A kind of high-power wind generator is with the fastener of conducting ring and lead-out wire

Abstract

The application discloses a kind of high-power wind-driven generator with electric ring and lead-out line fastening device, including machine base, the stator core coil is installed in the lower part of the machine base, and the upper part is provided with electric ring assembly, which is composed of sixteen electric rings and multiple terminals to form independent four sets of windings;Among them, the electric ring is fixed and supported by fixing and supporting assembly, the terminal is connected with the adapter copper bar, the adapter copper bar is fixed in the junction box and connected with the cable, and the cable is fixed on the fixed plate outside the machine base after leading out the junction box.The current load of the present mainstream two sets of windings is reduced by half compared with the application, and the current is balanced by multiple electric rings, the current density is reduced, the occurrence of fire is avoided, and the electric ring adopts three-layer layout for the first time, which reduces the space height of the generator, and a series of supporting, fixing, fastening structure and other means are used to ensure that the generator can run safely and reliably for a long time, and the power generation cost is reduced.

Description

Technical Field

[0001] This invention belongs to the field of wind turbine technology, specifically relating to a conductive ring and lead wire fastening device for a high-power wind turbine. Background Technology

[0002] As is well known, wind turbines convert wind energy into electrical energy, making them a clean and renewable energy source. Improving wind power efficiency primarily relies on larger wind turbines. This is because while larger turbines are more expensive to manufacture, they generate more electricity, significantly reducing the overall cost of wind power generation. Therefore, selecting turbines with larger single-unit capacities can greatly improve the utilization efficiency of wind energy resources, increasing annual power generation and revenue. Consequently, in recent years, with the rapid development of wind power technology in my country, the single-unit power of wind turbines has continuously increased from 1.5MW to 20MW.

[0003] However, with the increase in wind turbine power, the motor current continuously increases while the voltage level remains constant. If the original conductive ring and cable structure is continued, there is a risk of cable burnout, potentially causing a unit fire and resulting in significant losses. Therefore, to address the issue of cable overheating caused by the increased current of high-power motors, it is necessary to design multiple windings, more conductive rings, and more cables to reduce the current load and prevent fires. Currently, generators with a two-winding, eight-conductive-ring structure are the mainstream products. However, when the single-unit power exceeds 15MW, two windings are insufficient to solve the aforementioned problems. Structures with four windings and sixteen conductive rings, and those with more windings and conductive rings, lack mature designs and are prone to inaccurate positioning and difficulty in fixing the conductive ring leads. Furthermore, the increased number and weight of cables can lead to insecure connections and the risk of burnout at the joints.

[0004] In view of this, the inventors provide a conductive ring and lead wire fastening device for a high-power wind turbine generator to overcome the defects of the prior art. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a conductive ring and lead wire fastening device for high-power wind turbines. This addresses the problem that the increasing power of high-power generators leads to continuously increasing current and current load, causing cable overheating and potentially fires. It also solves the problems of inaccurate positioning and difficulty in fixing the conductive ring lead terminals when using multiple windings, and the increased weight of cables leading to insecure connections and easy burning at the connections. This device can be used in high-power wind turbines with a single unit power of 15–30 MW.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] A conductive ring and lead wire fastening device for a high-power wind turbine includes a cylindrical housing base. A stator core coil is installed inside the base. A conductive ring assembly is provided inside the base and above the stator core coil. The conductive ring assembly includes four independent windings. The four windings are mainly composed of sixteen conductive rings and multiple conductive ring terminals provided on the conductive rings. The conductive rings are used to evenly distribute the current generated by the stator core coil among the four windings, and the current is collected through the conductive rings and output through the conductive ring terminals.

[0008] The conductive ring assembly is fixed and supported by multiple sets of axial fixing components and several sets of radial support components. The free end of each conductive ring terminal is connected to one end of the adapter copper busbar. The other end of the adapter copper busbar is fixed in the junction box outside the base by a fixing member. The adapter copper busbar is connected to the power cable in the junction box by a bolt assembly. After the power cable is led out of the junction box, it is fixed by a cable fixing plate located outside the base.

[0009] Furthermore, the sixteen conductive rings corresponding to the four sets of windings in the conductive ring assembly are arranged in a three-layer layout along the axial direction of the frame, specifically from bottom to top as follows:

[0010] The first layer consists of four zero rings, labeled N1, N2, N3, and N4 from the inside out.

[0011] The second layer consists of the phase loops of the first and fourth sets of windings, which, from the inside out, are the U phase of the first set of windings, the V phase of the first set of windings, the W phase of the first set of windings, and the U phase of the fourth set of windings, the V phase of the fourth set of windings, and the W phase of the fourth set of windings.

[0012] The third layer consists of the phase loops of the second and third windings, which, from the inside out, are the U phase of the second winding, the V phase of the second winding, the W phase of the second winding, and the U phase of the third winding, the V phase of the third winding, and the W phase of the third winding.

[0013] Furthermore, all the conductive ring terminals are led out from the gap between the second and third layers.

[0014] Furthermore, each set of the fixing assembly includes a fixing block, a fixing screw, and a fixing nut washer that matches the fixing screw. The fixing nut washer is used to adjust the position of the fixing block on the fixing screw, and the fixing screw is fixed to the stator core.

[0015] There are two fixing blocks, which are respectively set at the bottom of the third layer and between the second and first layers, and locked by fixing nuts and washers. They are used to adjust the axial height between layers and the isolation gap between conductive rings in the same layer.

[0016] Furthermore, the fixing block is made of insulating material.

[0017] Furthermore, the gap between the third winding U phase and the third winding V phase is equal to the gap between the fourth winding U phase and the fourth winding V phase, and is greater than the gap between other conductive rings in the same layer.

[0018] Furthermore, each set of the support assembly includes a support plate, a support screw, and a support nut washer. The support plate is closely attached to the outside of the three conductive rings. One end of the support screw is connected to the support plate, and the other end is connected to the inner wall of the base. The three conductive rings are radially tightened and adjusted by the support nut washer screwed to the support screw.

[0019] Furthermore, the power cable is secured with a waterproof metal gland when it exits the junction box.

[0020] Furthermore, the cable fixing plate is provided with multiple through holes at intervals for power cables to pass through, and the cable fixing plate is fixedly connected to the base by double-ended screws.

[0021] Furthermore, the device is used in wind turbines with a single unit power of 15 to 30 MW.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. This invention provides a conductive ring and lead wire fastening device for a high-power wind turbine generator. This device adopts a four-winding structure, which reduces the current load by half compared to the current mainstream two-winding structure. This solves the problem of generator fire caused by cable overheating due to increased current load. The four windings of this device are evenly and alternately distributed around the entire circle, and the four windings are independent of each other, enabling individual operation and meeting 1 / 4 power, 1 / 2 power, 3 / 4 power and full power operation. In addition, the conductive rings corresponding to the four windings adopt a three-layer layout for the first time, which effectively reduces the generator's height. Furthermore, all conductive ring terminals are led out from between the second and third layers, effectively reducing the coil leads. Overall, this reduces the cost of the generator and improves the reliability of generator operation.

[0024] 2. The present invention provides a conductive ring and lead wire fastening device for a high-power wind turbine generator. The device adds fixed support components to the axial and radial directions of the conductive ring to bear the weight of the conductive ring, ensuring the reliability of the conductive ring structure and avoiding the failure of burning at the joint due to excessive force on the small joint caused by the excessive weight of the conductive ring.

[0025] 3. The present invention provides a conductive ring and lead wire fastening device for a high-power wind turbine generator. The device sets a transition copper busbar between the conductive ring and the cable connection to reliably output the current. The transition copper busbar is fixed in the junction box using a safety fastening device to reduce the risk of unreliable current transmission caused by hard connection. At the same time, after the cable is connected to the transition copper busbar, it is led out from the junction box. The junction box uses a gland to fix the cable, and a cable fixing device is set on the base to clamp the cable and route it according to the set path, thereby improving the reliability of the cable connection. Attached Figure Description

[0026] The accompanying drawings are incorporated in and form part of this specification, and together with the description serve to explain the principles of the invention.

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the overall structure of the conductive ring and lead wire fastening device of the present invention;

[0029] Figure 2 This is a top view of the conductive ring and lead wire fastening device of the present invention;

[0030] Figure 3 This is a three-layer layout diagram of the conductive ring of the present invention;

[0031] Figure 4 yes Figure 2 AA section view in the middle;

[0032] Figure 5 yes Figure 2 BB section view in the middle;

[0033] Figure 6 yes Figure 5 Enlarged view of section C within the dashed box;

[0034] Figure 7 yes Figure 1 A magnified view of the area after the top cover was removed.

[0035] Wherein: 1 is the stator core coil; 2 is the conductive ring assembly; 3 is the fixing assembly; 4 is the support assembly; 5 is the adapter copper busbar; 6 is the junction box; 7 is the fixing component; 8 is the power cable; 9 is the cable fixing plate; 10 is the frame;

[0036] 2.1 is the first winding; 2.1.1 is the U phase of the first winding; 2.1.2 is the V phase of the first winding; 2.1.3 is the W phase of the first winding;

[0037] 2.2 is the second winding; 2.2.1 is the U phase of the second winding; 2.2.2 is the V phase of the second winding; 2.2.3 is the W phase of the second winding;

[0038] 2.3 is the third winding; 2.3.1 is the U phase of the third winding; 2.3.2 is the V phase of the third winding; 2.3.3 is the W phase of the third winding;

[0039] 2.4 is the fourth winding; 2.4.1 is the U phase of the fourth winding; 2.4.2 is the V phase of the fourth winding; 2.4.3 is the W phase of the fourth winding;

[0040] 2.5 is a conductive ring terminal.

[0041] 3.1 is the fixing block; 3.2 is the fixing screw; 3.3 is the fixing nut washer;

[0042] 4.1 is the support plate; 3.2 is the support screw; 3.3 is the support nut washer;

[0043] 5.1 refers to bolted assemblies;

[0044] 6.1 is a metal waterproof grille

[0045] 9.1 is a double-ended screw. Detailed Implementation

[0046] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses consistent with some aspects of the invention as detailed in the appended claims.

[0047] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0048] See Figures 1-7As shown, this invention provides a conductive ring and lead wire fastening device for a high-power wind turbine generator, including a cylindrical housing base 10. A stator core coil 1 is installed inside the base 10. The stator core coil assembly 1 consists of a stator core and a coil, which induces a current in the cutting magnetic field generated by the rotation of a permanent magnet, thus realizing the conversion of electrical energy. A conductive ring assembly 2 is provided inside the base 10, above the stator core coil 1. The conductive ring assembly 2 includes four independent windings, namely a first winding 2.1, a second winding 2... 2. The third winding 2.3 and the fourth winding 2.4 are mainly composed of sixteen conductive rings and multiple conductive ring terminals 2.5 on the conductive rings. This device distributes the current generated by the stator core coil 1 evenly among the four windings, and outputs the current through the conductive ring terminals 2.5 after the current is collected through the conductive rings. Compared with the mainstream two-winding system on the market, the current load is reduced by half. Moreover, the current density is reduced by the current sharing through the sixteen conductive rings, thus solving the problem of fire caused by excessive current load.

[0049] Because this device uses sixteen conductive rings, the total weight of the conductive rings is significantly increased compared to the current mainstream eight. Therefore, this invention uses multiple sets of fixing components 3 in the axial direction and several sets of supporting components 4 in the radial direction to fix and support the conductive rings, thereby improving the reliability of current transmission. In addition, the free end of each conductive ring terminal 2.5 in this device is connected to one end of the adapter copper busbar 5. The other end of the adapter copper busbar 5 is fixed in the junction box 6 outside the base 10 by the fixing member 7. The adapter copper busbar 5 is connected to the power cable 8 in the junction box 6 by the bolt assembly 5.1. After the power cable 8 is led out of the junction box 6, it is fixed by the cable fixing plate 9 located outside the base 10. Preferably, since the power cable 8 is relatively heavy, it is clamped and fixed with a metal waterproof gland 6.1 when it exits the junction box 6 to protect it from scratches. At the same time, the cable fixing plate 9 has multiple through holes at intervals for the power cable 8 to pass through. The cable fixing plate 9 is fixedly connected to the outer wall of the base 10 by double-headed screws 9.1. That is, the power cable 8 is fixed in a secondary way by the cable fixing plate 9, which can arrange the cable reasonably and avoid the generation of eddy currents or even fires caused by the overlapping of messy cables.

[0050] Specifically, such as Figures 3-6As shown, the sixteen conductive rings corresponding to the four sets of windings in the conductive ring assembly 2 of the present invention are arranged in a three-layer layout along the axial direction of the base 1. Specifically, from bottom to top, they are as follows: the first layer consists of four zero rings, which are marked as N1, N2, N3, and N4 from the inside out; the second layer consists of the phase rings of the first set of windings 2.1 and the fourth set of windings 2.4, which are, from the inside out, the U phase 2.1.1, V phase 2.1.2, and W phase 2.1 of the first set of windings. 3 and the fourth set of windings U phase 2.4.1, V phase 2.4.2, and W phase 2.4.3; the third layer consists of the phase loops of the second set of windings 2.2 and the third set of windings 2.3, which, from the inside out, are the second set of windings U phase 2.2.1, V phase 2.2.2, W phase 2.2.3, U phase 2.3.1, V phase 2.3.2, and W phase 2.3.3. The conductive rings corresponding to the four sets of windings in this invention adopt a three-layer layout for the first time, which effectively reduces the height of the generator space and reduces manufacturing costs. The four sets of windings are evenly and alternately distributed around the entire circle, and the four sets of windings are independent of each other, enabling individual operation and meeting the requirements of 1 / 4 power, 1 / 2 power, 3 / 4 power and full power operation. It is also worth noting that the second and third layers of conductive rings have the same structure, which is simple. All conductive ring terminals 2.5 are led out from the gap between the second and third layers, which effectively reduces the number of coil leads and further reduces manufacturing costs.

[0051] like Figure 3 , 5 As shown in Figure 6, each fixing assembly 3 of the present invention includes a fixing block 3.1, a fixing screw 3.2, and a fixing nut washer 3.3 that matches the fixing screw 3.2. The fixing nut washer 3.3 is used to adjust the position of the fixing block 3.1 (the fixing block 3.1 has a through hole that can move freely along the fixing screw 3.2) on the fixing screw 3.2. The fixing screw 3.2 is fixed on the stator core and plays a safe fastening role. In actual production, the fixing block 3.1 is made of insulating material, such as rubber, so it can directly contact the conductive ring. There are two of them, which are respectively set at the bottom of the third layer and between the second layer and the first layer, and locked by the fixing nut washer 3.3. It is used to adjust the axial height between layers and to achieve isolation between conductive rings in the same layer (when isolating conductive rings, multiple grooves or protrusions with spacing can be set on the fixing block 3.1), so as to avoid the problem of dimensional deviation and installation difficulties caused by insufficient process.

[0052] In this invention, since all conductive ring terminals 2.5 are led out from the gap between the second and third layers, and sufficient clearance is required for the hoisting fixtures used in assembling the stator core coil 1, the invention incorporates a protrusion on the top of the strip-shaped fixing block 3.1 to ensure adequate spacing between the conductive rings. Specifically, the gap between the third winding U phase 2.3.1 and the third winding V phase 2.3.2 is equal to the gap between the fourth winding U phase 2.4.1 and the fourth winding V phase 2.4.2, and greater than the gaps between other conductive rings in the same layer. This non-uniform spacing between the conductive rings achieves the spatial requirements for hoisting and assembling the stator core coil 1.

[0053] The weight of the sixteen conductive rings in this invention is mainly borne by the coil leads and the axial fixing component 3. To further distribute the weight of the conductive rings and ensure the reliability of current transmission, this device provides a [feature] between the outer side of the three conductive rings and the inner wall of the base 10. Figure 4 , 7 The radial support assembly 4 shown includes a support plate 4.1, support screws 4.2, and support nut washers 4.3. The support plate 4.1 is closely attached to the outer surface of the three-layer conductive ring. One end of each of the multiple support screws 4.2 is connected to the support plate 4.1, and the other end is connected to the inner wall of the base 10. The three-layer conductive ring is radially tightened and adjusted by the support nut washers 4.3 screwed to the support screws 4.2.

[0054] In summary, the device of this invention, through the above-mentioned design, firstly solves the problem that the increasing power of high-power generators leads to a continuous increase in current and current load, causing cable overheating and potentially resulting in generator fires; secondly, it solves the problems of inaccurate positioning and fixing of conductive ring leads after using multiple sets of windings, and the increased weight of cables due to the increased number of cables, leading to insecure connections and the risk of burnt-out connections. The device of this invention reduces the current load through four independent sets of windings and reduces current density by distributing current through sixteen conductive rings, thus preventing fires. Furthermore, the conductive rings are arranged in a three-layer layout for the first time, reducing the generator's height. Simultaneously, the combined design of the conductive ring fixing and support structure, the connecting copper busbar fixing structure, and the cable fastening structure ensures the long-term safe and reliable operation of the generator, enabling its use in high-power wind turbines of 15-30MW power ratings, thereby further reducing power generation costs.

[0055] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention.

[0056] It should be understood that the present invention is not limited to the content already described above, and various modifications and changes can be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. A conductive ring and lead wire fastening device for a high-power wind turbine generator, characterized in that, The system includes a cylindrical housing base (10), in which a stator core coil (1) is installed. A conductive ring assembly (2) is provided in the base (10) above the stator core coil (1). The conductive ring assembly (2) includes four independent windings. The four windings consist of sixteen conductive rings and multiple conductive ring terminals (2.5) provided on the conductive rings. The conductive rings are used to distribute the current generated by the stator core coil (1) equally among the four windings. The current is collected through the conductive rings and then output through the conductive ring terminals (2.5). The conductive ring assembly (2) is fixed and supported by multiple sets of axial fixing assemblies (3) and several sets of radial support assemblies (4). The free end of each conductive ring terminal (2.5) is connected to one end of the adapter copper busbar (5). The other end of the adapter copper busbar (5) is fixed in the junction box (6) outside the base (10) by a fixing member (7). The adapter copper busbar (5) is connected to the power cable (8) in the junction box (6) by a bolt assembly (5.1). After the power cable (8) is led out of the junction box (6), it is fixed by a cable fixing plate (9) located outside the base (10). The sixteen conductive rings corresponding to the four sets of windings in the conductive ring assembly (2) are arranged in a three-layer layout along the axial direction of the base (1), specifically from bottom to top as follows: The first layer consists of four zero rings, labeled N1, N2, N3, and N4 from the inside out. The second layer consists of the phase loops of the first winding (2.1) and the fourth winding (2.4), which, from the inside out, are the first winding U phase (2.1.1), the first winding V phase (2.1.2), the first winding W phase (2.1.3), and the fourth winding U phase (2.4.1), the fourth winding V phase (2.4.2), and the fourth winding W phase (2.4.3). The third layer consists of the phase loops of the second winding (2.2) and the third winding (2.3), which, from the inside out, are the second winding U phase (2.2.1), the second winding V phase (2.2.2), the second winding W phase (2.2.3), and the third winding U phase (2.3.1), the third winding V phase (2.3.2), and the third winding W phase (2.3.3).

2. The conductive ring and lead wire fastening device for a high-power wind turbine generator according to claim 1, characterized in that, All the conductive ring terminals (2.5) are led out from the gap between the second and third layers.

3. The conductive ring and lead wire fastening device for a high-power wind turbine generator according to claim 1, characterized in that, Each set of the fixing assembly (3) includes a fixing block (3.1), a fixing screw (3.2), and a fixing nut washer (3.3) that matches the fixing screw (3.2). The fixing nut washer (3.3) is used to adjust the position of the fixing block (3.1) on the fixing screw (3.2), which is fixed to the stator core. Among them, there are two fixing blocks (3.1), which are respectively set at the bottom of the third layer and between the second layer and the first layer, and are locked by fixing nut washers (3.3) to adjust the axial height between layers and the isolation gap between conductive rings in the same layer.

4. The conductive ring and lead wire fastening device for a high-power wind turbine generator according to claim 3, characterized in that, The fixing block (3.1) is made of insulating material.

5. The conductive ring and lead wire fastening device for a high-power wind turbine generator according to claim 3, characterized in that, The gap between the third winding U phase (2.3.1) and the third winding V phase (2.3.2) is equal to the gap between the fourth winding U phase (2.4.1) and the fourth winding V phase (2.4.2), and is greater than the gap between other conductive rings in the same layer.

6. The conductive ring and lead wire fastening device for a high-power wind turbine generator according to claim 1, characterized in that, Each set of the support assembly (4) includes a support plate (4.1), a support screw (4.2), and a support nut washer (4.3). The support plate (4.1) is closely attached to the outside of the three-layer conductive ring. One end of the support screw (4.2) is connected to the support plate (4.1), and the other end is connected to the inner wall of the base (10). The three-layer conductive ring is radially tightened and adjusted by the support nut washer (4.3) screwed to the support screw (4.2).

7. The conductive ring and lead wire fastening device for a high-power wind turbine generator according to claim 1, characterized in that, When the power cable (8) is led out of the junction box (6), it is secured with a metal waterproof gland (6.1).

8. The conductive ring and lead wire fastening device for a high-power wind turbine generator according to claim 1, characterized in that, The cable fixing plate (9) has multiple through holes spaced apart for the power cable (8) to pass through, and the cable fixing plate (9) is fixedly connected to the base (10) by a double-headed screw (9.1).

9. A conductive ring and lead wire fastening device for a high-power wind turbine generator according to any one of claims 1 to 8, characterized in that, The device is used in wind turbines with a single unit power of 15 to 30 MW.

Images