Stator core, stator assembly and electric motor

Abstract

The present invention relates to a stator core, a stator assembly and an electric motor, the stator core comprising a tooth part and a yoke part in a releasably connected manner. The tooth part comprises a ring body and a plurality of stator teeth arranged uniformly on the inner circumferential side of the ring body, wherein the tooth part is produced by helically winding and stacking oriented silicon steel strips, the orientation direction of the oriented silicon steel strips of the tooth part being the extension direction of the stator teeth, and the helical stacking direction being the axial direction of the stator core. The yoke part is provided around the outer circumferential side of the ring body, the inner circumferential side of the yoke part being connected to the outer circumferential side of the ring body by suitable connecting slots and connecting projections, wherein the connecting projections engage in the connecting slots. By means of the exemplary embodiments of the present invention, the number of individual parts for producing the stator core is reduced by using oriented silicon steel, assembly precision is increased and the magnetic resistance of the stator core is reduced.

Description

[0001] February 26, 2026

[0002] 1

[0003] Stator core, stator assembly and electric motor

[0004] The present application relates to the technical field of electric motor manufacturing, in particular a stator core, a stator assembly and an electric motor.

[0005] With the continuous advancement of electric motor technology, drive motors for vehicles powered by new energy sources face unprecedented challenges and opportunities. The industry is placing ever higher demands on key parameters such as functional characteristics, efficiency, heat dissipation, etc.

[0006] Currently, non-oriented materials are frequently used for the stator cores of main drive electric motors in new energy vehicles. However, these materials have significant application limitations. Their maximum power output and efficiency are limited in two ways: by saturation magnetization and by losses, which represents a bottleneck for further increases in power density, torque density, and efficiency.

[0007] In state-of-the-art technology, the use of oriented silicon steel is a common technical procedure for increasing the saturation magnetization and torque of electric motors. To ensure that each stator tooth segment corresponds to the specified orientation, the stator tooth segments are typically stamped from oriented silicon steel to obtain individual teeth, which are then mounted onto the stator yoke. This procedure is practical for a small number of stator teeth. However, with a large number of stator teeth, technical challenges arise.

[0008] 2

[0009] Problems such as complicated assembly processes and insufficient precision after assembly arise. Therefore, current technology typically avoids the use of oriented silicon steel for manufacturing the gear components. Given these problems, the reduction of individual assembly parts, the simplification of assembly steps, and the increase in the dimensional precision of the individual parts after assembly are urgently needed to improve the functional characteristics of electric motors.

[0010] The objective of the present application is to provide a stator core, a stator assembly and an electric motor in order to solve at least one of the problems of the prior art, namely that when using oriented silicon steel to manufacture the stator core, numerous individual parts are required and, after assembly, there is a lack of precision.

[0011] The objective of this application can be achieved through the following technical solutions:

[0012] According to a first aspect, the present application provides a stator core, wherein the stator core detachably comprises a tooth part and a yoke part,

[0013] wherein the tooth part comprises a ring body and several stator teeth evenly arranged on the inner circumferential side of the ring body, wherein the tooth part is manufactured by helical winding and stacking of oriented silicon steel strips, wherein the orientation direction of the oriented silicon steel strips of the tooth part is the extension direction of the stator teeth and the helical stacking direction is the axial direction of the stator core, 26.02.2026

[0014] 3

[0015] wherein the yoke part is provided around the outer circumferential side of the ring body, wherein the inner circumferential side of the yoke part is fastened to the outer circumferential side of the ring body by means of suitable connecting grooves and connecting projections, wherein the connecting projections engage in the connecting grooves.

[0016] By manufacturing the tooth section through spiral winding and stacking of oriented silicon steel strips, the ring body of the tooth section and the stator teeth can be constructed as a single piece. Compared to the conventional assembly method using numerous individual parts, this single-piece design reduces the number of components and significantly increases the overall strength and stability of the assembly. From an assembly perspective, this design simplifies mounting to the yoke and effectively avoids the problem of insufficient assembly precision caused by an excessive number of parts, thus greatly increasing productivity.From the perspective of magnetic properties, the toothed part manufactured using oriented silicon steel strips can fully exploit the advantages of the magnetic properties of oriented silicon steel, reducing losses due to magnetic hysteresis and increasing the electromagnetic properties and efficiency of the electric motor.

[0017] Optionally, the connecting grooves, connecting projections and stator teeth are each provided to correspond one-to-one with each other.

[0018] The one-to-one correspondence ensures a precisely fitting connection between the toothed part and the yoke part, which reduces assembly defects and improves the overall functional properties of the electric motor, as well as its mechanical strength. 26.02.2026

[0019] 4

[0020] the stator core is increased and stability is ensured during long-term operation.

[0021] Optionally, the connecting groove is provided on the inner circumferential side of the yoke part, wherein the connecting projection is provided on the outer circumferential side of the ring body, wherein the opening of the connecting groove points towards the central axis of the stator core, wherein the groove width of the connecting groove gradually widens in the direction of said opening, wherein the connecting groove has side edges located on the two radial sides of the stator core, wherein the side edges located on both sides are each inclined in the radial direction with respect to the stator core.

[0022] By arranging the connecting groove on the inner circumferential side of the yoke, the connecting projection on the outer circumferential side of the ring body, and the connecting grooves, connecting projections, and stator teeth in a one-to-one correspondence in the same radial direction, with the opening of the connecting groove pointing towards the central axis of the stator core and both sides of the connecting groove inclined radially relative to the stator core, the magnetic flux flow is optimized, and the process of guiding the magnetic flux between the stator teeth and the yoke is refined, resulting in better magnetic flux guidance between the stator teeth and the yoke. This reduces unnecessary magnetic losses between the individual stator teeth and the yoke, thus increasing the overall efficiency of the electric motor.

[0023] Optionally, the base width I of the connecting projection and the length L of any side edge are each not less than the minimum width H of the stator tooth. P 100M25004WQ

[0024] February 26, 2026

[0025] 5

[0026] Sufficiently large dimensions of the connecting projection allow for improved, unimpeded magnetic flux, thus preventing congestion and blockages caused by constrictions during magnetic flux transmission. This reduces magnetic resistance and the risk of magnetic leakage into the environment. The magnetic flux can therefore circulate more efficiently within the stator core, increasing the magnetic conductivity of the electric motor, reducing losses due to magnetic hysteresis, and ultimately improving the electromagnetic properties and thus the efficiency of the electric motor.

[0027] Optionally, the cross-section of the connecting groove in the radial direction of the stator core generally has a triangular, trapezoidal or semicircular shape.

[0028] By providing several specific design methods for the connecting groove, the design is simplified, reducing the difficulty of manufacturing and facilitating assembly between the tooth part and the yoke part.

[0029] Optionally, there is an interference fit between the inner circumferential side of the yoke part and the outer circumferential side of the ring body.

[0030] This press-fit design eliminates the need for additional fasteners, simplifying the overall construction, reducing costs, and improving thermal conductivity, which in turn leads to more effective heat dissipation by the coolant. 26.02.2026

[0031] 6

[0032] Optionally, the yoke part is manufactured by spiral winding and stacking of oriented silicon steel strips, wherein the orientation direction of the oriented silicon steel strips of the yoke part is its longitudinal direction and the spiral stacking direction is the axial direction of the stator core, or the yoke part is manufactured from non-oriented silicon steel by stamping or spiral winding and stacking.

[0033] The fact that the yoke can be manufactured by spiral winding and stacking of oriented silicon steel strips, just as the yoke can be made of non-oriented silicon steel by stamping or spiral winding and stacking, increases the design flexibility, allowing for different options depending on cost and functional requirements. Furthermore, using oriented silicon steel while maintaining good magnetic properties can increase the efficiency of the electric motor, while using non-oriented silicon steel offers better suitability for cost savings and specific applications.

[0034] Optionally, several first passage channels are provided on the yoke part and / or the ring body, wherein the first passage channels extend in the axial direction of the stator core, the first passage channels serving to enable the flow of coolant.

[0035] By providing the first flow channels, a direct flow path for the coolant is made available, which significantly increases heat dissipation efficiency and extends the service life of the electric motor. Optionally, the number of first flow channels is identical to the number of stator teeth, and these are provided one-to-one. 26.02.2026

[0036] 7

[0037] The design, in which each stator tooth corresponds to a first through-channel, ensures uniform heat dissipation, thus avoiding the phenomenon of localized overheating.

[0038] Optionally, the first passage channels are located between the yoke part and the ring body.

[0039] By providing these through-channels between the yoke and the ring body, the flow path of the coolant is optimized, ensuring an optimal cooling effect. Selecting this position does not weaken the strength of the stator core structure, while simultaneously simplifying the machining process for the initial through-channels.

[0040] Optionally, several second passage channels are provided on the outer circumferential side of the yoke part, which serve to enable the flow of coolant.

[0041] The provision of the second through-channel provides an additional passage for the coolant, which aids heat dissipation and, in particular, has a positive effect on the uniform heat distribution of the entire stator core in the area surrounding the yoke. If, at the same time, the outer casing of the electric motor is connected to the outer circumferential side of the yoke of the stator core by a press fit, etc., the presence of the second through-channel can reduce deformations of the yoke caused by assembly-related stresses. Secondly, the present application provides a stator assembly comprising a winding and a stator core. 26.02.2026

[0042] 8

[0043] By combining the optimized stator core with the winding, a complete stator assembly is formed. The magnetic field generated by the winding can be better guided and utilized within the stator core, thereby reducing magnetic losses and improving the overall performance of the electric motor. This allows the electric motor to convert electrical energy into mechanical energy more efficiently during operation, thus meeting the high performance requirements of an electric motor for vehicles powered by new energy sources.

[0044] According to a third aspect, the present invention provides an electric motor, wherein the electric motor comprises a rotor and the aforementioned stator assembly, wherein the rotor is rotatably provided within the stator assembly.

[0045] Due to the outstanding properties of the stator assembly, the entire electric motor achieves higher power density, torque density, and efficiency during operation. The precise fit and optimal interaction of the rotor and stator assembly ensure trouble-free operation of the electric motor, reduce vibrations and noise, and meet the high demands for functional characteristics, reliability, and comfort, for example, when used as the main drive motor for renewable energy vehicles. This results in enhanced drive support for renewable energy vehicles, while simultaneously improving their overall range and performance.

[0046] Optionally, the number of pole pairs of the rotor of the electric motor P, the number of stator teeth of the stator tooth part D, the number of phases of the electric motor mP 100M25004WQ

[0047] February 26, 2026

[0048] 9

[0049] and the number of slots per pole and phase q = D / 2mPt, where q is a concentrated winding of 1 / 2, 1 / 4 or 2 / 5 or a distributed winding with a positive integer N.

[0050] Sensible parameter design helps to improve the energy conversion efficiency of the electric motor, reduce energy losses, decrease heat generation during operation of the electric motor, extend the service life of the electric motor and optimize the dynamic functional characteristics of the electric motor, such as start-up behavior, speed control and overload capacity, in order to meet various complex operating requirements.

[0051] The following is a further description of the present application with reference to the attached figures.

[0052] Figure 1 shows a schematic view of the construction of the stator core according to an exemplary embodiment of the present application.

[0053] Figure 2 shows a radial sectional view of the stator core according to an exemplary embodiment of the present application.

[0054] Figure 3 shows a partially enlarged view from Figure 2.

[0055] Figure 4 shows a radial sectional view of the stator core according to a further exemplary embodiment of the present application.

[0056] Figure 5 shows a partially enlarged view from Figure 4.

[0057] Figure 6 shows a schematic view of the construction of the tooth part according to an exemplary embodiment of the present application.

[0058] Reference symbols in the figures: 1. Tooth part, 11. Ring body, 12. Stator tooth, 2. Yoke part,

[0059] 3. Connecting groove, 4. Connecting projection, 5. First passage channel, 6. Second passage channel, 100. Stator core P 100M25004WG

[0060] February 26, 2026

[0061] 10

[0062] Specific exemplary implementation forms

[0063] The following provides a clear and complete description of the technical solutions from exemplary embodiments of the present application, with reference to the accompanying figures. It is understood that the described exemplary embodiments represent only a portion of the exemplary embodiments of the present application and not all of them. Based on the exemplary embodiments from the present application, a person skilled in the relevant technical field can, without creative effort, arrive at further exemplary embodiments, all of which fall within the scope of protection of the present application.

[0064] As shown in Figure 1, Figure 2 and Figure 4, the present application provides a stator core 100, wherein the stator core 100 detachably comprises a tooth part 1 and a yoke part 2.

[0065] The tooth section 1 comprises a ring body 11 and several stator teeth 12 arranged on the inner circumferential side of the ring body 11. The ring body 11 has a circular ring shape, and several stator teeth 12 are evenly spaced around the inner circumferential side of the ring body 11. The tooth section 1 is manufactured by helical winding and stacking of oriented silicon steel strips, so that the stator teeth 12 and the ring body 11 form a single-piece assembly. This single-piece construction results in a reduction in the number of individual parts compared to an assembly from numerous individual parts, and a significant improvement in the strength and stability of the overall assembly is achieved.Such a design facilitates the assembly of tooth part 1 and yoke part 2, effectively avoiding the problem of insufficient assembly precision caused by an excessive number of individual parts, thus greatly increasing productivity. P 100M25004WG.

[0066] February 26, 2026

[0067] 11

[0068] Simultaneously with the production of the tooth section 1 by spiral winding and stacking of oriented silicon steel strips, it is provided that the orientation direction of the oriented silicon steel strips of the tooth section 1 corresponds to the extension direction of the stator teeth 12 and the spiral stacking direction corresponds to the axial direction of the stator core 100. This facilitates the alignment between the orientation direction of the stator teeth 12 and the direction of the magnetic flux during operation of the electric motor, so that the advantages of the oriented silicon steel can be fully exploited in the relevant direction.For example, if during the operation of the electric motor the magnetic flux is mainly guided along the stator teeth 12, the aforementioned design can ensure the unimpeded magnetic flux in the stator teeth 12, which reduces magnetic resistance, reduces losses due to magnetic hysteresis and increases the electromagnetic properties and efficiency of the electric motor.

[0069] The yoke part 2 is provided around the outer circumferential side of the ring body 11, the inner circumferential side of the yoke part 2 being connected to the outer circumferential side of the ring body 11 by means of matching connecting grooves 3 and connecting projections 4, the connecting projections 4 engaging in the connecting grooves 3, thus creating a detachable connection between the tooth part 1 and the yoke part 2. This connection method allows for easy assembly and disassembly of the tooth part 1 and the yoke part 2, which not only reduces the difficulty of assembling the stator core 100, increases productivity and has a positive impact on mass production, but also simplifies necessary repairs or the replacement of parts and reduces the corresponding maintenance and repair costs.

[0070] As shown in Figures 2-5, in preferred exemplary embodiments of the present application the connecting grooves 3, the connecting projections 4 and the stator teeth 12 are each one-to-one corresponding to each other. P 100M25004WG

[0071] February 26, 2026

[0072] 12

[0073] The design with a one-to-one corresponding connection ensures that there is an exact fit between the tooth part 1 and the yoke part 2 when they are joined, which reduces defects during assembly and increases the precision of the overall construction of the stator core 100, as well as increasing the mechanical stability of the stator core 100 during operation, which also ensures the stability of the electric motor in long-term operation.

[0074] Furthermore, the connecting grooves 3, the connecting projections 4, and the stator teeth 12 are arranged in the same radial direction. This facilitates the process of guiding the magnetic flux between the stator teeth 12 and the yoke 2 in a refined manner, allowing the magnetic flux to flow more freely. This reduces unnecessary magnetic losses between the individual stator teeth 12 and the yoke 2, thereby increasing the electromagnetic properties and efficiency of the electric motor. During assembly, the personnel have immediate visual control, enabling precise alignment between the tooth 1 and the yoke 2. This significantly reduces errors occurring during assembly and increases the overall precision of the stator core 100 design.

[0075] As shown in Figure 2, the connecting groove 3 is provided on the inner circumferential side of the yoke part 2 and extends axially along the stator core 100 from one end of the yoke part 2 to its other end. The connecting projection 4 is provided on the outer circumferential side of the ring body 11 and extends axially along the stator core 100 from one end of the ring body 11 to its other end. Viewed from the axis of the stator core 100 outwards, a connecting projection 4 is now located at each position corresponding to a stator tooth 12.

[0076] February 26, 2026

[0077] 13

[0078] A projection 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 part 2, wherein the three elements are located on the same straight line in the radial direction. The opening of the connecting groove 3 points towards the central axis of the stator core 100, wherein the groove width of the connecting groove 3 gradually widens in the direction of said opening, wherein the connecting groove 3 has side edges located on both radial sides of the stator core 100, the side edges located on both sides being inclined in the radial direction with respect to the stator core 100.This design is crucial for optimizing the magnetic flux flow and ingeniously facilitates the process of guiding the magnetic flux between the stator teeth 12 and the yoke part 2, thereby allowing the magnetic flux between the stator teeth 12 and the yoke part 2 to flow more freely. This reduces magnetic losses and thus improves the electromagnetic properties and efficiency of the electric motor. Furthermore, it simplifies the alignment and insertion of the connecting projection 4 into the connecting groove 3, simplifying the assembly of the tooth part 1 and the yoke part 2 and increasing assembly efficiency.

[0079] As shown in Figures 4-6, some optional exemplary embodiments differ from the exemplary embodiments described above by the modified positions of the connecting groove 3 and the connecting projection 4. Viewed radially outward from the center of the stator core 100, it is clearly evident that at each position corresponding to a stator tooth 12, there is a connecting groove 3 on the outer circumferential side of the ring body 11 and, correspondingly, a connecting projection 4 on the inner circumferential side of the yoke part 2, with the three elements located precisely on the same straight line in the radial direction. This arrangement ensures the precise relative position of the tooth part 1 to the yoke part 2 in the connected state.

[0080] February 26, 2026

[0081] 14

[0082] It should be noted, however, that compared to previous exemplary embodiments, in which the connecting groove 3 is located on the inner circumferential side of the yoke part 2 and the connecting projection 4 is located on the outer circumferential side of the ring body 11, the magnetic loss during the conduction of the magnetic flux between the stator tooth 12 and the yoke part 2 may be somewhat increased. This is mainly because, when the connecting groove 3 is located on the outer circumferential side of the ring body 11, the magnetic flux undergoes some distortion as it passes through the stator teeth 12 into the yoke part 2 due to the presence of the connecting groove 3, which leads to an increased magnetic resistance along the magnetic flux path. This increases the magnetic losses, which can ultimately impair the functional characteristics of the electric motor.In actual application practice, a comprehensive assessment of other factors (such as processing effort, costs, etc.) must be carried out to decide whether the aforementioned design should be applied or not.

[0083] As shown in Figure 3, in some optional exemplary embodiments, the base width I of the connecting projection 4 and the length L of any side edge are each no less than the minimum width H of the stator tooth 12. Sufficiently large dimensions of the connecting projection 4 allow for improved, unimpeded flow of the magnetic flux, thus preventing congestion and blockages caused by constrictions during magnetic flux transmission. This reduces magnetic resistance and the risk of magnetic leakage into the environment. The magnetic flux can therefore circulate more efficiently in the stator core 100, increasing the magnetic conductivity of the electric motor, reducing losses due to magnetic hysteresis, and thus improving the electromagnetic properties and efficiency of the electric motor.

[0084] February 26, 2026

[0085] 15

[0086] In some optional exemplary embodiments, the cross-section of the connecting groove 3 in the radial direction of the stator core 100 generally has a triangular shape (as in Figure 3), a trapezoidal shape, or a semicircular shape. In a specific exemplary embodiment with a triangular cross-section, the three lateral edges may be straight or slightly curved. A trapezoidal cross-section has two parallel lateral edges and two inclined lateral edges, which may also be straight or curved. A semicircular cross-section is a circular arc with a specific radius, wherein the inclined lateral edges are the arc segments that are symmetrical on both sides in the radial direction.

[0087] The connecting grooves 3 formed in this way are arranged uniformly on the inner circumferential side of the yoke part 2 and, after fitting with the connecting projections 4 on the outer circumferential side of the ring body 11, support the optimization of the magnetic flux between the respective stator teeth 12 and the yoke part 2. This reduces the magnetic losses between the two elements and increases the efficiency of the electric motor.

[0088] In some optional exemplary embodiments, an interference fit exists between the inner circumferential side of the yoke part 2 and the outer circumferential side of the ring body 11, resulting in tight contact between the yoke part 2 and the tooth part 1. This allows the connecting projection 4 to engage more firmly in the connecting groove 3, further strengthening the connection and the secure fit between the tooth part 1 and the yoke part 2. Simultaneously, the tight interference fit can effectively increase the thermal conductivity between the tooth part 1 and the yoke part 2, so that during operation of the electric motor, heat can be transferred more quickly from the tooth part 1 to the yoke part 2 and subsequently dissipated via other heat dissipation paths. This contributes to increasing the heat dissipation efficiency of the electric motor and prevents any loss of functional characteristics or damage to the electric motor.

[0089] February 26, 2026

[0090] 16

[0091] This prevents overheating and extends the service life of the electric motor. The good thermal conductivity also ensures uniform temperatures within the electric motor, thus leading to more stable operation. In some optional exemplary embodiments, the yoke part 2 is manufactured by spiral winding and stacking oriented silicon steel strips, wherein the orientation direction of the oriented silicon steel strips of the yoke part is its longitudinal direction and the spiral stacking direction is the axial direction of the stator core 100.

[0092] The wound yoke part 2 forms a ring-shaped structure on the outer circumferential side of the stator core 100 and fits precisely with the tooth part 1.

[0093] Because the yoke part 2 is manufactured by spiral winding and stacking of oriented silicon steel strips, the advantages of the oriented silicon steel in the relevant direction can be fully exploited. In combination with the oriented silicon steel material of the tooth part 1, the magnetic field distribution within the electric motor is further optimized, the magnetic conductivity of the electric motor is increased, and losses due to magnetic hysteresis are reduced, thus increasing the efficiency of the electric motor. At the same time, this design improves the overall material utilization of the stator core 100, enabling comprehensive use of the properties of the oriented silicon steel.

[0094] In some optional exemplary embodiments, the yoke part 2 can be made of non-oriented silicon steel, specifically by the technological process of stamping non-oriented silicon steel strips into specific shapes and subsequently joining or winding them into a ring shape. This is also achieved by providing the outer circumferential side of the ring body 11 of the tooth part 1. This design offers lower costs compared to manufacturing the yoke part 2 from oriented silicon steel, so that in applications where the requirements for the function-P 100M25004WG

[0095] February 26, 2026

[0096] 17

[0097] If the performance characteristics of the electric motor are not particularly high or cost control is required, flexible options are available based on specific needs. This increases the flexibility of the stator core 100 design and expands the product's application range.

[0098] As shown in Figure 1, in some optional exemplary embodiments, several first flow channels 5 are provided on the yoke part 2 and / or the ring body 11, wherein the first flow channels 5 extend in the axial direction of the stator core 100 and serve to allow the flow of coolant. The first flow channels 5 can be circular, semicircular, or rectangular holes, or have other suitable shapes. By providing the first flow channels 5, the coolant is given a direct path to flow within the stator core 100, which greatly increases the heat dissipation efficiency of the stator core 100 and extends the service life of the stator core 100 and the entire electric motor.At the same time, the good heat dissipation properties have a positive effect on maintaining stable temperatures within the electric motor, which increases the reliability and stability of the electric motor's operation and ensures that the electric motor can always maintain good functional properties under different operating conditions.

[0099] In some optional exemplary embodiments, the number of first through-channels 5 is identical to the number of stator teeth 12, and these are arranged one-to-one. For example, each stator tooth 12 is associated with a first through-channel 5 in its vicinity. If the stator teeth 12 are arranged uniformly on the inner circumferential side of the ring body 11, then the first through-channels 5 are also arranged uniformly on the yoke part 2 and / or the ring body 11. The central axis of the first through-channel 5 can be parallel to the central axis of the respective stator tooth 12.

[0100] February 26, 2026

[0101] 18

[0102] The cooling channels run circumferentially. Due to the one-to-one correspondence between the first through-channels 5 and the stator teeth 12, the cooling fluid can dissipate heat more precisely from each individual stator tooth 12. This prevents localized overheating, ensures a uniform temperature distribution throughout the entire stator core 100, and extends the service life of the stator core 100, while simultaneously improving the overall functional characteristics and reliability of the electric motor.

[0103] As shown in Figures 2 and 4, in some optional exemplary embodiments, the first flow channels 5 are located between the yoke part 2 and the ring body 11 and form the flow path for the coolant. Viewed from the radial cross-section of the stator core 100, the first flow channel 5 passes through the area of ​​the yoke part 2 near the ring body 11 and the area of ​​the ring body 11 near the yoke part 2, so that the space between the two elements is continuously connected. Alternatively, the first flow channel 5 passes only through the area of ​​the yoke part 2 near the ring body 11, or the first flow channel 5 passes only through the area of ​​the ring body 11 near the yoke part 2. The specific position of the first flow channel 5 can be between adjacent connecting projections 4 (see Figure 5), above the connecting projection 4 (see Figure 3), or to the side of it, without any restriction in this regard.By positioning the first flow channel 5 between the yoke part 2 and the ring body 11, the flow path of the coolant is optimized. This allows the coolant to reach the relatively heat-generating areas in the stator core 100 more directly. Since the heat generated by the stator teeth 12 is conducted via the ring body 11 to the connection area with the yoke part 2, the coolant flowing here can quickly absorb the heat and thus improve heat dissipation efficiency. This positioning contributes more effectively to lowering the core temperature of the stator core 100.

[0104] 19

[0105] the functional properties of the stator core material 100 and increases the reliability and stability of the electric motor.

[0106] Selecting this position, provided that the overall strength of the stator core 100 is not compromised, allows for comprehensive utilization of the space between the yoke section 2 and the ring body 11. Compared to other positions of the through-channel, this reduces interference with other functional parts of the stator core 100 and facilitates machining during manufacturing, thus reducing machining difficulty and associated costs. Simultaneously, the excellent heat dissipation effect contributes to maintaining stable temperatures within the electric motor, thereby reducing temperature-related fluctuations in the motor's functional characteristics and increasing its operating precision and efficiency.

[0107] As shown in Figure 1, in some optional exemplary embodiments, several secondary flow channels 6 are provided on the outer circumferential side of the yoke part 2, which serve to enable the flow of coolant. For example, several secondary flow channels 6 can be arranged uniformly in the circumferential direction of the yoke part 2, with the respective secondary flow channels 6 extending in the axial direction of the yoke part 2. The shape and size of the secondary flow channels 6 can be designed according to the specific requirements, for example, circular, rectangular, or in another suitable shape.These flow channels run through the thickness direction of the yoke section 2 and are continuously connected to the interior of the stator core 100 (for example, the first flow channel 5 or other coolant flow channels), or are directly and continuously connected to an external cooling system to form an inlet and outlet channel for the coolant or an additional flow channel for heat dissipation. The second flow channel 6 provides an additional flow path for the coolant and primarily supports heat dissipation.

[0108] February 26, 2026

[0109] 20

[0110] the external environment of the yoke part 2, which contributes to a uniform temperature distribution throughout the stator core 100. If the outer casing of the electric motor is connected to the outer circumferential side of the yoke part 2 of the stator core 100 by a press fit, etc., the presence of the second passage 6 can reduce deformations of the yoke part 2 caused by assembly-related stresses. Because these stresses concentrate on the outer circumferential side of the yoke part 2 during assembly, the second passage 6 can perform a stress-distributing function, thus distributing the stresses more evenly. This preserves the structural integrity of the yoke part 2 and ensures the reliability and stability of the connection between the stator core 100 and the outer casing of the electric motor.

[0111] The present application also provides for the provision of a stator assembly, wherein the said stator assembly comprises a winding and the said stator core 100.

[0112] The winding is wound onto the stator teeth 12 of the stator core 100. The winding can consist of electrically conductive materials such as copper wire. Several coils are formed on the stator teeth 12 using a specific winding method (for example, distributed or concentrated winding). These coils, together with the stator core 100, form a complete electromagnetic induction system. The two ends of the windings are connected to an external power source or circuit to provide electric current for generating a magnetic field. The combination of the optimized stator core 100 with the winding forms a complete stator assembly.The magnetic field generated by the winding can be better guided and utilized in the stator core 100 because of the special features of the design and material (for example, the use of oriented silicon steel) of the tooth part 1P 100M25004WG.

[0113] February 26, 2026

[0114] 21

[0115] and the yoke part 2 optimize the magnetic flux, reduce magnetic losses, and enable a more rational magnetic field distribution. This allows the stator assembly to convert electrical energy into mechanical energy with high efficiency during operation of the electric motor, improving the overall functional characteristics of the electric motor so that the requirements for high functional characteristics of an electric motor for new energy-powered vehicles, etc., can be met, for example, by increasing the output power and torque of the electric motor while simultaneously reducing energy losses and improving energy efficiency. The present application also provides an electric motor, wherein said electric motor consists of a rotor and a stator assembly.The rotor is located within the stator assembly and can rotate around its axis under the influence of the magnetic field generated by the stator assembly. A certain gap, known as the air gap, is maintained between the rotor and the stator assembly. The size and uniformity of this air gap significantly influence the operating characteristics of the electric motor. The rotor is mounted on bearings within the outer housing of the electric motor to ensure unimpeded rotation and precise positioning relative to the stator assembly. This enables the interaction between the rotor's magnetic field and the magnetic field generated by the stator assembly, thus enabling energy conversion.

[0116] Due to the outstanding properties of the stator assembly described above, the entire electric motor exhibits higher power density, torque density, and efficiency during operation through the interaction of the rotor and stator assembly. The stator assembly generates a stable and efficient magnetic field in which the rotor rotates under the influence of electromagnetic force, thereby converting electrical energy into mechanical energy.

[0117] 22

[0118] The precise fit and optimal interaction of the rotor and stator assembly ensure trouble-free operation of the electric motor and reduce vibrations and noise. Such an electric motor meets the high demands for functional characteristics, reliability, and comfort, for example, when used as the main drive motor for vehicles powered by renewable energy. This results in greater drive support for vehicles powered by renewable energy, while simultaneously improving the vehicle's range and overall performance, for example, by delivering higher torque during acceleration or uphill driving.Driving at high speed allows for a relatively high efficiency to be maintained, as well as reducing energy consumption, and the smooth operation of the electric motor can reduce noise and vibrations of the vehicle, thus increasing driving comfort.

[0119] In some optional exemplary embodiments, the number of pole pairs of the rotor of the electric motor P, the number of stator teeth 12 of tooth section 1 D, the number of phases of the electric motor m, and the number of slots per pole and phase of the electric motor q, which is calculated by the equation q = D / 2mP and is crucial for the details of the winding arrangement on the stator teeth 12, are all relevant. With a concentrated winding with q of 1 / 2, 1 / 4, or 2 / 5, the windings in each slot of each phase are concentrated under each pole. Such an arrangement simplifies winding fabrication and, in certain electric motor designs, meets the requirements for magnetic field distribution and torque output.For example, in a concentrated winding with q = 1 / 2, only half of the slots of each phase under each pole are occupied by the winding. This results in a relatively compact winding arrangement and allows for high torque, but can lead to a higher proportion of magnetic field harmonics and necessitates corresponding optimization measures. In a distributed winding with q = N as positive P 100M25004WQ.

[0120] February 26, 2026

[0121] 23

[0122] With a whole number of q, the winding is more evenly distributed in the slots of each phase under each pole. This distribution contributes to the reduction of magnetic field harmonics and to the improvement of the efficiency and stability of the electric motor's operating characteristics, although the winding process is relatively complex. For example, a distributed winding with q = 3 occupies three slots per phase under each pole. The winding is also more evenly distributed across the stator teeth 12, resulting in a more sinusoidal magnetic field, which reduces torque ripple and energy losses.

[0123] Different Q-value options (concentrated or distributed winding) can meet the requirements of various applications. A concentrated winding is advantageous for applications with high torque requirements, cost sensitivity, and less stringent requirements regarding magnetic field harmonics, such as auxiliary drive motors in some small electric vehicles or certain industrial applications. A distributed winding, on the other hand, is suitable for applications with high demands on the electric motor's functional characteristics and stringent requirements for operational stability and efficiency, such as main drive electric motors for renewable energy vehicles or certain high-precision industrial equipment.This flexibility allows electric motors to offer optimal functional characteristics in different areas and under different operating conditions, thus improving universal applicability and adaptability.

[0124] A well-considered parameter design simultaneously contributes to improving the energy conversion efficiency of the electric motor, reducing energy losses, decreasing heat generation during operation, extending the motor's service life, and optimizing its dynamic characteristics, such as starting behavior, speed control, and overload capacity, to meet various complex operating requirements. P 100M25004WQ

[0125] February 26, 2026

[0126] 24

[0127] The foregoing provides a detailed description of an exemplary embodiment of the present application; however, this merely represents an advantageous exemplary embodiment of the present application and must not be interpreted as limiting the scope of exemplary embodiments of the present application. All equivalent modifications, improvements, etc., made within the scope of the present application are covered by the scope of protection of the present application.

[0128] It should be noted that the terms "first", "second", and similar terms used in this application do not in any way express a specific order, number, or importance, but merely serve to distinguish between different components. Directional indications used in this application, such as "left", "right", "left side", "right side", "upper part", "lower part", "top", "bottom", etc., are all defined by the orientation or positional relationships shown in the accompanying figures and serve only to facilitate and simplify the description of this application, without explicitly or implicitly implying that the described constructions must be designed or operated in a specific orientation, so that these indications must not be understood as limiting the present application.In the description of this application, the term "several" means two or more, unless expressly defined otherwise. In the description of this application, the terms "assembly," "connection," and "connection" are to be understood in a broad sense, unless expressly defined otherwise. For example, it may be a fixed connection, just as it may be a detachable connection or an inseparable connection. It may be a direct connection, just as it may be a connection with P 100M25004WG.

[0129] February 26, 2026

[0130] 25

[0131] This could involve a direct connection via an intermediate medium or an internal continuous connection between two components. An average person skilled in the relevant technical field can understand the specific meaning of the terms mentioned in the present application based on the specific circumstances.

[0132] *****

Claims

February 26, 2026 26 Claims 1. Stator core, characterized in that the said stator core detachably comprises a tooth part and a yoke part, wherein the said tooth part comprises a ring body and several stator teeth arranged uniformly on the inner circumferential side of the said ring body, wherein the said tooth part is produced by spiral winding and stacking of oriented silicon steel strips, wherein the orientation direction of the said oriented silicon steel strips of the said tooth part is the extension direction of the stator teeth and the spiral stacking direction is the axial direction of the said stator core, wherein the said yoke part is provided around the outer circumferential side of the said ring body, wherein the inner circumferential side of the said yoke part is fastened to the outer circumferential side of the said ring body by means of suitable connecting grooves and connecting projections, wherein the said connecting projections engage in the said connecting grooves.

2. Stator core according to claim 1, characterized in that the said connecting grooves, the said connecting projections and the said stator teeth are each provided one to one corresponding to each other.

3. Stator core according to claim 2, characterized in that the said connecting groove is provided on the inner circumferential side of the said yoke part, wherein the said connecting projection is provided on the outer circumferential side of the said ring body, wherein the 26.02.2026 27 The opening of said connecting groove points towards the central axis of said stator core, wherein the groove width of said connecting groove gradually widens in the direction of said opening, wherein said connecting groove has side edges located on both radial sides of said stator core, wherein said side edges located on both sides are each inclined in the radial direction with respect to said stator core.

4. Stator core according to claim 3, characterized in that the base width I of said connecting projection and the length L of any side edge are each not smaller than the minimum width H of said stator tooth.

5. Stator core according to claim 3, characterized in that the cross-section of said connecting groove generally has a triangular, trapezoidal or semicircular shape in the radial direction of said stator core.

6. Stator core according to claim 1, characterized in that an interference fit exists between the inner circumferential side of the said yoke part and the outer circumferential side of the said ring body.

7. Stator core according to claim 1, characterized in that the yoke part is produced by spiral winding and stacking of oriented silicon steel strips, wherein the orientation direction of the oriented silicon steel strips of the yoke part is its longitudinal direction and the spiral stacking direction is the axial direction of the stator core. or 26.02.2026 28 The aforementioned yoke part is made of non-oriented silicon steel by stamping or spiral winding and stacking.

8. Stator core according to claim 1, characterized in that several first passage channels are provided on the said yoke part and / or the said ring body, wherein the said first passage channels extend in the axial direction of the said stator core, wherein the said first passage channels serve to enable the flow of cooling fluid.

9. Stator core according to claim 8, characterized in that the number of said first through-channels is identical to the number of said stator teeth and these are provided one-to-one with each other.

10. Stator core according to claim 8, characterized in that the first passage channels are located between the yoke part and the ring body.

11. Stator core according to any one of claims 1 to 10, characterized in that several second passage channels are provided on the outer circumferential side of the said yoke part, which serve to enable the flow of cooling fluid.

12. Stator assembly, characterized in that said stator assembly comprises a winding and a stator core according to any one of claims 1 to 11. 26.02.2026 29 13. Electric motor, characterized in that the electric motor comprises a rotor and a stator assembly according to claim 12, wherein the rotor is rotatably provided within the stator assembly.

14. Electric motor according to claim 13, characterized in that the number of pole pairs of the rotor of said electric motor is P, the number of stator teeth of said stator tooth part is D, the number of phases of said electric motor is m and the number of slots per pole and phase is q = D / 2mP, wherein q is a concentrated winding of 1 / 2, 1 / 4 or 2 / 5 or a distributed winding with a positive integer N.

Images