Stator core, stator assembly and motor thereof

Abstract

This invention discloses a stator core, a stator assembly, and a motor thereof. The stator teeth of the stator core are disposed on the inner circumferential surface of the yoke, and the stator slots are formed between two adjacent stator teeth. The two opposing sides of the stator teeth are arranged in parallel, and the pole shoes are installed at the slot openings of the stator slots. Compared with non-segmented motors, the stator windings can be pre-wound on the winding mold and then directly embedded into the stator teeth, which can improve the slot fill factor. The wire diameter of the coil in the stator slot can be increased, the circumference can be reduced, the resistance can be reduced, and the copper loss can be reduced. Compared with segmented or chained motors, there are no gaps in the yoke of the stator core, the magnetic circuit of the yoke is continuous, the iron loss is small, the stiffness is large, the motor efficiency is high, and the noise is low. Installing the pole shoes at the slot openings of the stator slots closes the slot openings, eliminating the problem of large cogging torque caused by large changes in magnetic permeability at the slot openings. The cogging torque is extremely small, which can greatly reduce motor vibration and noise and improve motor operation stability.

Description

Technical Field

[0001] This invention relates to the field of motor manufacturing technology, and in particular to a stator core, stator assembly and motor thereof. Background Technology

[0002] The most common type of fractional-slot concentrated winding permanent magnet motor is one where the stator core is not segmented, and the stator laminations are a single piece, wound by a winding machine. Another type uses segmented or chain-type cores. The former results in a low slot fill factor and high copper losses because the winding machine's nozzle needs to extend into the stator slots, requiring ample space within the slots to accommodate the nozzle. Increasing the slot fill factor reduces electrical safety and increases the probability of arcing in the motor windings. Additionally, the stator slot openings also require a certain width, leading to higher stator cogging torque. The latter type solves the low slot fill factor problem, but segmented or chain-type cores still involve dividing the core into multiple pieces. Even after assembling them into a complete circle, gaps remain between the pieces in the stator core yoke, obstructing the magnetic circuit and increasing iron losses. Some segmented motors also have slot openings, resulting in the same issue of high cogging torque. Furthermore, because the laminations in segmented or chain-type cores are not completely round, the stator core stiffness is reduced, leading to worse motor noise. Summary of the Invention

[0003] The purpose of this invention is to provide a stator core, stator assembly and motor thereof, which aims to solve the technical problems of low slot fill factor and large copper loss in the integrated stator core of existing motors, and large cogging torque in the segmented stator core.

[0004] To address the aforementioned problems, according to one aspect of this application, an embodiment of the present invention provides a stator core, which includes a yoke, stator teeth, stator slots, and pole shoes. The stator teeth are disposed on the inner circumferential surface of the yoke, the stator slots are formed between two adjacent stator teeth, the two opposing sides of the stator teeth are arranged in parallel, and the pole shoes are installed at the slot opening of the stator slot to seal the slot opening.

[0005] In some embodiments, the stator core further includes an insulating partition structure installed in the stator slot and fixed to the pole shoe to insulatingly partition the internal space of the stator slot.

[0006] In some embodiments, the insulating separation structure includes a first partition plate extending radially and axially along the stator core, one end of which is fixed to the pole shoe.

[0007] In some embodiments, the insulating separation structure further includes a second separation plate that is intersected with the first separation plate, the side of the pole shoe facing the first separation plate has a slot, the portion of the first separation plate located on the second separation plate facing the pole shoe is inserted into the slot, and the second separation plate is located on the side of the pole shoe facing the yoke.

[0008] In some embodiments, the first partition plate and the second partition plate are arranged perpendicularly, and in the width direction of the stator slot, the length of the second partition plate on both sides of the first partition plate is equal.

[0009] In some embodiments, the thickness A1 of the second partition plate is in the range of 0.2mm < A1 ≤ 0.35mm; and / or the distance D1 between the second partition plate and the stator tooth is in the range of 0 ≤ D1 < 0.25mm.

[0010] In some embodiments, the thickness A2 of the first partition plate is in the range of 0.2mm < A2 < 1mm; and / or the distance D2 between the first partition plate and the bottom edge of the stator slot is in the range of 0 < D2 < 0.1mm.

[0011] In some embodiments, the pole shoe has parallel inner end edges and outer end edges of the slot, and the second partition plate is fitted to the inner end edge of the slot; the distance d1 between the axis of the stator core and the outer end edge of the slot is in the range of: R≤d1≤1.02R; and / or, the distance d2 between the axis of the stator core and the inner end edge of the slot is 1.02R<d2<1.07R; where R is the radius of the inner diameter of the stator core.

[0012] In some embodiments, the length of the pole shoe is equal to the length of the stator core in the axial direction of the stator core, and at least one end of the first partition plate has an extension extending out of the pole shoe; the extension length L of the extension satisfies: 3mm≤L≤H, where H is the height of the stator coil corresponding to the end of the first partition plate extending out; and / or, the extension has a snap-fit ​​portion extending radially inward along the stator core to engage with the end of the pole shoe, and the distance S1 between the end of the snap-fit ​​portion and the second partition plate satisfies: S1<(d2-d1).

[0013] In some embodiments, the width of the outer end edge of the slot is B1, and the side of the pole shoe away from the yoke is provided with a transition arc segment near both ends, the distance between the two transition arc segments is B2, B1≤B2; and / or, the side of the pole shoe is parallel to the inner wall of the stator slot, and the value range of the distance D3 between the side of the pole shoe and the inner wall of the stator slot satisfies: 0<D3≤0.2mm.

[0014] In some embodiments, in the width direction of the stator slot; at least one end of the pole shoe is provided with a positioning boss, and the stator teeth are provided with grooves adapted to the positioning boss; and / or, at least one end of the pole shoe is provided with a groove, and the stator teeth are provided with positioning bosses adapted to the grooves.

[0015] According to another aspect of this application, embodiments of the present invention also provide a stator assembly, which includes stator windings and a stator core as described above. The stator windings are sleeved on stator teeth. When the stator core includes an insulating separation structure, the insulating separation structure is clamped between two adjacent stator windings.

[0016] According to another aspect of this application, embodiments of the present invention also provide an electric motor that includes a stator assembly as described above.

[0017] Compared with the prior art, the stator core of the present invention has at least the following beneficial effects:

[0018] This invention discloses a stator core with stator teeth disposed on the inner circumferential surface of the yoke, stator slots formed between two adjacent stator teeth, and two opposing sides of the stator teeth arranged in parallel. Pole shoes are mounted at the slot openings of the stator slots. This invention employs a structure where the stator slots and pole shoes are separated. Compared to the stator cores of conventional non-segmented motors, because the stator slots and pole shoes are separated, the two opposing sides of the stator teeth can be arranged in parallel. Since the two opposing sides of the stator teeth have a parallel structure, the coil circumference of the stator winding does not need to be increased to avoid the pole shoes. The stator winding can be pre-wound on the winding die and then directly embedded into the stator teeth, which can improve the slot fill factor. This reduces the coil circumference of the stator winding and eliminates the need to reserve space for the winding nozzle in the stator slots. The wire diameter of the coil in the stator slot can be increased, the circumference reduced, the resistance decreased, and the copper loss lowered.

[0019] Compared to the stator core of a segmented motor or a chain motor, the yoke of the stator core of this invention has a complete structure without multiple gaps. The magnetic circuit of the yoke is continuous, resulting in low iron loss, high stiffness, high motor efficiency, and low noise.

[0020] In this embodiment, the stator core has the pole shoes installed at the slot opening of the stator slot, so that the slot opening is closed. This eliminates the problem of large cogging torque caused by large changes in magnetic permeability at the slot opening. The cogging torque is extremely small, which can greatly reduce motor vibration and noise and improve motor operation stability.

[0021] In another aspect, the stator assembly provided by the present invention is manufactured based on the above-mentioned stator core, and its beneficial effects are the same as those of the above-mentioned stator core, which will not be repeated here.

[0022] In another aspect, the motor provided by the present invention is manufactured based on the above-mentioned stator assembly, and its beneficial effects are the same as those of the above-mentioned stator assembly, which will not be repeated here.

[0023] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A three-dimensional structural diagram of the stator core provided in an embodiment of the present invention;

[0026] Figure 2 A partially enlarged view of the stator core provided in an embodiment of the present invention;

[0027] Figure 3 A three-dimensional exploded view of the stator core provided in an embodiment of the present invention;

[0028] Figure 4 A partially enlarged view of another location of the stator core provided in an embodiment of the present invention;

[0029] Figure 5 A schematic diagram of the insulation separation structure of the stator core and the assembly structure of the pole shoes provided in an embodiment of the present invention;

[0030] Figure 6 A schematic diagram of the insulation separation structure of the stator core provided in an embodiment of the present invention;

[0031] Figure 7 A three-dimensional structural diagram of the pole shoe of the stator core provided in an embodiment of the present invention;

[0032] Figure 8 This is a schematic diagram of the pole shoe of the stator core provided in an embodiment of the present invention from another perspective.

[0033] Figure 9 This is a partial enlarged view of the stator slot of the stator core provided in an embodiment of the present invention;

[0034] Figure 10 This is a schematic diagram of the stator core structure provided in an embodiment of the present invention;

[0035] Figure 11 This is a schematic diagram of the structure of the motor provided in an embodiment of the present invention;

[0036] Figure 12 A comparison chart of the fill rate between the mass production plan and this plan;

[0037] Figure 13 A comparison chart of cogging torque between the mass production solution and this solution;

[0038] Figure 14 This is a schematic diagram of the stator windings of the stator assembly filling the stator slots according to an embodiment of the present invention;

[0039] Figure 15 A schematic diagram showing the stator windings of an existing integrated iron core filling the stator slots;

[0040] Figure 16 This is a schematic diagram of the existing modular iron core structure.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. Yoke;

[0043] 2. Stator teeth; 21. Groove;

[0044] 3. Stator slots;

[0045] 4. Pole shoe; 41. Slot; 42. Inner edge of the slot; 43. Outer edge of the slot; 44. Positioning boss; 45. Transition arc segment;

[0046] 5. Insulating partition structure; 51. First partition plate; 511. Extension; 512. Snap-fit ​​part; 52. Second partition plate;

[0047] 6. Stator winding; 61. Stator coil; 62. Lead wire;

[0048] 7. Piece; 71. Piece gap. Detailed Implementation

[0049] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the specific embodiments, structures, features, and effects according to the present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0050] In the description of this invention, it should be clearly stated that the terms "first," "second," etc., in the specification, claims, and accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence; the terms "vertical," "lateral," "longitudinal," "front," "rear," "left," "right," "up," "down," "horizontal," etc., indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, and are merely for the convenience of describing this invention, and do not mean that the device or element referred to must have a specific orientation or position, and therefore should not be construed as a limitation of this invention.

[0051] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0052] Example 1

[0053] like Figure 1-16 As shown, an embodiment of the present invention provides a stator core, which includes a yoke 1, stator teeth 2, stator slots 3, and pole shoes 4. The stator teeth 2 are disposed on the inner circumferential surface of the yoke 1, the stator slots 3 are formed between two adjacent stator teeth 2, the two opposite sides of the stator teeth 2 are arranged in parallel, and the pole shoes 4 are installed in the slot opening of the stator slot 3 to seal the slot opening.

[0054] In this embodiment, the stator teeth 2 of the stator core are disposed on the inner circumferential surface of the yoke 1, the stator slots 3 are formed between two adjacent stator teeth 2, and the two opposing sides of the stator teeth 2 are arranged in parallel. Specifically, the two opposing sides of the stator teeth 2 are the sidewalls of the stator slots 3. The pole shoes 4 are installed in the slot openings of the stator slots 3 and can be made of silicon steel. This embodiment adopts a structure in which the stator slots 3 and pole shoes 4 are separated. Compared with the stator core of a conventional non-segmented motor, because the stator slots 3 and pole shoes 4 are separated, the two opposing sides of the stator teeth 2 can be arranged in parallel. The two opposing sides of the stator teeth 2 are parallel structures, and the coil circumference of the stator winding 6 does not need to be increased to avoid the pole shoes 4. The stator winding 6 can be pre-wound on the winding mold and then directly embedded into the stator teeth 2. This can improve the slot fill factor; thus, the coil circumference of stator winding 6 can be reduced, and there is no need to reserve space for the winding nozzle in stator slot 3. The wire diameter of the coil in stator slot 3 can be increased, the circumference can be reduced, the resistance can be reduced, and the copper loss can be reduced. Specifically, due to process issues, the whole round straight winding requires a large space in stator slot 3 for the winding nozzle of the winding machine, resulting in a low slot fill factor. However, this embodiment adopts the embedded wire process and parallel teeth, which can greatly improve the slot fill factor. Compared with the stator with the embedded wire process of the whole round iron core, this embodiment separates the stator teeth 2 from the pole shoes 4. When embedding wire, the winding circumference does not need to be extended to avoid the pole shoes 4 (the extended part will eventually be reflected at the winding end). A smaller winding circumference can be embedded wire, and the winding end can be shorter. Finally, the winding resistance and copper loss are significantly reduced.

[0055] Compared to the stator core of a segmented motor or a chain motor, the yoke 1 of the stator core in this embodiment is a complete structure without multiple gaps. The magnetic circuit of the yoke 1 is continuous, resulting in low iron loss, high rigidity, high motor efficiency, and low noise.

[0056] Specifically, such as Figure 16 As shown, this is a common type of modular iron core. There are gaps 71 between the modules 7, which are essentially air. The magnetic conductivity of air is much lower than that of silicon steel sheets. The magnetic lines of force passing through the stator teeth 2 (such as...) Figure 16 As indicated by the middle arrow, when passing through the interlocking gap 71, the magnetic resistance increases significantly, and the leakage flux also increases. On the one hand, this leads to a decrease in the magnetic performance of the motor, affecting the output of the motor, and on the other hand, it increases the iron loss of the motor. The chain-type iron core is similar to the interlocking iron core, and also has the problem of the main magnetic circuit being cut off. Both the interlocking iron core and the chain-type iron core will reduce the stiffness of the stator iron core, which will have an adverse effect on noise and vibration. In this embodiment, the separation of the stator tooth 2 from the pole shoe 4 does not affect the main magnetic circuit of the stator tooth 2 and the yoke 1, does not affect the magnetic performance of the motor, and does not cause an increase in iron loss. At the same time, the stiffness of the stator iron core is not affected.

[0057] In this embodiment, the stator core has the pole shoe 4 installed at the slot opening of the stator slot 3, so that the slot opening of the stator slot 3 is closed. This eliminates the problem of large cogging torque caused by large changes in magnetic permeability at the slot opening of the stator slot 3. The cogging torque is extremely small, which can greatly reduce motor vibration and noise and improve motor operation stability.

[0058] This embodiment improves motor efficiency by increasing the slot fill factor without cutting off the main magnetic circuit, while reducing copper and iron losses. It also utilizes the advantage of separating stator teeth 2 from pole shoes 4 to improve the common open slots of stator slot 3 into closed slots, which greatly reduces motor cogging torque and motor noise.

[0059] In some embodiments, the stator core further includes an insulating partition structure 5, which is installed in the stator slot 3 and fixed to the pole shoe 4 to insulatingly partition the internal space of the stator slot 3.

[0060] In this embodiment, the insulating separation structure 5 is installed on the pole shoe 4, so that the insulating separation structure 5 and the pole shoe 4 are designed as an integral structure. The internal space of the stator slot 3 can be insulatingly separated by the insulating separation structure 5. Specifically, the insulating separation structure 5 is located in the middle of the stator slot 3, which can effectively isolate the stator winding 6 between two phases in the stator slot 3, ensure the insulation strength between phases, effectively prevent arcing between phase windings, improve the reliability of the motor, and improve the slot fill factor.

[0061] pass Figure 12 , Figure 14 and Figure 15 It can be clearly concluded that the slot fill factor of the stator core in this embodiment (this scheme) is greater than that of the stator core in the mass production scheme.

[0062] In some embodiments, the insulating separation structure 5 includes a first partition plate 51 extending radially and axially along the stator core, one end of the first partition plate 51 being fixed to the pole shoe 4.

[0063] In this embodiment, the internal space of the stator slot 3 is insulated and separated by the first partition plate 51 extending radially and axially along the stator core by the insulating partition structure 5. The first partition plate 51 is fixed by fixing one end of the first partition plate 51 to the pole shoe 4.

[0064] In some embodiments, the insulating separation structure 5 further includes a second separation plate 52 that is intersected with the first separation plate 51. The pole shoe 4 has a slot 41 on the side facing the first separation plate 51. The portion of the first separation plate 51 located on the second separation plate 52 facing the pole shoe 4 is inserted into the slot 41. The second separation plate 52 is located on the side of the pole shoe 4 facing the yoke 1. The insulating separation structure 5 is fixedly assembled by the cooperation of the second separation plate 52, the portion of the first separation plate 51 located on the second separation plate 52 facing the pole shoe 4, and the slot 41 of the pole shoe 4, preventing the first separation plate 51 from shaking in the stator slot 3. In addition, the second separation plate 52 can separate the pole shoe 4 from the stator winding 6, providing insulation and improving insulation performance.

[0065] In some embodiments, the first partition plate 51 and the second partition plate 52 are arranged perpendicularly. In the width direction of the stator slot 3, the lengths of the portions of the second partition plate 52 located on both sides of the first partition plate 51 are equal, which can make the dimensions of the two-phase wound stator windings 6 in the stator slot 3 consistent, which is convenient for winding.

[0066] In some embodiments, the thickness A1 of the second partition plate 52 is within the range of 0.2mm < A1 ≤ 0.35mm. The second partition plate 52 serves as insulation. If the thickness A1 of the second partition plate 52 is too thin, it is easy to be broken down. If it is too thick, it will occupy the space of the stator slot 3, reduce the slot fill factor of the motor and thus affect the performance. The range of the thickness A1 of the second partition plate 52 in this embodiment can make the performance and reliability of the motor relatively balanced.

[0067] In some implementations, the distance D1 between the second partition plate 52 and the stator tooth 2 is set to 0 ≤ D1 < 0.25 mm. Theoretically, D1 equals 0, which is best, but in practice, assembly and other process issues need to be considered, so a smaller range is chosen to facilitate assembly.

[0068] In some embodiments, the thickness A2 of the first partition plate 51 is within the range of 0.2mm < A2 < 1mm. The first partition plate 51 mainly serves as a phase separator, that is, it provides phase-to-phase insulation. If it is too thin, it is easily broken down; if it is too thick, it occupies slot area and reduces the motor slot fill factor. The thickness A2 of the first partition plate 51 in this embodiment can serve as a phase separator while avoiding occupying the space of the stator slot 3, thereby improving the motor slot fill factor.

[0069] In some embodiments, the distance D2 between the first partition plate 51 and the bottom edge of the stator slot 3 is in the range of 0 < D2 < 0.1 mm. The range of values ​​in this embodiment ensures that the components can be assembled and that the two-phase windings will not come into contact due to the large gap.

[0070] In some embodiments, the pole shoe 4 has a slot inner end edge 42 and a slot outer end edge 43 arranged in parallel, and the second partition plate 52 is fitted to the slot inner end edge 42; the distance d1 between the axis of the stator core and the slot outer end edge 43 is satisfied in the range of: R≤d1≤1.02R, where R is the radius of the inner diameter of the stator core; the range of values ​​in this embodiment ensures that the pole shoe 4 will not exceed the inner diameter of the stator core, thus avoiding affecting the operation of the motor; forming a non-uniform air gap improves the harmonics of the motor air gap magnetic field.

[0071] In some embodiments, the distance d2 between the axis of the stator core and the inner end edge 42 of the slot satisfies 1.02R < d2 < 1.07R, where R is the radius of the inner diameter of the stator core; the range of values ​​in this embodiment ensures that the pole shoe 4 has a certain thickness without occupying too much area of ​​the stator slot 3, thus avoiding affecting the slot fill factor.

[0072] In some embodiments, the length of the pole shoe 4 is equal to the length of the stator core in the axial direction of the stator core. At least one end of the first partition plate 51 has an extension 511 extending out of the pole shoe 4. The extension length L of the extension 511 satisfies: 3mm≤L≤H, where H is the height of the stator coil 61 corresponding to the end of the first partition plate 51 extending out. This ensures that the phases at both ends of the stator core shaft phase are separated, providing phase-to-phase insulation, while also ensuring that the extension does not exceed the stator coil 61 and affect the motor installation.

[0073] Specifically, in the axial direction of the stator core, there can be two extensions 511, namely a first extension and a second extension. The extension length of the first extension can be L1, and the extension length of the second extension can be L2. The values ​​of L1 and L2 are in the same range as L, but L1 and L2 can be equal or unequal. The specific value of L1 depends on the specific value of the height L1 of the stator coil 61 corresponding to the first extension, and the specific value of L2 depends on the specific value of the height L2 of the stator coil 61 corresponding to the second extension.

[0074] In some embodiments, the extension 511 has a snap-fit ​​portion 512 that extends radially inward along the stator core to snap onto the end of the pole shoe 4. The distance S1 between the end of the snap-fit ​​portion 512 and the second partition plate 52 is such that S1 < (d2-d1), ensuring that the snap-fit ​​portion 512 will not extend beyond the pole shoe 4 after the insulating partition structure 5 is assembled with the pole shoe 4; and preventing the snap-fit ​​portion 512 from extending into the inner diameter of the stator core and affecting the operation of the rotor.

[0075] In some embodiments, the width of the outer end edge 43 of the slot is B1, and the side of the pole shoe 4 away from the yoke 1 is provided with a transition arc segment 45 near both ends. The transition arc segment 45 is concentric with the inner circle of the stator core, and the distance between the two transition arc segments 45 is B2, B1≤B2; this can form an uneven air gap and improve the harmonics of the motor air gap magnetic field.

[0076] In some embodiments, the side of the pole shoe 4 is parallel to the inner wall of the stator slot 3, and the distance D3 between the side of the pole shoe 4 and the inner wall of the stator slot 3 is within the range of 0 < D3 ≤ 0.2 mm. The range of values ​​in this embodiment can ensure that it can be assembled and that the magnetic resistance is not increased as much as possible.

[0077] In some embodiments, at least one end of the pole shoe 4 is provided with a positioning boss 44 in the width direction of the stator slot 3, and the stator tooth 2 is provided with a groove 21 that matches the positioning boss 44, so as to facilitate the positioning and installation of the pole shoe 4 and the stator tooth 2.

[0078] In some embodiments, at least one end of the pole shoe 4 is provided with a groove 21, and the stator tooth 2 is provided with a positioning boss 44 that matches the groove 21, so as to facilitate the positioning and installation of the pole shoe 4 and the stator tooth 2.

[0079] Example 2

[0080] This invention also provides a stator assembly, which includes a stator winding 6 and a stator core of embodiment 1. The stator winding 6 is sleeved on the stator teeth 2. When the stator core includes an insulating separation structure 5, the insulating separation structure 5 is clamped between two adjacent stator windings 6. The lead wire 62 is used to lead out the stator winding 6.

[0081] Example 3

[0082] This invention also provides an electric motor, which includes the stator assembly of embodiment 2.

[0083] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the devices, apparatuses, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0084] 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 person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered 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. A stator core, characterized in that, The stator core includes a yoke, stator teeth, stator slots, and pole shoes. The stator teeth are disposed on the inner circumferential surface of the yoke. The stator slots are formed between two adjacent stator teeth. The two opposite sides of the stator teeth are arranged in parallel. The pole shoes are installed in the slot opening of the stator slot to seal the slot opening. The stator core also includes an insulating partition structure, which is installed in the stator slot and fixed to the pole shoe to insulatingly partition the internal space of the stator slot. The insulating separation structure includes a first partition plate extending radially and axially along the stator core, one end of which is fixed to the pole shoe; The insulating separation structure further includes a second separation plate that is intersected with the first separation plate. The pole shoe has a slot on the side facing the first separation plate. The portion of the first separation plate located on the second separation plate facing the pole shoe is inserted into the slot. The second separation plate is located on the side of the pole shoe facing the yoke. The first partition plate and the second partition plate are arranged perpendicularly, and in the width direction of the stator slot, the length of the second partition plate on both sides of the first partition plate is equal.

2. The stator core according to claim 1, characterized in that, The thickness A1 of the second partition plate is within the range of 0.2mm < A1 ≤ 0.35mm; and / or the distance D1 between the second partition plate and the stator tooth is within the range of 0 ≤ D1 < 0.25mm.

3. The stator core according to claim 1, characterized in that, The thickness A2 of the first partition plate has a range of 0.2mm < A2 < 1mm; the distance D2 between the first partition plate and the bottom edge of the stator slot has a range of 0 < D2 < 0.1mm.

4. The stator core according to claim 1, characterized in that, The pole shoe has parallel inner and outer end edges of the slot, and the second partition plate is fitted to the inner end edge of the slot; the distance d1 between the axis of the stator core and the outer end edge of the slot satisfies: R≤d1≤1.02R; and / or, the distance d2 between the axis of the stator core and the inner end edge of the slot satisfies 1.02R<d2<1.07R; where R is the radius of the inner diameter of the stator core.

5. The stator core according to claim 4, characterized in that, In the axial direction of the stator core, the length of the pole shoe is equal to the length of the stator core, and at least one end of the first partition plate has an extension extending out of the pole shoe; the extension length L of the extension satisfies: 3mm≤L≤H, where H is the height of the stator coil corresponding to the end of the first partition plate extending out; and / or, the extension has a snap-fit ​​portion extending radially inward along the stator core to engage with the end of the pole shoe, and the distance S1 between the end of the snap-fit ​​portion and the second partition plate satisfies: S1<(d2-d1).

6. The stator core according to claim 5, characterized in that, The width of the outer edge of the slot is B1. The side of the pole shoe away from the yoke is provided with a transition arc segment near both ends. The distance between the two transition arc segments is B2, and B1≤B2; and / or, the side of the pole shoe is parallel to the inner wall of the stator slot, and the distance D3 between the side of the pole shoe and the inner wall of the stator slot is in the range of 0<D3≤0.2mm.

7. The stator core according to claim 1, characterized in that, In the width direction of the stator slot; at least one end of the pole shoe is provided with a positioning boss, and the stator tooth is provided with a groove adapted to the positioning boss; and / or, at least one end of the pole shoe is provided with a groove, and the stator tooth is provided with a positioning boss adapted to the groove.

8. A stator assembly, characterized in that, The stator assembly includes stator windings and a stator core as described in any one of claims 1-7, wherein the stator windings are sleeved on the stator teeth, and when the stator core includes an insulating separation structure, the insulating separation structure is clamped between two adjacent stator windings.

9. An electric motor, characterized in that, The motor includes the stator assembly as described in claim 8.

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