Connection structure, rotor lead connection structure, rotor assembly, generator and wind turbine generator system

Abstract

The utility model discloses an embodiment provides a kind of connecting structure, rotor lead-out wire connecting structure, rotor assembly, generator and wind turbine generator unit, wherein, connecting structure is used to connect rotor winding end copper bar and lead-out copper bar, connecting structure includes: conductive connection main body, conductive connection main body inside has slot, rotor winding end copper bar and lead-out copper bar can be inserted into slot and mutually electrically connected by conductive connection main body.This embodiment is connected rotor winding end copper bar and lead-out copper bar using connecting structure, it is conducive to guarantee the electrical connection stability of rotor winding end copper bar and lead-out copper bar, so as to be conducive to the long time stable operation of generator when it is applied to generator.

Description

Technical Field

[0001] This utility model relates to the field of generators, specifically to a connection structure, a rotor lead wire connection structure, a rotor assembly, a generator, and a wind turbine generator set. Background Technology

[0002] Currently, after 6-7 years of operation, doubly-fed wind turbine generators are beginning to experience grid connection failures and rotor open circuits in large numbers, forcing them to be removed from the tower for repairs, increasing costs. Inspection and analysis indicate that the fault is typically a breakage between the copper busbars at the rotor winding ends and the lead-out copper busbars.

[0003] In the current rotor, the rotor winding is connected to the outside in sequence through the rotor winding end copper busbar, the lead copper busbar, and the slip ring. The rotor winding end copper busbar and the lead copper busbar are directly welded together. Since the rotor is a rotating component, after long-term operation, the connection between the rotor winding end copper busbar and the lead copper busbar is easily broken under the influence of vibration and centrifugal force. Utility Model Content

[0004] Therefore, the purpose of this utility model is to provide a connection structure, a rotor lead wire connection structure, a rotor assembly, a generator, and a wind turbine generator set. By connecting the rotor winding end copper busbar and the lead wire copper busbar through the connection structure, the connection between the rotor winding end copper busbar and the lead wire copper busbar can be prevented from breaking after the generator has been running for a long time.

[0005] A first aspect of this utility model provides a connection structure for connecting a lead-out copper busbar and a rotor winding end copper busbar. The connection structure includes a conductive connection body with a slot inside, wherein the rotor winding end copper busbar and the lead-out copper busbar can be inserted into the slot and electrically connected to each other through the conductive connection body.

[0006] Furthermore, in some embodiments, the conductive connection body includes: a first plate; and a second plate, spaced apart on one side of the first plate, with a slot formed between the first plate and the second plate.

[0007] Furthermore, in some embodiments, the conductive connection body further includes: a connection portion located between the first plate and the second plate, which divides the slot into a first slot and a second slot, wherein the rotor winding end copper busbar can be inserted into the first slot and the lead-out copper busbar can be inserted into the second slot.

[0008] Furthermore, in some embodiments, the conductive connection body further includes a connecting portion that connects the side portions of the first plate and the side portions of the second plate to each other.

[0009] Furthermore, in some embodiments, the conductive connection body is made of copper and is used for welding connection with the rotor winding end copper busbar and lead-out copper busbar; and / or the conductive connection body is an integral structure; and / or the slot depth is greater than or equal to 30mm.

[0010] A second aspect of this utility model provides a rotor lead wire connection structure, which includes: a rotor winding end copper busbar, a lead-out copper busbar, and a connection structure as described in any of the above embodiments. The rotor winding end copper busbar is connected to the lead-out copper busbar through the connection structure.

[0011] Furthermore, in some embodiments, the width of the lead-out copper busbar ranges from 20mm to 30mm, and the width of the connection structure is greater than or equal to the width of the lead-out copper busbar.

[0012] Furthermore, in some embodiments, the lead-out copper busbar has an L-shaped corner, the radius of which is between 4 and 6 times the thickness of the lead-out copper busbar.

[0013] Furthermore, in some embodiments, the lead-out copper busbar and the rotor winding end copper busbar are inserted into the slot from opposite ends of the slot, respectively; and / or the depth of insertion of the lead-out copper busbar and the rotor winding end copper busbar into the slot ranges from 30 mm to 50 mm.

[0014] A third aspect of this utility model provides a rotor assembly, which includes a rotor core, a rotor winding disposed on the rotor core, and a rotor lead wire connection structure as described in any of the embodiments, wherein the copper busbar at the end of the rotor winding is connected to the rotor winding.

[0015] A fourth aspect of this utility model provides a generator, including a rotor assembly as described in the third aspect of the present invention and a stator assembly coaxially disposed with the rotor assembly.

[0016] A fifth aspect of this utility model provides a wind turbine generator set, including the generator described in the fourth aspect above.

[0017] The connection structure provided in the first aspect of this utility model includes a conductive connection body. The rotor winding end copper busbar and the lead-out copper busbar are both inserted into the slots of the conductive connection body. The slots limit their movement, and the conductive connection body enables them to be electrically connected to each other. This ensures the electrical connection between the two and limits the rotor winding end copper busbar and the lead-out copper busbar from moving away from each other. This helps to ensure the stability of the electrical connection between the rotor winding end copper busbar and the lead-out copper busbar, thereby improving the stability of the generator during long-term operation when applied to a generator.

[0018] The rotor lead wire connection structure, rotor assembly, generator, and wind turbine generator set provided in this utility model embodiment have the beneficial effects of the first aspect embodiment due to the connection structure provided in the first aspect embodiment, which will not be repeated here.

[0019] Other aspects and / or advantages of the present invention will be set forth in part in the description which follows, and in part will be clear from the description or may be learned by practice of the present invention. Attached Figure Description

[0020] The above and other objects and features of this utility model will become clearer from the following description of embodiments in conjunction with the accompanying drawings, in which: Figure 1 This illustration shows a schematic diagram of the connection structure of an embodiment of the present application when it is connected together with the rotor winding end copper busbar and the lead-out copper busbar; Figure 2 This illustration shows another structural diagram of an embodiment of the present application when the connection structure is connected together with the rotor winding end copper busbar and the lead-out copper busbar; Figure 3 A schematic diagram of the end structure of a rotor according to an embodiment of this application is shown.

[0021] Figures 1 to 3 Explanation of icon numbers: 100 Conductive connection body; 101 First slot; 102 Second slot; 110 First plate; 120 Second plate; 130 Connecting part; 200 Rotor winding end copper busbar; 300 Lead-out copper busbar; 310 L-shaped corner; 400 Rotor winding; 500 Rotating shaft. Detailed Implementation

[0022] The following detailed embodiments are provided to aid the reader in gaining a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will become apparent upon understanding this disclosure. For example, the order of operations described herein is merely illustrative and is not limited to those orders set forth herein, but may be changed as will become clear upon understanding this disclosure, except for operations that must occur in a specific order. Furthermore, for clarity and conciseness, descriptions of features known in the art may be omitted.

[0023] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein, which will become clear upon understanding the disclosure of this application.

[0024] As used herein, the term “and / or” includes any one of the associated listed items and any combination of any two or more.

[0025] Although terms such as “first,” “second,” and “third” may be used herein to describe various components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts should not be limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Thus, without departing from the teaching of the examples described herein, the first component, first assembly, first region, first layer, or first part referred to as the first component, first assembly, first region, first layer, or first part may also be referred to as the second component, second assembly, second region, second layer, or second part.

[0026] In the specification, when an element such as a layer, region, or substrate is described as being "on" another element, "connected to," or "bonded to" another element, the element may be directly "on" another element, directly "connected to," or "bonded to" the other element, or one or more other elements may be present in between. Conversely, when an element is described as being "directly on" another element, "directly connected to," or "directly bonded to" another element, no other elements may be present in between.

[0027] The terminology used herein is for the purpose of describing various examples only and is not intended to limit disclosure. Unless the context clearly indicates otherwise, the singular form is intended to include the plural form as well. The terms “comprising,” “including,” and “having” indicate the presence of the described features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof. The term “a plurality” represents any quantity of two or more.

[0028] Unless otherwise specified, the directional terms used in this application are based on the directional terms shown in the diagram.

[0029] Unless otherwise defined, all terms used herein, including technical and scientific terms, shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains after understanding the invention. Unless expressly defined herein, terms such as those defined in a general dictionary shall be interpreted as having a meaning consistent with their meaning in the context of the relevant field and in this invention, and shall not be interpreted in an idealized or overly formalistic manner.

[0030] The following will combine Figures 1 to 3 This invention introduces the connection structure, rotor lead wire connection structure, and rotor assembly provided by embodiments of the present invention.

[0031] like Figure 1 and Figure 2 As shown, a first aspect embodiment of the present invention provides a connection structure for connecting a lead-out copper busbar 300 and a rotor winding end copper busbar 200. The connection structure includes a conductive connection body 100, which has a slot inside. The rotor winding end copper busbar 200 and the lead-out copper busbar 300 can be inserted into the slot and electrically connected to each other through the conductive connection body 100.

[0032] The connection structure provided in this embodiment includes a conductive connection body 100. The rotor winding end copper busbar 200 and the lead-out copper busbar 300 are both inserted into the slots of the conductive connection body 100. The slots limit the two and the conductive connection body 100 connects them electrically. This ensures the electrical connection between the two and limits the rotor winding end copper busbar 200 and the lead-out copper busbar 300 from moving away from each other. This helps to ensure the stability of the electrical connection between the rotor winding end copper busbar 200 and the lead-out copper busbar 300, thereby improving the stability of the generator during long-term operation when applied to a generator.

[0033] Furthermore, the conductive connection body 100 can be made of copper to facilitate conductivity.

[0034] Furthermore, the conductive connection body 100 can be welded to the lead-out copper busbar 300 and the rotor winding end copper busbar 200. Specifically, it is welded into a slot, ensuring a secure connection.

[0035] Furthermore, the conductive connection body 100 can be a one-piece structure, integrally molded. This results in a simple structure and convenient processing. Moreover, the conductive connection body 100 itself has high structural strength and is not easily deformed, allowing for better fixation of the rotor winding end copper busbar 200 and the lead-out copper busbar 300. This ensures an effective electrical connection between the rotor winding end copper busbar 200 and the lead-out copper busbar 300 even during long-term generator operation. Furthermore, the inclusion of slots within the one-piece conductive connection body 100 facilitates control over the slot's dimensional accuracy, allowing for the selection of appropriately sized slots for the rotor winding end copper busbar 200 and the lead-out copper busbar 300 to insert into, and ensuring their electrical connection to the conductive connection body 100.

[0036] Furthermore, the slot depth can be greater than or equal to 30mm. With this design, after the rotor winding end copper busbar 200 and lead-out copper busbar 300 are inserted into the slot, the connection structure can fully wrap around the rotor winding end copper busbar 200 and lead-out copper busbar 300, thereby improving the connection stability of the rotor winding end copper busbar 200 and lead-out copper busbar 300.

[0037] Regarding the specific shape and structure of the conductive connection body 100, further, in some embodiments, such as Figure 1 and Figure 2 As shown, the conductive connection body 100 includes a first plate 110 and a second plate 120. The second plate 120 is distributed at intervals on one side of the first plate 110, and a slot is formed between the first plate 110 and the second plate 120.

[0038] In these embodiments, the first plate 110 and the second plate 120 can limit the rotor winding end copper busbar 200 and the lead-out copper busbar 300 on both sides, which can increase the overall thickness at the connection between the two and improve the connection strength between the rotor winding end copper busbar 200 and the lead-out copper busbar 300, thereby preventing them from easily breaking or disconnecting.

[0039] Moreover, the rotor winding end copper busbar 200 and the lead-out copper busbar 300 can be electrically connected not only through the first plate 110, but also through the second plate 120, which helps to ensure the stability of the electrical connection between the two.

[0040] In practical applications, the copper busbars 200 at the ends of the rotor windings can be welded to the first plate 110 and the second plate 120 on both sides respectively, and the lead-out copper busbars 300 can also be welded to the first plate 110 and the second plate 120 on both sides respectively. This multi-position connection makes it less prone to breakage and separation.

[0041] Furthermore, such as Figure 1 and Figure 2 As shown, the conductive connection body 100 may also include a connection part 130, which connects the first plate 110 and the second plate 120 into one unit, thereby improving the overall structural strength of the connection structure. This facilitates the connection structure in fixing the rotor winding end copper busbar 200 and the lead-out copper busbar 300, and increases the electrical connection stability between the two.

[0042] In a specific embodiment, such as Figure 1 and Figure 2 As shown, the connecting part 130 can be located between the first plate 110 and the second plate 120, dividing the slot into the first slot 101 and the second slot 102. The rotor winding end copper busbar 200 can be inserted into the first slot 101, and the lead-out copper busbar 300 can be inserted into the second slot 102.

[0043] In this embodiment, the connecting portion 130 is located between the first plate body 110 and the second plate body 120, and divides the slot into a first slot 101 and a second slot 102. The rotor winding end copper bar 200 and the lead-out copper bar 300 can each be inserted into the corresponding slots, which facilitates the rapid installation of the rotor winding end copper bar 200 and the lead-out copper bar 300 in place and improves the assembly efficiency. Moreover, the first plate body 110, the second plate body 120 and the connecting portion 130 can limit the positions of the rotor winding end copper bar 200 and the lead-out copper bar 300 from three directions, which has a good limiting effect and can prevent the joint of the rotor winding end copper bar 200 and the lead-out copper bar 300 from breaking or separating. Furthermore, after the rotor winding end copper bar 200 and the lead-out copper bar 300 are inserted into the corresponding slots, both the rotor winding end copper bar 200 and the lead-out copper bar 300 can be brought into contact with the connecting portion 130, so that the two can realize electrical connection through the connecting portion 130, which can improve the electrical connection stability of the rotor winding end copper bar 200 and the lead-out copper bar 300.

[0044] Of course, in the specific installation process, the rotor winding end copper bar 200 can be welded to the first plate body 110, the second plate body 120 and the connecting portion 130 at the same time, and the lead-out copper bar 300 can be welded to the first plate body 110, the second plate body 120 and the connecting portion 130 at the same time, resulting in good connection stability.

[0045] Specifically, as Figure 1 and Figure 2 shown, the conductive connecting main body 100 may be generally H-shaped. Of course, the conductive connecting main body 100 may also be generally Ji-shaped, etc.

[0046] In addition, the groove depths of both the first slot 101 and the second slot 102 can be set to be greater than or equal to 30 mm, which facilitates sufficient connection between the connecting structure and both the rotor winding end copper bar 200 and the lead-out copper bar 300.

[0047] In another specific embodiment, the connecting portion 130 may also connect the side portion of the first plate body 110 and the side portion of the second plate body 120 to each other. At this time, the conductive connecting main body 100 may be generally C-shaped or square-shaped, and the conductive connecting main body 100 encloses the rotor winding end copper bar 200 and the lead-out copper bar 300 therein, which can effectively prevent the rotor winding end copper bar 200 and the lead-out copper bar 300 from separating from each other at the connection position. Furthermore, after the rotor winding end copper bar 200 and the lead-out copper bar 300 are inserted into the same slot, in addition to being connected to the conductive connecting main body 100, the rotor winding end copper bar 200 and the lead-out copper bar 300 can also be directly connected to each other, which can further improve the connection stability of the two and improve the electrical connection stability of the rotor winding end copper bar 200 and the lead-out copper bar 300.

[0048] As Figure 3As shown, a second aspect of the present invention provides a rotor lead wire connection structure, which includes: a rotor winding end copper busbar 200, a lead copper busbar 300, and a connection structure as described in any of the above embodiments. The rotor winding end copper busbar 200 is connected to the lead copper busbar 300 through the connection structure.

[0049] The rotor lead wire connection structure provided in this embodiment has the beneficial effects of any of the above embodiments due to having the connection structure of any of the above embodiments, and will not be described again here.

[0050] Furthermore, in some embodiments, such as Figures 1 to 3 As shown, the lead-out copper busbar 300 and the rotor winding end copper busbar 200 are inserted into the slot from opposite ends of the slot, respectively. This design reduces the length of the lead-out copper busbar 300 and the rotor winding end copper busbar 200, allowing them to be connected by a connecting structure, thus reducing material usage and saving costs. Moreover, the layout is reasonable, reducing the area occupied by the rotor winding end copper busbar 200, the lead-out copper busbar 300, and the connecting structure at the rotor end.

[0051] Of course, the lead-out copper busbar 300 and the rotor winding end copper busbar 200 can also be inserted into the slot from different positions. For example, the included angle between the two is 90°, etc.

[0052] Furthermore, in some embodiments, the depth to which the lead-out copper busbar 300 and the rotor winding end copper busbar 200 are inserted into the slot ranges from 30mm to 50mm. This design facilitates the connection structure to fully enclose the lead-out copper busbar 300 and the rotor winding end copper busbar 200, providing a good limiting effect and effectively preventing breakage or separation at the connection point of the lead-out copper busbar 300 and the rotor winding end copper busbar 200.

[0053] As an example, the depth to which the lead-out copper busbar 300 and the rotor winding end copper busbar 200 are inserted into the slot is 35mm, 40mm, or 50mm.

[0054] Furthermore, in some embodiments, such as Figure 1 As shown, the lead-out copper busbar 300 has an L-shaped bend 310L. This facilitates the bending and extension of the lead-out copper busbar 300 to the direction of the rotor winding end copper busbar 200, thereby facilitating the connection structure to connect the rotor winding end copper busbar 200 and the lead-out copper busbar 300 together.

[0055] Furthermore, the radius corresponding to the L-shaped corner 310L can be between 4 and 6 times the thickness of the lead-out copper busbar 300. This avoids stress concentration at the corner and prevents the lead-out copper busbar 300 from breaking at the bend, thus facilitating long-term generator operation.

[0056] In practical applications, the L-shaped corner 310L can be annealed, and its corresponding radius can be increased. For example, the radius of the L-shaped corner 310L can be 4 or 5 times the thickness of the lead-out copper busbar 300 to eliminate stress effects. Additionally, during assembly, the side of the L-shaped corner 310L furthest from the rotor winding end copper busbar 200 can be tightly fitted against the shaft 500, with the gaps wrapped in cotton felt and epoxy resin to ensure its integrity with the rotor shaft 500. This reduces the impact of vibrations generated during generator operation on the lead-out copper busbar 300.

[0057] Furthermore, in some embodiments, the width of the lead-out copper busbar 300 can be in the range of 20mm to 30mm, and the width of the connecting structure is greater than or equal to the width of the lead-out copper busbar 300. This design, on the one hand, increases the current-carrying cross-sectional area, preventing combustion damage at the connection between the lead-out copper busbar 300 and the rotor winding end copper busbar 200; on the other hand, using a larger connecting structure to connect with the lead-out copper busbar 300 helps ensure the stability and firmness of the connection between the two.

[0058] As an example, the width of the copper busbar 300 can be 25mm, 28mm, or 30mm. The thickness of the copper busbar 300 can be 6mm.

[0059] A third aspect of this utility model provides a rotor assembly, which includes a rotor core, a rotor winding 400 disposed on the rotor core, and a rotor lead wire connection structure as described in any of the embodiments, wherein the copper busbar 200 at the end of the rotor winding is connected to the rotor winding 400.

[0060] The rotor assembly provided in this embodiment has the rotor lead wire connection structure provided in any of the above embodiments, and thus has the beneficial effects of any of the above embodiments, which will not be repeated here.

[0061] Furthermore, the rotor assembly may also include a shaft 500 that extends into the space enclosed by the rotor core. A portion of the L-shaped bend 310L of the lead-out copper busbar 300 extends axially along the shaft 500 and is distributed parallel to the outer surface of the shaft 500. Another portion bends and extends along the end face of the rotor core, and is connected to the end copper busbar 200 of the rotor winding through a connection structure.

[0062] Furthermore, the rotor assembly may also include a slip ring, with a copper busbar 300 connected to the slip ring.

[0063] A fourth aspect of this utility model provides a generator, including a rotor assembly as described in the third aspect of the present invention and a stator assembly coaxially disposed with the rotor assembly.

[0064] The generator provided in this embodiment has the rotor assembly provided in any of the above embodiments, and thus has the beneficial effects of any of the above embodiments, which will not be repeated here.

[0065] A fifth aspect of this utility model provides a wind turbine generator set, including the generator described in the fourth aspect above.

[0066] The wind turbine generator set provided in this embodiment has the same beneficial effects as the generator provided in the fourth embodiment, which will not be repeated here. Furthermore, due to the good electrical connection stability between the rotor winding end copper busbar 200 and the lead-out copper busbar 300, the probability of generator failure, rotor open circuit, and grid connection failure can be reduced after long-term operation of the wind turbine generator set. This reduces the likelihood of generator removal from the tower for maintenance, lowers generator hoisting and maintenance costs, and improves the operational stability of the wind turbine generator set.

[0067] While the embodiments of the present invention have been described in detail above, those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope thereof. It should be understood that, to those skilled in the art, these modifications and variations will still fall within the spirit and scope of the embodiments of the present invention as defined in the claims.

Claims

1. A connection structure for connecting a rotor winding end copper busbar (200) and a lead-out copper busbar (300), characterized in that, The connection structure includes: The conductive connection body (100) has a slot inside, and the rotor winding end copper busbar (200) and the lead-out copper busbar (300) can be inserted into the slot and electrically connected to each other through the conductive connection body (100).

2. The connection structure according to claim 1, characterized in that, The conductive connection body (100) includes: First plate (110); The second plate (120) is spaced apart on one side of the first plate (110), and the slot is formed between the first plate (110) and the second plate (120).

3. The connection structure according to claim 2, characterized in that, The conductive connection body (100) further includes: The connecting part (130) is located between the first plate (110) and the second plate (120), dividing the slot into a first slot (101) and a second slot (102). The rotor winding end copper busbar (200) can be inserted into the first slot (101), and the lead-out copper busbar (300) can be inserted into the second slot (102).

4. The connection structure according to claim 2, characterized in that, The conductive connection body (100) further includes: The connecting part (130) connects the side of the first plate (110) and the side of the second plate (120) to each other.

5. The connection structure according to claim 1, characterized in that, The conductive connection body (100) is made of copper and is used for welding connection with the rotor winding end copper busbar (200) and the lead-out copper busbar (300); and / or The conductive connection body (100) is an integral structure; and / or The slot depth is greater than or equal to 30mm.

6. A rotor lead wire connection structure, characterized in that, The rotor lead wire connection structure includes: The rotor winding end copper busbar (200), the lead-out copper busbar (300), and the connection structure as described in any one of claims 1-5, wherein the rotor winding end copper busbar (200) is connected to the lead-out copper busbar (300) through the connection structure.

7. The rotor lead wire connection structure according to claim 6, characterized in that, The width of the lead-out copper busbar (300) ranges from 20mm to 30mm, and the width of the connection structure is greater than or equal to the width of the lead-out copper busbar (300).

8. The rotor lead wire connection structure according to claim 6, characterized in that, The lead-out copper busbar (300) has an L-shaped corner (310), and the radius corresponding to the L-shaped corner (310) is between 4 and 6 times the thickness of the lead-out copper busbar (300).

9. The rotor lead wire connection structure according to claim 6, characterized in that, The lead-out copper busbar (300) and the rotor winding end copper busbar (200) are respectively inserted into the slot from opposite ends of the slot; and / or The depth to which the lead-out copper busbar (300) and the rotor winding end copper busbar (200) are inserted into the slot ranges from 30 mm to 50 mm.

10. A rotor assembly, characterized in that, The rotor assembly includes a rotor core, a rotor winding disposed on the rotor core, and a rotor lead wire connection structure as described in any one of claims 6-9, wherein the copper busbar (200) at the end of the rotor winding is connected to the rotor winding.

11. A generator, characterized in that, It includes the rotor assembly as described in claim 10 and the stator assembly coaxially disposed with the rotor assembly.

12. A wind turbine generator set, characterized in that, Includes the generator as described in claim 11.

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