Stator windings, stator assembly and motor

Abstract

This utility model discloses a stator winding, a stator assembly, and a motor, relating to the field of motor technology. The stator winding includes a circuit board, multiple phase windings, and multiple lead-out pads. The circuit board has multiple slots. The multiple phase windings are located on the circuit board and connected in a star configuration. The ends of the multiple phase windings are electrically connected to form the neutral point of the star configuration. Each phase winding includes multiple coils connected in series, and at least one coil is wound in each slot. Multiple lead-out pads are located on the circuit board, each pad corresponding to the starting end of a phase winding, and each pad is used for electrical connection to a motor controller. The technical solution provided by this utility model can solve the problems of complex processes, low efficiency, and easy coil damage leading to insulation failure in the production of axial flux motor sub-windings.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a stator winding, a stator assembly, and a motor. Background Technology

[0002] The current manufacturing process for stator windings of axial flux motors is quite complex, involving multiple steps such as coil winding, assembly, fixing, welding, attaching temperature sensing elements, wire arrangement, and testing. The entire process is cumbersome and inefficient. In particular, the coils are susceptible to abrasion at any stage, leading to impaired insulation performance and consequently affecting overall production efficiency and product yield. Utility Model Content

[0003] The main purpose of this invention is to propose a stator winding, stator assembly, and motor, which aims to solve the problems of complex manufacturing process, low efficiency, and easy damage to the coil leading to insulation failure in the production of axial flux motor sub-windings.

[0004] To achieve the above objectives, the stator winding proposed in this utility model includes: A circuit board having multiple grooves on it; Multiple phase windings are disposed on the circuit board. The multiple phase windings are connected in a star configuration. The ends of the multiple phase windings are electrically connected to each other to form the neutral point of the star configuration. Each phase winding includes multiple coils connected in series. At least one coil is wound in each slot. Multiple lead-out pads are provided on the circuit board, each lead-out pad is connected to the starting end of one of the phase windings, and each lead-out pad is used for electrical connection to the motor controller.

[0005] In one embodiment, the number of phase windings is three, the number of lead-out pads is three, each phase winding includes two sub-windings, one sub-winding of each of the three phase windings is electrically connected to the others, one sub-winding of each of the three phase windings is connected to one lead-out pad, and the two sub-windings of one phase winding are spaced apart from one sub-winding of the other two phase windings.

[0006] In one embodiment, the phase winding includes a first phase winding, a second phase winding, and a third phase winding. The first phase winding includes a first sub-winding and a second sub-winding connected in series. The second phase winding includes a third sub-winding and a fourth sub-winding connected in series. The third phase winding includes a fifth sub-winding and a sixth sub-winding connected in series. The lead-out pads include a first lead-out pad, a second lead-out pad, and a third lead-out pad. The first sub-winding, the third sub-winding, and the fifth sub-winding are electrically connected to each other. The second sub-winding is electrically connected to the first lead-out pad. The fourth sub-winding is electrically connected to the second lead-out pad. The sixth sub-winding is electrically connected to the third lead-out pad. The first sub-winding, the third sub-winding, the fifth sub-winding, the second sub-winding, the fourth sub-winding, and the sixth sub-winding are arranged end-to-end along the circumference of the circuit board to form a closed loop.

[0007] In one embodiment, the coil of each of the slots is formed by stacking multiple layers of copper wires disposed on the circuit board.

[0008] In one embodiment, the stator winding further includes: A temperature sensing element, mounted on the circuit board, is used to measure the temperature of the phase winding; A temperature sensing lead-out pad is provided on the circuit board. The temperature sensing lead-out pad is electrically connected to the temperature sensing element. The temperature sensing lead-out pad is used to connect to the motor controller and to transmit the temperature measured by the measuring element to the motor controller.

[0009] This utility model also proposes a stator assembly, including a stator core and a stator winding as described above, wherein the stator winding is connected to the stator core.

[0010] In one embodiment, the stator core includes a plurality of teeth, which are one-to-one inserted into a plurality of slots in the stator winding.

[0011] In one embodiment, a reinforcing agent is filled between each tooth and its corresponding groove.

[0012] In one embodiment, the stator core further includes a core base, and a plurality of the teeth are arranged at circumferential intervals on the core base.

[0013] This utility model also proposes an electric motor, including the stator assembly as described above.

[0014] This invention utilizes a circuit board as the basic carrier, with multiple slots on the board. Each slot contains at least one coil, and these coils are connected in series to form phase windings. These phase windings are connected in a star configuration, converging at their ends to form a neutral point, thus achieving unified and simplified electrical connections. Simultaneously, multiple lead-out pads are provided on the circuit board, each corresponding to the starting end of a phase winding. In practical applications, only the lead-out pads need to be electrically connected to the motor controller to complete the stator winding assembly. This is because the electrical connections between all phase windings are pre-laid out and integrated on the circuit board using printed circuitry, eliminating the need for complex external wiring and soldering operations. This integrated structure reduces the tedious processes of winding, assembly, soldering, and wire management in traditional stator winding manufacturing, lowering the risk of insulation failure due to coil abrasion during manual operation, thereby improving overall motor production efficiency and product qualification rate. Attached Figure Description

[0015] 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.

[0016] Figure 1 A schematic diagram of the structure of an embodiment of the stator winding provided by this utility model; Figure 2 A schematic diagram of the structure of an embodiment of the stator assembly provided by this utility model; Figure 3 for Figure 2 A schematic diagram of the structure of the middle stator core.

[0017] Explanation of icon numbers: 1000, Stator assembly; 100, Stator winding; 1, Circuit board; 101, Gear slot; 2, Phase winding; U, First phase winding; V, Second phase winding; W, Third phase winding; 21, Sub-winding; U1, First sub-winding; U2, Second sub-winding; V1, Third sub-winding; V2, Fourth sub-winding; W1, Fifth sub-winding; W2, Sixth sub-winding; 211, Coil; 3, Lead-out pad; 31, First lead-out pad; 32, Second lead-out pad; 33, Third lead-out pad; 4, Temperature sensing element; 5, Temperature sensing lead-out pad; 200, Stator core; 6, Gear section; 7, Core base.

[0018] 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

[0019] 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 scope of protection of the present utility model.

[0020] 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 specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0021] 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 use of "and / or" or "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.

[0022] The current manufacturing process for stator windings of axial flux motors is quite complex, involving multiple steps such as coil winding, assembly, fixing, welding, attaching temperature sensing elements, wire arrangement, and testing. The entire process is cumbersome and inefficient. In particular, the coils are susceptible to abrasion at any stage, leading to impaired insulation performance and consequently affecting overall production efficiency and product yield.

[0023] To solve the above problems, this utility model proposes a stator winding 100.

[0024] Please see Figure 1 In one embodiment of this utility model, the stator winding 100 includes: Circuit board 1, with multiple grooves 101 provided on circuit board 1; Multiple phase windings 2 are disposed on the circuit board 1. The multiple phase windings 2 are connected in a star configuration. The ends of the multiple phase windings 2 are electrically connected to each other to form the neutral point of the star configuration. Each phase winding 2 includes multiple coils 211 connected in series. At least one coil 211 is wound in each slot 101. Multiple lead-out pads 3 are provided on the circuit board 1. Each lead-out pad 3 is connected to the starting end of a phase winding 2. Each lead-out pad 3 is used for electrical connection to the motor controller.

[0025] In this embodiment, the circuit board 1 serves as the carrier of the stator winding 100, and is preferably made of a printed circuit board (PCB) or a composite substrate with excellent mechanical strength and insulation properties. The circuit board 1 has an overall ring structure and a plurality of grooves 101 are evenly arranged along the circumference.

[0026] The slot 101 can be designed as an open or through-hole structure. In this embodiment, a through-hole structure is preferred to facilitate the installation of the stator core 200. The slot 101 not only accommodates the coil 211 but also guides the magnetic flux path during motor operation, ensuring the continuity of the electromagnetic path. To improve current carrying capacity and winding density, each slot 101 in this embodiment is surrounded by coils 211 with a certain direction of rotation. These coils 211 are formed by stacking multiple layers of copper wire in the circuit board 1 and interconnected by copper wires laid in the circuit board 1 to form multiple phase windings 2. In other words, the stator winding 100 in this embodiment is manufactured in one piece using PCB technology, completing the electrical connection between the coil 22 and the circuit board 1 in one go. This eliminates the steps of winding the coil 211, soldering, attaching the temperature sensing element 4, and wire management, greatly improving work efficiency, optimizing space utilization, and helping to enhance heat dissipation performance and the stability of electrical connections.

[0027] Multiple coils 211 are connected in series to form a phase winding 2. Each phase winding 2 can have 4, 6, or even other numbers of coils 211. For ease of understanding, this embodiment uses an example with 18 slots 101, each slot having one coil 211 wound on its opening. Every 6 coils 211 are connected in series to form a phase winding 2, resulting in a total of three phase windings 2, which can be the U-phase winding 2, V-phase winding 2, and W-phase winding 2. This series connection ensures continuous current flow between the coils 211, improving electromagnetic efficiency. The three phase windings 2 are connected in a star configuration (Y-connection), where the copper wires at the ends of each phase winding 2 laid on the circuit board 1 are interconnected to form a common neutral point. This neutral point can be grounded or left floating, depending on the motor control strategy. The star connection simplifies the overall electrical connection structure, reduces losses caused by three-phase current imbalance, and improves the stability and efficiency of motor operation.

[0028] The circuit board 1 also has multiple lead-out pads 3, which are arranged along the edge of the circuit board 1 and spaced appropriately to avoid short-circuit risks. Each lead-out pad 3 corresponds to the starting end of a phase winding 2 for establishing an electrical connection with an external motor controller. Since the electrical connections between all phase windings 2 are pre-integrated on the circuit board 1 through printed circuits, in actual assembly, the stator winding 100 can be connected by simply plugging or crimping the lead-out pads 3 to the interface of the motor controller, eliminating the tedious processes of traditional manual soldering, wiring, and wire management. This structure can greatly reduce manual operations in the production process, lower the probability of problems such as coil 211 scratches and insulation damage caused by improper manual winding and soldering, and thus improve the yield and consistency of motor products. At the same time, due to the high integration of the stator winding 100, it is easy to inspect, maintain, and mass-produce, which is conducive to realizing automated manufacturing processes and improving the overall production efficiency and product qualification rate of motors.

[0029] The technical solution of this utility model highly integrates the electrical structure of the motor stator winding 100 onto the circuit board 1, thereby achieving modularization and standardization of the stator winding 100. This solution not only optimizes the layout of the stator winding 100 and improves electromagnetic performance, but also simplifies the production process, reduces the degree of manual intervention, and significantly improves the production efficiency and product consistency of motor products.

[0030] Please see Figure 1 In one embodiment, there are three phase windings 2 and three lead-out pads 3. Each phase winding 2 includes two sub-windings 21. The sub-windings 21 of the three phase windings 2 are electrically connected to each other. Each sub-winding 21 of the three phase windings 2 is connected to a lead-out pad 3. The two sub-windings 21 of one phase winding 2 are spaced apart from the sub-windings 21 of the other two phase windings 2.

[0031] In this embodiment, the stator winding 100 includes three phase windings 2 (e.g., U-phase, V-phase, and W-phase), each phase winding 2 consisting of two electrically connected sub-windings 21. The sub-windings 21 of each of the three phase windings 2 are electrically connected to each other, converging to form a common connection point, constituting a star connection (Y-type connection). The other sub-winding 21 of each of the three phase windings 2 is connected to a lead-out pad 3, for a total of three lead-out pads 3, used to establish an electrical connection with an external motor controller.

[0032] Specifically, three sets of phase windings 2 are provided on the circuit board 1, each set containing two sub-windings 21. One sub-winding 21 of each phase winding 2 (e.g., the end) is interconnected via printed copper wires on the circuit board 1, converging at a single point to form a star-connected neutral point. This neutral point can be grounded or left floating depending on the actual control strategy. This star connection not only simplifies the electrical connection of the stator winding 100 but also helps reduce energy loss caused by three-phase current imbalance, thereby improving the stability and efficiency of motor operation. Meanwhile, the other sub-winding 21 of each phase winding 2 (e.g., the starting end) is connected to the corresponding lead-out pad 3. Since only three lead-out pads 3 are configured, and each lead-out pad 3 corresponds to the starting terminal winding 21 of one phase winding 2, during assembly, simply plugging or crimping these three lead-out pads 3 to the interface of the motor controller completes the electrical connection of the entire stator winding 100. This design can effectively eliminate tedious processes such as traditional manual soldering, wiring, and cable management, significantly reducing manual operation steps and improving motor production efficiency and product consistency.

[0033] Specifically, the two sub-windings 21 of one phase winding 2 are not concentrated in the same area, but are spaced apart between the sub-windings 21 of the other two phase windings 2. For example: let the two sub-windings 21 of phase U be U1 and U2, phase V be V1 and V2, and phase W be W1 and W2. U1 is adjacent to V1, V1 is adjacent to W1, and W1 is adjacent to U2, meaning V1 and W1 are located between U1 and U2; simultaneously, U1 is also adjacent to W2, W2 is adjacent to V2, and V2 is adjacent to U2, meaning W2 and V2 are also located between U1 and U2. This staggered arrangement helps optimize the uniformity of the magnetic flux path distribution, reduces the occurrence of local magnetic saturation, improves the symmetry of the internal magnetic field of the motor, and thus enhances electromagnetic performance. Furthermore, this layout also facilitates uniform heat dissipation, enhances heat dissipation capacity, and improves the overall thermal stability and operational reliability of the motor.

[0034] Please see Figure 1In one embodiment, the phase winding 2 includes a first phase winding U, a second phase winding V, and a third phase winding W. The first phase winding U includes a first sub-winding U1 and a second sub-winding U2 connected in series. The second phase winding V includes a third sub-winding V1 and a fourth sub-winding V2 connected in series. The third phase winding W includes a fifth sub-winding W1 and a sixth sub-winding W2 connected in series. The lead-out pads 3 include a first lead-out pad 31, a second lead-out pad 32, and a third lead-out pad 33. Sub-winding U1, sub-winding V1, and sub-winding W1 are electrically connected to each other. Sub-winding U2 is electrically connected to first lead-out pad 31. Sub-winding V2 is electrically connected to second lead-out pad 32. Sub-winding W2 is electrically connected to third lead-out pad 33. Sub-winding U1, sub-winding V1, sub-winding W1, sub-winding U2, sub-winding V2, and sub-winding W2 are arranged end to end along the circumference of circuit board 1 to form a closed loop.

[0035] In this embodiment, the stator winding 100 includes three phase windings 2: a first phase winding U, a second phase winding V, and a third phase winding W. Each phase winding 2 is composed of two sub-windings 21 connected in series. The first phase winding U is the U-phase winding 2, which consists of a first sub-winding U1 and a second sub-winding U2 connected in series; the second phase winding V is the V-phase winding 2, which consists of a third sub-winding V1 and a fourth sub-winding V2 connected in series; the third phase winding W is the W-phase winding 2, which consists of a fifth sub-winding W1 and a sixth sub-winding W2 connected in series, thus forming a complete three-phase stator winding 100.

[0036] The circuit board 1 has multiple lead-out pads 3, specifically including a first lead-out pad 31, a second lead-out pad 32, and a third lead-out pad 33. These lead-out pads 3 are distributed along the edge of the circuit board 1 and maintained at appropriate intervals to prevent short circuits. The second sub-winding U2 is connected to the first lead-out pad 31, the fourth sub-winding V2 is connected to the second lead-out pad 32, and the sixth sub-winding W2 is connected to the third lead-out pad 33. These three lead-out pads 3 serve as the output terminals of each phase winding 2, used to establish an electrical connection with an external motor controller, thereby controlling the motor's operating status. Simultaneously, the first sub-winding U1, the third sub-winding V1, and the fifth sub-winding W1 are electrically connected to each other, converging at a single point to form the neutral point of a star connection (Y-type connection).

[0037] Furthermore, the first sub-winding U1, the third sub-winding V1, the fifth sub-winding W1, the second sub-winding U2, the fourth sub-winding V2, and the sixth sub-winding W2 are arranged sequentially along the circumference of circuit board 1, forming a closed-loop structure. Specifically, they are arranged in the order U1→V1→W1→U2→V2→W2 and electrically connected through printed copper wires on circuit board 1. This closed-loop circumferential arrangement not only maximizes the utilization of space but also makes the magnetic flux path more uniform and continuous, which helps to improve electromagnetic conversion efficiency, reduce magnetic field distortion, and improve the smoothness of motor operation. In addition, this closed-loop structure is also conducive to the uniform diffusion and distribution of heat, enhancing overall heat dissipation performance, thereby improving the thermal stability and long-term operational reliability of the motor.

[0038] Please see Figure 1 In one embodiment, the stator winding 100 further includes: Temperature sensing element 4 is mounted on circuit board 1 and is used to measure the temperature of phase winding 2; Temperature sensing lead-out pad 5 is located on circuit board 1. Temperature sensing lead-out pad 5 is electrically connected to temperature sensing element 4. Temperature sensing lead-out pad 5 is used to connect to motor controller and transmit the temperature measured by the measuring element to motor controller.

[0039] In this embodiment, the temperature sensing element 4 is disposed on the circuit board 1, specifically positioned near the phase winding 2, for real-time monitoring of the temperature change of the phase winding 2 during operation. The temperature sensing element 4 can be a thermistor (such as NTC or PTC), a temperature sensor chip, or other miniature temperature sensing devices suitable for the internal environment of the motor, featuring fast response, high measurement accuracy, and strong high-temperature resistance. The temperature sensing lead-out pad 5 is also disposed on the circuit board 1 and is electrically connected to the temperature sensing element 4 via copper wires laid out in the circuit board 1. This temperature sensing lead-out pad 5 serves as the output interface for the temperature signal, used to transmit the temperature signal collected by the temperature sensing element 4 to an external motor controller. In actual assembly, simply plugging or crimping the temperature sensing lead-out pad 5 to the corresponding interface on the motor controller achieves real-time temperature signal transmission. Through the above structural design, the motor can determine the working status of the stator winding 100 based on the temperature signal fed back by the temperature sensing element 4, and take timely protective measures such as current limiting, frequency reduction or power cut-off to prevent faults such as insulation damage and copper wire melting caused by overheating, thereby effectively improving the safety and reliability of motor operation.

[0040] Furthermore, since the temperature sensing element 4 and the temperature sensing lead-out pad 5 are both integrated on the circuit board 1, there is no need to install a separate temperature detection module or external sensor assembly. This not only simplifies the overall structure but also reduces manual wiring and installation procedures, improving assembly efficiency and product consistency. At the same time, this integrated design also helps to reduce the overall size of the motor, meeting the requirements for miniaturized motor design.

[0041] This utility model also proposes a stator assembly 1000, please refer to [link / reference needed]. Figure 2 and Figure 3 The stator assembly 1000 includes a stator core 200 and a stator winding 100. The specific structure of the stator winding 100 is as described in the above embodiments. Since this stator assembly 1000 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The stator winding 100 is connected to the stator core 200.

[0042] Please see Figure 2 and Figure 3 In one embodiment, the stator core 200 includes a plurality of teeth 6, which are disposed one-to-one in a plurality of slots 101 of the stator winding 100.

[0043] In this embodiment, the circuit board 1 has a plurality of slots 101 evenly arranged along the circumference. Each slot 101 is used to accommodate the coil 211 and participate in guiding the magnetic flux path. In order to realize the electromagnetic function of the motor, the plurality of teeth 6 of the stator core 200 are correspondingly connected to the plurality of slots 101 on the stator winding 100 to form a complete magnetic circuit structure.

[0044] Each tooth 6 can be made of a high-permeability material (such as silicon steel sheet, soft magnetic alloy, etc.), possessing excellent magnetic permeability and mechanical strength. The shape of the tooth 6 matches the tooth groove 101, and can be rectangular, trapezoidal, or other adaptable structures to ensure assembly accuracy and magnetic circuit continuity. Through a one-to-one through-fitting method, each tooth 6 forms a tight fit with the corresponding tooth groove 101, which not only improves magnetic flux conduction efficiency but also effectively reduces magnetic reluctance and local magnetic saturation, thereby improving the overall electromagnetic performance of the motor.

[0045] Furthermore, this one-to-one through-wire structure facilitates precise positioning and stable assembly between the stator core 200 and the stator winding 100, avoiding problems such as uneven magnetic field distribution or operational vibration caused by assembly deviations. Simultaneously, the modular design between the tooth 6 and the tooth slot 101 facilitates disassembly, replacement, and maintenance, improving the motor's maintainability and production consistency.

[0046] Please see Figure 2 and Figure 3 In one embodiment, a reinforcing agent is filled between each tooth 6 and the corresponding tooth groove 101.

[0047] In this embodiment, after the multiple teeth 6 of the stator core 200 are threaded one-to-one into the multiple slots 101 of the stator winding 100, a certain amount of reinforcing agent is injected or filled into the gap between the teeth 6 and the slots 101 to further improve assembly accuracy and mechanical reliability. This reinforcing agent can be epoxy resin, polyurethane adhesive, or other structural adhesive materials with excellent bonding properties, good insulation, and high-temperature resistance. After filling, the reinforcing agent can firmly bond the teeth 6 and the slots 101 during the curing process, forming an integrated structure, thereby effectively preventing the teeth 6 from loosening or shifting due to vibration, thermal expansion, or electromagnetic forces during motor operation.

[0048] By adding a reinforcing agent, not only can the mechanical connection strength between the stator core 200 and the stator winding 100 be improved, but the structural rigidity of the entire stator assembly 1000 is also enhanced. This helps reduce mechanical vibration and noise during operation, improving the smoothness of motor operation and its service life. Furthermore, due to the excellent insulating properties of the reinforcing agent, its filling between the tooth 6 and the tooth groove 101 also provides auxiliary insulation and moisture-proof sealing, further enhancing the motor's safety and environmental adaptability. Simultaneously, during the filling process, the reinforcing agent forms a good heat conduction path with the tooth 6 and the tooth groove 101, helping to more evenly conduct the heat generated by the stator winding 100 and the stator core 200 during operation to the outside, avoiding localized overheating and thus improving the overall thermal management performance of the motor.

[0049] Please see Figure 2 and Figure 3 In one embodiment, the stator core 200 further includes a core base 7, and a plurality of teeth 6 are arranged at intervals along the circumference of the core base 7.

[0050] In this embodiment, the stator core 200 further includes a core base 7. Multiple teeth 6 are arranged at intervals along the circumference of the core base 7, thus forming a complete stator core 200. The core base 7, as the basic support component of the stator core 200, can be made of a high-permeability material (such as silicon steel, soft magnetic composite material, etc.), has a ring structure, and matches the overall structure of the motor. Multiple teeth 6 extend outward from one side of the core base 7, are evenly distributed circumferentially, and are fixedly connected to the core base 7, forming a comb-like structure. Each tooth 6 is inserted into a slot 101 in the stator winding 100, thereby achieving magnetic circuit closure.

[0051] The core base 7 not only provides a unified mounting reference and mechanical support for each tooth 6, but also serves as an important component of the magnetic flux circuit, effectively conducting magnetic flux between the teeth 6, thereby improving the overall magnetic permeability of the stator core 200. By arranging multiple teeth 6 circumferentially along the core base 7, a more uniform magnetic field distribution is ensured during motor operation, reducing torque fluctuations and noise caused by uneven magnetic reluctance, and improving the smoothness and electromagnetic performance of the motor.

[0052] Furthermore, the presence of the core base 7 also helps to improve the overall mechanical strength and assembly stability of the stator core 200. On the one hand, it can enhance the bending resistance of the teeth 6 during operation, preventing deformation or breakage of the teeth 6 due to electromagnetic force or vibration; on the other hand, the core base 7 facilitates installation with the motor housing or other fixed structures, improving the assembly accuracy and consistency of the stator assembly 1000, and is conducive to realizing modular design and automated assembly.

[0053] This utility model also proposes an electric motor, which includes a stator assembly 1000. Please refer to [link / reference needed]. Figure 2 and Figure 3 The specific structure of the stator assembly 1000 is as described in the above embodiments. Since this motor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0054] The above are merely exemplary embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the technical concept of this utility model and the contents of the specification and drawings of this utility model, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A stator winding, characterized by, include: A circuit board having multiple grooves on it; Multiple phase windings are disposed on the circuit board. The multiple phase windings are connected in a star configuration. The ends of the multiple phase windings are electrically connected to each other to form the neutral point of the star configuration. Each phase winding includes multiple coils connected in series. At least one coil is wound in each slot. Multiple lead-out pads are provided on the circuit board, each lead-out pad is connected to the starting end of one phase winding, and each lead-out pad is used for electrical connection to the motor controller.

2. The stator winding of claim 1, wherein, The number of phase windings is three, the number of lead-out pads is three, each phase winding includes two sub-windings, one sub-winding of each of the three phase windings is electrically connected to the other, and one sub-winding of each of the three phase windings is connected to one lead-out pad. The two sub-windings of one phase winding are spaced apart from one sub-winding of the other two phase windings.

3. The stator winding of claim 2, wherein, The phase windings include a first phase winding, a second phase winding, and a third phase winding. The first phase winding includes a first sub-winding and a second sub-winding connected in series. The second phase winding includes a third sub-winding and a fourth sub-winding connected in series. The third phase winding includes a fifth sub-winding and a sixth sub-winding connected in series. The lead-out pads include a first lead-out pad, a second lead-out pad, and a third lead-out pad. The first sub-winding, the third sub-winding, and the fifth sub-winding are electrically connected to each other. The second sub-winding is electrically connected to the first lead-out pad. The fourth sub-winding is electrically connected to the second lead-out pad. The sixth sub-winding is electrically connected to the third lead-out pad. The first sub-winding, the third sub-winding, the fifth sub-winding, the second sub-winding, the fourth sub-winding, and the sixth sub-winding are arranged end-to-end along the circumference of the circuit board to form a closed loop.

4. The stator winding of claim 1, wherein, Each of the aforementioned slots is formed by stacking multiple layers of copper wires disposed on the circuit board.

5. The stator winding of any one of claims 1 to 4, wherein, The stator winding also includes: A temperature sensing element, mounted on the circuit board, is used to measure the temperature of the phase winding; A temperature sensing lead-out pad is provided on the circuit board. The temperature sensing lead-out pad is electrically connected to the temperature sensing element. The temperature sensing lead-out pad is used to connect to the motor controller and to transmit the temperature measured by the measuring element to the motor controller.

6. A stator assembly characterized by, It includes a stator core and a stator winding as described in any one of claims 1 to 4, wherein the stator winding is connected to the stator core.

7. The stator assembly of claim 6, wherein, The stator core includes multiple teeth, which are arranged one-to-one in the slots of the stator winding.

8. The stator assembly of claim 7, wherein, Each tooth and its corresponding groove are filled with a reinforcing agent.

9. The stator assembly of claim 7, wherein, The stator core also includes a core base, and a plurality of teeth are arranged at intervals along the circumference of the core base.

10. An electric machine characterized by Includes the stator assembly as described in any one of claims 6 to 9.

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