Motor and compressor with same

Abstract

The invention provides a motor and a compressor with the same. The motor comprises a shell, a stator core and an assembly part, the stator iron core is installed in the shell, a groove is formed in the outer edge of the stator iron core, and the groove extends in the axial direction of the stator iron core; the assembly part is installed in the groove, the outer edge of the assembly part comprises a first arc section and a second arc section, the first arc section is in interference fit with the shell, and the second arc section is in interference fit with the stator core. The stator core is matched with the shell through the assembly part, and the assembly part is in interference fit with the stator core and the shell, so that the stable connection between the stator core and the shell is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of compressors, and in particular relates to a motor and a compressor having the motor. Background Art

[0002] In the related art, the stator of the rotor compressor motor is heat-fitted. After the shell is heated, the shell expands and the stator is inserted into the shell. After the shell cools down, the stator and the shell are fixed by interference fit. However, in order to ensure a reliable fit, a larger interference fit is required, which will cause deformation of the stator core and cause vibration and noise problems. At the same time, the periphery of the stator is subjected to large-area compressive stress, which will increase iron loss and reduce the working efficiency of the motor. The increase in iron loss can be reduced by welding the stator and the shell, but welding will still cause local deformation of the stator due to high temperature. Especially for motors with smaller yoke sizes, it may also cause the motor insulation to break and fail. Summary of the invention

[0003] The present invention provides a motor and a compressor with the motor, which can solve the technical problem that the stator is easily deformed under high temperature, resulting in increased iron loss and reduced motor efficiency, in which the stator and the housing are fixed by shrink fitting or welding in the prior art.

[0004] The present invention provides a motor, which includes a housing, a stator core and an assembly;

[0005] The stator core is installed in the housing, and a groove is provided on the outer edge of the stator core, and the groove extends along the axial direction of the stator core;

[0006] The assembly part is installed in the groove, and the outer edge of the assembly part includes a first arc segment and a second arc segment, the first arc segment is interference fit with the housing, and the second arc segment is interference fit with the stator core.

[0007] In some embodiments, the circle corresponding to the first arc segment is a first circle, the circle corresponding to the second arc segment is a second circle, and the diameter of the first circle is greater than the diameter of the second circle.

[0008] In some implementations, the arc length of the first arc segment is L1, and the arc length of the second arc segment is L2, wherein the arc length L1 and the arc length L2 satisfy: L1>L2.

[0009] In some embodiments, the interference between the assembly and the stator core and the housing is T, the arc length of the first arc segment is L1, the inner diameter of the housing is Dk, the outer diameter of the stator core is Ds, the circle corresponding to the second arc segment is a second circle, and the diameter of the second circle is D2;

[0010] The interference fit T satisfies: invention*K1*0.0001≤T≤invention / K2, wherein K1 and K2 are constants, taking values ​​of 1 to 10.

[0011] In some embodiments, taking the longitudinal section of the shell as a projection plane, at least one end of the assembly is provided with a positioning step, the outer edge of the positioning step extends in the radial direction of the stator core, and the positioning step abuts against the end face of the stator core.

[0012] In some embodiments, at least two of the assembly parts are provided on the outer periphery of the stator core, the stator core has a first end face and a second end face, a first positioning step is provided at one end of the first assembly part, the first positioning step abuts against the first end face, and a second positioning step is provided at one end of the second assembly part, the second positioning step abuts against the second end face; in the axial direction of the stator core, the first positioning step and the second positioning step are arranged opposite to each other.

[0013] In some embodiments, the cross section of the positioning step is used as a projection surface, the positioning step is connected to the second arc segment, the maximum vertical distance between the outer edge of the positioning step and the first arc segment is D0, the inner diameter of the housing is Dk, and the outer diameter of the stator core is Ds; the cross section of the stator core is used as a projection surface, and the depth of the groove is H0;

[0014] The maximum vertical distance D0 satisfies: D0>Dk-Ds+H0.

[0015] In some embodiments, the inner wall of the housing is provided with a first positioning groove, the outer edge of the stator core is provided with a second positioning groove, and the first positioning groove and the second positioning groove are provided correspondingly;

[0016] At least one end of the assembly part is provided with an elastic positioning member, the elastic positioning member includes an elastic member and a clamping member, and the clamping members are respectively provided at both ends of the elastic member;

[0017] The assembly part is provided with a mounting through hole, which extends radially along the assembly part. The elastic part is telescopically arranged in the mounting through hole so that the locking part can extend into the first positioning groove and the second positioning groove respectively or be retracted into the mounting through hole.

[0018] In some embodiments, the assembly is provided with an oil return passage, and the oil return passage extends along the axial direction of the assembly.

[0019] In some embodiments, the stator core has stator slots and stator teeth, the minimum vertical distance between the grooves and the stator slots is t, the tooth width of the stator teeth is Ts, and the minimum vertical distance t satisfies: t≥0.5Ts.

[0020] A compressor comprises a motor, wherein the motor is the motor mentioned above.

[0021] The present invention provides a motor and a compressor having the motor, which have the following beneficial effects:

[0022] The stator core of the present invention cooperates with the housing through an assembly part, and the assembly part is in an interference fit mode with the stator core and the housing to ensure the stable connection between the stator core and the housing. Since the assembly part only contacts the local surface area of ​​the stator core, the stator core is only partially subjected to the compressive stress of the assembly part, so a smaller increase in iron loss can be guaranteed. At the same time, compared with the traditional method of welding the stator core of the housing, the problem of deformation and damage of the stator core caused by the influence of high temperature is avoided. In addition, the assembly part of the present invention can more accurately locate the position of the assembly part in the housing and the stator core through the cooperation of two different arc segments, ensuring the alignment accuracy between the stator core and the rotor of the motor. The interference fit of the two arc segments provides two contact surfaces, increasing the contact area between the assembly part and the housing and the stator core, thereby improving the strength and rigidity of the overall structure. Moreover, the first arc segment and the second arc segment cooperate, so that the force during assembly can be more evenly distributed on the assembly part, reducing local stress concentration and avoiding damage to the housing and the stator core due to uneven force. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0024] Figure 1 is a schematic diagram of a motor according to an embodiment of the present invention;

[0025] Figure 2 is an enlarged schematic diagram of a cross section of a stator core according to an embodiment of the present invention;

[0026] Figure 3 is a schematic diagram of a first arc segment and a second arc segment according to an embodiment of the present invention;

[0027] Figure 4 A schematic diagram of a transition section according to an embodiment of the present invention;

[0028] Figure 5A schematic diagram of an embodiment of the present invention when at least two assembly parts are provided;

[0029] Figure 6 is a schematic diagram of an elastic positioning member according to an embodiment of the present invention;

[0030] Figure 7 is a schematic diagram of an elastic member of an embodiment of the present invention when stretched;

[0031] Figure 8 is a schematic diagram of an elastic member of an embodiment of the present invention when it contracts;

[0032] Fig. 9 is a schematic diagram of a first positioning groove according to an embodiment of the present invention;

[0033] Fig.10 is a relationship diagram between the diameter D2 and the interference amount of an embodiment of the present invention;

[0034] Fig.11 Schematic diagram of a compressor according to an embodiment of the present invention.

[0035] Figures: 1-housing; 101-first positioning groove; 2-stator core; 21-groove; 22-stator tooth; 23-stator slot; 201-first end face; 202-second end face; 3-assembly part; 31-first arc segment; 32-second arc segment; 33-transition section; 301-mounting through hole; 4-positioning step; 5-elastic positioning member; 501-elastic member; 502-locking member; 6-oil return channel; 71-upper cover; 72-rotor core; 73-compression component; 74-lower cover. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0038] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0039] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0040] See also Figures 1 to 3 As shown, according to an embodiment of the present invention, a motor is provided, the motor comprising a housing 1, a stator core 2 and an assembly part 3; the stator core 2 is installed in the housing 1, and a groove 21 is provided on the outer edge of the stator core 2, and the groove 21 extends along the axial direction of the stator core 2; the assembly part 3 is installed in the groove 21, and the outer edge of the assembly part 3 comprises a first circular arc segment 31 and a second circular arc segment 32, the first circular arc segment 31 is interference fit with the housing 1, and the second circular arc segment 32 is interference fit with the stator core 2.

[0041] Specifically, the stator core 2 is first installed in the housing 1, the first arc segment 31 is aligned with the inner wall of the housing 1, the second arc segment 32 is aligned with the groove 21, and the assembly part 3 is pressed into the groove 21. After installation, the first arc segment 31 is interference fit with the housing 1, and the second arc segment 32 is interference fit with the stator core 2.

[0042] In this embodiment, the stator core 2 is matched with the housing 1 through the assembly part 3, and the assembly part 3 is in an interference fit with the stator core 2 and the housing 1, so as to ensure a stable connection between the stator core 2 and the housing 1. Since the assembly part 3 is in contact with only a partial surface area of ​​the stator core 2, the stator core 2 is only partially subjected to the compressive stress of the assembly part 3, so a small increase in iron loss can be ensured. At the same time, compared with the traditional method of welding the stator core 2 to fix the housing 1, the problem of deformation and damage of the stator core 2 caused by the influence of high temperature is avoided.

[0043] In addition, the assembly part 3 of this embodiment can more accurately locate the position of the assembly part 3 in the housing 1 and the stator core 2 through the cooperation of two different arc segments, ensuring the alignment accuracy between the stator core 2 and the rotor core 72 of the motor. The interference fit of the two arc segments provides two contact surfaces, increasing the contact area between the assembly part 3 and the housing 1 and the stator core 2, thereby improving the strength and rigidity of the overall structure. Moreover, the cooperation of the first arc segment 31 and the second arc segment 32 can make the force during assembly more evenly distributed on the assembly part 3, reduce local stress concentration, and avoid damage to the housing 1 and the stator core 2 due to uneven force.

[0044] As a specific implementation method, in the related art, the stator core 2 is heated by heat sleeve, and the shell 1 is inserted into the stator core 2 after the shell 1 expands. After the shell 1 cools down, the stator core 2 and the shell 1 are fixed by interference fit. However, in order to ensure reliable fit, a large interference design is required, which will cause deformation of the stator core 2 and cause vibration and noise problems. At the same time, the outer periphery of the stator core 2 is subjected to large-area compressive stress, which will increase iron loss and reduce efficiency. The outer diameter size of the stator core 2 is ≤ the inner diameter size of the shell 1 + 0.05mm, so that the stator core 2 and the shell 1 are in a clearance fit or weak interference fit state, and the stator core 2 will not be subjected to the compressive stress of the shell 1 or will be subjected to a small compressive stress, avoiding the problem of increased iron loss caused by the large interference of the traditional compressor motor.

[0045] As a specific implementation, the surface of the assembly part 3 is a non-smooth structure, which can further improve the clamping force. It uses a non-magnetic material with a certain hardness, such as stainless steel and polyester fiber. The assembly part 3 needs to apply an external force to embed it into the groove 21. The external force can be pressure or torque. In this embodiment, the preferred assembly part 3 includes a first arc segment 31 and a second arc segment 32. In other embodiments, in order to simplify the structure of the assembly part 3, the assembly part 3 can also be a cylinder. In order to ensure a sufficiently reliable clamping force between the motor and the housing 1, the diameter of the cylindrical cross section is required to be not less than 4 mm.

[0046] See also Figures 1 to 3As shown, the circle corresponding to the first arc segment 31 is a first circle, the circle corresponding to the second arc segment 32 is a second circle, and the diameter of the first circle is greater than the diameter of the second circle.

[0047] Specifically, the wall thickness of the shell 1 is relatively thin, and the diameter of the first circle corresponding to the first arc segment 31 is relatively large, so that the first arc segment 31 has a larger contact area with the shell 1, and the first arc segment 31 can fit well with the inner wall of the shell 1 to avoid stress concentration. The assembly 3 is to be installed in the groove 21, and the contact surfaces of the first arc segment 31 and the second arc segment 32 are different. The diameter of the first circle is greater than the diameter of the second circle, which means that the interference fit between the first arc segment 31 and the shell 1, and the second arc segment 32 and the stator core 2 can be different. Such a setting allows different fastening strengths to be achieved on different contact surfaces, so that the first arc segment 31 fits tighter to provide higher stability and load-bearing capacity. In addition, the motor will generate heat during operation, and different materials have different thermal expansion coefficients. By setting arc segments of different diameters, the thermal expansion characteristics of the material can be better adapted to reduce internal stress and potential matching problems caused by temperature changes.

[0048] As a specific implementation, the setting of arc segments of different diameters provides flexibility in the assembly process. In other embodiments, an appropriate assembly method can be selected according to actual assembly conditions and tolerances, such as by adjusting the diameters of the first circle and the second circle, and then adjusting the assembly pressure to adapt to different matching requirements.

[0049] See also Figures 1 to 3 As shown, the arc length of the first arc segment 31 is L1, and the arc length of the second arc segment 32 is L2, wherein the arc length L1 and the arc length L2 satisfy: L1>L2.

[0050] Specifically, the compressive stress of the mating section between the assembly part 3 and the stator core 2 needs to be greater than the gravity of the stator core 2 and the electromagnetic pulling force exerted on the stator core 2 when the motor is running, so as to ensure that the stator core 2 does not fall off the shell 1, and the compressive stress of the mating section between the assembly part 3 and the shell 1 needs to be greater than the gravity of the assembly part 3 itself and the gravity and electromagnetic pulling force exerted on the stator core 2, that is, the compressive stress between the assembly part 3 and the shell 1 is greater. Since the compressive stress is proportional to the contact area, the first arc segment 31 has an interference fit with the shell 1 and the second arc segment 32 has an interference fit with the stator core 2, combined with the arc length L1 being greater than the arc length L2, stress concentration can be better avoided.

[0051] In this embodiment, the arc length L1 of the first arc segment 31 is greater than the arc length L2 of the second arc segment 32. This arrangement means that the cooperation with the housing 1 can provide a larger contact area and a stronger fastening force, while the cooperation with the stator core 2 is relatively weak. The pressures borne on different contact surfaces are different, which is conducive to achieving different fastening strengths on different mating surfaces.

[0052] See also Figures 1 to 3 As shown, the interference between the assembly 3 and the stator core 2 and the housing 1 is T, the arc length of the first arc segment 31 is L1, the inner diameter of the housing 1 is Dk, the outer diameter of the stator core 2 is Ds, the circle corresponding to the second arc segment 32 is the second circle, and the diameter of the second circle is D2; the interference T satisfies: (πDk / L1)*K1*0.0001≤T≤(9*D2-9D2*D2+0.0045) / K2, wherein K1 and K2 are constants, taking values ​​of 1 to 10.

[0053] Specifically, since the assembly 3 has its own mass, the stress between the assembly 3 and the housing 1 must be greater than the stress between the assembly 3 and the stator core 2. The minimum stress requirement is that the assembly 3, the stator core 2 and the housing will not fall off and move. Since the compressive stress is directly related to the interference, a reasonable interference needs to be designed to ensure that the compressive stress between the assembly 3, the stator core 2 and the housing 1 is within a reasonable range. Therefore, the minimum interference is related to the contact area between the housing 1 and the assembly 3. Under the condition of meeting the minimum compressive stress, the smaller the contact area, the larger the interference is required. When the axial height of the assembly 3 is higher than or equal to the axial height of the stator core 2, the minimum value of the interference can be obtained as: (πDk / L1)*K1*0.0001.

[0054] Specifically, the core is made of thin silicon steel sheets, and its yield strength is lower than that of the shell 1. The maximum stress should be considered not to exceed the yield strength of the core. Since the compressive stress is directly related to the interference, a reasonable interference needs to be designed to ensure that the compressive stress between the assembly 3 and the stator core 2 and the shell 1 is within a reasonable range. Therefore, the maximum stress should consider the parameters between the assembly 3 and the stator core 2. When the maximum compressive stress condition is met, that is, the stress is less than the yield strength of the core, the analysis found that the diameters of the arcs of the matching sections of the assembly 3 and the stator core 2 are different, and the maximum allowable interference is also different. Through simulation analysis, it is found that when the diameter D2 is different, the maximum allowable interference will also be different, such as Fig.10 As shown, the fitting expression is: 9*D2-9D2*D2+0.0045.

[0055] In this embodiment, considering that the magnitude of stress is related to the interference, the interference T in this embodiment includes the interference when the first arc segment 31 is in interference fit with the housing 1 and the interference when the second arc segment 32 is in interference fit with the rotor core. Therefore, the interference must meet the minimum interference and cannot exceed the maximum interference. In this way, by more accurately controlling the interference, it is ensured that the fit between the assembly 3 and the stator core 2 and the housing 1 has sufficient strength and rigidity to withstand the various forces generated during the operation of the motor. In addition, the limitation of the interference can prevent excessive stress caused by excessive interference, which can cause plastic deformation or damage of the material, thereby affecting the reliability and life of the motor.

[0056] It is worth noting that since stress changes nonlinearly and considering that stress is directly related to the interference, different diameters D2 and corresponding interferences are selected for analysis and fitted into the expression 9*D2-9D2*D2+0.0045.

[0057] As a specific implementation, the assembly part 3 further includes two transition sections 33. With the cross section of the assembly part 3 as the projection surface, the two ends of each transition section 33 are respectively connected perpendicularly to the first arc section 31 and the second arc section 32. The transition section 33 can be either a straight line or an arc. The first arc section 31 can be an arc section with the same diameter, or multiple arc sections with different diameters connected in sequence. In other embodiments, it can also be composed of a broken line and an arc section. Similarly, the second arc section 32 can also adopt the above solution.

[0058] See also Figures 1 to 5 As shown, taking the longitudinal section of the housing 1 as the projection plane, at least one end of the assembly part 3 is provided with a positioning step 4, the outer edge of the positioning step 4 extends in the radial direction of the stator core 2, and the positioning step 4 abuts against the end surface of the stator core 2.

[0059] Specifically, the stator core 2 is installed in the shell 1, the first arc segment 31 is aligned with the inner wall of the shell 1, and the second arc segment 32 is aligned with the groove 21, and the end of the assembly part 3 without the positioning step 4 is first pressed into the groove 21, and then the assembly part 3 is pushed in along the axial direction of the stator core 2 until the positioning step 4 abuts against the end face of the stator core 2, indicating that the assembly part 3 has been installed in place, ensuring that the assembly part 3 is installed in the correct position in the axial direction. At this time, the first arc segment 31 has an interference fit with the shell 1, and the second arc segment 32 has an interference fit with the stator core 2.

[0060] In this embodiment, since the outer edge of the positioning step 4 protrudes from the outer wall of the assembly part 3, that is, the positioning step 4 will not be installed in the groove 21, the positioning step 4 actually provides a clear reference surface to ensure that the assembly part 3 can be accurately positioned between the stator core 2 and the housing 1 during the assembly process, and this positioning method is conducive to ensuring the positioning accuracy between the housing 1 and the stator core 2, and can more easily align and fix the assembly part 3, thereby improving the assembly efficiency and simplifying the assembly process. Moreover, under the premise that the first arc segment 31 is in interference fit with the housing 1 and the second arc segment 32 is in interference fit with the stator core 2, the positioning step 4 can provide additional fastening force in the axial direction of the stator core 2, enhance the connection strength between the assembly part 3 and the stator core 2 and the housing 1, and further ensure that the assembly part 3 will not loosen during the operation of the motor.

[0061] As a specific implementation method, the positioning step 4 can be arranged along the outer edge of the second arc segment 32. The axial length of the assembly part 3 should protrude from the end face of the stator core 2 to reserve a position for installing the positioning step 4. The positioning step 4 can also be connected to the end of the assembly part 3. The positioning step 4 itself has a certain thickness. Both methods can realize the installation of the positioning step 4 on the assembly part 3.

[0062] As a specific implementation, the side wall of the positioning step 4 connected to the assembly part 3 is arc-shaped, which can better fit the outer wall of the assembly part 3. In order to ensure that the assembly part 3 can be installed in the groove 21, the positioning step 4 is only provided on one end of the assembly part 3. In other embodiments, when the assembly part 3 is installed in place, a detachable positioning step 4 can be provided on the other end of the assembly part 3, thereby ensuring that both ends of the stator core 2 are fixed in the axial direction.

[0063] See also Figures 1 to 5 As shown, at least two assembly parts 3 are arranged on the outer periphery of the stator core 2, and the stator core 2 has a first end face 201 and a second end face 202. A first positioning step 4 is arranged at one end of the first assembly part 3, and the first positioning step 4 abuts against the first end face 201. A second positioning step 4 is arranged at one end of the second assembly part 3, and the second positioning step 4 abuts against the second end face 202. In the axial direction of the stator core 2, the first positioning step 4 and the second positioning step 4 are arranged opposite to each other.

[0064] Specifically, the stator core 2 is installed in the housing 1, and the longitudinal section of the housing 1 is used as the projection surface. The first assembly part 3 is installed first, and the first assembly part 3 is installed from the bottom of the stator core 2. The first arc segment 31 of the first assembly part 3 is aligned with the inner wall of the housing 1, and the second arc segment 32 of the first assembly part 3 is aligned with the groove 21. The end of the first assembly part 3 that is not provided with the positioning step 4 is pressed into the groove 21, and the first assembly part 3 is pushed in from bottom to top along the axial direction of the stator core 2 until the first positioning step 4 abuts against the first end face 201 of the stator core 2, indicating that the first assembly part 3 has been installed in place; then the second assembly part 3 is installed, and the second assembly part 3 is installed from the top of the stator core 2. The end of the second assembly part 3 that is not provided with the positioning step 4 is pressed into the groove 21, and the second assembly part 3 is pushed in from top to bottom along the axial direction of the stator core 2 until the second positioning step 4 abuts against the second end face 202 of the stator core 2.

[0065] In this embodiment, the stator core 2 is assembled in the housing 1, and its axial center position needs to basically coincide with the axial center position of the rotor core. The axial height error is generally within 1 mm, and the axial assembly height of the stator core 2 is required to be precisely positioned and controlled. In the traditional shrink-fit assembly method, the stator core 2 is first placed on a horizontally placed tooling, and the housing 1 is heated and then put on the outside of the stator core 2. The axial height of the stator core 2 is positioned by the end face of the housing 1 and the tooling height. In this embodiment, the stator core 2 is fixed by providing an assembly part 3. Since the axial position of the stator core 2 is not constrained and multiple assembly parts 3 are independent, when the force applied to the assembly part 3 is unbalanced, the stator core 2 may tilt. By providing a positioning step 4 in the axial direction, the verticality of the shell 1 and the end face of the stator core 2 can be ensured, and the axial air gap between the stator core 2 and the rotor core can be ensured to be consistent. The axial position of the stator core 2 can also be ensured by adjusting the depth of the positioning step 4 in the shell 1. The axial position of the stator core 2 can be adjusted by controlling the lower end assembly depth H1 and the upper end assembly depth H2 of the assembly part 3.

[0066] In this embodiment, by setting two positioning steps 4 at both ends of the stator core 2, the precise positioning of the assembly part 3 in the axial direction can be ensured. The first positioning step 4 abuts against the first end face 201 of the stator core 2, and the second positioning step 4 abuts against the second end face 202. Such a setting helps to ensure the accurate position of the assembly part 3 on the stator core 2, thereby improving the assembly accuracy and the operating performance of the motor. Setting two assembly parts 3 takes into account the symmetry and balance of the motor, which helps to achieve higher efficiency in the assembly process. In addition, setting two assembly parts 3 allows assembly operations to be performed simultaneously at both ends of the rotor core.

[0067] It is worth noting that, in this embodiment, the number of the assembly parts 3 is preferably an even number, and the assembly parts 3 are arranged in a circumferential array along the stator core 2 so that the radial force of the stator core 2 is uniform and the static eccentricity of the stator core 2 is reduced.

[0068] See also Figures 1 to 5 As shown, taking the cross section of the positioning step 4 as the projection surface, the positioning step 4 is connected to the second arc segment 32, the maximum vertical distance between the outer edge of the positioning step 4 and the first arc segment 31 is D0, the inner diameter of the housing 1 is Dk, and the outer diameter of the stator core 2 is Ds; taking the cross section of the stator core 2 as the projection surface, the depth of the groove 21 is H0; the maximum vertical distance D0, the inner diameter Dk, the outer diameter Ds and the depth H0 satisfy: D0>Dk-Ds+H0.

[0069] In this embodiment, the maximum vertical distance D0 satisfies D0>Dk-Ds+H0, ensuring the abutment between the positioning step 4 and the end face of the stator core 2, enhancing the connection stability between the assembly 3 and the stator core 2, and helping the motor to withstand various forces during operation.

[0070] It is worth noting that the depth H0 is the vertical distance from the outer edge of the stator core 2 to the inner wall of the groove 21 .

[0071] See also Figures 1 to 9 As shown, the inner wall of the shell 1 is provided with a first positioning groove 101, and the outer edge of the stator core 2 is provided with a second positioning groove, and the first positioning groove 101 is arranged corresponding to the second positioning groove; at least one end of the assembly part 3 is provided with an elastic positioning member 5, and the elastic positioning member 5 includes an elastic member 501 and a retaining member 502, and the two ends of the elastic member 501 are respectively provided with retaining members 502; the assembly part 3 is provided with a mounting through hole 301, and the mounting through hole 301 extends along the radial direction of the assembly part 3, and the elastic member 501 is telescopically arranged in the mounting through hole 301, so that the retaining member 502 extends into the first positioning groove 101 and the second positioning groove respectively or is retracted into the mounting through hole 301.

[0072] Specifically, align one end of the assembly part 3 provided with the elastic positioning part 5 with the groove 21. When the assembly part 3 is pressed into the groove 21, the elastic part 501 contracts and the two locking parts 502 are retracted into the installation through hole 301. Continue to press the assembly part 3 until the assembly part 3 is pressed into the first positioning groove 101 and the second positioning groove. The elastic force of the elastic part 501 is released, the elastic part 501 is extended, and the two locking parts 502 extend from the installation through hole 301. The two locking parts 502 extend into the first positioning groove 101 and the second positioning groove respectively. In this way, it can be determined that the assembly part 3 has been installed in place.

[0073] In this embodiment, the two retaining members 502 can extend into the first positioning groove 101 of the housing 1 and the second positioning groove of the rotor core to ensure accurate positioning between the assembly member 3 and the housing 1 and the rotor core. The elastic member 501 is telescopically arranged in the mounting through hole 301 of the assembly member 3, allowing the retaining member 502 to be telescopic, making the assembly and disassembly process easier. This design reduces the force and time required for assembly and improves assembly efficiency.

[0074] As a specific implementation, the elastic member 501 is a spring, the retaining member 502 is a ball, two balls are fixedly connected to both ends of the spring, the outer wall of the ball is more closely fitted to the first positioning groove 101 and the second positioning groove, and the ball is easier to extend into the positioning groove. In other instances, the retaining member 502 can also be a column.

[0075] It is worth noting that the axial height of the first positioning groove 101 is not higher than the height of the lowest end of the stator core 2.

[0076] See also Figures 1 to 5As shown, the assembly part 3 is provided with an oil return channel 6, which extends along the axial direction of the assembly part 3, and the minimum distance from the outer edge of the assembly part 3 to the outer wall of the oil return channel 6 is not less than 2 mm.

[0077] In this embodiment, due to the need for oil circulation inside the compressor, circulation through holes are provided on the outer periphery of the compressor stator core 2, which usually require a larger cross-sectional area of ​​the through holes. The increase in the assembly groove 21 will lead to a decrease in the circulation area, which is not conducive to oil circulation. Therefore, a through hole is provided in the center of the assembly part 3 to ensure the circulation area at the same time. The assembly part 3 is assembled between the housing 1 and the stator core 2. The setting of the return oil channel 6 helps to transfer the heat generated inside the motor through the oil circulation, thereby effectively reducing the working temperature of the motor and improving the thermal efficiency and service life of the motor. In addition, the axially extending return oil channel 6 can ensure that the cooling oil flows more evenly inside the motor, effectively cools the various components of the motor, avoids local overheating, and improves the reliability of the motor operation.

[0078] See also Figures 1 to 3 As shown, the stator core 2 has a stator slot 23 and a stator tooth 22 , the minimum vertical distance between the groove 21 and the stator slot 23 is t, the tooth width of the stator tooth 22 is Ts, and the minimum vertical distance t satisfies: t≥0.5Ts.

[0079] In this embodiment, in order to ensure assembly reliability, the groove 21 opened on the rotor core has size requirements to minimize the impact on the motor magnetic circuit. If the minimum vertical distance t is too small, the magnetic saturation at this position will be too high, which will reduce the magnetic density of the main magnetic circuit and reduce the performance of the motor. When the magnetic line density of the tooth is the highest, the magnetic lines of force of the tooth will pass through the root of the tooth, that is, the iron core between the groove 21 and the stator slot 23, and flow to the yoke on both sides of the tooth. The minimum vertical distance t is required to be not less than half of the tooth width Ds to avoid excessive magnetic saturation at this position.

[0080] See also Figure 1 and Fig.11 As shown, a compressor includes a motor, which is the motor mentioned above.

[0081] The compressor further includes an upper cover 71 , a rotor core 72 , a compression component 73 and a lower cover 74 . The upper cover 71 and the lower cover 74 are respectively connected to two ends of the shell 1 . The compression component 73 is arranged in the shell 1 , and the rotor core 72 is arranged in the stator core 2 .

[0082] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0083] The above are only 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 shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A motor, characterized in that: include: A housing (1), a stator core (2) and an assembly (3); The stator core (2) is installed in the housing (1), and a groove (21) is provided on the outer edge of the stator core (2), and the groove (21) extends along the axial direction of the stator core (2); The assembly part (3) is installed in the groove (21); the outer edge of the assembly part (3) comprises a first circular arc segment (31) and a second circular arc segment (32); the first circular arc segment (31) is interference fit with the housing (1); and the second circular arc segment (32) is interference fit with the stator core (2).

2. The motor according to claim 1, characterized in that The circle corresponding to the first arc segment (31) is a first circle, the circle corresponding to the second arc segment (32) is a second circle, and the diameter of the first circle is greater than the diameter of the second circle.

3. The motor according to claim 1, characterized in that The arc length of the first circular arc segment (31) is L1, and the arc length of the second circular arc segment (32) is L2, wherein the arc length L1 and the arc length L2 satisfy: L1>L2.

4. The motor according to claim 1, characterized in that The interference between the assembly part (3) and the stator core (2) and the housing (1) is T, the arc length of the first arc segment (31) is L1, the inner diameter of the housing (1) is Dk, the outer diameter of the stator core (2) is Ds, the circle corresponding to the second arc segment (32) is a second circle, and the diameter of the second circle is D2; The interference amount T satisfies: (πDk / L1)*K1*0.0001≤T≤(9*D2-9D2*D2+0.0045) / K2, wherein K1 and K2 are constants, with values ​​ranging from 1 to 10.

5. The motor according to any one of claims 1 to 4, characterized in that: Taking the longitudinal section of the housing (1) as a projection surface, at least one end of the assembly part (3) is provided with a positioning step (4), the outer edge of the positioning step (4) extends in the radial direction of the stator core (2), and the positioning step (4) abuts against the end face of the stator core (2).

6. The motor according to claim 5, characterized in that At least two assembly parts (3) are arranged on the outer periphery of the stator core (2); the stator core (2) has a first end face (201) and a second end face (202); one end of the first assembly part (3) is provided with a first positioning step (4), the first positioning step (4) abuts against the first end face (201); one end of the second assembly part (3) is provided with a second positioning step (4), the second positioning step (4) abuts against the second end face (202); in the axial direction of the stator core (2), the first positioning step (4) and the second positioning step (4) are arranged opposite to each other.

7. The motor according to claim 5, characterized in that Taking the cross section of the positioning step (4) as the projection surface, the positioning step (4) is connected to the second arc segment (32), the maximum vertical distance between the outer edge of the positioning step (4) and the first arc segment (31) is D0, the inner diameter of the housing (1) is Dk, and the outer diameter of the stator core (2) is Ds; taking the cross section of the stator core (2) as the projection surface, the depth of the groove (21) is H0; The maximum vertical distance D0 satisfies: D0>Dk-Ds+H0.

8. The motor according to any one of claims 1 to 4, characterized in that: The inner wall of the housing (1) is provided with a first positioning groove (101), the outer edge of the stator core (2) is provided with a second positioning groove, and the first positioning groove (101) and the second positioning groove are arranged correspondingly; At least one end of the assembly part (3) is provided with an elastic positioning part (5), the elastic positioning part (5) comprises an elastic part (501) and a retaining part (502), and the retaining parts (502) are respectively provided at both ends of the elastic part (501); The assembly part (3) is provided with a mounting through hole (301), and the mounting through hole (301) extends radially along the assembly part (3). The elastic part (501) is telescopically arranged in the mounting through hole (301) so that the locking part (502) can extend into the first positioning groove (101) and the second positioning groove respectively or be retracted into the mounting through hole (301).

9. The motor according to claim 1, characterized in that The assembly part (3) is provided with an oil return passage (6), and the oil return passage (6) extends along the axial direction of the assembly part (3).

10. The motor according to claim 1, characterized in that The stator core (2) comprises a stator slot (23) and a stator tooth (22), the minimum vertical distance between the groove (21) and the stator slot (23) is t, the tooth width of the stator tooth (22) is Ts, and the minimum vertical distance t satisfies: t≥0.5Ts.

11. A compressor, comprising a motor, characterized in that: The motor is the motor according to any one of claims 1 to 10.

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