A laser activatable selective metallization compound and a permanent magnet synchronous brushless motor made therefrom

Abstract

The present application relates to the field of laser-activated selective metallization, and particularly relates to a laser-activated selective metallization composite and a permanent magnet synchronous brushless motor made of the composite. The present application provides a laser-activated selective metallization composite suitable for permanent magnet synchronous brushless motors, and utilizes the composite to prepare a permanent magnet synchronous brushless motor, including the following steps: preparing a laser-activated selective metallization composite, generating a spiral planar inductor coil and a conductive metal through hole on the surface and inside of the laser-activated selective metallization composite respectively through laser activation, electroless plating and electroplating, and assembling the permanent magnet synchronous brushless motor. The permanent magnet synchronous brushless motor of the present application is low in cost and convenient to manufacture, and can significantly reduce production cost. At the same time, the preparation process is highly automated, avoiding tedious manual labor. The prepared permanent magnet synchronous brushless motor is small in size, thin in thickness, low in weight, stable in rotation speed, and has a good application prospect.

Description

Technical Field

[0001] This invention relates to the field of laser-activated selective metallization, and specifically to a composite material that can be laser-activated selectively metallized and a permanent magnet synchronous brushless motor made therefrom. Background Technology

[0002] Permanent magnet synchronous brushless motors have undergone over 200 years of experience and technological advancement since their inception, and today play a vital role in my country's large-scale socialized production and modernized household life. However, of the approximately 2.4 billion kilowatts of installed capacity, asynchronous motors still account for over 85% of the total installed motor capacity nationwide, consuming about 60% of the country's annual electricity. The operating efficiency of these commercial motors is 10-15 percentage points lower than the most advanced levels in the field, equivalent to wasting hundreds of billions of kilowatt-hours of electricity annually. This demonstrates that, on the one hand, the problem of energy waste remains serious, largely due to the large size and weight of the dominant industrial asynchronous motors; on the other hand, it also indicates that there is still significant potential and room for development in motor technology.

[0003] Chinese patent ZL201811284450.2 discloses a miniature PCB motor that can provide large torque, is small in size and light in weight, and solves the problems of serious energy waste and low motor efficiency to a certain extent. However, the manufacturing process is complicated and requires heavy manual labor during production.

[0004] Laser-activated selective metallization (LISM) is a processing technique that uses computer-controlled laser light to irradiate molded or cast plastic bodies, rapidly activating circuit patterns. The activated surface is then chemically plated, depositing metals such as copper, nickel, and gold into the activated areas to form conductive lines. This process allows for highly flexible and efficient production while saving labor and reducing costs.

[0005] To overcome the shortcomings of existing permanent magnet synchronous brushless motors (PMSMs), it is necessary to develop a low-cost and easily manufactured PMSM prepared by laser-activated selective metallization, thereby enriching the fabrication methods for PMSMs and broadening their application fields. However, the design of structures such as helical inductors and through-holes in PMSMs is quite intricate. How to adjust the composition of the laser-activated selective metallization composite material to ensure that the prepared metal layer meets the performance requirements of PMSMs remains a pressing problem to be solved in this field. Summary of the Invention

[0006] This invention provides a composite material that can be selectively metallized by laser activation, and achieves the purpose of preparing a permanent magnet synchronous brushless motor by selectively metallizing by laser activation.

[0007] A laser-activated selective metallization composite is made from the following raw materials in the indicated mass fractions:

[0008] Epoxy resin 25-89%,

[0009] Laser sensitizer 1-15%,

[0010] Hardener 10-60%.

[0011] Preferably, it is made from raw materials in the following mass fractions:

[0012] Epoxy resin 50-80%,

[0013] Laser sensitizer 5-10%,

[0014] Hardener 15-40%.

[0015] Preferably, the epoxy resin is selected from any one or a combination of two or more of the following: bisphenol A, bisphenol F, bisphenol fluorene, glycidyl ester, phenolic epoxy resin, aliphatic glycidyl ether, and glycidyl amine epoxy resin.

[0016] Preferably, the laser sensitizer is selected from any one or a combination of two or more of the following: copper salts, copper oxides, copper hydroxides, organic copper complexes, chromium salts, chromium oxides, chromium hydroxides, organic chromium complexes, manganese salts, manganese oxides, manganese hydroxides, organic manganese complexes, iron salts, iron oxides, iron hydroxides, organic iron complexes, molybdenum salts, molybdenum oxides, molybdenum hydroxides, organic molybdenum complexes, aluminum salts, aluminum oxides, aluminum hydroxides, organic aluminum complexes, bismuth salts, bismuth oxides, bismuth hydroxides, organic bismuth complexes, tin salts, tin oxides, tin hydroxides, organic tin complexes, antimony salts, antimony oxides, antimony hydroxides, organic antimony complexes, neodymium salts, neodymium oxides, neodymium hydroxides, organic neodymium complexes, tungsten salts, tungsten oxides, and tungsten acids.

[0017] Preferably, the curing agent is any one or a combination of two or more of polyamine, acid anhydride, imidazole, and tertiary amine curing agents.

[0018] The present invention also provides a method for preparing the above-mentioned complex, comprising the following steps:

[0019] Step a: Stir the epoxy resin and laser sensitizer evenly to obtain a liquid mixture;

[0020] Step b: Add curing agent to the liquid mixture and stir until homogeneous. After standing, cure at the curing temperature of the epoxy resin.

[0021] This invention also provides a method for fabricating a permanent magnet synchronous brushless motor by laser-activated selective metallization, comprising the following steps:

[0022] Step S1: Prepare a laser-activated selective metallization composite.

[0023] The above-mentioned laser-activated selective metallization composite was prepared in a mold;

[0024] Step S2, prepare through holes:

[0025] Based on the stator design of the permanent magnet synchronous brushless motor, through holes are fabricated on the composite material;

[0026] Step S3, laser selective activation and metallization:

[0027] The composite obtained in step S2 is selectively activated by laser, followed by chemical plating, so that conductive metal is selectively deposited in the activated area and inside the through hole. After the chemical plating is completed, a spiral planar inductor coil and conductive metal through hole are formed on the surface of the composite.

[0028] Step S4, further electroplating the composite:

[0029] The composite obtained in step S3 is electroplated to increase the thickness of the conductive metal formed by chemical plating in step S3. The composite after electroplating is used as the stator of a permanent magnet synchronous brushless motor.

[0030] Step S5: Assemble the permanent magnet synchronous brushless motor.

[0031] The stator of the permanent magnet synchronous brushless motor obtained after electroplating in step S4 is connected with other parts to assemble a permanent magnet synchronous brushless motor.

[0032] Preferably, in step S2, the method for preparing the through hole is laser drilling;

[0033] And / or, in step S3, the selective activation is performed under a laser with a wavelength of 200-1200 nm.

[0034] Preferably, in step S3, the formed helical planar inductor coils are uniformly distributed on the upper or lower surface of the composite; preferably, the number of helical planar inductor coils on the upper or lower surface of the composite is even, wherein two symmetrical helical planar inductor coils are connected to the same phase.

[0035] And / or, the thickness of the stator is 1.0-3.0 mm.

[0036] The present invention also provides a permanent magnet synchronous brushless motor prepared by the above preparation method.

[0037] This invention provides a laser-activated selective metallization composite suitable for fabricating permanent magnet synchronous brushless motors, and also provides a method for fabricating permanent magnet synchronous brushless motors using this composite. Experimental results show that the permanent magnet synchronous brushless motor fabricated by laser activation selective metallization of this invention is inexpensive and easy to manufacture, significantly reducing the production cost of permanent magnet synchronous brushless motors. Furthermore, the fabrication process of the permanent magnet synchronous brushless motor by laser activation selective metallization is highly automated, avoiding tedious manual labor. The resulting permanent magnet synchronous brushless motor is small in size, with a thickness controlled within 6.0 mm and a weight as low as 26.0-32.0 g, showing great promise for applications.

[0038] Obviously, based on the above description of the present invention, and in accordance with common technical knowledge and conventional methods in the field, various other modifications, substitutions, or alterations can be made without departing from the basic technical concept of the present invention.

[0039] The following detailed embodiments further illustrate the above-described content of the present invention. However, this should not be construed as limiting the scope of the present invention to the following examples; all technologies implemented based on the above-described content of the present invention fall within the scope of the present invention. Attached Figure Description

[0040] Figure 1 This is a circuit diagram of the laser activation circuit used in Example 1;

[0041] Figure 2 This is a diagram of the laser-cut rotor frame used in Example 1;

[0042] Figure 3 This is a schematic diagram of the assembly of the permanent magnet synchronous brushless motor prepared by laser-activated selective metallization in Example 1. Detailed Implementation

[0043] The raw materials and equipment used in the specific embodiments of the present invention are all known products, obtained by purchasing commercially available products.

[0044] (1) The equipment information used in this invention is as follows:

[0045] Laser marking machine, model MUV-ER, pulsed laser marking machine, maximum laser power 5W, laser wavelength 355nm;

[0046] Laser marking machine, model MF-EA, fiber pulse laser marking machine, maximum laser power 20W, laser wavelength 1064nm;

[0047] Laser marking machine, model YK-F20G, fiber pulse laser marking machine, maximum laser power 10W, laser wavelength 532nm.

[0048] (2) The specific information of the matrix polymer of the present invention is as follows:

[0049] Bisphenol A epoxy resin (EP): Chengdu Kelon Reagent, E-51;

[0050] Bisphenol F epoxy resin (EP): Chengdu Kelon Reagent, BPF;

[0051] Bisphenol Fluorene Epoxy Resin (EP): Chengdu Kelon Reagent, BPFG

[0052] Glycidyl ester epoxy resin (EP): Chengdu Kelon Reagent, TDE-85;

[0053] Aliphatic glycidyl ether epoxy resin (EP): Chengdu Kelong Reagent, n-butyl glycidyl ether, epoxy value: 0.5;

[0054] Glycidylamine epoxy resin (EP): Chengdu Kelon Reagent, MF-4230;

[0055] Amine curing agents: Chengdu Kelon Reagent, tetraethylenepentamine (TEPA), analytical grade;

[0056] Anhydride curing agent: Chengdu Kelong Reagent, phthalic anhydride (PA), analytical grade.

[0057] Example 1

[0058] S1. Preparation of laser-activated selective metallization composites

[0059] 90.1g of E-51 and 0.9g of copper-chromium composite oxide were weighed into a beaker and dispersed in a high-speed homogenizer at room temperature for 1 hour to obtain a liquid mixture. 9g of TEPA was added and stirring was continued for 1 hour to obtain a liquid composite. After standing for 1 hour, the bubbles on the surface of the liquid composite were eliminated. The mixture was poured into a mold and cured at room temperature for 10 hours. Finally, it was cured a second time at 50°C for 1 hour to eliminate residual stress, thus obtaining a castable plate of the laser-activated selective metallization composite.

[0060] S2. Laser-selective activation and metallization

[0061] The structure and stator circuit design of the permanent magnet synchronous brushless motor can be implemented based on existing technology. In this embodiment, the circuit diagram is designed as follows: Figure 1 As shown, the spiral planar inductor coil is fan-shaped, and metal through holes are designed at both ends of the spiral planar inductor.

[0062] according to Figure 1The circuit diagram in the diagram first uses laser drilling to create through-holes. Then, in the areas where spiral planar inductors and metal through-holes need to be generated, laser activation is performed under the following conditions: laser speed of 2000 mm / s, laser energy of 16 W, laser frequency of 60 kHz, and laser wavelength of 1064 nm.

[0063] According to well-known laser-activated selective metallization resin electroless plating methods and processes, the laser-activated cast plate is electroless coated with copper. The composite is electroless coated with copper according to well-known industry electroless copper plating formulas, methods, and processes, with continuous air introduction and stirring to ensure the uniformity of the copper plating reaction. The stator thickness is 1.0-3.0 mm.

[0064] S3. Further electroplating

[0065] After chemical copper plating, the surface of the substrate is covered with spiral planar inductor coils and conductive metal through holes. It is then further electroplated according to industry-standard methods and processes, using the following parameters: current 150mA, time 1.5-2.0h. The electroplated substrate is used as the stator of a permanent magnet synchronous brushless motor.

[0066] S4. Assemble a permanent magnet synchronous brushless motor

[0067] according to Figure 2 The drawings in the diagram show that the cast plate of another laser-activated selective metallization composite is laser-cut under the following conditions to obtain the rotor frame: speed of 2000 mm / s, laser energy of 16W, laser frequency of 60kHz, until the desired rotor frame is obtained.

[0068] Then, permanent magnets and shafts are installed in the reserved holes on the outside and center of the rotor, respectively, and rolling bearings are installed in the reserved hole in the center of the stator.

[0069] Finally, the rotor shaft and stator bearings are aligned to form a parallel arrangement of "stator-rotor-stator". The distance between the rotor and stator is 2.0 mm.

[0070] The following effect and / or performance tests and evaluations need to be conducted throughout the process:

[0071] (1) Chemical plating effect: visual inspection;

[0072] (2) Conductivity of metal through holes: Use a multimeter to test whether the two sides of the through hole are connected;

[0073] (3) Back EMF: Back EMF can characterize the strength of a motor’s ability to convert electrical energy into mechanical energy. The larger the back EMF, the greater the ability of electrical energy to be converted into mechanical energy, and the better the motor’s rotation performance.

[0074] (4) Cross-cut adhesion test: According to ASTM D3359, use a cross-cutting tool to draw a 1mm × 1mm square grid on the copper plating area. Then, apply Scotch 3M 600-1PK test tape to the grid area and quickly peel it off. Determine the adhesion strength level based on the area of ​​copper plating detached. In the ASTM D3359 grading standard, a higher grade indicates stronger adhesion between the polymer substrate and the copper plating. Specifically:

[0075] The peeling area of ​​the 0B mesh is greater than 65%;

[0076] The peeling area of ​​1B grid is 35%-65%;

[0077] The peeling area of ​​2B grids is 15%-35%;

[0078] The peeling area of ​​3B mesh is 5%-15%;

[0079] The peeling area of ​​the 4B grid is 5%;

[0080] 5B has no mesh peeling.

[0081] The experimental results are shown in Table 1.

[0082] Example 2

[0083] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1, with the only difference being the matrix polymer, laser sensitizing agent and curing agent used: 86.2g of E-51 resin, 0.9g of copper chromium composite oxide powder and 12.9g of TEPA as laser sensitizing agents.

[0084] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0085] Example 3

[0086] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1. The difference was that the laser activation process used a pulsed ultraviolet laser with a wavelength of 355 nm, a speed of 2000 mm / s, a laser energy of 2.5 W, and a laser frequency of 60 kHz. The matrix polymer, laser sensitizing agent, and curing agent were: 70.9 g of E-51 resin, 0.7 g of copper chromium composite oxide powder and 28.4 g of TEPA.

[0087] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0088] Example 4

[0089] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1. The difference was that the laser activation process used a pulsed ultraviolet laser with a wavelength of 355 nm, a speed of 2000 mm / s, a laser energy of 2.5 W, and a laser frequency of 60 kHz. The matrix polymer, laser sensitizing agent, and curing agent were: 62.1 g of E-51 resin, 0.6 g of copper chromium composite oxide powder and 37.3 g of TEPA.

[0090] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0091] Example 5

[0092] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1. The difference was that a pulsed laser was used in the laser activation process, with a laser wavelength of 532 nm, a speed of 2000 mm / s, a laser energy of 6 W, and a laser frequency of 60 kHz. The matrix polymer, laser sensitizing agent, and curing agent were: 87.0 g of E-51 resin, 4.35 g of copper chromium composite oxide powder and 8.7 g of TEPA laser sensitizing agent.

[0093] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0094] Example 6

[0095] The composite was selectively laser activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1. The difference was that the laser activation process used a pulsed laser with a wavelength of 190 nm, and the matrix polymer, laser sensitizing agent and curing agent were: 83.3 g of E-51 resin, 4.17 g of antimony-doped tin oxide powder and 12.5 g of TEPA.

[0096] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0097] Example 7

[0098] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1. The difference was that a pulsed laser was used in the laser activation process, with a laser wavelength of 532 nm, a speed of 2000 mm / s, a laser energy of 6 W, and a laser frequency of 60 kHz. The matrix polymer, laser sensitizing agent, and curing agent were: 69.0 g of E-51 resin, 3.45 g of antimony-doped tin oxide powder and 27.6 g of TEPA as laser sensitizing agents.

[0099] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0100] Example 8

[0101] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1, with the only difference being the matrix polymer, laser sensitizing agent and curing agent used: 60.6g of BPF resin, 3.03g of antimony-doped tin oxide powder and 36.4g of TEPA as laser sensitizing agents.

[0102] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0103] Example 9

[0104] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1, with the only difference being the matrix polymer, laser sensitizing agent and curing agent used: 83.3g of BPF resin, 8.3g of antimony-doped tin oxide powder and 8.3g of TEPA as laser sensitizing agents.

[0105] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0106] Example 10

[0107] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1, with the only difference being the matrix polymer, laser sensitizing agent and curing agent used: 80g of BPF resin, 8.0g of antimony-doped tin oxide powder and 12.0g of TEPA as laser sensitizing agents.

[0108] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0109] Example 11

[0110] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1, with the only difference being the matrix polymer, laser sensitizing agent and curing agent used: 66.7g of BPF resin, 6.7g of antimony-doped tin oxide powder and 26.7g of TEPA as laser sensitizing agents.

[0111] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0112] Example 12

[0113] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1. The difference was that the laser activation process used a pulsed ultraviolet laser with a wavelength of 355 nm, a speed of 2000 mm / s, a laser energy of 2.5 W, and a laser frequency of 60 kHz. The matrix polymer, laser sensitizing agent, and curing agent were: 58.9 g of BPF resin, 5.9 g of antimony-doped tin oxide powder and 35.3 g of TEPA.

[0114] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0115] Example 13

[0116] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1. The difference was that the laser activation process used a pulsed ultraviolet laser with a wavelength of 355 nm, a speed of 2000 mm / s, a laser energy of 2.5 W, and a laser frequency of 60 kHz. The matrix polymer, laser sensitizing agent, and curing agent were: 80.0 g of BPF resin, 12.0 g of copper chromium composite oxide powder and 8.0 g of TEPA.

[0117] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0118] Example 14

[0119] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1. The difference was that the laser activation process used a pulsed ultraviolet laser with a wavelength of 355 nm, a speed of 2000 mm / s, a laser energy of 2.5 W, and a laser frequency of 60 kHz. The matrix polymer, laser sensitizing agent, and curing agent were: 76.9 g of BPF resin, 11.5 g of copper chromium composite oxide powder and 11.5 g of TEPA laser sensitizing agent.

[0120] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0121] Example 15

[0122] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1. The difference was that the laser activation process used a pulsed ultraviolet laser with a wavelength of 532 nm, a speed of 2000 mm / s, a laser energy of 6 W, and a laser frequency of 60 kHz. The matrix polymer, laser sensitizing agent, and curing agent were: 64.5 g of BPFG resin, 9.7 g of copper chromium composite oxide powder and 25.8 g of TEPA.

[0123] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0124] Example 16

[0125] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1. The difference was that the laser activation process used a pulsed ultraviolet laser with a wavelength of 532 nm, a speed of 2000 mm / s, a laser energy of 2 W, and a laser frequency of 60 kHz. The matrix polymer, laser sensitizing agent, and curing agent were: 57.1 g of BPFG resin, 8.6 g of copper chromium composite oxide powder and 34.3 g of TEPA.

[0126] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0127] Example 17

[0128] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1, with the only difference being the matrix polymer, laser sensitizing agent and curing agent used: 90.1g of BPFG resin, 0.9g of antimony-doped tin oxide powder and 9g of PA as laser sensitizing agents.

[0129] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0130] Example 18

[0131] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1. The difference was that the laser activation process used a pulsed ultraviolet laser with a wavelength of 355 nm, a speed of 2000 mm / s, a laser energy of 2.5 W, and a laser frequency of 60 kHz. The matrix polymer, laser sensitizing agent, and curing agent were: 86.2 g of BPFG resin, 0.9 g of antimony-doped tin oxide powder and 12.9 g of PA.

[0132] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0133] Example 19

[0134] The composite was selectively laser activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1. The difference was that a pulsed laser was used in the laser activation process, with a laser wavelength of 532 nm, a speed of 2000 mm / s, a laser energy of 2.5 W, and a laser frequency of 60 kHz. The matrix polymer, laser sensitizing agent, and curing agent were: 70.9 g of BPFG resin, 0.7 g of antimony-doped tin oxide powder and 28.4 g of PA.

[0135] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0136] Example 20

[0137] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1, with the only difference being the matrix polymer, laser sensitizing agent and curing agent used: 62.1g of BPFG resin, 0.6g of antimony-doped tin oxide powder and 37.3g of PA as laser sensitizing agents.

[0138] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0139] Example 21

[0140] The composite was selectively laser activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1, with the only difference being the matrix polymer, laser sensitizing agent and curing agent used: 87.0g of BPFG resin, 4.35g of antimony-doped tin oxide powder and 8.7g of PA as laser sensitizing agents.

[0141] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0142] Example 22

[0143] The composite was selectively laser activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1, with the only difference being the matrix polymer, laser sensitizing agent and curing agent used: 83.3g of TDE-85 resin, 4.17g of antimony-doped tin oxide powder and 12.5g of PA as laser sensitizing agents.

[0144] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0145] Example 23

[0146] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1. The difference was that the laser activation process used an ultraviolet pulsed laser with a wavelength of 532 nm, a speed of 2000 mm / s, a laser energy of 6 W, and a laser frequency of 60 kHz. The matrix polymer, laser sensitizing agent, and curing agent were: 69.0 g of TDE-85 resin, 3.45 g of antimony-doped tin oxide powder, and 27.6 g of PA.

[0147] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0148] Example 24

[0149] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1, with the only difference being the matrix polymer, laser sensitizing agent and curing agent used: 60.6g of TDE-85 resin, 3.03g of antimony-doped tin oxide powder and 36.4g of PA as laser sensitizing agents.

[0150] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0151] Example 25

[0152] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1. The difference was that the laser activation process used a pulsed ultraviolet laser with a wavelength of 355 nm, a speed of 2000 mm / s, a laser energy of 2.5 W, and a laser frequency of 60 kHz. The matrix polymer, laser sensitizing agent, and curing agent were: 83.3 g of TDE-85 resin, 8.3 g of copper chromium composite oxide powder and 8.3 g of PA laser sensitizing agent.

[0153] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0154] Example 26

[0155] The composite was selectively laser activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1. The difference was that a pulsed laser was used in the laser activation process, with a laser wavelength of 532nm, a speed of 2000mm / s, a laser energy of 6W, and a laser frequency of 60kHz. The matrix polymer, laser sensitizing agent and curing agent were: 80g of TDE-85 resin, 8.0g of copper chromium composite oxide powder and 12.0g of PA.

[0156] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0157] Example 27

[0158] The permanent magnet synchronous brushless motor was prepared by selectively laser activating the composite according to the method of Example 1, with the only difference being the use of the matrix polymer, laser sensitizing agent and curing agent: 66.7g of TDE-85 resin, 6.7g of laser sensitizing agent copper chromium composite oxide powder and 26.7g of PA.

[0159] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0160] Example 28

[0161] The permanent magnet synchronous brushless motor was prepared by selectively laser activating the composite according to the method of Example 1, with the only difference being the use of the matrix polymer, laser sensitizing agent and curing agent: 58.9g of TDE-85 resin, 5.9g of copper chromium composite oxide powder and 35.3g of PA as laser sensitizing agents.

[0162] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0163] Example 29

[0164] The composite was selectively laser activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1. The difference was that the laser activation process used a pulsed ultraviolet laser with a wavelength of 355 nm, a speed of 2000 mm / s, a laser energy of 2.5 W, and a laser frequency of 60 kHz. The matrix polymer, laser sensitizing agent, and curing agent were: 80.0 g of n-butyl glycidyl ether, 12.0 g of copper chromium composite oxide powder and 8.0 g of PA.

[0165] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0166] Example 30

[0167] The composite was selectively laser activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1, with the only difference being the use of the matrix polymer, laser sensitizing agent and curing agent: 76.9g of n-butyl glycidyl ether, 11.5g of laser sensitizing agent copper chromium composite oxide powder and 11.5g of PA.

[0168] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0169] Example 31

[0170] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1, with the only difference being the matrix polymer, laser sensitizing agent and curing agent used: 64.5g of n-butyl glycidyl ether, 9.7g of antimony-doped tin oxide powder and 25.8g of PA as laser sensitizing agents.

[0171] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0172] Example 32

[0173] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1, with the only difference being the matrix polymer, laser sensitizing agent and curing agent used: 57.1g of n-butyl glycidyl ether, 8.6g of antimony-doped tin oxide powder and 34.3g of PA as laser sensitizing agents.

[0174] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0175] Example 33

[0176] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1, with the only difference being the matrix polymer, laser sensitizing agent and curing agent used: 87.0g of E-51 resin, 4.35g of basic copper phosphate powder and 8.7g of TEPA as laser sensitizing agents.

[0177] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0178] Example 34

[0179] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1, with the only difference being the matrix polymer, laser sensitizing agent and curing agent used: 83.3g of E-51 resin, 4.17g of basic copper phosphate powder and 12.5g of TEPA as laser sensitizing agents.

[0180] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0181] Example 35

[0182] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1, with the only difference being the matrix polymer, laser sensitizing agent and curing agent used: 69.0g of E-51 resin, 3.45g of basic copper phosphate powder and 27.6g of TEPA as laser sensitizing agents.

[0183] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0184] Example 36

[0185] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1, with the only difference being the matrix polymer, laser sensitizing agent and curing agent used: 60.6g of E-51 resin, 3.03g of basic copper phosphate powder and 36.4g of TEPA as laser sensitizing agents.

[0186] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0187] Example 37

[0188] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1, with the only difference being the matrix polymer, laser sensitizing agent and curing agent used: 87.0g of E-51 resin, 4.35g of molybdenum trioxide powder and 8.7g of PA as laser sensitizing agents.

[0189] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0190] Example 38

[0191] The composite was selectively laser activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1, with the only difference being the matrix polymer, laser sensitizing agent and curing agent used: 83.3g of E-51 resin, 4.17g of molybdenum trioxide powder and 12.5g of PA as laser sensitizing agents.

[0192] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0193] Example 39

[0194] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1, with the only difference being the matrix polymer, laser sensitizing agent and curing agent used: 69.0g of E-51 resin, 3.45g of molybdenum trioxide powder and 27.6g of PA as laser sensitizing agents.

[0195] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0196] Example 40

[0197] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1, with the only difference being the matrix polymer, laser sensitizing agent and curing agent used: 60.6g of E-51 resin, 3.03g of molybdenum trioxide powder and 36.4g of PA as laser sensitizing agents.

[0198] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0199] Example 41

[0200] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1, with the only difference being the matrix polymer, laser sensitizing agent and curing agent used: 87.0g of TDE-85 resin, 4.35g of copper acetylacetonate powder and 8.7g of PA as laser sensitizing agents.

[0201] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0202] Example 42

[0203] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1, with the only difference being the matrix polymer, laser sensitizing agent and curing agent used: 87.0g of TDE-85 resin, 4.35g of copper acetylacetonate powder and 8.7g of PA as laser sensitizing agents.

[0204] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0205] Example 43

[0206] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1, with the only difference being the matrix polymer, laser sensitizing agent and curing agent used: 87.0g of TDE-85 resin, 4.35g of copper oxalate powder and 8.7g of PA as laser sensitizing agents.

[0207] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0208] Example 44

[0209] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1, with the only difference being the matrix polymer, laser sensitizing agent and curing agent used: 83.3g of TDE-85 resin, 4.17g of copper oxalate powder and 12.5g of PA as laser sensitizing agents.

[0210] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0211] Example 45

[0212] The composite was selectively laser activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1, with the only difference being the use of the matrix polymer, laser sensitizing agent and curing agent: 69.0g of n-butyl glycidyl ether, 3.45g of copper oxalate powder and 27.6g of PA as laser sensitizing agents.

[0213] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0214] Example 46

[0215] The permanent magnet synchronous brushless motor was prepared by selectively laser activating the composite according to the method of Example 1, with the only difference being the matrix polymer, laser sensitizing agent and curing agent used: 60.6g of n-butyl glycidyl ether, 3.03g of copper oxalate powder and 36.4g of PA.

[0216] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0217] Comparative Example 1

[0218] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1, with the only difference being the matrix polymer, laser sensitizing agent and curing agent used: 58.5g of EP-51 resin, 0.47g of copper chromium composite oxide powder and 41.0g of TEPA as laser sensitizing agents.

[0219] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0220] Comparative Example 2

[0221] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1, with the only difference being the matrix polymer, laser sensitizing agent and curing agent used: 58.5g of EP-51 resin, 0.47g of copper oxalate powder and 41.0g of TEPA as laser sensitizing agents.

[0222] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0223] Comparative Example 3

[0224] The composite was selectively laser activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1. The difference was that the laser activation process used a pulsed ultraviolet laser with a wavelength of 355 nm, a speed of 2000 mm / s, a laser energy of 2.5 W, and a laser frequency of 60 kHz. The matrix polymer, laser sensitizing agent, and curing agent were: 58.5 g of EP-51 resin, 0.47 g of copper chromium composite oxide powder and 41.0 g of TEPA.

[0225] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0226] Comparative Example 4

[0227] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1. The difference was that the laser activation process used a pulsed ultraviolet laser with a wavelength of 355 nm, a speed of 2000 mm / s, a laser energy of 2.5 W, and a laser frequency of 60 kHz. The matrix polymer, laser sensitizing agent, and curing agent were: 58.5 g of EP-51 resin, 0.47 g of copper oxalate powder and 41.0 g of TEPA.

[0228] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0229] Comparative Example 5

[0230] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1. The difference was that a pulsed laser was used in the laser activation process, with a laser wavelength of 532 nm, a speed of 2000 mm / s, a laser energy of 6 W, and a laser frequency of 60 kHz. The matrix polymer, laser sensitizing agent, and curing agent were: 58.7 g of EP-51 resin, 0.3 g of antimony-doped tin oxide powder and 41.0 g of TEPA.

[0231] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0232] Comparative Example 6

[0233] The composite was selectively laser activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1. The difference was that a pulsed laser was used in the laser activation process, with a laser wavelength of 532 nm, a speed of 2000 mm / s, a laser energy of 6 W, and a laser frequency of 60 kHz. The matrix polymer, laser sensitizing agent, and curing agent were: 58.7 g of EP-51 resin, 0.3 g of copper oxalate powder and 41.0 g of TEPA.

[0234] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0235] Comparative Example 7

[0236] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1. The difference was that a pulsed laser was used in the laser activation process, with a laser wavelength of 532 nm, a speed of 2000 mm / s, a laser energy of 6 W, and a laser frequency of 60 kHz. The matrix polymer, laser sensitizing agent, and curing agent were: 58.7 g of EP-51 resin, 0.3 g of basic copper phosphate powder and 41.0 g of TEPA.

[0237] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0238] Comparative Example 8

[0239] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1, with the only difference being the matrix polymer, laser sensitizing agent and curing agent used: 58.7g of BPF resin, 0.3g of antimony-doped tin oxide powder and 41.0g of TEPA as laser sensitizing agents.

[0240] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0241] Comparative Example 9

[0242] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1, with the only difference being the matrix polymer, laser sensitizing agent and curing agent used: 58.5g of BPF resin, 0.47g of antimony-doped tin oxide powder and 41.0g of TEPA as laser sensitizing agents.

[0243] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0244] Comparative Example 10

[0245] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1, with the only difference being the matrix polymer, laser sensitizing agent and curing agent used: 58.5g BPF resin, 0.47g copper oxalate powder and 41.0g TEPA laser sensitizing agent.

[0246] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0247] Comparative Example 11

[0248] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1. The only difference was that a pulsed ultraviolet laser was used in the laser activation process. The laser wavelength was 355 nm, the speed was 2000 mm / s, the laser energy was 2.5 W, and the laser frequency was 60 kHz. The matrix polymer, laser sensitizing agent and curing agent were: 58.5 g of BPF resin, 0.47 g of antimony-doped tin oxide powder and 41.0 g of TEPA.

[0249] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0250] Comparative Example 12

[0251] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1. The difference was that the laser activation process used a pulsed ultraviolet laser with a wavelength of 355 nm, a speed of 2000 mm / s, a laser energy of 2.5 W, and a laser frequency of 60 kHz. The matrix polymer, laser sensitizing agent, and curing agent were: 58.5 g of BPF resin, 0.47 g of copper oxalate powder and 41.0 g of TEPA.

[0252] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0253] Comparative Example 13

[0254] The composite was selectively laser activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1. The difference was that the laser activation process used a pulsed ultraviolet laser with a wavelength of 355 nm, a speed of 2000 mm / s, a laser energy of 2.5 W, and a laser frequency of 60 kHz. The matrix polymer, laser sensitizing agent, and curing agent were: 58.5 g of EP-51 resin, 0.47 g of antimony-doped tin oxide powder and 41.0 g of PA.

[0255] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0256] Comparative Example 14

[0257] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1. The difference was that the laser activation process used a pulsed ultraviolet laser with a wavelength of 355 nm, a speed of 2000 mm / s, a laser energy of 2.5 W, and a laser frequency of 60 kHz. The matrix polymer, laser sensitizing agent, and curing agent were: 58.5 g of EP-51 resin, 0.47 g of copper oxalate powder and 41.0 g of PA.

[0258] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0259] Comparative Example 15

[0260] The composite was selectively laser activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1. The difference was that the laser activation process used a pulsed ultraviolet laser with a wavelength of 355 nm, a speed of 2000 mm / s, a laser energy of 2.5 W, and a laser frequency of 60 kHz. The matrix polymer, laser sensitizing agent, and curing agent were: 58.5 g of EP-51 resin, 0.47 g of antimony-doped tin oxide powder and 41.0 g of PA.

[0261] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0262] Comparative Example 16

[0263] The composite was selectively laser-activated and a permanent magnet synchronous brushless motor was prepared according to the method of Example 1. The difference was that the laser activation process used a pulsed ultraviolet laser with a wavelength of 355 nm, a speed of 2000 mm / s, a laser energy of 2.5 W, and a laser frequency of 60 kHz. The matrix polymer, laser sensitizing agent, and curing agent were: 58.5 g of EP-51 resin, 0.47 g of copper oxalate powder and 41.0 g of PA.

[0264] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0265] Comparative Example 17

[0266] A permanent magnet synchronous brushless motor was prepared by selectively laser-activating the composite according to the method of Example 1, the difference being that the matrix polymer, laser sensitizing agent, and curing agent were: 90.1g of E-51 resin, 0.9g of copper-chromium composite oxide powder as laser sensitizing agent, and 9.0g of TEPA. The composite was directly assembled into a permanent magnet synchronous brushless motor after chemical copper plating without undergoing an electroplating process.

[0267] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0268] Comparative Example 18

[0269] A permanent magnet synchronous brushless motor was prepared by selectively laser-activating the composite according to the method of Example 1, with the only difference being the matrix polymer, laser sensitizing agent, and curing agent used: 86.2g of E-51 resin, 0.9g of copper-chromium composite oxide powder as laser sensitizing agent, and 12.9g of TEPA. The composite was directly assembled into a permanent magnet synchronous brushless motor after electroless copper plating without undergoing an electroplating process.

[0270] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0271] Comparative Example 19

[0272] A permanent magnet synchronous brushless motor was prepared by selectively laser-activating the composite material according to the method in Example 1. The difference was that a pulsed ultraviolet laser was used in the laser activation process, with a laser wavelength of 355 nm, a speed of 2000 mm / s, a laser energy of 2.5 W, and a laser frequency of 60 kHz. The matrix polymer, laser sensitizing agent, and curing agent were: 70.9 g of E-51 resin, 0.7 g of copper-chromium composite oxide powder as laser sensitizing agent, and 28.4 g of TEPA. After chemical copper plating, the composite material was directly assembled into a permanent magnet synchronous brushless motor without electroplating.

[0273] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0274] Comparative Example 20

[0275] A permanent magnet synchronous brushless motor was prepared by selectively laser-activating the composite material according to the method in Example 1. The difference was that a pulsed ultraviolet laser was used in the laser activation process, with a laser wavelength of 355 nm, a speed of 2000 mm / s, a laser energy of 2.5 W, and a laser frequency of 60 kHz. The matrix polymer, laser sensitizing agent, and curing agent were: 62.1 g of E-51 resin, 0.6 g of copper-chromium composite oxide powder as laser sensitizing agent, and 37.3 g of TEPA. After chemical copper plating, the composite material was directly assembled into a permanent magnet synchronous brushless motor without electroplating.

[0276] The test method was the same as in Example 1, and the test results are shown in Table 1.

[0277] Comparative Example 21

[0278] The standard 130 DC motor sold in the market is manufactured by Xinxida.

[0279] Comparative Example 22

[0280] The A2212 brushless motor is a common commercially available product manufactured by XinXida.

[0281] Comparative Example 23

[0282] The A2208 brushless motor is a common commercially available product manufactured by XinXida.

[0283] Table 1. Key parameters and test results of Examples 1-46 and Comparative Examples 1-20

[0284]

[0285] As can be seen from Table 1, Examples 1-46 successfully prepared the required circuits and conductive metal vias on the substrate surface by using a laser-activated selective metallization method with various types of epoxy resins, different laser sensitizers, different amounts of laser sensitizers, different curing agents, and different amounts of curing agents. After electroplating, they have the ability to convert electrical energy into mechanical energy and can be used to assemble permanent magnet synchronous brushless motors.

[0286] In Comparative Examples 1-16, after altering the raw material ratio of the laser-activated selective metallization composite (e.g., when the laser sensitizer concentration was below 0.8 wt.%), laser activation resulted in either failure to deposit metal or the obtained metal coating lacking practical application value. Meanwhile, in Comparative Examples 17-20, the circuits prepared without electroplating exhibited poor conductivity and energy conversion capabilities. In actual experiments, the permanent magnet synchronous motors prepared and assembled without electroplating not only required a higher driving voltage but also suffered from unstable operation due to short circuits and open circuits caused by easy oxidation of the circuitry.

[0287] The weight of the motors prepared in the examples and comparative examples was further tested, and the results are shown in Table 2.

[0288] Table 2. Axial diameter, length, and weight of the motors prepared in the examples and comparative examples.

[0289]

[0290] Figure 3This is a schematic diagram of the assembly structure of the permanent magnet synchronous brushless motor prepared by laser-activated selective metallization as shown in Example 1. As can be seen from the results in Table 2, due to the introduction of the laser-activated selective metallization process, the stator and other parts of the motor can be designed to be very thin. This makes the permanent magnet synchronous brushless motor prepared by this invention smaller in size, thinner in thickness, and lighter in weight compared to the motors prepared by existing methods in Comparative Examples 21-23. Furthermore, the preparation process of this invention has a high degree of automation, which can significantly reduce the production cost of the permanent magnet synchronous brushless motor, making it very suitable for industrial production applications.

[0291] As can be seen from the above embodiments, by providing a laser-activated selective metallization composite suitable for permanent magnet synchronous brushless motors, this invention provides a novel permanent magnet synchronous brushless motor and its preparation method. On the one hand, the permanent magnet synchronous brushless motor prepared by this invention is lightweight and compact, offering significant cost advantages; on the other hand, the laser-activated selective metallization process for preparing permanent magnet synchronous brushless motors is highly automated, avoiding tedious manual labor and ensuring a high product yield, thus possessing excellent industrial application value.

Claims

1. A method for fabricating a permanent magnet synchronous brushless motor by laser-activated selective metallization, characterized in that: Includes the following steps: Step S1: Prepare a laser-activated selective metallization composite. Prepare laser-activated selective metallization composites in a mold; The laser-activated selective metallization composite is made from the following raw materials: epoxy resin, laser sensitizer, and curing agent, wherein the amount of laser sensitizer is 1-15% of the mass of epoxy resin, and the amount of curing agent is 10-60% of the mass of epoxy resin; Step S2, prepare through holes: Based on the stator design of the permanent magnet synchronous brushless motor, through holes are fabricated on the composite material; Step S3, laser selective activation and metallization: The composite obtained in step S2 is selectively activated by laser, followed by chemical plating, so that conductive metal is selectively deposited in the activated area and inside the through hole. After the chemical plating is completed, a spiral planar inductor coil and conductive metal through hole are formed on the surface of the composite. Step S4, further electroplating the composite: The composite obtained in step S3 is electroplated to increase the thickness of the conductive metal formed by chemical plating in step S3. The composite after electroplating is used as the stator of a permanent magnet synchronous brushless motor. Step S5: Assemble the permanent magnet synchronous brushless motor. The stator of the permanent magnet synchronous brushless motor obtained after electroplating in step S4 is connected with other parts to assemble a permanent magnet synchronous brushless motor.

2. The preparation method according to claim 1, characterized in that: The laser-activated selective metallization composite is made from the following raw materials: epoxy resin, laser sensitizer and curing agent, wherein the amount of laser sensitizer is 5-10% of the mass of epoxy resin and the amount of curing agent is 15-40% of the mass of epoxy resin.

3. The preparation method according to claim 1 or 2, characterized in that: The epoxy resin is selected from any one or a combination of two or more of the following: bisphenol A, bisphenol F, bisphenol fluorene, glycidyl ester, phenolic epoxy resin, aliphatic glycidyl ether, and glycidyl amine epoxy resin.

4. The preparation method according to claim 1 or 2, characterized in that: The laser sensitizer is selected from any one or a combination of two or more of the following: copper salts, copper oxides, copper hydroxides, organic copper complexes, chromium salts, chromium oxides, chromium hydroxides, organic chromium complexes, manganese salts, manganese oxides, manganese hydroxides, organic manganese complexes, iron salts, iron oxides, iron hydroxides, organic iron complexes, molybdenum salts, molybdenum oxides, molybdenum hydroxides, organic molybdenum complexes, aluminum salts, aluminum oxides, aluminum hydroxides, organic aluminum complexes, bismuth salts, bismuth oxides, bismuth hydroxides, organic bismuth complexes, tin salts, tin oxides, tin hydroxides, organic tin complexes, antimony salts, antimony oxides, antimony hydroxides, organic antimony complexes, neodymium salts, neodymium oxides, neodymium hydroxides, organic neodymium complexes, tungsten salts, tungsten oxides, and tungsten acids.

5. The preparation method according to claim 1 or 2, characterized in that: The curing agent is selected from any one or a combination of two or more of polyamine, acid anhydride, imidazole, and tertiary amine curing agents.

6. The preparation method according to claim 1, characterized in that: In step S2, the method for preparing the through hole is laser drilling; And / or, in step S3, the selective activation is performed under a laser with a wavelength of 200-1200 nm.

7. The preparation method according to claim 1, characterized in that: In step S3, the formed spiral planar inductor coils are uniformly distributed on the upper or lower surface of the composite material; And / or, the thickness of the stator is 1.0-3.0 mm.

8. The preparation method according to claim 7, characterized in that: In step S3, the number of spiral planar inductors on the upper or lower surface of the composite is even, wherein two symmetrical spiral planar inductors are connected to the same phase.

9. A permanent magnet synchronous brushless motor prepared according to the preparation method of any one of claims 1-8.

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