Electric motor stator core structure

Abstract

The exemplary embodiments of the invention relate to an electric motor stator core structure, wherein the electric motor stator core structure comprises a stator yoke part and a stator tooth part, and the inner diameter side of the stator yoke part is designed to match the outer diameter side of the stator tooth part by means of a clamping connection. The stator tooth part is in the form of a ring made by connecting the front and rear end of a tooth-part chain, wherein oriented silicon steel is used for the tooth-part chain and the orientation direction of the oriented silicon steel is the extension direction of the stator teeth in the tooth-part chain. The outer circumferential surface of the stator tooth part has at least one process opening, and the yoke part and the tooth part of the electric motor stator core are independent structures, in which oriented silicon steel is used for the stator tooth part and a structure in the form of a chain is used for the stator tooth part. In addition, process openings are formed on the outer diameter side of the stator tooth part in order to absorb the deformations arising during the welding and winding of the tooth-part chain and thus prevent adverse effects resulting from the assembly of the stator tooth part and stator yoke part. Overall, the electric motor stator core structure is simple and easy to produce. The design of the tooth part in the form of a chain reduces the equivalent air gap in the stator and thus prevents adverse effects due to the use of the oriented silicon steel.

Description

[0001] 23.02.2026

[0002] 1

[0003] Electric motor stator core design

[0004] Technical field

[0005] The present invention relates to the technical field of electric motors, in particular an electric motor stator core construction.

[0006] State of the art

[0007] For electric motors, which are core components of vehicles powered by new energy sources, operating efficiency, comfort, and cost-effectiveness are of particular importance. Due to iron and mechanical losses in electric motors, the operating efficiency of conventional drive electric motors rarely meets the requirements for the functional characteristics of vehicles powered by new energy sources over the long term.

[0008] To reduce such iron losses and increase operational efficiency, oriented silicon steel is currently used instead of conventional non-oriented silicon steel as the material for manufacturing the core of drive electric motors.

[0009] As shown in Figure 1, the design in question features a construction with a separate tooth section and yoke section, wherein the yoke section T of the stator is a one-piece construction made of non-oriented silicon steel, while oriented silicon steel is used for the tooth section 2'. The tooth section 2' of the stator is segmented, and these segments are ultimately assembled into a single unit. In the described design, oriented silicon steel is used to increase magnetic saturation and the P 100M25003WQ

[0010] February 18, 2026

[0011] 2

[0012] Torque density of the electric motor, although the high number of segments increases the technological difficulty and makes mass production difficult.

[0013] To solve the aforementioned problems, a new stator core design was proposed, for which, as shown in Figures 2 and 3, a construction with a separate toothed section and yoke section is provided. The stator yoke section is a chain construction consisting of several elongated yoke units 4' and several curved sections, with the toothed section also being a single-piece construction formed by the successive connection of several toothed units 3' to form a chain construction. Theoretically, this design reduces the number of cores in the yoke section and decreases the technological difficulty. However, the closing of the stator slots and the widening of the equivalent air gap of the chain-type yoke section result in a significant reduction of the effect of using oriented silicon steel.

[0014] Therefore, there is a need for a concept for a stator core design that uses oriented silicon steel and reduces the technological difficulty, while at the same time not impairing the effect of using oriented silicon steel, so that iron losses of the drive electric motor can be effectively reduced while increasing the operating efficiency of the drive electric motor.

[0015] Subject matter of the invention

[0016] The objective of the present invention is to solve at least one of the problems in the prior art. To this end, the present invention provides an electric motor stator core P 100M25003WQ.

[0017] February 18, 2026

[0018] 3

[0019] Design to achieve the effects of a simple design without compromising the realization of the application effects of oriented silicon steel, while simultaneously enabling simple manufacturing.

[0020] In particular, the present invention provides an electric motor stator core construction, wherein said electric motor stator core construction comprises a stator yoke part and a stator tooth part, wherein the inner diameter side of said stator yoke part is provided to fit the outer diameter side of the stator tooth part by means of a clamping connection.

[0021] wherein the aforementioned stator tooth part is a ring shape formed by connecting the front and rear ends of a tooth part chain, wherein oriented silicon steel is used for the aforementioned tooth part chain, wherein the orientation direction of the aforementioned oriented silicon steel is the extension direction of the stator teeth in the tooth part chain,

[0022] wherein the outer circumferential surface of the aforementioned stator tooth part has at least one process opening.

[0023] The yoke and tooth sections of the electric motor stator core are independent structures. Oriented silicon steel is used for the stator tooth section, which employs a chain-like design. Process openings are formed on the outer diameter side of the stator tooth section to accommodate deformations occurring during welding and winding of the tooth section chain, thus preventing any impairment of the assembly result of the stator tooth and yoke sections. The electric motor stator core structure is generally simple and easy to manufacture. The tooth section design is inP 100M25003WQ.

[0024] February 18, 2026

[0025] 4

[0026] The chain design reduces the equivalent air gap in the stator and thus avoids any impairment of the effect of using oriented silicon steel.

[0027] In an exemplary embodiment of the aforementioned electric motor stator core construction, the aforementioned tooth chain comprises at least two tooth element components, each of which comprises stator teeth.

[0028] wherein the width of the said stator teeth in the circumferential direction at one end of the outer diameter side of the said stator tooth part is greater than or equal to the width in the circumferential direction at one end of the inner diameter side of the said stator tooth part.

[0029] By ensuring that the width of the stator teeth in the tooth element of the stator tooth part is greater than or equal to the width in the circumferential direction at one end of the outer diameter side of the stator tooth part, magnetic losses of the electric motor can be effectively reduced, which increases the operating efficiency of the drive electric motor.

[0030] In an exemplary embodiment of the aforementioned electric motor stator core construction

[0031] First extension sections extend circumferentially to both sides of the aforementioned stator teeth at one end of the inner diameter side of the aforementioned stator tooth section, with an intermediate gap provided between two adjacent first extension sections of the stator teeth. 18.02.2026

[0032] 5

[0033] From the aforementioned stator teeth, second extensions extend circumferentially at one end of the outer diameter side of the stator tooth section, with a connection provided between two adjacent second extensions of the stator teeth. The process opening is located at the connection point of these two adjacent second extensions of the stator teeth on the surface facing away from the first extensions. Because the stator teeth are connected by second extensions and the process opening is located at the connection point of two adjacent second extensions of the stator teeth on the surface facing away from the first extensions, the deformations caused by welding and bending the stator teeth can be absorbed to a maximum extent, thus ensuring that the assembly result of the stator tooth section and the stator yoke section is not impaired.

[0034] In an exemplary embodiment of the aforementioned electric motor stator core construction, the projection of the aforementioned process opening in the direction of the central axis of the aforementioned stator core on the end surface of the aforementioned stator core has any of the following shapes: triangular, trapezoidal or rectangular.

[0035] The effect of absorbing deformations is further improved by ensuring that the projection of the process opening towards the central axis of the aforementioned stator core on the end surface of the stator core has any of the following shapes: triangular, trapezoidal or rectangular.

[0036] In an exemplary embodiment of the aforementioned electric motor stator core construction, the aforementioned tooth element also comprises a projection extending towards the aforementioned stator yoke part. P 100M25003WQ

[0037] February 18, 2026

[0038] 6

[0039] The stator tooth part of the electric motor has a projection extending from its outer circumference towards the stator yoke part, this projection corresponding to the easily magnetizable direction of the stator teeth made of oriented silicon steel, thereby reducing magnetic losses and increasing the operating efficiency of the electric motor.

[0040] In an exemplary embodiment of the aforementioned electric motor stator core construction, the orientation direction of the oriented silicon steel of the aforementioned projection part coincides with the orientation direction of the aforementioned stator tooth part.

[0041] In the aforementioned electric motor stator core construction, the aforementioned projection part is a shape having side edges, for example a triangular shape or trapezoidal shape, wherein the side edge length of the projection part is L, wherein the minimum width of the aforementioned stator teeth on the first extension part is H, where L > H.

[0042] This is because H is the range of maximum magnetic resistance of the toothed part. To ensure that the magnetic resistance at the junction with the yoke does not exceed the maximum magnetic resistance of the toothed part, the requirement L < H stated above applies. If the magnetic resistance at the junction with the yoke is excessively high, this creates a bottleneck due to magnetic resistance in the magnetic circuit.

[0043] In an exemplary embodiment of the aforementioned electric motor stator core construction, the aforementioned tooth segment chain is formed by connecting several circumferentially arranged tooth segment units, wherein the number of the aforementioned tooth segment units is greater than or equal to twice the number of teeth. 18.02.2026

[0044] 7

[0045] The number of rotor pole pairs of the electric motor is less than the number of stator slots in the aforementioned electric motor stator core.

[0046] Because the number of tooth division units is greater than or equal to twice the number of rotor pole pairs of the electric motor and less than the number of stator slots in the electric motor stator core, there is an enormous improvement in the material utilization of the oriented silicon steel, as well as an improvement in the power density, torque density and high-performance range of the electric motor, so that the electric motor has a higher price-performance ratio.

[0047] In an exemplary embodiment of the aforementioned electric motor stator core construction,

[0048] The two ends of the aforementioned tooth assembly are each provided with a clamping connector and a clamping connection groove that matches the aforementioned clamping connector.

[0049] The segmented tooth units are connected to each other by clamps, which facilitates manufacturing and assembly and reduces iron losses.

[0050] In an exemplary embodiment of the present electric motor stator core construction, the tooth element mentioned is in its longitudinal direction a straight shape or a curved shape suitable for the stator yoke part mentioned.

[0051] In an exemplary embodiment of the aforementioned electric motor stator core construction, it is provided that if the aforementioned stator yoke part is a stator yoke part made of oriented silicon steel, the 18.02.2026

[0052] 8

[0053] The aforementioned stator yoke part is produced by spirally winding and stacking an oriented yoke part steel strip, wherein the orientation direction of the oriented yoke part steel strip is its longitudinal direction.

[0054] Because, if the stator yoke is made of oriented silicon steel, and the stator yoke is manufactured by spiral winding and stacking of an oriented yoke steel strip, the orientation direction of the oriented yoke steel strip is its longitudinal direction, there is agreement with the direction of the magnetic flux during operation of the electric motor, which reduces magnetic losses.

[0055] Further aspects and advantages of the present invention are partly set out in the following description, partly become apparent from the present description, or can be ascertained through the practical application of the invention.

[0056] Explanation of the figures

[0057] The disclosed content of the present invention becomes even clearer with reference to the accompanying figures. A person skilled in the relevant technical field will readily understand that the accompanying figures serve only for illustration and do not imply any limitation of the scope of protection of the present invention. Identical reference numerals in the accompanying figures denote identical or similar parts.

[0058] Figure 1 schematically shows the construction of a stator core in a state-of-the-art design with a separate toothed section and yoke section. 18.02.2026

[0059] 9

[0060] Figure 2 schematically shows the construction of a stator core in an embodiment with a separate tooth part and yoke part, as well as the use of a construction with a stator yoke part in chain design according to the prior art.

[0061] Figure 3 schematically shows the arrangement pattern of the tooth chain of the stator core from Figure 2.

[0062] Figure 4 schematically shows the construction of an electric motor stator core construction according to an exemplary embodiment of the present application.

[0063] Figure 5 shows the front view of the tooth chain of the stator core construction without welding according to an exemplary embodiment of the present application.

[0064] Figure 6 shows the construction of the stator tooth part formed by welding the tooth chain into the stator core construction according to an exemplary embodiment of the present application.

[0065] Figure 7 schematically shows two adjacent tooth element components from the tooth component chain of the stator core construction according to an exemplary embodiment of the present application.

[0066] Figure 8 schematically shows the construction of a stator core construction according to a further exemplary embodiment of the present application.

[0067] Figure 9 shows the three-dimensional view of a tooth unit of the stator core construction according to an exemplary embodiment of the present application, P 100M25003WG

[0068] February 18, 2026

[0069] 10

[0070] Figure 10 shows the front view of a tooth unit of the stator core construction according to an exemplary embodiment of the present application.

[0071] Figure 11 schematically shows the construction of the stator yoke part in a stator core construction according to an exemplary embodiment of the present application.

[0072] Reference symbols: 1. Stator yoke part, 11. Oriented yoke part steel strip, 2. Stator tooth part, 21. Tooth part chain, 211. Stator tooth, 212. First extension part, 213. Second extension part, 214. Projection part,

[0073] K. Welding position, 22. Process opening, 23. Tooth division unit, 231. Clamping connector, 232. Clamping groove, T. Yoke part, 2'. Tooth part, 3'. Tooth division unit, 4'. Yoke part unit.

[0074] Specific exemplary embodiments

[0075] The following is a detailed description of some exemplary embodiments of the present invention with reference to the accompanying figures. A person skilled in the relevant technical field should understand that these exemplary embodiments serve only to illustrate the technical principle of the present invention, without limiting the scope of protection of the present invention in any way.

[0076] As explained in the section on the state of the art, the operating efficiency of an electric motor can be increased quickly and effectively by reducing iron losses. For the core material of conventional permanent magnet synchronous electric motors of compressors, 18.02.2026

[0077] 11

[0078] Typically, non-oriented electrical steel is used. The magnetic saturation of electrical steel is limited, which restricts the functional characteristics of an electric motor under certain operating conditions. For example, during operation at high speeds or high torques, the stator core of the electric motor, particularly the stator teeth, becomes magnetically saturated due to the increased magnetic flux density at a certain tooth width and the associated limited dimensions of the electric motor. Once magnetic saturation is reached at any point, this inevitably leads to significant iron losses in the electric motor and thus to a reduction in its efficiency.

[0079] Based on the problems described above, cores made of oriented silicon steel for permanent magnet synchronous electric motors are currently being increasingly developed. Such cores primarily utilize segmented oriented silicon steel technology, but are designed exclusively for cores with concentrated windings. Furthermore, the large number of segments in the toothed section increases the technological difficulty of manufacturing. Despite improvements made in this area, significant efficiency losses still occur, considerably reducing the benefits of using oriented silicon steel.

[0080] When distributed windings with multiple slots are used in motor vehicles powered by new energies, such technological problems become even more serious.

[0081] To solve the problems described, the present application proposes a creative electric motor stator core design, dated 18.02.2026

[0082] 12

[0083] The stator yoke and stator tooth sections are designed to fit together via a clamping connection. Oriented silicon steel is used, at least for the manufacture of the stator tooth section. The tooth section is formed by connecting the front and rear ends of a tooth chain, and process openings are provided on the outer circumferential side of the tooth chain to accommodate deformations that occur during the joining and bending of the tooth chain.

[0084] The overall design is simple and easy to manufacture, and the equivalent air gap in the stator is reduced, thus avoiding any impairment of the effect of using oriented silicon steel.

[0085] The present invention will be explained in more detail below with reference to specific exemplary embodiments.

[0086] Specifically, exemplary embodiments of the present invention provide an electric motor stator core construction in which, as shown in Figure 4, the stator core construction comprises a stator yoke part 1 and a stator tooth part 2, wherein the inner diameter side of the stator yoke part 1 is appropriately provided by a clamping connection to the outer diameter side of the stator tooth part 2.

[0087] As shown in Figures 5 to 7, the stator tooth part 2 is a ring shape formed by connecting the front and rear ends of a tooth chain 21, wherein oriented silicon steel is used for the tooth chain 21, the orientation direction of the oriented silicon steel being the extension direction of the stator teeth in the tooth chain 21, wherein the outer circumferential surface of the stator tooth part 2 has at least one process opening 22. By way of example, it is provided that on 18.02.2026

[0088] 13

[0089] the stator tooth part 2 is a ring shape formed by the connection of the front and rear ends of the tooth part chain 21.

[0090] A process opening 22 for accommodating deformations is provided on the outer diameter side of the toothed chain 21. The at least one process opening is located on the outer circumferential surface of the stator toothed section 2, corresponding to the welding position K of the toothed chain 21. As shown in Figure 6, the end faces of the two ends of the toothed chain 21 are welded together after the appropriate connection. The location of the appropriate connection of the two end faces is the welding position K. After the appropriate connection and welding of the two end faces, the at least one process opening 22 is formed on the outer circumferential surface, corresponding to the welding position K, i.e., on the connection line on the outer diameter side of the location of the appropriate connection.

[0091] The yoke and tooth sections of the electric motor stator core are independent structures. Oriented silicon steel is used for the stator tooth section 2, and a chain-type design is employed for the stator tooth section 2. Furthermore, process openings 22 are formed on the outer diameter side of the stator tooth section 2 to accommodate the deformations that occur during the connection of the front and rear ends of the tooth section chain 21 and the winding process, thus preventing any impairment of the assembly result of the stator tooth section 2 and the stator yoke section 1. The electric motor stator core structure is generally simple and easy to manufacture. The chain-type design of the tooth section reduces the equivalent air gap in the stator and thus avoids any impairment of the effect of using oriented silicon steel. 18.02.2026

[0092] 14

[0093] In some exemplary embodiments, as shown in Figures 5 to 7, the tooth chain 21 comprises at least two tooth element components, each of which comprises stator teeth 211, wherein the circumferential width of the stator teeth 211 at one end of the outer diameter side of the stator tooth component 2 is greater than or equal to the circumferential width at one end of the inner diameter side of the stator tooth component 2. This means that the side length of the quadrilateral projected onto the outer diameter side of the stator tooth 2 is greater than or equal to the side length of the side projected onto the inner diameter side of the stator tooth 2.

[0094] The stator tooth 211 has a specific thickness that corresponds to its length in the axial direction of the stator core. The orthogonal projection of the stator tooth 211 onto the end face of the stator core in the direction of the central axis of the stator core can be rectangular or trapezoidal.

[0095] The circumferential width of the stator tooth 211 at one end of the outer diameter side of the stator tooth section 2 is greater than or equal to the circumferential width at one end of the inner diameter side of the stator tooth section. This means that if the orthogonal projection of the stator tooth 211 onto the end face of the stator core in the direction of the central axis of the stator core is rectangular, the length of the parallel side facing away from the center of the stator core is equal to the length of the parallel side facing the center.In a trapezoidal orthogonal projection of the stator tooth 211 along the central axis of the stator core onto the end face of the stator core, the two parallel sides of the trapezoidal orthogonal projection are, respectively, the two sides facing away from the center of the stator core and the two sides facing towards the center, wherein the length of the parallel side facing away from the center of the stator core is greater than the length of the parallel side facing towards the center. P 100M25003WQ.

[0096] February 18, 2026

[0097] 15

[0098] By ensuring that the width of the stator tooth 211 of the stator tooth part in the circumferential direction at one end of the outer diameter side of the stator tooth part 2 is greater than or equal to the width in the circumferential direction at one end of the inner diameter side of the stator tooth part 2, magnetic losses of the electric motor can be effectively reduced, which increases the operating efficiency of the drive electric motor.

[0099] In some exemplary embodiments, as shown in Figure 7, first extension parts 212 extend circumferentially to both sides from the stator teeth 211 at one end of the inner diameter side of the stator tooth part, wherein an intermediate gap is provided between two adjacent first 212 extension parts of the stator teeth 211, which forms the toothed end of the stator tooth part.

[0100] Second extensions 213 extend circumferentially from one end of the outer diameter side of the stator tooth section 2 of the stator teeth 211, with a connection provided between two adjacent second extensions 213 of the stator teeth 211. The process opening 22 is provided at the connection point of the two adjacent second extensions 213 of the stator teeth 211 on the surface facing away from the first extensions 212.

[0101] Specifically, it is provided that a process opening 22 is provided at the connection point of two adjacent second extension sections 213 of the stator teeth 211 on the surface facing away from the first extension sections 212. Because the stator teeth 211 have a certain thickness in the axial direction of the stator core, a process opening 22 can be provided at the connection point of two adjacent second extension sections 213 of the stator teeth 211 on the surface facing away from the first extension sections 212, as well as at least two process openings 22.

[0102] 16

[0103] can be provided. If at least two process openings 22 are provided at the junction of two adjacent second extension parts 213 of the stator teeth 211 on the surface facing away from the first extension parts 212, the two process openings 22 are arranged at identical intervals along the direction parallel to the central axis of the stator core, and the number of process openings 22 at the junction of each two adjacent second extension parts 213 is identical, as is their spacing.

[0104] Because the stator teeth 211 are connected by second extension parts 213 and the process opening 22 is provided at the connection point of two adjacent second extension parts 213 of the stator teeth 211 on the surface facing away from the first extension parts 212, the deformations caused by welding and bending the stator teeth can be absorbed to a maximum extent, so that it is ensured that there is no impairment of the assembly result of stator tooth part 2 and stator yoke part 1.

[0105] In some exemplary embodiments, the projection of the process opening 22 in the direction of the central axis of the stator core onto the end face of the stator core has any triangular, trapezoidal, or rectangular shape. By having the projection of the process opening 22 in the direction of the central axis of the stator core onto the end face of the stator core having any triangular, trapezoidal, or rectangular shape, the effect of absorbing deformations caused by bending of the toothed chain 21 is further improved.

[0106] In some exemplary embodiments, the aforementioned tooth element also comprises a projection part 214 extending in the direction of the stator yoke part 1, wherein the direction of extension of the P 100M25003WQ

[0107] February 18, 2026

[0108] 17

[0109] the projection part 214 coincides with the rolling direction of the stator tooth part 2, wherein the rolling direction of the stator tooth part 2 is the radial direction of the stator core.

[0110] By having a projection 214 extending from its outer circumference towards the stator yoke 1, wherein the direction of extension of the projection 214 coincides with the rolling direction of the stator tooth 2 and wherein the rolling direction of the stator tooth 2 is the radial direction of the stator core, the direction of extension of the projection 214 coincides with the easily magnetizable direction of the stator tooth made of oriented silicon steel, thereby reducing magnetic losses and increasing the operating efficiency of the electric motor.

[0111] In some exemplary embodiments, the orientation direction of the oriented silicon steel of the said projection part 214 coincides with the orientation direction of the stator tooth part 2.

[0112] In some exemplary embodiments, the projecting part 214 is a shape having side edges, wherein the side edge length of the projecting part 214 is L,

[0113] where the minimum width of the aforementioned stator teeth at the first extension part is 212 H,

[0114] where L > H.

[0115] Preferably, the projection 214 and the stator tooth 211 have the same thickness in the axial direction of the stator core. The orthogonal projection of the projection 214 onto the end face of the stator core is 18.02.2026

[0116] 18

[0117] Triangular, where triangular is understood to mean a shape with smooth, rounded corners. A triangular shape consists of a first, a second, and a third side, which are adjacent to one another. The first side is collinear with the side of the quadrilateral that adjoins one end of the outer circumferential surface of the stator tooth part 2. The second and third sides are the lateral edges of the projection part 214. The collinearity of the first side and the edge of the stator tooth part 2 that adjoins the projection of the quadrilateral means that the first side and the edge of the stator tooth part 2 that adjoins the projection of the quadrilateral lie on the same line. The collinearity of the first side and the edge of the stator tooth part 2 that adjoins the projection of the quadrilateral can have the same starting and ending points, as well as different starting and ending points.Likewise, it is possible to have the same starting point with a different endpoint or the same endpoint with a different starting point.

[0118] In the projection of the triangular shape, the angle of the vertex relative to the first side is 50° to 120°. For example, one side of the projection portion 214 coincides with the edge of the stator tooth 211 facing away from the central axis of the stator core, and the angle opposite this side can be 50°, 53°, 55°, 57°, 60°, 65°, 70°, 75°, 80°, 90°, 100°, 110°, 120°, or any value within this angular range. Preferably, the vertex angle relative to the first side in the triangular projection is 50° to 60°. The lengths of the second and third sides are each greater than or equal to the circumferential width of the stator tooth 211 at one end of the inner diameter side of the stator tooth portion 2.Since the stator tooth 211 is located at the end of the inner diameter side of the stator tooth part 2, where the magnetic resistance of the tooth part is greatest, the above requirement serves to ensure that the magnetic resistance at the yoke part connection does not exceed the maximum magnetic resistance of the tooth part. Without this design, the magnetic resistance at the P 100M25003WQ would be

[0119] February 18, 2026

[0120] 19

[0121] The yoke connection is excessively high and would represent a bottleneck in the magnetic circuit.

[0122] The second and third sides can be of equal or different lengths. Regardless of whether the second and third sides are of equal length or not, their length is at least the circumferential width of the stator tooth 211 at one end of the stator tooth portion 2 on the inner diameter side. This means that the length of the side of the projection portion 214 is at least as long as the minimum width of the stator tooth on the first extension portion 212. Preferably, the second and third sides are of equal length, resulting in a more symmetrical and aesthetically pleasing design that is also easier to manufacture.

[0123] It should be noted that in the present exemplary embodiment, the stator teeth 211, the first extension part 212, the second extension part 213, and the projection part 214 serve only to simplify the description. In reality, the stator teeth 211, the first extension part, the second extension part 213, and the projection part 214 are formed as a single piece.

[0124] In some exemplary embodiments, see Figure 8, the tooth chain 21 is formed by connecting several tooth unit units 23 arranged in the circumferential direction,

[0125] where the number of the aforementioned tooth subdivision units 23 is greater than or equal to twice the number of rotor pole pairs of the electric motor and less than the number of stator slots in the stator core.

[0126] Because in the toothed chain the number of toothed unit units 23 is greater than or equal to twice the number of rotor pole pairs of the electric motor and P 100M25003WG

[0127] February 18, 2026

[0128] 20

[0129] If the number of stator slots in the stator core is smaller than the number of slots, the material utilization of the silicon steel, the power density, the torque density and the efficiency of the electric motor are significantly increased, which improves the price-performance ratio.

[0130] In a preferred embodiment, the toothed chain 21 consists of an even number of interconnected toothed units 23, wherein all toothed units 23 are identical in shape and size, which, after assembly, results in a more uniform force distribution during operation of the electric motor, reduced wear, and simpler assembly. For example, the stator toothed section 2 consists of eight identical toothed units 23, the front and rear ends of which are appropriately connected.

[0131] As shown in Figure 9, it is preferably provided that both ends of the tooth division unit 23 are provided with a clamping connector 231 and a corresponding clamping groove 232.

[0132] The clamping connector 231 can, for example, be triangular or arc-shaped.

[0133] In a triangular clamping connector 231, the angle between the clamping connector 231 and the toothed indexing unit 23 is preferably 30° to 60°. For example, the angle between the clamping connector 231 and the toothed indexing unit 23 can be 30°, 35°, 40°, 45°, 50°, 55°, 60°, or any value within this range. The angle of the clamping connector 231 away from the toothed indexing unit 23 is preferably 30° to 60°, which is relatively acute and facilitates the insertion of the clamping connector 231 into the clamping groove.

[0134] February 18, 2026

[0135] 21

[0136] The segmented tooth units 23 are connected to each other by a triangular or arc-shaped clamping connection. This simplifies manufacturing and assembly and reduces material waste.

[0137] Similar to the tooth segment element in the tooth segment chain 21, the tooth segment unit 23 also comprises a stator tooth, a first extension part and a second extension part extending outwards from both ends of the stator tooth, and a projection part, although at the connection point of the second extension part of the tooth segment unit 23 there is no

[0138] Process opening 22 is provided. The orthogonal projection of the protruding part of the tooth unit 23 onto the end face of the stator core is a trapezoid, the longer of the two parallel sides of which coincides with the edge of the end face of the stator tooth on the outer diameter side of the stator core. In both the tooth element and the tooth unit 23, the thicknesses of the first extension part 212, the second extension part 212, and the protruding part 214 in the axial direction of the stator core correspond to the thickness of the stator tooth 211 in the axial direction of the stator core.

[0139] In some embodiments, the tooth element has a straight shape in its longitudinal direction or a curved shape that fits the stator yoke part 1.

[0140] Because the tooth element has a straight shape in its longitudinal direction or a curved shape that matches the aforementioned stator yoke part 1, an interference fit between the stator yoke part 1 and the stator tooth part 2 is enabled, thus forming the stator core. This design is easy to assemble and offers a stable and robust structure. The interference fit between the stator yoke part 1 and the stator tooth part 2 also ensures the axial positioning of the stator tooth part 2.

[0141] February 18, 2026

[0142] 22

[0143] stator core and thus prevents its components from shifting in the axial direction.

[0144] In some exemplary embodiments, if the stator yoke part 1 is made of oriented silicon steel and is manufactured, as shown in Figure 11, by spirally winding and stacking an oriented yoke steel strip 11, the orientation direction of the oriented yoke steel strip 11 is its longitudinal direction. This means that the winding direction of the oriented yoke steel strip 11 coincides with the rolling direction of the stator yoke part 1, wherein the oriented yoke steel strip 11 is spirally wound and stacked in the circumferential direction of the stator core. The rolling direction of the stator yoke part 1 is the circumferential direction of the stator core.

[0145] Since, if the stator yoke part 1 is a stator yoke part made of oriented silicon steel, the winding direction of the oriented yoke steel strip 11 of the stator yoke part 1 produced by spiral winding and stacking is its longitudinal direction and the winding is carried out in the circumferential direction of the stator core, there is agreement with the direction of the magnetic flux during the operation of the electric motor, which reduces losses of the magnetic circuit.

[0146] As shown in Figure 1, the oriented yoke steel strip 11 is a thin, flat strip with a specific width and a toothed edge at one end. During spiral winding and stacking of the oriented yoke steel strip 11, the toothed edge overlaps in the thickness direction of the oriented yoke steel strip 11, thus forming a groove for a suitable clamping connection with the outer diameter surface of the stator tooth part 2. The edges of the oriented yoke steel strip 11 opposite the toothed edge overlap.

[0147] February 18, 2026

[0148] 23

[0149] themselves and form a smooth outer circumferential surface of the cylindrical stator yoke part 1.

[0150] In the present description, terms such as "an exemplary embodiment", "some

[0151] The terms "exemplary embodiments," "exemplar embodiment," "specific embodiment," or "some exemplary embodiments" indicate that a particular feature, structure, material, or property described in connection with the respective exemplary embodiment or embodiment is included in at least one exemplary embodiment or embodiment of the present invention. The exemplary expressions using these terms do not necessarily refer to the same exemplary embodiment or embodiment in the present invention. Furthermore, the specific features, structures, materials, or properties described may be combined in any suitable manner in one or more exemplary embodiments or embodiments.

[0152] The terms "first" and "second" are used for descriptive purposes only and should not be interpreted as an explicit or implicit indication of their relative importance or as an implicit indication of the number of the technical features in question. Thus, features defined as "first" or "second" may explicitly or implicitly include at least one of the features in question. In the description of the present invention, "several" means at least two, for example, two, three, etc., unless a different definition is expressly given. 18.02.2026

[0153] 24

[0154] Although exemplary embodiments of the present invention have been shown and described above, it is understood that these embodiments are merely exemplary and should not be interpreted as limiting the present invention. A person skilled in the art in the relevant technical field can make changes, embellishments, equivalent substitutions, or modifications to the exemplary embodiments mentioned within the scope of the present invention.

Claims

23. 02.2026 25 Patent claims 1. Electric motor stator core construction, characterized in that the said electric motor stator core construction comprises a stator yoke part and a stator tooth part, wherein the inner diameter side of the said stator yoke part is provided to fit the outer diameter side of the stator tooth part by means of a clamping connection, wherein the aforementioned stator tooth part is a ring shape formed by connecting the front and rear ends of a tooth part chain, wherein oriented silicon steel is used for the aforementioned tooth part chain, wherein the orientation direction of the aforementioned oriented silicon steel is the extension direction of the stator teeth in the tooth part chain, wherein the outer circumferential surface of the aforementioned stator tooth part has at least one process opening.

2. Electric motor stator core construction according to claim 1, characterized in that the tooth chain comprises at least two tooth elements, each of which comprises stator teeth. wherein the width of the said stator teeth in the circumferential direction at one end of the outer diameter side of the said stator tooth part is greater than or equal to the width in the circumferential direction at one end of the inner diameter side of the said stator tooth part.

3. Electric motor stator core construction according to claim 2, characterized in that the aforementioned stator teeth extend from one 18.02.2026 26 The end of the inner diameter side of the said stator tooth part extends first extension parts to both sides in the circumferential direction, with an intermediate gap being provided between two adjacent said first extension parts of the stator teeth.

4. Electric motor stator core construction according to claim 2 or 3, characterized in that the projection of said process opening in the direction of the central axis of said stator core on the end surface of said stator core has any of the following shapes: triangular, trapezoidal or rectangular.

5. Electric motor stator core construction according to claim 4, characterized in that the said tooth element also comprises a projection extending in the direction of the said stator yoke part.

6. Electric motor stator core construction according to claim 5, characterized in that the orientation direction of the oriented silicon steel of said projection part corresponds to the orientation direction of said stator tooth part.

7. Electric motor stator core construction according to claim 6, characterized in that the aforementioned projection part is a shape having side edges, wherein the side edge length of the projection part is L, where the minimum width of the aforementioned stator teeth is at the first extension part H, where L > H. 18.02.2026 27 8. Electric motor stator core construction according to claim 1, characterized in that the tooth segment chain is formed by connecting several tooth segment units arranged in the circumferential direction, wherein the number of the aforementioned tooth subdivision units is greater than or equal to twice the number of rotor pole pairs of the electric motor and less than the number of stator slots in the aforementioned electric motor stator core.

9. Electric motor stator core construction according to claim 8, characterized in that the two ends of said tooth segment unit are each provided with a clamping connector and a clamping connection groove matching said clamping connector.

10. Electric motor stator core construction according to claim 1, characterized in that the tooth element is a straight shape or a curved shape suitable for the stator yoke part.

11. Electric motor stator core construction according to claim 1, characterized in that if the said stator yoke part is a stator yoke part made of oriented silicon steel, the said stator yoke part is produced by spiral winding and stacking of an oriented yoke part steel strip, wherein the orientation direction of the oriented yoke part steel strip is its longitudinal direction.

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