Stator assembly, electric machine, compressor

Abstract

This invention provides a stator assembly, a motor, and a compressor, belonging to the category of energy-saving gas compressors. The stator assembly includes a stator core, at least two concentrated windings, at least two first core spacers, and at least two second core spacers. Each first core spacer is mounted at one end of the stator core, and each second core spacer is mounted at the other end. Each first and second core spacer corresponds to a stator tooth of the stator core. The corresponding first core spacer, stator tooth, and second core spacer form a tooth unit, and each concentrated winding is wound on a tooth unit. According to this invention, by using the first and second core spacers to fill the empty space at both ends of each concentrated winding, the ineffective portion at the ends of each concentrated winding is essentially eliminated, the magnetic field distribution is optimized, leakage inductance is reduced, the utilization rate of the windings and the core is improved, and the operating efficiency and stability of the motor are enhanced.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, specifically to a stator assembly, a motor, and a compressor, belonging to the category of energy-saving gas compressors. Background Technology

[0002] In variable frequency compressor motors, concentrated windings, compared to traditional distributed windings, have significant advantages in terms of lower copper consumption and higher efficiency due to their shorter end spans. Therefore, concentrated windings dominate the field of small and medium displacement compressors. Recently, a concentrated winding and embedding process has emerged, breaking through traditional process limitations. This process uses concentrated winding and then embeds the winding into the stator, enabling concentrated winding motors to achieve high power and high efficiency. However, due to the short winding span, the shaped coil is more difficult to bend, resulting in a winding end height far exceeding that of the wound motor, leading to an artificially high motor size, higher copper wire consumption, and reduced motor efficiency. Summary of the Invention

[0003] Therefore, the present invention provides a stator assembly, a motor, and a compressor, which belong to the category of energy-saving gas compressors. It can solve the technical problems of high motor volume, low material utilization, and low efficiency caused by the excessively high end of the concentrated winding in a concentrated wound motor.

[0004] To address the aforementioned problems, the present invention provides a stator assembly comprising a stator core, a concentrated winding, a first core pad, and a second core pad. The number of the concentrated winding, the first core pad, and the second core pad are all at least two. Each first core pad is mounted on one end of the stator core, and each first core pad corresponds to a stator tooth of the stator core. Each second core pad is mounted on the other end of the stator core, and each second core pad corresponds to a stator tooth of the stator core. The first core pad, the stator tooth, and the second core pad at corresponding positions form a tooth unit, and each concentrated winding is wound on each tooth unit.

[0005] In some embodiments, each of the first core pads includes a first snap-fit ​​portion, and at least two first snap-fit ​​mating portions are formed at one end of the stator core. Each of the first snap-fit ​​mating portions is distributed circumferentially along the stator core, and each of the first snap-fit ​​mating portions corresponds to each of the stator teeth. Each of the first snap-fit ​​portions engages with each of the first snap-fit ​​mating portions.

[0006] In some embodiments, the first snap-fit ​​portion is a first snap-fit ​​body formed on the first core pad, and the first snap-fit ​​mating portion is a first groove constructed at one end of the stator core, the first groove extending to the outer peripheral edge of the stator core, and the first snap-fit ​​body snapping into the first groove.

[0007] In some embodiments, the width of each of the first grooves gradually increases in the direction from the radial inner side of the stator core to the radial outer side of the stator core, and the shape of each of the first clips is adapted to the shape of each of the first grooves.

[0008] In some embodiments, the first groove has a first groove side surface and a second groove side surface extending radially along the stator core, and the included angle formed between the first groove side surface and the second groove side surface is a1, where 0 < a1 ≤ 10°.

[0009] In some embodiments, the minimum distance between the first groove at the corresponding position and the free end of the stator tooth is L1, 2mm≤L1≤5mm; and / or, the maximum distance between the first groove at the corresponding position and the sidewall of the stator tooth is L2, 1mm≤L2≤3mm.

[0010] In some embodiments, a first core pressure ring is fitted to one end of the stator core, the first core pressure ring being used to fix each of the first core pads onto the stator core.

[0011] In some embodiments, at least two first clearance grooves are formed on the first core pressure ring, and each first clearance groove is distributed circumferentially around the first core pressure ring. Each first core pad includes a first pad body, and each first pad body is respectively snapped into the first clearance groove. The first core pressure ring and the stator core are welded together.

[0012] In some embodiments, the first core retaining ring includes a first retaining ring body and at least two second snap-fit ​​portions. Each second snap-fit ​​portion is distributed circumferentially along the first retaining ring body and is located in each of the first clearance grooves. Each of the first pad bodies has a second snap-fit ​​mating portion formed thereon, and each of the second snap-fit ​​portions engages with each of the second snap-fit ​​mating portions.

[0013] In some embodiments, each of the second core pads includes a third snap-fit ​​portion, and at least two third snap-fit ​​mating portions are formed at the other end of the stator core. Each of the third snap-fit ​​mating portions is distributed circumferentially along the stator core, and each of the third snap-fit ​​mating portions corresponds to each of the stator teeth, and each of the third snap-fit ​​portions engages with each of the third snap-fit ​​mating portions.

[0014] In some embodiments, the third snap-fit ​​portion is a third snap-fit ​​body formed on the second core pad, and the third snap-fit ​​mating portion is a third groove constructed at the other end of the stator core, the third groove extending to the outer peripheral edge of the stator core, and the third snap-fit ​​body snapping into the third groove.

[0015] In some embodiments, the width of each of the third grooves gradually increases in the direction from the radial inner side of the stator core to the radial outer side of the stator core, and the shape of each of the third clips is adapted to the shape of each of the third grooves.

[0016] In some embodiments, the third groove has a third groove side and a fourth groove side extending radially along the stator core, and the included angle formed between the third groove side and the fourth groove side is a2, where 0 < a2 ≤ 10°.

[0017] In some embodiments, the minimum distance between the third groove at the corresponding position and the free end of the stator tooth is L3, 2mm≤L3≤5mm; and / or, the maximum distance between the third groove at the corresponding position and the sidewall of the stator tooth is L4, 1mm≤L4≤3mm.

[0018] In some embodiments, a second core pressure ring is fitted to the other end of the stator core, the second core pressure ring being used to fix each of the second core pads onto the stator core.

[0019] In some embodiments, at least two second clearance grooves are formed on the second core pressure ring, and each second clearance groove is distributed circumferentially around the second core pressure ring. Each second core pad includes a second pad body, and each second pad body is respectively snapped into each second clearance groove. The second core pressure ring and the stator core are welded together.

[0020] In some embodiments, the second core pressure ring includes a second pressure ring body and at least two fourth snap-fit ​​portions. Each of the fourth snap-fit ​​portions is distributed circumferentially along the second pressure ring body and is located in each of the second clearance grooves. Each of the second pad bodies has a fourth snap-fit ​​mating portion formed thereon, and each of the fourth snap-fit ​​portions engages with each of the fourth snap-fit ​​mating portions.

[0021] The present invention also provides an electric motor, including the aforementioned stator assembly.

[0022] The present invention also provides a compressor, including the aforementioned motor.

[0023] The stator assembly, motor, and compressor provided by this invention have the following beneficial effects: By using the first and second iron core pads to fill the spaces at both ends of each concentrated winding, the ineffective parts at the ends of each concentrated winding are basically eliminated, the magnetic field distribution is optimized, leakage inductance is reduced, the utilization rate of the windings and iron cores is improved, and the operating efficiency and stability of the motor are enhanced. This stator assembly can be applied to gas compressors, which is equivalent to providing an energy-saving gas compressor. Attached Figure Description

[0024] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the stator assembly according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the stator assembly after removing the first core retaining ring and the second core retaining ring according to an embodiment of the present invention. Figure 3 This is a schematic diagram of the stator core of the stator assembly according to an embodiment of the present invention; Figure 4 This is a top view of the stator core of the stator assembly according to an embodiment of the present invention; Figure 5 This is a partial top view of the stator core of the stator assembly according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the first core pad of the stator assembly according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the second core pad of the stator assembly according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of the first core retaining ring of the stator assembly according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of the second core retaining ring of the stator assembly according to an embodiment of the present invention; Figure 10 This is a schematic diagram of the structure of a stator assembly in the prior art.

[0026] The reference numerals in the attached figures are as follows: 1. Stator core; 2. Concentrated winding; 3. First core pad; 31. First snap-fit ​​part; 32. First pad body; 33. Second snap-fit ​​mating part; 4. Second core pad; 41. Third snap-fit ​​part; 42. Second pad body; 43. Fourth snap-fit ​​mating part; 5. First snap-fit ​​mating part; 6. First core pressure ring; 61. First pressure ring body; 62. Second snap-fit ​​part; 7. Third snap-fit ​​mating part; 8. Second core pressure ring; 81. Second pressure ring body; 82. Fourth snap-fit ​​part. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0028] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not 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 a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0029] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0030] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0031] See also Figures 1 to 10 As shown, according to an embodiment of the present invention, a stator assembly is provided, including a stator core 1, a concentrated winding 2, a first core pad 3, and a second core pad 4. The number of concentrated windings 2, first core pads 3, and second core pads 4 are all at least two. Each first core pad 3 is assembled at one end of the stator core 1, and each first core pad 3 corresponds to each stator tooth of the stator core 1. Each second core pad 4 is assembled at the other end of the stator core 1, and each second core pad 4 corresponds to each stator tooth of the stator core 1. The first core pads 3, stator teeth, and second core pads 4 at corresponding positions form a tooth unit, and each concentrated winding 2 is wound on each tooth unit.

[0032] In this technical solution, by using the first core pads 3 and the second core pads 4 to fill the spaces at both ends of each concentrated winding 2, the ineffective portions at the ends of each concentrated winding 2 are essentially eliminated. This optimizes the magnetic field distribution, reduces leakage inductance, improves the utilization rate of the windings and cores, and enhances the operating efficiency and stability of the motor. This stator assembly can be applied to gas compressors, essentially providing an energy-saving gas compressor. It should be noted that... Figure 10 This is a schematic diagram of the structure of a stator assembly in the prior art. Figure 10 It is evident that without the support of the first core pads 3 and the second core pads 4, the ends of each concentrated winding 2 are significantly elevated. The stator core 1 is the core component of the stator assembly, formed by axially stacking multiple silicon steel sheets, and has a central hole and multiple evenly distributed stator teeth. To facilitate subsequent winding operations, each stator tooth of the stator core 1 has a window for accommodating the passage of the conductor. The so-called concentrated winding 2 refers to the winding made using a concentrated winding and embedding process, i.e., the concentrated winding 2 is first wound on a coil mold, and then the winding is embedded phase by phase into the tooth window of the stator core 1 using an embedding tool. Compared with the traditional winding method, this embedding method can better adapt to the bending requirements of large-diameter conductors and reduce insulation damage. The first core pads 3 and the second core pads 4 are preferably silicon steel sheets or powdered soft magnetic composite materials (SMC) with good magnetic permeability. If SMC material is used, high-frequency eddy current losses can be effectively reduced, further improving motor efficiency.

[0033] See also Figure 2 , Figure 3 and Figure 6As shown, each first core pad 3 includes a first snap-fit ​​portion 31, and at least two first snap-fit ​​mating portions 5 are formed at one end of the stator core 1. Each first snap-fit ​​mating portion 5 is distributed at intervals along the circumference of the stator core 1, and each first snap-fit ​​mating portion 5 corresponds to each stator tooth. Each first snap-fit ​​portion 31 is snap-fit ​​mated with each first snap-fit ​​mating portion 5.

[0034] In this embodiment, the engagement of each first snap-fit ​​part 31 with each first snap-fit ​​mating part 5 plays a positioning role in the assembly of each first core pad 3 on the stator core 1 and increases the bonding force between the two, which can ensure the accuracy of the installation position of each first core pad 3 on the stator core 1 and the bonding strength between the two.

[0035] See also Figure 2 , Figure 3 and Figure 6 As shown, the first snap-fit ​​part 31 is a first snap-fit ​​body formed on the first iron core pad 3, and the first snap-fit ​​mating part 5 is a first groove constructed at one end of the stator iron core 1. The first groove extends to the outer peripheral edge of the stator iron core 1, and the first snap-fit ​​body snaps into the first groove.

[0036] In this technical solution, the stator core 1 is larger in volume than the first core pad 3. Constructing grooves on the stator core 1 is easier and has less impact on its structural strength. Therefore, the first snap-fit ​​part 5 is designed as a first groove at one end of the stator core 1, and the first snap-fit ​​part 31 is designed as a first snap-fit ​​body formed on the first core pad 3. It should be noted that the assembly of each first core pad 3 onto the stator core 1 is achieved by aligning the first snap-fit ​​body of each first core pad 3 with its respective first groove and inserting it radially along the stator core 1.

[0037] See also Figure 3 and Figure 4 As shown, from the radial inner side of the stator core 1 to the radial outer side of the stator core 1, the width of each first groove gradually increases, and the shape of each first clip body is adapted to the shape of each first groove.

[0038] In this embodiment, the first groove is designed as an outwardly expanding groove, which reduces the requirement for aligning each first clip with the first groove and makes it easier to assemble each first core pad 3 on the stator core 1. At the same time, due to the effect of the main magnetic flux, a strong electromagnetic force is generated between the stator and rotor, that is, the rotor will exert a strong attraction on each first core pad 3. When the shape of each first clip matches the shape of each outwardly expanding groove, this outwardly expanding groove and clip design can effectively transfer the attraction force from the rotor on each first core pad 3 to the stator core 1, ultimately achieving the purpose of preventing deformation of each first core pad 3.

[0039] See also Figure 3 and Figure 4 As shown, the first groove has a first groove side surface and a second groove side surface extending radially along the stator core 1. The included angle formed between the first groove side surface and the second groove side surface is a1. When 0 < a1 ≤ 10°, it can be ensured that the first groove is an outward expansion groove from the inside to the outside, without causing the first groove to expand too much and occupy too large an area.

[0040] See Figure 4 As shown, the minimum distance between the first groove and the free end of the stator tooth at the corresponding position is L1. When 2mm≤L1≤5mm is satisfied, it can ensure that the first groove has a sufficient extension distance into the interior of the stator core 1, and the core thickness between the first groove and the free end of the stator tooth is not too thin, because this part of the core needs to block the first core pad 3 (the rotor has an attractive force on the first core pad 3, so the first core pad 3 will exert force on this part of the core), and the thickness of this part of the core is not too thin to prevent the stator core 1 from deforming.

[0041] See Figure 4 As shown, the maximum distance between the first groove and the sidewall of the stator tooth at the corresponding position is L2. When 1mm≤L2≤3mm is satisfied, it can ensure that the first groove has sufficient width and the structural strength of the stator tooth can be guaranteed.

[0042] See also Figure 1 , Figure 6 and Figure 8 As shown, a first core retaining ring 6 is fitted to one end of the stator core 1. The first core retaining ring 6 is used to fix each first core pad 3 onto the stator core 1. By adding the first core retaining ring 6, all first core pads 3 are fixed onto the stator core 1. Each concentrated winding 2 is located radially inside the first core retaining ring 6.

[0043] See also Figure 1 , Figure 6 and Figure 8 As shown, at least two first clearance grooves are formed on the first core pressure ring 6. Each first clearance groove is distributed at intervals along the circumference of the first core pressure ring 6. Each first core pad 3 includes a first pad body 32. Each first pad body 32 is respectively snapped into each first clearance groove. The first core pressure ring 6 and the stator core 1 are welded together.

[0044] In this technical solution, after the first core retaining ring 6 and the stator core 1 are welded together, the first core retaining ring 6 will press each of the first core pads 3 tightly against the end of the stator core 1, thereby fixing each of the first core pads 3 to the stator core 1. To ensure the stability of each of the first core pads 3, each of the first core pads 3 can also be welded to the stator core 1 separately. It should be noted that the first core retaining ring 6 is roughly a ring-shaped metal part made of silicon steel. The first core retaining ring 6, each of the first core pads 3, and the stator core 1 are all welded using laser welding technology, and all joints between the first core retaining ring 6 and the stator core 1, as well as between each of the first core pads 3 and the stator core 1, are welded. The specific process is as follows: the laser welding gun moves along the circumference of the outer circle of the stator core 1, and welds the first core pressure ring 6 and each first core pad 3 to the edge of the stator core 1 together. After the welding is completed, a rigid integral structure is formed.

[0045] See also Figure 1 , Figure 6 and Figure 8 As shown, the first core pressure ring 6 includes a first pressure ring body 61 and at least two second snap-fit ​​portions 62. Each second snap-fit ​​portion 62 is distributed circumferentially along the first pressure ring body 61, and each second snap-fit ​​portion 62 is located in each first clearance groove. Each first pad body 32 has a second snap-fit ​​mating portion 33 formed on it, and each second snap-fit ​​portion 62 is snap-fit ​​mating with each second snap-fit ​​mating portion 33.

[0046] In this embodiment, the engagement of each second snap-fit ​​portion 62 with each second snap-fit ​​mating portion 33 increases the bonding force between the first core pressure ring 6 and each first core pad 3, thereby ensuring the bonding strength between the first core pressure ring 6 and each first core pad 3. Preferably, the second snap-fit ​​portion 62 is a second snap-fit ​​body formed on the first pressure ring body 61, and the second snap-fit ​​mating portion 33 is a second groove formed on the first pad body 32.

[0047] See also Figure 2 , Figure 3 and Figure 7 As shown, each of the second core pads 4 includes a third snap-fit ​​portion 41, and at least two third snap-fit ​​mating portions 7 are formed at the other end of the stator core 1. Each third snap-fit ​​mating portion 7 is distributed at intervals along the circumference of the stator core 1, and each third snap-fit ​​mating portion 7 corresponds to each stator tooth. Each third snap-fit ​​portion 41 is snap-fitted with each third snap-fit ​​mating portion 7.

[0048] In this embodiment, the engagement of each third snap-fit ​​part 41 with each third snap-fit ​​mating part 7 plays a positioning role in the assembly of each second core pad 4 on the stator core 1 and increases the bonding force between the two, which can ensure the accuracy of the installation position of each second core pad 4 on the stator core 1 and the bonding strength between the two.

[0049] See also Figure 2 , Figure 3 and Figure 7 As shown, the third snap-fit ​​part 41 is a third snap-fit ​​body formed on the second iron core pad 4, and the third snap-fit ​​mating part 7 is a third groove constructed on the other end of the stator iron core 1. The third groove extends to the outer peripheral edge of the stator iron core 1, and the third snap-fit ​​body snaps into the third groove.

[0050] In this technical solution, the stator core 1 is larger in volume than the second core pad 4. Constructing a groove on the stator core 1 is easier and has less impact on its structural strength. Therefore, the third snap-fit ​​part 7 is designed as a third groove at the other end of the stator core 1, and the third snap-fit ​​part 41 is designed as a third snap-fit ​​body formed on the second core pad 4. It should be noted that the assembly of each second core pad 4 onto the stator core 1 is achieved by aligning the third snap-fit ​​body of each second core pad 4 with the respective third groove and inserting it radially along the stator core 1. Preferably, the shape and size of the third groove are the same as the shape and size of the first groove, and the shape and size of the second core pad 4 are the same as the shape and size of the first core pad 3.

[0051] See also Figure 3 and Figure 4 As shown, from the radial inner side of the stator core 1 to the radial outer side of the stator core 1, the width of each third groove gradually increases, and the shape of each third clip body is adapted to the shape of each third groove.

[0052] In this embodiment, the third groove is designed as an outwardly expanding groove, which reduces the requirements for aligning each third clip with the third groove and makes it easier to assemble each second core pad 4 on the stator core 1. At the same time, due to the effect of the main magnetic flux, a strong electromagnetic force is generated between the stator and rotor, that is, the rotor will exert a strong attraction on each second core pad 4. When the shape of each third clip matches the shape of each outwardly expanding groove, this outwardly expanding groove and clip design can effectively transfer the attraction force from the rotor on each second core pad 4 to the stator core 1, ultimately achieving the purpose of preventing deformation of each second core pad 4.

[0053] See also Figure 3 and Figure 4As shown, the third groove has a third groove side and a fourth groove side extending radially along the stator core 1. The included angle between the third groove side and the fourth groove side is a2. When 0 < a2 ≤ 10°, it can be ensured that the third groove is an outward expansion groove from the inside to the outside, without making the third groove expand too much and occupy too much space.

[0054] See Figure 4 As shown, the minimum distance between the third groove at the corresponding position and the free end of the stator tooth is L3. When 2mm≤L3≤5mm is satisfied, it can ensure that the third groove has a sufficient extension distance into the interior of the stator core 1, and the core thickness between the third groove and the free end of the stator tooth is not too thin, because this part of the core needs to block the second core pad 4 (the rotor has an attractive force on the second core pad 4, so the second core pad 4 will exert force on this part of the core), and the thickness of this part of the core is not too thin to prevent the stator core 1 from deforming.

[0055] See Figure 4 As shown, the maximum distance between the third groove at the corresponding position and the side wall of the stator tooth is L4. When 1mm≤L4≤3mm is satisfied, it can ensure that the third groove has sufficient width and the structural strength of the stator tooth can be guaranteed.

[0056] See also Figure 1 , Figure 7 and Figure 9 As shown, a second core retaining ring 8 is assembled at the other end of the stator core 1. The second core retaining ring 8 is used to fix each second core pad 4 onto the stator core 1. By adding the second core retaining ring 8, each second core pad 4 is fixed onto the stator core 1. Among them, each concentrated winding 2 is located on the radial inner side of the second core retaining ring 8.

[0057] See also Figure 1 , Figure 7 and Figure 9 As shown, at least two second clearance grooves are formed on the second core pressure ring 8. Each second clearance groove is distributed circumferentially along the second core pressure ring 8. Each second core pad 4 includes a second pad body 42. Each second pad body 42 is respectively snapped into each second clearance groove. The second core pressure ring 8 and the stator core 1 are welded together.

[0058] In this technical solution, after the second core retaining ring 8 and the stator core 1 are welded together, the second core retaining ring 8 will press each of the second core pads 4 tightly against the end of the stator core 1, thereby fixing each of the second core pads 4 to the stator core 1. To ensure the stability of each of the second core pads 4, each of the second core pads 4 can also be welded to the stator core 1 separately. It should be noted that the second core retaining ring 8 is roughly a ring-shaped metal part made of silicon steel. The second core retaining ring 8, each of the second core pads 4, and the stator core 1 are all welded using laser welding technology, and all joints between the second core retaining ring 8 and the stator core 1, as well as between each of the second core pads 4 and the stator core 1, are welded. The specific process is as follows: the laser welding gun moves along the circumference of the outer circle of the stator core 1, fusing the second core retaining ring 8 and each second core pad 4 to the edge of the stator core 1. After welding, a highly rigid integral structure is formed. In summary, the stator assembly of this application adopts an integrated manufacturing process of "wire embedding - insert embedding - retaining ring clamping - laser welding", which ensures the overall rigidity and electrical performance of the stator assembly.

[0059] See also Figure 1 , Figure 7 and Figure 9 As shown, the second core pressure ring 8 includes a second pressure ring body 81 and at least two fourth locking portions 82. Each fourth locking portion 82 is distributed circumferentially along the second pressure ring body 81, and each fourth locking portion 82 is located in each second clearance groove. Each second pad body 42 has a fourth locking engagement portion 43 formed on it, and each fourth locking portion 82 engages with each fourth locking engagement portion 43.

[0060] In this embodiment, the engagement of each fourth snap-fit ​​portion 82 with each fourth snap-fit ​​mating portion 43 increases the bonding force between the second core pressure ring 8 and each second core pad 4, thereby ensuring the bonding strength between the second core pressure ring 8 and each second core pad 4. Preferably, the fourth snap-fit ​​portion 82 is a fourth snap-fit ​​body formed on the second pressure ring body 81, and the fourth snap-fit ​​mating portion 43 is a fourth groove formed on the second pad body 42. Preferably, the shape and size of the second core pressure ring 8 are the same as those of the first core pressure ring 6.

[0061] The present invention also provides an electric motor, including the aforementioned stator assembly. The core pad solution of this application can be applied to various types of motors, such as 6-slot 4-pole and 12-slot 8-pole motors.

[0062] The present invention also provides a compressor including the aforementioned motor, and the compressor of this application particularly refers to a variable frequency compressor.

[0063] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0064] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A stator assembly, characterized in that, The device includes a stator core (1), a concentrated winding (2), a first core pad (3), and a second core pad (4). The number of the concentrated winding (2), the first core pad (3), and the second core pad (4) is at least two. Each first core pad (3) is assembled at one end of the stator core (1), and each first core pad (3) corresponds to a stator tooth of the stator core (1). Each second core pad (4) is assembled at the other end of the stator core (1), and each second core pad (4) corresponds to a stator tooth of the stator core (1). The first core pad (3), the stator tooth, and the second core pad (4) at corresponding positions form a tooth unit. Each concentrated winding (2) is wound on each tooth unit.

2. The stator assembly according to claim 1, characterized in that, Each of the first iron core pads (3) includes a first snap-fit ​​portion (31). At least two first snap-fit ​​mating portions (5) are formed at one end of the stator iron core (1). Each of the first snap-fit ​​mating portions (5) is distributed circumferentially along the stator iron core (1), and each of the first snap-fit ​​mating portions (5) corresponds to each of the stator teeth. Each of the first snap-fit ​​portions (31) is snap-fit ​​mated with each of the first snap-fit ​​mating portions (5).

3. The stator assembly according to claim 2, characterized in that, The first snap-fit ​​part (31) is a first snap-fit ​​body formed on the first iron core pad (3), and the first snap-fit ​​mating part (5) is a first groove constructed at one end of the stator iron core (1). The first groove extends to the outer peripheral edge of the stator iron core (1), and the first snap-fit ​​body snaps into the first groove.

4. The stator assembly according to claim 3, characterized in that, From the radial inner side of the stator core (1) to the radial outer side of the stator core (1), the width of each of the first grooves gradually increases, and the shape of each of the first clips is adapted to the shape of each of the first grooves.

5. The stator assembly according to claim 4, characterized in that, The first groove has a first groove side surface and a second groove side surface extending radially along the stator core (1), and the included angle formed between the first groove side surface and the second groove side surface is a1, 0<a1≤10°.

6. The stator assembly according to claim 3, characterized in that, The minimum distance between the first groove at the corresponding position and the free end of the stator tooth is L1, 2mm≤L1≤5mm; and / or, the maximum distance between the first groove at the corresponding position and the sidewall of the stator tooth is L2, 1mm≤L2≤3mm.

7. The stator assembly according to claim 1, characterized in that, One end of the stator core (1) is equipped with a first core pressure ring (6), which is used to fix each of the first core pads (3) on the stator core (1).

8. The stator assembly according to claim 7, characterized in that, At least two first clearance grooves are formed on the first iron core pressure ring (6). Each first clearance groove is distributed at intervals along the circumference of the first iron core pressure ring (6). Each first iron core pad (3) includes a first pad body (32). Each first pad body (32) is respectively snapped into each first clearance groove. The first iron core pressure ring (6) and the stator iron core (1) are welded together.

9. The stator assembly according to claim 8, characterized in that, The first iron core pressure ring (6) includes a first pressure ring body (61) and at least two second snap-fit ​​portions (62). Each second snap-fit ​​portion (62) is distributed circumferentially along the first pressure ring body (61), and each second snap-fit ​​portion (62) is located in each first clearance groove. Each first pad body (32) has a second snap-fit ​​mating portion (33) formed on it, and each second snap-fit ​​portion (62) is snap-fit ​​mating with each second snap-fit ​​mating portion (33).

10. The stator assembly according to any one of claims 1 to 9, characterized in that, Each of the second core pads (4) includes a third snap-fit ​​portion (41). At least two third snap-fit ​​mating portions (7) are formed at the other end of the stator core (1). Each of the third snap-fit ​​mating portions (7) is distributed circumferentially along the stator core (1), and each of the third snap-fit ​​mating portions (7) corresponds to each of the stator teeth. Each of the third snap-fit ​​portions (41) is snap-fitted to each of the third snap-fit ​​mating portions (7).

11. The stator assembly according to claim 10, characterized in that, The third snap-fit ​​part (41) is a third snap-fit ​​body formed on the second iron core pad (4), and the third snap-fit ​​mating part (7) is a third groove constructed at the other end of the stator iron core (1). The third groove extends to the outer peripheral edge of the stator iron core (1), and the third snap-fit ​​body snaps into the third groove.

12. The stator assembly according to claim 11, characterized in that, From the radial inner side of the stator core (1) to the radial outer side of the stator core (1), the width of each of the third grooves gradually increases, and the shape of each of the third clips is adapted to the shape of each of the third grooves.

13. The stator assembly according to claim 12, characterized in that, The third groove has a third groove side and a fourth groove side extending radially along the stator core (1), and the included angle formed between the third groove side and the fourth groove side is a2, 0<a2≤10°.

14. The stator assembly according to claim 11, characterized in that, The minimum distance between the third groove at the corresponding position and the free end of the stator tooth is L3, 2mm≤L3≤5mm; and / or, the maximum distance between the third groove at the corresponding position and the sidewall of the stator tooth is L4, 1mm≤L4≤3mm.

15. The stator assembly according to claim 1, characterized in that, The other end of the stator core (1) is equipped with a second core pressure ring (8), which is used to fix each of the second core pads (4) on the stator core (1).

16. The stator assembly according to claim 15, characterized in that, At least two second clearance grooves are formed on the second core pressure ring (8). Each second clearance groove is distributed at intervals along the circumference of the second core pressure ring (8). Each second core pad (4) includes a second pad body (42). Each second pad body (42) is respectively snapped into each second clearance groove. The second core pressure ring (8) and the stator core (1) are welded together.

17. The stator assembly according to claim 16, characterized in that, The second iron core pressure ring (8) includes a second pressure ring body (81) and at least two fourth snap-fit ​​portions (82). Each of the fourth snap-fit ​​portions (82) is distributed circumferentially along the second pressure ring body (81), and each of the fourth snap-fit ​​portions (82) is located in each of the second clearance grooves. Each of the second pad block bodies (42) has a fourth snap-fit ​​mating portion (43) formed on it, and each of the fourth snap-fit ​​portions (82) is snap-fit ​​mating with each of the fourth snap-fit ​​mating portions (43).

18. An electric motor, characterized in that it includes a stator assembly as described in any one of claims 1 to 17.

19. A compressor, characterized in that it includes the motor as described in claim 18.

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