Stator core, stator assembly and motor

Abstract

The utility model provides a stator core, a stator assembly and a motor, and particularly relates to the technical field of micro motors, and the stator core comprises a stator yoke which comprises stator end faces which are axially opposite; the stator teeth are distributed at intervals along the periphery of any stator end face, each stator tooth comprises a tooth top far away from the stator yoke and a tooth root close to the stator yoke, and the radial size of the tooth top is smaller than or equal to the radial size of the tooth root. The stator teeth are arranged on the stator end face, so that the radial size of the stator core is reduced; by optimizing the shape of the stator teeth, that is, the radial size of the tooth top is smaller than or equal to the radial size of the tooth root, the magnetic resistance is reduced, the magnetic flux density is improved, a higher magnetic induction saturation amplitude can be realized in a limited space, the high-performance requirement of a small motor is met, and meanwhile, the installation of a stator winding is facilitated; by simplifying the structural design of the stator teeth, the processing difficulty of parts can be further reduced, the assembling difficulty is reduced, and the cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of micro motor, in particular to a stator core, a stator assembly and a motor. BACKGROUND

[0002] As a key power element, micro motor is widely used in many fields such as automobile, household appliances, communication, computer, robot, aerospace industry, industrial machinery, industrial control and military. With the enhancement of global environmental protection awareness, developing high-efficiency, environmentally friendly and energy-saving motor has become the common goal of international motor industry development. At present, the mainstream micro motor on the market includes hollow cup motor, brushless DC motor and servo motor. They have high power density, meet the trend of green development, and gradually penetrate into application scenarios with high energy consumption and frequent use.

[0003] Especially in the industries of industrial robots and household appliances, the development trend is high efficiency, energy saving, miniaturization and intelligentization of equipment, which directly promotes the innovation of motor technology towards light weight, miniaturization and fast response. New type motors represented by hollow cup motor, servo motor and slotless brushless motor are constantly progressing along the technical route of high efficiency, light weight and low cost, forming an obvious trend of industrial upgrading. PCB (Printed Circuit Board) axial flux motor is a kind of micro motor with high torque density, which is especially suitable for application occasions that require providing large torque output in small space, such as flexible hand motor and joint motor in robot field, driving motor of small unmanned aerial vehicle and micro motor in high-end medical equipment. Compared with traditional brushless motor and hollow cup motor, PCB axial flux motor can improve power / torque density by 2 to 3 times, and has better product consistency, lower development cost, higher qualification rate and better process feasibility.

[0004] In the existing motor manufacturing technology, for motors with a diameter greater than 20mm, the winding stator core is a common solution. However, for small motors with a diameter less than 20mm, the existing production process faces significant technical challenges, making it difficult to ensure the quality of the winding stator core. At the same time, the silicon steel sheet or amorphous material commonly used in winding stator core has certain limitations in magnetic induction performance, with insufficient magnetic induction saturation strength, which cannot fully meet the needs of high-performance small motors. These problems seriously restrict the performance improvement and application range expansion of small motors. The present application provides a stator core, comprising: Practical new type content

[0005] In order to solve at least one of the above-mentioned problems of the prior art, the present application provides a stator core, comprising:

[0006] ​A stator yoke comprising axially opposite stator end faces;

[0007] A plurality of stator teeth are spaced along the circumference of either of the stator end faces, the stator teeth comprising tooth tips distal from the stator yoke and tooth roots proximal to the stator yoke, the tooth tips having a radial dimension less than or equal to the radial dimension of the tooth roots.

[0008] Optionally, the stator core further comprises a stator tooth crown connected to the tooth tips of the plurality of stator teeth.

[0009] Optionally, the shape of the radial cross-section of the stator tooth crown matches the distribution of the stator teeth.

[0010] Optionally, the stator tooth crown is provided with first mounting holes corresponding to the plurality of stator teeth respectively, the radial dimension of each first mounting hole matches the radial dimension of the tooth tip of the corresponding stator tooth, and the plurality of tooth tips are engaged with the corresponding first mounting holes respectively.

[0011] Optionally, the stator teeth are fixedly connected to the stator yoke.

[0012] Optionally, the stator slots are formed between adjacent stator teeth, each tooth tip extends towards the corresponding stator slot on both sides of the corresponding stator slot to form a stator tooth shoulder, and a gap is formed between the two stator tooth shoulders corresponding to the stator slot; the radial dimension of the tooth tip is equal to the radial dimension of the tooth root.

[0013] Optionally, the stator yoke is provided with second mounting holes corresponding to the plurality of stator teeth respectively, the radial dimension of each second mounting hole matches the radial dimension of the tooth root of the corresponding stator tooth, and the plurality of tooth roots are engaged with the corresponding second mounting holes respectively.

[0014] Optionally, the stator slots are formed between adjacent stator teeth, the stator slots comprise radially opposite stator slot walls, and the radially opposite stator slot walls are parallel in any radial cross-section.

[0015] In another aspect, the present application provides a stator assembly comprising the stator core as described above.

[0016] In another aspect, the present application provides a stator assembly comprising the stator assembly as described above.

[0017] By adopting the above technical solutions, the present application has the following beneficial effects:

[0018] The application provides a kind of stator core, which comprises stator yoke and stator tooth;Wherein, the stator yoke includes two axially opposite stator end faces, and the stator teeth are distributed along the circumference of any stator end face, the stator tooth includes the tooth top away from the stator yoke and the tooth root close to the stator yoke, and the radial dimension of the tooth top is less than or equal to the radial dimension of the tooth root.By arranging the stator tooth on the stator end face, the radial dimension of the stator core is effectively reduced, and the structure is compacted;By optimizing the shape of the stator tooth, the radial dimension of the tooth top is ensured to be not greater than the radial dimension of the tooth root, the magnetic resistance in the magnetic circuit is effectively reduced, and the magnetic flux density is improved, so that the motor can reach a higher magnetic induction saturation level under the same volume condition, meeting the demand of small motor for high efficiency and high performance;The optimization of the shape of the stator tooth is also conducive to the installation of the winding, and the production efficiency is improved;The simplified stator tooth structure not only reduces the machining complexity of parts, but also reduces the technical requirements of the assembly process, thereby effectively reducing the overall manufacturing cost.

[0019] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and the same reference numerals generally represent the same components. Those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0021] Figure 1 is a structural schematic diagram of a first stator core provided by the embodiments of the present application;

[0022] Figure 2 is a three-dimensional assembly view of a second stator core provided by the embodiments of the present application;

[0023] Figure 3 is a front view of the second stator core provided by the embodiments of the present application;

[0024] Figure 4 is a top view of the second stator core provided by the embodiments of the present application;

[0025] Figure 5 is a front view of a third stator core provided by the embodiments of the present application;

[0026] Figure 6 is a top view of the third stator core provided by the embodiments of the present application;

[0027] Figure 7is a third stator core provided by an embodiment of the present application;

[0028] Figure 8 is a structural schematic diagram of a motor provided by an embodiment of the present application.

[0029] The following is a supplementary description of the drawings:

[0030] 1, stator yoke; 2, stator tooth; 3, stator tooth crown; 4, first mounting hole; 5, stator slot; 6, stator tooth shoulder; 7, second mounting hole; 8, stator slot wall; 9, stator winding; 10, rotor assembly. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0032] The term "one embodiment" or "an embodiment" as referred to herein means a specific feature, structure, or characteristic under at least one implementation of the application. In the description of the application, it should be understood that the terms "upper", "lower", "top", "bottom", etc. indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms "first", "second", etc. are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can be explicitly or implicitly included one or more of the features. Moreover, the terms "first", "second", etc. are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein.

[0033] Reference Figure 1 The present application provides a stator core, which comprises:

[0034] The stator yoke 1 comprises axially opposite stator end faces; the stator end faces are the faces on the stator yoke 1 perpendicular to the axial direction of the motor, and the stator yoke 1 is usually provided in the form of a ring-shaped sheet, and correspondingly, the stator end faces also present a ring shape, which not only can provide sufficient mechanical strength to support the entire stator structure, but also helps to form a closed magnetic circuit and improve the working efficiency of the motor.

[0035] The stator teeth 2 are distributed along the circumferential edge of the stator end face, and each stator tooth 2 includes a tooth top portion away from the stator yoke 1 and a tooth root portion close to the stator yoke 1. The radial dimension of the tooth top portion is less than or equal to the radial dimension of the tooth root portion. Specifically, the stator yoke 1 further includes a surface parallel to the motor axial direction. Compared with the common design of arranging the stator teeth 2 on the surface of the stator yoke 1 parallel to the motor axial direction, arranging the stator teeth 2 on the stator end face can effectively reduce the radial dimension of the stator core and realize the miniaturization of the motor, thereby providing higher performance in a limited space. In a specific implementation, the plurality of stator teeth 2 are uniformly distributed along the circumferential edge of the stator end face, thereby ensuring the uniformity and stability of the magnetic field. In order to further optimize the performance of the motor, the radial dimension of the tooth top portion is equal to the radial dimension of the tooth root portion, that is, the radial dimension of the stator tooth 2 remains unchanged from the tooth root portion to the tooth top portion. This not only simplifies the manufacturing process of the stator tooth 2 and reduces the production cost, but also greatly facilitates the installation of the stator winding 9. Specifically, the stator winding 9 can be easily sleeved on the stator tooth 2 from the tooth top portion, thereby reducing the complexity and potential error in the installation process and improving the convenience and production efficiency of the installation.

[0036] Specifically, in the embodiment of the present application, by arranging the stator teeth 2 on the stator end face, the radial dimension of the stator core can be effectively reduced, and the miniaturization of the motor can be realized. At the same time, by optimizing the shape of the stator teeth 2, that is, the radial dimension of the tooth top portion is less than or equal to the radial dimension of the tooth root portion, the magnetic resistance can be reduced and the magnetic flux density can be improved, thereby realizing a higher magnetic induction saturation amplitude in a limited space and meeting the high performance requirements of the small motor. In addition, simplifying the structural design of the stator teeth 2 can further reduce the machining difficulty of the parts, reduce the assembly difficulty, reduce the cost, and improve the overall economic benefit.

[0037] In one possible implementation, with reference to Figures 2 to 4The stator core further comprises a stator tooth crown 3 connected to the tooth tops of the plurality of stator teeth 2. Specifically, cogging torque is generated due to the interaction between the stator teeth 2 and the rotor slots, which can cause vibration and noise during motor operation. By introducing the stator tooth crown 3, the tooth tops of the plurality of stator teeth 2 are connected to form a continuous surface, reducing the cogging effect; this continuous surface helps to smooth the air gap magnetic field distribution, thereby effectively reducing the cogging torque, reducing the vibration and noise of the motor, and improving the smoothness of the motor operation. Specifically, torque ripple is the phenomenon of torque fluctuation during motor operation, which can affect the stability and efficiency of the motor. The stator tooth crown 3 connects the tooth tops of the plurality of stator teeth 2, which can improve the uniformity of the air gap magnetic field and reduce the irregular changes of the magnetic field. This uniform magnetic field distribution helps to reduce torque ripple, improve the stability and efficiency of the motor operation, and prolong the service life of the motor. Specifically, traditional stator tooth design usually requires complex processing technology, especially in the processing of the tooth top. After introducing the stator tooth crown 3, the tooth tops of the plurality of stator teeth 2 can be connected into a whole, simplifying the processing steps of individual stator teeth, reducing the dependence on high-precision processing equipment, and reducing material and labor costs. At the same time, the modular assembly method improves production efficiency, shortens production cycle, and further reduces overall manufacturing cost.

[0038] Specifically, in the embodiments of the present application, by introducing the stator tooth crown 3, not only the performance of the motor is optimized in terms of technology, the cogging torque and torque ripple are reduced, and the stability and efficiency of operation are improved, but also the process is simplified and the cost is reduced in the manufacturing and assembly process, providing strong support for the high performance and economy of small motors.

[0039] In one possible implementation, the shape of the radial section of the stator tooth crown 3 matches the distribution of the stator teeth 2. In specific implementations, when the stator yoke 1 is in the form of a ring-shaped sheet, the distribution of the stator teeth 2 is also in the form of a ring, and accordingly, the radial section of the stator tooth crown 3 is also in the form of a ring.

[0040] Specifically, in the embodiments of the present application, the shape of the radial section of the stator tooth crown 3 matches the distribution of the stator teeth 2, which helps to form a more uniform air gap magnetic field. This uniform magnetic field distribution can reduce the magnetic resistance and improve the magnetic flux density, thereby achieving a higher magnetic induction saturation value in a limited space. Uniform magnetic field distribution also helps to reduce cogging torque and torque ripple, reduce vibration and noise during motor operation, and improve the smoothness and efficiency of motor operation.

[0041] In a possible implementation, the stator crown 3 is provided with first mounting holes 4 corresponding to the plurality of stator teeth 2 respectively, the radial dimension of each first mounting hole 4 matches the radial dimension of the tooth top of the corresponding stator tooth 2, and the plurality of tooth tops are respectively clamped with the corresponding first mounting holes 4, so that the tooth top of the stator tooth 2 can be tightly clamped in the first mounting hole 4, forming a stable connection between the stator crown 3 and the stator tooth 2, which not only enhances the overall rigidity of the stator core, but also improves the stability of the stator core during high-speed operation, reduces vibration and noise. During installation, the stator winding 9 can be sleeved on the stator tooth 2 from the tooth top, and then the plurality of first mounting holes 4 of the stator crown 3 are respectively clamped with the corresponding tooth top. This modular installation method not only ensures the tight connection between the stator tooth 2 and the stator crown 3, but also simplifies the assembly steps, improves the production efficiency, shortens the production cycle, and further reduces the overall manufacturing cost.

[0042] Specifically, in the embodiments of the present application, the plurality of first mounting holes 4 of the stator crown 3 are respectively clamped with the corresponding tooth top, which not only realizes precise matching and modular assembly in structure, but also simplifies the processing and assembly process and reduces the production cost.

[0043] In a possible implementation, the stator tooth 2 is fixedly connected with the stator yoke 1 to form an integrated structure. In specific implementation, the fixed connection can be achieved in various ways, such as welding, riveting or one-piece forming, etc.

[0044] Specifically, in the embodiments of the present application, the stator tooth 2 and the stator yoke 1 are an integrated structure, which ensures that there is no relative displacement between the stator tooth 2 and the stator yoke 1, thereby improving the structural rigidity and stability of the entire stator core.

[0045] In a possible implementation, referring to Figures 5 to 7, the top of each tooth extends towards the corresponding stator slot 5 on both sides near the two sides of the corresponding stator slot 5, forming a stator tooth shoulder 6, and a gap is formed between the corresponding two stator tooth shoulders 6 of each stator slot 5; the radial dimension of the tooth top is equal to the radial dimension of the tooth root, facilitating the stator winding 9 to be sleeved on the stator tooth 2 from the tooth root of the stator tooth 2. Specifically, the stator slot 5 is used to accommodate the stator winding 9, ensuring that an effective magnetic field can be generated when current passes through. The stator tooth shoulder 6 is used to form a transition area between the stator tooth 2 and the stator slot 5, ensuring uniform distribution of the magnetic field, and a gap is formed between the corresponding two stator tooth shoulders 6 of each stator slot 5, which helps to reduce the magnetic resistance and improve the magnetic flux density. Specifically, the stator tooth shoulder 6 forms a smooth transition area between the stator tooth 2 and the stator slot 5, which helps to reduce irregular changes in the magnetic field and improve the uniformity of the magnetic field. Uniform magnetic field distribution helps to reduce torque ripple and improve the torque performance of the motor, ensuring stable torque output under different load conditions. The smooth transition area formed by the stator tooth shoulder 6 reduces the cogging effect, which is caused by the interaction between the stator tooth and the rotor slot, and can cause vibration and noise during motor operation. By reducing the cogging effect, the cogging torque can be effectively reduced, and the running stability of the motor can be improved. The stator tooth shoulder 6 improves the distribution of the air gap magnetic field, making the magnetic field more uniform and reducing the concentration and dispersion of magnetic lines, thereby reducing the cogging torque.

[0046] Specifically, in the embodiments of the present application, the stator tooth shoulder 6 is arranged to optimize the structure of the stator tooth 2, ensuring torque performance, cogging torque performance and torque ripple performance in terms of performance, and providing strong support for high performance of small motors.

[0047] In one possible implementation, the stator yoke 1 is provided with second mounting holes 7 corresponding to the plurality of stator teeth 2, respectively, and the radial dimension of each second mounting hole 7 matches the radial dimension of the tooth root of the corresponding stator tooth 2, and the plurality of tooth roots are respectively clamped with the corresponding second mounting holes 7 to form a stable connection. Specifically, the stator yoke 1 and the stator tooth 2 are of a split structure, the radial dimension of the tooth top of the stator tooth 2 is equal to the radial dimension of the tooth root, and the stator core is assembled by splicing the two. This split structure design allows the stator tooth 2 and the stator yoke 1 to be manufactured separately and then assembled, thereby simplifying the manufacturing process and improving production efficiency. During installation, the stator winding 9 can be sleeved on the stator tooth 2 from the tooth root of the stator tooth 2, and after the stator winding 9 is installed, the tooth root of the stator tooth 2 is aligned with and clamped with the second mounting hole 7 on the stator yoke 1. This modular assembly method not only simplifies the assembly steps, but also ensures the close connection between the stator tooth 2 and the stator yoke 1.

[0048] Specifically, in the embodiments of the present application, the stator yoke 1 and the stator tooth 2 are arranged in a split structure, and the stator core is assembled by splicing the stator yoke 1 and the stator tooth 2, which realizes precise matching and modular assembly in structure, simplifies the processing and assembly process, reduces the production cost, and provides strong support for the economy of small motors.

[0049] In one possible implementation, the stator slots 5 are formed between the adjacent stator teeth 2, and each stator slot 5 includes radially opposite stator slot walls 8 that are parallel in any radial cross section. Specifically, the distance between the radially opposite stator slot walls 8 can be different or the same in different radial cross sections. Specifically, the distance between the radially opposite stator slot walls 8 is the same in different radial cross sections, in which case the radially opposite stator slot walls 8 are parallel to each other to form parallel slots; this helps to reduce irregular changes in the magnetic field, improve the uniformity of the magnetic field, reduce eddy current loss, improve the efficiency of the motor, and facilitate the installation of the stator winding 9. Specifically, the distance between the radially opposite stator slot walls 8 is different in different radial cross sections, in which case the radially opposite stator slot walls 8 form parallel slots with slopes; the shape of the slots can be adjusted according to the specific needs of the motor, thereby optimizing the magnetic field distribution. The slots with slopes can reduce the magnetic resistance in a specific area, improve the local magnetic flux density, reduce the cogging effect, i.e., the interaction between the stator teeth and the rotor slots, which helps to reduce the cogging torque, reduce the vibration and noise of the motor, and improve the smoothness of the motor operation. In different application scenarios, the slope of the slots can be adjusted to optimize the performance of the motor.

[0050] Specifically, in the embodiments of the present application, by arranging parallel slots, the structure is highly optimized, and the torque performance, cogging torque performance, and torque ripple performance are guaranteed, thereby simplifying the processing and assembly process.

[0051] On the other hand, a stator assembly is also provided, which includes the stator core in any of the above embodiments.

[0052] On the other hand, a motor is also provided, which includes the stator assembly in the above embodiments. For example, referring to Figure 8 The S-R-S axial flux motor generally includes two stator assemblies and a rotor assembly 10 located between the two stator assemblies. Each stator assembly is composed of a stator core and a stator winding 9. The stator core in the above embodiments can also be applied to other types of motors, such as S-R-S-R-S axial flux motor, radial flux motor, hybrid flux motor, etc.

[0053] To sum up, the stator core of the application, the stator core comprises a stator yoke and a stator tooth; wherein the stator yoke comprises two axially opposite stator end faces, the stator tooth is distributed along the circumference of any stator end face, the stator tooth comprises a tooth top part away from the stator yoke and a tooth root part close to the stator yoke, and the radial dimension of the tooth top part is less than or equal to the radial dimension of the tooth root part. By arranging the stator tooth at the stator end face, the radial dimension of the stator core is effectively reduced, and the structure is compact; by optimizing the shape of the stator tooth, the radial dimension of the tooth top part is ensured to be not greater than the radial dimension of the tooth root part, the magnetic resistance in the magnetic circuit is effectively reduced, the magnetic flux density is improved, so that the motor can reach a higher magnetic induction saturation level under the same volume condition, and the demand for high efficiency and high performance of small motors is met; the optimization of the shape of the stator tooth is also conducive to the installation of the winding, and the production efficiency is improved; the simplified stator tooth structure not only reduces the machining complexity of the parts, but also reduces the technical requirements of the assembly process, thereby effectively reducing the overall manufacturing cost.

[0054] In the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the connection or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0055] It should be noted that: the above sequence of the embodiments of the application is only for description, not representing the advantages and disadvantages of the embodiments, and the above description of the present application is described for specific embodiments, and other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be executed in different order in different embodiments and can achieve the expected results. In addition, the processes depicted in the drawings do not necessarily require a specific order or connection order to achieve the desired results, and in some embodiments, multiple tasks can be processed in parallel or it can be advantageous.

[0056] Each embodiment in the present specification is described in a progressive manner, and the same or similar parts between each embodiment can be referred to each other, and each embodiment focuses on the differences from other embodiments.

[0057] The above is only the preferred embodiment of the present application, and does not limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A stator core characterized by, The stator core comprises: a stator yoke (1) comprising axially opposite stator end faces; a plurality of stator teeth (2) distributed along the periphery of either of the stator end faces, each of the stator teeth (2) comprising a tooth top portion distal to the stator yoke (1) and a tooth root portion proximal to the stator yoke (1), the tooth top portion having a radial dimension less than or equal to the radial dimension of the tooth root portion.

2. The stator core according to claim 1, characterized by The stator core further comprises a stator tooth crown (3) connected to the tooth top portions of the plurality of stator teeth (2).

3. The stator core of claim 2, characterized by The stator tooth crown (3) has a radial cross-sectional shape matching the distribution of the stator teeth (2).

4. The stator core according to claim 3, characterized by The stator tooth crown (3) is provided with a plurality of first mounting holes (4) corresponding to the plurality of stator teeth (2) respectively, each of the first mounting holes (4) having a radial dimension matching the radial dimension of the tooth top portion of the corresponding stator tooth (2), and the plurality of tooth top portions are respectively engaged with the corresponding first mounting holes (4).

5. The stator core according to any one of claims 1 to 4, characterized by The stator teeth (2) are fixedly connected to the stator yoke (1).

6. The stator core of claim 1, characterized by Adjacent stator teeth (2) form stator slots (5), each of the tooth top portions extends towards the corresponding stator slot (5) on both sides of the corresponding stator slot (5) to form stator tooth shoulders (6), and a gap is formed between the two stator tooth shoulders (6) corresponding to each stator slot (5); the radial dimension of the tooth top portion is equal to the radial dimension of the tooth root portion.

7. The stator core of claim 6, characterized by The stator yoke (1) is provided with a plurality of second mounting holes (7) corresponding to the plurality of stator teeth (2) respectively, each of the second mounting holes (7) has a radial dimension matching the radial dimension of the tooth root portion of the corresponding stator tooth (2), and the plurality of tooth root portions are respectively engaged with the corresponding second mounting holes (7).

8. The stator core of claim 1, characterized by Adjacent stator teeth (2) form stator slots (5), the stator slots (5) comprise radially opposite stator slot walls (8) which are parallel in any radial cross-section.

9. A stator assembly characterized by, The stator core comprises:

10. An electric machine characterized by The stator assembly comprises: The stator assembly comprises:

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