to illustrate the features of the utility model, and are not intended to show any actual structure or reflect the size, relative proportion and other detailed information of various components. In order to more clearly show the principle of the utility model and to avoid unnecessary details that make the principle of the utility model unclear, the examples in the figures have been simplified. These illustrations will not cause inconvenience to technicians in the relevant fields in understanding the utility model, and the actual embodiment may include more modules or components. DETAILED DESCRIPTION
[0031] In order to make the purpose and technical solution of the embodiment of the utility model clearer, the embodiment of the utility model is fully described below in conjunction with the relevant drawings of the embodiment of the utility model. This patent describes only a part of the embodiments, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.
[0032] like Figure 1 and Figure 2 As shown, an external rotor type generator rotor support is composed of a rotor support plate (1), a support carrier (2) and a rotor flange. The function of the generator rotor support is to support the rotor barrel (4) of the generator, and the support method can be regarded as a cantilever support. The rotor barrel (4) of the generator is composed of a cylindrical support member and an excitation device (4.1) installed on the cylindrical support member. In this embodiment, the generator rotor can be excited by a permanent magnet. That is, the excitation device (4.1) is a permanent magnet, the permanent magnet is installed on a yoke, and the yoke is installed on the cylindrical support member.
[0033] The rotor support disk (1) and the rotor flange (3) both adopt an annular structure with a certain thickness. The rotation axis (5) of the rotor support disk (1) and the rotation axis of the rotor flange (3) are collinear with the rotation axis of the rotor barrel (4) of the generator, that is, collinear with the rotation axis of the generator.
[0034] like Figure 1 As shown, specifically, the mounting surface (1.1) (hereinafter referred to as the "mounting surface") of the rotor support disk is connected to one axial end of the rotor barrel (4) by bolts. The rotor flange (3) is arranged on the radial inner side of the rotor support disk (1). In terms of placement, the rotor support disk (1) can be regarded as an "outer ring" and the rotor flange (3) is an "inner ring". The bracket carrier (2) is arranged between the rotor flange (3) and the rotor support disk (1), and its function is to connect the rotor support disk (1) and the rotor flange (3).
[0035] like Figure 1 and Figure 3As shown, the bracket carrier (2) can be divided into a first type bracket carrier (2.1) and a second type bracket carrier (2.2). Among them, both ends of the first type bracket carrier (2.1) are connected to the mounting surface. At the same time, in this embodiment, the first type bracket carrier (2.1) is tangentially connected to the radial outer surface of the rotor flange (3), and the connection position is located in the middle of the first type bracket carrier (2.1). In this embodiment, there are eight first type bracket carriers (2.1). In other embodiments, the number of first type bracket carriers (2.1) varies according to the size of the rotor support plate (1) and the rotor flange (3). For megawatt-class units, the number of first type bracket carriers (2.1) is larger. In this embodiment, the first type bracket carrier (2.1) is made of profiles, such as angle steel or I-beam (in other embodiments, a plate with a certain thickness can also be used according to actual conditions). Therefore, the first type of bracket carrier (2.1) has two geometric center lines: a geometric center line along the length direction and a geometric center line along the thickness direction. The geometric center line (2.101) of the first type of bracket carrier along the length direction is parallel to the mounting surface (1.1).
[0036] like Figure 4 As shown, one end of the second type bracket carrier (2.2) is connected to the axial outer surface of the rotor flange (3), and the axial outer surface of the rotor flange (3) is located inside the rotor barrel (4). In this embodiment, the other axial outer surface of the rotor flange (3) and the axial outer surface of the rotor support plate (1) (an axial outer surface that is not the mounting surface (1.1)) are aligned and are located outside the rotor barrel (4). The other end of the second type bracket carrier (2.2) is connected to the mounting surface (1.1). In this embodiment, there are also eight second type bracket carriers (2.2). The second type bracket carrier is made of profiles (such as angle steel or I-beam, etc.). Figure 5As shown, since the axial thickness of the rotor support plate (1) is less than the axial thickness of the rotor flange (3), the angle between the geometric center line (2.201) of the second type of support carrier along the length direction and the mounting surface (1.1) of the rotor support plate can be set to be greater than 0 degrees and less than 20 degrees, which is not a parallel relationship in the first type of support carrier (2.1). The reason why the angle range is defined between 0 degrees and 20 degrees is that the axial size of the direct-drive generator of megawatt level and above is much smaller than the radial size, resulting in the angle between the geometric center line (2.201) of the second type of support carrier along the length direction and the mounting surface (1.1) of the rotor support plate (1) being a small acute angle. Even under this angle setting, due to the small axial size of the direct-drive generator, the effective force arm of the gravity load and magnetic tension load of the rotor barrel (4) acting on the rotor support plate (1) and the second type of support carrier (2.2) is very short, and the resulting bending moment load is small, so that the second type of support carrier (2.2) can easily meet the bearing strength requirements. As shown in the figure, in the side cross-sectional view, the first type bracket transmission component (2.1), the second type bracket transmission component (2.2) and the rotor flange (3) can be regarded as forming a "triangle" structure. Among them, the long right-angled side of the "triangle" is the first type bracket transmission component (2.1), which is used to transmit torque load; the hypotenuse of the "triangle" is the second type bracket transmission component (2.2), which is used to bear bending moment load.
[0037] The advantages and benefits of the technical solution adopted by the utility model are mainly reflected in the following aspects:
[0038] Different from the conventional technical solution of thick plates, the utility model adopts a frame structure, which saves more materials and is more economical;
[0039] Using two types of support carriers (2) to independently bear different loads, thereby achieving load decoupling;
[0040] According to the different characteristics of the two types of loads, the structural characteristics of the first type of bracket carrier (2.1) and the second type of bracket carrier (2.2) are proposed to improve the utilization efficiency of the carrier material;
[0041] The structure is simple and the weight of each unit is small, which is very conducive to early assembly and later operation and maintenance.
[0042] like Figure 1 As shown, the connection points between the first type of support carrier (2.1) and the rotor support disk (1) are evenly arranged along the circumference of the rotor support disk (1). Similarly, the connection points between the second type of support carrier (2.2) and the rotor flange (3) are evenly arranged along the circumference of the rotor support disk (1).
[0043] In this embodiment, the connection point between the first type bracket carrier (2.1) and the rotor support plate (1) and the connection point between the second type bracket carrier (2.2) and the rotor support plate (1) are arranged at intervals. In some other embodiments, the above connection points may also be arranged together, but if a detachable connection method such as bolt connection is used, this will cause inconvenience in installation and maintenance. It may be considered to use welding or other methods according to actual conditions.
[0044] like Figure 5 As shown, the second type of bracket carrier passes through the rotation axis (5) of the rotor support disk along the geometric center line (2.201) in the length direction. Figure 6 From an angle of "looking down" along the axial direction, the geometric center line (2.201) of the second type bracket carrier along the length direction is actually colinear with the diameter of the rotor support disk (1) and the rotor flange (3). Since the second type bracket carrier (2.2) needs to withstand the bending moment load brought by the rotor barrel (4), and the bending moment load is distributed circumferentially, it is more reasonable to set the second type bracket carrier along the length direction. The geometric center line (2.201) passes through the rotation axis (5) of the rotor support disk.
[0045] like Figure 1 As shown, the rotor flange (3) is provided with joints (3.1) on the axial outer surface inside the rotor barrel (4) and the number of joints (3.1) is the same as that of the second type bracket carrier (2.2), which are used to connect with the end of the second type bracket carrier (2.2). The joint (3.1) itself has a certain thickness. The provision of the joint (3.1) can not only make the geometric center line (2.201) of the second type bracket carrier along the length direction and the mounting surface (1.1) form an acute angle, but also make the axial thickness of the rotor flange (3) not too thick, thereby effectively limiting the weight of the rotor flange (3).
[0046] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper, lower" etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0047] In this utility model, unless otherwise clearly specified and limited, the terms "install, connect, connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a mechanical connection, an electrical connection or a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.
[0048] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
Claims
1. An outer rotor type generator rotor support, characterized in that: It comprises a rotor support plate (1), a bracket carrier (2) and a rotor flange (3); The rotor support disk (1) and the rotor flange (3) are both annular structures, and the rotation axis (5) of the rotor support disk, the rotation axis of the rotor flange (3) and the rotation axis of the rotor barrel (4) of the generator are collinear; The rotor barrel (4) of the generator is composed of at least a cylindrical support and an excitation device (4.1) mounted on the cylindrical support; The mounting surface (1.1) of the rotor support disk is connected to one axial end of the rotor barrel (4); The rotor flange (3) is arranged on the radial inner side of the rotor support disk (1); the bracket carrier connects the rotor support disk (1) and the rotor flange (3); The bracket carrier (2) comprises a first-type bracket carrier (2.1) and a second-type bracket carrier (2.2); both ends of the first-type bracket carrier (2.1) are connected to the mounting surface, and the first-type bracket carrier (2.1) is tangentially connected to the radial or axial outer surface of the rotor flange (3); there are at least three first-type bracket carriers (2.1), and the geometric center lines (2.101) of the first-type bracket carriers along the length direction are parallel to the mounting surface; One end of the second-type bracket carrier (2.2) is connected to the axial outer surface of the rotor flange (3), and the axial outer surface of the rotor flange (3) is located inside the rotor tube (4); the other end of the second-type bracket carrier (2.2) is connected to the mounting surface; there are at least three second-type bracket carriers (2.2), and the angle between the geometric center line (2.201) of the second-type bracket carrier along the length direction and the mounting surface is greater than 0 degrees and less than 20 degrees.
2. The outer rotor type generator rotor support according to claim 1, characterized in that: The axial thickness of the rotor support plate (1) is smaller than the axial thickness of the rotor flange (3).
3. The outer rotor type generator rotor support according to claim 1, characterized in that: The connection points between the first type bracket carrier (2.1) and the rotor support disk (1) are evenly arranged along the circumference of the rotor support disk (1).
4. The outer rotor type generator rotor support according to claim 1, characterized in that: The connection points between the second type bracket carrier (2.2) and the rotor flange (3) are evenly arranged along the circumference of the rotor support disk (1).
5. The outer rotor type generator rotor support according to claim 1, characterized in that: The connection point between the first type of bracket carrier (2.1) and the rotor support disk (1) and the connection point between the second type of bracket carrier (2.2) and the rotor support disk (1) are arranged at intervals.
6. The outer rotor type generator rotor support according to claim 1, characterized in that: The geometric center line (2.201) of the second type of support carrier along the length direction passes through the rotation axis (5) of the rotor support disk.
7. The outer rotor type generator rotor support according to claim 1, characterized in that: The first type of bracket carrier (2.1) is made of profiles or plates, and the second type of bracket carrier (2.2) is made of profiles.
8. The outer rotor type generator rotor support according to claim 1, characterized in that: The rotor flange (3) is provided with joints (3.1) on the axial outer surface inside the rotor barrel (4), and the number of the joints (3.1) is the same as the number of the second type bracket carrier (2.2).
9. A generator, characterized in that: It comprises an outer rotor type generator rotor support as described in any one of claims 1-8.
10. A wind turbine generator set, characterized in that: A generator comprising the generator described in claim 9.