A winding type rotor winding end fixing structure

Abstract

The application discloses a winding type rotor winding end fixing structure and relates to the technical field of motor accessories, which comprises an outer hoop assembly, an inner fixing ring and a plurality of elastic fixing assemblies. The outer hoop assembly comprises a plurality of layers of outer hoops, the layers of outer hoops are arranged at intervals along the axial direction of the rotor winding, each layer of outer hoops comprises a plurality of sectional pressing plates, and the sectional pressing plates are sequentially spliced to form the outer hoop. The inner fixing ring is located inside the outer hoop assembly, a rotor winding end space is reserved between the outer hoop assembly and the inner fixing ring, the rotor winding end is located in the rotor winding end space, and the plurality of elastic fixing assemblies are sequentially threaded through the outer hoop assembly, the rotor winding end and the inner fixing ring to clamp and fix the rotor winding end. The fixing structure provided by the application can realize the replacement of the winding without the need of completely removing the end fixing structure, reduces the workload of winding maintenance, improves the heat dissipation effect of the winding end, improves the stress uniformity during the fixing of the winding end and reduces the radial deformation during the fixing of the rotor winding.

Description

Technical Field

[0001] This invention relates to the field of electric motor accessories technology, and more specifically to a winding end fixing structure for a wound rotor. Background Technology

[0002] The magnetic field of a wound rotor is generated by a current flowing through the rotor windings. The straight portion of the rotor windings is fixed inside the yoke core, while the ends are suspended. When the rotor rotates, the centrifugal force generated by the windings causes radial outward deformation at the winding ends. To prevent this deformation, the winding ends need to be fixed.

[0003] Currently, the following two methods are commonly used to fix the winding ends: (1) Heat-fitting structure. A whole round steel ring is heat-fitted onto the coil end to tighten the end, and the steel ring itself is used to bear the centrifugal force at the coil end. (2) Winding structure. The end is bound together with binding tape, and the binding tape itself is used to bear the centrifugal force at the coil end.

[0004] Both of the above fixing methods have the following disadvantages:

[0005] First, maintenance is difficult. When a winding is damaged and needs to be replaced, the end steel ring or binding tape must be completely removed, which greatly increases the amount of work involved in removing and reinstalling the winding.

[0006] Secondly, heat dissipation is difficult. Both of these fixing methods are fully enclosed, which increases the air resistance of the cooling airflow at the winding ends, hindering heat dissipation at the winding ends.

[0007] In addition, the winding has poor uniformity. Due to manufacturing and installation deviations, the winding ends are not perfect cylindrical structures; some windings protrude outwards, while others are concave inwards. Therefore, using steel ring heat sleeves or binding tape will result in greater radial constraint force on the protruding windings, while the concave windings will experience less force, leading to poor uniformity of force distribution.

[0008] Finally, the large radial deformation of the upper winding can easily damage the winding insulation. In existing fixing methods, the radial fixing force generated by the fixing structure acts entirely on the upper winding. The upper winding can only rely on its own stiffness to withstand this radial force. However, the winding ends are slender structures with poor inherent stiffness, making them prone to radial inward deformation under this radial force. This deformation can damage the winding insulation and affect the winding safety.

[0009] In the prior art, patent CN114567107A discloses a fixing device for the end of the rotor winding of a variable speed generator motor, including M sets of locking structures evenly distributed along the circumferential direction; the locking structure includes an outer support bar, a radial connecting member, an inner bracket, and an inner support bar disposed on its inner side, the outer support bar being vertically disposed on the outer side of the end of the upper winding of the rotor; the radial connecting member includes N U-bolts; the inner bracket is disposed inside the rotor winding, the cantilever end of the U-bolt sequentially passes through the outer support bar, the gap between the upper and lower windings of the rotor, the inner bracket, and the inner support bar, and the cantilever end of the U-bolt is fixedly connected to the inner support bar to fix the winding; this fixing device enables it to withstand the centrifugal force generated by the rotor rotation, while ensuring good ventilation and cooling of the winding.

[0010] While the aforementioned patent discloses a fixing device for the rotor winding ends of a generator motor, which solves the problems of ventilation, cooling, and ease of maintenance, the radial force generated when the U-bolts are tightened still relies on the stiffness of the upper winding, thus posing a risk of large radial deformation of the upper winding. Furthermore, the uniformity of stress distribution across the windings remains unresolved. For example, in the illustration of this patent embodiment, each outer support bar has five U-bolts arranged vertically. However, for a single winding, only two U-bolts are used for fixing. Moreover, the vertical positions of these two fixing U-bolts are inconsistent across different windings (i.e., some windings have U-bolts in the upper middle part, while others have them in the lower middle part). Therefore, the uniformity of stress distribution across different windings will inevitably differ. Summary of the Invention

[0011] To overcome the shortcomings of the prior art, this invention discloses a winding end fixing structure for a wound rotor. The purpose of this invention is to solve problems such as difficult maintenance, poor heat dissipation, poor uniformity of winding stress, and large radial deformation of the winding after fixing. This invention enables winding replacement without completely removing the end fixing structure, reducing the workload of winding maintenance; it improves the heat dissipation effect at the winding ends; it improves the uniformity of stress when the winding ends are fixed; and it reduces radial deformation of the winding after fixing.

[0012] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0013] A winding end fixing structure for a wound rotor includes an outer hoop assembly, an inner fixing ring, and several elastic fixing components;

[0014] The outer hoop assembly includes several layers of outer hoops, which are spaced apart along the rotor winding axis. Each layer of outer hoop includes several segmented pressure plates, which are sequentially spliced ​​together to form the outer hoop.

[0015] The inner fixing ring is located inside the outer hoop assembly. A space is reserved between the outer hoop assembly and the inner fixing ring for the rotor winding end. The rotor winding end is located within the rotor winding end space. The plurality of elastic fixing components pass through the outer hoop assembly, the rotor winding end, and the inner fixing ring in sequence to clamp and fix the rotor winding end.

[0016] Furthermore, the outer hoop assembly also includes several connecting plates, which are distributed circumferentially along the outer hoop assembly; within each outer hoop layer, the several segmented pressure plates are spliced ​​together by the several connecting plates to form a complete circular outer hoop; between the several outer hoop layers, the connecting plates are arranged along the rotor winding axis and connect the several outer hoop layers.

[0017] Furthermore, the segmented pressure plate and the connecting plate are connected by a dovetail or T-tail, and the connection point is located inside the outer hoop.

[0018] Furthermore, the connecting plate is provided with a plurality of first connecting holes.

[0019] Furthermore, the inner fixing ring includes a vertical ring, an upper ring, and a lower ring, with the upper ring and lower ring respectively disposed at the upper opening and lower opening of the vertical ring.

[0020] Furthermore, the vertical ring has a single-ring structure in the axial direction, and the vertical ring is provided with several second connecting holes and vertical ring ventilation holes.

[0021] Furthermore, the vertical ring is composed of multiple layers of spaced rings, which are connected to each other by connecting blocks to form a whole, and multiple ventilation grooves are formed between adjacent rings.

[0022] Furthermore, the upper ring is provided with several ventilation holes, and is also provided with a jumper wire fixing clamp for fixing the lateral jumper wire, and a lead wire fixing clamp for fixing the lead wire; the lower ring is the end pressure plate of the rotor core and is fixed to the rotor core by the core tensioning screw.

[0023] Furthermore, the elastic fixing assembly includes bolts, nuts, washers, sleeves, and elastic elements;

[0024] The bolt passes through the washer, outer hoop assembly, rotor winding end, inner fixing ring, washer, elastic element and sleeve in sequence from the outside to the inside, and is then connected to the nut. The sleeve is provided with a boss, and the elastic element is locked on the boss.

[0025] Furthermore, an insulating plate is provided between the inner fixing ring and the rotor winding end. The two sides of the insulating plate contact the inner fixing ring and the rotor winding end, respectively. The plurality of elastic fixing components sequentially pass through the outer hoop assembly, the rotor winding end, the insulating plate, and the inner fixing ring to clamp and fix the rotor winding end. The radial fixing force exerted on the winding by the elastic fixing components can be transmitted to the inner fixing ring through the insulating plate.

[0026] The beneficial effects of this invention are:

[0027] 1. The winding end fixing structure of the wound rotor provided by the present invention includes several segmented pressure plates in each layer of the outer hoop. The segmented pressure plates are spliced ​​together in sequence to form the outer hoop. The outer hoop adopts a split structure, which allows the winding to be replaced without removing the entire end fixing system. The workload of disassembling and reassembling the end fixing system is greatly reduced compared with the traditional structure.

[0028] 2. Compared to traditional fully enclosed end-mounted fixed structures, the outer rings of this invention are spaced apart along the rotor winding axially, and the outer rings are layered axially, providing a larger heat dissipation space at the winding ends. When the vertical rings in the inner fixed ring are composed of multiple layers of spaced rings, welded together by connecting blocks, and multiple ventilation grooves are formed between adjacent rings, airflow is allowed to pass radially through the winding ends, resulting in a more significant winding cooling effect. When the vertical rings of the inner fixed ring adopt a single-ring structure, the vertical ring ventilation holes provided on the vertical rings can also achieve the same effect.

[0029] 3. After repeated starts and stops of the rotor, the windings will repeatedly expand outward and contract inward. Traditional binding strap fixing structures, due to the poor elasticity of the binding straps, are prone to loosening after repeated cycles. The wound rotor winding end fixing structure provided by this invention uses an elastic fixing component that sequentially passes through the outer hoop assembly, the rotor winding end, and the inner fixing ring to fix it. The elastic fixing component has good elasticity and a certain amount of preload, effectively preventing bolt loosening.

[0030] 4. Traditional end-fixing structures using steel rings and binding straps can easily cause bending deformation of the windings, potentially damaging the winding insulation layer. This invention uses an inner fixing ring to withstand the radial inward fixing force at the winding ends, completely preventing bending deformation of the end windings.

[0031] 5. The outer end clamps of this invention are divided into several layers axially, forming multiple points of fixation for the rotor winding ends in the axial direction. For each bar constituting the winding, the number and position of the axial fixing points are the same, avoiding the problem of inconsistent U-bolt positions on each bar in the patent with publication number CN114567107A, effectively ensuring the uniformity of force on the rotor winding. Furthermore, due to manufacturing and installation errors, the outer surface of the winding ends is not a regular cylindrical surface. Therefore, traditional steel sleeve structures or binding strap structures inevitably result in greater radial fixing forces on radially protruding windings and less force on radially recessed windings. Because each layer of the outer end clamps in this invention adopts a split structure, the difference in radial position of the windings within a segmented end clamp range will be greatly reduced. Therefore, when radially fixing the windings in this area, the difference in radial force is also reduced accordingly, thereby improving the uniformity of force distribution. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the present invention;

[0033] Figure 2 This is a schematic diagram of the connection between the segmented pressure plate and the connecting plate, viewed from the inside, according to the present invention.

[0034] Figure 3 This is a schematic diagram of one form of the inner fixing ring of the present invention;

[0035] Figure 4 This is a schematic diagram of another form of the inner fixing ring of the present invention;

[0036] Figure 5 This is a cross-sectional view of the present invention;

[0037] Figure 6 for Figure 5 Enlarged view of part A in the image;

[0038] Figure 7 This is a schematic diagram of the insulating plate of the present invention;

[0039] Figure label:

[0040] 1. Outer hoop assembly; 11. Segmented pressure plate; 12. Connecting plate; 13. First connecting hole; 2. Inner fixing ring; 201. Vertical ring; 202. Upper ring; 203. Lower ring; 204. Second connecting hole; 205. Ring; 206. Connecting block; 207. Ventilation groove; 208. Ventilation hole; 209. Lateral jumper wire; 210. Jumper wire fixing clamp; 211. Lead wire; 212. Lead wire fixing clamp; 3. Elastic fixing assembly; 31. Bolt; 32. Nut; 33. Washer; 34. Sleeve; 35. Elastic element; 4. Rotor winding end; 5. Rotor core; 6. Insulation plate. Detailed Implementation

[0041] The following will provide a clear and complete description of the concept, specific structure, and technical effects of the present invention in conjunction with the embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention.

[0042] Example 1

[0043] A type of wound rotor winding end fixing structure, such as Figure 1-2 As shown, it includes an outer hoop assembly 1, an inner fixing ring 2, and several elastic fixing components 3;

[0044] The outer hoop assembly 1 includes several layers of outer hoop, which are spaced apart along the rotor winding axis. Each layer of outer hoop includes several segmented pressure plates 11, which are sequentially spliced ​​together to form the outer hoop.

[0045] The inner fixing ring 2 is located inside the outer hoop assembly 1. A space is reserved between the outer hoop assembly 1 and the inner fixing ring 2 for the rotor winding end. The rotor winding end 4 is located in the rotor winding end space. Several elastic fixing components 3 pass through the outer hoop assembly 1, the rotor winding end 4 and the inner fixing ring 2 in sequence to clamp and fix the rotor winding end 4.

[0046] In this embodiment, the outer hoop assembly 1 is used to fix the end of the wound rotor winding from the outside. Multiple layers of outer hoops are distributed axially on the outer side of the coil end. Each layer of outer hoop includes several segmented pressure plates 11, which are sequentially spliced ​​together to form the outer hoop. The advantage of using segmented pressure plates 11 for the outer hoop is that when a winding needs to be removed, only its corresponding segmented pressure plate 11 needs to be removed to disconnect the winding from the end fixing system, without having to remove the entire end fixing system as in traditional structures. Furthermore, the outer hoops are spaced apart along the rotor winding axially, and the axial layering of the outer hoop creates a heat dissipation space between adjacent layers, resulting in a larger heat dissipation space at the winding end.

[0047] The inner fixing ring 2 is used to fix the ends of the wound rotor winding from the inside. Traditional end-fixing structures, such as steel rings and binding straps, exert forces on the upper winding that can easily cause bending deformation, potentially damaging the winding insulation layer. In this embodiment, the inner fixing ring 2 is used to withstand the radial inward fixing force at the winding ends, completely preventing bending deformation of the end windings.

[0048] In this embodiment, as Figure 6 and 7 As shown, an insulating plate 6 is provided between the inner fixing ring 2 and the rotor winding end 4. The two sides of the insulating plate 6 contact the inner fixing ring 2 and the rotor winding end 4, respectively. Several elastic fixing components 3 sequentially pass through the outer hoop assembly 1, the rotor winding end 4, the insulating plate 6, and the inner fixing ring 2 to clamp and fix the rotor winding end 4. The radial fixing force acting on the winding by the elastic fixing components 3 can be transmitted to the inner fixing ring 2 through the insulating plate 6.

[0049] The elastic fixing component 3 is used to secure the outer hoop assembly 1, the rotor winding end 4, the insulating plate 6, and the inner fixing ring 2 together. After multiple starts and stops of the rotor, the winding will repeatedly expand outward and contract inward. Traditional binding strap fixing structures, due to the poor elasticity of the binding straps, are prone to loosening after repeated cycles. This embodiment uses the elastic fixing component 3, which has good elasticity and can effectively prevent bolt loosening.

[0050] Example 2

[0051] This embodiment further elaborates on the outer hoop assembly 1 based on Embodiment 1, such as... Figure 1-2 As shown, the outer hoop assembly 1 also includes several connecting plates 12, which are distributed circumferentially along the outer hoop assembly 1; within each outer hoop layer, several segmented pressure plates 11 are spliced ​​together by several connecting plates 12 to form a complete circular outer hoop; between several outer hoop layers, the connecting plates 12 are arranged along the rotor winding axis and connect several outer hoop layers.

[0052] In this embodiment, the connecting plate 12 has two functions: firstly, it connects several segmented pressure plates 11 within each layer of the outer hoop, allowing the segmented pressure plates 11 to be spliced ​​into a complete circular outer hoop; secondly, it connects several layers of outer hoop, enabling them to form a single integrated structure. When a winding needs to be removed, only the segmented pressure plate 11 between two connecting plates 12 needs to be removed to disconnect the winding from the end fixing system, without having to dismantle the entire end fixing system as in traditional structures.

[0053] In this embodiment, the segmented pressure plate 11 and the connecting plate 12 are connected by a dovetail or T-tail, and the connection point is located inside the outer hoop. The dovetail or T-tail connection makes it convenient to install and remove the segmented pressure plate 11. At the same time, the connection point is located inside the outer hoop, so that the connecting plate 12 can be used to press the segmented pressure plate 11 tightly to prevent it from falling off.

[0054] The connecting plate 12 has several first connecting holes 13, which are bolt holes. The bolts of the elastic fixing component 3 pass through these holes and are fixed to the inner fixing ring 2, thereby fixing the coil end to the inner fixing ring 2 arranged inside the rotor winding and preventing the coil end from displacing radially outward. Alternatively, the above-mentioned first connecting holes 13 can also be provided on the segmented pressure plate 11 to fix the segmented pressure plate 11 to the inner fixing ring 2 by the elastic fixing component 3.

[0055] Example 3

[0056] This embodiment further elaborates on the inner fixing ring 2 based on embodiment 2, such as... Figure 3 and 4As shown, the inner fixing ring 2 includes a vertical ring 201, an upper ring 202, and a lower ring 203. The upper ring 202 and the lower ring 203 are respectively disposed at the upper opening and the lower opening of the vertical ring 201. In this embodiment, the vertical ring serves as a fixing member at the end of the winding, and is used to withstand the radial force when the elastic fixing component 3 is tightened, as well as the radial force at the end of the winding.

[0057] like Figure 3 As shown in the illustration, in one embodiment, the vertical ring 21 is rolled or welded from a single sheet of steel. Several second connecting holes 204 and vertical ring ventilation holes are provided on the steel plate. The second connecting holes 204 align with the first connecting holes 13. Bolts of the elastic fixing component 3 pass through the second connecting holes 204 and the first connecting holes 13, fixing the outer hoop assembly 1, the rotor winding end 4, and the inner fixing ring 2. The vertical ring ventilation holes and the heat dissipation space of the outer hoop are both heat dissipation designs. Together, they provide a larger heat dissipation space at the winding end, allowing airflow to pass radially from the winding end, resulting in a more significant cooling effect on the winding.

[0058] like Figure 4 As shown in the illustration, in one embodiment, the vertical ring 21 is composed of multiple layers of spaced rings 205, which are connected as a whole by connecting blocks 206. Multiple ventilation grooves 207 are formed between adjacent rings 205. In this embodiment, the vertical ring 21 is composed of multiple layers of rings 205, which are welded together by connecting blocks 206. The advantage of this structure is that it forms multiple ventilation grooves 207 in the axial direction, which is beneficial for ventilation and cooling of the winding ends. The ventilation grooves 207 and the heat dissipation space of the outer hoop are both heat dissipation designs. Their combination provides a larger heat dissipation space at the winding ends, allowing airflow to pass radially through the winding ends, resulting in a more significant cooling effect. In this embodiment, the ventilation grooves 207 can be used as bolt holes for the elastic fixing component 3.

[0059] like Figure 5 As shown, the upper ring 202 has several ventilation holes 208. These holes serve as ventilation and cooling ducts, and also as access passages for installers to enter the fixing ring and tighten bolts. The upper ring 202 also has a jumper clamp 210 for fixing the lateral jumper wire 209, and a lead wire clamp 212 for fixing the lead wire 211, acting as a fixing ring for the rotor lead wire clamps. The lower ring 23 is the end pressure plate of the rotor core 5 and is fixed to the rotor core 5 by a core tensioning screw.

[0060] Example 4

[0061] This embodiment further elaborates on the elastic fixing component 3 based on embodiment 3, such as... Figure 5 and 6As shown, the elastic fixing assembly 3 includes a bolt 31, a nut 32, a washer 33, a sleeve 34, and an elastic element 35. The bolt 31 passes sequentially from the outside to the inside through the washer 33, the outer clamp assembly 1, the rotor winding end 4, the inner fixing ring 2, the washer 33, the elastic element 35, and the sleeve 34 before connecting to the nut 32. A boss is provided on the sleeve 34, and the elastic element 35 is engaged with the boss. The elastic element 35 is a disc spring.

[0062] In this embodiment, the elastic fixing assembly 3 mainly consists of a bolt 31, a nut 32, a washer 33, a sleeve 34, and an elastic element 35. The arrangement is as follows: the bolt 31 is fitted with a sleeve 34, which in turn is fitted with the elastic element 35. The sleeve 34 has a boss, which can be used to compress the elastic element 35 by applying external force. The washer 33 is positioned between the elastic element 35 and the inner wall of the vertical coil. When the nut 32 is tightened, the elastic element 35 is compressed, thereby providing a certain preload to the bolt 31 and fixing the winding end to the vertical coil.

[0063] In one embodiment, the elastic element can be a disc spring. Multiple disc springs can be aligned or stacked together in a certain manner. After the bolt 31 is tightened, a certain preload and compression can be stored in the disc spring. The preload of this elastic element is essential and effective in ensuring that the bolt does not loosen. When the rotor is running, the winding ends expand outward due to centrifugal force; when the rotor stops, the winding ends begin to contract inward. This repeated action can easily cause the engaging screw to loosen, but the elastic force stored in the elastic element can ensure the tension of the bolt, thereby effectively preventing the bolt 31 from loosening.

[0064] The embodiments of the present invention have been described in detail above, but the present invention is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalents or substitutions are all included within the scope defined by the claims of the present invention.

Claims

1. A wound rotor winding end fixation structure characterized by: The application relates to a rotor winding fixing device, which comprises an outer hoop assembly (1), an inner fixing ring (2) and a plurality of elastic fixing assemblies (3). The outer hoop assembly (1) comprises a plurality of layers of outer hoops which are arranged at intervals along the rotor winding axis, and each layer of outer hoops comprises a plurality of sectional pressing plates (11) which are sequentially spliced to form the outer hoop. The inner fixing ring (2) comprises a vertical ring (201), an upper ring (202) and a lower ring (203), the upper ring (202) and the lower ring (203) are arranged at upper and lower openings of the vertical ring (201) respectively, and the vertical ring (201) serves as a radial force main body. The inner fixing ring (2) is located inside the outer hoop assembly (1), a rotor winding end portion space is reserved between the outer hoop assembly (1) and the inner fixing ring (2), a rotor winding end portion (4) is located in the rotor winding end portion space, the plurality of elastic fixing assemblies (3) sequentially pass through the outer hoop assembly (1), the rotor winding end portion (4) and the inner fixing ring (2) to clamp and fix the rotor winding end portion (4), so that the radial fixing force of the outer hoop assembly (1) on the rotor winding end portion (4) is transmitted to the vertical ring (201) of the inner fixing ring (2).

2. The wound rotor winding end fixation structure as set forth in claim 1, characterized by: The outer hoop assembly (1) further comprises a plurality of connecting plates (12) which are distributed in the circumferential direction of the outer hoop assembly (1); in each layer of outer hoops, the plurality of sectional pressing plates (11) are spliced into a whole-circle outer hoop through the plurality of connecting plates (12); and between the plurality of layers of outer hoops, the connecting plates (12) are arranged along the rotor winding axis and connect the plurality of layers of outer hoops.

3. The wound rotor winding end fixation structure as set forth in claim 2, characterized by: The sectional pressing plate (11) and the connecting plate (12) are connected through a dove tail or a T tail, and the connecting position is located on the inner side of the outer hoop.

4. The wound rotor winding end fixation structure as set forth in claim 2, characterized by: A plurality of first connecting holes (13) are formed in the connecting plate (12).

5. The wound rotor winding end fixation structure as set forth in claim 1, characterized by: The vertical ring (201) is a single-ring structure in the axial direction, a plurality of second connecting holes (204) and vertical ring ventilation holes are formed in the vertical ring (201).

6. The wound rotor winding end fixation structure as set forth in claim 1, characterized by: The vertical ring (201) is composed of a plurality of ring circles (205) which are arranged at intervals, the ring circles (205) are connected into a whole through connecting blocks (206), and a plurality of ventilation grooves (207) are formed between adjacent two ring circles (205).

7. The wound rotor winding end fixation structure as set forth in claim 1, characterized by: A plurality of ventilation holes (208) are formed in the upper ring (202), the upper ring (202) is further provided with a cross-line fixing clamp (210) for fixing a lateral cross line (209) and a lead-out line fixing clamp (212) for fixing a lead-out line (211); and the lower ring is an end pressing plate of a rotor core (5) and is fixed with the rotor core (5) through a core tensioning screw.

8. The wound rotor winding end fixation structure as set forth in claim 1, characterized by: The elastic fixing assembly (3) comprises a bolt (31), a nut (32), a gasket (33), a sleeve (34) and an elastic element (35). The bolt (31) passes through the gasket (33), the outer hoop assembly (1), the rotor winding end (4), the inner fixing ring (2), the gasket (33), the elastic element (35) and the sleeve (34) in sequence from outside to inside and is connected with the nut (32), the sleeve (34) is provided with a boss, and the elastic element (35) is clamped on the boss.

9. The wound rotor winding end fixation structure as set forth in claim 1, characterized by: Insulating plates (6) are arranged between the inner fixing ring (2) and the rotor winding end (4), the two sides of the insulating plate (6) are in contact with the inner fixing ring (2) and the rotor winding end (4) respectively, and the plurality of elastic fixing assemblies (3) clamp and fix the rotor winding end (4) by passing through the outer hoop assembly (1), the rotor winding end (4), the insulating plate (6) and the inner fixing ring (2) in sequence.

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