A generator rotor winding wedge pad assembly structure

Abstract

This utility model relates to a generator rotor winding wedge pad assembly structure, including a wedge pad, a damping winding, and a slot wedge arranged sequentially from bottom to top on the upper end of the rotor winding. The slot wedge engages with the top opening of the rotor slot. The wedge pad includes a pad body and a sliding layer placed on the upper end face of the pad body. The center of the upper end face of the pad body has a through groove along its axial direction. Multiple arc-shaped grooves are distributed along its axial direction on both sides of the through groove on the upper end face of the pad body. Each arc-shaped groove has a through hole at its bottom to the bottom end face of the pad body. The opening of the arc-shaped groove faces the sliding layer. The arc-shaped grooves on both sides are staggered and sequentially arranged, and the through holes in the arc-shaped grooves on both sides are sequentially aligned. The sliding layer contacts the damping winding. This utility model has the following advantages: optimized ventilation path, increased contact area between airflow and damping winding, and improved heat dissipation efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of rotors, specifically relating to a combination structure of wedge pads for generator rotor windings. Background Technology

[0002] In the rotor structure, the wedge-shaped pad assembly securely holds the rotor windings within the rotor slots, preventing displacement or erratic movement due to electromagnetic forces, centrifugal forces, etc., during motor operation. This ensures the positional accuracy of the rotor windings. The damping winding, embedded on the wedge-shaped pad, senses changes in the rotor's magnetic field and generates damping torque to suppress rotor oscillation. The slot wedge presses against the damping winding and engages with the top of the rotor slot, firmly fixing the windings and damping windings within the slots.

[0003] Existing wedge-shaped spacers are mostly rectangular in shape. To ensure the heat dissipation of the rotor structure, multiple heat dissipation holes are usually set on the wedge-shaped spacers. In high-power generators that operate for long periods of time, a large amount of heat is generated. Relying solely on multiple heat dissipation holes is insufficient to quickly dissipate the heat. Moreover, there is significant airflow resistance, making it difficult to form effective convection to carry away the flow, which affects the overall heat dissipation efficiency and can easily lead to excessively high winding temperatures and accelerated insulation aging. Utility Model Content

[0004] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a generator rotor winding wedge pad combination structure, which optimizes the ventilation path, increases the contact area between the airflow and the damping winding, and improves the heat dissipation efficiency.

[0005] The purpose of this utility model is achieved through the following technical solution: a generator rotor winding wedge pad assembly structure, wherein the rotor is composed of multiple rotor slots with equal circumferential distribution and rotor windings placed in the rotor slots, and the rotor windings of each rotor slot are positioned in the rotor slot by the wedge pad assembly structure, including a wedge pad, a damping winding and a slot wedge arranged sequentially from bottom to top at the upper end of the rotor winding, and the slot wedge is engaged with the top opening of the rotor slot; The wedge-shaped pad includes a pad body and a sliding layer placed on the upper end face of the pad body. The center of the upper end face of the pad body has a through groove along its axial direction. The upper end face of the pad body has multiple arc-shaped grooves distributed along its axial direction at positions on both sides of the through groove. The bottom of each arc-shaped groove has a through hole to the bottom end face of the pad body. The opening of the arc-shaped groove faces the sliding layer. The arc-shaped grooves on both sides are staggered and arranged in sequence, and the through holes in the arc-shaped grooves on both sides are arranged in sequence. The sliding layer is in contact with the damping winding.

[0006] A further improvement of this utility model is that: the two ends of the through hole along the extension direction of its through groove are arc surfaces facing each other, and the two corresponding through holes are arranged axially symmetrically.

[0007] A further improvement of this utility model is that the spacing between the multiple arc-shaped grooves on each side is consistent, and the spacing between each pair of corresponding arc-shaped grooves is 15-25mm.

[0008] A further improvement of this utility model is that the through groove is an isosceles trapezoidal structure that is wider at the top and narrower at the bottom.

[0009] A further improvement of this utility model is that: the radial sides of the pad body have stop bars for limiting the damping winding, and the stop bars have multiple ventilation holes.

[0010] A further improvement of this utility model is that the material of the sliding layer is polytetrafluoroethylene cotton cloth, and the thickness of the sliding layer is 2-3mm.

[0011] This utility model has the following advantages compared with the prior art: 1. This utility model provides a specially structured through groove, arc groove, and through hole on the upper end face of the pad body, which can form an air convection channel. Hot air will rise due to its lower density, while cold air will be supplemented from below or other channels, forming natural convection and improving heat dissipation efficiency. Secondly, the through groove, arc groove, and through hole change the heat conduction path inside the wedge pad, so that the heat can be evenly distributed on the entire wedge pad, avoiding local overheating. 2. The wedge pad adopts a design with corresponding staggered arc grooves on both sides and corresponding through holes. The staggered structure can disperse stress, enhance structural stability and load-bearing capacity, and avoid local deformation and damage. In terms of heat dissipation, the staggered arc grooves change the air flow path and enhance disturbance. Combined with the through holes, it promotes air convection, increases the heat dissipation area, and improves heat dissipation efficiency. 3. The two ends of the through hole are arc surfaces facing each other, and the through holes on both sides are symmetrically distributed to form a symmetrical airflow channel. This design can balance the air pressure on both sides of the rotor and reduce vibration caused by uneven airflow. Attached Figure Description

[0012] Figure 1 This is a schematic diagram showing the position of the wedge-shaped pad assembly structure in the rotor slot of this utility model.

[0013] Figure 2 This is a schematic diagram of the wedge-shaped pad assembly structure in this utility model.

[0014] Figure 3 This is a top view of the wedge-shaped pad assembly structure in this utility model.

[0015] Figure 4 This is a schematic diagram of the structure of Embodiment 2 of this utility model.

[0016] Numbering on the map: 1-Rotor slot, 2-Rotor winding, 3-Under-wedge pad, 4-Damping winding, 5-Slot wedge; 31-Sliding layer, 32-Push strip body, 33-Through hole, 34-Arc groove, 35-Stop strip, 36-Ventilation hole, 37-Through groove, 38-Circular arc surface. Detailed Implementation

[0017] To enhance understanding of this utility model, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. These embodiments are only used to explain the present utility model and do not constitute a limitation on the scope of protection of the present utility model.

[0018] In the description of this utility model, it should be understood that the terms indicating orientation or positional relationship, such as those based on the orientation or positional relationship shown in the drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the structure or unit referred to must have a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0019] In this utility model, unless otherwise explicitly specified and limited, terms such as “connection,” “provided with,” and “have” should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can be described as a mechanical connection, a direct connection, or a connection through an intermediate medium. Those skilled in the art can understand the basic meaning of the above terms in this utility model according to the specific circumstances. Example 1

[0020] A generator rotor winding wedge pad assembly structure, referring to Figure 1 The rotor consists of multiple rotor slots 1 with equal circumferential distribution and rotor windings 2 placed in the rotor slots 1. The rotor windings 2 of each rotor slot 1 are positioned in the rotor slot 1 by a wedge pad assembly structure, including a wedge pad 3, a damping winding 4 and a slot wedge 5 arranged sequentially from bottom to top on the upper end of the rotor winding 2. The slot wedge 5 is engaged with the top opening of the rotor slot 1. Reference Figure 2 , Figure 3 The wedge-shaped pad 3 includes a pad body 32 and a sliding layer 31 placed on the upper end face of the pad body 32. The center of the upper end face of the pad body 32 has a through groove 37 along its axial direction. The upper end face of the pad body 32 has multiple arc-shaped grooves 34 distributed along its axial direction at the positions on both sides of the through groove 37. The bottom of each arc-shaped groove 34 has a through hole 33 from the bottom end face of the pad body 32. The opening of the arc-shaped groove 34 is set facing the sliding layer 31. The arc-shaped grooves 31 on both sides are staggered and arranged in sequence, and the through holes 33 in the arc-shaped grooves 31 on both sides are arranged in sequence. The sliding layer 31 is in contact with the damping winding 4.

[0021] This invention features a specially structured through groove 37, arc groove 34, and through hole 33 on the upper end face of the pad body 32, which can form an air convection channel. Hot air, due to its lower density, will rise, while cold air will be replenished from below or other channels, forming natural convection and improving heat dissipation efficiency. Secondly, the through groove 37, arc groove 34, and through hole 33 change the heat conduction path inside the wedge pad, so that heat can be evenly distributed on the entire wedge pad 3, avoiding local overheating.

[0022] The wedge pad 3 adopts a design with corresponding staggered arc grooves 34 on both sides and corresponding through holes 33. The staggered structure can disperse stress, enhance structural stability and load-bearing capacity, and avoid local deformation and damage. In terms of heat dissipation, the staggered arc grooves 34 change the air flow path and enhance disturbance. Combined with the through holes, they promote air convection, increase the heat dissipation area, and improve heat dissipation efficiency.

[0023] Based on this embodiment, the two ends of the through hole 33 along the extension direction of its through groove 37 are oppositely arranged arc surfaces 38, and the two corresponding through holes 33 are arranged axially symmetrically.

[0024] The two ends of the through hole 33 are arc surfaces 38 facing each other, and the through holes 33 on both sides are symmetrically distributed, which can form a symmetrical airflow channel. This design can balance the air pressure on both sides of the rotor and reduce vibration caused by uneven airflow.

[0025] Based on this embodiment, the spacing of the multiple arc-shaped grooves 34 on each side is consistent, and the spacing between each pair of corresponding arc-shaped grooves 34 is staggered by 15-25mm.

[0026] Based on this embodiment, the through groove 37 is an isosceles trapezoidal structure that is wider at the top and narrower at the bottom.

[0027] The through-slot 37 is designed in the shape of an isosceles trapezoid, wider at the top and narrower at the bottom. The wider top facilitates the entry of hot air, while the narrower bottom increases the airflow velocity, creating strong convection and efficiently removing heat. At the same time, it increases the heat dissipation area of ​​the slot wall, improving heat dissipation efficiency. The trapezoidal structure of the through-slot 37 can disperse pressure, avoid stress concentration, and enhance the stability and load-bearing capacity of the wedge pad 3. Example 2

[0028] Based on Embodiment 1, the pad body 32 has baffles 35 on both radial sides to limit the damping winding 4, and the baffles 35 have multiple ventilation holes 36.

[0029] The baffle 35 can precisely fix the position of the damping winding 4, preventing it from shifting or shaking during operation, ensuring stable operation of the equipment, reducing the risk of failure, and the ventilation hole 3 creates a good air circulation channel, which is conducive to the dissipation of heat generated during equipment operation, avoiding local overheating, and extending the service life of the damping winding 4 and the overall equipment.

[0030] In this embodiment, the sliding layer 31 is made of polytetrafluoroethylene (PTFE) cotton cloth, and its thickness is 2-3 mm. PTFE cotton cloth has an extremely low coefficient of friction, which greatly reduces the friction between the two when it comes into contact with the damping winding 4. During motor operation, the rotor rotates at high speed, and the damping winding 4 will experience certain vibrations and slight displacements due to electromagnetic forces. The presence of the PTFE cotton cloth allows the damping winding 4 to perform these actions more smoothly, reducing energy loss caused by friction and improving the motor's operating efficiency.

[0031] Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A generator rotor winding wedge pad assembly structure, wherein the rotor comprises multiple rotor slots with equal circumferential distribution and rotor windings placed within the rotor slots, and the rotor winding of each rotor slot is positioned within the rotor slot by the wedge pad assembly structure, characterized in that: It includes a wedge pad, a damping winding, and a slot wedge arranged sequentially from bottom to top on the upper end of the rotor winding, wherein the slot wedge is engaged with the top opening of the rotor slot; The wedge-shaped pad includes a pad body and a sliding layer placed on the upper end face of the pad body. The center of the upper end face of the pad body has a through groove along its axial direction. The upper end face of the pad body has multiple arc-shaped grooves distributed along its axial direction at positions on both sides of the through groove. The bottom of each arc-shaped groove has a through hole to the bottom end face of the pad body. The opening of the arc-shaped groove faces the sliding layer. The arc-shaped grooves on both sides are staggered and arranged in sequence, and the through holes in the arc-shaped grooves on both sides are arranged in sequence. The sliding layer is in contact with the damping winding.

2. The generator rotor winding wedge pad assembly structure according to claim 1, characterized in that: The two ends of the through hole along its through groove extension direction are opposite arc surfaces, and the two corresponding through holes are arranged axially symmetrically.

3. The generator rotor winding wedge pad assembly structure according to claim 2, characterized in that: The spacing between the multiple arc-shaped grooves on each side is consistent, and the spacing between each pair of corresponding arc-shaped grooves is 15-25mm.

4. The generator rotor winding wedge pad assembly structure according to claim 3, characterized in that: The through slot has an isosceles trapezoidal shape, wider at the top and narrower at the bottom.

5. The generator rotor winding wedge pad assembly structure according to claim 4, characterized in that: The pad body has baffles on both radial sides to limit the damping winding, and the baffles have multiple ventilation holes.

6. The generator rotor winding wedge pad assembly structure according to claim 5, characterized in that: The slip layer is made of polytetrafluoroethylene cotton cloth, and the thickness of the slip layer is 2-3 mm.

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