12-slot 10-pole series servo motor stator PCB

Abstract

This utility model relates to the field of servo motor stator circuit board technology, specifically a 12-slot, 10-pole series servo motor stator PCB board. It includes a PCB board body, with one side designated as side A and the other as side B. Along the edge of the PCB board body, 12 solder slot units are arranged circumferentially to correspond to the 12 coil windings constituting the motor stator. Each solder slot unit includes two solder slots, resulting in a total of 24 solder slots on the PCB board body. Side A has U-pads, V-pads, W-pads, and A-side wiring, while side B has B-side wiring. A first via and a second via are provided on the PCB board body as channels for electrical connection between side A and side B, enabling cross-layer conduction between the A-side and B-side wiring. Through the cooperation of the A-side wiring, B-side wiring, the first via, and the second via, the coil windings corresponding to the 24 solder slots are connected in series according to the 10-pole magnetic field distribution requirement, forming a four-series circuit structure. This solution improves the production economy and applicability of servo motors by optimizing the number of circuit layers and insulation structure.

Description

Technical Field

[0001] This utility model relates to the field of servo motor stator circuit board technology, and in particular to a 12-slot 10-pole series servo motor stator PCB board. Background Technology

[0002] In the field of servo motor technology, with the continuous advancement of automated production, the application technology of PCB boards in servo motors has become mature. As a core drive component in industrial automation and other scenarios, servo motors with power ranges of 400W-3000W occupy a large proportion of the market. These motors generally adopt a 12-slot, 10-pole design.

[0003] In traditional technologies, PCBs adapted to 12-slot, 10-pole motors of this power range typically employ a four-layer circuit design. Implementing four layers of circuitry on a single PCB requires three layers of insulation, resulting in high manufacturing costs. Furthermore, with the market's increasing demand for cost reduction in servo motors, existing PCB solutions are struggling to meet competitive cost requirements and urgently need optimization and improvement.

[0004] On the other hand, servo motor production faces diverse application scenarios, requiring compatibility with both pin-type and pinless stators, as well as accommodating both automated and non-automated production processes. However, current PCB solutions for 12-slot 10-pole motors lack adaptability and process compatibility, failing to adequately cover diverse production application scenarios.

[0005] Therefore, in order to enhance product market competitiveness and meet the cost reduction and diversified application needs of the servo motor industry, there is an urgent need for a PCB board optimization solution for mainstream 12-slot 10-pole motors. By reasonably simplifying the number of circuit layers and reducing the number of insulation layers, the cost of components can be reduced while ensuring motor performance, and at the same time, it can be adapted to different motor stator types and manufacturing processes. Utility Model Content

[0006] The purpose of this utility model is to overcome the problems of the prior art and provide a 12-slot 10-pole series servo motor stator PCB board to solve the technical problems of the traditional four-layer circuit + three-layer insulation scheme, which has a large number of circuit layers and insulation layers, high material cost and difficult production process, and cannot be compatible with pin-type stator and pinless stator plug-in connection.

[0007] The above objectives are achieved through the following technical solutions:

[0008] A PCB board for a 12-slot, 10-pole series servo motor stator includes a PCB board body. One side of the PCB board body is designated as side A, and the other side as side B. Twelve solder slot units are circumferentially arranged along the edge of the PCB board body to correspond to the 12 coil windings constituting the motor stator. Each solder slot unit includes two solder slots, and the PCB board body has a total of 24 solder slots. Side A is provided with U-pads, V-pads, W-pads, and side A wiring. The side A wiring includes first, second, third, fourth, fifth, sixth, and seventh circuit wiring for side A circuit connections. The U-pad, V-pad, and W-pad are used for wiring with external three-phase lines UVW, respectively. The B-side is provided with B-side wiring, including a first, second, third, fourth, and fifth circuit wiring for B-side circuit connections. The PCB board has a first and a second via as channels for electrical connection between the A-side and the B-side, enabling cross-layer conduction between the A-side and B-side wiring. Through the cooperation of the A-side wiring, the B-side wiring, the first via, and the second via, the coil windings corresponding to the 24 solder slots are connected in series according to the 10-pole magnetic field distribution requirement, forming a four-series circuit structure.

[0009] Furthermore, the 12 weld pool units include: weld pool unit A, weld pool unit B, weld pool unit C, weld pool unit D, weld pool unit E, weld pool unit F, weld pool unit G, weld pool unit H, weld pool unit I, weld pool unit J, weld pool unit K and weld pool unit L.

[0010] Further, the W pad is connected to the solder pool unit B, the solder pool unit B is connected to the solder pool unit A through the first circuit wiring on the B side, the solder pool unit A is connected to the second circuit wiring on the B side through the first circuit wiring on the A side via the first via, the solder pool unit G is connected to the second circuit wiring on the B side, the solder pool unit G is connected to the solder pool unit H through the second circuit wiring on the A side; the solder pool unit H is connected to the solder pool unit L and the solder pool unit J through the third circuit wiring on the A side; the solder pool unit L is connected to the solder pool unit K through the fourth circuit wiring on the A side. The solder pad unit K is connected to the solder pad unit F through the third circuit wiring on the B side. The solder pad unit F is connected to the solder pad unit E through the fifth circuit wiring on the A side. The solder pad unit E is connected to the U pad. The solder pad unit J is connected to the solder pad unit I through the fourth circuit wiring on the B side. The solder pad unit I is connected to the sixth circuit wiring on the A side through the second via through the fifth circuit wiring on the B side. The sixth circuit wiring on the A side is connected to the solder pad unit C. The solder pad unit C is connected to the solder pad unit D through the seventh circuit wiring on the A side. The solder pad unit D is connected to the V pad.

[0011] Further, weld pool unit A includes a first weld pool and a second weld pool; weld pool unit B includes a third weld pool and a fourth weld pool; weld pool unit C includes a fifth weld pool and a sixth weld pool; weld pool unit D includes a seventh weld pool and an eighth weld pool; weld pool unit E includes a ninth weld pool and a tenth weld pool; weld pool unit F includes an eleventh weld pool and a twelfth weld pool; weld pool unit G includes a thirteenth weld pool and a fourteenth weld pool; weld pool unit H includes a fifteenth weld pool and a sixteenth weld pool; weld pool unit I includes a seventeenth weld pool and an eighteenth weld pool; weld pool unit J includes a nineteenth weld pool and a twentieth weld pool; weld pool unit K includes a twenty-first weld pool and a twenty-second weld pool; and weld pool unit L includes a twenty-third weld pool and a twenty-fourth weld pool.

[0012] Furthermore, the W pad is connected to the fourth solder pad, the third solder pad is connected to the first solder pad via the first circuit trace on side B, the second solder pad is connected to the second circuit trace on side B via the first circuit trace on side A and the first via, the fourteenth solder pad is connected to the second circuit trace on side B, the thirteenth solder pad is connected to the fifteenth solder pad via the second circuit trace on side A, the sixteenth solder pad is connected to the twenty-fourth solder pad and the nineteenth solder pad via the third circuit trace on side A; the twenty-third solder pad is connected to the twenty-first solder pad via the fourth circuit trace on side A. The 22nd solder pad is connected to the 11th solder pad via the third circuit wiring on side B, the 12th solder pad is connected to the 10th solder pad via the fifth circuit wiring on side A, and the 9th solder pad is connected to the U pad; the 20th solder pad is connected to the 18th solder pad via the fourth circuit wiring on side B, the 17th solder pad is connected to the sixth circuit wiring on side A via the second via the fifth circuit wiring on side B, the sixth circuit wiring on side A is connected to the 5th solder pad, the 6th solder pad is connected to the 8th solder pad via the 7th circuit wiring on side A, and the 7th solder pad is connected to the V pad.

[0013] Furthermore, the PCB board body uses FR-4 epoxy glass cloth laminate as the substrate material.

[0014] Furthermore, both the wiring on side A and the wiring on side B use electrolytic copper foil as the conductive material.

[0015] Furthermore, solder resist ink is coated on the surfaces of the wiring on side A and the wiring on side B.

[0016] Furthermore, the PCB board is provided with several positioning slots.

[0017] Furthermore, the PCB board is provided with several anti-foolproof grooves.

[0018] This utility model provides a 12-slot, 10-pole series servo motor stator PCB board. By optimizing the number of circuit layers and insulation structure, it reduces costs, adapts to pin-type and pinless stators, and supports both automated and non-automated processes, improving the economic efficiency and applicability of servo motor production and meeting market competition demands. Specifically, it includes:

[0019] 1. Significant cost reduction: The design adopts a two-layer ribbon cable + one-layer insulation design, which reduces the number of wiring layers and insulation layers compared to the traditional four-layer wiring + three-layer insulation solution. This reduces material costs and manufacturing process difficulty, effectively controls the cost of PCB board components, enhances product market competitiveness, and meets the cost reduction needs of the servo motor industry.

[0020] 2. Multi-scenario adaptation: The PCB board shape and solder groove layout are compatible with both pin-type and pinless stator insertion requirements; the circuit design and structural precision can meet the high-precision and high-efficiency assembly of automated production, and can also be adapted to non-automated manual assembly scenarios, improving the applicability of the product in different production environments.

[0021] 3. Motor performance assurance: Through optimized two-layer circuit layout, via cross-layer connection and four-string circuit logic, it adapts to the stator magnetic field distribution of a 12-slot 10-pole motor, ensuring the reliability of coil winding circuit connection. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the A-side structure of the stator PCB board of a 12-slot 10-pole series servo motor according to the present invention;

[0023] Figure 2 This is a schematic diagram of the B-side structure of a stator PCB board for a 12-slot, 10-pole series servo motor according to the present invention.

[0024] Figure 3 This is a circuit diagram of a stator PCB board for a 12-slot, 10-pole series servo motor as described in this utility model.

[0025] Illustration markings:

[0026] 1-First weld groove, 2-Second weld groove, 3-Third weld groove, 4-Fourth weld groove, 5-Fifth weld groove, 6-Sixth weld groove, 7-Seventh weld groove, 8-Eighth weld groove, 9-Ninth weld groove, 10-Tenth weld groove, 11-Eleventh weld groove, 12-Twelfth weld groove, 13-Thirteenth weld groove, 14-Fourteenth weld groove, 15-Fifteenth weld groove, 16-Sixteenth weld groove, 17-Seventeenth weld groove, 18-Eighteenth weld groove, 19-Nineteenth weld groove, 20-Twentieth weld groove, 21-Twenty-first weld groove, 22-Twenty-second weld groove, 23-Twenty-third weld groove. 24 - Twenty-fourth solder pad; 25 - PCB board body; 26 - Side A; 27 - Side B; 28 - First circuit routing on Side A; 29 - Second circuit routing on Side A; 30 - Third circuit routing on Side A; 31 - Fourth circuit routing on Side A; 32 - Fifth circuit routing on Side A; 33 - Sixth circuit routing on Side A; 34 - Seventh circuit routing on Side A; 35 - First circuit routing on Side B; 36 - Second circuit routing on Side B; 37 - Third circuit routing on Side B; 38 - Fourth circuit routing on Side B; 39 - Fifth circuit routing on Side B; 40 - First via; 41 - Second via. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. The described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0028] like Figure 1 and 2 As shown, this solution provides a 12-slot 10-pole series servo motor stator PCB board, including a PCB board body 25. One side of the PCB board body 25 is designated as surface A 26, and the other side is designated as surface B 27. Along the edge of the PCB board body 25, 12 solder slot units are arranged circumferentially to correspond to the 12 coil windings constituting the motor stator. Each solder slot unit includes 2 solder slots, and the PCB board body 25 is provided with a total of 24 solder slots.

[0029] The A-side 26 is provided with U-pads, V-pads, W-pads, and A-side wiring. The A-side wiring includes A-side first circuit wiring 28, A-side second circuit wiring 29, A-side third circuit wiring 30, A-side fourth circuit wiring 31, A-side fifth circuit wiring 32, A-side sixth circuit wiring 33, and A-side seventh circuit wiring 34, which are used for A-side circuit connections. The U-pads, V-pads, and W-pads are respectively used for connecting to external three-phase lines UVW.

[0030] The B-side 27 is provided with B-side wiring, including B-side first circuit wiring 35, B-side second circuit wiring 36, B-side third circuit wiring 37, B-side fourth circuit wiring 38 and B-side fifth circuit wiring 39, for B-side circuit connection;

[0031] The PCB board 25 has a first via 40 and a second via 41, which serve as channels for electrical connection between the A-side 26 and the B-side 27, enabling cross-layer conduction between the A-side wiring and the B-side wiring; the A-side wiring, through the first via 40 and the second via 41, works with the B-side wiring to construct a complete circuit path.

[0032] By cooperating with the wiring on side A, the wiring on side B, the first via 40 and the second via 41, the coil windings corresponding to the 24 solder slots are connected in series according to the 10-pole magnetic field distribution requirement to form a four-string circuit structure.

[0033] This solution presents a 12-slot, 10-pole series-connected servo motor stator PCB board employing a pure series topology, with 12 windings connected in series to form a single loop. Full series connection of the windings is achieved through A / B surface routing and vias across layers. Current flows sequentially through the windings, emphasizing magnetic field period matching, making it suitable for scenarios requiring strict control of the magnetic field phase. Advantages include:

[0034] 1. More direct cost control: The simplified design of two-layer cabling + one-layer insulation results in lower material and process costs compared to the traditional four-layer board, making it suitable for cost-sensitive general-purpose servo motors;

[0035] 2. Wider structural compatibility: The basic series logic is compatible with various stator types (pin-insertion / pinless) and processes (automated / manual), with low risk of technological iteration.

[0036] In this embodiment, the 12 weld pool units include: weld pool unit A, weld pool unit B, weld pool unit C, weld pool unit D, weld pool unit E, weld pool unit F, weld pool unit G, weld pool unit H, weld pool unit I, weld pool unit J, weld pool unit K, and weld pool unit L. The circuit connection method is as follows:

[0037] The W pad is connected to the solder pool unit B. The solder pool unit B is connected to the solder pool unit A through the first circuit wiring 35 on the B side. The solder pool unit A is connected to the second circuit wiring 36 on the B side through the first circuit wiring 28 on the A side and the first via 40. The solder pool unit G is connected to the second circuit wiring 36 on the B side. The solder pool unit G is connected to the solder pool unit H through the second circuit wiring 29 on the A side. The solder pool unit H is connected to the solder pool unit L and the solder pool unit J through the third circuit wiring 30 on the A side.

[0038] The solder pool unit L is connected to the solder pool unit K through the fourth circuit wiring 31 on the A side, the solder pool unit K is connected to the solder pool unit F through the third circuit wiring 37 on the B side, the solder pool unit F is connected to the solder pool unit E through the fifth circuit wiring 32 on the A side, and the solder pool unit E is connected to the U pad.

[0039] The solder pad unit J is connected to the solder pad unit I through the fourth circuit wiring 38 on the B side. The solder pad unit I is connected to the sixth circuit wiring 33 on the A side through the second via 41 via the fifth circuit wiring 39 on the B side. The sixth circuit wiring 33 on the A side is connected to the solder pad unit C. The solder pad unit C is connected to the solder pad unit D through the seventh circuit wiring 34 on the A side. The solder pad unit D is connected to the V pad.

[0040] Specifically, in this embodiment, weld pool unit A includes a first weld pool 1 and a second weld pool 2; weld pool unit B includes a third weld pool 3 and a fourth weld pool 4; weld pool unit C includes a fifth weld pool 5 and a sixth weld pool 6; weld pool unit D includes a seventh weld pool 7 and an eighth weld pool 8; weld pool unit E includes a ninth weld pool 9 and a tenth weld pool 10; weld pool unit F includes an eleventh weld pool 11 and a twelfth weld pool 12; weld pool unit G includes a thirteenth weld pool 13 and a fourteenth weld pool 14; weld pool unit H includes a fifteenth weld pool 15 and a sixteenth weld pool 16; weld pool unit I includes a seventeenth weld pool 17 and an eighteenth weld pool 18; weld pool unit J includes a nineteenth weld pool 19 and a twentieth weld pool 20; weld pool unit K includes a twenty-first weld pool 21 and a twenty-second weld pool 22; and weld pool unit L includes a twenty-third weld pool 23 and a twenty-fourth weld pool 24.

[0041] As a specific embodiment of this solution, the first solder groove 1, the second solder groove 2, the third solder groove 3, the fourth solder groove 4, the fifth solder groove 5, the sixth solder groove 6, the seventh solder groove 7, the eighth solder groove 8, the ninth solder groove 9, the tenth solder groove 10, the eleventh solder groove 11, the twelfth solder groove 12, the thirteenth solder groove 13, the fourteenth solder groove 14, the fifteenth solder groove 15, the sixteenth solder groove 16, the seventeenth solder groove 17, the eighteenth solder groove 18, the nineteenth solder groove 19, the twentieth solder groove 20, the twenty-first solder groove 21, the twenty-second solder groove 22, the twenty-third solder groove 23, and the twenty-fourth solder groove 24 are key connection components between the PCB board 25 and the motor stator coil winding pins. Their specifications directly affect the electrical connection stability and assembly compatibility. The following detailed description is provided in terms of size, shape, material, surface treatment, etc., but this solution includes, but is not limited to, the following structural description:

[0042] Size Specifications: Inner Diameter: The inner diameter of the solder groove is customized according to the diameter of the matching coil winding pin. The standard specification is 0.8mm-1.2mm, and the tolerance is controlled within ±0.05mm to ensure an interference fit with the pin, achieve a stable connection, and reduce contact resistance and the risk of loosening. For stator welding without pins, the inner diameter can be appropriately enlarged to 1.5mm-2.0mm to reserve sufficient space for solder filling.

[0043] Depth dimension: The solder groove depth is uniformly set to 2.5mm-3.5mm to ensure sufficient contact area after the pin is inserted, while avoiding excessive depth that may cause insertion difficulties or damage to internal circuits, and to adapt to the insertion stroke parameters of automated insertion equipment.

[0044] Overall shape and specifications: It adopts a U-shaped through-hole design, and the verticality of the hole wall is controlled within ±0.5° to ensure that the pin is inserted vertically and avoid poor contact caused by tilting; the edge of the hole is chamfered at 0.2mm×45° to facilitate the insertion of the pin and reduce the pin jamming phenomenon during automated assembly.

[0045] Inner wall structure: The inner wall roughness Ra≤1.6μm of the solder pool provides a smooth surface, reduces the insertion resistance of the pin, and reduces the residual accumulation of solder on the hole wall, thereby improving the welding quality and consistency.

[0046] Material Specifications: The copper foil in the solder bath area uses the same high-purity electrolytic copper foil as the wiring on sides A and B, with a purity of ≥99.9% and a uniform thickness of 35μm, to ensure consistent conductivity with the circuit and reduce the resistance difference between the solder joint and the circuit.

[0047] Reinforced structure: The copper foil thickness is increased to 70μm at the bottom and surrounding areas of the solder bath through a local thickening process, which enhances the mechanical strength and current carrying capacity of the solder bath and adapts to the large current impact during motor startup and operation.

[0048] Surface treatment specifications: The inner wall and surface of the solder bath are coated with electroless nickel-gold plating. The nickel layer thickness is 2.5μm-3.5μm, providing good anti-oxidation and wear resistance. The gold layer thickness is 0.05μm-0.1μm, which improves the solderability of the solder bath and ensures that a strong intermetallic compound layer is formed with the pins or solder.

[0049] Solder resist layer: The perimeter of the solder bath is covered with high-temperature resistant solder resist ink, with a 0.15mm-0.25mm window area reserved at the edge of the solder bath. This prevents solder from sticking to non-soldering areas and ensures that the soldering area of ​​the solder bath is fully exposed, making it suitable for automated soldering processes such as wave soldering and reflow soldering.

[0050] Layout specifications and spacing parameters: The center distance between adjacent solder slots is set to 2.54mm, which is compatible with the general electronic component insertion standard and facilitates the programming and debugging of automated assembly equipment; at the same time, it meets the electrical safety requirement of creepage distance ≥0.5mm to avoid electrical short circuits between adjacent solder slots.

[0051] Circular distribution: 24 solder slots are evenly distributed in a circular array along the outer edge of the PCB board, with the angle error controlled within ±0.2°, to ensure precise alignment with the stator coil winding pins of the motor, thus guaranteeing the efficiency and accuracy of automated assembly.

[0052] like Figure 3 As shown, the above 24 solder slots correspond to the following four-series circuit connection examples in this solution:

[0053] The W pad is connected to the fourth solder groove 4. The third solder groove 3 is connected to the first solder groove 1 through the first circuit wiring 35 on the B side. The second solder groove 2 is connected to the second circuit wiring 36 on the B side through the first circuit wiring 28 on the A side and the first via 40. The fourteenth solder groove 14 is connected to the second circuit wiring 36 on the B side. The thirteenth solder groove 13 is connected to the fifteenth solder groove 15 through the second circuit wiring 29 on the A side. The sixteenth solder groove 16 is connected to the twenty-fourth solder groove 24 and the nineteenth solder groove 19 through the third circuit wiring 30 on the A side.

[0054] The 23rd solder pad 12 is connected to the 21st solder pad 21 through the fourth circuit wiring 31 on the A side, the 22nd solder pad 22 is connected to the 11th solder pad 11 through the third circuit wiring 37 on the B side, the 12th solder pad 12 is connected to the 10th solder pad 10 through the fifth circuit wiring 32 on the A side, and the 9th solder pad 9 is connected to the U-pad.

[0055] The twentieth solder pad 20 is connected to the eighteenth solder pad 18 through the fourth circuit wiring 38 on the B side. The seventeenth solder pad 17 is connected to the sixth circuit wiring 33 on the A side through the fifth circuit wiring 39 on the B side and the second via 41. The sixth circuit wiring 33 on the A side is connected to the fifth solder pad 5. The sixth solder pad 6 is connected to the eighth solder pad 8 through the seventh circuit wiring 34 on the A side. The seventh solder pad 7 is connected to the V pad.

[0056] The PCB board 25 uses FR-4 epoxy glass cloth laminate as the substrate material. Specifically:

[0057] Excellent electrical insulation performance: FR-4 material has high insulation resistance and dielectric strength, which can effectively prevent leakage between the lines on side A and side B, and between the lines and the external environment, ensuring the stable operation of the 12-slot 10-pole four-series circuit and meeting the strict requirements of servo motors for electrical insulation.

[0058] Excellent mechanical properties: It has good bending strength and rigidity. Under the mechanical stress of insertion with motor stator and automated assembly process, it is not easy to deform or break, ensuring the PCB board shape accuracy and structural stability, and adapting to different installation requirements of pin-type stator and pinless stator.

[0059] Balance between heat resistance and processability: It can withstand high-temperature processes in PCB manufacturing, such as lamination and soldering; at the same time, its moderate hardness makes it easy to use conventional processing techniques such as mechanical drilling (such as making the first and second vias) and etching (making circuit wiring), reducing production difficulty and cost, which fits the cost reduction design concept of this solution with two layers of ribbon cable and one layer of insulation.

[0060] High cost-effectiveness: FR-4 is a widely used and mature PCB substrate material in the market. It is relatively inexpensive and has a stable supply, which helps to control the overall manufacturing cost of PCB boards and meet the cost reduction needs of the servo motor industry.

[0061] In this embodiment, both the A-side wiring and the B-side wiring use electrolytic copper foil as the conductive material. The specific characteristics and advantages are as follows:

[0062] High conductivity: Copper foil has excellent conductivity and low resistance, which can effectively reduce the line loss of the 12-slot 10-pole four-series circuit, reduce energy loss during current transmission, and ensure the operating efficiency of the servo motor. Taking the wiring 28 to 34 of the first circuit on side A and the wiring 35 to 39 of the fifth circuit on side B as examples, the copper foil wiring ensures that the current flows quickly and stably through each solder slot and coil winding, realizing the efficient series connection of the four-series circuit.

[0063] Excellent adhesion: Through surface treatment processes (such as roughening), the copper foil can be tightly bonded to the FR-4 substrate, making it less prone to circuit detachment and delamination during PCB manufacturing and motor operation, thus improving the reliability of circuit connections and adapting to the complex working environment of servo motors.

[0064] High machinability: The electrolytic copper foil has a uniform thickness and is easy to process using etching technology to precisely produce circuit wiring with a width of 0.3mm and a spacing of 0.2mm, which meets the requirements of this solution for fine layout of the two-layer cabling and realizes the coordinated cooperation between the A-side wiring and the B-side wiring and the cross-layer connection of vias.

[0065] Antioxidant and solderability: The surface of copper foil can be protected by electroplating (such as tin plating or nickel-gold plating) to enhance its antioxidant ability and improve its solderability with solder pools and UVW pads, ensuring reliable connection between coil winding pins, three-phase lines and PCB board, and reducing the risk of poor contact.

[0066] To further improve the reliability and service life of the wiring, solder resist ink, such as acrylic resin solder resist ink, is coated on the surfaces of the wiring on side A and side B. This material has functions such as insulation, anti-oxidation, and anti-solder bridging, protecting the wiring on side A and side B from environmental corrosion, while standardizing the soldering area, improving the accuracy and efficiency of automated soldering processes, and adapting to the design goal of this solution that takes into account both automated and non-automated processes.

[0067] As a further optimization of this solution, the PCB board 25 is provided with several positioning slots and / or several anti-fooling slots.

[0068] Specifically, adding positioning slots and error-proofing slots to the 25mm edge of the PCB board can significantly improve assembly efficiency and accuracy, and reduce the risk of human error. Combining mechanical positioning principles and error-proofing design specifications, the following describes and defines its innovations from structural, functional, and process perspectives:

[0069] I. Positioning groove structure and limitations

[0070] Structural Design: The positioning slot adopts a dovetail groove structure with a trapezoidal cross-section, wider at the top and narrower at the bottom. The upper opening width is set at 3.0mm ± 0.05mm, the bottom width at 2.5mm ± 0.05mm, and the groove depth at 2.0mm ± 0.1mm. This structure forms a tight fit with the dovetail positioning pins on the motor stator housing or assembly fixture. Utilizing the self-locking effect of the trapezoidal inclined surface, precise positioning of the PCB board in the X and Y directions is achieved, with a positioning accuracy of ±0.03mm.

[0071] Layout and Quantity: Four positioning slots are diagonally distributed along the edge of the PCB board, with the spacing between each slot precisely matching the positioning holes on the motor stator housing. This diagonal layout effectively counteracts torque stress during assembly, preventing PCB board misalignment or warping, and is particularly suitable for the high-speed positioning requirements of robotic arms in automated press-fitting processes.

[0072] Materials and Processes: The positioning groove is directly processed onto the FR-4 PCB substrate using a stamping process, avoiding the addition of extra materials and reducing costs. The groove wall surface is sandblasted to a roughness Ra≤3.2μm, increasing the friction with the positioning pin and preventing loosening after assembly.

[0073] II. Anti-misbehavior groove structure and limitations

[0074] Asymmetrical foolproof design: The foolproof groove adopts an L-shaped asymmetrical structure, with a long side length of 8.0mm ± 0.1mm, a short side length of 5.0mm ± 0.1mm, and a groove depth of 1.5mm ± 0.05mm. This shape can only match the foolproof bumps on the motor stator housing in a specific direction. If the PCB board is installed in the wrong direction, it cannot be inserted, thus eliminating the risk of reverse installation from a structural perspective.

[0075] Functional Integration Design: The anti-misalignment groove and positioning groove are designed as a single, coplanar unit. Two anti-misalignment grooves and two positioning grooves are integrated on the same edge of the PCB board, forming a "positioning + anti-misalignment" composite functional area. The inner wall of the anti-misalignment groove is provided with an inclined guide surface (tilt angle 15°±2°), which facilitates quick identification of the correct direction during manual assembly and assists the vision positioning system of the automated assembly robot arm in quickly capturing features.

[0076] Error tolerance and compatibility: The design of the error-proof slot allows for a shape tolerance of ±0.2mm, ensuring the reliability of the error-proof function while being compatible with manufacturing errors of different batches of motor stator housings. The edges of the slot are rounded (R=0.3mm) to prevent stress concentration from causing the substrate to crack and to improve structural durability.

[0077] The above description is only for illustrating the embodiments of this utility model and is not intended to limit this utility model. For those skilled in the art, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A stator PCB board for a 12-slot, 10-pole series servo motor, comprising a PCB board body (25), wherein one side of the PCB board body (25) is designated as surface A (26) and the other side as surface B (27), characterized in that, Along the edge of the PCB board (25), 12 solder groove units are arranged circumferentially to correspond to the 12 coil windings that constitute the motor stator. Each solder groove unit includes 2 solder grooves, and the PCB board (25) has a total of 24 solder grooves. The A-side (26) is provided with U pads, V pads, W pads and A-side wiring. The A-side wiring includes A-side first circuit wiring (28), A-side second circuit wiring (29), A-side third circuit wiring (30), A-side fourth circuit wiring (31), A-side fifth circuit wiring (32), A-side sixth circuit wiring (33) and A-side seventh circuit wiring (34), which are used for A-side circuit connection. The U pads, V pads and W pads are respectively used to connect with external three-phase lines UVW. The B-side (27) is provided with B-side wiring, including B-side first circuit wiring (35), B-side second circuit wiring (36), B-side third circuit wiring (37), B-side fourth circuit wiring (38) and B-side fifth circuit wiring (39), for B-side circuit connection; The PCB board (25) has a first via (40) and a second via (41) as a channel for electrical connection between the A side (26) and the B side (27), thereby realizing cross-layer conduction between the wiring on the A side and the wiring on the B side; By cooperating with the wiring on side A, the wiring on side B, the first via (40) and the second via (41), the coil windings corresponding to the 24 solder slots are connected in series according to the 10-pole magnetic field distribution requirement to form a four-string circuit structure.

2. The stator PCB board for a 12-slot, 10-pole series servo motor according to claim 1, characterized in that, The 12 weld pool units include: weld pool unit A, weld pool unit B, weld pool unit C, weld pool unit D, weld pool unit E, weld pool unit F, weld pool unit G, weld pool unit H, weld pool unit I, weld pool unit J, weld pool unit K and weld pool unit L.

3. The stator PCB board for a 12-slot, 10-pole series servo motor according to claim 2, characterized in that, The W pad is connected to the solder pool unit B. The solder pool unit B is connected to the solder pool unit A through the first circuit wiring (35) on the B side. The solder pool unit A is connected to the second circuit wiring (36) on the B side through the first circuit wiring (28) on the A side and the first via (40). The solder pool unit G is connected to the second circuit wiring (36) on the B side. The solder pool unit G is connected to the solder pool unit H through the second circuit wiring (29) on the A side. The solder pool unit H is connected to the solder pool unit L and the solder pool unit J through the third circuit wiring (30) on the A side. The soldering unit L is connected to the soldering unit K through the fourth circuit wiring (31) on the A side, the soldering unit K is connected to the soldering unit F through the third circuit wiring (37) on the B side, the soldering unit F is connected to the soldering unit E through the fifth circuit wiring (32) on the A side, and the soldering unit E is connected to the U pad. The solder pad unit J is connected to the solder pad unit I through the fourth circuit wiring (38) on the B side. The solder pad unit I is connected to the sixth circuit wiring (33) on the A side through the second via (41) via the fifth circuit wiring (39) on the B side. The sixth circuit wiring (33) on the A side is connected to the solder pad unit C. The solder pad unit C is connected to the solder pad unit D through the seventh circuit wiring (34) on the A side. The solder pad unit D is connected to the V pad.

4. The stator PCB board for a 12-slot, 10-pole series servo motor according to claim 3, characterized in that, The weld pool unit A includes a first weld pool (1) and a second weld pool (2); the weld pool unit B includes a third weld pool (3) and a fourth weld pool (4); the weld pool unit C includes a fifth weld pool (5) and a sixth weld pool (6); the weld pool unit D includes a seventh weld pool (7) and an eighth weld pool (8); the weld pool unit E includes a ninth weld pool (9) and a tenth weld pool (10); the weld pool unit F includes an eleventh weld pool (11) and a twelfth weld pool (12); and the weld pool unit G includes a tenth weld pool (10). The three weld pools (13) and the fourteenth weld pool (14), the weld pool unit H includes the fifteenth weld pool (15) and the sixteenth weld pool (16), the weld pool unit I includes the seventeenth weld pool (17) and the eighteenth weld pool (18), the weld pool unit J includes the nineteenth weld pool (19) and the twentieth weld pool (20), the weld pool unit K includes the twenty-first weld pool (21) and the twenty-second weld pool (22), and the weld pool unit L includes the twenty-third weld pool (23) and the twenty-fourth weld pool (24).

5. A stator PCB board for a 12-slot, 10-pole series servo motor according to claim 4, characterized in that, The W pad is connected to the fourth solder groove (4), the third solder groove (3) is connected to the first solder groove (1) through the first circuit wiring (35) on the B side, the second solder groove (2) is connected to the second circuit wiring (36) on the B side through the first circuit wiring (28) on the A side via the first via (40), the fourteenth solder groove (14) is connected on the second circuit wiring (36) on the B side, the thirteenth solder groove (13) is connected to the fifteenth solder groove (15) through the second circuit wiring (29) on the A side, and the sixteenth solder groove (16) is connected to the twenty-fourth solder groove (24) and the nineteenth solder groove (19) through the third circuit wiring (30) on the A side; The 23rd solder pad (23) is connected to the 21st solder pad (21) through the fourth circuit wiring (31) on the A side, the 22nd solder pad (22) is connected to the 11th solder pad (11) through the third circuit wiring (37) on the B side, the 12th solder pad (12) is connected to the 10th solder pad (10) through the fifth circuit wiring (32) on the A side, and the 9th solder pad (9) is connected to the U-pad; The twentieth solder pad (20) is connected to the eighteenth solder pad (18) through the fourth circuit wiring (38) on the B side. The seventeenth solder pad (17) is connected to the sixth circuit wiring (33) on the A side through the fifth circuit wiring (39) on the B side and the second via (41). The sixth circuit wiring (33) on the A side is connected to the fifth solder pad (5). The sixth solder pad (6) is connected to the eighth solder pad (8) through the seventh circuit wiring (34) on the A side. The seventh solder pad (7) is connected to the V pad.

6. The stator PCB board for a 12-slot, 10-pole series servo motor according to claim 1, characterized in that, The PCB board (25) uses FR-4 epoxy glass cloth laminate as the substrate material.

7. A stator PCB board for a 12-slot, 10-pole series servo motor according to claim 1, characterized in that, Both the wiring on side A and the wiring on side B use electrolytic copper foil as the conductive material.

8. A stator PCB board for a 12-slot, 10-pole series servo motor according to claim 7, characterized in that, Solder resist ink is applied to the surfaces of the wiring on side A and the wiring on side B.

9. A stator PCB board for a 12-slot, 10-pole series servo motor according to claim 1, characterized in that, The PCB board (25) is provided with several positioning slots.

10. A 12-slot, 10-pole series servo motor stator PCB board according to claim 1 or 9, characterized in that, The PCB board (25) is provided with several anti-foolproof grooves.

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