Inner peripheral shielding conductive device and jig for electrostatic powder coating of motor core

Abstract

The utility model relates to motor manufacturing field discloses a kind of inner circumferential shielding conductive device and motor core electrostatic powder coating jigs, inner circumferential shielding conductive device is used for motor core electrostatic powder coating, motor core includes yoke part and a plurality of circumferentially spaced tooth parts, tooth part extends radially from the yoke part inner circumferential surface of yoke part, every tooth part includes tooth part inner circumferential surface;Inner circumferential shielding conductive device includes inner circumferential shielding component and conductive component;Inner circumferential shielding component is made of insulating material, is located tooth part inner circumferential surface to shield the tooth part of tooth part inner circumferential surface;Conductive component is electrically connected motor core.Inner circumferential shielding component shields tooth part inner circumferential surface can avoid tooth part inner circumferential surface and insulating powder contact when powdering, avoid tooth part inner circumferential surface coating insulating powder.Motor core does not need to split into core unit to assemble inner circumferential shielding conductive device, can solve the problem of low powdering efficiency caused by that core needs to split into core unit before clamping in prior art.

Description

Technical Field

[0001] This utility model relates to the field of motor manufacturing, and in particular to an inner circumferential shielding conductive device and a jig for electrostatic powder coating of motor core. Background Technology

[0002] The iron core of an electric motor typically needs to be coated with insulating powder on the contact surfaces with the coil windings to insulate them. Generally, for iron cores with external teeth, clamps are used to hold the core at both ends, and then the clamps and the clamped core are placed in an electrostatic precipitator for powder coating. However, this method is not suitable for iron cores with internal teeth, as it easily leads to insulating powder adhering to the outer circumference of the yoke and the end faces of the teeth, thus affecting the use of the iron core.

[0003] Currently, for iron cores with internal teeth, the core is generally pre-disassembled into several core units, which are then clamped using a special fixture. After being clamped in the fixture, the core units are coated with powder. The process of disassembling and assembling the iron core is cumbersome, and the fixture may not be able to clamp all the core units of a complete iron core at one time, resulting in low powder coating efficiency. Utility Model Content

[0004] The present invention aims to provide an inner circumferential shielding conductive device and a jig for electrostatic powder coating of motor iron core, so as to solve the technical problem of low powder coating efficiency caused by the need to disassemble the iron core into iron core units before clamping in the prior art.

[0005] The present invention solves its technical problem by adopting the following technical solution: providing an inner circumferential shielding conductive device for electrostatic powder coating of a motor core, wherein the motor core includes a yoke and a plurality of circumferentially spaced teeth, the teeth extending radially from the inner circumferential surface of the yoke, and each tooth including an inner circumferential surface; the inner circumferential shielding conductive device includes an inner circumferential shielding component and a conductive component; the inner circumferential shielding component is made of insulating material and is disposed on the inner circumference of the teeth to shield the inner circumferential surface of the teeth; the conductive component is electrically connected to the motor core.

[0006] In some embodiments, the inner circumferential shielding assembly includes a shielding main body and a plurality of circumferentially spaced positioning protrusions; the positioning protrusions protrude from the outer circumference of the shielding main body, and each positioning protrusion extends into the gap between two adjacent teeth; the shielding main body is disposed on the inner circumference of the teeth and forms a shielding surface with the positioning protrusions that is in close contact with the inner circumferential surface of the teeth.

[0007] In some embodiments, the conductive component includes a support shaft and a conductive connector. The shielding body is fitted around the outer periphery of the support shaft, and the conductive connector is embedded within the shielding body. One end of the conductive connector is conductively connected to the support shaft, and the other end is conductively connected to the inner circumferential surface of the tooth.

[0008] In some cases, the shielding body has a first through hole and a second through hole; the first through hole passes through both ends of the shielding body, and the support shaft passes through the first through hole; the second through hole extends from the side of the shielding body to communicate with the first through hole, and the conductive connector is housed in the second through hole, with one end of the conductive connector contacting the support shaft and the other end contacting the inner circumferential surface of the tooth.

[0009] In some embodiments, the support shaft includes a first shaft portion, a first sleeve portion, a first threaded portion, a second shaft portion, and a second threaded portion; the first shaft portion and the second shaft portion clamp the shielding main body portion; the first threaded portion is located on the side of the first shaft portion near the shielding main body portion; the second threaded portion is located on the side of the second shaft portion near the shielding main body portion; the first threaded portion and the second threaded portion are threaded together; the first sleeve portion is connected between the first shaft portion and the first threaded portion; and the first sleeve portion extends into the first through hole.

[0010] In some embodiments, the support shaft further includes a second sleeve portion; the second sleeve portion is connected between the second shaft portion and the second threaded portion, and the first sleeve portion and the second sleeve portion extend into the first through hole from openings on both sides of the first through hole.

[0011] In some embodiments, the inner peripheral shielding assembly further includes a limiting protrusion; the limiting protrusion protrudes from the outer periphery of the shielding body portion and is located on the radial side of the tooth portion to abut against the tooth portion.

[0012] In some cases, the shielding body is cylindrical, with the first through hole axially penetrating the shielding body and the second through hole radially penetrating the shielding body.

[0013] In some cases, the conductive connectors are of several kinds, and the second through holes are of several kinds;

[0014] Each of the conductive connectors is housed in a corresponding second through hole, one end of each conductive connector is conductively connected to the support shaft, and the other end of each conductive connector is conductively connected to the inner circumferential surface of a corresponding tooth.

[0015] The present invention solves its technical problem by adopting the following technical solution: providing a jig for electrostatic powder coating of motor core, the jig including an outer peripheral shielding component and an inner peripheral shielding conductive device as described above; the outer peripheral shielding component shields the outer peripheral surface of the yoke, and the outer peripheral shielding component and the inner peripheral shielding conductive device are spaced apart to expose the tooth sidewall of the tooth.

[0016] Compared with existing technologies, this utility model provides an inner circumferential shielding conductive device and a fixture for electrostatic powder coating of motor cores. The inner circumferential shielding conductive device, after assembling the motor core, shields the inner circumferential surface of the teeth, preventing contact between the inner circumferential surface of the teeth and the insulating powder during powder coating, thus avoiding the coating of insulating powder onto the inner circumferential surface of the teeth. The motor core does not need to be disassembled into core units before assembling the inner circumferential shielding conductive device, thereby solving the technical problem of low powder coating efficiency caused by the need to disassemble the core into core units before clamping in existing technologies.

[0017] Furthermore, after the conductive component is electrically connected to the electrostatic generator, the motor core is also electrically connected to the electrostatic generator through the conductive component, causing the motor core to become charged. During powder coating, the motor core can attract the light insulating powder, which is easily attracted to the motor core, resulting in high powder coating efficiency. The insulating inner circumferential shielding component avoids carrying a charge, thus preventing it from competing with the motor core for insulating powder. The insulating powder can be concentrated and attracted by the motor core, ensuring efficient contact between the insulating powder and the motor core, and reducing the difficulty of cleaning the inner circumferential shielding conductive device later. Attached Figure Description

[0018] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0019] Figure 1 This is a structural schematic diagram of the assembly of the motor core and the fixture provided in one embodiment of the present invention;

[0020] Figure 2 yes Figure 1 A disassembly diagram of the assembly shown;

[0021] Figure 3 yes Figure 1 A disassembly diagram of the assembly shown from another angle;

[0022] Figure 4 yes Figure 1 A schematic diagram of the motor core structure of the assembly shown;

[0023] Figure 5 yes Figure 1 The diagram shows the structure of the motor core of the assembly after it has been coated with insulating powder. The shaded areas of the motor core are coated with insulating powder, while the unshaded areas are not coated with insulating powder.

[0024] Figure 6 yes Figure 1 A schematic diagram of the structure of the first cover of the assembly shown;

[0025] Figure 7 yes Figure 1 A schematic diagram of the structure of the second cover of the assembly shown;

[0026] Figure 8 yes Figure 1 The diagram shows the internal structure of the motor core and the outer shielding assembly in the assembled state.

[0027] Figure 9 yes Figure 1 A schematic diagram of the inner circumferential shielding component in the assembly shown;

[0028] Figure 10 yes Figure 1 The diagram shows the internal structure of the assembly.

[0029] Figure 11 yes Figure 1 A schematic diagram of the internal structure of the assembly shown from another angle;

[0030] Figure 12 yes Figure 11 A magnified view of a portion of point I shown;

[0031] Figure 13 This is a schematic diagram of the support shaft of the fixture in some embodiments;

[0032] Figure 14 This is a schematic diagram of the conductive connector of the fixture in some embodiments;

[0033] Figure 15 yes Figure 13 A schematic diagram of the structure of the first clamping member of the support shaft shown;

[0034] Figure 16 yes Figure 13 A schematic diagram of the structure of the second clamping member of the support shaft is shown;

[0035] Figure 17 yes Figure 16 The diagram shows the internal structure of the second clamping member.

[0036] Figure 18 This is a schematic diagram of the internal structure of the motor core and fixture in some embodiments, wherein the two ends of the support shaft are omitted;

[0037] Figure 19 This is a schematic diagram of the internal structure of the motor core and fixture in some other embodiments, wherein the two ends of the support shaft are omitted;

[0038] Figure 20 This is a schematic diagram of the internal structure of the motor core and fixture when placed in an electrostatic generator in some embodiments, showing only a portion of the electrostatic generator's structure.

[0039] Figure 21 This is a flowchart illustrating a method for electrostatic powder coating of a motor core according to another embodiment of the present invention;

[0040] Figure 22 yes Figure 21 The flowchart shows the specific steps involved in fitting the outer peripheral shielding component onto the outer periphery of the motor core. Detailed Implementation

[0041] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as "connected" to another element, it can be directly on the other element, or one or more intermediate elements may exist between them. The terms "upper," "lower," "left," "right," "upper end," "lower end," "top," and "bottom," etc., used in this specification, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention.

[0043] Please see Figures 1 to 5 One embodiment of this utility model provides a fixture 100 for electrostatic powder coating of a motor core 200. The motor core 200 can be a one-piece structure or assembled from several core units. The motor core 200 includes a yoke 202 and several circumferentially spaced teeth 204. The yoke 202 is generally annular and includes two yoke end faces 2020, an inner yoke circumferential surface 2024, and an outer yoke circumferential surface 2026. The two yoke end faces 2020 are arranged opposite to each other, and the outer yoke circumferential surface 2026 surrounds the inner yoke circumferential surface 2024, with the outer yoke circumferential surface 2026 and the inner yoke circumferential surface 2024 located between the two yoke end faces 2020. The tooth portion 204 extends radially from the inner circumferential surface 2024 of the yoke portion. Each tooth portion 204 includes an inner circumferential surface 2040 and a sidewall 2042, with the sidewall 2042 connecting the inner circumferential surface 2040 and the inner circumferential surface 2024 of the yoke portion. The sidewall 2042 contacts the coil winding when the motor core 200 is wound with the coil winding.

[0044] In this application, the example is taken as the assembly of the jig 100 and the motor core 200.

[0045] The fixture 100 includes an outer peripheral shielding assembly 10 and an inner peripheral shielding conductive device. The outer peripheral shielding assembly 10 is fitted around the outer periphery of the yoke 202 to shield the outer peripheral surface 2026 of the yoke 202. The inner peripheral shielding conductive device is fitted around the inner periphery of the tooth 204 to shield the inner peripheral surface 2040 of the tooth 204. The outer peripheral shielding assembly 10 and the inner peripheral shielding conductive device are spaced apart to expose the tooth sidewall 2042 of the tooth 204. The outer peripheral shielding component 10 shields the outer peripheral surface 2026 of the yoke, which can isolate the outer peripheral surface 2026 of the yoke from the insulating powder when the motor core 200 is coated with powder, thus preventing the outer peripheral surface 2026 of the yoke from being coated with insulating powder; the inner peripheral shielding conductive device shields the inner peripheral surface 2040 of the tooth, which can isolate the inner peripheral surface 2040 of the tooth from the insulating powder when the motor core 200 is coated with powder, thus preventing the inner peripheral surface 2040 of the tooth from being coated with insulating powder; the exposed tooth sidewall 2042 can come into contact with the insulating powder when the motor core 200 is coated with powder, so that the insulating powder is coated on the tooth sidewall 2042.

[0046] The fixture 100 can assemble a complete motor core 200. After assembling the complete motor core 200, the fixture 100 can cover the inner circumferential surface 2040 of the teeth and the outer circumferential surface 2026 of the yoke of the motor core 200, exposing the sidewall 2042 of the teeth. During the powder coating operation, the motor core 200 only needs to be assembled with the fixture 100 once, and the entire sidewall 2042 of the teeth can be coated with insulating powder in a single application. Because a complete motor core 200 can be assembled, the cumbersome process of disassembling and assembling the motor core 200 is eliminated, improving the powder coating efficiency of the motor core 200. This facilitates large-scale automated powder coating operations of the motor core 200 and solves the technical problem of low powder coating efficiency caused by the current requirement to disassemble the core into core units before clamping.

[0047] The inner circumferential shielding conductive device includes an inner circumferential shielding component 20 and a conductive component.

[0048] The inner circumferential shielding component 20 is fitted onto the inner circumference of the tooth 204 to shield the inner circumferential surface 2040 of the tooth. The inner circumferential shielding component 20 is spaced apart from the outer circumferential shielding component 10 to expose the sidewall 2042 of the tooth.

[0049] It is understood that the peripheral shielding component 10 is not limited to a structure that can be fitted onto the outer periphery of the yoke 202. In some other embodiments, the peripheral shielding component 10 can be adhesive tape, which is adhered to the outer peripheral surface 2026 of the yoke to cover and thus shield the outer peripheral surface 2026 of the yoke. Depending on actual needs, the peripheral shielding component 10 can be designed with any shape, as long as it is positioned on the outer periphery of the yoke 202 and can shield the outer peripheral surface 2026 of the yoke.

[0050] The conductive component can be made of conductive materials such as copper, aluminum, and graphite. The conductive component is conductively connected to the motor core 200. Specifically, the conductive component is used to conductively connect to the electrostatic generator, allowing the motor core 200 to be conductively connected to the electrostatic generator through the conductive component. This causes the motor core 200 to become charged. Once charged, the motor core 200 can attract fine insulating powder, thereby improving the contact efficiency between the insulating powder and the tooth sidewall 2042, increasing powder coating efficiency, and shortening the powder coating time.

[0051] The insulating powder used for coating can carry an electric charge. The polarity of the charge carried by the insulating powder is opposite to that of the charge carried by the motor core 200, which can further improve the ability of the motor core 200 to adsorb the insulating powder.

[0052] The outer peripheral shielding component 10 and the inner peripheral shielding component 20 can be made of insulating materials, such as Teflon, rubber, or silicone. This prevents the outer peripheral shielding component 10 and the inner peripheral shielding component 20 from carrying a charge, thus preventing them from adsorbing insulating powder. On the one hand, this avoids competition with the motor core 200 for insulating powder; the insulating powder will only be concentrated and adsorbed by the tooth sidewall 2042, and will not be adsorbed by the inner peripheral shielding component 20 and the outer peripheral shielding component 10, ensuring that the contact efficiency between the insulating powder and the tooth sidewall 2042 is not reduced. On the other hand, since the inner peripheral shielding component 20 and the outer peripheral shielding component 10 do not adsorb insulating powder, the workload of cleaning the inner peripheral shielding component 20 and the outer peripheral shielding component 10 can be reduced later.

[0053] Please refer to the following: Figures 6 to 8 The outer peripheral shielding assembly 10 includes a first cover 12 and a second cover 14. The first cover 12 includes a first sidewall 120 and a first limiting flange 122. The first sidewall 120 is fitted around the outer periphery of the yoke 202, shielding the outer peripheral surface 2026 of the yoke. The first limiting flange 122 extends from one periphery of the first sidewall 120 toward the inner peripheral shielding assembly 20, and the first limiting flange 122 fits against one end face 2020 of the yoke 202. The first limiting flange 122 surrounds the inner peripheral shielding conductive device and is spaced apart from the inner peripheral shielding conductive device. Specifically, the first limiting flange 122 surrounds the inner peripheral shielding assembly 20 and is spaced apart from the inner peripheral shielding assembly 20, exposing the toothed sidewall 2042.

[0054] The first limiting flange 122 is attached to the yoke end face 2020. In a first aspect, the first limiting flange 122 serves a limiting function. When the first cover 12 is assembled with the motor core 200, the motor core 200 is inserted axially into the first sidewall 120 until the yoke end face 2020 of the yoke 202 is attached to the first limiting flange 122, at which point the motor core 200 is fully inserted. In a second aspect, the first limiting flange 122 can at least partially cover the yoke end face 2020, so that during powder coating, the covered portion of the yoke end face 2020 is isolated from the insulating powder, preventing the covered portion from being coated with insulating powder, and allowing the uncovered portion of the yoke end face 2020 to contact the insulating powder, thus coating the uncovered portion with insulating powder. By designing the inner diameter of the first limiting flange 122, the size of the portion of the yoke end face 2020 that is covered can be adjusted. In this embodiment, the inner diameter of the first limiting flange 122 is slightly larger than the inner diameter of the yoke 202. The first limiting flange 122 covers the outer ring portion of the yoke end face 2020. When the motor core 200 is powder coated, the outer ring portion of the yoke end face 2020 will not be coated with insulating powder, while the inner ring portion can be coated with insulating powder. Figure 5 As shown. Depending on actual needs, the inner diameter of the first limiting flange 122 can be less than or equal to the inner diameter of the yoke 202, so that the first limiting flange 122 can completely cover the end face 2020 of the yoke, and the entire end face 2020 of the yoke will not be coated with insulating powder. Depending on actual needs, the first limiting flange 122 can also be omitted to expose the entire end face 2020 of the yoke, allowing the entire end face 2020 of the yoke to be coated with insulating powder. Thirdly, the fit between the first limiting flange 122 and the end face 2020 of the yoke can cover the gap between the outer peripheral surface 2026 of the yoke and the first sidewall 120, making it difficult for insulating powder to pass through this gap and contact the outer peripheral surface 2026 of the yoke, thus improving the yield rate.

[0055] The second cover 14 includes a second side circumference 140 and a second limiting flange 142.

[0056] The second limiting flange 142 is located on the side of the first sidewall 120 away from the first limiting flange 122. The second limiting flange 142 abuts the yoke end face 2020 of the yoke portion 202 away from the first limiting flange 122. The second limiting flange 142 surrounds the inner circumferential shielding conductive device and is spaced apart from the inner circumferential shielding conductive device. Specifically, the second limiting flange 142 surrounds the inner circumferential shielding assembly 20 and is spaced apart from the inner circumferential shielding assembly 20.

[0057] The second side panel 140 is fitted around the outer periphery of the first side panel 120. The inner diameter of the second side panel 140 can be slightly smaller than the outer diameter of the first side panel 120, so that the first side panel 120 and the second side panel 140 are interference-fitted, thereby fixing the second cover 14 to the first cover 12. After the powder coating operation of the motor core 200 is completed, the assembly of the first cover 12 and the motor core 200 can be pried out of the second cover 14 by hand, which is convenient for disassembly and assembly and improves the powder coating efficiency. The second side panel 140 extends towards the inner periphery of the conductive device away from the first limiting flange 122, specifically, the second side panel 140 extends towards the inner periphery of the shielding assembly 20 away from the first limiting flange 122.

[0058] The second limiting flange 142 fits against the end face 2020 of the yoke. In the first aspect, the second limiting flange 142 can play a limiting role. When the second cover 14 is assembled with the assembly of the first cover 12 and the motor core 200, the assembly of the first cover 12 and the motor core 200 is inserted axially into the second side wall 140 until the other end face 2020 of the yoke 202, which is away from the first limiting flange 122, fits against the second limiting flange 142. At this time, the assembly of the first cover 12 and the motor core 200 is inserted into place. Secondly, the second limiting flange 142 can at least partially cover the yoke end face 2020, so that the covered part of the yoke end face 2020 is isolated from the insulating powder during powder coating, preventing the covered part of the yoke end face 2020 from being coated with insulating powder, and allowing the uncovered part of the yoke end face 2020 to come into contact with the insulating powder, thus coating the uncovered part of the yoke end face 2020 with insulating powder. By designing the inner diameter of the second limiting flange 142, the size of the covered part of the yoke end face 2020 can be adjusted. In this embodiment, the inner diameter of the second limiting flange 142 is slightly larger than the inner diameter of the yoke 202. The second limiting flange 142 covers the outer ring part of the yoke end face 2020. When the motor core 200 is powder coated, the outer ring part of the yoke end face 2020 will not be coated with insulating powder, while the inner ring part of the yoke end face 2020 can be coated with insulating powder. Figure 5 As shown. Depending on actual needs, the inner diameter of the second limiting flange 142 can also be less than or equal to the inner diameter of the yoke 202, so that the second limiting flange 142 can completely cover the end face 2020 of the yoke, and the entire end face 2020 of the yoke will not be coated with insulating powder. Depending on actual needs, the second limiting flange 142 can also be omitted to expose the entire end face 2020 of the yoke, allowing the entire end face 2020 of the yoke to be coated with insulating powder. Thirdly, the fit between the second limiting flange 142 and the end face 2020 of the yoke can cover the gap between the outer peripheral surface 2026 of the yoke and the first sidewall 120, making it difficult for insulating powder to pass through this gap and contact the outer peripheral surface 2026 of the yoke, thus improving the yield rate.

[0059] It is understandable that the second side panel 140 may be omitted depending on actual needs. In some other embodiments, the second cover 14 includes a second limiting flange 142, which is detachably fixed to the side of the first side panel 120 away from the first limiting flange 122. The second limiting flange 142 fits against the other end face 2020 of the yoke portion 202 away from the first limiting flange 122. Specifically, the second limiting flange 142 can be connected to the first side panel 120 by means of snap-fit, adhesive, etc.

[0060] The inner diameter of the first sidewall 120 can be slightly larger than the outer diameter of the yoke 202. The first sidewall 120 and the yoke 202 are fitted with a clearance, allowing the motor core 200 to be easily inserted into or removed from the first sidewall 120. This facilitates easy assembly and disassembly, saving time on the jig 100 and the motor core 200, and is beneficial for large-scale automated powder coating operations on the motor core 200. Since the first limiting flange 122 and the second limiting flange 142 respectively abut against the two yoke end faces 2020 of the yoke 202, they can block insulating powder during powder coating, preventing insulating powder from entering the gap between the first sidewall 120 and the outer peripheral surface 2026 of the yoke, thereby preventing the outer peripheral surface 2026 of the yoke from being coated with insulating powder.

[0061] Please refer to the following: Figures 9 to 12 The inner peripheral shielding assembly 20 includes a shielding main body 22, a positioning protrusion 24, and a limiting protrusion 26. The outer peripheral shielding assembly 10 is spaced apart from the shielding main body 22. Specifically, a first limiting flange 122 surrounds the shielding main body 22 and is spaced apart from it, and a second limiting flange 142 surrounds the shielding main body 22 and is spaced apart from it. The shielding main body 22 is generally cylindrical and is fitted onto the inner periphery of the toothed portion 204. The outer diameter of the shielding body 22 can be slightly smaller than the inner diameter of the tooth 204 so that the shielding body 22 and the tooth 204 are interference-fitted, so that the inner peripheral shielding component 20 is fixed to the motor core 200. After the powder coating operation of the motor core 200 is completed, the inner peripheral shielding component 20 can be pried out by hand from the motor core 200 or the assembly with the outer peripheral shielding component 10, which is convenient for disassembly and assembly and improves the powder coating efficiency.

[0062] The positioning protrusions 24 are numerous and arranged circumferentially at intervals. The positioning protrusions 24 protrude from the outer periphery of the shielding main body 22, and each positioning protrusion 24 extends into the gap between two adjacent teeth 204. The positioning protrusions 24 can keep the inner circumferential shielding assembly 20 and the motor core 200 fixed in the circumferential direction, so that the inner circumferential shielding assembly 20 and the motor core 200 will not rotate relative to each other.

[0063] The shielding body 22 and the positioning protrusion 24 form a shielding surface that is in close contact with the inner peripheral surface 2040 of the tooth. The inner peripheral surface 2040 of each tooth 204 is located between two adjacent positioning protrusions 24. These two positioning protrusions 24 can block the circumferential insulating powder from the inner peripheral surface 2040 of the tooth, further preventing the inner peripheral surface 2040 of the tooth from contacting the insulating powder.

[0064] A limiting protrusion 26 protrudes from the outer periphery of the shielding main body 22. The limiting protrusion 26 is located near one end of the shielding main body 22 and away from the other end. The limiting protrusion 26 is located on the radial side of the tooth 204 and abuts against the tooth 204. When the inner peripheral shielding assembly 20 is inserted axially into the motor core 200 or the combination of the motor core 200 and the outer peripheral shielding assembly 10, the limiting protrusion 26 can abut against the side wall 2042 of the tooth, playing a limiting role and preventing the shielding main body 22 from being inserted further. At this time, the inner peripheral shielding assembly 20 is inserted into place.

[0065] The shielding main body 22 has a first through hole 220 and a second through hole 222. The first through hole 220 passes through both ends of the shielding main body 22, and the second through hole 222 extends from the side of the shielding main body 22 to communicate with the first through hole 220. There are a plurality of second through holes 222, the number of which corresponds to the number of teeth 204, and each second through hole 222 is aligned with a corresponding tooth 204.

[0066] The first through hole 220 can axially penetrate the shielding body 22, and the second through hole 222 can radially penetrate the shielding body 22.

[0067] Please refer to the following: Figures 13 to 18 The conductive component has an axis, which is substantially coincident with the axis of the motor core 200. The conductive component can cooperate with the transmission mechanism of the electrostatic generator to drive the motor core 200 to rotate. When the motor core 200 is coated with powder, the rotation of the motor core 200 allows the tooth sidewall 2042 to fully contact the insulating powder, so that the insulating powder is evenly coated on the tooth sidewall 2042.

[0068] The conductive component may include a support shaft 30 and a conductive connector 40. A shielding body 22 is fitted around the outer periphery of the portion between the two ends of the support shaft 30; specifically, the portion between the two ends of the support shaft 30 passes through a first through hole 220. The electrostatic generator may have two transmission mechanisms, arranged opposite to each other, with the two ends of the support shaft 30 respectively positioned on the two transmission mechanisms. The transmission mechanism may be a screw, which cooperates with the support shaft 30. When the screw rotates, it can move the assembly of the fixture 100 and the motor core 200, and simultaneously rotate the assembly. One end of the support shaft 30 is used for conductive connection to the ground wire of the electrostatic generator. The conductive connector 40 is embedded within the inner periphery shielding component 20; specifically, the conductive connector 40 is embedded within the shielding body 22. The conductive connectors 40 are numerous, corresponding to the number of second through holes 222. Each conductive connector 40 is housed within a corresponding second through hole 222. One end of each conductive connector 40 is conductively connected to the support shaft 30, and the other end is conductively connected to a corresponding tooth 204. After the support shaft 30 contacts the ground wire of the electrostatic generator, the ground wire, support shaft 30, conductive connectors 40, and motor core 200 are sequentially conductively connected. The outer diameter of the conductive connector 40 can be slightly larger than the inner diameter of the second through hole 222, so that the conductive connector 40 and the shielding body 22 are interference-fitted, thereby fixing the conductive connector 40 to the inner peripheral shielding assembly 20. Furthermore, the conductive connector 40 being embedded in the shielding body 22 avoids contact with insulating powder, thus preventing the conductive connector 40 from adsorbing insulating powder when it is charged.

[0069] It is understood that the conductive connector 40 and the inner circumferential shielding component 20 are not limited to being fixed by an interference fit. Depending on actual needs, the conductive connector 40 can also be fixed to the inner circumferential shielding component 20 by means such as adhesive or snap-fit. This application does not limit this.

[0070] The support shaft 30 may include a first clamping member 32 and a second clamping member 34. One end of the first clamping member 32 is close to the inner circumferential shielding component 20, and the other end is away from the inner circumferential shielding component 20. One end of the second clamping member 34 is close to the inner circumferential shielding component 20, and the other end is away from the inner circumferential shielding component 20. The end of the first clamping member 32 away from the inner circumferential shielding component 20 is used to clamp the inner circumferential shielding component 20. The other end of the first clamping member 32 away from the inner circumferential shielding component 20 is used to rest on one of the conveying mechanisms of the electrostatic generator, and the other end of the second clamping member 34 away from the inner circumferential shielding component 20 is used to rest on another conveying mechanism of the electrostatic generator.

[0071] The first clamping member 32 includes a first shaft portion 320, a first sleeve portion 322, and a first threaded portion 324. The second clamping member 34 includes a second shaft portion 340, a second sleeve portion 342, and a second threaded portion 344.

[0072] One end of the first shaft portion 320 is close to the shielding main body portion 22, and the other end is away from the shielding main body portion 22. One end of the second shaft portion 340 is close to the shielding main body portion 22, and the other end is away from the shielding main body portion 22. The end of the first shaft portion 320 close to the shielding main body portion 22 abuts against one end of the shielding main body portion 22, and the end of the second shaft portion 340 close to the shielding main body portion 22 abuts against the other end of the shielding main body portion 22. The first shaft portion 320 and the second shaft portion 340 clamp the shielding main body portion 22. The end of the first shaft portion 320 away from the shielding main body portion 22 is used to rest on one of the conveying mechanisms of the electrostatic generator, and the other end of the second shaft portion 340 away from the shielding main body portion 22 is used to rest on another conveying mechanism of the electrostatic generator. A first threaded portion 324 is located on the side of the first shaft portion 320 near the shielding main body portion 22, and a second threaded portion 344 is located on the side of the second shaft portion 340 near the shielding main body portion 22. The first threaded portion 324 and the second threaded portion 344 are threaded together to fix the first clamping member 32 and the second clamping member 34. A first sleeve portion 322 is connected between the first shaft portion 320 and the first threaded portion 324, and a second sleeve portion 342 is connected between the second shaft portion 340 and the second threaded portion 344. The first sleeve portion 322 and the second sleeve portion 342 extend into the first through hole 220 from openings on both sides of the first through hole 220, respectively.

[0073] It is understandable that, depending on actual needs, either the first socket portion 322 or the second socket portion 342 may be omitted. In some other embodiments, the first clamping member 32 includes a first shaft portion 320, a socket portion 326, and a first threaded portion 324, and the second clamping member 34 includes a second shaft portion 340 and a second threaded portion 344. The socket portion 326 protrudes from the end of the first shaft portion 320 near the shielding body portion 22, and is inserted into the first through hole 220. The first threaded portion 324 is located on the side of the socket portion 326 away from the first shaft portion 320, and the second threaded portion 344 is located at the end of the second shaft portion 340 near the shielding body portion 22. The first threaded portion 324 and the second threaded portion 344 are threaded together, such as... Figure 19 As shown.

[0074] It is understandable that, depending on actual needs, the first clamping member 32 and the second clamping member 34 are not limited to being fixed by screws. In some other embodiments, the first clamping member 32 and the second clamping member 34 can also be fixed by snap-fit.

[0075] Please refer to the following: Figure 20The other end of the first shaft portion 320 away from the shielding main body portion 22 is rounded to form an arc surface structure 3200. The arc surface structure 3200 can fit the cross-sectional shape of the ground wire 304 of the electrostatic generator to ensure that the fixture 100 and the assembled motor core 200 are transported stably on the conveying mechanism 302, while ensuring that the support shaft 30 and the ground wire 304 maintain stable contact. The motor core 200 can continuously carry a charge, thereby continuously adsorbing insulating powder.

[0076] Understandably, depending on actual needs, the curved surface structure 3200 can also be formed on the other end of the second shaft portion 340 away from the shielding main body portion 22.

[0077] The process of assembling the jig 100 with the motor core 200 to form an assembly of the jig 100 and the motor core 200 is roughly as follows:

[0078] The outer peripheral shielding assembly 10 is assembled with the motor core 200. The motor core 200 is inserted axially into the first side panel 120 until the end face 2020 of the yoke portion of the motor core 200 is in contact with the first limiting flange 122. At this point, the motor core 200 and the first cover 12 are assembled in place, forming an assembly of the first cover 12 and the motor core 200. This assembly is then inserted axially into the second side panel 140 until the second limiting flange 142 is in contact with the other end face 2020 of the yoke portion of the motor core 200 away from the first limiting flange 122. At this point, the motor core 200 and the outer peripheral shielding assembly 10 are assembled in place.

[0079] The inner circumferential shielding conductive device is assembled with the motor core 200. Each positioning protrusion 24 is aligned with the gap between two adjacent teeth 204. The shielding body 22 is inserted axially into the inner circumference of the teeth 204 until the limiting protrusion 26 abuts against the side wall 2042 of the teeth. Each conductive connector 40 contacts the inner circumferential surface 2040 of a corresponding tooth 204. The motor core 200 and the inner circumferential shielding assembly 20 are then assembled in place.

[0080] It should be noted that the motor core 200 can be assembled with the outer peripheral shielding component 10 first and then with the inner peripheral shielding component 20, or it can be assembled with the inner peripheral shielding component 20 first and then with the outer peripheral shielding component 10. This application does not impose any restrictions on this.

[0081] The assembly of fixture 100 and motor core 200 can be powder coated in an electrostatic gel, and the process is roughly as follows:

[0082] The two ends of the support shaft 30 rest on the two conveying mechanisms of the electrostatic generator, and the arc-shaped structure 3200 is in contact with the ground wire of the electrostatic generator. The conveying mechanism transports the assembly of the fixture 100 and the motor core 200 to the powder coating area of ​​the electrostatic generator. During this process, the ground wire is electrically connected to the motor core 200 through the support shaft 30 and the conductive connector 40, causing the motor core 200 to carry a charge. When the motor core 200 is transported to the powder coating area, the electrostatic generator can spray insulating powder onto the motor core 200. The polarity of the charge carried by the insulating powder is opposite to that carried by the motor core 200. The insulating powder is adsorbed onto the tooth sidewall 2042, forming an insulating layer on the tooth sidewall 2042.

[0083] Please see Figure 21 Another embodiment of this utility model provides an electrostatic powder coating method S400 for an electric motor core, wherein the electric motor core is assembled using the fixture described in the foregoing embodiment.

[0084] The motor core includes a yoke and several circumferentially spaced teeth that extend radially from the inner circumferential surface of the yoke.

[0085] The method includes the following steps:

[0086] Step S402: Provide a jig for electrostatic powder coating of motor core, the jig including an outer peripheral shielding component and an inner peripheral shielding component;

[0087] Step S404: The outer peripheral shielding component is fitted onto the outer periphery of the yoke to shield the outer peripheral surface of the yoke, and the inner peripheral shielding component is fitted onto the inner periphery of the tooth to shield the inner peripheral surface of the tooth, forming a combination of the jig and the motor core. The outer peripheral shielding component and the inner peripheral shielding component are spaced apart to expose the sidewall of the tooth.

[0088] Step S406: Place the assembly of the fixture and the motor core on an electrostatic generator for powder coating.

[0089] In step S404, the outer peripheral masking component masks the outer peripheral surface of the yoke, isolating it from the insulating powder during the powder coating process and preventing the yoke's outer peripheral surface from being coated with insulating powder. Similarly, the inner peripheral masking component masks the inner peripheral surface of the teeth, isolating it from the insulating powder during the powder coating process and preventing the teeth's inner peripheral surface from being coated with insulating powder. The exposed tooth sidewalls can come into contact with the insulating powder during the powder coating process, allowing the insulating powder to cover the tooth sidewalls. The fixture can assemble a complete motor core. After assembling the complete motor core, the fixture can mask the inner peripheral surface of the teeth and the outer peripheral surface of the yoke, exposing the tooth sidewalls. The motor core only needs to be assembled with the fixture once during the powder coating operation, and the entire tooth sidewall can be coated with insulating powder in a single application. Because it can assemble complete motor cores, it eliminates the tedious process of disassembling and assembling motor cores, improves the powder coating efficiency of motor cores, and facilitates large-scale automated powder coating operations for motor cores. It can solve the technical problem of low powder coating efficiency caused by the need to disassemble the core into core units before clamping.

[0090] Please refer to the following: Figure 22 In some embodiments, the peripheral shielding assembly includes a first cover and a second cover, the first cover including a first sidewall and a first limiting flange, and the second cover including a second sidewall and a second limiting flange.

[0091] In step S404, fitting the peripheral shielding component onto the outer periphery of the yoke includes:

[0092] Step S4042: Insert the motor core axially into the first side enclosure until the end face of the yoke part fits against the first limiting flange, forming a combination of the first cover and the motor core.

[0093] Step S4044: Insert the assembly of the first cover and the motor core axially into the second side enclosure until the end face of the other yoke portion, which is away from the first limiting flange, fits against the second limiting flange, and the first side enclosure and the second side enclosure are interference-fitted.

[0094] In step S4042, the motor core is inserted axially into the first sidewall. The first sidewall can cover the outer peripheral surface of the yoke, isolating the outer peripheral surface of the yoke from the insulating powder during powder coating, thus preventing the outer peripheral surface of the yoke from being coated with insulating powder. The first limiting flange is then fitted to the end face of the yoke. Firstly, the first limiting flange acts as a limit; when the first cover is assembled with the motor core, the motor core is inserted axially into the first sidewall until the end face of the yoke is fitted with the first limiting flange, at which point the motor core is fully inserted. Secondly, the first limiting flange can at least partially cover the end face of the yoke, isolating the covered portion of the yoke end face from the insulating powder during powder coating, preventing the covered portion of the yoke end face from being coated with insulating powder, and allowing the uncovered portion of the yoke end face to come into contact with the insulating powder, thus coating the uncovered portion of the yoke end face with insulating powder. By designing the inner diameter of the first limiting flange, the size of the portion of the yoke end face that is covered can be adjusted. In this embodiment, the inner diameter of the first limiting flange is slightly larger than the inner diameter of the yoke. The first limiting flange covers the outer ring portion of the yoke end face. When the motor core is coated with powder, the outer ring portion of the yoke end face will not be coated with insulating powder, while the inner ring portion can be coated with insulating powder, as shown in the figure. Depending on actual needs, the inner diameter of the first limiting flange can also be smaller than or equal to the inner diameter of the yoke, so that the first limiting flange can completely cover the yoke end face, and the entire yoke end face will not be coated with insulating powder. Depending on actual needs, the first limiting flange can also be omitted to expose the entire yoke end face, and the entire yoke end face can be coated with insulating powder. In a third aspect, the fit between the first limiting flange and the yoke end face can cover the gap between the outer peripheral surface of the yoke and the first sidewall, making it difficult for insulating powder to come into contact with the outer peripheral surface of the yoke through this gap, thus improving the yield rate.

[0095] In step S4044, the second limiting flange abuts against the end face of the yoke. Firstly, the second limiting flange acts as a limit. When the second cover is assembled with the assembly of the first cover and the motor core, the assembly of the first cover and the motor core is inserted axially into the second side panel until the other end face of the yoke, away from the first limiting flange, abuts against the second limiting flange. At this point, the assembly of the first cover and the motor core is fully inserted. Secondly, the second limiting flange can at least partially cover the end face of the yoke, so that the covered portion of the yoke end face is isolated from the insulating powder during powder coating, preventing the covered portion from being coated with insulating powder. This allows the uncovered portion of the yoke end face to contact the insulating powder, and the uncovered portion is coated with insulating powder. By designing the inner diameter of the second limiting flange, the size of the portion of the yoke end face that is covered can be adjusted. In this embodiment, the inner diameter of the second limiting flange is slightly larger than the inner diameter of the yoke. The second limiting flange covers the outer ring portion of the yoke end face. When the motor core is coated with powder, the outer ring portion of the yoke end face will not be coated with insulating powder, while the inner ring portion can be coated with insulating powder, as shown in the figure. Depending on actual needs, the inner diameter of the second limiting flange can also be smaller than or equal to the inner diameter of the yoke, so that the second limiting flange can completely cover the yoke end face, and the entire yoke end face will not be coated with insulating powder. Depending on actual needs, the second limiting flange can also be omitted to expose the entire yoke end face, and the entire yoke end face can be coated with insulating powder. In a third aspect, the fit between the second limiting flange and the yoke end face can cover the gap between the outer peripheral surface of the yoke and the first sidewall, making it difficult for insulating powder to come into contact with the outer peripheral surface of the yoke through this gap, thus improving the yield rate.

[0096] In some embodiments, step S406, placing the assembly of the fixture and the motor core on an electrostatic generator for powder coating, may include the electrostatic generator conveying the assembly of the motor core and the fixture to the powder coating area. In the powder coating area, insulating powder is sprayed, and after contacting the tooth sidewalls, the insulating powder adheres to the tooth sidewalls to form an insulating layer.

[0097] The electrostatic generator includes a conveying mechanism that can transport the assembly of the fixture and the motor core to the powder coating area.

[0098] The fixture may include a conductive component, which is electrically connected to the motor core. This component is used for conductive connection to an electrostatic precipitator, specifically to the ground wire of the electrostatic precipitator. After the conductive component is electrically connected to the electrostatic precipitator, the motor core is also electrically connected to the electrostatic precipitator through the conductive component, thus charging the motor core. Insulating powder, which can be adsorbed by the charge on the motor core, is sprayed into the powder coating area. The charge on the motor core can adsorb the small insulating powder particles, thereby improving the contact efficiency between the insulating powder and the tooth sidewalls, increasing powder coating efficiency, and shortening the powder coating time.

[0099] The insulating powder sprayed in the powder coating area can carry an electric charge. The polarity of the charge carried by the insulating powder is opposite to that carried by the motor core, which can further improve the ability of the motor core to adsorb the insulating powder.

[0100] Both the outer and inner peripheral shielding components can be made of insulating material. This prevents them from carrying a charge, thus avoiding competition with the motor core for insulating powder. The insulating powder will only be concentrated and adsorbed by the tooth sidewalls, not by the inner and outer shielding components, ensuring that the contact efficiency between the insulating powder and the tooth sidewalls is not reduced. Furthermore, since the inner and outer shielding components do not adsorb insulating powder, the workload for cleaning them later can be reduced.

[0101] It is understandable that the electrostatic generator does not need to keep the motor core charged throughout the entire powder coating process. It is sufficient that the motor core is electrically connected to the motor core through the conductive component at least when the assembly of the motor core and the fixture is transported to the powder coating area, so that the motor core is charged.

[0102] In some embodiments, the conductive component includes a support shaft. The axis of the support shaft is substantially coincident with the axis of the motor core. The electrostatic generator drives the motor core to rotate via the support shaft. The support shaft can cooperate with the electrostatic generator's conveying mechanism to drive the motor core to rotate. During powder coating of the motor core, the rotation of the motor core allows the tooth sidewalls to fully contact the insulating powder, resulting in uniform coating of the insulating powder on the tooth sidewalls. Specifically, the electrostatic generator's conveying mechanism can be a screw. When the screw rotates, it can move the assembly of the fixture and the motor core, and simultaneously drive the assembly to rotate. It is understood that the electrostatic generator does not need to drive the motor core to rotate via the support shaft throughout the entire powder coating process; it is sufficient that the electrostatic generator drives the motor core to rotate via the support shaft at least when conveying the assembly of the motor core and the fixture to the powder coating area.

[0103] Compared with the prior art, this utility model provides an inner circumferential shielding conductive device and a jig 100 for electrostatic powder coating of a motor core 200. After the motor core 200 is assembled, the inner circumferential shielding component 20 shields the inner circumferential surface 2040 of the teeth 204. During powder coating, this prevents the inner circumferential surface 2040 of the teeth from contacting the insulating powder, thus preventing the inner circumferential surface 2040 of the teeth from being coated with insulating powder. The motor core 200 does not need to be disassembled into core units to assemble the inner circumferential shielding conductive device, thereby solving the technical problem of low powder coating efficiency caused by the need to disassemble the core into core units before clamping in the prior art.

[0104] Furthermore, after the conductive component is electrically connected to the electrostatic generator, the motor core 200 is also electrically connected to the electrostatic generator through the conductive component, causing the motor core 200 to become charged. During powder coating, the motor core 200 can adsorb the light insulating powder, which is easily adsorbed by the motor core 200, resulting in high powder coating efficiency. The insulating inner circumferential shielding component 20 can avoid becoming charged, thus avoiding competition with the motor core 200 for insulating powder. The insulating powder can be concentrated and adsorbed by the motor core 200, ensuring efficient contact between the insulating powder and the motor core 200, and reducing the difficulty of cleaning the inner circumferential shielding conductive device later.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; under the concept of this utility model, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this utility model as described above. For the sake of brevity, they are not provided in detail; although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An inner circumferential shielding conductive device for electrostatic powder coating of a motor core, the motor core comprising a yoke and a plurality of circumferentially spaced teeth, the teeth extending radially from the inner circumferential surface of the yoke, each tooth comprising an inner circumferential surface; characterized in that, The inner circumferential shielding conductive device includes an inner circumferential shielding component and a conductive component. The inner circumferential shielding component is made of insulating material and is disposed on the inner circumference of the tooth to shield the inner circumferential surface of the tooth. The conductive component is electrically connected to the motor core.

2. The inner circumferential shielding conductive device according to claim 1, characterized in that, The inner circumferential shielding component includes a shielding main body and a number of circumferentially spaced positioning protrusions. The positioning protrusion is provided on the outer periphery of the shielding main body, and each positioning protrusion extends into the gap between two adjacent teeth. The shielding main body is located on the inner periphery of the tooth and forms a shielding surface that is in close contact with the inner periphery of the tooth with the positioning protrusion.

3. The inner circumferential shielding conductive device according to claim 2, characterized in that, The conductive component includes a support shaft and a conductive connector. The shielding body is sleeved on the outer periphery of the support shaft, and the conductive connector is embedded in the shielding body. One end of the conductive connector is conductively connected to the support shaft, and the other end is conductively connected to the inner circumferential surface of the tooth.

4. The inner circumferential shielding conductive device according to claim 3, characterized in that, The shielding main body is provided with a first through hole and a second through hole; The first through hole extends through both ends of the shielding body, and the support shaft passes through the first through hole; The second through hole extends from the side of the shielding body to communicate with the first through hole. The conductive connector is housed in the second through hole. One end of the conductive connector contacts the support shaft, and the other end contacts the inner circumferential surface of the tooth.

5. The inner circumferential shielding conductive device according to claim 4, characterized in that, The support shaft includes a first shaft portion, a first sleeve portion, a first threaded portion, a second shaft portion, and a second threaded portion; The first shaft portion and the second shaft portion clamp the shielding main body portion. The first threaded portion is located on the side of the first shaft portion near the shielding main body portion, and the second threaded portion is located on the side of the second shaft portion near the shielding main body portion. The first threaded portion and the second threaded portion are threaded together. The first sleeve portion is connected between the first shaft portion and the first threaded portion, and the first sleeve portion extends into the first through hole.

6. The inner circumferential shielding conductive device according to claim 5, characterized in that, The support shaft also includes a second sleeve portion; The second sleeve portion is connected between the second shaft portion and the second screw portion, and the first sleeve portion and the second sleeve portion extend into the first through hole from the openings on both sides of the first through hole.

7. The inner circumferential shielding conductive device according to claim 3, characterized in that, The inner peripheral shielding component also includes a limiting protrusion; The limiting protrusion is provided on the outer periphery of the shielding main body, and the limiting protrusion is located on the radial side of the tooth to abut against the tooth.

8. The inner circumferential shielding conductive device according to claim 4, characterized in that, The shielding main body is cylindrical, with the first through hole axially penetrating the shielding main body and the second through hole radially penetrating the shielding main body.

9. The inner peripheral shielding conductive device according to claim 8, characterized in that, The conductive connector is of several kinds, and the second through hole is of several kinds; Each of the conductive connectors is housed in a corresponding second through hole, one end of each conductive connector is conductively connected to the support shaft, and the other end of each conductive connector is conductively connected to the inner circumferential surface of a corresponding tooth.

10. A fixture for electrostatic powder coating of motor cores, characterized in that, The fixture includes an outer peripheral shielding component and an inner peripheral shielding conductive device as described in any one of claims 1-9; The outer peripheral shielding component shields the outer peripheral surface of the yoke portion, and the outer peripheral shielding component is spaced apart from the inner peripheral shielding conductive device to expose the tooth sidewalls of the tooth portion.

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