Stator winding end portion fixing guard structure

Abstract

This utility model relates to the field of motor technology, specifically a stator winding end fixing and protection structure, including a housing, a stator housed inside the housing, and end protection components installed at both ends of the stator. Each end protection component includes a bottom ring, several arc-shaped pressure strips, and a plug-in sleeve, with a protective ring edge on the plug-in sleeve. This stator winding end fixing and protection structure, through the protective ring edges, effectively protects the edges of the stator winding ends, reducing damage to the winding ends caused by vibrations during motor operation and improving the protection effect. The end protection components at both ends of the stator compress the arc-shaped pressure strips against the inner wall of the housing, thus fixing the end protection components in place within the housing. The stator is then positioned between the two end protection components, reducing axial movement of the stator within the housing and improving motor operating stability.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a stator winding end fixing and protection structure. Background Technology

[0002] The stator winding is the core component of the motor, and its ends are the key parts for winding lead-out and connection, located in the complex environment inside the motor. During motor operation, the winding ends are affected by various forces such as electromagnetic force and thermal stress, and must also cope with vibration, temperature changes, and other conditions. Therefore, fixing and protecting them is an important part of ensuring stable motor operation, which is related to the motor's performance and service life.

[0003] Utility model patent CN210246443U discloses a motor winding end fixing device. This device includes several insulating plates and multiple end clamps bound to the insulating plates. The insulating plates are fixed circumferentially to the stator coil and extend parallel to the stator coil's axial direction. The multiple end clamps are arranged circumferentially at the ends of the stator windings, and the ends of the stator windings are bound to these end clamps. This motor winding end fixing device is used to fix the motor stator windings and provides good stability.

[0004] The current motor winding end fixing device mainly relies on end clamps and straps to fix the winding ends, lacking a dedicated protective structure. It provides insufficient protection for the edges and corners of the winding ends, making the coils susceptible to damage due to vibration and other factors. At the same time, the axial position of the stator within the housing is not effectively restricted, and the motor is prone to axial movement due to vibration during operation, affecting operational stability. In view of this, we propose a stator winding end fixing and protection structure. Utility Model Content

[0005] The purpose of this invention is to provide a fixed protective structure for the end of the stator winding to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A stator winding end-fixed protective structure includes a housing, within which a stator is housed. End-protective components are installed at both ends of the stator. Each end-protective component includes a bottom ring that fits against the stator ring end of the stator; several arc-shaped pressure strips fitted around the outer ring of the bottom ring and capable of pressing against the inner wall of the housing; and a plug-in sleeve fitted around the inner ring of the bottom ring and capable of protecting the winding ends of the stator. The outer surface of the bottom ring and the inner surface of the arc-shaped pressure strips are both conical. Several tightening bolts are threaded onto the bottom ring. The threaded portion of each tightening bolt passes through the arc-shaped pressure strip. By tightening the tightening bolts, the conical surface of the arc-shaped pressure strip can press against the conical surface of the bottom ring. Guided by the conical surface, the arc-shaped pressure strip moves radially outward, thereby pressing against the inner wall of the housing. A protective ring edge is provided at the inner edge of the top of the plug-in sleeve.

[0008] Preferably, the bottom ring has a plurality of threaded holes, the axial direction of the threaded holes is parallel to the axial direction of the bottom ring, and the clamping bolt is threadedly connected to the threaded holes;

[0009] This setting ensures that the force of the tightening bolt is transmitted axially along the bottom ring, avoiding eccentric force on the arc-shaped pressure strip and ensuring the stability of the arc-shaped pressure strip under force.

[0010] Preferably, a plurality of the arc-shaped pressure strips are arranged in a ring array around the bottom ring axis outside the bottom ring, and a through groove is formed on the arc-shaped pressure strip. The through groove is waist-shaped, and the threaded part of the clamping bolt passes through the through groove.

[0011] In this configuration, the ring array distribution ensures uniform stress on the inner wall of the casing, while the waist-shaped groove provides space for the radial movement of the arc-shaped pressure strip and restricts its swaying.

[0012] Preferably, the conical surface of the outer peripheral surface of the bottom ring is away from the stator, that is, the outer peripheral surface of the bottom ring gradually tapers from the side close to the stator to the side away from the stator, and the conical surface of the inner ring surface of the arc-shaped pressure strip is in contact with the conical surface of the outer peripheral surface of the bottom ring;

[0013] In this setting, the conical surface fit provides precise guidance for the radial movement of the arc-shaped pressure strip, ensuring consistent displacement of the arc-shaped pressure strip and achieving uniform extrusion of the inner wall of the housing.

[0014] Preferably, the outer end surface of the arc-shaped pressure strip is provided with several protruding abutting ridges. When the abutting bolt is tightened, the arc-shaped pressure strip abuts against the inner wall of the housing under the guidance of the inclined surface of the bottom ring.

[0015] In this design, the abutting ridge increases the friction between the curved pressure strip and the inner wall of the housing, preventing them from sliding relative to each other and improving the stability of the end guard.

[0016] Preferably, the bottom edge of the inner ring of the bottom ring is provided with an annular groove, and the bottom edge of the outer peripheral surface of the plug sleeve is provided with several protruding edges that can be inserted into the groove.

[0017] In this design, the cooperation between the slot and the edge of the card enables the quick assembly of the plug sleeve and the bottom ring, ensuring a tight connection between the two and preventing the plug sleeve from falling off.

[0018] Preferably, the outer peripheral surface of the plug sleeve is provided with a plurality of first through slots for heat dissipation, and the top surface of the protective ring edge is provided with a plurality of second through slots for heat dissipation.

[0019] In this configuration, the first and second through slots form an air circulation channel, which promotes the flow of air between the winding ends and the outside air and accelerates heat dissipation.

[0020] Preferably, the outer peripheral surface of the plug sleeve is provided with a plurality of first fins for enhancing heat dissipation, the positions of the first fins being offset from the positions of the first through groove, and the top surface of the protective ring edge is provided with a plurality of second fins for enhancing heat dissipation, the positions of the second fins being offset from the positions of the second through groove.

[0021] In this design, the first and second fins increase the contact area with the air and are staggered from the through slots to avoid obstructing airflow, further improving heat dissipation efficiency.

[0022] Compared with the prior art, the beneficial effects of this utility model are:

[0023] 1. The stator winding end fixed protection structure, through the set protective ring edge, can effectively protect the edge of the stator winding end, reduce the damage to the winding end caused by factors such as vibration during motor operation, and improve the protection effect;

[0024] 2. The stator winding end fixing protection structure uses end protection pieces set at both ends of the stator to compress the arc-shaped pressure strip against the inner wall of the housing, thereby fixing the position of the end protection pieces in the housing. At this time, the stator is positioned between the two end protection pieces, which can reduce the axial movement of the stator in the housing and improve the stability of motor operation. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 This is an exploded view of the end protection component of this utility model;

[0027] Figure 3 This is a partial structural cross-sectional view of the end guard component of this utility model;

[0028] Figure 4 This is a partial structural diagram of the bottom ring of this utility model;

[0029] Figure 5 This is a schematic diagram of the arc-shaped pressure strip in this utility model;

[0030] Figure 6 This is a partial structural diagram of the plug-in sleeve in this utility model;

[0031] The meanings of the labels in the diagram are as follows:

[0032] 100. Housing;

[0033] 200. Stator;

[0034] 300. End guard; 310. Bottom ring; 311. Threaded hole; 312. Slot; 320. Arc-shaped pressure strip; 321. Through groove; 322. Abutting protrusion; 330. Insert sleeve; 331. Protective ring edge; 332. Clamping edge; 333. First through groove; 334. Second through groove; 335. First fin; 336. Second fin; 340. Tightening bolt. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] Example 1

[0037] Please see Figures 1-6 The stator winding end fixed protection structure includes a housing 100, a stator 200 is housed inside the housing 100, and end protection components 300 are installed at both ends of the stator 200. The end protection component 300 includes a bottom ring 310 that fits against the end of the stator iron ring of the stator 200, several arc-shaped pressure strips 320 that are fitted on the outer ring of the bottom ring 310 and can compress the inner wall of the housing 100, and a plug-in sleeve 330 that is fitted on the inner ring of the bottom ring 310 and can protect the winding end of the stator 200. The bottom ring 310 is made of high-strength insulating plastic, which ensures that it is not easily deformed during assembly and use, can stably bear the force of each component, and has good insulation performance, which can prevent electrical connection with the winding end of the stator 200.

[0038] like Figures 2-5 As shown, in this invention, the outer surface of the bottom ring 310 and the inner surface of the arc-shaped pressure strip 320 are both conical. The conical direction of the outer circumferential surface of the bottom ring 310 is away from the stator 200, that is, the outer circumferential surface of the bottom ring 310 gradually narrows from the side close to the stator 200 to the side away from the stator 200. The conical surface of the inner circumferential surface of the arc-shaped pressure strip 320 fits into the conical surface of the outer circumferential surface of the bottom ring 310. This conical fit structure ensures that when the arc-shaped pressure strip 320 is compressed, its movement direction is strictly limited to the radial direction, without deviation or jamming. It can move stably in the radial direction, providing precise guidance for the subsequent uniform extrusion of the inner wall of the housing 100, and ensuring that the displacement of each arc-shaped pressure strip 320 is consistent.

[0039] like Figure 4 As shown, specifically, the bottom ring 310 is threaded with several tightening bolts 340, and the bottom ring 310 is provided with several threaded holes 311. The axial direction of the threaded holes 311 is parallel to the axial direction of the bottom ring 310. The tightening bolts 340 are threadedly connected to the threaded holes 311. The parallel axial design ensures that during the tightening process, the force applied by the tightening bolts 340 is completely transmitted to the arc-shaped pressure strip 320 along the axial direction of the bottom ring 310, and will not generate lateral or oblique eccentric force on the arc-shaped pressure strip 320, thus avoiding the arc-shaped pressure strip 320 from becoming skewed or damaged due to uneven force.

[0040] like Figure 2 , Figure 3 and Figure 5 As shown, furthermore, several arc-shaped pressure strips 320 are arranged in a circular array around the axis of the bottom ring 310 outside the bottom ring 310. The arc-shaped pressure strips 320 are made of wear-resistant metal material with a surface hardness of HRC30-35, and have good wear resistance and deformation resistance. A through groove 321 is provided on the arc-shaped pressure strip 320. The through groove 321 is waist-shaped. The threaded part of the clamping bolt 340 passes through the through groove 321, so that the threaded part of the clamping bolt 340 passes through the arc-shaped pressure strip 320. By tightening the clamping bolt 340, the conical surface of the arc-shaped pressure strip 320 can be made to face the conical surface of the bottom ring 310. During the compression process, the arc-shaped pressure strip 320 moves radially outward under the guidance of the conical surface, thereby compressing the inner wall of the housing 100. The circular array of arc-shaped pressure strips 320 ensures that the stress points on the inner wall of the housing 100 are evenly distributed on the same circumference, preventing excessive local stress and deformation of the housing 100. The length of the waist-shaped groove 321 matches the maximum radial movement distance of the arc-shaped pressure strip 320, providing sufficient space for the radial movement of the arc-shaped pressure strip 320. At the same time, the width of the groove 321 is slightly larger than the diameter of the threaded rod of the tightening bolt 340, ensuring that the threaded rod can pass through smoothly without causing excessive shaking of the arc-shaped pressure strip 320.

[0041] like Figure 2 and Figure 5As shown, the outer end surface of the arc-shaped pressure strip 320 is provided with several protruding abutment ridges 322. When the clamping bolt 340 is tightened, the arc-shaped pressure strip 320 abuts against the inner wall of the housing 100 under the guidance of the inclined surface of the bottom ring 310. The height of the abutment ridges 322 is 0.5-1mm, which can increase the contact friction between the arc-shaped pressure strip 320 and the inner wall of the housing 100. When the motor vibrates during operation, it can effectively prevent relative sliding between the arc-shaped pressure strip 320 and the inner wall of the housing 100, further improving the stability of the end protection component 300.

[0042] like Figure 2 , Figure 3 and Figure 6 As shown, it is worth noting that a protective ring edge 331 is provided on the inner edge of the top of the plug sleeve 330. The plug sleeve 330 is made of high-temperature resistant insulating material and can withstand temperatures above 150℃, adapting to the high-temperature environment during motor operation. A ring-shaped groove 312 is provided at the bottom edge of the inner ring of the bottom ring 310, and several protruding retaining edges 332 are provided at the bottom edge of the outer circumference of the plug sleeve 330. The retaining edges 332 can be inserted into the groove 312. The width of the protective ring edge 331 is 3-5mm, which can completely cover the edge and corner of the stator 200 winding end, providing comprehensive protection for these vulnerable parts and preventing friction and collision between the winding end and other components. The groove 312 and the retaining edge 332 adopt an interference fit with a tolerance of 0.02-0.05mm, which can realize the quick assembly of the plug sleeve 330 and the bottom ring 310, and ensure the tightness of the connection between the two, preventing the plug sleeve 330 from falling off during use.

[0043] In this embodiment, the stator winding end fixing protection structure is used by first installing the plug sleeve 330 into the inner ring of the bottom ring 310 through the cooperation of the retaining edge 332 and the retaining groove 312. During installation, a certain pressure needs to be applied to ensure that the retaining edge 332 smoothly enters the retaining groove 312, ensuring that the edge of the protective ring 331 accurately covers the edge of the stator 200 winding end. Then, the bottom ring 310 with the plug sleeve 330 is fitted against the end of the stator ring of the stator 200, ensuring that the bottom ring 310 is in complete contact with the end of the stator ring. Then, the arc-shaped pressure strip 320 is fitted onto the outer ring of the bottom ring 310, so that the tightening bolt 340 passes through the through groove 321 and engages with the thread. Connect the hole 311. At this time, it is important to ensure that the conical surface of the arc-shaped pressure strip 320 is completely in contact with the conical surface of the bottom ring 310. Next, place the stator 200 with the end guards 300 assembled into the housing 100. Adjust the position of the stator 200 to ensure that the end guards 300 at both ends are located at the beginning and end of the stator 200 and are equidistant from the ends of the housing 100. Finally, tighten the clamping bolts 340. During the tightening process, apply force evenly to make the arc-shaped pressure strip 320 move radially outward and evenly press against the inner wall of the housing 100 until the arc-shaped pressure strip 320 can no longer move, thus completing the fixing and protection of the stator 200.

[0044] Example 2

[0045] To prevent the end guard 300 from covering the winding ends of the stator 200 and affecting heat dissipation, such as Figures 1-3 and Figure 6 As shown, the outer peripheral surface of the plug sleeve 330 is provided with several first through grooves 333 for heat dissipation, and the top surface of the protective ring edge 331 is provided with several second through grooves 334 for heat dissipation. The length of the first through grooves 333 is 5-8mm and the width is 2-3mm. They are evenly distributed on the outer peripheral surface of the plug sleeve 330. The size of the second through grooves 334 is the same as that of the first through grooves 333. They are distributed on the top surface of the protective ring edge 331. The two cooperate with each other to form a complete air circulation channel, promote the rapid circulation between the winding end and the outside air, accelerate heat dissipation, and reduce the temperature of the winding end.

[0046] Furthermore, the outer peripheral surface of the plug sleeve 330 is provided with a plurality of first fins 335 for enhancing heat dissipation. The positions of the first fins 335 are staggered from the positions of the first through slots 333. The top surface of the protective ring edge 331 is provided with a plurality of second fins 336 for enhancing heat dissipation. The positions of the second fins 336 are staggered from the positions of the second through slots 334. The height of the first fins 335 and the second fins 336 is 2-3mm, and the thickness is 1-1.5mm. They are made of the same material as the plug sleeve 330 and are integrally formed with the plug sleeve 330. They increase the contact area between the plug sleeve 330 and the air by 30%-40% compared with the case without fins. Moreover, their staggered distribution with the through slots avoids blocking the airflow path, further improving the heat dissipation efficiency.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. 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 preferred examples and are not intended to limit the 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 stator winding end fixing protection structure, comprising a machine shell (100), a stator (200) is sleeved in the machine shell (100), characterized in that: Both ends of the stator (200) are equipped with end protectors (300). The end protectors (300) include a bottom ring (310) that fits against the end of the stator ring of the stator (200), a plurality of arc-shaped pressure strips (320) that are fitted on the outer ring of the bottom ring (310) and can press against the inner wall of the housing (100), and a plug sleeve (330) that is fitted on the inner ring of the bottom ring (310) and can protect the winding end of the stator (200). The outer ring surface of the bottom ring (310) and the arc-shaped pressure strips (320) are also protected. The inner ring surface is conical. Several clamping bolts (340) are threaded on the bottom ring (310). The threaded part of the clamping bolt (340) passes through the arc-shaped pressure strip (320). By tightening the clamping bolt (340), the conical surface of the arc-shaped pressure strip (320) can be squeezed towards the conical surface of the bottom ring (310). The arc-shaped pressure strip (320) moves radially outward under the guidance of the conical surface, thereby squeezing the inner wall of the housing (100). A protective ring edge (331) is provided at the inner edge of the top of the plug sleeve (330).

2. The stator winding end fixing protection structure according to claim 1, characterized in that: The bottom ring (310) has a plurality of threaded holes (311), the axial direction of the threaded holes (311) is parallel to the axial direction of the bottom ring (310), and the clamping bolt (340) is threadedly connected to the threaded holes (311).

3. A stator winding end fixing guard structure according to claim 2, characterised in that: Several of the arc-shaped pressure strips (320) are arranged in a ring array outside the bottom ring (310) with the axis of the bottom ring (310) as the center. A through groove (321) is provided on the arc-shaped pressure strip (320). The through groove (321) is waist-shaped. The threaded part of the clamping bolt (340) passes through the through groove (321).

4. The stator winding end turn fixation guard structure of claim 1, wherein: The conical surface of the outer peripheral surface of the bottom ring (310) is away from the stator (200), that is, the outer peripheral surface of the bottom ring (310) gradually narrows from the side close to the stator (200) to the side away from the stator (200), and the conical surface of the inner ring surface of the arc-shaped pressure strip (320) is in contact with the conical surface of the outer peripheral surface of the bottom ring (310).

5. The stator winding end turn fixation guard structure of claim 1, wherein: The outer end surface of the arc-shaped pressure strip (320) is provided with several protruding abutment ridges (322). When the abutment bolt (340) is tightened, the arc-shaped pressure strip (320) abuts against the inner wall of the housing (100) under the guidance of the inclined surface of the bottom ring (310).

6. The stator winding end turn fixation guard structure of claim 1, wherein: The bottom edge of the inner ring of the bottom ring (310) is provided with a ring-shaped groove (312), and the bottom edge of the outer surface of the plug sleeve (330) is provided with several protruding edges (332), which can be inserted into the groove (312).

7. The stator winding end fixing protection structure according to claim 1, characterized in that: The outer peripheral surface of the plug sleeve (330) is provided with a plurality of first through slots (333) for heat dissipation, and the top surface of the protective ring edge (331) is provided with a plurality of second through slots (334) for heat dissipation.

8. A stator winding end fixing guard structure according to claim 7, characterised in that: The outer peripheral surface of the plug sleeve (330) is provided with a plurality of first fins (335) for enhancing heat dissipation. The positions of the first fins (335) are offset from the positions of the first through groove (333). The top surface of the protective ring edge (331) is provided with a plurality of second fins (336) for enhancing heat dissipation. The positions of the second fins (336) are offset from the positions of the second through groove (334).

Images