Flexible winding, flexible winding manufacturing method and coreless motor

Abstract

The invention relates to the technical field of hollow cup motors, in particular to a flexible winding, a flexible winding manufacturing method and a hollow cup motor. The first conductive layer is attached to the surface of one side of the flexible core plate; the second conductive layer is attached to the surface of the other side of the flexible core plate; the plurality of first insulating grooves are formed in the surface of one side of the flexible core plate at intervals; the plurality of second insulating grooves are formed in the surface of the other side of the flexible core plate at intervals; and each first conductive line is correspondingly connected with one second conductive line. According to the flexible winding provided by the invention, the use amount of copper at the end part of the winding is obviously reduced, the copper consumption is reduced, the cost is saved, the overall copper utilization rate of the flexible winding is improved, and the arrangement position of the copper wire harness is fixed, so that compared with a traditional resin curing mode, the winding wire width and the wire distance uniformity are improved, the magnetic field distribution is optimized, and the noise and vibration are reduced; the output efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of coreless motors, and particularly to a flexible winding, a method for manufacturing the flexible winding, and a coreless motor. Background Art

[0002] With the explosive growth of intelligent manufacturing, medical precision equipment, and humanoid robot technologies, the bottlenecks of traditional drive motors in the fields of miniaturization, high dynamic response, and precise control have become increasingly prominent. Due to the low moment of inertia, high rotational speed, and fast response ability brought by the coreless rotor structure, the coreless motor has become the core solution to break through the existing technical barriers.

[0003] The existing windings of coreless motors are wound with copper wires. However, the distance between the winding wires obtained in this way is relatively large, the manufacturing level requirements are high, the utilization rate of copper at the ends is low, and in order to meet the high rotational speed and high shear force of the coreless motor, resin is needed to fix the winding. However, the resin curing will cause partial deformation of the winding wires, resulting in uneven distances between the copper wires, thus causing magnetic field non-uniformity, generating noise and vibration during motor rotation, and reducing the output efficiency. This phenomenon is particularly obvious at high rotational speeds. Summary of the Invention

[0004] The purpose of the present application is to provide a flexible winding and a method for manufacturing the flexible winding, so as to solve to a certain extent the technical problem that the existing windings of coreless motors have low copper utilization rate at the ends in the prior art.

[0005] The present application provides a flexible winding, including: A flexible core board, which has insulation properties; A first conductive layer, which is attached to one side surface of the flexible core board; A second conductive layer, which is attached to the other side surface of the flexible core board; A first insulating groove, the number of the first insulating grooves is multiple, and the multiple first insulating grooves are arranged at intervals on one side surface of the flexible core board, and a first conductive line is formed between any two adjacent first insulating grooves; A second insulating groove, the number of the second insulating grooves is multiple, and the multiple second insulating grooves are arranged at intervals on the other side surface of the flexible core board, and a second conductive line is formed between any two adjacent second insulating grooves; Each of the first conductive lines is connected to one of the second conductive lines.

[0006] In the above technical solution, further, the flexible winding is provided with a plurality of connection holes, and each group of the first conductive lines and the second conductive lines are connected at one of the connection holes. In any of the above technical solutions, further, both the first conductive layer and the second conductive layer are copper foils.

[0007] In any of the above technical solutions, further, the connection holes are blind holes, a conduction filler is disposed in the connection holes, and each group of the first conductive lines and the second conductive lines are respectively in contact with the conduction filler.

[0008] In any of the above technical solutions, further, the connection holes are through holes, and each group of the first conductive lines and the second conductive lines are electrically connected at the connection holes.

[0009] In any of the above technical solutions, further, the flexible winding can be surrounded into a cylindrical shape, and the flexible winding in the cylindrical shape includes a first end portion, a second end portion, and a working portion; The first end portion is provided with an incoming lead wire and an outgoing lead wire. The present application also provides a method for manufacturing a flexible winding for manufacturing the flexible winding in any of the above technical solutions. Therefore, it has all the beneficial technical effects of the flexible winding and will not be elaborated herein.

[0010] The method for manufacturing the flexible winding includes the steps of: S1. Blanking: Select a flexible core board, and conductive layers are respectively disposed on both sides of the flexible core board; S2. Drilling: Open a plurality of connection holes in the flexible core board; S3. Hole treatment: Perform black hole treatment or copper deposition treatment on the connection holes; S4. Hole filling: Electroplate the connection holes to connect the two conductive layers at the connection holes; S5. Film pasting: Cover a dry film on the conductive layer; S6. Etching: Etch a plurality of the first insulating grooves on one surface of the flexible winding, and etch a plurality of the second insulating grooves on the other surface of the flexible winding; S7. Solder mask: Use ink to perform solder mask on both surfaces of the flexible core board after etching; S8. Protection treatment: Deposit an anti-oxidation layer on the surfaces of the exposed first conductive lines and the second conductive lines after solder mask.

[0011] In the above technical solution, further, in step S3, when performing black hole treatment on the connection holes, carbon powder is filled into the connection holes, and the carbon powder accumulates 0.5 - 1 μm; or when performing copper deposition treatment on the connection holes, the copper deposition is 0.5 μm. The present application also provides a coreless motor, which includes the flexible winding described in any of the above technical solutions. Therefore, it has all the beneficial technical effects of this flexible winding, and will not be elaborated here.

[0012] In the above technical solution, further, the coreless motor further includes: A housing, wherein the flexible winding is arranged inside the housing; A permanent magnet, which is arranged inside the housing; A main shaft, which penetrates through the flexible winding; A bearing, one end of the main shaft is connected to the bearing.

[0013] In any of the above technical solutions, further, the coreless motor further includes a commutator, and the commutator is arranged inside the housing.

[0014] Compared with the prior art, the beneficial effects of the present application are: The flexible winding provided by the present application includes: a flexible core board, the flexible core board has insulation; a first conductive layer, the first conductive layer is attached to one side surface of the flexible core board; a second conductive layer, the second conductive layer is attached to the other side surface of the flexible core board; a first insulating groove, the number of the first insulating grooves is multiple, the multiple first insulating grooves are arranged at intervals on one side surface of the flexible core board, and a first conductive line is formed between any two adjacent first insulating grooves; a second insulating groove, the number of the second insulating grooves is multiple, the multiple second insulating grooves are arranged at intervals on the other side surface of the flexible core board, and a second conductive line is formed between any two adjacent second insulating grooves; each first conductive line is correspondingly connected to a second conductive line.

[0015] The flexible winding provided by the present application, compared with the traditional winding method, significantly reduces the copper consumption at the winding end, reduces the copper loss, saves costs, improves the overall copper utilization rate of this flexible winding, and the setting position of the copper wire bundle is fixed. Compared with the traditional resin curing method, it improves the uniformity of the winding line width and line distance, optimizes the magnetic field distribution, reduces noise and vibration, and improves the output efficiency. The manufacturing method of the flexible winding provided by the present application obtains the flexible winding by a method similar to processing flexible pcb. The manufacturing process is mature, the yield is high, and it has a high processing efficiency.

[0016] The coreless motor provided by the present application, by using the flexible winding, effectively reduces the copper consumption, is beneficial to cost control, and is convenient to control the volume of the winding, can optimize the internal structure of this coreless motor, and is convenient to control the volume of this coreless motor. Description of the Drawings

[0017] To more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 Schematic winding diagram when the flexible winding provided in the embodiment of the present application is an AC winding; Figure 2 Schematic winding diagram when the flexible winding provided in the embodiment of the present application is a DC winding; Figure 3 Schematic enlarged partial structure diagram of the flexible winding provided in the embodiment of the present application; Figure 4 Schematic structure diagram of the flexible winding in a cylindrical state provided in the embodiment of the present application; Figure 5 Schematic structure diagram of the hollow cup motor provided in the embodiment of the present application when it is an AC hollow cup motor; Figure 6 Schematic structure diagram of the hollow cup motor provided in the embodiment of the present application when it is a DC hollow cup motor.

[0019] Reference numerals: L1 - the first layer of winding, L2 - the second layer of winding, 1 - permanent magnet, 2 - flexible winding, 3 - housing, 4 - commutator, 5 - bearing, 6 - the head end of phase A winding, 7 - the tail end of phase A winding, 8 - the head end of phase B winding, 9 - the tail end of phase B winding, 10 - the head end of phase C winding, 11 - the tail end of phase C winding, 12 - connection hole, 13 - lead one, 14 - lead two, 15 - lead three, 16 - lead four, 17 - lead five, 18 - lead six. Detailed embodiments

[0020] The following will clearly and completely describe the technical solutions of the present application with reference to the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present application.

[0021] The components of the embodiments of the present application usually described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application to be protected, but only represents the selected embodiments of the present application.

[0022] Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present application.

[0023] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0024] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0025] The following refers to Figures 1 to 6 the flexible winding, the method for manufacturing the flexible winding, and the coreless motor described in the embodiments of the present application.

[0026] In a first aspect, as shown in Figures 1 to 4 the embodiments of the present application provide a flexible winding. The flexible winding 2 includes a flexible core plate, a first conductive layer, and a second conductive layer. Among them, the flexible core plate is flexible and can be bent into a cylindrical shape. The flexible core plate also has insulation properties. Preferably, the flexible core plate is a rectangular plate. The first conductive layer and the second conductive layer are both in sheet form. The first conductive layer is attached to one side surface of the flexible core plate, and the second conductive layer is attached to the other side surface of the flexible core plate. The flexible winding 2 is also provided with a plurality of first insulating grooves and a plurality of second insulating grooves. The plurality of first insulating grooves are spaced on one side surface of the flexible winding 2, and the plurality of second insulating grooves are spaced on the other surface of the flexible winding 2. On one side surface of the flexible winding 2, the first conductive layer is missing at the position where the first insulating groove is located, so that the first conductive layer is separated into a plurality of first conductive lines by the plurality of first insulating grooves. On the other side surface of the flexible winding 2, the second conductive layer is missing at the position where the second insulating groove is located, so that the second conductive layer is separated into a plurality of second conductive lines by the plurality of second insulating grooves. Optionally, each first insulating groove is arranged opposite to a second insulating groove.

[0027] Each first conductive line is connected to a second conductive line to form a loop, and each loop serves as one turn of the coil of the flexible winding 2. This is the case for multiple groups of first and second conductive lines, such that a first layer winding L1 is formed on one side of the flexible core board, and a second layer winding L2 is formed on the other side of the flexible core board. Specifically, define the two side edges of the flexible core board distributed along the length direction of the first insulating groove as the first side edge and the second side edge respectively. A plurality of connection holes 12 are spaced along the length direction of the first side edge, and a plurality of connection holes 12 are spaced along the length direction of the second side edge. The opening positions of the connection holes 12 have the following situations: The connection hole 12 is a blind hole. The connection hole 12 penetrates the first conductive line and the flexible core board, but does not penetrate the second conductive line. A conductive filler is provided in the connection hole 12. The conductive filler can be carbon powder or a conductive metal coating. Connection holes 12 are provided at both ends of each first conductive line. At this time, the first conductive line and the second conductive line are connected at the connection hole 12 so that the first conductive line and the second conductive line in each group are interconnected to form a loop.

[0028] Alternatively, the connection hole 12 is a blind hole. A first connection hole 12 is provided at one end of the first conductive line. The first connection hole 12 penetrates the first conductive line and the flexible core board but does not penetrate the second conductive line. A second connection hole 12 is provided at the end of the second conductive line far from the first connection hole 12. The second connection hole 12 penetrates the second conductive line and the flexible core board but does not penetrate the first conductive line, so that the first conductive line and the second conductive line are connected at the first connection hole 12 and the second connection hole 12, so that the first conductive line and the second conductive line in each group are interconnected to form a loop.

[0029] Alternatively, the connection hole 12 is a through hole. At this time, the connection hole 12 penetrates both side plates of the flexible core board, and the connection hole 12 passes through the first conductive line and each second conductive line. At this time, the first conductive line and the second conductive line can be electrically connected at the connection hole 12 to achieve connection, so that the first conductive line and the second conductive line in each group are interconnected to form a loop.

[0030] Furthermore, both the first conductive layer and the second conductive layer are copper foils, and the thickness of the copper foil is preferably 1 Oz.

[0031] Further, after the grooving work of the first insulating groove and the second insulating groove is completed, the flexible winding 2 can be rolled up into a cylindrical shape, and can be used as the winding of a coreless motor. After the flexible winding 2 is rolled into a cylindrical shape, one of the first layer winding L1 and the second layer winding L2 is located on the outer wall surface of the cylindrical structure, and the other is located on the inner wall surface of the cylindrical structure. The annular loop formed by each group of the first conductive lines and the second conductive lines surrounds the inner and outer wall surfaces of the flexible core plate in a cylindrical shape, and each first conductive line is arranged back to back with a second conductive line.

[0032] Further, after the flexible winding 2 is rolled into a cylindrical shape, one end of the flexible winding 2 is the first end, and the other end is the second end. The part between the first end and the second end is the working part, and the working part includes two parts located on the inner wall surface and the outer wall surface of the flexible core plate.

[0033] Even further, as Figure 1 shown, the first end is provided with an incoming connection wire and an outgoing connection wire, and the number of the incoming connection wire and the number of the outgoing connection wire are related to the predetermined number of phases of the flexible winding 2. Specifically, taking the flexible winding 2 as a three-phase winding as an example, when the flexible winding 2 is an AC winding, the three phases are the A phase, the B phase, and the C phase respectively. The number of turns of each phase winding is 7 turns, and each phase winding is in a hexagonal shape. Of course, it is not limited thereto. For example, the number of turns of each phase winding can also be 9 turns, and each phase winding is in an octagonal shape. In addition, the number of flexible plate layers can be increased according to the current-carrying requirement, and the graphic winding remains unchanged. At the first end, the start end 6 of the A-phase winding, the end end 7 of the A-phase winding, the start end 8 of the B-phase winding, the end end 9 of the B-phase winding, the start end 10 of the C-phase winding, and the end end 11 of the C-phase winding are also led outwards.

[0034] As Figure 2 shown, when the flexible winding 2 is a DC winding, the three phases are the A phase, the B phase, and the C phase respectively. At this time, the first end of the flexible winding 2 leads out lead wire one 13, lead wire two 14, lead wire three 15, lead wire four 16, lead wire five 17, and lead wire six 18 outwards.

[0035] It can be seen that the flexible winding 2 provided by the present application, compared with the traditional winding method, significantly reduces the copper consumption at the winding end, reduces the copper loss, saves costs, improves the overall copper utilization rate of the flexible winding 2, and the setting position of the copper wire bundle is fixed. Compared with the traditional method of resin curing, it improves the uniformity of the winding wire width and wire pitch, optimizes the magnetic field distribution, reduces noise and vibration, and improves the output efficiency.

[0036] In a second aspect, an embodiment of the present application further provides a method for manufacturing a flexible winding, which is used to manufacture the flexible winding described in the above embodiment. Therefore, it has all the beneficial technical effects of the flexible winding, and will not be repeated here.

[0037] The method for manufacturing the flexible winding includes the following steps: S1. Blanking: Select a flexible core board, and conductive layers are respectively arranged on both side surfaces of the flexible core board.

[0038] Specifically, in the blanking stage, the flexible core board is preferably made of an insulating and flexible plate such as a PI or PET resin film, and copper foils are pasted on both side surfaces. It should be noted that an existing flexible pcb can be selected, that is, a flexible pcb has a structure with an insulating core layer in the middle and copper layers pasted on both sides. Preferably, the thickness of the copper foil is 1 Oz.

[0039] S2. Drilling: Open a plurality of connection holes 12 in the flexible core board.

[0040] Specifically, by means of laser drilling, appropriate positions are selected on the first side and the second side of the flexible core board to open the connection holes 12, and the drilling positions are the positions where the cross-section of the first winding L1 and the second winding L2 is located. Preferably, the diameter of the connection hole 12 is 0.1 mm. Since the depth of the connection hole 12 is small and it is difficult to process it into a through hole, the connection hole 12 in this embodiment is preferably a blind hole.

[0041] S3. Hole treatment: Perform black hole treatment or copper deposition treatment on the connection holes 12.

[0042] Specifically, perform black hole treatment on the connection holes 12. By filling carbon powder into the connection holes 12, the conductive sheets on both side surfaces of the flexible core board can be connected through the carbon powder at the connection holes 12. Preferably, the depth of the carbon powder accumulation in each connection hole 12 is 0.5 - 1 μm. Or, perform copper deposition treatment on the connection holes 12, and deposit a copper conductive layer on the hole walls of the connection holes 12 so that the conductive sheets on both side surfaces of the flexible core board can be connected through the carbon powder at the connection holes 12. Preferably, the copper deposition is 0.5 μm.

[0043] S4. Hole filling: Electroplate the connection holes 12 so that the two conductive layers are connected at the connection holes 12.

[0044] Specifically, perform VCP (vertical electroplating) on the flexible winding 2, and electroplate copper into the connection holes 12 so that the copper thickness at the bottom of the connection holes 12 can be designed according to the current carrying capacity, and can be but not limited to be greater than or equal to 10 μm.

[0045] S5. Film pasting: Cover dry films on the two conductive layers. The model selection of the dry film depends on the copper thickness and the etching line width during the hole filling process.

[0046] S6. Etching: Etch one side surface of the flexible winding 2 to form a plurality of first insulating grooves arranged at intervals, and etch the other side surface of the flexible winding 2 to form a plurality of second insulating grooves arranged at intervals.

[0047] Specifically, by means of etching, a plurality of first insulating grooves are formed at intervals on one side surface of the flexible winding 2, and a plurality of second insulating grooves are formed at intervals on the other side surface of the flexible winding 2. It should be noted that during etching, the unnecessary copper foil is etched away, and at least part of the thickness of the flexible core board is retained, and the copper foil at the retained position can form the first conductive line and the second conductive line. Preferably, the width of the etching line is 0.1 - 0.12 mm.

[0048] S7, Solder Mask: After etching is completed, the two side surfaces of the flexible core board are subjected to solder mask using ink.

[0049] Specifically, green ink is selected for the solder mask operation to form a protective layer on the two side surfaces of the flexible winding 2.

[0050] Preferably, the minimum thickness of the solder mask at the line corners is 5 μm, the minimum thickness of the solder mask on the line surfaces is 10 μm, and the minimum thickness of the solder mask at the substrate position is 15 μm.

[0051] S8, Protective Treatment: After the solder mask is completed, an anti - oxidation layer is deposited on the surfaces of the exposed first conductive line and the second conductive line.

[0052] Specifically, after the solder mask is completed, the ink on the surfaces of the first conductive line and the second conductive line is removed to expose the first conductive line and the second conductive line.

[0053] Then, an anti - oxidation layer is deposited on the surfaces of the first conductive line and the second conductive line. The anti - oxidation layer can be formed by processes such as tin immersion, silver immersion, gold immersion, and nickel - palladium - gold. When the anti - oxidation layer is a metal nickel layer, the minimum nickel thickness is 3μm and the maximum is 7μm; when the anti - oxidation layer is a metal gold layer, the minimum gold thickness is 0.05μm and the maximum is 0.1μm.

[0054] The method for manufacturing the flexible winding provided by this application obtains the flexible winding 2 by a method similar to processing a flexible pcb. The manufacturing process is mature, the yield is high, and it has a high processing efficiency.

[0055] In the third aspect, as shown in Figure 5 and Figure 6 This application's embodiment also provides a coreless motor, including the flexible winding described in the above - mentioned embodiment. Therefore, it has all the beneficial technical effects of this flexible winding and will not be elaborated here.

[0056] Furthermore, this coreless motor further includes: a housing 3, a permanent magnet 1, a main shaft, and a bearing 5. Among them, the main shaft passes through the housing 3, the main shaft is coaxially arranged with the housing 3, one end of the main shaft passes through the port of the housing 3 and extends outside the housing 3, the bearing 5 is arranged at the port of the housing 3, and the main shaft is connected to the bearing 5.

[0057] The permanent magnet 1 is arranged inside the casing 3. The permanent magnet 1 is cylindrical and is arranged around the main shaft.

[0058] The flexible winding 2 is arranged inside the casing 3. The flexible winding 2 is arranged between the inner wall surface of the casing 3 and the permanent magnet 1 and is arranged around the permanent magnet 1.

[0059] Furthermore, the cup rotor motor can be an AC cup rotor motor or a DC cup rotor motor. When the cup rotor motor is a DC cup rotor motor, a commutator 4 is further included and is arranged inside the casing 3.

[0060] For the cup rotor motor provided by this application, by using the flexible winding 2, the amount of copper used is effectively reduced, which is beneficial to cost control. Moreover, it is convenient to control the volume of the winding, can optimize the internal structure of the cup rotor motor, and is convenient to control the volume of the cup rotor motor.

[0061] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A flexible winding, characterized in that, Comprising: A flexible core board, the flexible core board having insulation; A first conductive layer, the first conductive layer being attached to one side surface of the flexible core board; A second conductive layer, the second conductive layer being attached to the other side surface of the flexible core board; A first insulating groove, the number of the first insulating grooves being multiple, the multiple first insulating grooves being spaced apart on one side surface of the flexible core board, and a first conductive line being formed between any two adjacent first insulating grooves; A second insulating groove, the number of the second insulating grooves being multiple, the multiple second insulating grooves being spaced apart on the other side surface of the flexible core board, and a second conductive line being formed between any two adjacent second insulating grooves; Each of the first conductive lines corresponds to and is connected to one of the second conductive lines.

2. The flexible winding according to claim 1, wherein, The flexible winding is provided with a plurality of connection holes, and each set of the first conductive line and the second conductive line is connected at one of the connection holes.

3. The flexible winding according to claim 1, wherein, Both the first conductive layer and the second conductive layer are copper foils.

4. The flexible winding according to claim 2, characterized in that, The connection hole is a blind hole, a conductive filler is provided in the connection hole, and each set of the first conductive line and the second conductive line is in contact with the conductive filler respectively.

5. The flexible winding according to claim 2, characterized in that, The connection hole is a through hole, and each set of the first conductive line and the second conductive line is electrically connected at the connection hole.

6. The flexible winding according to claim 1, wherein The flexible winding can be surrounded to form a cylindrical shape, and the flexible winding in the cylindrical shape includes a first end portion, a second end portion and a working portion; The first end portion is provided with an incoming wire and an outgoing wire.

7. A method for manufacturing a flexible winding, characterized in that, For manufacturing the flexible winding according to any one of claims 1 to 6, the method for manufacturing the flexible winding includes the steps of: S1. Blanking: Select a flexible core board, with conductive layers provided on both sides of the flexible core board; S2. Drilling: Drill a plurality of connection holes in the flexible core board; S3. Hole treatment: Perform black hole treatment or copper deposition treatment on the connection holes; S4. Hole filling: Electroplate the connection holes to connect the two conductive layers at the connection holes; S5. Film pasting: Cover a dry film on the conductive layer; S6. Etching: Etch a plurality of the first insulating grooves on one side surface of the flexible winding, and etch a plurality of the second insulating grooves on the other side surface of the flexible winding; S7. Solder resist: After etching, use ink to perform solder resist on both side surfaces of the flexible core board; S8. Protection treatment: Deposit an anti-oxidation layer on the surfaces of the exposed first conductive lines and the second conductive lines after the solder resist is completed.

8. The method for manufacturing a flexible winding according to claim 7, wherein In step S3, when performing black hole treatment on the connection holes, carbon powder is filled into the connection holes, and the carbon powder accumulates 0.5 - 1 μm; or when performing copper deposition treatment on the connection holes, the copper deposition is 0.5 μm.

9. A coreless motor, characterized in that, Comprising the flexible winding according to any one of claims 1 to 6, the coreless motor further includes: A housing, the flexible winding being disposed inside the housing; A permanent magnet, the permanent magnet being disposed inside the housing; A main shaft, the main shaft passing through the flexible winding; A bearing, one end of the main shaft being connected to the bearing.

10. The cup motor according to claim 9, wherein, The coreless motor further includes a commutator, the commutator being disposed inside the housing.

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