Stator punching sheet, stator core, stator structure and permanent magnet motor
By optimizing the stator lamination design and using enameled aluminum wire with higher resistivity, the problem of high motor material costs was solved, thus ensuring motor performance and reducing costs.
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 motor material costs, which are difficult to further reduce by cutting the costs of magnets and silicon steel. The high cost of enameled wire has not been effectively addressed.
The stator lamination design is adopted to increase the ratio of slot area to stator outer diameter (S1/L1). Enamelled aluminum wire with higher resistivity is used instead of copper wire for winding. The slot parameters and the number of stator slots are controlled to ensure current density and temperature rise control.
This effectively reduces the cost of motor materials while ensuring motor performance, avoiding iron loss and insufficient rigidity caused by excessively large slots, and reducing the amount of copper wire used.
Smart Images
Figure CN121643282A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of motor design, and more specifically, to a stator lamination, a stator core, a stator structure, and a permanent magnet motor. Background Technology
[0002] The main structure of an electric motor includes enameled wire, magnets, silicon steel, and other materials. Currently, the enameled wire in existing motors is primarily copper wire, which accounts for 30% to 40% of the motor's material cost. Therefore, replacing copper wire with other materials could effectively reduce the motor's production cost. However, current motor technologies primarily improve cost-effectiveness by reducing the cost of magnets and silicon steel, without considering cost reduction in the enameled wire. This makes it difficult to further reduce the motor's material cost, resulting in persistently high material costs. Summary of the Invention
[0003] The main objective of this invention is to provide a stator lamination, stator core, stator structure, and permanent magnet motor to solve the technical problem of high material cost in motors in related technologies.
[0004] To achieve the above objectives, according to one aspect of the present invention, a stator lamination is provided, comprising: a body portion having an annular structure; a plurality of stator teeth, each stator tooth being disposed inside the annular structure and connected to the inner wall surface of the annular structure, the plurality of stator teeth being sequentially spaced along the circumference 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 dimensional requirement: 2.1≤S1 / L1≤2.8, S1 being the projected area of a single stator slot in a preset plane, wherein the preset plane is any plane perpendicular to the thickness direction of the stator lamination, and L1 being the diameter of the circumscribed circle of the stator lamination.
[0005] Furthermore, the stator laminations also meet the following dimensional requirements: 0.40≤L3 / L2≤0.45, wherein each stator slot has a constricted opening, each opening is oriented toward the center of the stator lamination, L2 is the width of the opening, and L3 is the depth of the opening.
[0006] Furthermore, the stator laminations also meet the following dimensional requirements: 0.230≤S1 / (L1*Z)≤0.300, where Z is the number of stator slots on the stator laminations.
[0007] Furthermore, 220mm 2 ≤S1≤280mm 2 , 96mm≤L1≤108mm.
[0008] According to another aspect of the present invention, a stator core is provided, the stator core comprising a plurality of stator laminations stacked sequentially, wherein the stator laminations are those described above.
[0009] According to another aspect of the present invention, a stator structure is provided, comprising: the stator core described above; and a stator winding wound around the stator core, at least a portion of which is located within stator slots of stator laminations of the stator core.
[0010] Furthermore, the stator winding is formed by winding enameled aluminum wire.
[0011] Furthermore, the stator winding is connected in a delta configuration, and the diameter of the enameled aluminum wire is selected from 0.6mm to 0.9mm.
[0012] Furthermore, the stator winding is connected in a star configuration, and the diameter of the enameled aluminum wire is selected from 0.75mm to 1.2mm.
[0013] According to another aspect of the present invention, a permanent magnet motor is provided, wherein the stator of the permanent magnet motor adopts the stator structure described above.
[0014] The stator lamination using the technical solution of this invention includes: a body portion, which is an annular structure; and multiple stator teeth, each stator tooth being disposed inside the annular structure and connected to the inner wall surface of the annular structure. The multiple stator teeth are sequentially spaced along the circumference of the annular structure, and a stator slot for winding the stator winding is formed between any two adjacent stator teeth. The stator lamination satisfies the following dimensional requirements: 2.1 ≤ S1 / L1 ≤ 2.8, where S1 is the projected area of a single stator slot in a preset plane, and the preset plane is any plane perpendicular to the thickness direction of the stator lamination; L1 is the diameter of the circumcircle of the stator lamination. S1 / L1 is the ratio of the slot area to the stator outer diameter. When the stator outer diameter is constant, a larger slot area allows for more wire to be wound around the stator core or the use of a larger wire diameter. In this embodiment, the value of S1 / L1 is designed to be greater than or equal to 2.1. Compared with stator laminations in related technologies, this provides a larger slot area. Therefore, after the stator laminations are stacked into a stator core, a larger wire diameter can be wound. Even if the resistivity of the wire is relatively high, the requirements for current density not exceeding the limit and winding temperature rise control can still be met. With this structural design, materials with higher resistivity can be used instead of enameled copper wire for winding, thereby helping to reduce the material cost of the motor. In addition, the stator laminations in this embodiment also control the value of S1 / L1 to be less than or equal to 2.8. That is to say, the area of the stator slots will not be too large, thus avoiding the situation where the motor iron loss is too large and the rigidity is insufficient due to the stator slots being too large, ensuring that the motor has better performance. The stator laminations with the above-mentioned structural design allow the use of enameled wire with higher resistivity instead of enameled copper wire when manufacturing motors. This enables the motor to meet the requirements for current density and winding temperature rise control, ensuring motor performance. It also helps to reduce or avoid the use of copper wire, thereby reducing motor costs and solving the technical problem of excessively high motor material costs in related technologies. Attached Figure Description
[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:
[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the stator lamination of the present invention;
[0017] Figure 2 This is a schematic diagram comparing the parameters, current density, cost, and performance of the permanent magnet motor embodiment of the present invention with those of permanent magnet motors in related technologies.
[0018] Figure 3 This is a schematic diagram comparing the parameters and cogging torque of a permanent magnet motor embodiment of the present invention with those of permanent magnet motors in related technologies.
[0019] The above figures include the following reference numerals:
[0020] 1. Body section; 2. Stator teeth; 3. Stator slot; 31. Slot opening. Detailed Implementation
[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0022] like Figure 1 As shown, in order to reduce the material cost of the motor, an embodiment of the present invention provides a stator lamination, which includes: a body part 1, the body part 1 being 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 meets the following dimensional requirements: 2.1≤S1 / L1≤2.8, S1 being the projected area of a single stator slot 3 in a preset plane, wherein the preset plane is any plane perpendicular to the thickness direction of the stator lamination, and L1 being the diameter of the circumcircle of the stator lamination.
[0023] S1 / L1 is the ratio of the slot area to the stator outer diameter. With a fixed stator outer diameter, a larger slot area allows for more wire to be wound around the stator core, or the use of larger wire diameters. In this embodiment, the value of S1 / L1 is designed to be greater than or equal to 2.1. Compared to stator laminations in related technologies, this provides a larger slot area. Therefore, after the stator laminations are stacked to form the stator core, a larger wire diameter can be wound. Even if the resistivity of the wire is high, the requirements for current density not exceeding the limit and winding temperature rise control can be met. With this structural design, materials with higher resistivity can be used instead of enameled copper wire for winding, thereby reducing the material cost of the motor. Furthermore, the stator laminations in this embodiment also control the value of S1 / L1 to be less than or equal to 2.8. This means that the area of the stator slot 3 will not be too large, thus avoiding excessive iron loss and insufficient rigidity in the motor due to an excessively large stator slot 3, ensuring better motor performance. The stator laminations with the above-mentioned structural design allow the use of enameled wire with higher resistivity instead of enameled copper wire when manufacturing motors. This enables the motor to meet the requirements for current density and winding temperature rise control, ensuring motor performance. It also helps to reduce or avoid the use of copper wire, thereby reducing motor costs and solving the technical problem of excessively high motor material costs in related technologies.
[0024] During the calculation, it is necessary to ensure the correspondence between the units of S1 and L1. For example, when the unit of S1 is mm... 2 When L1 is in mm, the unit must be mm; when S1 is in cm.2 In this case, the unit of L1 needs to be cm.
[0025] The stator laminations also meet the following dimensional requirements: 0.40≤L3 / L2≤0.45, wherein each stator slot 3 has a constricted slot 31, and each slot 31 is set towards the center of the stator lamination, L2 is the width of the slot 31, and L3 is the depth of the slot 31.
[0026] In this embodiment, the range of the depth-to-width ratio of the slot 31 is designed, specifically, 0.40≤L3 / L2≤0.45. As described above, the embodiments of this application aim to design the structural parameters of the stator laminations so that the motor can use wires of other materials instead of copper wires for winding. When other wires are used for winding, the resistivity of the wires increases, and the required wire diameter is larger than that of copper wires. This application designs the dimensional parameters of the slot 31 so that L3 / L2≤0.45, thereby giving the stator laminations of this embodiment a larger slot width compared to stator laminations in related technologies, thus ensuring smooth winding. In addition, the design of 0.40≤L3 / L2, i.e., limiting the slot width, avoids the situation where excessive slot width leads to excessive cogging torque and deterioration of motor noise, which is beneficial to motor noise control.
[0027] Similarly, the units of L3 and L2 must also correspond, that is, the units of the two must be the same.
[0028] Specifically, the stator laminations also meet the following dimensional requirements: 0.230≤S1 / (L1*Z)≤0.300, where Z is the number of stator slots 3 on the stator laminations.
[0029] In practical implementation, the number of stator slots 3 on the stator laminations is also an important design parameter. Specifically, since the outer diameter (circumscribed circle diameter) of the stator laminations is fixed, the number of stator slots 3 cannot be too large in order to ensure the above-mentioned S1 / L1 requirement. Otherwise, the area of a single stator slot 3 will be difficult to meet the above requirements. Therefore, this embodiment introduces the number Z of stator slots 3 and further controls it to 0.230≤S1 / (L1*Z). In addition, the number of stator slots 3 is not necessarily better the less the better. The fewer the number of stator slots 3, the fewer poles the motor will have, and the worse the magnet's anti-demagnetization ability will be. Therefore, in order to meet the demagnetization requirements, the thickness of the magnets used also needs to be greater. In this embodiment, in order to balance the amount of magnets used and thus control costs, S1 / (L1*Z) is further designed to be ≤0.300.
[0030] In this embodiment, the overall dimensions of the stator laminations were designed, and the area S1 of a single stator slot 3 was designed to be within the range of 220 mm. 2 ≤S1≤280mm 2The diameter of the circumscribed circle of the stator laminations is designed to be within the range of 96mm ≤ L1 ≤ 108mm. With the above structural design parameters, stator laminations within this size range can be wound using enameled wire with high resistivity, ensuring better motor performance and effectively controlling material costs without significantly affecting motor performance.
[0031] Secondly, embodiments of the present invention provide a stator core, the stator core comprising a plurality of stator laminations stacked sequentially, wherein the stator laminations are the stator laminations described above.
[0032] The stator core of this embodiment is formed by stacking multiple stator laminations as described above. By designing the structural parameters of the stator laminations, the value of S1 / L1 is designed to be greater than or equal to 2.1. Compared with stator laminations in related technologies, this results in a larger slot area. Therefore, after the stator laminations are stacked to form the stator core, a larger wire diameter can be wound. Even if the resistivity of the wire is relatively high, the requirements for current density not exceeding the standard and winding temperature rise control can still be met. With this structural design, materials with higher resistivity can be used instead of enameled copper wire for winding, thereby helping to reduce the material cost of the motor. In addition, the value of S1 / L1 of the stator laminations is controlled within the range of less than or equal to 2.8. That is to say, the area of the stator slot 3 will not be too large, thereby avoiding the situation where the motor iron loss is too large and the rigidity is insufficient due to the stator slot 3 being too large, ensuring that the motor has better performance. When manufacturing a motor, the iron core with the above-mentioned structural design allows the use of enameled wire with higher resistivity instead of enameled copper wire. It also enables the motor to meet the requirements for current density and winding temperature rise control, ensuring motor performance. This approach helps to reduce or avoid the use of copper wire, thereby reducing motor costs and solving the technical problem of excessively high motor material costs in related technologies.
[0033] In addition, embodiments of the present invention provide a stator structure, the stator structure comprising: the stator core described above; and a stator winding wound around the stator core, at least a portion of which is located within the stator slots 3 of each stator lamination of the stator core.
[0034] The stator structure of this invention includes the stator core and stator windings described above. The stator laminations of the stator core are specially designed so that 2.1≤S1 / L1≤2.8. With this structural design, the stator windings can use enameled wire with higher resistivity instead of enameled copper wire, while ensuring the performance of the motor. This 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] Preferably, the stator winding is formed by winding enameled aluminum wire. In this embodiment, enameled aluminum wire is used instead of enameled copper wire for winding. Since aluminum wire has a higher resistivity, directly applying aluminum wire to the stator of a motor in related technologies, as shown in the figure, would lead to excessive current density, resulting in severe overheating and burnout of the stator winding. However, the stator structure in this embodiment, due to the above-mentioned structural parameters, has a larger winding space in the stator core, and the stator winding can be wound with wire of a larger diameter. Even though the resistivity of the enameled wire is relatively high, it can ensure that the current density of the winding formed by winding does not exceed the standard, avoiding excessive overheating and burnout of the winding due to 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.
[0036] In one optional embodiment, the stator winding is connected in a delta configuration, and the diameter of the enameled aluminum wire is selected from 0.6 mm to 0.9 mm.
[0037] In this embodiment, the stator winding adopts a delta connection. In this case, the diameter of the enameled aluminum wire is selected from 0.6mm to 0.9mm. Using aluminum wire of this diameter can ensure the performance of the manufactured motor and ensure that the current density does not exceed the standard.
[0038] In another alternative embodiment, the stator winding is connected in a star configuration, and the diameter of the enameled aluminum wire is selected from 0.75 mm to 1.2 mm.
[0039] In actual implementation, the stator winding can also be connected in a star configuration. When a star configuration is used, the current in the stator winding wire will be relatively large. In order to ensure that the current density does not exceed the standard, the diameter of the enameled aluminum wire in this embodiment is designed to be selected from 0.75mm to 1.2mm.
[0040] 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.
[0041] Finally, embodiments of the present invention also provide a permanent magnet motor, wherein the stator of the permanent magnet motor adopts the stator structure described above.
[0042] The permanent magnet motor in this application adopts the stator structure described above. The stator laminations of this stator structure are specially designed so that 2.1 ≤ S1 / L1 ≤ 2.8. This provides a larger winding space for the stator core, allowing the stator windings to use larger diameter wires. Even with the high resistivity of the enameled wire, the current density of the windings remains within acceptable limits, preventing excessive heat generation and potential winding burnout due to excessive current density. This also ensures motor performance and helps reduce or eliminate the use of copper wire, thereby lowering motor costs and solving the technical problem of excessively high motor material costs in related technologies.
[0043] Specifically, the speed of the permanent magnet motor during operation is in the range of 10 rpm to 200 rpm.
[0044] Practice has proven that, based on the above-mentioned structural parameters, permanent magnet motors within this speed range can use enameled aluminum wire instead of enameled copper wire, with almost no impact on the motor's current density and operating performance. This effectively reduces the material cost of the motor without affecting its performance, demonstrating excellent practical application prospects.
[0045] like Figure 2 and Figure 3 As shown, Figure 2 This is a schematic diagram comparing the parameters, current density, cost, and performance of the permanent magnet motor embodiment of the present invention with those of permanent magnet motors in related technologies. Figure 3 This is a schematic diagram comparing the parameters and cogging torque of an embodiment of the permanent magnet motor of the present invention with those of permanent magnet motors 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, as described in the embodiments of this application. Figure 2 As shown in the figure, item a represents S1 / L1, which is 1.93 in the original scheme, 2.8 in the new scheme 1, and 2.1 in the new scheme 2; item b represents current density, which is 10.5 in the original scheme, 10.0 in the new scheme 1, and 8.9 in the new scheme 2. 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 burnout; item c represents cost, which is 81.06 in the original scheme, 60.9 in the new scheme 1, and 61.8 in the new scheme 2. It can be seen that after using enameled aluminum wire to replace copper wire, the motor cost is significantly reduced; item d represents performance, which in this embodiment is the performance test result of GB60Hz under rated test conditions. The original scheme is 90.8, the new scheme 1 is 90.14, and the new scheme 2 is 90.39. It can be seen that after using enameled aluminum wire to reduce costs, the change in motor performance is minimal, so using aluminum wire has almost no adverse effect on motor performance. Figure 3As shown in the figure, item e is L3 / L2, which is 0.47 in the original scheme, 0.45 in the new scheme 1, and 0.40 in the new scheme 2; item f is the cogging torque, which is 336 in the original scheme, 175 in the new scheme 1, and 256 in the new scheme 2. It can be seen that the cogging torque of the permanent magnet motor designed with the structural parameters of this application is significantly reduced compared with the schemes in related technologies, which is beneficial to better control noise.
[0046] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:
[0047] The stator lamination of an embodiment of the present invention includes: a body portion 1, which is an annular structure; and 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 are arranged sequentially at intervals along the circumference of the annular structure, and a stator slot 3 for winding the stator winding is formed between any two adjacent stator teeth 2. The stator lamination satisfies the following dimensional requirements: 2.1 ≤ S1 / L1 ≤ 2.8, where S1 is the projected area of a single stator slot 3 in a preset plane, and the preset plane is any plane perpendicular to the thickness direction of the stator lamination; L1 is the diameter of the circumcircle of the stator lamination. S1 / L1 is the ratio of the slot area to the stator outer diameter. When the stator outer diameter is constant, a larger slot area allows for more wire to be wound around the stator core or the use of a larger wire diameter. In this embodiment, the value of S1 / L1 is designed to be greater than or equal to 2.1. Compared with stator laminations in related technologies, this provides a larger slot area. Therefore, after the stator laminations are stacked into a stator core, a larger wire diameter can be wound. Even if the resistivity of the wire is relatively high, the requirements for current density not exceeding the limit and winding temperature rise control can still be met. With this structural design, materials with higher resistivity can be used instead of enameled copper wire for winding, thereby reducing the material cost of the motor. In addition, the stator laminations in this embodiment also control the value of S1 / L1 to be less than or equal to 2.8. That is to say, the area of stator slot 3 will not be too large, thus avoiding the situation where the motor iron loss is too large and the rigidity is insufficient due to the stator slot 3 being too large, ensuring that the motor has better performance. The stator laminations with the above-mentioned structural design allow the use of enameled wire with higher resistivity instead of enameled copper wire when manufacturing motors. This enables the motor to meet the requirements for current density and winding temperature rise control, ensuring motor performance. It also helps to reduce or avoid the use of copper wire, thereby reducing motor costs and solving the technical problem of excessively high motor material costs in related technologies.
[0048] 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.
[0049] 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.
[0050] 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.
[0051] 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, Comprising: a body part (1), the body part (1) being a ring structure; a plurality of stator teeth (2), each of the stator teeth (2) being arranged inside the ring structure and connected with an inner wall surface of the ring structure, the plurality of stator teeth (2) being arranged in sequence and spaced along a circumferential direction of the ring structure, and a stator slot (3) being formed between any two adjacent stator teeth (2) for winding a stator winding; wherein the stator lamination satisfies the following size requirement: 2.1≤S1 / L1≤2.8, S1 being a projection area of a single stator slot (3) in a preset plane, wherein the preset plane is any plane perpendicular to a thickness direction of the stator lamination, and L1 being a diameter of a circumscribed circle of the stator lamination.
2. The stator lamination of claim 1, wherein, The stator lamination further satisfies the following size requirement: 0.40≤L3 / L2≤0.45, wherein each of the stator slots (3) has a contracted slot opening (31), each of the slot openings (31) being arranged towards a center of the stator lamination, L2 being a width of the slot opening (31), and L3 being a depth of the slot opening (31).
3. The stator lamination of claim 1, wherein, The stator lamination further satisfies the following size requirement: 0.230≤S1 / (L1*Z)≤0.300, wherein Z is a number of the stator slots (3) on the stator lamination.
4. A stator lamination according to any one of claims 1 to 3, characterized in that 220 mm 2 ≤ S1≤ 280 mm 2 96 mm ≤ L1≤ 108 mm.
5. A stator core characterized by, The stator core comprises a plurality of stator laminations arranged in sequence, wherein the stator lamination is any one of the stator laminations according to claims 1 to 4.
6. A stator structure characterized by, The stator structure comprises: the stator core according to claim 5; a stator winding, the stator winding being wound on the stator core, and at least part of the stator winding being located in the stator slot (3) of each stator lamination of the stator core.
7. The stator structure of claim 6, wherein The stator winding is formed by winding a lacquered aluminum wire.
8. The stator structure of claim 7, wherein The connection mode of the stator winding is a delta connection, and the diameter of the lacquered aluminum wire is selected in a range of 0.6mm to 0.9mm.
9. The stator structure of claim 7, wherein The connection mode of the stator winding is a star connection, and the diameter of the lacquered aluminum wire is selected in a range of 0.75mm to 1.2mm.
10. A permanent magnet electric machine characterized by, The stator of the permanent magnet motor adopts the stator structure according to any one of claims 6 to 9.