Stator lead connection structure and wind turbine

Abstract

The present invention discloses a stator lead connection structure and a wind turbine generator, and relates to the technical field of motor structure. The stator lead connection structure comprises a lead wire and a connecting conductive bar, the lead wire comprises a first connecting section, a second connecting section and a third connecting section, one end of the first connecting section is used to be electrically connected to the stator lead pin, and the other end is simultaneously connected to the second connecting section and the third connecting section, and the second connecting section and the third connecting section are respectively overlapped on two corresponding side surfaces of the connecting conductive bar. The stator lead connection structure and the wind turbine generator have the characteristics of good contact.

Description

Technical Field

[0001] The present invention relates to the technical field of motor structures, and in particular to a stator lead connection structure and a wind turbine generator. Background Art

[0002] As the power and power density of generators increase, the requirements for motor lead wires are getting higher and higher. Especially for wind turbines, the use environment is more severe. In actual use, it is easy for the motor lead wires to have poor contact with the copper busbar, resulting in excessive local current, excessive temperature rise, and lead wire burnout.

[0003] In view of this, it is particularly important to develop and design a stator lead connection structure and a wind turbine generator that can solve the above technical problems. Summary of the invention

[0004] The object of the present invention is to provide a stator lead connection structure, which has the characteristic of good contact.

[0005] The present invention provides a technical solution:

[0006] In a first aspect, an embodiment of the present invention provides a stator lead connection structure, including a lead wire and a connecting conductive bar, the lead wire including a first connecting segment, a second connecting segment and a third connecting segment; one end of the first connecting segment is used to be electrically connected to the stator lead pin, and the other end is simultaneously connected to the second connecting segment and the third connecting segment; the second connecting segment and the third connecting segment are respectively overlapped on two corresponding side surfaces of the connecting conductive bar.

[0007] In combination with the first aspect, in a first implementation of the first aspect, the second connecting section and the third connecting section are both formed by stacking multiple conductive sheets, and the first connecting section is formed by extending and stacking the multiple conductive sheets together.

[0008] In combination with the first aspect and the above implementation manner, in a second implementation manner of the first aspect, the second connecting section and the third connecting section are both connected to the connecting conductive bar by sealing welding.

[0009] In combination with the first aspect and its above-mentioned implementation manner, in a third implementation manner of the first aspect, the stator lead connection structure also includes a fixing component, and the fixing component includes a fixing bolt, a fixing nut and a holding plate; the fixing bolt is sequentially passed through the second connecting segment, the connecting conductive bar and the third connecting segment, the fixing nut is connected to the fixing bolt, and together with the head of the fixing bolt, clamps the second connecting segment, the connecting conductive bar and the third connecting segment, and the holding plate is located between the second connecting segment and the connecting conductive bar, or between the connecting conductive bar and the third connecting segment.

[0010] In combination with the first aspect and its above-mentioned implementation methods, in a fourth implementation method of the first aspect, the stator lead connection structure also includes a step piece, and one side of the step piece has a plurality of connection steps; the number of the connecting conductive bars and the lead-out wires are both multiple, and the multiple connecting conductive bars are connected one by one to the multiple connection steps.

[0011] In combination with the first aspect and the above-mentioned implementation manner, in a fifth implementation manner of the first aspect, the connecting conductive row includes a first connecting conductive portion and a second connecting conductive portion, the first connecting conductive portion and the second connecting conductive portion are arranged at a right angle, and the first connecting conductive portion is connected to the connecting step; the second connecting segment and the third connecting segment are respectively overlapped on two corresponding side surfaces of the second connecting conductive portion.

[0012] In combination with the first aspect and the above-mentioned implementation manner, in a sixth implementation manner of the first aspect, the stator lead connection structure includes a plurality of the step members, a gap is provided between two adjacent step members, and the second connection conductive portions of each of the plurality of connection conductive bars are located within the same gap.

[0013] In combination with the first aspect and its above-mentioned implementation manner, in the seventh implementation manner of the first aspect, the stator lead connection structure also includes a connection box, a wall with an opening in the connection box is a connection wall, and the connection wall is used to correspond to the stator lead pin; the side of the step member away from the connection step is connected to the connection wall, and the second connection conductive part extends toward the connection wall, and the lead wire can be connected to the stator lead pin by the connection wall.

[0014] In combination with the first aspect and its above-mentioned implementation methods, in an eighth implementation method of the first aspect, there is a gap between the projections of each of the connections between the multiple second connecting conductive parts and the second connecting segment in a first direction, and the first direction is a direction perpendicular to the first connecting conductive parts and located in a common plane of the multiple first connecting conductive parts.

[0015] In a second aspect, an embodiment of the present invention further provides a wind turbine, comprising the stator lead connection structure of the power generation body, wherein the power generation body is provided with the stator lead pin. The stator lead connection structure comprises a lead wire and a connecting conductive bar, wherein the lead wire comprises a first connecting section, a second connecting section and a third connecting section; one end of the first connecting section is used to electrically connect to the stator lead pin, and the other end is simultaneously connected to the second connecting section and the third connecting section; the second connecting section and the third connecting section are respectively overlapped on the two corresponding side surfaces of the connecting conductive bar.

[0016] Compared with the prior art, the stator lead connection structure and the wind turbine generator provided by the embodiments of the present invention have the following beneficial effects over the prior art:

[0017] The stator lead connection structure includes a lead wire and a connection conductive bar, wherein the lead wire includes a first connection segment, a second connection segment and a third connection segment, and one end of the first connection segment is used to electrically connect to the stator lead pin, and the other end of the first connection segment is connected to the second connection segment and the third connection segment at the same time, and the second connection segment and the third connection segment are respectively overlapped on two corresponding side surfaces of the connection conductive bar. In this way, the contact area between the lead wire and the connection conductive bar is increased by connecting the second connection segment and the third connection segment respectively through two corresponding side surfaces of the connection conductive bar, reducing the probability of poor contact, and ensuring good contact between the lead wire and the connection conductive bar.

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative work.

[0020] Figure 1 A schematic diagram of the structure of a wind turbine generator in which the stator lead connection structure provided by an embodiment of the present invention is applied;

[0021] Figure 2 A schematic structural diagram of a stator lead connection structure provided in an embodiment of the present invention;

[0022] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure at BB in the middle.

[0023] Icons: 100-wind turbine; 20-power generation body; 21-stator lead pin; 10-stator lead connection structure; 12-lead wire; 121-first connecting section; 122-second connecting section; 123-third connecting section; 15-connecting conductive bar; 151-first connecting conductive part; 152-second connecting conductive part; 17-fixing assembly; 171-fixing bolt; 172-fixing nut; 173-elastic washer; 174-holding plate; 18-connecting box; 181-connecting wall; 182-opening; 19-step member; 191-connecting step. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. The orientation or position relationship indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship usually placed when the invention product is used, or the orientation or position relationship commonly understood by those skilled in the art. It 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 of the present invention. The terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. The terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a process, method, article or device. Without more constraints, an element defined by the phrase "comprising a..." does not exclude the existence of other identical elements in the process, method, article or apparatus comprising the element.

[0026] It should also be noted that, unless otherwise clearly specified and limited, the terms "disposed", "connected" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings.

[0028] Example:

[0029] See also Figure 1 , Figure 1 A schematic structural diagram of a stator lead connection structure 10 provided in an embodiment of the present invention applied to a wind turbine 100.

[0030] The embodiment of the present invention provides a stator lead wire connection structure 10, which has the characteristic of good contact and can be applied to connection structures such as hydroelectric power generation, wind turbine generator 100 and electric motor.

[0031] Among them, taking the stator lead connection structure 10 applied to the wind turbine 100 as an example, the wind turbine 100 includes a stator lead connection structure 10 and a power generation body 20, and a stator lead pin 21 is provided on the power generation body 20. The stator lead connection structure 10 is used to connect the stator lead pin 21 to connect other circuit elements through the stator lead connection structure 10. It can be understood that the power generation body 20 may include a stator (not shown) and a rotor (not shown), and the stator lead pin 21 is connected to the coil of the stator.

[0032] Since the wind turbine 100 adopts the stator lead connection structure 10 provided by the embodiment of the present invention, the wind turbine 100 also has the characteristic of good contact.

[0033] The structural composition, working principle and beneficial effects of the stator lead connection structure 10 provided in an embodiment of the present invention will be specifically introduced below.

[0034] See also Figure 2 and Figure 3 , Figure 2 A schematic structural diagram of a stator lead connection structure 10 provided in an embodiment of the present invention. Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure at BB in the middle. Figure 2 , the direction indicated by the arrow is the first direction.

[0035] The stator lead connection structure 10 includes a lead wire 12 and a connecting conductive bar 15, wherein the lead wire 12 includes a first connecting segment 121, a second connecting segment 122 and a third connecting segment 123, and one end of the first connecting segment 121 is used to be electrically connected to the stator lead pin 21, and the other end of the first connecting segment 121 is simultaneously connected to the second connecting segment 122 and the third connecting segment 123, and the second connecting segment 122 and the third connecting segment 123 are respectively overlapped on two corresponding side surfaces of the connecting conductive bar 15. In other words, the second connecting segment 122 and the third connecting segment 123 are respectively overlapped on two side surfaces of the connecting conductive bar 15 one above and one below or one left and one right.

[0036] In this way, the second connecting section 122 and the third connecting section 123 are respectively connected by two corresponding side surfaces of the connecting conductive bar 15, thereby increasing the contact area between the lead wire 12 and the connecting conductive bar 15, reducing the probability of poor contact, and ensuring that the lead wire 12 and the connecting conductive bar 15 are in good contact.

[0037] Furthermore, the second connecting section 122 and the third connecting section 123 can both be formed by stacking multiple conductive sheets, and the first connecting section 121 is formed by extending and stacking the above-mentioned multiple conductive sheets (not shown). In other words, the first connecting section 121 is formed by stacking multiple conductive sheets, and the second connecting section 122 and the third connecting section 123 are formed by dividing the first connecting section 121 into two strands. In this way, the two separated strands are connected to the connecting conductive bar 15, so that the connection between the lead wire 12 and the connecting conductive bar 15 is more stable.

[0038] It should be noted that the above-mentioned overlapping formation refers to the overlapping welding of multiple conductive sheets, or refers to connecting multiple overlapping conductive sheets by other connection methods. In addition, the above-mentioned lead wire 12 is a flexible wire, that is, after the multiple conductive sheets are overlapped, they can be bent in the direction perpendicular to the conductive sheets, thereby reducing the probability of the lead wire 12 and the connecting conductive bar 15 being loosened due to the vibration of the power generation body 20 or the connecting conductive bar 15, and further improving the stability of the connection between the lead wire 12 and the connecting conductive bar 15.

[0039] Furthermore, the second connection segment 122 and the third connection segment 123 may be connected to the connection conductive bar 15 by sealing welding, so as to further improve the stability of the second connection segment 122 and the third connection segment 123 connected to the connection conductive bar 15 .

[0040] Furthermore, the stator lead connection structure 10 may also include a fixing component 17, which includes a fixing bolt 171, a fixing nut 172 and a holding piece 174, wherein the fixing bolt 171 is sequentially penetrated through the second connection section 122, the connection conductive bar 15 and the third connection section 123, and the fixing nut 172 is connected to the fixing bolt 171, and together with the head of the fixing bolt 171, clamps the second connection section 122, the connection conductive bar 15 and the third connection section 123 to fix the second connection section 122 and the third connection section 123 to the connection conductive bar 15, and the holding piece 174 is located between the second connection section 122 and the connection conductive bar 15, or between the connection conductive bar 15 and the third connection section 123, and the second connection section 122 or the third connection section 123 is pressed to the connection conductive bar 15 by the holding piece 174, so as to further improve the stability of the second connection section 122 and the third connection section 123 connected to the connection conductive bar 15.

[0041] It should be noted that the number of the holding plates 174 can also be two, and the two holding plates 174 are respectively located between the second connecting section 122 and the connecting conductive bar 15, and between the connecting conductive bar 15 and the third connecting section 123. In addition, the fixing component 17 can also include an elastic washer 173, which is located between the head of the fixing bolt 171 and the holding plate 174, and between the fixing nut 172 and the holding plate 174. The elastic washer 173 can be a wave washer and an opening 182 spring washer, etc.

[0042] Please continue reading Figure 2 and Figure 3 The stator lead connection structure 10 may further include a step member 19, one side of which is provided with three connection steps 191, and the number of the connection conductive bars 15 and the number of the lead wires 12 are both three, and the three connection conductive bars 15 are connected to the three connection steps 191 one by one. The connection conductive bars 15 are staggered, which improves the convenience of installation and maintenance, and facilitates heat dissipation of the lead wires 12 and the connection conductive bars 15.

[0043] It should be noted that in other embodiments, one side of the step member 19 may be provided with other numbers of connecting steps 191 , and the numbers of connecting conductive bars 15 and lead wires 12 may also be other numbers, and multiple connecting conductive bars 15 are connected one by one to multiple connecting steps 191 .

[0044] Furthermore, the connecting conductive row 15 includes a first connecting conductive portion 151 and a second connecting conductive portion 152, the first connecting conductive portion 151 and the second connecting conductive portion 152 are arranged at a right angle, and the first connecting conductive portion 151 is connected to the connecting step 191, and the second connecting segment 122 and the third connecting segment 123 are respectively overlapped on two corresponding side surfaces of the second connecting conductive portion 152.

[0045] It should be noted that, in this embodiment, the first connecting conductive portion 151 and the second connecting conductive portion 152 are formed by bending a copper bar, and the conductive sheet is a copper sheet.

[0046] Furthermore, the stator lead connection structure 10 may include three step parts 19, and there is a gap between two adjacent step parts 19, and the second connecting conductive parts 152 of each of the multiple connecting conductive bars 15 are all located in the same gap. In other words, the three connecting conductive bars 15 are supported by three step parts 19, and the connection positions of each connecting conductive bar 15 and the lead wire 12 are all located in the same gap to facilitate maintenance and installation.

[0047] It should be noted that in other embodiments, the number of step members 19 may also be other numbers, which is not limited in this embodiment.

[0048] Furthermore, the stator lead connection structure 10 may further include a connection box 18 , wherein the connection box 18 has a connection wall 181 , and an opening 182 is formed on the connection wall 181 , and the opening 182 corresponds to the stator lead pin 21 . The side of the step member 19 away from the connection step 191 is connected to the connection wall 181, and the second connection conductive part 152 extends toward the connection wall 181, and the lead wire 12 can be connected to the stator lead pin 21 by the connection wall 181. In other words, the stator lead pin 21 is opposite to the above-mentioned opening 182, and the first connection section 121 is connected to the stator lead pin 21 by the opening 182, extending into the connection box 18, and is divided into a second connection section 122 and a third connection section 123. The second connection section 122 and the third connection section 123 are respectively overlapped with the second connection conductive part 152 extending toward the opening 182. The lead wire 12 has fewer bends in the connection box 18, further improving the stability of the lead wire 12 connected to the second connection conductive part 152. During the inspection, a feeler gauge can also be used to detect whether the connection of each connection is qualified to ensure the reliability of the connection between the lead wire 12 and the connection conductive bar 15.

[0049] Furthermore, there is a gap between the projections of the multiple second connecting conductive parts 152 and the second connecting section 122 in the first direction, and the first direction is perpendicular to the first connecting conductive parts 151 and is located in the direction of the common plane of the multiple first connecting conductive parts 151. In this way, the roughly staggered connection positions are convenient for the operator to install and maintain, and the heat dissipation efficiency of the lead-out wire 12 is improved.

[0050] The working principle of the stator lead wire 12 connection structure provided in the embodiment of the present invention is:

[0051] The lead wire 12 includes a first connecting section 121, a second connecting section 122 and a third connecting section 123. One end of the first connecting section 121 is used to electrically connect to the stator lead pin 21, and the other end of the first connecting section 121 is simultaneously connected to the second connecting section 122 and the third connecting section 123. The second connecting section 122 and the third connecting section 123 are respectively overlapped on two corresponding side surfaces of the connecting conductive bar 15 to increase the contact area between the lead wire 12 and the connecting conductive bar 15, thereby ensuring good contact between the lead wire 12 and the connecting conductive bar 15.

[0052] Furthermore, the first connection section 121 is formed by stacking multiple conductive sheets, and the second connection section 122 and the third connection section 123 are formed by dividing the first connection section 121 into two strands, so as to be connected to the connection conductive bar 15 through the two separated strands, and the second connection section 122 and the third connection section 123 are both connected to the connection conductive bar 15 by sealing welding, so as to make the connection between the lead wire 12 and the connection conductive bar 15 more stable. Furthermore, the fixing bolt 171, the elastic washer 173, the fixing nut 172 and the holding sheet 174 of the fixing assembly 17 are used to connect the second connection section 122 and the third connection section 123 to the connection conductive bar 15 to increase the stability of the lead wire 12 connected to the connection conductive bar 15.

[0053] The stator lead connection structure 10 may further include a step member 19 having three connection steps 191, and three connection conductive bars 15 are connected to the three connection steps 191 one by one, so as to stagger the connection conductive bars 15, and the connection positions of the plurality of second connection conductive parts 152 and the second connection section 122 are spaced apart from each other in the projection in the first direction, so as to roughly stagger the connection positions, which is convenient for the operator to install and maintain, and improves the heat dissipation efficiency of the lead wire 12; further, the stator lead connection structure 10 may further include a connection box 18, and the second connection conductive part 152 extends toward the connection wall 181, so that when the lead wire 12 is connected to the second connection conductive part 152 by the connection wall 181, the lead wire 12 is less bent in the connection box 18, and the stability of the lead wire 12 connected to the second connection conductive part 152 is further improved. It is convenient for the operator to install and maintain, and improves the heat dissipation efficiency of the lead wire 12.

[0054] In summary:

[0055] The embodiment of the present invention provides a stator lead connection structure 10, which has the characteristic of good contact.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the features in the above embodiments can be combined with each other without conflict, and the present invention can also have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention. In addition, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. A stator lead connection structure (10), characterized in that: The invention comprises a lead wire (12) and a connecting conductive bar (15), wherein the lead wire (12) comprises a first connecting section (121), a second connecting section (122) and a third connecting section (123); one end of the first connecting section (121) is used to be electrically connected to a stator lead pin (21), and the other end is simultaneously connected to the second connecting section (122) and the third connecting section (123); the second connecting section (122) and the third connecting section (123) are respectively overlapped on two corresponding side surfaces of the connecting conductive bar (15); The second connecting section (122) and the third connecting section (123) are both formed by stacking a plurality of conductive sheets, and the first connecting section (121) is formed by extending and stacking the plurality of conductive sheets; the second connecting section (122) and the third connecting section (123) are both connected to the connecting conductive bar (15) by sealing welding; The stator lead connection structure (10) further comprises a step member (19), and one side of the step member (19) has a plurality of connection steps (191); The number of the connecting conductive bars (15) and the number of the lead wires (12) are both multiple, and the multiple connecting conductive bars (15) are connected one by one to the multiple connecting steps (191); The connecting conductive row (15) comprises a first connecting conductive portion (151) and a second connecting conductive portion (152), the first connecting conductive portion (151) and the second connecting conductive portion (152) are arranged at a right angle, and the first connecting conductive portion (151) is connected to the connecting step (191); The second connecting section (122) and the third connecting section (123) are respectively overlapped on two corresponding side surfaces of the second connecting conductive portion (152).

2. The stator lead connection structure (10) according to claim 1, characterized in that: The stator lead connection structure (10) further comprises a fixing assembly (17), wherein the fixing assembly (17) comprises a fixing bolt (171), a fixing nut (172) and a holding piece (174); The fixing bolt (171) is sequentially inserted into the second connecting section (122), the connecting conductive bar (15) and the third connecting section (123); the fixing nut (172) is connected to the fixing bolt (171) and clamps the second connecting section (122), the connecting conductive bar (15) and the third connecting section (123) together with the head of the fixing bolt (171); and the holding sheet (174) is located between the second connecting section (122) and the connecting conductive bar (15), or between the connecting conductive bar (15) and the third connecting section (123).

3. The stator lead connection structure (10) according to claim 1, characterized in that: The stator lead connection structure (10) comprises a plurality of step members (19), a gap is provided between two adjacent step members (19), and the second connection conductive parts (152) of each of the plurality of connection conductive bars (15) are located in the same gap.

4. The stator lead connection structure (10) according to claim 1, characterized in that: The stator lead connection structure (10) further comprises a connection box (18); a wall surface provided with an opening (182) in the connection box (18) is a connection wall surface (181); the connection wall surface (181) is used to correspond to the stator lead pin (21); a side of the step member (19) away from the connection step (191) is connected to the connection wall surface (181), and the second connection conductive portion (152) extends toward the connection wall surface (181); the lead wire (12) can be connected to the stator lead pin (21) via the connection wall surface (181).

5. The stator lead connection structure (10) according to claim 4, characterized in that: There is a gap between the projections of the connection points between each of the plurality of second connecting conductive parts (152) and the second connecting segment (122) in a first direction, wherein the first direction is a direction perpendicular to the first connecting conductive part (151) and located in a common plane of the plurality of first connecting conductive parts (151).

6. A wind turbine (100), characterized in that: It comprises a power generation body (20) and a stator lead connection structure (10) as claimed in any one of claims 1 to 5, wherein the power generation body (20) is provided with the stator lead pin (21), and one end of the first connection section (121) is electrically connected to the stator lead pin (21).

Images