Double-layer stator module and double-layer stator permanent magnet motor

Abstract

This utility model discloses a double-layer stator module and a double-layer stator permanent magnet motor. The double-layer stator module includes two stator units and multiple elongated components. Each stator unit includes an injection-molded base plate, multiple iron core components, and multiple coil windings. Each iron core component is integrally connected to the injection-molded base plate through injection molding and is arranged sequentially at intervals along the circumference of the injection-molded base plate. The multiple coil windings are wound one-to-one around the periphery of each iron core component. Each iron core component abuts against each other along the axial direction to form multiple iron core groups arranged sequentially at intervals along the circumference. An assembly cavity is defined between each two adjacent iron core groups. Each elongated component is inserted into its respective assembly cavity. The elongated component has a drainage channel along its length for oil flow. This application utilizes oil for efficient cooling while simplifying the structure of the stator unit and elongated components, reducing molding difficulty, and minimizing impact on the normal operation of the entire machine, ultimately contributing to improved operational reliability.

Description

Technical Field

[0001] This utility model relates to the field of double-layer stator permanent magnet motor technology, specifically to a double-layer stator module and a double-layer stator permanent magnet motor. Background Technology

[0002] During normal operation, double-layer stator permanent magnet motors tend to dissipate a significant amount of heat in both the stator and rotor, making heat dissipation design at these locations crucial. Common heat dissipation designs for double-layer stator permanent magnet motors include direct liquid cooling (such as ethylene glycol aqueous solution) and oil cooling. Among these, oil cooling technology exhibits higher heat dissipation efficiency in the compact structure of double-layer stator permanent magnet motors compared to water cooling technology. This is due to several factors: oil has a higher thermal conductivity than water and can directly contact the winding ends; oil cooling is also better suited to the stability requirements of the coolant under centrifugal force at high speeds.

[0003] The core of a double-layer stator permanent magnet motor is divided into a solid core and a segmented core. For most double-layer stator permanent magnet motors with an intermediate single stator, the stator core is segmented, meaning that the core unit for each tooth is separate, and the entire stator core is composed of many separate, independent cores.

[0004] A yokeless stator core design has been developed, which eliminates the stator yoke found in traditional stator cores. As an alternative, the segmented yokeless core is typically injection molded with a composite matrix. However, applying this yokeless stator core to a double-layer stator permanent magnet motor presents challenges for oil cooling technology. For instance, the sandwich structure of a double-layer stator permanent magnet motor requires precise control of the axial air gap at the micrometer level, while the oil cooling system must maintain this precision while preventing oil leakage. Some solutions employ an integrated spindle oil circuit design, but machining the hollow shaft further increases process complexity. Furthermore, the flattened structure of the double-layer stator permanent magnet motor limits the heat dissipation area, necessitating a multi-channel design for uniform cooling, further increasing process complexity. Utility Model Content

[0005] The main purpose of this utility model is to propose a double-layer stator module and a double-layer stator permanent magnet motor, which aims to improve the oil cooling effect of the traditional double-layer stator permanent magnet motor while minimizing the overall process complexity.

[0006] To achieve the above objectives, this utility model proposes a double-layer stator module, comprising two stator units and multiple elongated components; the stator unit includes:

[0007] The injection-molded base plate is arranged in a ring shape.

[0008] Multiple iron core components, each of which is integrally connected to the injection molding base plate via injection molding, and arranged sequentially at intervals along the circumference of the injection molding base plate; and,

[0009] Multiple coil windings are wound one-to-one around the periphery of each of the aforementioned iron core components;

[0010] In this configuration, the core components of the two stator units are respectively abutted against each other along the axial direction to form a plurality of core groups arranged sequentially along the circumferential direction. An assembly cavity is defined between each pair of adjacent core groups. Each elongated component is inserted into the assembly cavity. The elongated component is provided with a drainage channel along its length direction for oil flow.

[0011] Optionally, each of the assembly cavities is fitted with at least one of the elongated members; or,

[0012] Each of the assembly cavities is fitted with an elongated member, and the elongated member is located in the axial central region of the corresponding assembly cavity.

[0013] Optionally, one of the circumferential sidewalls of the elongated member and at least one of the circumferential sidewalls of the core member in the core assembly is provided with an outwardly convex structure, and the other is provided with an inwardly concave structure, wherein the outwardly convex structure and the inwardly concave structure are connected in a concave-convex fit.

[0014] Optionally, the ends of each core member away from the corresponding injection molding base plate protrude outwards to both sides in the circumferential direction, so that the two core members of the same core group jointly define the outward protrusion structure;

[0015] The elongated component has a recessed inner structure on its circumferential sidewall. The inner structure is adapted to the outer convex structure to limit the elongated component to the axial central region of the corresponding assembly cavity.

[0016] Optionally, the double-layer stator module further includes an annular outer shell, which is disposed around the periphery of the stator unit, and the interior of the annular outer shell is provided with a first cavity along its circumference;

[0017] The radial outer end of each of the elongated members abuts against the outer ring body, thereby connecting the drainage channel and the first cavity.

[0018] Optionally, the first cavity is provided with a first insertion hole in the radial direction for each of the elongated members, and the radial outer end of each of the elongated members is inserted into the first insertion hole in the corresponding direction.

[0019] Optionally, the double-layer stator module further includes an inner ring housing, which is disposed inside the ring of the stator unit. The inner ring housing and the radial inner ends of each of the core components are spaced apart to form an oil passage cavity at the space.

[0020] The inner surface of the outer ring body is also provided with a second cavity along its circumference, and the second cavity has a connecting port that connects to the oil passage cavity;

[0021] The radial inner end of each of the elongated parts abuts against the inner shell of the ring, and the elongated parts are provided with connecting through holes along the axial direction, and each of the connecting through holes is connected to the oil passage cavity.

[0022] Optionally, the inner shell of the ring is provided with a second insertion hole in the radial direction for each of the elongated members;

[0023] The radial inner ends of each of the elongated pieces are inserted into each of the second insertion holes in a corresponding manner.

[0024] Optionally, slots are provided on the shaft end surface of the iron core and / or the outer surface of the elongated member;

[0025] The double-layer stator module also includes a magnetic conductor, which is inserted into the slot.

[0026] In addition, to achieve the above objectives, this utility model also provides a double-layer stator permanent magnet motor, including the double-layer stator module as described above.

[0027] In the technical solution provided by this utility model, the stator unit can achieve a yokeless design through the injection molding of the iron core and the injection molded base plate, which helps to reduce material consumption and optimize magnetic circuit efficiency, enhance torque density, and reduce copper loss and iron loss to a certain extent, thereby optimizing the overall electromagnetic performance.

[0028] The double-layer stator module is obtained by assembling two stator units, which helps to reduce the difficulty of stator unit preparation and coil winding, thereby optimizing the overall structure and performance of the double-layer stator module.

[0029] Furthermore, by inserting elongated members between two adjacent core assemblies, the assembly stability between the two stator units and between the elongated members and the stator units is strengthened through the interlocking of the elongated members and the two adjacent core assemblies. On the other hand, the flow channels provided by the elongated members allow oil to circulate, thereby carrying away the heat from the double-layer stator module.

[0030] This application utilizes oil for efficient cooling while simplifying the structure of the stator unit and elongated parts, making them easier to form, so as not to affect the normal operation of the whole machine too much, and ultimately helping to improve the operational reliability of the whole machine. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0032] Figure 1 A perspective view of an embodiment of the double-layer stator module (ring shell not shown) provided by this utility model;

[0033] Figure 2 for Figure 1 Exploded view of the main structure of the double-layer stator module;

[0034] Figure 3 for Figure 1 A cross-sectional view of the middle double-layer stator module along the axial direction;

[0035] Figure 4 for Figure 3 Enlarged structural diagram at point A;

[0036] Figure 5 for Figure 1 Side view of the double-layer stator module;

[0037] Figure 6 for Figure 5 Enlarged structural diagram at point B;

[0038] Figure 7 for Figure 1 A three-dimensional schematic diagram of the middle stator unit;

[0039] Figure 8 for Figure 7 A schematic diagram showing the main structural decomposition of the middle stator unit;

[0040] Figure 9 for Figure 8 A three-dimensional schematic diagram of the injection-molded base plate and the iron core component;

[0041] Figure 10 for Figure 8 A partial radial schematic diagram of the injection-molded base plate and the iron core component;

[0042] Figure 11 for Figure 1 A three-dimensional schematic diagram of a medium-length component;

[0043] Figure 12 for Figure 1 A radial plane diagram of a medium-length component.

[0044] Explanation of icon numbers:

[0045] 100 Stator unit; 110 Injection molded base plate; 120 Core component; 120a Core assembly; 121 Outward convex structure; 130 Coil winding; 140 Inner ring housing; 141 Second insertion hole; 150 Oil passage cavity; 160 Assembly cavity; 200 Long component; 210 Drainage channel; 220 Inward concave structure; 230 Connecting through hole.

[0046] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0047] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0048] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0049] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0050] Please see Figures 1 to 12 This utility model provides a double-layer stator module and an applicable double-layer stator permanent magnet motor.

[0051] It should be noted that double-layer stator modules and the double-layer stator permanent magnet motors that can be applied to them are generally configured to have uniform relative directions such as axial, circumferential, radial, and tangential. Among them, the axial direction generally refers to the extension direction of the spindle of the double-layer stator permanent magnet motor.

[0052] Double-layer stator permanent magnet motors generally also include a rotor assembly. Depending on the actual needs, a double-layer stator permanent magnet motor can be configured as a single-rotor, single-stator motor. In this case, the double-layer stator permanent magnet motor has a built-in double-layer stator module and a rotor assembly, which are arranged side by side along the axial direction.

[0053] Or such as Figures 1 to 6 As shown, a double-stator permanent magnet motor can be configured as a single-stator dual-rotor motor. In this case, the double-stator permanent magnet motor incorporates a double-stator module and two rotor units. The two rotor units are located on opposite sides of the double-stator module along the axial direction, and all three are arranged side-by-side along the axial direction.

[0054] In view of this, please combine Figures 1 to 12 The double-layer stator module provided by this utility model includes two stator units 100 and multiple elongated parts 200. Each stator unit 100 includes an injection-molded base plate 110, multiple iron core parts 120, and multiple coil windings 130.

[0055] The injection-molded base plate 110 is arranged in a ring shape. Each iron core component 120 is connected to the injection-molded base plate 110 as a whole by injection molding, and is arranged sequentially at intervals along the circumference of the injection-molded base plate 110. Multiple coil windings 130 are wound one-to-one around the periphery of each iron core component 120.

[0056] It is understood that the stator core in this application features a yokeless design. That is, the core component 120 of this application constitutes the stator teeth of a conventional stator core, but no additional stator yoke is designed. This simplifies the overall structure of the double-layer stator module and reduces the overall machining difficulty of the motor. Furthermore, it facilitates winding, saves core material, reduces motor weight, and increases torque density.

[0057] Each core component 120 is generally arranged in a fan shape or trapezoidal shape. The core components 120 are arranged sequentially at intervals around the circumference of the injection-molded base plate 110. The gaps between every two adjacent core components 120 form a slot structure. The material of a single core component 120 can be, but is not limited to, silicon steel sheet, soft magnetic powder SMC, or magnetically conductive solid iron.

[0058] The injection molded base plate 110 is disposed on the same side of the axial direction of each iron core component 120. Depending on the actual needs, the material of the injection molded base plate 110 may be, but is not limited to, high-performance engineering plastics such as PPS (polyphenylene sulfide), PPA (high-temperature nylon), and PBT (polybutylene terephthalate); thermosetting resin composites such as epoxy resin / unsaturated polyester resin; injection molded ferrite (PA + magnetic powder) or PEEK (polyether ether ketone), etc.

[0059] In this application, the injection molding base plate 110 can be injection molded. Generally, an insulating layer can first be provided on the outer side of each core component 120. For example, insulating paper can be wrapped around the outer side of each core component 120. Then, the injection molding operation is performed, so that each core component 120 is firmly connected to the injection molding base plate 110. At this time, an integral covering structure is formed on the outer periphery of each core component 120 with the injection molding base plate 110. Specifically, as shown... Figure 8 As shown, the covering structure is basically injection molded as one piece with the injection base plate 110. Moreover, the covering structure and the injection base plate 110 together cover almost the entire outer surface of the iron core 120.

[0060] Since the double-layer stator module includes two stator units 100, during assembly, the two stator units 100 need to be axially mated together. Specifically, the core components 120 of the two stator units 100 are respectively mated together axially. The two mating core components 120 of the two stator units 100 constitute a core group 120a. Therefore, for the double-layer stator module, multiple core groups 120a can be formed by circumferentially spaced intervals.

[0061] An assembly cavity 160 is defined between every two adjacent core groups 120a. This assembly cavity 160 corresponds to the space enclosed by the two slot structures as described above. However, it can be understood that since the coil windings 130 occupy a certain space of the corresponding slot structure when wound on the corresponding core member 120, the assembly cavity 160 is specifically the remaining space in the space enclosed by the two slot structures, excluding the space occupied by the two coil windings 130.

[0062] Each elongated component 200 is inserted into each assembly cavity 160. Each elongated component 200 has a drainage channel 210 extending along its length. The drainage channel 210 is used for the flow of oil.

[0063] In the technical solution provided by this utility model, the stator unit 100 can achieve a yokeless design through the injection molding of the iron core 120 and the injection molded base plate 110, which helps to reduce material consumption and optimize magnetic circuit efficiency, enhance torque density, and reduce copper loss and iron loss to a certain extent, thereby optimizing the overall electromagnetic performance.

[0064] The double-layer stator module is obtained by assembling two stator units 100, which helps to reduce the manufacturing difficulty of the stator unit 100 and the winding difficulty of the coil winding 130, thereby optimizing the overall structure and performance of the double-layer stator module.

[0065] Furthermore, by inserting an elongated member 200 between two adjacent core assemblies 120a, the assembly stability between the two stator units 100 and between the elongated member 200 and the stator unit 100 is strengthened through the mutual insertion of the elongated member 200 and the two adjacent core assemblies 120a. On the other hand, oil can circulate through the drainage channel 210 provided in the elongated member 200, thereby carrying away the heat of the double-layer stator module.

[0066] This application utilizes oil for efficient cooling while simplifying the structure of the stator unit 100 and the elongated part 200, making them easier to form, so as not to affect the normal operation of the whole machine too much, and ultimately helping to improve the operational reliability of the whole machine.

[0067] As described above, the drainage channel 210 penetrating within the elongated component 200 allows for oil flow. Furthermore, when assembled into the double-layer stator module, to achieve oil circulation, the double-layer stator module further includes an annular outer shell. The annular outer shell surrounds the stator unit 100 and is connected and fixed to at least the injection-molded base plate 110 within the stator unit 100. A first cavity is formed inside the annular outer shell. This first cavity can be formed around the circumference of the annular outer shell, generally forming a complete ring.

[0068] It should be noted that, since there are two stator units 100, in one specific embodiment, the outer ring housing can be set to a single housing. In this case, the two stator units 100 share the same outer ring housing. That is, the outer ring housing can be used to connect the peripheries of the two stator units 100 into a single unit.

[0069] Alternatively, in another specific embodiment, two annular outer shells can be configured. Each of the two annular outer shells corresponds one-to-one with one of the two stator units 100. Each annular outer shell surrounds the periphery of its corresponding stator unit 100. The two annular outer shells are axially joined together.

[0070] The radial outer ends of each elongated member 200 abut against the outer ring shell, thereby connecting the drainage channel 210 and the first cavity. In this way, the oil can flow in an orderly manner within the drainage channel 210 and the first cavity.

[0071] The elongated member 200 and the annular outer shell can directly abut against each other. Alternatively, in one specific embodiment, the radial inner wall of the annular outer shell has multiple first insertion holes corresponding to each elongated member 200. The first insertion holes communicate with the first cavity. The radial outer ends of each elongated member 200 are inserted into the corresponding first insertion holes. In this way, on the one hand, a stable connection between the elongated member 200 and the annular outer shell can be achieved through the first insertion holes. On the other hand, after being inserted into place, communication between the drainage channel 210 and the first cavity can be achieved.

[0072] In practical applications, the forming method of the first cavity is not limited. For example, when there are two annular shells, a first annular groove can be formed on the axial end face of at least one annular shell near the other annular shell. When the two annular shells are brought together, the first annular groove is closed to form the first cavity.

[0073] Similarly, when two annular housings are provided, a first notch can be provided in at least one annular housing near the axial end face of the other annular housing (the part near the stator unit 100). When the two annular housings are brought together, one or both first notches are joined to form a first insertion hole.

[0074] In addition, the double-layer stator module also includes an inner ring housing 140. The inner ring housing 140 is disposed within the ring of the stator unit 100. The inner ring housing 140 and the radially inner ends of each core member 120 are spaced apart to form an oil passage cavity 150 at the interval.

[0075] Similarly, since there are two stator units 100, in one specific embodiment, the inner housing 140 can be a single unit. In this case, the two stator units 100 share the same inner housing 140. That is, the outer peripheries of the two stator units 100 can be connected into a single unit using the inner housing 140.

[0076] Alternatively, in another specific embodiment, two inner ring housings 140 can be provided. The two inner ring housings 140 are provided one-to-one with the two stator units 100. Each inner ring housing 140 is respectively located inside the ring of the stator unit 100, and the two inner ring housings 140 are axially connected to each other.

[0077] At this point, a second cavity is formed inside the outer ring. This second cavity can also be arranged in a complete ring shape around the circumference of the outer ring. The second cavity has a connecting port that passes through the oil cavity 150.

[0078] Similarly, in specific applications, the molding method of the second cavity is not limited. For example, when there are two annular shells, a second annular groove can be formed on the axial end face of at least one annular shell away from the other annular shell. After the stator unit 100 and the annular shell are connected, the injection molded base plate 110 covers the second annular groove to form the second cavity.

[0079] Next, the radially inner end of each elongated member 200 abuts against the inner ring housing 140. The elongated member 200 also has a connecting through hole 230 along its axial direction. Each connecting through hole 230 communicates with the oil passage 150. In this way, a complete circulating oil path can be formed between the first cavity, the drainage channel 210, the connecting through hole 230, the oil passage 150, the connecting port, and the second cavity.

[0080] It should be noted that in practical applications, the first cavity can serve as the oil inlet cavity. Correspondingly, the second cavity serves as the oil outlet cavity. In this case, the first cavity is connected to external oil. Then, the external oil flows sequentially through each drainage channel 210 and each connecting through hole 230 before entering the oil passage cavity 150. Then, the oil in the oil passage cavity 150 enters the second cavity through each connecting port. Finally, the oil is discharged outward from the second cavity.

[0081] Conversely, in practical applications, the second cavity can serve as an oil inlet cavity. Correspondingly, the first cavity serves as an oil outlet cavity. In this case, the second cavity is connected to external oil. Then, the external oil flows sequentially through each connecting port into the oil passage cavity 150. Subsequently, the oil in the oil passage cavity 150 enters the first cavity through each connecting through hole 230 and each drainage channel 210. Finally, the oil is discharged outward from the first cavity.

[0082] In the above description, the oil passage 150 is located near the inner ring housing 140. Therefore, the connecting through hole 230 is also located near the inner ring housing 140.

[0083] Multiple connecting ports can be arranged at intervals along the circumference of the outer shell. Ideally, in the circumferential direction, the connecting ports should correspond to the slot structure between every two adjacent core members 120. In the axial direction, the connecting ports should be located as close as possible to the two injection-molded base plates 110 of the two stator units 100.

[0084] In this way, since the connecting through hole 230 and the connecting port are roughly located on the radial sides of the stator unit 100, the oil flowing between the connecting through hole 230 and the connecting port can basically flow radially through the entire stator unit 100, thereby achieving more comprehensive cooling of the stator unit 100.

[0085] Furthermore, the elongated member 200 and the inner ring housing 140 can directly abut against each other. Alternatively, in one specific embodiment, the radial outer wall of the inner ring housing 140 has a plurality of second insertion holes 141 corresponding to each elongated member 200 in the radial direction. The radial inner end of each elongated member 200 is inserted into each of the second insertion holes 141. In this way, a stable connection between the elongated member 200 and the inner ring housing 140 can be achieved by means of the second insertion holes 141.

[0086] Similarly, when two inner ring housings 140 are provided, a second notch can be provided in at least one inner ring housing 140 in a local part (near the stator unit 100) on the shaft end face of the other inner ring housing 140. When the two inner ring housings 140 are brought together, one or both second notches are joined to form a second insertion hole 141.

[0087] Based on one or more of the above embodiments, each assembly cavity 160 is then fitted with at least one elongated member 200. When at least two elongated members 200 are fitted into each assembly cavity 160, the elongated members 200 can be arranged sequentially along the axial direction to form at least two parallel drainage channels 210 within each assembly cavity 160, thereby helping to improve the cooling intensity of the core member 120 and the coil winding 130 on both sides of each assembly cavity 160.

[0088] When an elongated member 200 is inserted into each assembly cavity 160, the elongated member 200 can be positioned as close as possible to the axial center of the corresponding assembly cavity 160. This axial center region can be located at the mating line between the two stator units 100, or it can be located as close as possible to the mating line between the two stator units 100. In this way, the oil flowing within the same drainage channel 210 can be relatively evenly and separately cooled to the two stator units 100.

[0089] When the elongated member 200 is inserted into the assembly cavity 160, the circumferential sidewall of the elongated member 200 will be connected to the adjacent iron core member 120, so that each elongated member 200 and each iron core member 120 are connected into a whole.

[0090] The connection method between the elongated member 200 and the core member 120 is not limited; it can be, but is not limited to, abutting between flat surfaces, or a concave-convex limiting abutting connection. Taking the concave-convex limiting connection as an example, specifically, one of the circumferential sidewalls of the elongated member 200 and at least one circumferential sidewall of the adjacent core member 120 has an outwardly convex structure 121, and the other has an inwardly concave structure 220. The outwardly convex structure 121 and the inwardly concave structure 220 are connected by a concave-convex fitting.

[0091] It is understood that when the elongated member 200 is inserted into the assembly cavity 160, and the assembly cavity 160 is offset at a certain subunit 100, two iron core members 120 are respectively adjacent to its circumferential sides. Then, an outwardly convex structure 121 and an inwardly concave structure 220 can be respectively provided between the elongated member 200 and at least one iron core member 120. And preferably, an outwardly convex structure 121 and an inwardly concave structure 220 are respectively provided between the elongated member 200 and the two iron core members 120.

[0092] When both the elongated member 200 and the two core members 120 are provided with convex structures 121 and concave structures 220, specifically, convex structures 121 can be uniformly provided on both circumferential sides of the elongated member 200. Alternatively, concave structures 220 can be uniformly provided on both circumferential sides of the elongated member 200. Of course, convex structures 121 can also be provided on one circumferential side of the elongated member 200, and concave structures 220 can be provided on the other circumferential side. The two core members 120 are configured for compatibility.

[0093] Of course, when the elongated member 200 is inserted into the assembly cavity 160, and the assembly cavity 160 is located near the axial center region of the core assembly 120a, four core members 120 are respectively adjacent to the circumferential sides of the elongated member 200. Then, an outwardly convex structure 121 and an inwardly concave structure 220 can be respectively provided between the elongated member 200 and at least one core member 120. However, preferably, an outwardly convex structure 121 and an inwardly concave structure 220 are respectively provided between the elongated member 200 and the four core members 120.

[0094] Similarly, protruding structures 121 can be uniformly provided on both circumferential sides of the elongated member 200. Alternatively, concave structures 220 can be uniformly provided on both circumferential sides of the elongated member 200. Of course, a protruding structure 121 can also be provided on one circumferential side of the elongated member 200, and a concave structure 220 can be provided on the other circumferential side. The four core members 120 are configured for compatibility.

[0095] Specifically, such as Figures 10 to 12 As shown, the ends of each core member 120 away from its corresponding injection molding base plate 110 protrude circumferentially to both sides, so that after the two core members 120 of the same core group 120a are joined, they can be combined to define two outwardly convex structures 121. The outwardly convex structures 121 defined by two adjacent core groups 120a protrude in a direction that approaches each other (for ease of understanding, they are referred to as side convex structures below). Correspondingly, the circumferential side walls of the elongated member 200 are respectively provided with an inner concave structure 220, and the inner concave structure 220 and the outwardly convex structure 121 are connected in a one-to-one concave-convex fit to limit the elongated member 200 in the axially central region of the corresponding assembly cavity 160.

[0096] In this way, on the one hand, the structure of each core component 120 can be kept as uniform as possible, making it easier to manufacture and form. On the other hand, when a concave structure 220 is connected to a corresponding convex structure 121, it is equivalent to the concave structure 220 synchronously limiting the lateral convex structures of the two core components 120 of the same core group 120a, which to a certain extent helps to increase the mating strength between the two core components 120 of the same core group 120a. In addition, since the convex structure 121 is jointly defined by the lateral convex structures of the two core components 120 of the same core group 120a, when the concave structure 220 and the convex structure 121 are connected, the elongated component 200 can be limited as much as possible in the axial central region of the assembly cavity 160.

[0097] This application does not limit the form of the elongated component 200. Depending on actual needs, the elongated component 200 can be set to any suitable radial cross-sectional shape, size, and material. For example... Figures 11 to 12 As shown, the elongated component 200 is roughly in the shape of a quadrangular prism. The radial cross-sectional shape of the elongated component 200 is roughly quadrilateral.

[0098] Correspondingly, there are no restrictions on the radial cross-sectional shape and size of the drainage channel 210. For example... Figures 11 to 12 As shown, the radial cross-sectional shape of the drainage channel 210 can be approximately oval. Specifically, this oval shape can be a non-circular shape with all edges curved. Alternatively, the oval shape can also be an irregular shape with edges including both curved and straight lines. This oval shape allows for a larger radial cross-sectional area of ​​the drainage channel 210 within the limited space of the elongated member 200. This ensures that the drainage channel 210 can accommodate a larger flow rate of oil, thereby providing greater heat exchange and cooling capacity.

[0099] In a further embodiment, slots may be provided on the shaft end surface of the core component 120 and / or the outer surface of the elongated component 200, depending on actual needs. The double-layer stator module then includes a magnetic guide component. This magnetic guide component is inserted into the slot. After being assembled into the slot, the magnetic guide component helps to enhance the magnetic focusing effect of the double-layer stator module, thereby improving the overall operating performance of the machine.

[0100] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A double-layer stator module, characterized in that, It includes two stator units and multiple elongated components; the stator unit includes: The injection-molded base plate is arranged in a ring shape. Multiple iron core components, each of which is integrally connected to the injection molding base plate via injection molding, and arranged sequentially at intervals along the circumference of the injection molding base plate; and, Multiple coil windings are wound one-to-one around the periphery of each of the aforementioned iron core components; In this configuration, the core components of the two stator units are respectively abutted against each other along the axial direction to form a plurality of core groups arranged sequentially along the circumferential direction. An assembly cavity is defined between each pair of adjacent core groups. Each elongated component is inserted into the assembly cavity. The elongated component is provided with a drainage channel along its length direction for oil flow.

2. The double-layer stator module as described in claim 1, characterized in that, Each of the aforementioned assembly cavities is fitted with at least one of the aforementioned elongated members; or, Each of the assembly cavities is fitted with an elongated member, and the elongated member is located in the axial central region of the corresponding assembly cavity.

3. The double-layer stator module as described in claim 1, characterized in that, The circumferential sidewall of the elongated member and at least one of the circumferential sidewalls of the core member in the core assembly are provided with an outward convex structure and the other is provided with an inward concave structure, wherein the outward convex structure and the inward concave structure are adapted to each other.

4. The double-layer stator module as described in claim 3, characterized in that, Each of the core components has its end furthest from the corresponding injection molding base plate protruding outwards to both sides in the circumferential direction, so that the two core components of the same core group together define the outward protrusion structure. The elongated component has a recessed inner structure on its circumferential sidewall. The inner structure is adapted to the outer convex structure to limit the elongated component to the axial central region of the corresponding assembly cavity.

5. The double-layer stator module as described in claim 1, characterized in that, The double-layer stator module also includes an annular outer shell, which is arranged around the periphery of the stator unit, and the interior of the annular outer shell is provided with a first cavity along its circumference; The radial outer end of each of the elongated members abuts against the outer ring body, thereby connecting the drainage channel and the first cavity.

6. The double-layer stator module as described in claim 5, characterized in that, The first cavity has a first insertion hole in the radial direction corresponding to each of the elongated members, and the radial outer end of each of the elongated members is inserted into the first insertion hole.

7. The double-layer stator module as described in claim 5, characterized in that, The double-layer stator module also includes an inner ring housing, which is disposed inside the ring of the stator unit. The inner ring housing and the radial inner ends of each core component are spaced apart to form an oil passage cavity at the space. The inner surface of the outer ring body is also provided with a second cavity along its circumference, and the second cavity has a connecting port that connects to the oil passage cavity; The radial inner end of each of the elongated parts abuts against the inner shell of the ring, and the elongated parts are provided with connecting through holes along the axial direction, and each of the connecting through holes is connected to the oil passage cavity.

8. The double-layer stator module as described in claim 7, characterized in that, The inner shell of the ring has a second insertion hole in the radial direction corresponding to each of the elongated parts; The radial inner ends of each of the elongated pieces are inserted into each of the second insertion holes in a corresponding manner.

9. The double-layer stator module as described in claim 1, characterized in that, The shaft end surface of the iron core and / or the outer surface of the elongated member are provided with slots; The double-layer stator module also includes a magnetic conductor, which is inserted into the slot.

10. A double-layer stator permanent magnet motor, characterized in that, Includes the double-layer stator module as described in any one of claims 1 to 9.

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