A multi-winding motor conductive ring structure, stator and its wind turbine generator
By combining a full circular ring with a minor arc ring and using redundant design, the conductive ring problem of multi-winding wind turbines was solved, enabling low-cost, high-reliability operation of high-power wind turbines.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CRRC XIAN YONGE JIELI WIND ENERGY CO LTD
- Filing Date
- 2022-08-18
- Publication Date
- 2026-05-26
AI Technical Summary
In the existing technology, the conductive ring structure of multi-winding wind turbines has problems such as large number of rings used, large axial height, high cost, high manufacturing difficulty, large vibration and noise, and uneven redundancy design, which cannot meet the needs of high-power wind turbines.
The arrangement combines full-circle rings and minor-arc rings, with multiple conductive rings concentrated in a single concentric circle layer, reducing the number of full-circle conductive rings used. The multiple sets of windings are divided into two independent groups, which are connected to the converter respectively, to achieve redundancy design.
The axial height and weight of the conductive ring were reduced, production costs were lowered, manufacturing difficulty was reduced, insulation failure was avoided, the motor was ensured to be subjected to uniform force, vibration and noise were reduced, reliability and stability were improved, and the requirements of high-power wind turbines were met.
Smart Images
Figure CN115333276B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of wind turbine technology, specifically relating to a multi-winding motor conductive ring structure, stator, and wind turbine generator thereof. Background Technology
[0002] As we all know, wind turbines convert wind energy into electricity, a clean and renewable energy source that plays an increasingly important role in the national strategy of "carbon peaking and carbon neutrality." In recent years, with the rapid development of wind power generation technology, the single-unit power of wind turbines has continued to increase, especially for offshore wind turbines, where the single-unit power is about to exceed 20MW. The common double-winding system can no longer meet the increased power requirements. Multi-winding wind turbines with four or more windings can effectively solve the technical difficulties and manufacturing bottlenecks brought about by ultra-high power motors, such as large current, complex control systems, and high costs.
[0003] However, there are currently few generator conductor ring structures with four or more windings. For example, Chinese patent CN206211689U discloses a generator stator and wind turbine generator. Although it can realize the independent operation of four windings located in the four quadrants, the windings are not evenly distributed around the circumference, resulting in uneven force on the motor during operation, which leads to motor vibration and noise, and thus affects the service life of the unit.
[0004] Secondly, as motor power increases and engine compartment space decreases, the space available for generators within the engine compartment becomes increasingly limited. This necessitates a more compact generator structure. For example, Chinese patent CN108155738B discloses an end-ring structure unit, an end ring, and a generator. The conductive rings are changed from a single loop arrangement to a two-loop arrangement. Although the axial height is reduced (avoiding multiple layers of axial stacking) and significantly reducing the axial space occupied by the generator, the number of conductive rings used is larger, resulting in a large amount of copper material and higher costs. Furthermore, with the two-loop arrangement, the lead wires of the outer conductive rings need to pass through the inner conductive rings via welded irregular terminals, which is inconvenient and poses a risk of short circuits due to insulation damage.
[0005] In addition, due to the harsh marine environment, the unit is required to have high reliability and safety, as well as a certain degree of redundancy design to reduce operation and maintenance costs. This requires multiple sets of windings to be able to work independently. If one set fails, the remaining windings can still continue to work. When the marine environment permits, maintenance personnel can be dispatched to repair the fault, so that the entire machine does not stop operating, thereby reducing losses.
[0006] In summary, the existing technology has the following drawbacks: 1) The motor uses a large number of conductive rings and has a large axial height dimension, which requires an increase in the length of the motor base, resulting in a large weight and high cost of the motor unit; 2) The conductive ring lead wire structure is irregular, which makes manufacturing difficult and poses a risk of short circuit.
[0007] 3) The redundant design of multiple winding motors with single-set independent operation and uneven distribution of windings leads to problems such as large vibration and noise of the whole machine.
[0008] In view of this, the inventors propose a multi-winding motor conductive ring structure, stator and its wind turbine generator to solve the problems existing in the prior art. Summary of the Invention
[0009] The purpose of this invention is to overcome the shortcomings of the prior art and provide a multi-winding motor conductive ring structure, stator, and wind turbine generator. This motor conductive ring structure adopts a combination of full-circle rings and minor-arc rings, with multiple conductive rings concentrated in a single concentric circle. This reduces the number of conductive rings used in a single loop, lowers the axial height of the conductive rings, and thus reduces the overall axial height of the generator, lightening the weight of the unit and reducing production costs. Furthermore, the conductive ring structure arranged in the same layer can be directly connected to the junction box. In addition, this invention divides the multiple windings into two independent groups. When one group fails, the converter on the corresponding side of that group stops working, while the other group continues to operate normally. Since the remaining windings are evenly distributed throughout the motor circumference, the motor experiences uniform stress, reducing motor vibration and noise while ensuring long-term stable operation, thereby significantly reducing economic losses caused by unit downtime.
[0010] The objective of this invention is achieved through the following technical solution:
[0011] A motor conductive ring structure with multiple windings, the conductive ring structure includes a U-phase conductive ring group, a V-phase conductive ring group and a W-phase conductive ring group, wherein the U-phase conductive ring group, the V-phase conductive ring group and the W-phase conductive ring group are arranged in a ring with a spacing from the outside to the inside, and are located on the same horizontal plane;
[0012] Each of the U-phase conductive ring group, V-phase conductive ring group, and W-phase conductive ring group has the same structural layout. Each phase conductive ring group consists of 2N winding full circular rings and 2N winding minor arc rings. The virtual circle spacing formed by every two winding minor arc rings is set between two winding full circular rings. At the same time, multiple winding full circular rings and multiple winding minor arc rings are located on a concentric circle to form 4N sets of windings. The 4N sets of windings are divided into 2N groups, and each group is connected to an external converter separately.
[0013] Where all N are integers greater than or equal to 1.
[0014] Furthermore, the conductive ring structure includes four sets of windings, which are respectively labeled as the first set of windings, the second set of windings, the third set of windings, and the fourth set of windings. The first set of windings and the second set of windings form one group, and the third set of windings and the fourth set of windings form another group.
[0015] Furthermore, the conductive ring structure divides the body into two halves by connecting the 6-point and 12-point lines, and these halves are marked as the first semicircle and the second semicircle. The two minor arc rings in each phase conductive ring group are located in the first semicircle and the second semicircle, respectively.
[0016] The second and fourth windings are located within the first semicircle, the first and third windings are located within the second semicircle, and the first and second windings are respectively connected to an external first converter, while the third and fourth windings are respectively connected to an external second converter.
[0017] Furthermore, the U-phase conductive ring group is composed of a first set of winding 1U ring, a second set of winding 2U ring, a third set of winding 3U ring and a fourth set of winding 4U ring. The first set of winding 1U ring and the fourth set of winding 4U ring are full circular rings, the second set of winding 2U ring and the third set of winding 3U ring are minor arc rings, and the circle formed by the second set of winding 2U ring and the third set of winding 3U ring is virtually equidistantly arranged between the first set of winding 1U ring and the fourth set of winding 4U ring.
[0018] The V-phase conductive ring group consists of a first set of winding 1V ring, a second set of winding 2V ring, a third set of winding 3V ring, and a fourth set of winding 4V ring. The first set of winding 1V ring and the fourth set of winding 4V ring are full circular rings, and the second set of winding 2V ring and the third set of winding 3V ring are minor arc rings. The circle formed by the second set of winding 2V ring and the third set of winding 3V ring is virtually equidistant between the first set of winding 1V ring and the fourth set of winding 4V ring.
[0019] The W-phase conductive ring group consists of a first set of windings 1W ring, a second set of windings 2W ring, a third set of windings 3W ring, and a fourth set of windings 4W ring. The first set of windings 1W ring and the fourth set of windings 4W ring are full circular rings, while the second set of windings 2W ring and the third set of windings 3W ring are minor arc rings. The circle formed by the second set of windings 2W ring and the third set of windings 3W ring is virtually equidistant between the first set of windings 1W ring and the fourth set of windings 4W ring.
[0020] Furthermore, each of the first winding, the second winding, the third winding, and the fourth winding is provided with a junction box.
[0021] The first winding junction box and the second winding junction box corresponding to the first winding are respectively connected to the first converter via cables; the third winding junction box and the fourth winding junction box corresponding to the third winding are respectively connected to the second converter via cables.
[0022] Furthermore, the coils corresponding to the first set of windings are evenly arranged in the second semicircle, and the U-phase, V-phase and W-phase currents of the first set of windings are introduced into the first set of winding cable junction box through the corresponding first set of winding 1U ring, first set of winding 1V ring and first set of winding 1W respectively.
[0023] The coils corresponding to the second set of windings are evenly arranged in the first semicircle. The U-phase, V-phase and W-phase currents of the second set of windings are introduced into the cable junction box of the second set of windings through the corresponding second set of windings 2U ring, second set of windings 2V ring and second set of windings 2W ring respectively.
[0024] The coils corresponding to the third winding are evenly arranged in the second semicircle. The U-phase, V-phase and W-phase currents of the third winding are introduced into the cable junction box of the third winding through the corresponding 3U ring, 3V ring and 3W ring of the third winding, respectively.
[0025] The coils corresponding to the fourth winding are evenly arranged in the first semicircle. The U-phase, V-phase and W-phase currents of the fourth winding are introduced into the fourth winding cable junction box through the corresponding fourth winding 4U ring, fourth winding 4V ring and fourth winding 4W ring, respectively.
[0026] Furthermore, the junction boxes corresponding to the first set of windings 1U-1V-1W and the second set of windings 2U-2V-2W are symmetrically arranged with respect to the connection lines at the 6 o'clock and 12 o'clock positions with respect to the junction boxes corresponding to the third set of windings 3U-3V-3W and the fourth set of windings 4U-4V-4W.
[0027] Furthermore, in each of the U-phase conductive ring group, V-phase conductive ring group and W-phase conductive ring group, a number of evenly distributed insulating blocks are installed between the full circular ring of the winding and the minor arc ring of the winding.
[0028] In addition, the present invention also provides a generator stator composed of a multi-set winding motor conductive ring structure. The generator stator includes a stator core and stator coils. The stator coils are evenly distributed in the stator core. The conductive ring structure is fixed to the stator core by conductive ring support rods. The U-phase conductive ring group, V-phase conductive ring group and W-phase conductive ring group of the conductive ring structure are all welded with lead-out terminals. The lead-out terminals are electrically connected to the cable in the junction box.
[0029] Finally, the present invention also provides a wind turbine generator based on the generator stator composed of the above-mentioned multi-set winding motor conductive ring structure. The wind turbine generator is connected to the converter through the conductive ring structure on the generator stator. When the generator is running, the current generated by the stator coil is collected through the conductive ring structure and then fed into the converter through the lead-out terminal by the cable, thereby realizing power generation.
[0030] Compared with the prior art, the present invention has the following beneficial effects:
[0031] 1. The conductive ring structure of the motor of the present invention adopts a combination of full circular winding rings and minor arc winding rings, which greatly reduces the use of full circular winding rings. Taking four sets of windings as an example, the conductive rings are changed from 12 (4 sets of UVW) full circular winding rings in the prior art to 6 full circular winding rings + 6 minor arc winding rings, reducing the conductive ring material by more than 25%. At the same time, the conductive rings of the present invention are concentrated in one layer of concentric circles, which reduces the axial height of the conductive ring structure, thereby reducing the axial height of the entire generator, reducing the weight of the unit, and reducing production costs.
[0032] 2. The conductive ring structure arranged on the same layer allows the conductive ring lead wires to be directly introduced into the junction box, avoiding the need for the lead wires of the lower conductive rings to pass through the upper conductive rings in the design of multi-layer conductive rings, which would result in the lead wire terminals having an irregular structure. This invention can reduce the difficulty of lead wire manufacturing, avoid short circuit faults in the generator caused by insulation failure, and ensure the long-term stable operation of the generator.
[0033] 3. This invention divides multiple sets of windings (4N windings) into two groups, evenly distributed within slots in a semi-circular region of the stator core. Under normal power operation, all windings operate, resulting in symmetrical and uniform force on the motor circumference. When one set of windings fails, the converter connected to that group stops working, while the other set of converters continues to operate normally. Because the remaining windings are evenly distributed across the entire motor circumference, the motor experiences uniform force, reducing vibration and noise while ensuring long-term stable operation. In other words, this invention achieves redundant design, improves motor reliability, and significantly reduces economic losses caused by turbine downtime, especially considering the short operating window for offshore wind power.
[0034] 4. The conductive ring structure with multiple windings of this invention can adapt to a single wind turbine power of 20MW or even higher, maximizing the capacity of offshore wind turbine units, improving resource development and utilization, and maximizing profits. Attached Figure Description
[0035] 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.
[0036] 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, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0037] Figure 1 This is a schematic diagram of the motor conductive ring structure with multiple windings according to the present invention;
[0038] Figure 2 yes Figure 1 Enlarged view of the structure at point A in the middle;
[0039] Figure 3 yes Figure 1 Enlarged view of the structure at point B in the middle;
[0040] Figure 4 This is a schematic diagram of the generator stator structure of the multi-winding motor conductive ring structure of the present invention;
[0041] Figure 5 This is a schematic diagram of the principle structure of a wind turbine generator that utilizes a multi-winding motor conductive ring structure according to the present invention.
[0042] In the diagram: 1 is the stator core; 2 is the stator coil; 3 is the conductor ring support rod; 4 is the conductor ring structure; 5 is the lead-out terminal; 6 is the cable; 7 is the converter; 4-1 is the U-phase conductor ring group; 4-2 is the V-phase conductor ring group; 4-3 is the W-phase conductor ring group; 7-1 is the first converter; 7-2 is the second converter; 1U-1V-1W is the first winding; 2U-2V-2W is the second winding; 3U-3V-3W is the third winding; 4U-4V-4W is the fourth winding; 4-1-1 is the... The first set of windings consists of 1U rings; 4-1-2 is the second set of windings consisting of 2U rings; 4-1-3 is the third set of windings consisting of 3U rings; 4-1-4 is the fourth set of windings consisting of 4U rings; 4-2-1 is the first set of windings consisting of 1V rings; 4-2-2 is the second set of windings consisting of 2V rings; 4-2-3 is the third set of windings consisting of 3V rings; 4-2-4 is the fourth set of windings consisting of 4V rings; 4-2-1 is the first set of windings consisting of 1V rings; 4-2-2 is the second set of windings consisting of 2V rings; 4-2-3 is the third set of windings consisting of 3V rings; 4-2-4 is the fourth set of windings consisting of 4V rings. Detailed Implementation
[0043] 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 numbers 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.
[0044] 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.
[0045] Please see Figures 1-5 As shown, this invention provides a multi-set winding motor conductive ring structure. This motor conductive ring structure 4 includes a U-phase conductive ring group 4-1, a V-phase conductive ring group 4-2, and a W-phase conductive ring group 4-3. The U-phase conductive ring group 4-1, V-phase conductive ring group 4-2, and W-phase conductive ring group 4-3 are arranged in a ring-shaped arrangement with a spacing between them, and are located on the same horizontal plane. The structural layout of each U-phase conductive ring group 4-1, V-phase conductive ring group 4-2, and W-phase conductive ring group 4-3 is identical, that is, each phase conductive ring group consists of 2N (N is an integer greater than or equal to 1) windings. The circuit consists of (number, hereinafter the same) complete circular windings and 2N minor arc windings, with the virtual circle spacing formed by every two minor arc windings positioned between the two complete circular windings. All of the complete circular windings and the minor arc windings are located on a concentric circle, forming 4N sets of windings. These 4N sets of windings are divided into two groups, each individually connected to an external converter 7. Through this configuration, the conductive ring of this invention has the following three advantages: First, by adopting a layout of complete circular windings + minor arc windings, the number of windings in the same number of sets is significantly reduced. First, the use of fully circular windings allows the conductive rings to be concentrated in a single concentric circle, reducing the axial height of the conductive rings. Therefore, the generator frame does not need to be lengthened, thus reducing the overall axial height of the generator, lightening the unit's weight, and lowering production costs. Second, the conductive ring structure uses fully circular windings and short-arc windings arranged in the same layer. This allows for direct wiring in the conductive ring lead design, eliminating irregular structures and facilitating manufacturing. It also avoids generator short-circuit faults caused by easily failing irregular insulation. Third, multiple windings are divided into two groups, each independently connected to a converter, effectively in parallel. Under normal power operation, all windings operate, resulting in symmetrical and uniform force on the generator circumference. When one group fails, the corresponding converter stops working, while the other converter continues operating normally, and the remaining windings remain operational, meaning the generator operates at half power. Since the remaining windings are evenly distributed across the entire generator circumference, the motor experiences uniform force, reducing vibration and noise while ensuring long-term stable operation.
[0046] To verify the effectiveness of the present invention, this embodiment is specifically described below using a four-set winding conductive ring structure:
[0047] like Figure 1 , 4As shown, the motor conductive ring structure 4 contains four sets of windings, labeled as the first set of windings 1U-1V-1W, the second set of windings 2U-2V-2W, the third set of windings 3U-3V-3W, and the fourth set of windings 4U-4V-4W. The motor conductive ring structure 4 is divided into two halves by connecting the 6 o'clock and 12 o'clock points, which are the first semicircle on the left and the second semicircle on the right in the figure. The second set of windings 2U-2V-2W and the fourth set of windings 4U-4V-4W are located in the first semicircle, and the first set of windings 1U-1V-1W and the third set of windings 3U-3V-3W are located in the second semicircle. The first set of windings 1U-1V-1W and the second set of windings 2U-2V-2W are respectively connected to the external first converter 7-1, and the third set of windings 3U-3V-3W and the fourth set of windings 4U-4V-4W are respectively connected to the external second converter 7-2 to achieve redundancy design.
[0048] Specifically, such as Figures 1-3As shown, the U-phase conductive ring group 4-1 consists of a first set of windings 1U-ring 4-1-1, a second set of windings 2U-ring 4-1-2, a third set of windings 3U-ring 4-1-3, and a fourth set of windings 4U-ring 4-1-4. The first set of windings 1U-ring 4-1-1 and the fourth set of windings 4U-ring 4-1-4 are complete circular rings, while the second set of windings 2U-ring 4-1-2 and the third set of windings 3U-ring 4-1-3 are minor arc rings. Furthermore, the second set of windings 2U-ring 4-1-2 and the fourth set of windings 4U-ring 4-1-4 are connected in series. The three sets of windings 3U rings 4-1-3 are arranged in a virtual, equidistant circle between the first set of windings 1U rings 4-1-1 and the fourth set of windings 4U rings 4-1-4; the V-phase conductive ring group 4-2 is composed of the first set of windings 1V rings 4-2-1, the second set of windings 2V rings 4-2-2, the third set of windings 3V rings 4-2-3, and the fourth set of windings 4V rings 4-2-4, with the first set of windings 1V rings 4-2-1 and the fourth set of windings 4V rings 4-2-4 being complete circular rings. The second set of windings, 2V ring 4-2-2 and the third set of windings, 3V ring 4-2-3, are minor arc rings. The circle formed by the second set of windings, 2V ring 4-2-2 and the third set of windings, 3V ring 4-2-3, is virtually equidistantly positioned between the first set of windings, 1V ring 4-2-1 and the fourth set of windings, 4V ring 4-2-4. The W-phase conductive ring group 4-3 consists of the first set of windings, 1W ring 4-3-1, the second set of windings, 2W ring 4-3-2, and the third set of windings, 3W ring 4-3-3. It consists of a fourth set of windings, 4W rings 4-3-4. The first set of windings, 1W rings 4-3-1 and the fourth set of windings, 4W rings 4-3-4 are complete circular rings. The second set of windings, 2W rings 4-3-2 and the third set of windings, 3W rings 4-3-3 are minor arc rings. The circle formed by the second set of windings, 2W rings 4-3-2 and the third set of windings, 3W rings 4-3-3 is virtually equidistantly positioned between the first set of windings, 1W rings 4-3-1 and the fourth set of windings, 4W rings 4-3-4. The conductive ring structure of this invention adopts a combination of full circular rings and minor arc rings. The number of conductive rings in the four sets of winding motors has been reduced from the original 12 (4 sets of UVW) full circular rings to 6 full rings + 6 semi-circular rings (minor arc rings). The conductive ring material is reduced by more than 25%. Moreover, multiple conductive rings are concentrated in a single concentric circle, which reduces the axial height of the conductive rings, thereby reducing the axial height of the entire generator, reducing the weight of the unit, and lowering production costs. At the same time, the conductive ring structure arranged in the same layer can be directly introduced into the junction box, avoiding the need for irregularly shaped terminal designs, reducing manufacturing difficulty, preventing generator short circuits caused by insulation failure, and improving the stability and reliability of equipment operation.
[0049] In this embodiment of the invention, several uniformly arranged insulating blocks are installed between the complete circular ring of the winding and the minor arc ring of the winding in each U-phase conductive ring group 4-1, V-phase conductive ring group 4-2 and W-phase conductive ring group 4-3.
[0050] In addition, in this embodiment of the invention, the first winding 1U-1V-1W, the second winding 2U-2V-2W, the third winding 3U-3V-3W, and the fourth winding 4U-4V-4W are each provided with a junction box; the first winding junction boxes corresponding to the first winding 1U-1V-1W and the second winding 2U-2V-2W are respectively connected to the first converter 7-1 via cable 6; the third winding junction boxes corresponding to the third winding 3U-3V-3W and the fourth winding 4U-4V-4W are respectively connected to the second converter 7-2 via cable 6.
[0051] Specifically, in this embodiment of the invention, the coils corresponding to the first winding 1U-1V-1W are evenly arranged in the second semicircle. The U-phase, V-phase, and W-phase currents of the first winding 1U-1V-1W are introduced into the junction box of the first winding cable through the corresponding first winding 1U ring 4-1-1, first winding 1V ring 4-2-1, and first winding 1W 4-3-1, respectively. The coils corresponding to the second winding 2U-2V-2W are evenly arranged in the first semicircle. The U-phase, V-phase, and W-phase currents of the second winding 2U-2V-2W are introduced into the second winding cable through the corresponding second winding 2U ring 4-1-2, second winding 2V ring 4-2-2, and second winding 2W ring 4-3-2, respectively. In the junction box; the coils corresponding to the third winding 3U-3V-3W are evenly arranged in the second semicircle. The U-phase, V-phase, and W-phase currents of the third winding 3U-3V-3W are introduced into the junction box of the third winding cable through the corresponding third winding 3U ring 4-1-3, third winding 3V ring 4-2-3, and third winding 3W ring 4-3-3, respectively. The coils corresponding to the fourth winding 4U-4V-4W are evenly arranged in the first semicircle. The U-phase, V-phase, and W-phase currents of the fourth winding 4U-4V-4W are introduced into the junction box of the fourth winding cable through the corresponding fourth winding 4U ring 4-1-4, fourth winding 4V ring 4-2-4, and fourth winding 4W ring 4-3-4, respectively.
[0052] With the above settings, when the generator is running, the current from the first winding 1U-1V-1W and the second winding 2U-2V-2W is input to the booster station through the first converter 7-1. When any one or both of the third winding 3U-3V-3W and the fourth winding 4U-4V-4W fail, the generator operates at half power. Similarly, the current from the third winding and the fourth winding 4U-4V-4W is input to the booster station through the second converter 7-2. When any one or both of the first winding 1U-1V-1W and the second winding 2U-2V-2W fail, the generator operates at half power. Since the remaining windings are evenly distributed around the entire circumference of the motor, the circumference of the motor is evenly stressed, reducing motor vibration and noise, and achieving a redundant design.
[0053] Preferably, the junction boxes corresponding to the first set of windings 1U-1V-1W and the second set of windings 2U-2V-2W are symmetrically arranged with respect to the connection lines of the third set of windings 3U-3V-3W and the fourth set of windings 4U-4V-4W about the 6 o'clock and 12 o'clock points.
[0054] like Figure 4 , 5 As shown, the present invention also provides a generator stator composed of a conductive ring structure with multiple sets of windings (such as 4 sets of windings in this embodiment) and a wind turbine generator formed from the generator stator. The generator stator includes a stator core 1 and stator coils 2. The stator coils 2 are evenly distributed in the stator core 1. The conductive ring structure 4 is fixed to the stator core 1 by conductive ring support rods 3. The U-phase conductive ring group 4-1, V-phase conductive ring group 4-2, and W-phase conductive ring group 4-3 of the conductive ring structure 4 are all welded with lead-out terminals 5. The lead-out terminals 5 are electrically connected to the cable 6 in the junction box. The wind turbine generator is connected to the converter 7 through the conductive ring structure 4 on the generator stator. When the generator is running, the current generated by the stator coils 2 is collected through the conductive ring structure 4, and then fed into the converter 7 through the cable 6 via the lead-out terminals 5, thereby realizing power generation.
[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 structure for a motor with multiple windings, characterized in that, The conductive ring structure (4) includes a U-phase conductive ring group (4-1), a V-phase conductive ring group (4-2), and a W-phase conductive ring group (4-3). The U-phase conductive ring group (4-1), the V-phase conductive ring group (4-2), and the W-phase conductive ring group (4-3) are arranged in a ring-shaped spacing from the outside to the inside and are located on the same horizontal plane. Each of the U-phase conductive ring group (4-1), V-phase conductive ring group (4-2) and W-phase conductive ring group (4-3) has the same structural layout. Each phase conductive ring group consists of 2N winding full circular rings and 2N winding minor arc rings. The virtual circle spacing formed by every 2 winding minor arc rings is set between the 2 winding full circular rings. At the same time, multiple winding full circular rings and multiple winding minor arc rings are located on a concentric circle to form 4N sets of windings. The 4N sets of windings are divided into 2 groups, and each group is connected to the external converter (7) separately. Where all N are integers greater than or equal to 1.
2. The motor conductive ring structure with multiple windings according to claim 1, characterized in that, The conductive ring structure (4) includes four sets of windings, which are respectively labeled as the first set of windings (1U-1V-1W), the second set of windings (2U-2V-2W), the third set of windings (3U-3V-3W) and the fourth set of windings (4U-4V-4W). The first set of windings (1U-1V-1W) and the second set of windings (2U-2V-2W) are one group, and the third set of windings (3U-3V-3W) and the fourth set of windings (4U-4V-4W) are another group.
3. The motor conductive ring structure with multiple windings according to claim 2, characterized in that, The conductive ring structure divides the body into two halves by connecting the 6 and 12 points, and these halves are marked as the first semicircle and the second semicircle. The 2N minor arc rings in each phase conductive ring group are located in the first semicircle and the second semicircle, respectively. The second set of windings (2U-2V-2W) and the fourth set of windings (4U-4V-4W) are located in the first semicircle, the first set of windings (1U-1V-1W) and the third set of windings (3U-3V-3W) are located in the second semicircle, the first set of windings (1U-1V-1W) and the second set of windings (2U-2V-2W) are respectively connected to the external first converter (7-1), and the third set of windings (3U-3V-3W) and the fourth set of windings (4U-4V-4W) are respectively connected to the external second converter (7-2).
4. The motor conductive ring structure with multiple windings according to claim 3, characterized in that, The U-phase conductive ring group (4-1) consists of a first set of winding 1U ring (4-1-1), a second set of winding 2U ring (4-1-2), a third set of winding 3U ring (4-1-3), and a fourth set of winding 4U ring (4-1-4). The first set of winding 1U ring (4-1-1) and the fourth set of winding 4U ring (4-1-4) are complete circular rings, while the second set of winding 2U ring (4-1-2) and the third set of winding 3U ring (4-1-3) are minor arc rings. The circle formed by the second set of winding 2U ring (4-1-2) and the third set of winding 3U ring (4-1-3) is virtually equidistantly arranged between the first set of winding 1U ring (4-1-1) and the fourth set of winding 4U ring (4-1-4). The V-phase conductive ring group (4-2) consists of a first set of winding 1V ring (4-2-1), a second set of winding 2V ring (4-2-2), a third set of winding 3V ring (4-2-3), and a fourth set of winding 4V ring (4-2-4). The first set of winding 1V ring (4-2-1) and the fourth set of winding 4V ring (4-2-4) are complete circular rings, while the second set of winding 2V ring (4-2-2) and the third set of winding 3V ring (4-2-3) are minor arc rings. The circle formed by the second set of winding 2V ring (4-2-2) and the third set of winding 3V ring (4-2-3) is virtually equidistantly arranged between the first set of winding 1V ring (4-2-1) and the fourth set of winding 4V ring (4-2-4). The W-phase conductive ring group (4-3) consists of a first set of winding 1W ring (4-3-1), a second set of winding 2W ring (4-3-2), a third set of winding 3W ring (4-3-3), and a fourth set of winding 4W ring (4-3-4). The first set of winding 1W ring (4-3-1) and the fourth set of winding 4W ring (4-3-4) are complete circular rings, while the second set of winding 2W ring (4-3-2) and the third set of winding 3W ring (4-3-3) are minor arc rings. The circle formed by the second set of winding 2W ring (4-3-2) and the third set of winding 3W ring (4-3-3) is virtually equidistantly arranged between the first set of winding 1W ring (4-3-1) and the fourth set of winding 4W ring (4-3-4).
5. The motor conductive ring structure with multiple windings according to claim 3, characterized in that, The first set of windings (1U-1V-1W), the second set of windings (2U-2V-2W), the third set of windings (3U-3V-3W), and the fourth set of windings (4U-4V-4W) are each equipped with a junction box. The first winding junction box and the second winding junction box corresponding to the first winding (1U-1V-1W) and the second winding (2U-2V-2W) are respectively connected to the first converter (7-1) via cable (6); the third winding junction box and the fourth winding junction box corresponding to the third winding (3U-3V-3W) and the fourth winding (4U-4V-4W) are respectively connected to the second converter (7-2) via cable (6).
6. The motor conductive ring structure with multiple windings according to claim 5, characterized in that, The coils corresponding to the first set of windings (1U-1V-1W) are evenly arranged in the second semicircle. The U-phase, V-phase and W-phase currents of the first set of windings (1U-1V-1W) are introduced into the first set of winding cable junction box through the corresponding first set of winding 1U ring (4-1-1), first set of winding 1V ring (4-2-1) and first set of winding 1W ring (4-3-1), respectively. The coils corresponding to the second set of windings (2U-2V-2W) are evenly arranged in the first semicircle. The U-phase, V-phase and W-phase currents of the second set of windings (2U-2V-2W) are introduced into the second set of winding cable junction box through the corresponding second set of windings 2U ring (4-1-2), second set of windings 2V ring (4-2-2) and second set of windings 2W ring (4-3-2), respectively. The coils corresponding to the third winding (3U-3V-3W) are evenly arranged in the second semicircle. The U-phase, V-phase and W-phase currents of the third winding (3U-3V-3W) are introduced into the cable junction box of the third winding through the corresponding 3U ring (4-1-3), 3V ring (4-2-3) and 3W ring (4-3-3) of the third winding, respectively. The coils corresponding to the fourth winding (4U-4V-4W) are evenly arranged in the first semicircle. The U-phase, V-phase and W-phase currents of the fourth winding (4U-4V-4W) are introduced into the fourth winding cable junction box through the corresponding fourth winding 4U ring (4-1-4), fourth winding 4V ring (4-2-4) and fourth winding 4W ring (4-3-4), respectively.
7. The motor conductive ring structure with multiple windings according to claim 5, characterized in that, The junction boxes corresponding to the first set of windings (1U-1V-1W) and the second set of windings (2U-2V-2W) are symmetrically arranged with respect to the connection lines of the third set of windings (3U-3V-3W) and the fourth set of windings (4U-4V-4W) about the 6 o'clock and 12 o'clock points.
8. The motor conductive ring structure with multiple windings according to claim 1, characterized in that, In each of the U-phase conductive ring group (4-1), V-phase conductive ring group (4-2), and W-phase conductive ring group (4-3), several uniformly distributed insulating blocks are installed between the full circular ring of the winding and the minor arc ring of the winding.
9. A generator stator composed of a multi-set winding motor conductive ring structure according to any one of claims 1 to 8, characterized in that, The generator stator includes a stator core (1) and a stator coil (2). The stator coil (2) is evenly distributed in the stator core (1). The conductive ring structure (4) is fixed on the stator core (1) by a conductive ring support rod (3). The U-phase conductive ring group (4-1), V-phase conductive ring group (4-2) and W-phase conductive ring group (4-3) of the conductive ring structure (4) are all welded with lead-out terminals (5). The lead-out terminals (5) are electrically connected to the cable (6) in the junction box.
10. A wind turbine generator, characterized in that, Including the generator stator according to claim 9, the wind turbine is connected to the converter (7) through the conductive ring structure (4) on the generator stator. When the generator is running, the current generated by the stator coil (2) is collected through the conductive ring structure (4) and then fed into the converter (7) through the lead-out terminal (5) via the cable (6), thereby realizing power generation.