Stator punching sheet, stator core, motor stator and permanent magnet motor
By optimizing the dimensional parameters of the stator laminations and using a larger stator slot structure, and by employing enameled aluminum wire for winding, the problem of high motor material costs was solved, achieving cost reduction and performance assurance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-04
- Publication Date
- 2026-03-10
AI Technical Summary
Existing technologies have high costs for motor materials, especially enameled wire, which accounts for a large proportion of the cost and is difficult to reduce further.
The stator lamination dimensions are designed to be 0.065≤L1*L3/(R2^2-R1^2)≤0.085. Larger stator slots and stator tooth structures are adopted, and enameled wire with higher resistivity, such as enameled aluminum wire, is used for winding to reduce the use of copper wire.
This reduces the cost of motor materials while ensuring the motor's performance and safety, avoiding problems such as excessive heat generation and iron loss caused by excessive current density.
Smart Images
Figure CN121643283A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of electric machines, in particular to a stator lamination, a stator core, a motor stator and a permanent magnet motor. BACKGROUND
[0002] Electric machines are increasingly widely used in people's daily production and life, and reducing the material cost of electric machines has been the direction of efforts of researchers in the field. Electric machines are mainly composed of enameled wire, magnet, silicon steel and other materials. The enameled wire mainly uses copper wire, and the cost of copper wire accounts for 30-40% of the material cost of electric machines.
[0003] At present, the electric machines in the related art mainly improve the performance-price ratio by reducing the cost of magnets and silicon steel, and do not consider reducing the cost of enameled wire. In the case where the cost of other main materials has been reduced to the extreme, it is difficult to further reduce the material cost of electric machines. SUMMARY
[0004] The main purpose of the present application is to provide a stator lamination, a stator core, a motor stator and a permanent magnet motor to solve the technical problem of high material cost of electric machines in the related art.
[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a stator lamination is provided, which comprises: a body portion, the body portion being an annular structure; a plurality of stator teeth, each stator tooth being arranged inside the annular structure and connected with the inner wall surface of the annular structure, the plurality of stator teeth being arranged in sequence and spaced apart along the circumferential direction of the annular structure, and a stator slot for winding a stator winding being formed between any two adjacent stator teeth; wherein the stator lamination satisfies the following size requirements: 0.065≤L1*L3 / (R2^2-R1^2)≤0.085, L1 is the tooth width of the stator tooth, L3 is the depth of the stator slot, R1 is the radius of the inscribed circle of the stator lamination, and R2 is the radius of the circumscribed circle of the stator lamination.
[0006] Further, the stator lamination also satisfies the following size requirements: 7.0≤L1*L3 / ((R2^2-R1^2)*Z)≤9.5, wherein Z is the number of stator slots on the stator lamination.
[0007] Further, 24.5mm≤R1≤26.5mm, 48mm≤R2≤54mm.
[0008] Further, 16mm≤L3≤21mm, wherein L3=R2-R1-L2, and L2 is the yoke thickness of the stator lamination.
[0009] Further, the side of the stator slot facing the center of the stator lamination has a stator slot opening arranged in a tapered manner, and the width of the stator slot opening is L4, wherein 2.8mm≤L4≤3.0mm.
[0010] According to another aspect of the present application, there is provided a stator core comprising a plurality of stator laminations arranged in a stack, wherein the stator laminations are the above-mentioned stator laminations.
[0011] According to another aspect of the present application, there is provided an electric machine stator comprising: a stator core, which is the above-mentioned stator core; and a stator winding, at least a portion of which is arranged in the stator slots of each stator lamination of the stator core.
[0012] Further, the stator winding is formed by winding an enameled aluminum wire.
[0013] According to another aspect of the present application, there is provided a permanent magnet electric machine, the stator of which is the above-mentioned electric machine stator.
[0014] Further, the permanent magnet electric machine has a maximum rotational speed in a range of 170 rps to 200 rps when in operation.
[0015] The stator lamination of the technical solution of the application comprises: a body part, the body part is a ring structure; a plurality of stator teeth, each stator tooth is arranged inside the ring structure and connected with the inner wall surface of the ring structure, the plurality of stator teeth are sequentially and spacedly arranged along the circumference of the ring structure, and a stator slot for winding a stator winding is formed between any two adjacent stator teeth; wherein the stator lamination satisfies the following size requirement: 0.065≤L1*L3 / (R2^2-R1^2)≤0.085, L1 is the tooth width of the stator tooth, L3 is the depth of the stator slot, R1 is the radius of the inscribed circle of the stator lamination, and R2 is the radius of the circumscribed circle of the stator lamination. Wherein L1*L3 is related to the area of the non-winding part, R2^2-R1^2 is related to the surface area of the stator lamination, and the ratio of the two can indicate the size of the area occupied by the non-winding part in the area of the stator lamination, and indirectly indicate the size of the winding area. In the embodiment of the application, the value of L1*L3 / (R2^2-R1^2) is designed to be less than or equal to 0.085. Compared with the stator lamination in the related art, the area occupied by the non-winding part is smaller, and therefore the area of the stator lamination for winding is larger. The stator lamination with this structure design can use a wire with a larger resistivity for winding when a plurality of stator laminations are stacked in actual use, for example, a lacquered aluminum wire is used to wind the winding. Since a larger stator slot is designed on the stator lamination, a lacquered wire with a larger diameter can be used to wind the winding. Even if the resistivity of the lacquered wire is larger, the current density of the winding formed can also be ensured not to exceed the standard, avoiding the situation that the winding is burned out due to excessive heat caused by excessive current density. Moreover, in the embodiment of the application, the value of L1*L3 / (R2^2-R1^2) is set to be greater than or equal to 0.065, that is, the lower limit of the area occupied by the non-winding part. Therefore, the area occupied by the stator slot is not too large, thereby avoiding the situation that the motor has excessive iron loss and insufficient rigidity due to the stator slot being too large, and ensuring that the motor has good performance. The stator lamination with the above structure design in the application is designed by setting the parameter L1*L3 / (R2^2-R1^2) of the stator lamination to a value range of 0.065 to 0.085. When the motor is manufactured, a lacquered wire with a larger resistivity can be used, and the performance of the motor can be ensured. This is conducive to reducing or avoiding the use of copper wire, thereby reducing the cost of the motor, and solving the technical problem of high material cost of the motor in the related art. BRIEF DESCRIPTION OF DRAWINGS
[0016] The drawings constituting a part of the specification of the application serve to provide a further understanding of the application, and the illustrative embodiments of the application and the description thereof serve to explain the application, and do not constitute an improper limitation on the application. In the drawings:
[0017] Figure 1 The structure schematic diagram of the embodiment of the stator lamination of the application;
[0018] Figure 2 Fig. 1 is a schematic diagram of a comparison of parameters, performance and current density of an embodiment of the permanent magnet motor of the present application and a permanent magnet motor in the related art;
[0019] Figure 3 Fig. 2 is a schematic diagram of a comparison of parameters, performance and current density of an embodiment of the permanent magnet motor of the present application and a permanent magnet motor in the related art;
[0020] In the above drawings, the following reference signs are used:
[0021] 1, body part; 2, stator tooth; 3, stator slot; 31, stator slot opening. DETAILED DESCRIPTION
[0022] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.
[0023] Reference should be made to Figure 1 In order to reduce the material cost of the motor, an embodiment of the present application provides a stator lamination, which comprises: a body part 1, the body part 1 being a ring structure; a plurality of stator teeth 2, each stator tooth 2 being arranged inside the ring structure and connected with the inner wall surface of the ring structure, the plurality of stator teeth 2 being arranged in sequence and spaced apart along the circumferential direction of the ring structure, and a stator slot 3 for winding a stator winding being formed between any two adjacent stator teeth 2; wherein the stator lamination satisfies the following size requirement: 0.065≤L1*L3 / (R2^2-R1^2)≤0.085, L1 is the tooth width of the stator tooth 2, L3 is the depth of the stator slot 3, R1 is the radius of the inscribed circle of the stator lamination, and R2 is the radius of the circumscribed circle of the stator lamination.
[0024] L1*L3 is related to the area of the non-winding part, R2^2-R1^2 is related to the surface area of the stator sheet, and the ratio of the two can indicate the size of the area occupied by the non-winding part relative to the area of the stator sheet, and indirectly indicate the size of the winding area. In the embodiment of the application, the value of L1*L3 / (R2^2-R1^2) is designed to be less than or equal to 0.085. Compared with the stator sheet in the related art, the area occupied by the non-winding part is smaller, and therefore the area of the stator sheet used for winding is larger. When the stator sheet with this structure is used in practice, a wire with a larger resistivity can be used to wind the stator sheet after stacking a plurality of stator sheets. For example, a lacquered aluminum wire is used to wind the stator sheet. Because a larger stator slot 3 is designed on the stator sheet, a lacquered wire with a larger diameter can be used to wind the stator sheet. Even if the resistivity of the lacquered wire is large, the current density of the winding formed by the lacquered wire can still be ensured to be within a normal range, and the situation that the winding is burned out due to excessive heat caused by excessive current density can be avoided. Moreover, in the embodiment of the application, the value of L1*L3 / (R2^2-R1^2) is designed to be greater than or equal to 0.065, that is, the lower limit of the area occupied by the non-winding part. Therefore, the area occupied by the stator slot 3 is not too large, so that the situation that the motor has excessive iron loss and insufficient rigidity due to the excessive stator slot 3 can be avoided, and the motor has good performance. The stator sheet with the above structure designed in the application can be used to design the parameter L1*L3 / (R2^2-R1^2) of the stator sheet to be within the range of 0.065 to 0.085. When the motor is manufactured, a lacquered wire with a larger resistivity can be used, and the performance of the motor can be ensured. This is conducive to reducing or avoiding the use of copper wire, thereby reducing the cost of the motor, and solving the technical problem of high material cost of the motor in the related art.
[0025] It should be noted that the units of L1, L3, R2, and R1 should correspond, for example, all in mm or all in cm.
[0026] Specifically, the stator sheet also satisfies the following size requirement: 7.0≤L1*L3 / ((R2^2-R1^2)*Z)≤9.5, where Z is the number of stator slots 3 on the stator sheet.
[0027] In actual implementation, the slot pole number ratio of the stator lamination also has a certain influence on the area of the stator slot 3, that is, the more the slot pole number, the larger the area of the non-winding part, and correspondingly, the smaller the winding area. When the winding is wound with the enameled wire with greater resistivity, the current density of the winding will also be greater. In the embodiment, by introducing the number Z of the stator slot 3, the value range of L1*L3 / ((R2^2-R1^2)*Z) is limited, and the influence of the number Z of the stator slot 3 is also considered. Specifically, in the embodiment, the value range of L1*L3 / ((R2^2-R1^2)*Z) is designed to be 7.0 to 9.5, and on the basis of considering the number of the stator slot 3, it is ensured that the stator lamination has a larger slot area than the stator lamination in the related art, so that a larger-diameter enameled wire can be used, and it is ensured that even if the enameled wire has a larger resistivity, the current density will not exceed the standard, and in addition, the slot area will not be too large, so as to ensure that the iron loss will not be too large. When the stator lamination designed with such parameters is used for the motor material, the enameled wire with a larger resistivity can be used to replace the enameled copper wire on the basis of ensuring the performance of the motor, so as to reduce the material cost of the motor.
[0028] In the embodiment, the overall size of the stator lamination is designed, the value range of the inscribed circle radius R1 of the stator lamination is designed to be 24.5mm to 26.5mm, and the value range of the radius R2 of the circumscribed circle of the stator lamination is designed to be 48mm to 54mm. After the stator lamination in this structure size range is wound with the enameled wire material with a larger resistivity, the motor can have better performance, so as to effectively control the material cost of the motor without affecting the performance of the motor.
[0029] In a specific embodiment, 16mm≤L3≤21mm, where L3=R2-R1-L2, and L2 is the yoke thickness of the stator lamination.
[0030] On the basis of the above-mentioned R1 and R2 size design, in the embodiment, the value of L3 is further designed, specifically, the value range of L3 is designed to be 16mm to 21mm, as Figure 1As shown, L3 is the depth of the stator slot 3 of the stator lamination. The larger the value, the larger the area of the stator slot 3, which is more conducive to using enameled wire with higher resistivity instead of enameled copper wire. In this embodiment, L3 is designed to be greater than or equal to 16mm, which can well achieve the above-mentioned functions. In addition, this embodiment also limits the maximum size of L3 to less than or equal to 21mm. On the one hand, it can avoid the stator slot 3 area being too large, which would lead to excessive iron loss in the manufactured motor and thus affect the motor performance. On the other hand, since L3 = R2 - R1 - L2, the size of L3 is directly related to the size of L2. The larger L3 is, the smaller the yoke thickness L2 of the stator lamination. By limiting the maximum value of L3 to 21mm, the applicant ensures that the yoke thickness L2 is not too small, which is conducive to ensuring the rigidity of the stator. The better the stator rigidity, the lower the noise of the manufactured motor during operation. Therefore, the size structure design of 16mm≤L3≤21mm can effectively balance motor performance and motor noise.
[0031] Specifically, the stator slot 3 has a narrowed stator slot opening 31 on the side facing the center of the stator lamination, and the width of the stator slot opening 31 is L4, wherein 2.8mm≤L4≤3.0mm.
[0032] like Figure 1 As shown, the stator slot 3 has a stator slot opening 31 near the center of the stator lamination. The stator slot opening 31 is narrower than other parts of the stator slot 3, i.e., the stator slot opening 31 is a constricted structure with a width of L4. During the motor manufacturing process, the enameled wire needs to be wound into the stator slot 3 through this stator slot opening 31 to form a winding. In this embodiment, the width L4 of the stator slot opening 31 is designed to be greater than or equal to 2.8mm. Compared with the slot openings of stator laminations in related technologies, the stator slot opening 31 of the stator lamination in this embodiment has a larger width. Therefore, during the winding process, a thicker diameter enameled wire can be wound into the stator slot 3, so even if the resistivity of the wire is high, the current density can be kept within the limit as long as the wire diameter is large enough. In addition, this embodiment also designs an upper limit for the width L4 of the stator slot 31 of the stator lamination, L4≤3.0mm. This can avoid the situation where the cogging torque is too large due to the excessive width of the stator slot 31, which would lead to the deterioration of motor noise and is beneficial to motor noise control.
[0033] Secondly, embodiments of the present invention provide a stator core, the stator core comprising a plurality of stacked stator laminations, wherein the stator laminations are those described above.
[0034] The stator core of this embodiment is formed by stacking the stator laminations described above. Since the parameter L1*L3 / (R2^2-R1^2) of the stator laminations has been designed to range from 0.065 to 0.085, a larger diameter enameled wire can be used to wind the windings. Even if the resistivity of the enameled wire is relatively high, the current density of the winding formed by winding can be guaranteed not to exceed the standard, avoiding the situation where excessive heat is caused by excessive current density and thus burns out the windings. This also ensures the performance of the motor and helps to reduce or avoid the use of copper wire, thereby reducing the cost of the motor and solving the technical problem of excessively high motor material costs in related technologies.
[0035] In addition, embodiments of the present invention provide a motor stator, the motor stator comprising: a stator core, the stator core being the stator core described above; and a stator winding, at least a portion of the stator winding being disposed within the stator slots 3 of each stator lamination of the stator core.
[0036] The motor stator in this embodiment includes a stator core and a stator winding. The stator core is the stator core described above. The stator laminations of the stator core are specially designed to satisfy the condition 0.065≤L1*L3 / (R2^2-R1^2)≤0.085. Therefore, the stator core has a larger winding space, and the stator winding can be wound with wires of larger diameter. Even if the resistivity of the enameled wire is relatively high, the current density of the winding formed by the winding can be guaranteed not to exceed the standard, avoiding the situation where the winding is burned out due to excessive heat caused by excessive current density. This also ensures the performance of the motor and helps to reduce or avoid the use of copper wire, thereby reducing the cost of the motor and solving the technical problem of excessively high motor material costs in related technologies.
[0037] In this embodiment, enameled aluminum wire is used instead of enameled copper wire for winding. Because aluminum wire has a higher resistivity, directly applying it to the stator in related technologies would lead to excessive current density, resulting in severe overheating and burnout of the stator windings. However, the stator in this embodiment uses the aforementioned parameter design (0.065≤L1*L3 / (R2^2-R1^2)≤0.085), thus providing more winding space in the stator core. Larger diameter wires can be used for winding, ensuring that the current density of the winding does not exceed the limit, even with the higher resistivity of the enameled wire. This avoids excessive overheating and burnout due to excessive current density. Furthermore, enameled aluminum wire has a significant cost advantage over enameled copper wire, greatly reducing the material cost of the motor stator and solving the problem of excessively high manufacturing costs in related technologies.
[0038] In this embodiment, the motor stator winding is a concentrated winding. Based on the above-mentioned dimensional parameters, the motor stator with concentrated winding can well meet the current density requirements and motor performance requirements by using enameled aluminum wire, thus balancing the cost and performance of the motor.
[0039] Finally, an embodiment of the present invention provides a permanent magnet motor, wherein the stator of the permanent magnet motor adopts the motor stator described above.
[0040] The permanent magnet motor in this embodiment uses the aforementioned motor stator. As such, the stator laminations of this motor stator have undergone a special design, namely 0.065≤L1*L3 / (R2^2-R1^2)≤0.085. Therefore, the stator core has a larger winding space, and the stator winding can be wound with wires of larger diameter. Even if the resistivity of the enameled wire is relatively high, it can ensure that the winding current density formed by the winding does not exceed the standard, avoiding the situation where the winding burns out due to excessive heat caused by excessive current density. It can also ensure the performance of the motor, which is conducive to reducing or avoiding the use of copper wire, thereby reducing the cost of the motor and solving the technical problem of excessively high motor material costs in related technologies.
[0041] Specifically, the maximum speed of the permanent magnet motor during operation ranges from 170 rpm to 200 rpm.
[0042] In other words, the design in this embodiment is a high-speed motor with high-speed function. Practice has proven that permanent magnet motors with the highest speed in this range can use enameled aluminum wire instead of enameled copper wire based on the above-mentioned structural parameters, and this has almost no impact on the current density and working performance of the motor. Thus, the material cost of the motor can be effectively reduced without affecting the motor performance, and it has a good prospect for practical application.
[0043] like Figure 2 and Figure 3 As shown, Figure 2 This is a schematic diagram comparing the parameters, performance, and current density of an embodiment of the permanent magnet motor of the present invention with those of permanent magnet motors in related technologies. Figure 3 This is a schematic diagram comparing the parameters, i.e., the natural frequency, of a permanent magnet motor embodiment of the present invention with those of a permanent magnet motor in related technologies. Figure 2 and Figure 3 In the original scheme, the motor using enameled copper wire is represented in the related technology. New schemes 1 and 2 are motors using enameled aluminum wire in the embodiments of this application. Figure 2As shown in the figure, item a is L1*L3 / (R2^2-R1^2), the original scheme is 0.095, the new scheme 1 is 0.065, and the new scheme 2 is 0.085; item b is the motor performance, in this embodiment it is the performance test result of GB60Hz under rated test conditions, the original scheme is 90.80, the new scheme 1 is 90.39, and the new scheme 2 is 90.14. It can be seen that after using enameled aluminum wire to reduce costs, the change in motor performance is small, so using aluminum wire will hardly have an adverse effect on motor performance; item c is the current density, the original scheme is 10.5, the new scheme 1 is 8.9, and the new scheme 2 is 10. It can be seen that after using enameled aluminum wire to reduce costs, the current density of the motor is reduced to a certain extent, so the motor heat control is better, and there is no risk of motor overheating and burning out. Figure 3 As shown in the figure, item d is the value of L3, which is 14.8 in the original scheme, 21 in the new scheme 1, and 16 in the new scheme 2. Item e is the natural frequency of the motor, which is 3339 in the original scheme, 3256 in the new scheme 1, and 3328 in the new scheme 2. It can be seen that after adopting the design scheme of the embodiment of this application, the natural frequency of the motor can be controlled within a range close to that of the original scheme, thereby avoiding resonance between the motor and related components and ensuring the smooth operation of the motor.
[0044] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:
[0045] The stator lamination of an embodiment of the present invention includes: a body portion 1, which is an annular structure; a plurality of stator teeth 2, each stator tooth 2 being disposed inside the annular structure and connected to the inner wall surface of the annular structure, the plurality of stator teeth 2 being arranged sequentially at intervals along the circumference of the annular structure, and a stator slot 3 for winding the stator winding being formed between any two adjacent stator teeth 2; wherein, the stator lamination satisfies the following dimensional requirements: 0.065≤L1*L3 / (R2^2-R1^2)≤0.085, where L1 is the tooth width of the stator tooth 2, L3 is the depth of the stator slot 3, R1 is the radius of the inscribed circle of the stator lamination, and R2 is the radius of the circumscribed circle of the stator lamination. Wherein, L1*L3 is related to the area of the non-winding part, and R2^2-R1^2 is related to the surface area of the stator lamination. The ratio of the two can indicate the size of the area of the non-winding part relative to the area of the stator lamination, and indirectly indicate the size of the winding area. In this embodiment, the value of L1*L3 / (R2^2-R1^2) is designed to be less than or equal to 0.085. Compared with the stator laminations in related technologies, the area occupied by the non-winding part is smaller. Therefore, the area of the stator lamination used for winding is larger. When using stator laminations with this structural design, multiple stator laminations can be stacked in actual use, and enameled wire with higher resistivity can be used for winding. For example, enameled aluminum wire can be used to wind the winding. Since a larger stator slot 3 is designed on the stator lamination, enameled wire with a larger diameter can be used to wind the winding. Even if the resistivity of the enameled wire is large, it can be ensured that the current density of the winding formed by winding does not exceed the standard, avoiding the situation where the winding is burned out due to excessive heat caused by excessive current density. Furthermore, in this embodiment, the value of L1*L3 / (R2^2-R1^2) is designed to be greater than or equal to 0.065, which is the lower limit of the area occupied by the non-wound portion. Therefore, the area occupied by the stator slot 3 will not be too large, thus avoiding excessive iron loss and insufficient rigidity of the motor due to excessively large stator slot 3, and ensuring that the motor has good performance. The stator lamination embodiment of this application, which adopts the above-mentioned structural design, designs the parameter L1*L3 / (R2^2-R1^2) of the stator lamination to a value range of 0.065 to 0.085. This allows the use of enameled wire with higher resistivity during motor manufacturing, while ensuring motor performance. It also helps to reduce or avoid the use of copper wire, thereby reducing motor cost and solving the technical problem of excessively high motor material cost in related technologies.
[0046] 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.
[0047] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0048] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.
[0049] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A stator lamination characterized by, The stator lamination comprises: a body part (1) in a ring structure; a plurality of stator teeth (2), each of which is arranged inside the ring structure and connected with the inner wall surface of the ring structure, and a plurality of stator teeth (2) are sequentially and spaced apart along the circumference of the ring structure, and a stator slot (3) for winding a stator winding is formed between any two adjacent stator teeth (2). Wherein, the stator lamination satisfies the following size requirements: 0.065≤L1*L3 / (R2^2-R1^2)≤0.085, L1 is the tooth width of the stator tooth (2), L3 is the depth of the stator slot (3), R1 is the radius of the inscribed circle of the stator lamination, and R2 is the radius of the circumscribed circle of the stator lamination.
2. The stator lamination of claim 1, wherein, The stator lamination also satisfies the following size requirements: 7.0≤L1*L3 / ((R2^2-R1^2)*Z)≤9.5, wherein Z is the number of stator slots (3) on the stator lamination.
3. A stator lamination according to claim 1 or 2, characterised in that 24.5mm≤R1≤26.5mm, 48mm≤R2≤54mm.
4. A stator lamination according to claim 3, characterised in that 16mm≤L3≤21mm, wherein L3=R2-R1-L2, L2 is the yoke thickness of the stator lamination.
5. A stator lamination according to claim 1 or 2, characterized in that The stator slot (3) has a stator slot opening (31) arranged at the side towards the center of the stator lamination, and the width of the stator slot opening (31) is L4, wherein 2.8mm≤L4≤3.0mm.
6. A stator core characterized by, The stator core comprises a plurality of stacked stator laminations, wherein the stator lamination is any one of the stator laminations of claims 1-5.
7. An electric machine stator, characterized by The motor stator comprises: a stator core according to claim 6; a stator winding, at least part of which is arranged in the stator slot (3) of each stator lamination of the stator core.
8. The motor stator of claim 7, wherein, The stator winding is formed by winding a lacquered aluminum wire.
9. A permanent magnet electric machine characterized by, The stator of the permanent magnet motor adopts the motor stator of any one of claims 7-8.
10. The permanent magnet electric machine of claim 9, wherein, The maximum rotational speed of the permanent magnet motor when working is in the range of 170rps to 200rps.