A motor stator hot-jacketing auxiliary device, a motor stator and a motor

Abstract

The application provides a motor stator hot-jacketing auxiliary device, a motor stator and a motor. The motor stator hot-jacketing auxiliary device comprises a shell member, a first limiting member and a second limiting member. The shell member has a receiving cavity for accommodating at least a part of the motor stator, and the radial dimension of the receiving cavity is greater than the radial dimension of the stator lamination set of the motor stator. The first limiting member is arranged at one end of the shell member to restrict the circumferential displacement and the radial displacement of the stator lamination set relative to the shell member. The second limiting member is detachably arranged at the other end of the shell member, and the second limiting member cooperates with the shell member to form space limiting of the stator lamination set. The shell member with an inner diameter greater than the outer diameter of the stator lamination is arranged, and the two end faces of the shell member are provided with teeth for fixing the stator, which are the same as the tooth structure of the stator. When hot-jacketing, the interference fit mainly occurs between the stator and the shell member, which greatly reduces the deformation of the stator lamination and reduces the risk of abnormal noise caused by deformation.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to an auxiliary device for heat-shrinking a motor stator, a motor stator, and a motor. Background Technology

[0002] A permanent magnet synchronous motor mainly consists of a stator and a rotor. The stator is primarily fixed to the housing using a heat-shrink fitting process, while the rotor is rigidly connected to the shaft. During motor operation, the electromagnetic forces acting on the motor are mainly radial and tangential, with the axial electromagnetic force having a relatively small impact. Under the heat-shrink fitting process, the inner surface of the housing forms an interference fit with the outer surface of the stator, inevitably leading to a certain degree of stator deformation. Under the excitation of electromagnetic forces, this deformation causes distortion in the radial air gap and tangential magnetic field distribution during motor operation, making it easier to induce electromagnetic noise and excite the motor's own structural modes.

[0003] To optimize this deformation, the main approach currently is to optimize the heat-shrinking equipment and process parameters to make the stator heat up more evenly and be stressed more evenly during the heat-shrinking process. However, this optimization method can only make the deformation distribution more uniform, but cannot fundamentally eliminate the radial and tangential deformation of the stator laminations.

[0004] like Figure 1 As shown, patent CN212683643U provides a stator fastening device for a semi-hermetic compressor motor. This device achieves axial fixation of the stator by providing keyways on the housing and motor stator and utilizing the interaction between the set screw and the key. However, this device has limited applicability and cannot be used in some enclosed machines. Furthermore, the method of creating keyways on the outside of the stator and tightening the key with screws causes particularly significant deformation of the motor laminations in the vicinity of the keyways.

[0005] like Figure 2 As shown, patent JP2008086172A provides a matching heat-shrinking ring for a segmented motor stator. This heat-shrinking ring is arranged on the outside of the stator, and its main function is to connect the multiple iron core yokes into a single unit. However, the inner ring of this heat-shrinking ring inevitably comes into contact with the outside of the stator. Even before the heat-shrinking process, a pre-tightening force needs to be applied between adjacent segments to ensure that the segmented stator does not loosen. This results in the tightening force on the heat-shrinking ring acting directly radially on the stator laminations after heat-shrinking, and the problem of radial and tangential deformation of the laminations still cannot be effectively improved.

[0006] The applicant has discovered that the existing technology has at least the following technical problems: the existing heat-shrinking process and auxiliary devices cannot effectively isolate the fastening force generated by the heat-shrinking interference fit from the direct action path between the stator laminations, resulting in unacceptable deformation of the stator laminations in the radial and tangential directions, which in turn induces electromagnetic noise and affects the reliability of motor operation. Summary of the Invention

[0007] The purpose of this invention is to provide an auxiliary device for heat fitting of a motor stator, a motor stator, and a motor, so as to solve the technical problem in the prior art where the stator laminations undergo radial and tangential deformation due to direct interference fit force during the heat fitting process, which leads to increased electromagnetic noise.

[0008] To achieve the above objectives, the present invention provides the following technical solution: The present invention provides an auxiliary device for heat-shrinking a motor stator, comprising a housing component, a first limiting component, and a second limiting component. The housing component has a receiving cavity configured to accommodate at least a portion of the motor stator, and the radial dimension of the receiving cavity is configured to be larger than the radial dimension of the stator lamination assembly. The first limiting component is disposed at one end of the housing component to constrain the circumferential and radial displacement of the stator lamination assembly relative to the housing component. The second limiting component is detachably disposed at the other end of the housing component, and the second limiting component cooperates with the housing component to spatially limit the stator lamination assembly.

[0009] By setting a housing component with a radial dimension larger than the outer diameter of the stator lamination assembly outside the stator lamination assembly, the fastening force generated by the interference fit during the heat fitting process mainly acts between the outer peripheral surface of the housing component and the motor housing. The stator lamination assembly, due to the radial clearance between it and the inner wall of the housing component, is almost entirely unaffected by direct radial loads, fundamentally avoiding radial and tangential deformation of the stator laminations caused by the heat fitting interference fit. Simultaneously, the first and second limiting components spatially limit the stator lamination assembly, ensuring its positional stability and coaxiality within the housing component.

[0010] Based on the above technical solution, the present invention can be further improved as follows.

[0011] Furthermore, the first limiting member and the shell member are integrally formed or fixedly connected.

[0012] The one-piece molding structure can eliminate the connection gaps and cumulative tolerances required for separate assembly, significantly improve the relative positional accuracy and connection strength between the first limiting component and the housing component, and ensure the alignment accuracy between the first tooth and the stator lamination group teeth; the fixed connection structure can simplify the processing technology and reduce manufacturing costs while ensuring connection strength, and has good process adaptability and economy.

[0013] Furthermore, one end of the housing component is provided with an annular limiting portion extending radially inward, the annular limiting portion having an inner edge, the channel dimension defined by the inner edge being smaller than the radial dimension of the stator lamination assembly, and the first limiting component being disposed on the annular limiting portion.

[0014] As a ring-shaped solid structure protruding radially inward from the shell member cylinder wall, the annular limiting part provides a structural bearing base for the first limiting member, enabling the first tooth to be stably mounted on it. On the other hand, the channel dimension defined by the inner edge of the annular limiting part is smaller than the radial dimension of the stator lamination assembly, so that the stator lamination assembly cannot be dislodged from this end after being installed in the receiving cavity. It achieves the axial limiting function of the stator lamination assembly in an extremely simple structural form without the need for additional fasteners or connecting structures.

[0015] Furthermore, the first limiting member includes a plurality of first teeth evenly arranged circumferentially along the annular limiting portion, and the number, circumferential position and contour size of the first teeth correspond one-to-one with the tooth structure of the stator lamination group.

[0016] With this configuration, the mating relationship between the first tooth and the stator lamination assembly teeth can simultaneously create motion constraints in both the circumferential and radial dimensions, thereby achieving precise positioning. Since the first tooth and the stator teeth are complementary in shape, the degrees of freedom of the stator lamination assembly relative to the housing component in both the circumferential and radial directions are completely restricted after they are mated.

[0017] Furthermore, a first positioning hole is provided on the first tooth, which is configured to cooperate with the positioning structure on the stator lamination tooth.

[0018] The first positioning hole forms a secondary positioning fit with the existing positioning structure (such as positioning hole or positioning post) on the teeth of the stator lamination assembly. Based on the coarse positioning provided by the tooth engagement, the positioning accuracy is further improved, ensuring that the coaxiality between the stator lamination assembly and the housing components meets the stringent requirements of motor assembly, and avoiding uneven air gap and deterioration of electromagnetic performance caused by assembly offset.

[0019] Furthermore, the second limiting structure includes several protruding rings and a collar cover. All the protruding rings are spaced apart along the circumference of the housing component to form a snap-fit ​​interface between adjacent protruding rings. The channel size defined by the inner ring of the protruding ring is larger than the radial dimension of the stator lamination assembly. The collar cover is provided with a snap-fit ​​portion. The snap-fit ​​portion is adapted to the position of the snap-fit ​​interface. After the snap-fit ​​portion passes through the snap-fit ​​interface, it rotates to the bottom of the protruding ring to snap into the housing component. With this configuration, the collar cover achieves a detachable connection with the housing component through the cooperation of the snap-fit ​​portion and the snap-fit ​​interface. During assembly, the snap-fit ​​portion is aligned with the snap-fit ​​interface and pressed down to pass through the snap-fit ​​interface. Then, rotating it at a certain angle will make the snap-fit ​​portion engage with the bottom of the protruding ring. The operation is convenient and the connection is reliable.

[0020] The collar cover can be detachably connected to the housing components without the need for bolts, screws, or other independent fasteners through a rotating locking structure between the convex ring and the snap-fit ​​part. During assembly, simply align the snap-fit ​​part with the snap-fit ​​interface, press down, and rotate to lock. Disassembly involves rotating in the opposite direction to release the lock. The entire assembly and disassembly process requires no special tools, making it extremely convenient. Furthermore, the channel dimension defined by the inner ring of the convex ring is larger than the radial dimension of the stator lamination assembly, ensuring that the stator lamination assembly can pass through the channel unimpeded during assembly without any assembly interference caused by the convex ring structure.

[0021] Furthermore, the collar cover has a circular annular structure, with a plurality of second teeth evenly arranged along the circumferential direction on the inner ring. The number, circumferential position, and contour dimensions of the second teeth correspond one-to-one with the tooth structure of the stator lamination assembly. This arrangement allows the second teeth to engage with the upper teeth of the stator lamination assembly, further enhancing the constraint on the stator lamination assembly in both the circumferential and radial dimensions.

[0022] The second toothed part forms a fitting engagement with the upper toothed part of the stator lamination assembly. Together with the first limiting component, it provides circumferential and radial positioning constraints to both ends of the stator lamination assembly. The stator lamination assembly is completely positioned inside the housing component, preventing circumferential rotation and radial movement, thus ensuring the uniformity and stability of the air gap between the stator and rotor during motor operation.

[0023] Furthermore, a second positioning hole is provided on the second tooth, which is configured to cooperate with the positioning structure on the stator lamination tooth.

[0024] The second positioning hole forms a secondary positioning fit with the existing positioning structure at the upper end of the stator lamination teeth, enabling the upper end of the stator lamination to achieve higher positioning accuracy based on the tooth engagement, and ensuring the coaxiality of the stator lamination at both ends in the axial direction.

[0025] Furthermore, the first limiting member and / or the second limiting member are provided with a plurality of flow holes, which are distributed circumferentially to form flow channels for cooling medium or gas. This arrangement allows the flow holes to provide a flow path for media such as cooling oil during motor operation, improving the problem of cooling oil deposition inside the motor and optimizing the oil content. Simultaneously, during the heat fitting process, the flow holes can also serve as gas discharge channels, preventing assembly defects caused by gas stagnation.

[0026] The presence of flow holes allows this device to not only isolate heat-shrink deformation and position the stator, but also facilitate the flow of cooling medium and the discharge of gas. During motor operation, cooling oil can circulate within the motor through the flow holes, preventing oil deposition in the upper cavity and improving the motor's oil content and heat dissipation performance. During heat-shrinking, gas within the containment cavity can be discharged through the flow holes, preventing assembly defects caused by gas thermal expansion and stagnation.

[0027] Furthermore, the outer peripheral surface of the housing component is configured to form an interference fit with the inner peripheral surface of the motor housing.

[0028] The outer circumferential surface of the housing component serves as the direct force-bearing surface of the thermal interference fit. This mating surface bears all the fastening force between the motor housing and the housing component, ensuring the connection strength and reliability between the motor housing and the housing component. Meanwhile, the stator laminations are completely exempt from force due to the gap between them and the inner wall of the housing component, thus achieving physical isolation between the thermal fastening force and the stator laminations.

[0029] The motor stator provided by the present invention includes a stator lamination assembly and a motor stator heat-shrinking auxiliary device as described above. The stator lamination assembly is housed in the receiving cavity of the housing component, and the first limiting member and the second limiting member respectively limit the stator lamination assembly from both axial ends.

[0030] The motor stator of the present invention with the above-mentioned auxiliary device does not bear radial fastening force during the heat fitting process of the stator lamination assembly. The laminations maintain their original geometric accuracy and shape. The assembled motor stator has excellent coaxiality and uniform air gap, thus eliminating the electromagnetic noise excitation source caused by lamination deformation from the root.

[0031] The motor provided by the present invention includes a motor housing and a motor stator as described above, wherein the motor housing is interference-fitted with the outer peripheral surface of the housing component.

[0032] The present invention provides a motor with the above-mentioned stator, in which the heat-shrink deformation is limited to the housing component, the electromagnetic performance of the stator lamination is not affected by the heat-shrink process, the electromagnetic noise during motor operation is significantly reduced, and the service life and operational reliability of the motor are effectively improved because the stator lamination does not deform. Attached Figure Description

[0033] 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, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1This is a schematic diagram of the stator fastening device in the prior art; Figure 2 This is a schematic diagram of the structure of a modular motor stator in the prior art; Figure 3 This is a schematic diagram of the stator structure in the prior art; Figure 4 This is a front sectional view of the stator structure with the stator heat-shrink auxiliary device of the present invention; Figure 5 This is a three-dimensional structural schematic diagram of the first limiting component in the auxiliary device for heat-shrinking the motor stator of the present invention; Figure 6 This is a schematic diagram of the structure of the second limiting component in the auxiliary device for heat-shrinking the motor stator of the present invention; Figure 7 This is a side view of a motor stator with the motor stator heat-shrink auxiliary device of the present invention.

[0035] In the picture: 1. Insulating groove paper; 2. Upper skeleton; 3. Windings; 4. Stator lamination assembly; 5. Lower skeleton; 10. Shell components; 11. Receiving cavity; 12. Annular limiting part; 13. First limiting component; 131. First tooth; 132. First positioning hole; 14. Flow hole; 15. Second limiting component; 151. Second tooth; 152. Second positioning hole; 153. Connecting part; 154. Card interface. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0037] like Figure 1As shown, in the prior art, the motor stator includes insulating slot paper 1, upper frame 2, winding 3, stator lamination group 4 and lower frame 5. Conventional heat fitting fixes the motor stator lamination group 4 inside the housing, and the outer side of the stator lamination group 4 is interference-fitted with the housing. This method will cause the stator lamination group 4 to undergo radial and tangential deformation. Under electromagnetic force excitation, such radial and tangential deformation can easily lead to abnormal and unacceptable noise.

[0038] Example 1:

[0039] To address the aforementioned problems, this invention provides an auxiliary device for heat-shrinking a motor stator. In addition to the existing motor structure, a housing component with an inner diameter larger than the outer diameter of the stator laminations is incorporated. Both ends of the housing component have toothed structures identical to the stator toothed structures for stator fixation. This design, on the one hand, ensures that the interference fit during heat-shrinking primarily occurs between the stator and the housing component, significantly reducing stator lamination deformation and lowering the risk of abnormal noise due to deformation. On the other hand, the stator-like toothed structures at both ends of the housing component ensure that the stator is fixed not only axially but also radially and tangentially, making it less prone to changes in the coaxiality of the stator and rotor.

[0040] Specifically, such as Figures 3 to 7 As shown, the present invention provides an auxiliary device for heat fitting of motor stator, including a housing component 10, a first limiting component 13 and a second limiting component 15.

[0041] The housing member 10 is generally cylindrical, with an internal cavity 11. This cavity 11 is configured to house at least a portion of the motor stator; specifically, the stator lamination assembly 4 is housed within the cavity 11. The radial dimension of the cavity 11 (i.e., the inner diameter of the housing member 10) is configured to be larger than the outer diameter of the stator lamination assembly 4. This means that when the stator lamination assembly 4 is placed within the cavity 11, a radial gap exists between the outer circumferential surface of the stator lamination assembly 4 and the inner circumferential surface of the housing member 10. This gap prevents the radial clamping force borne by the housing member 10 during heat fitting from being directly transmitted to the stator lamination assembly 4.

[0042] The outer peripheral surface of the housing component 10 is configured to form an interference fit with the inner peripheral surface of the motor housing. During heat fitting, the motor housing expands due to heat and fits onto the outer periphery of the housing component 10; after cooling and shrinking, the two form an interference fit.

[0043] The first limiting member 13 is disposed at one end of the shell member 10 (e.g., Figure 4 and Figure 5(See the lower end shown). In this embodiment, the first limiting member 13 and the shell member 10 are integrally formed, that is, they are formed into a single component by casting, machining, or other means. It is understood that in other embodiments, the first limiting member 13 and the shell member 10 can also be formed into a single unit by bolt connection, welding, or other fixed connection methods.

[0044] like Figure 4 and Figure 5 As shown, one end of the housing member 10 is provided with an annular limiting portion 12 extending radially inward. The annular limiting portion 12 has an inner edge, the channel dimension defined by the inner edge being smaller than the radial dimension of the stator lamination group 4, thereby preventing the stator lamination group 4 from dislodging from this end and realizing the axial limiting function. A first limiting member 13 is provided on the annular limiting portion 12. Specifically, the first limiting member 13 includes a plurality of first teeth 131 uniformly arranged circumferentially along the annular limiting portion 12, and the number, circumferential position, and contour dimension of the first teeth 131 correspond one-to-one with the tooth structure of the stator lamination group 4.

[0045] When the stator lamination assembly 4 is placed into the receiving cavity 11, the teeth at its lower end engage with the corresponding first teeth 131, thereby creating positioning constraints in both the circumferential and radial directions. The first teeth 131 are provided with first positioning holes 132, which are configured to engage with positioning structures (such as positioning holes or positioning posts) on the teeth of the stator lamination assembly 4. In actual stator structures, the teeth of the stator lamination assembly 4 typically have positioning structures for engaging with the upper frame 2 and lower frame 5. The position and size of the first positioning holes 132 correspond to these existing positioning structures, thus enabling precise alignment using the stator's own positioning features.

[0046] The second limiting member 15 is detachably disposed at the other end of the housing member 10 (e.g., Figure 4 (See upper end shown). In this embodiment, the second limiting member 15 includes a plurality of protruding rings and a collar cover. The protruding rings are disposed at the upper end of the housing member 10 and are spaced apart along the circumferential direction of the housing member 10, with a snap-fit ​​interface 121 formed between two adjacent protruding rings. The channel dimension defined by the inner ring of the protruding ring is larger than the radial dimension of the stator lamination group 4 so that the stator lamination group 4 can pass through the channel.

[0047] The number of card interfaces 121 is greater than or equal to 2. These card interfaces 121 are configured to form a detachable engaging engagement with the card contacts 153 of the second limiting member 15.

[0048] The collar cover has an overall annular structure, and its outer diameter is basically the same as the inner diameter of the housing component 10. Several snap-fit ​​portions 153 are provided circumferentially around the outer periphery of the collar cover. The number and size of the snap-fit ​​portions 153 correspond to the number and size of the snap-fit ​​interfaces 121. During assembly, the snap-fit ​​portions 153 of the collar cover are aligned with the snap-fit ​​interfaces 121 and pressed down, allowing the snap-fit ​​portions 153 to pass through the snap-fit ​​interfaces 121. Then, by rotating a certain angle, the snap-fit ​​portions 153 engage with the bottom of the protruding ring, thereby fixing the collar cover to the upper end of the housing component 10. This engagement method makes the installation and removal of the collar cover very convenient.

[0049] The inner ring of the collar cover is evenly provided with a number of second teeth 151 along the circumferential direction. The number, circumferential position and outline size of the second teeth 151 correspond one-to-one with the tooth structure of the stator lamination group 4. The second teeth 151 are provided with second positioning holes 152, which are also configured to cooperate with the positioning structure on the teeth of the stator lamination group 4.

[0050] The first limiting member 13 and the second limiting member 15 respectively limit the stator lamination group 4 from both ends of the axial direction. The first limiting member 13 supports and positions the stator lamination group 4 from the lower end, and the second limiting member 15 positions and presses the stator lamination group 4 from the upper end. Together, they achieve complete constraint on the stator lamination group 4 in space.

[0051] In addition, the first limiting member 13 and / or the second limiting member 15 are provided with a plurality of flow holes 14. Figure 5 and Figure 6 As shown, the flow holes 14 are distributed circumferentially, and their specific form is not limited to round holes. Rectangular holes, waist-shaped holes or other irregular structures can also be used.

[0052] The function of the flow hole 14 is to provide a flow path for cooling medium such as cooling oil during motor operation, prevent cooling oil from depositing in the upper cavity of the motor, and improve the oil content of the motor; at the same time, during the heat fitting process, the flow hole 14 can also serve as a gas discharge channel to avoid assembly defects caused by gas retention.

[0053] The working principle of the motor stator heat-shrink auxiliary device of the present invention is as follows: First, the stator lamination assembly 4 is placed into the receiving cavity 11 of the housing component 10, so that the teeth at the lower end of the stator lamination assembly 4 respectively engage with the first teeth 131 on the first limiting component 13, and at the same time, the first positioning hole 132 is aligned and engaged with the positioning structure on the teeth of the stator lamination assembly 4. At this time, the stator lamination assembly 4 is constrained by the first limiting component 13 in both the circumferential and radial directions.

[0054] Then, the collar cover is placed on the upper end of the housing component 10 from above. The snap-fit ​​portion 153 of the collar cover is aligned with the snap-fit ​​interface 121, pressed down, and rotated to engage the snap-fit ​​portion 153 with the bottom of the protruding ring. This causes the second tooth 151 to engage with the tooth at the upper end of the stator lamination assembly 4, while simultaneously aligning the second positioning hole 152 with the positioning structure on the tooth of the stator lamination assembly 4. At this point, the collar cover positions and presses down the stator lamination assembly 4 from above, forming an axial limit on the stator lamination assembly 4 together with the first limiting component 13.

[0055] At this point, the stator lamination assembly 4 is completely constrained within the receiving space formed by the housing member 10, the first limiting member 13, and the second limiting member 15. Since the inner diameter of the housing member 10 is larger than the outer diameter of the stator lamination assembly 4, there is a radial gap between the outer circumferential surface of the stator lamination assembly 4 and the inner circumferential surface of the housing member 10, and the stator lamination assembly 4 is not subjected to direct radial force from the housing member 10.

[0056] After the stator lamination group 4 is assembled, the upper frame 2, lower frame 5 and insulating groove paper 1 are assembled, and then the wires are wound to form the winding 3, thus forming a complete stator structure with auxiliary devices.

[0057] Finally, the entire stator structure with auxiliary devices is subjected to a heat fitting process. During heat fitting, the motor housing is heated to expand it, and then the stator structure with auxiliary devices is pushed into a predetermined position inside the motor housing. After the motor housing cools and shrinks, the inner circumferential surface of the motor housing and the outer circumferential surface of the housing component 10 form an interference fit.

[0058] Because the clamping force generated by the interference fit mainly acts between the motor housing and the housing component 10, and there is a gap between the inner wall of the housing component 10 and the outer peripheral surface of the stator lamination assembly 4, this clamping force is not directly transmitted to the stator lamination assembly 4. Therefore, the deformation caused by heat fitting is mainly concentrated on the housing component 10, while the stator lamination assembly 4 hardly undergoes radial or tangential deformation. This fundamentally solves the technical problem in traditional heat fitting processes where the stator laminations deform due to directly bearing the interference fit force, leading to increased electromagnetic noise.

[0059] Example 2:

[0060] like Figure 5 and Figure 6 As shown, the flow hole 14 can be provided on the first limiting member 13 (e.g., Figure 5 (As shown), it can also be set on the second limiting member 15 (such as Figure 6(As shown), or both can be provided simultaneously. The specific number, diameter, and distribution of the flow holes 14 can be adjusted according to actual needs. Generally, the diameter and position of the flow holes 14 need to be determined based on the external dimensions of the stator lamination group 4 to ensure smooth flow of the cooling medium.

[0061] Example 3:

[0062] In addition to the aforementioned method of engaging the snap-fit ​​part 153 with the snap-fit ​​interface 121, the second limiting member 15 and the housing member 10 can also be connected by other detachable methods such as threaded connection or bolt connection. As long as the second limiting member 15 can be detachably fixed on the housing member 10 and can effectively limit the axial movement of the stator lamination group 4, it falls within the protection scope of this invention.

[0063] Example 4:

[0064] like Figure 7 As shown, the present invention also provides a motor stator, including a stator lamination assembly 4 and a motor stator heat-shrinking auxiliary device. The stator lamination assembly 4 is housed within the receiving cavity 11 of the housing member 10, and a first limiting member 13 and a second limiting member 15 respectively limit the stator lamination assembly 4 from both axial ends. In addition, the motor stator also includes conventional structures such as insulating slot paper 1, upper frame 2, lower frame 5, and windings 3.

[0065] The motor stator heat-shrink auxiliary device includes a housing component 10, a first limiting component 13, and a second limiting component 15.

[0066] The housing member 10 is generally cylindrical, with an internal cavity 11. This cavity 11 is configured to house at least a portion of the motor stator; specifically, the stator lamination assembly 4 is housed within the cavity 11. The radial dimension of the cavity 11 (i.e., the inner diameter of the housing member 10) is configured to be larger than the outer diameter of the stator lamination assembly 4. This means that when the stator lamination assembly 4 is placed within the cavity 11, a radial gap exists between the outer circumferential surface of the stator lamination assembly 4 and the inner circumferential surface of the housing member 10. This gap prevents the radial clamping force borne by the housing member 10 during heat fitting from being directly transmitted to the stator lamination assembly 4.

[0067] The outer peripheral surface of the housing component 10 is configured to form an interference fit with the inner peripheral surface of the motor housing. During heat fitting, the motor housing expands due to heat and fits onto the outer periphery of the housing component 10; after cooling and shrinking, the two form an interference fit.

[0068] The first limiting member 13 is disposed at one end of the shell member 10 (e.g., Figure 4 and Figure 5(See the lower end shown). In this embodiment, the first limiting member 13 and the shell member 10 are integrally formed, that is, they are formed into a single component by casting, machining, or other means. It is understood that in other embodiments, the first limiting member 13 and the shell member 10 can also be formed into a single unit by bolt connection, welding, or other fixed connection methods.

[0069] like Figure 4 and Figure 5 As shown, one end of the housing member 10 is provided with an annular limiting portion 12 extending radially inward. The annular limiting portion 12 has an inner edge, the channel dimension defined by the inner edge being smaller than the radial dimension of the stator lamination group 4, thereby preventing the stator lamination group 4 from dislodging from this end and realizing the axial limiting function. A first limiting member 13 is provided on the annular limiting portion 12. Specifically, the first limiting member 13 includes a plurality of first teeth 131 uniformly arranged circumferentially along the annular limiting portion 12, and the number, circumferential position, and contour dimension of the first teeth 131 correspond one-to-one with the tooth structure of the stator lamination group 4.

[0070] When the stator lamination assembly 4 is placed into the receiving cavity 11, the teeth at its lower end engage with the corresponding first teeth 131, thereby creating positioning constraints in both the circumferential and radial directions. The first teeth 131 are provided with first positioning holes 132, which are configured to engage with positioning structures (such as positioning holes or positioning posts) on the teeth of the stator lamination assembly 4. In actual stator structures, the teeth of the stator lamination assembly 4 typically have positioning structures for engaging with the upper frame 2 and lower frame 5. The position and size of the first positioning holes 132 correspond to these existing positioning structures, thus enabling precise alignment using the stator's own positioning features.

[0071] The second limiting member 15 is detachably disposed at the other end of the housing member 10 (e.g., Figure 4 (See upper end shown). In this embodiment, the second limiting member 15 includes a plurality of protruding rings and a collar cover. The protruding rings are disposed at the upper end of the housing member 10 and are spaced apart along the circumferential direction of the housing member 10, with a snap-fit ​​interface 121 formed between two adjacent protruding rings. The channel dimension defined by the inner ring of the protruding ring is larger than the radial dimension of the stator lamination group 4 so that the stator lamination group 4 can pass through the channel.

[0072] The number of card interfaces 121 is greater than or equal to 2. These card interfaces 121 are configured to form a detachable engaging engagement with the card contacts 153 of the second limiting member 15.

[0073] The collar cover has an overall annular structure, and its outer diameter is basically the same as the inner diameter of the housing component 10. Several snap-fit ​​portions 153 are provided circumferentially around the outer periphery of the collar cover. The number and size of the snap-fit ​​portions 153 correspond to the number and size of the snap-fit ​​interfaces 121. During assembly, the snap-fit ​​portions 153 of the collar cover are aligned with the snap-fit ​​interfaces 121 and pressed down, allowing the snap-fit ​​portions 153 to pass through the snap-fit ​​interfaces 121. Then, by rotating a certain angle, the snap-fit ​​portions 153 engage with the bottom of the protruding ring, thereby fixing the collar cover to the upper end of the housing component 10. This engagement method makes the installation and removal of the collar cover very convenient.

[0074] The inner ring of the collar cover is evenly provided with a number of second teeth 151 along the circumferential direction. The number, circumferential position and outline size of the second teeth 151 correspond one-to-one with the tooth structure of the stator lamination group 4. The second teeth 151 are provided with second positioning holes 152, which are also configured to cooperate with the positioning structure on the teeth of the stator lamination group 4.

[0075] The first limiting member 13 and the second limiting member 15 respectively limit the stator lamination group 4 from both ends of the axial direction. The first limiting member 13 supports and positions the stator lamination group 4 from the lower end, and the second limiting member 15 positions and presses the stator lamination group 4 from the upper end. Together, they achieve complete constraint on the stator lamination group 4 in space.

[0076] In addition, the first limiting member 13 and / or the second limiting member 15 are provided with a plurality of flow holes 14. Figure 5 and Figure 6 As shown, the flow holes 14 are distributed circumferentially, and their specific form is not limited to round holes. Rectangular holes, waist-shaped holes or other irregular structures can also be used.

[0077] The function of the flow hole 14 is to provide a flow path for cooling medium such as cooling oil during motor operation, prevent cooling oil from depositing in the upper cavity of the motor, and improve the oil content of the motor; at the same time, during the heat fitting process, the flow hole 14 can also serve as a gas discharge channel to avoid assembly defects caused by gas retention.

[0078] Example 5:

[0079] The present invention also provides an electric motor, including an electric motor housing and an electric motor stator as described above. The electric motor housing and the outer peripheral surface of the housing component 10 are formed by a thermoforming process to form an interference fit.

[0080] It should be noted that the motor stator heat-shrinking auxiliary device described in this invention does not have specific application scenario limitations. It is applicable to both segmented stators and integral stators; it is applicable to stators with different numbers of teeth and stators with different specifications and sizes. As long as the number of teeth and structural dimensions of the stator lamination group 4 correspond to the number and structural dimensions of the first tooth section 131 and the second tooth section 151, adaptation can be achieved.

[0081] Regarding the material of the shell components, there are no special restrictions on the material of the shell component 10, the first limiting component 13 and the second limiting component 15. Metal materials (such as steel, aluminum alloys, etc.) or other engineering materials with sufficient strength, rigidity and heat resistance can be selected according to actual needs.

[0082] The auxiliary device of this invention does not have special requirements for the heat-shrinking equipment itself. Existing heat-shrinking equipment heats the motor housing and then sends the stator structure into the designated position. After using this auxiliary device, the entire heat-shrinking process does not change much and has good process compatibility.

[0083] First, it should be noted that "inward" refers to the direction towards the center of the storage space, while "outward" refers to the direction away from the center of the storage space.

[0084] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the purpose of facilitating and simplifying the description of the present invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0085] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0086] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0087] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" of the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0088] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0089] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An auxiliary device for heat-shrinking a motor stator, characterized in that, include: A housing member having a receiving cavity configured to accommodate at least a portion of a motor stator, wherein the radial dimension of the receiving cavity is configured to be larger than the radial dimension of the stator laminations of the motor stator; A first limiting member is disposed at one end of the housing member to constrain the circumferential and radial displacements of the stator lamination assembly relative to the housing member. The second limiting member is detachably disposed at the other end of the housing member, and the second limiting member cooperates with the housing member to form a spatial limiting for the stator lamination assembly.

2. The auxiliary device for heat-shrinking motor stator according to claim 1, characterized in that, The first limiting member and the shell member are integrally formed or fixedly connected.

3. The auxiliary device for heat-shrinking motor stator according to claim 1, characterized in that, One end of the housing component is provided with an annular limiting portion extending radially inward. The annular limiting portion has an inner edge, and the channel dimension defined by the inner edge is smaller than the radial dimension of the stator lamination assembly. The first limiting component is disposed on the annular limiting portion.

4. The auxiliary device for heat-shrinking motor stator according to claim 3, characterized in that, The first limiting member includes a plurality of first teeth evenly arranged circumferentially along the annular limiting portion. The number, circumferential position, and contour size of the first teeth correspond one-to-one with the tooth structure of the stator lamination group.

5. The auxiliary device for heat-shrinking motor stator according to claim 4, characterized in that, The first tooth is provided with a first positioning hole, which is configured to cooperate with the positioning structure on the stator lamination tooth.

6. The auxiliary device for heat-shrinking motor stator according to claim 1, characterized in that, The second limiting structure includes several protruding rings and a collar cover. All the protruding rings are spaced apart along the circumferential direction of the housing component to form a snap-fit ​​interface between two adjacent protruding rings. The channel size defined by the inner ring of the protruding ring is larger than the radial dimension of the stator lamination assembly. The collar cover is provided with a snap-fit ​​part. The snap-fit ​​part is adapted to the position of the snap-fit ​​interface. When the snap-fit ​​part passes through the snap-fit ​​interface, it rotates to the bottom of the protruding ring to snap into the housing component.

7. The auxiliary device for heat-shrinking motor stator according to claim 6, characterized in that, The collar cover is a circular ring structure, and a number of second teeth are evenly arranged on the inner ring along the circumferential direction. The number, circumferential position and outline size of the second teeth correspond one-to-one with the tooth structure of the stator lamination group.

8. The auxiliary device for heat-shrinking motor stator according to claim 7, characterized in that, The second tooth is provided with a second positioning hole, which is configured to cooperate with the positioning structure on the stator lamination tooth.

9. The auxiliary device for heat-shrinking motor stator according to claim 1, characterized in that, The first limiting member and / or the second limiting member are provided with a plurality of flow holes, which are distributed circumferentially to form a flow channel for cooling medium or gas.

10. The auxiliary device for heat-shrinking motor stator according to claim 1, characterized in that, The outer peripheral surface of the housing component is configured to form an interference fit with the inner peripheral surface of the motor housing.

11. A motor stator, characterized in that, The device includes a stator lamination assembly and a motor stator heat-shrinking auxiliary device as described in any one of claims 1 to 10, wherein the stator lamination assembly is housed within the receiving cavity of the housing member, and the first limiting member and the second limiting member respectively limit the stator lamination assembly from both axial ends.

12. An electric motor, characterized in that, It includes a motor housing and a motor stator as described in claim 11, wherein the motor housing is interference-fitted with the outer peripheral surface of the housing component.

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