Stator core, stator assembly and motor

Abstract

The embodiment of the utility model discloses a stator core, a stator assembly and a motor, and the stator core comprises a tooth part and a yoke part which are detachably connected. The tooth part comprises a ring body and a plurality of stator teeth uniformly distributed on the inner circumferential side of the ring body, the tooth part is formed by spirally winding and stacking oriented silicon steel strips, the orientation direction of the oriented silicon steel strips of the tooth part is the extension direction of the stator teeth, and the spiral stacking direction is the axial direction of the stator core; the yoke part is arranged on the outer peripheral side of the ring body in a sleeving mode, the inner peripheral side of the yoke part and the outer peripheral side of the ring body are fixedly connected through a connecting groove and a connecting protrusion which are matched, and the connecting protrusion is embedded into the connecting groove. According to the embodiment of the invention, the number of parts for manufacturing the stator core by adopting oriented silicon steel is reduced, the assembly precision is improved, and the magnetic resistance of the stator core is reduced.

Description

Technical Field

[0001] This application relates to the field of motor manufacturing technology, specifically to a stator core, stator assembly, and motor. Background Technology

[0002] With the continuous evolution of motor technology, drive motors for new energy vehicles are facing unprecedented challenges and opportunities. The industry is placing increasingly stringent requirements on them in key dimensions such as performance, efficiency, and heat dissipation.

[0003] Currently, non-oriented materials are widely used in the stator and rotor cores of main drive motors in new energy vehicles. However, this material exhibits significant limitations in application. Its maximum power output and efficiency are constrained by both saturation magnetic flux density and losses, becoming a bottleneck for further improving power density, torque density, and efficiency.

[0004] In existing technologies, using grain-oriented silicon steel is a conventional technique to improve the saturation magnetic flux density and torque of motors. To ensure that each stator tooth is oriented according to the design, the stator teeth are usually stamped from grain-oriented silicon steel into single teeth and then assembled into the stator yoke. This design is usable when the number of stator teeth is small. However, when the number of stator teeth is large, technical problems such as complex assembly process and poor assembly accuracy arise. In this case, existing technologies usually abandon the use of grain-oriented silicon steel for the teeth. Based on the above problems, reducing assembly parts and simplifying steps, as well as improving the dimensional accuracy of the assembled parts, are technical problems that urgently need to be solved to improve motor performance. Utility Model Content

[0005] This application aims to provide a stator core, stator assembly, and motor, which solves at least one of the problems in the prior art where stator cores made of grain-oriented silicon steel have many parts and poor assembly accuracy.

[0006] The objective of this application can be achieved through the following technical solutions:

[0007] In a first aspect, this application provides a stator core, the stator core including detachably connected teeth and a yoke;

[0008] The tooth section includes a ring body and multiple stator teeth evenly distributed on the inner periphery of the ring body. The tooth section is made of oriented silicon steel strips spirally wound and stacked. The orientation direction of the oriented silicon steel strips of the tooth section is the extension direction of the stator teeth, and the spiral stacking direction is the axial direction of the stator core.

[0009] The yoke is fitted onto the outer periphery of the ring, and the inner periphery of the yoke is fixedly connected to the outer periphery of the ring through a matching connecting groove and a connecting protrusion, wherein the connecting protrusion is embedded in the connecting groove.

[0010] By using spirally wound and stacked silicon-oriented steel strips to fabricate the stator teeth, the ring-shaped teeth and stator teeth form an integrated structure. Compared to traditional assembly methods involving multiple components, this integrated structure reduces the number of parts, significantly improving overall structural strength and stability. In terms of assembly, this structure facilitates integration with the yoke, effectively avoiding assembly inaccuracies caused by excessive parts and greatly improving production efficiency. From a magnetic performance perspective, using silicon-oriented steel strips allows the stator teeth to fully utilize the magnetic properties of silicon-oriented steel, reducing hysteresis losses and improving the electromagnetic performance and efficiency of the motor.

[0011] Optionally, the connecting grooves and connecting protrusions are configured to correspond one-to-one with the stator teeth.

[0012] The one-to-one connection method ensures precise alignment between the teeth and yoke, reduces assembly errors, improves the overall performance of the motor, enhances the mechanical strength of the stator core, and guarantees stability during long-term operation.

[0013] Optionally, the connecting groove is located on the inner circumference of the yoke, and the connecting protrusion is located on the outer circumference of the ring. The opening of the connecting groove faces the axis of the stator core, the groove width of the connecting groove gradually expands along the opening direction, and the connecting groove has side edges located on both radial sides of the stator core. Both side edges are inclined relative to the radial direction of the stator core.

[0014] By setting the connecting groove on the inner circumference of the yoke and the connecting protrusion on the outer circumference of the ring, and ensuring that the connecting groove and the connecting protrusion correspond one-to-one with the stator teeth and are distributed along the same radial direction, with the opening of the connecting groove facing the axis of the stator core and the two sides of the connecting groove radially inclined relative to the stator core, the magnetic circuit path is optimized. This cleverly promotes the turning process of magnetic flux between the stator teeth and the yoke, better guides the magnetic flux between the stator teeth and the yoke, reduces unnecessary magnetic losses between each stator tooth and the yoke, and thus improves the overall efficiency of the motor.

[0015] Optionally, the root width I of the connecting protrusion and the length L of any side edge are not less than the minimum width H of the stator tooth.

[0016] A sufficiently large connecting protrusion can provide a smoother conduction path for magnetic flux, avoiding congestion and blockage caused by narrow channels during conduction. This reduces magnetic resistance and the possibility of magnetic flux leakage into the surrounding space, allowing the magnetic flux to circulate more efficiently within the stator core, increasing the motor's permeability, reducing hysteresis losses, and thus improving the motor's electromagnetic performance and efficiency.

[0017] Optionally, the cross-section of the connecting groove along the radial direction of the stator core is generally triangular, trapezoidal, or semi-circular.

[0018] It offers a variety of specific connection groove structural styles, with simple structure, reduced manufacturing difficulty, and easy assembly between the teeth and yoke.

[0019] Optionally, the inner circumferential side of the yoke and the outer circumferential side of the ring are interference-fitted.

[0020] The interference fit design eliminates the need for additional fasteners, simplifying the overall structure, reducing costs, and enhancing thermal conductivity, which helps the coolant remove heat more effectively.

[0021] Optionally, the yoke is made of spirally wound and stacked silicon steel strips, with the orientation direction of the silicon steel strips in the yoke being its length direction and its spiral stacking direction being the axial direction of the stator core.

[0022] or,

[0023] The yoke is made of non-oriented silicon steel by stamping or spiral winding and stacking.

[0024] By allowing the yoke to be made of either spirally wound oriented silicon steel strips or stamped or wound non-oriented silicon steel, design flexibility is increased, allowing for flexible selection based on cost and performance requirements. The use of oriented silicon steel can further improve motor efficiency while maintaining good magnetic properties; while non-oriented silicon steel may be more suitable for low-cost or certain special applications.

[0025] Optionally, the yoke and / or ring body are provided with a number of first channels to allow coolant to pass through.

[0026] By setting up a first channel to provide a direct path for the coolant, heat dissipation efficiency is effectively improved and motor life is extended.

[0027] Optionally, the number of first channels is the same as the number of stator teeth and is set in a one-to-one correspondence.

[0028] By designing one channel for each stator tooth, uniform heat dissipation is achieved, avoiding localized overheating.

[0029] Optionally, the first channel is located between the yoke and the ring body.

[0030] Placing the channel between the yoke and the ring optimizes the coolant flow path and ensures optimal cooling. Furthermore, this location does not weaken the structural strength of the stator core and facilitates the machining and forming of the first channel.

[0031] Optionally, the outer periphery of the yoke is provided with several second channels to allow coolant to pass through.

[0032] The second channel provides an additional pathway for the coolant, aiding in heat dissipation, especially in the outer periphery of the yoke, which helps to equalize the temperature of the entire stator core. Simultaneously, when the motor housing is assembled with the outer periphery of the stator core's yoke using methods such as interference fit, the presence of the second channel can reduce deformation of the yoke caused by assembly stress.

[0033] In a second aspect, this application provides a stator assembly, which includes windings and the aforementioned stator core.

[0034] By combining the optimized stator core with the windings, a complete stator assembly is formed. The magnetic field generated by the windings can be better guided and utilized in the stator core, reducing magnetic circuit losses, improving the overall performance of the motor, and enabling the motor to convert electrical energy into mechanical energy more efficiently during operation, thus meeting the high-performance requirements of drive motors for new energy vehicles and other applications.

[0035] In a third aspect, this application provides an electric motor, which includes a rotor and the aforementioned stator assembly, wherein the rotor is rotatably mounted within the stator assembly.

[0036] Based on the superior performance of the stator assembly, the entire motor achieves higher power density, torque density, and efficiency during operation. The precise fit and interaction between the rotor and stator assemblies result in smoother motor operation, reduced vibration and noise, and meet the high performance, reliability, and comfort requirements of applications such as main drive motors for new energy vehicles. This provides stronger power support for new energy vehicles while improving their range and overall performance.

[0037] Optionally, the number of pole pairs of the rotor of the motor is P, the number of stator teeth of the tooth section is D, the number of phases of the motor is m, and the number of slots per pole per phase of the motor is q = D / 2mP, where q is a 1 / 2, 1 / 4, or 2 / 5 lumped volume or a positive integer N lumped volume.

[0038] Reasonable parameter design helps to improve the energy conversion efficiency of motors, reduce energy loss, reduce heat generation during motor operation, extend the service life of motors, and optimize the dynamic performance of motors, such as starting performance, speed regulation performance and overload capacity, to meet various complex operating requirements. Attached Figure Description

[0039] The present application will be further described below with reference to the accompanying drawings.

[0040] Figure 1 This is a schematic diagram of the stator core structure in one embodiment of this application;

[0041] Figure 2 This is a radial cross-sectional view of the stator core in one embodiment of this application;

[0042] Figure 3 yes Figure 2 A magnified view of a portion of the image;

[0043] Figure 4 This is a radial cross-sectional view of the stator core in another embodiment of this application;

[0044] Figure 5 Yes, yes Figure 4 A magnified view of a portion of the image;

[0045] Figure 6 This is a schematic diagram of the tooth structure in one embodiment of this application.

[0046] Explanation of reference numerals in the attached figures:

[0047] 1. Tooth; 11. Ring body; 12. Stator tooth; 2. Yoke; 3. Connecting groove; 4. Connecting protrusion; 5. First channel; 6. Second channel; 100. Stator core. Detailed Implementation

[0048] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0049] Please see Figure 1 , Figure 2 and Figure 4 As shown, this application provides a stator core 100, which includes a detachably connected toothed portion 1 and a yoke portion 2.

[0050] The tooth section 1 includes a ring body 11 and multiple stator teeth 12 disposed on the inner circumference of the ring body 11. The ring body 11 is circular, and the multiple stator teeth 12 are evenly distributed around the inner circumference of the ring body 11. The tooth section 1 is made of spirally wound and stacked silicon steel strips, so that the stator teeth 12 and the ring body 11 form an integral structure. Compared with the method of assembling multiple parts, this integrated structure reduces the number of parts and greatly improves the overall structural strength and stability. Moreover, this structure of the tooth section 1 facilitates assembly with the yoke section 2, effectively avoiding the problem of poor assembly accuracy caused by too many parts, and greatly improving production efficiency. At the same time, the tooth section 1, which is made of spirally wound and stacked silicon steel strips, has the orientation direction of the silicon steel strips of the tooth section 1 being the extension direction of the stator teeth 12, and the spiral stacking direction being the axial direction of the stator core 100. This allows the orientation direction of the stator teeth 12 to be better matched with the magnetic flux direction when the motor is running, giving full play to the advantages of silicon steel in this direction. For example, during the operation of the motor, the magnetic flux is mainly conducted along the stator teeth 12. This structure can ensure that the magnetic flux passes smoothly through the stator teeth 12, reduce magnetic resistance, thereby reducing hysteresis loss and improving the electromagnetic performance and efficiency of the motor.

[0051] The yoke 2 is fitted onto the outer periphery of the ring 11. The inner periphery of the yoke 2 is fixedly connected to the outer periphery of the ring 11 via a matching connecting groove 3 and a connecting protrusion 4. The connecting protrusion 4 is embedded in the connecting groove 3, thereby achieving a detachable connection between the tooth 1 and the yoke 2. This connection method allows the tooth 1 and the yoke 2 to be easily assembled and disassembled, which not only reduces the assembly difficulty of the stator core 100 and improves production efficiency, facilitating mass production, but also makes maintenance or component replacement easier and reduces maintenance costs.

[0052] Please see Figure 2-5 As shown, in some optional embodiments, the connecting groove 3 and the connecting protrusion 4 are arranged in a one-to-one correspondence with the stator teeth 12. This one-to-one correspondence design ensures the precise positioning of the teeth 1 and the yoke 2 during connection, reduces errors in the assembly process, improves the overall structural accuracy of the stator core 100, enhances the mechanical stability of the stator core 100 during operation, and ensures the long-term stable operation of the motor.

[0053] Furthermore, the connecting groove 3, connecting protrusion 4, and stator teeth 12 are distributed along the same radial direction, which cleverly promotes the magnetic flux redirection process between the stator teeth 12 and the yoke 2, making magnetic flux transmission smoother and reducing unnecessary magnetic losses between the stator teeth 12 and the yoke 2, thereby improving the electromagnetic performance and efficiency of the motor. In terms of assembly, workers can more intuitively and accurately align the teeth 1 and yoke 2, greatly reducing errors during assembly and improving the overall structural precision of the stator core 100.

[0054] Please see Figure 2As shown, further, the connecting groove 3 is provided on the inner circumferential side of the yoke 2 and extends from one end of the yoke 2 to the other end along the axial direction of the stator core 100. The connecting protrusion 4 is provided on the outer circumferential side of the ring body 11 and extends from one end of the ring body 11 to the other end along the axial direction of the stator core 100. At this time, looking outward from the axis of the stator core 100, at the position corresponding to each stator tooth 12, there is a connecting protrusion 4 on the outer circumferential side of the ring body 11 and a corresponding connecting groove 3 on the inner circumferential side of the yoke 2, all three being on the same radial straight line. The opening of the connecting groove 3 faces the axis of the stator core 100, the groove width of the connecting groove 3 gradually widens along the opening direction, and the connecting groove 3 has side edges located on both radial sides of the stator core 100, both side edges being inclined relative to the radial direction of the stator core 100. This design plays a crucial role in optimizing the magnetic circuit path, cleverly facilitating the redirection of magnetic flux between the stator teeth 12 and the yoke 2. This makes the transmission of magnetic flux between the stator teeth 12 and the yoke 2 smoother, reduces magnetic losses, and improves the electromagnetic performance and efficiency of the motor. Simultaneously, it makes it easier for the connecting protrusion 4 to be aligned and inserted into the connecting groove 3, facilitating the assembly of the teeth 1 and the yoke 2 and improving assembly efficiency.

[0055] Please see Figure 4-6 As shown, in some alternative embodiments, the difference from the previously described embodiments lies in the changed positions of the connecting groove 3 and the connecting protrusion 4. Specifically, the connecting groove 3 is located on the outer periphery of the ring 11, while the connecting protrusion 4 is located on the inner periphery of the yoke 2. When viewed radially outward from the axis of the stator core 100, it can be clearly seen that at the position corresponding to each stator tooth 12, there is a connecting groove 3 on the outer periphery of the ring 11, and correspondingly, a connecting protrusion 4 is provided on the inner periphery of the yoke 2, and the three are exactly on the same radial straight line. This arrangement ensures the accuracy of the relative position of the tooth 1 and the yoke 2 when connected.

[0056] However, it should be noted that compared to the previous embodiment where the connecting groove 3 is located on the inner circumference of the yoke 2 and the connecting protrusion 4 is located on the outer circumference of the ring 11, the magnetic loss generated when the magnetic flux is conducted between the stator teeth 12 and the yoke 2 will increase to some extent in this configuration. This is mainly because when the connecting groove 3 is located on the outer circumference of the ring 11, the magnetic circuit will be distorted to some extent due to the presence of the connecting groove 3 during the process of the magnetic flux passing through the stator teeth 12 and entering the yoke 2. This will result in more magnetic resistance during the conduction of the magnetic flux, thereby increasing the magnetic loss. This may have a certain impact on the overall performance of the motor. In practical applications, other factors (such as ease of processing, cost, etc.) need to be considered to weigh whether to adopt this structural configuration.

[0057] Please see Figure 3As shown, in some optional embodiments, the root width I and the side length L of the connecting protrusion 4 are not less than the minimum width H of the stator tooth 12. A sufficiently large connecting protrusion 4 provides a smoother conduction path for the magnetic flux, avoiding congestion and blockage caused by narrow channels during conduction. This reduces the magnetic resistance of the magnetic circuit and the possibility of magnetic flux leakage into the surrounding space. This allows the magnetic flux to circulate more efficiently within the stator core 100, improving the motor's permeability, reducing hysteresis losses, and thus enhancing the motor's electromagnetic performance and efficiency.

[0058] In some alternative embodiments, the cross-section of the connecting groove 3 along the radial direction of the stator core 100 is generally triangular (e.g., Figure 3 The cross-section can be trapezoidal or semi-circular. In specific implementations, if it is a triangular cross-section, its three sides can be straight segments or slightly curved segments; the trapezoidal cross-section has two parallel sides and two hypotenuses, and the hypotenuses can be straight segments or curved segments; the semi-circular cross-section is an arc with a certain radius, in which case the hypotenuses are arc segments located on both radial sides and symmetrical to each other. These shaped connecting grooves 3 are evenly distributed on the inner circumference of the yoke 2. After being adapted to the connecting protrusions 4 on the outer circumference of the ring body 11, they help to optimize the magnetic circuit between each stator tooth 12 and the yoke 2, reduce the magnetic loss between them, and improve the motor efficiency.

[0059] In some optional embodiments, the inner circumferential side of the yoke 2 and the outer circumferential side of the ring 11 are interference-fitted, so that the yoke 2 and the tooth 1 are in close contact, and the connecting protrusion 4 can be more firmly embedded in the connecting groove 3, further enhancing the connection tightness between the tooth 1 and the yoke 2. At the same time, the tight interference fit can effectively enhance the heat conduction performance between the tooth 1 and the yoke 2. During motor operation, heat can be transferred more quickly from the tooth 1 to the yoke 2 and then dissipated through other heat dissipation paths, which helps to improve the heat dissipation efficiency of the motor, prevent the motor performance from deteriorating or being damaged due to overheating, extend the service life of the motor, and the good heat conduction performance also helps to maintain the uniformity of the internal temperature of the motor and improve the stability of motor operation.

[0060] In some optional embodiments, the yoke 2 is made of spirally wound and stacked silicon-oriented steel strips, with the orientation direction of the silicon-oriented steel strips along their length and the spiral stacking direction along the axial direction of the stator core 100. The wound yoke 2 forms a ring structure on the outer periphery of the stator core 100, which fits tightly with the tooth 1. Using the spirally wound and stacked silicon-oriented steel strips to make the yoke 2 can fully utilize the circumferential magnetic properties of silicon-oriented steel. Combined with the silicon-oriented steel material of the tooth 1, it further optimizes the magnetic field distribution inside the motor, increases the motor's permeability, reduces hysteresis losses, and thus improves the motor's efficiency. At the same time, this structural design can improve the overall material utilization rate of the stator core 100, allowing for more complete utilization of the properties of the silicon-oriented steel.

[0061] In some alternative embodiments, the yoke 2 can be made of non-oriented silicon steel. Specifically, non-oriented silicon steel sheets can be processed into specific shapes by stamping and then spliced ​​or wound into a ring, or non-oriented silicon steel strips can be wound into a ring by winding. This ring is also fitted onto the outer periphery of the ring body 11 of the toothed part 1. This arrangement is less expensive than using oriented silicon steel to make the yoke 2. In some application scenarios where the requirements for motor performance are not particularly high or where cost control is required, this arrangement can be flexibly selected according to actual needs, increasing the design flexibility of the stator core 100 and broadening the application range of the product.

[0062] Please see Figure 1 As shown, in some optional embodiments, the yoke 2 and / or the ring 11 are provided with a plurality of first channels 5, which extend axially along the stator core 100 and allow coolant to pass through. The shape of the first channel 5 can be a circular hole, a semi-circular hole, a square hole, or other suitable shape. By providing the first channels 5, a direct path for coolant to flow inside the stator core 100 is provided, greatly improving the heat dissipation efficiency of the stator core 100 and extending the service life of the stator core 100 and the entire motor. At the same time, good heat dissipation performance helps maintain stable internal temperature of the motor, improving the reliability and stability of motor operation and ensuring that the motor maintains high performance under different operating conditions.

[0063] In some optional embodiments, the number of first channels 5 is the same as the number of stator teeth 12 and they are arranged in a one-to-one correspondence. For example, there is a corresponding first channel 5 near the position of each stator tooth 12. If the stator teeth 12 are evenly distributed on the inner circumference of the ring body 11, then the first channels 5 are also evenly distributed on the yoke 2 and / or the ring body 11. The central axis of the first channel 5 can be parallel to the central axis of the corresponding stator tooth 12 in the circumferential direction. By arranging the first channels 5 in a one-to-one correspondence with the stator teeth 12, the coolant can more accurately dissipate heat to each stator tooth 12, avoiding local overheating, ensuring the uniformity of the overall temperature distribution of the stator core 100, extending the service life of the stator core 100, and also improving the overall performance and reliability of the motor.

[0064] Please see Figure 2 and Figure 4As shown, in some optional embodiments, the first channel 5 is located between the yoke 2 and the ring 11, forming a flow channel for the coolant. For example, viewed from the radial section of the stator core 100, the first channel 5 penetrates the portion of the yoke 2 near the ring 11 and the portion of the ring 11 near the yoke 2, connecting the space between them; or, the first channel 5 only penetrates the portion of the yoke 2 near the ring 11; or the first channel 5 only penetrates the portion of the ring 11 near the yoke 2. The specific location of the first channel 5 may be between adjacent connecting protrusions 4 (see...). Figure 5 ), connecting the top of protrusion 4 (see Figure 3 (or side) are not specifically limited here.

[0065] By positioning the first channel 5 between the yoke 2 and the ring 11, the flow path of the coolant is optimized, allowing the coolant to more directly contact the areas inside the stator core 100 where heat is generated. Since the heat generated by the stator teeth 12 is conducted through the ring 11 to the connection area with the yoke 2, the coolant flowing here can quickly absorb the heat, improving heat dissipation efficiency. This positioning can more effectively reduce the core temperature of the stator core 100, protect the material properties of the stator core 100, and improve the reliability and stability of the motor.

[0066] This location, chosen without compromising the overall structural strength of the stator core 100, makes full use of the space between the yoke 2 and the ring 11. Compared to placing the channel in other locations, it reduces interference with other functional structures of the stator core 100 and facilitates processing and shaping during manufacturing, reducing processing difficulty and cost. Simultaneously, the excellent heat dissipation helps maintain stable internal motor temperature, reducing performance fluctuations caused by temperature changes and improving motor operating accuracy and efficiency.

[0067] Please see Figure 1As shown, in some optional embodiments, the outer periphery of the yoke 2 is provided with a plurality of second channels 6 to allow coolant to pass through. For example, the plurality of second channels 6 may be evenly distributed along the circumference of the yoke 2, and each second channel 6 extends axially along the yoke 2. The shape and size of the second channels 6 can be designed according to actual needs, such as circular, square or other suitable shapes, and penetrate through the thickness direction of the yoke 2, communicating with the space inside the stator core 100 (such as the first channel 5 or other coolant channels), or directly communicating with the external cooling system, forming a coolant inlet and outlet channel or an auxiliary heat dissipation channel. The second channels 6 provide additional flow channels for coolant, mainly assisting in heat dissipation in the outer periphery of the yoke 2, and contributing to the temperature uniformity of the entire stator core 100. In addition, when the motor housing is assembled with the outer periphery of the yoke 2 of the stator core 100 by means of interference fit or other methods, the presence of the second channels 6 can reduce the deformation of the yoke 2 caused by assembly stress. Because stress will concentrate on the outer periphery of the yoke 2 during the assembly process, the second channel 6 can disperse the stress, making the stress distribution more uniform, thereby protecting the structural integrity of the yoke 2 and improving the reliability and stability of the assembly between the stator core 100 and the motor housing.

[0068] This application also provides a stator assembly, which includes a winding and the aforementioned stator core 100. The winding is wound around the stator teeth 12 of the stator core 100. The winding can be made of conductive materials such as copper wire, and multiple coils are formed on the stator teeth 12 through a specific winding method (such as distributed winding or concentrated winding). These coils, together with the stator core 100, constitute a complete electromagnetic induction system. The two ends of the winding are connected to an external power source or circuit for passing current to generate a magnetic field.

[0069] The optimized stator core 100, combined with the windings, forms a complete stator assembly. The magnetic field generated by the windings can be better guided and utilized within the stator core 100 because the tooth 1 and yoke 2 structures and material properties (such as the use of grain-oriented silicon steel) of the stator core 100 optimize the magnetic circuit, reduce magnetic circuit losses, and make the magnetic field distribution more rational. As a result, during motor operation, the stator assembly can more efficiently convert electrical energy into mechanical energy, improving the overall performance of the motor and meeting the high-performance requirements of drive motors in new energy vehicles, such as increasing the motor's output power and torque, while simultaneously reducing energy loss and improving energy utilization efficiency.

[0070] This application also provides an electric motor, which consists of a rotor and a stator assembly. The rotor is located inside the stator assembly and can rotate around its axis under the influence of the magnetic field generated by the stator assembly. A certain gap is maintained between the rotor and the stator assembly; this gap is called the air gap, and the size and uniformity of the air gap have a significant impact on the performance of the motor. The rotor is mounted in the motor housing by bearings and other supporting components to ensure smooth rotation and to maintain a precise relative position with the stator assembly, allowing the magnetic field of the rotor to interact with the magnetic field generated by the stator assembly, thereby achieving energy conversion.

[0071] Based on the superior performance of the stator assembly, when the rotor and stator assembly work together to form a motor, the entire motor exhibits higher power density, torque density, and efficiency during operation. The stator assembly generates a stable and efficient magnetic field, within which the rotor rotates under the influence of electromagnetic force, converting electrical energy into mechanical energy output. Simultaneously, the precise coordination and interaction between the rotor and stator assembly result in smoother motor operation, reducing vibration and noise. This type of motor can meet the high performance, reliability, and comfort requirements of applications such as main drive motors for new energy vehicles, providing stronger power support for these vehicles while improving their range and overall performance. For example, it can output greater torque during acceleration and hill climbing, maintain high efficiency at high speeds, reduce energy loss, and the smooth operation of the motor reduces vehicle noise and vibration, improving ride comfort.

[0072] In some optional implementations, the number of pole pairs of the motor rotor is P, the number of stator teeth 12 of tooth section 1 is D, the number of phases of the motor is m, and the number of slots per pole and per phase, q, is calculated using the formula q = D / 2mP, which determines the details of the winding distribution on the stator teeth 12. When q is a 1 / 2, 1 / 4, or 2 / 5 condensed winding, the winding is concentrated in each phase slot under each pole. This distribution makes the winding relatively simple to manufacture and can meet the requirements for magnetic field distribution and torque output in some specific motor designs. For example, for a condensed winding with q = 1 / 2, only half a slot under each pole and per phase is occupied by the winding, resulting in a more compact winding distribution that can generate a larger torque, but may lead to a higher content of magnetic field harmonics, requiring corresponding optimization measures. When q is a distributed winding with a positive integer N, the winding is more evenly distributed in each phase slot under each pole. This distribution helps reduce magnetic field harmonics and improve the operating efficiency and performance stability of the motor, but the winding process is relatively complex. For example, in the distributed winding with q=3, each phase under each pole has 3 slots occupied by the winding, and the distribution of the winding on the stator teeth 12 is more dispersed, which can generate a magnetic field that is closer to a sine wave, reducing torque pulsation and energy loss.

[0073] Different q-value choices (centralized or distributed winding) can meet the needs of different application scenarios. Centralized winding is advantageous in applications with high torque requirements, cost sensitivity, and less stringent requirements for magnetic field harmonics, such as auxiliary drive motors in some small electric vehicles or specific industrial applications. Distributed winding, on the other hand, is suitable for scenarios with high motor performance requirements and strict requirements for operational stability and efficiency, such as main drive motors in new energy vehicles and high-precision industrial equipment. This flexibility allows the motor to perform optimally in different fields and operating conditions, improving its versatility and adaptability. At the same time, reasonable parameter design helps improve the motor's energy conversion efficiency, reduce energy loss, lower heat generation during operation, extend the motor's service life, and optimize the motor's dynamic performance, such as starting performance, speed regulation performance, and overload capacity, meeting various complex operating requirements.

[0074] The foregoing has provided a detailed description of one embodiment of this application, but the description is merely a preferred embodiment and should not be construed as limiting the scope of this application. All equivalent variations and modifications made within the scope of this application should still fall within the patent coverage of this application.

[0075] It should be noted that the terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Descriptions in this application regarding directions such as "left," "right," "left side," "right side," "upper part," "lower part," "top," and "bottom" are defined based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, not to indicate or imply that the described structure must be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0076] In the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

Claims

1. A stator core, characterized in that, The stator core includes detachably connected teeth and yoke; The toothed portion includes a ring body and a plurality of stator teeth evenly distributed on the inner periphery of the ring body. The toothed portion is made of oriented silicon steel strips spirally wound and stacked. The orientation direction of the oriented silicon steel strips of the toothed portion is the extension direction of the stator teeth, and the spiral stacking direction is the axial direction of the stator core. The yoke is fitted onto the outer periphery of the ring, and the inner periphery of the yoke is fixedly connected to the outer periphery of the ring through a matching connecting groove and a connecting protrusion, wherein the connecting protrusion is embedded in the connecting groove.

2. The stator core according to claim 1, characterized in that, The connecting groove, the connecting protrusion, and the stator teeth are provided in a one-to-one correspondence.

3. The stator core according to claim 2, characterized in that, The connecting groove is disposed on the inner circumferential side of the yoke, and the connecting protrusion is disposed on the outer circumferential side of the ring body. The opening of the connecting groove faces the axis of the stator core. The groove width of the connecting groove gradually expands along the opening direction. The connecting groove has side edges located on both radial sides of the stator core, and both side edges are radially inclined relative to the stator core.

4. The stator core according to claim 3, characterized in that, The root width I and the side length L of the connecting protrusion are both not less than the minimum width H of the stator tooth.

5. The stator core according to claim 3, characterized in that, The cross-section of the connecting groove along the radial direction of the stator core is generally triangular, trapezoidal, or semi-circular.

6. The stator core according to claim 1, characterized in that, The inner circumferential side of the yoke and the outer circumferential side of the ring are interference-fitted.

7. The stator core according to claim 1, characterized in that, The yoke is made of spirally wound and stacked silicon steel strips, the orientation direction of the silicon steel strips of the yoke is its length direction, and its spiral stacking direction is the axial direction of the stator core; or, The yoke is made of non-oriented silicon steel by stamping or spiral winding and stacking.

8. The stator core according to claim 1, characterized in that, The yoke and / or the ring body are provided with a plurality of first channels, the first channels extending axially along the stator core, the first channels being used to allow coolant to pass through.

9. The stator core according to claim 8, characterized in that, The number of the first channels is the same as the number of the stator teeth and they are set in a one-to-one correspondence.

10. The stator core according to claim 8, characterized in that, The first channel is located between the yoke and the ring.

11. The stator core according to any one of claims 1 to 10, characterized in that, The outer periphery of the yoke is provided with several second channels to allow coolant to pass through.

12. A stator assembly, characterized in that, The stator assembly includes windings and a stator core as described in any one of claims 1 to 11.

13. An electric motor, characterized in that, The motor includes a rotor and a stator assembly as described in claim 12, the rotor being rotatably fitted within the stator assembly.

14. The motor according to claim 13, characterized in that, The number of pole pairs of the rotor of the motor is P, the number of stator teeth of the tooth section is D, the number of phases of the motor is m, and the number of slots per pole per phase of the motor is q = D / 2mP, where q is a cumulated volume of 1 / 2, 1 / 4, or 2 / 5 or a distributed volume of a positive integer N.

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