Motor and electric equipment

Abstract

The utility model relates to a motor and electric equipment, the motor comprises a motor shaft and a protection ring, the protection ring comprises a ring body and a plurality of conductive fiber bundles, the plurality of conductive fiber bundles are fixed in the ring body, the plurality of conductive fiber bundles are arranged at intervals along the circumferential direction of the ring body, and the same end of each conductive fiber bundle extends out of the ring body so as to be suitable for being in contact with the motor shaft; in the radial direction of the ring body, the length L of each conductive fiber bundle extending out of the ring body ranges from 1.5 mm to 3 mm, and the width W of the gap between the ring body and the motor shaft meets the condition that W is larger than or equal to 0.7 L-0. 1 mm and smaller than or equal to 0.8 L + 0.05 mm. The working performance and the service life of the motor can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular to a motor and an electrical device having the motor. Background Art

[0002] In order to prevent electrical corrosion of motor bearings that affects the working performance and service life of the motor bearings, a protective ring is usually provided on the motor shaft. The protective ring is used to ground the shaft voltage formed on the motor shaft to prevent the shaft voltage on the motor shaft from electrically corroding the motor bearings.

[0003] However, the conductive fiber bundle of the existing protective ring cannot take into account both the conductive performance and the wear resistance of the conductive fiber bundle, resulting in reduced working performance and life of the protective ring, thereby causing the protective effect of the protective ring on the motor bearing to be poor. Utility Model Content

[0004] To solve the above problems, the present application provides a motor, which can improve the working performance and life of the protective ring by optimizing the structure of the conductive fiber bundle in a targeted manner. The present application also provides an electrical device having the motor. Specifically, the following solutions are included.

[0005] The present application provides a motor, comprising a motor shaft and a protective ring, the protective ring comprising a ring body and a plurality of conductive fiber bundles, the plurality of conductive fiber bundles being fixed in the ring body, the plurality of conductive fiber bundles being arranged at intervals along the circumference of the ring body, the same end of each conductive fiber bundle extending out of the ring body so as to be suitable for contacting the motor shaft; wherein: along the radial direction of the ring body, the length L of each conductive fiber bundle extending out of the ring body is between 1.5 mm and 3 mm, and the width W of the gap between the ring body and the motor shaft satisfies the condition: 0.7L-0.1mm≤W≤0.8L+0.05mm.

[0006] The protective ring of the present application fixes multiple conductive fiber bundles in the ring body, so that the ring body can achieve the effect of accommodating and fixing each conductive fiber bundle, so as to ensure that each conductive fiber bundle can work stably. At the same time, by setting each conductive fiber bundle to extend out of the ring body, the extended end of the conductive fiber bundle can form contact with the motor shaft, so as to achieve the effect of conduction, so as to guide the current on the motor shaft out of the motor shaft, thereby reducing the shaft voltage on the motor shaft, and avoiding the undesirable phenomenon of excessive shaft voltage on the motor shaft causing electrical corrosion of the motor bearing.

[0007] The protective ring of the present application is configured such that the length L of each conductive fiber bundle extending out of the ring body is between 1.5mm and 3mm, and the width W of the gap between the ring body and the motor shaft satisfies the condition: 0.7L-0.1mm≤W≤0.8L+0.05mm, and the partial structure of the conductive fiber bundle extending out of the ring body has an appropriate length relative to the motor shaft, that is, it is ensured that the conductive fiber bundle has an appropriate interference length relative to the motor shaft. As a result, each conductive fiber bundle can maintain a suitable stiffness while continuing to contact the motor shaft. When the conductive fiber bundle is in a state of suitable stiffness, the conductive performance of the conductive fiber bundle can be improved, and the wear resistance of the conductive fiber bundle can be improved, thereby improving the overall working performance and life of the protective ring, and can further improve the effect of the conductive fiber bundle on the derivation of the current on the motor shaft, so as to improve the protective performance of the motor shaft. In other words, when the length of the conductive fiber bundle extended is too small or too large relative to the interference fit of the motor shaft, it may cause insufficient contact between the conductive fiber bundle and the outer peripheral surface of the motor shaft, thereby reducing the conductivity and thus reducing the conductivity. Therefore, by setting the width W of the gap between the protective ring and the motor shaft to meet the condition: 0.7L-0.1mm≤W≤0.8L+0.05mm, the length of the conductive fiber bundle extended relative to the interference fit of the motor shaft can be limited to an appropriate range, ensuring that the conductive fiber bundle has a suitable extended length relative to the motor shaft, thereby ensuring that the conductive fiber bundle is in continuous contact with the motor shaft, and further improving the conductivity of the conductive fiber bundle.

[0008] In one embodiment, the ring body includes a receiving ring and a cover plate, the receiving ring is fixedly connected to the cover plate, and a plurality of mounting grooves are provided on the surface of the receiving ring facing the cover plate; each mounting groove penetrates the ring body along the radial direction of the ring body, and a conductive fiber bundle is fixed in each mounting groove, wherein the conductive fiber bundle extends out of the ring body from one end of the mounting groove penetrating the ring body.

[0009] In this embodiment, by providing a receiving ring and a cover plate, the ring body forms a split structure, so as to ensure the conductive effect of the protection ring while facilitating the processing and manufacturing of the protection ring and reducing the manufacturing difficulty of the protection ring. By providing a mounting groove on the receiving ring, the conductive fiber bundle can be installed in the mounting groove to achieve the effect of accommodating and positioning each conductive fiber bundle. At the same time, by providing each mounting groove to penetrate the inner circumference of the ring body along the radial direction of the ring body, the conductive fiber bundle fixed in each mounting groove can at least partially extend out of the ring body, so that the extended end of the conductive fiber bundle can form contact with the motor shaft to conduct electricity.

[0010] In one embodiment, a plurality of fixed tooth groups are protruding from the surface of the cover plate facing the receiving ring, and the plurality of fixed tooth groups correspond one-to-one to the plurality of mounting grooves, and the fixed tooth groups are used to fix the conductive fiber bundles in the mounting grooves.

[0011] In this embodiment, a fixed tooth group is provided on the surface of the cover plate facing the receiving ring, and the position of the fixed tooth group is aligned with the installation groove, so that when the cover plate is fixedly connected to the receiving ring, the fixed tooth group can extend into the installation groove and form a squeezing effect on the conductive fiber bundle installed in the installation groove, which can increase the effective contact area between the conductive fiber bundle and the surface of the receiving ring, and then increase the conductive effect between the conductive fiber bundle and the receiving ring to improve the protective effect of the protective ring on the motor bearing. At the same time, by providing a fixed tooth group to squeeze the corresponding conductive fiber bundle, the conductive fiber bundle can be fixed in the installation groove to avoid the conductive fiber bundle from being displaced along the radial direction of the ring body and causing poor contact with the motor shaft, that is, the conductive fiber bundle can further improve the current extraction effect on the motor shaft.

[0012] In one embodiment, each fixed tooth group is provided with at least two fixed teeth at intervals along the radial direction of the ring body, and the fixed teeth are used to resist and squeeze the conductive fiber bundle.

[0013] In this embodiment, at least two fixed teeth are provided at intervals corresponding to each installation groove, and at least two fixed teeth squeeze the conductive fiber bundle from different positions along the radial direction of the ring body, thereby ensuring the effective contact area between the entire conductive fiber bundle and the receiving ring, so as to further improve the conductive effect between the conductive fiber bundle and the ring body, further enhance the protective effect of the protective ring on the motor bearing, and enhance the working performance of the protective ring.

[0014] In one embodiment, the cover plate and the receiving ring are both made by mold forming.

[0015] In this embodiment, the cover plate and the receiving ring are respectively manufactured by mold forming, which can improve the conductive effect of the protection ring, reduce the difficulty of the manufacturing process of the protection ring, and improve the manufacturing accuracy of the protection ring at the same time.

[0016] In one embodiment, along the circumference of the ring body, the cross-sectional shape of the fixed teeth is any one of a wave shape, a sawtooth shape, an arc shape or a straight line shape.

[0017] In one embodiment, along the radial direction of the ring body, the cross-sectional shape of the mounting groove includes at least one of a rectangle, an arc, a circle, a trapezoid, and a triangle.

[0018] In one embodiment, the protective ring includes a plurality of fixing members, which are arranged at intervals along the circumference of the ring body, and each fixing member is located between two mounting grooves; along the axial direction of the ring body, each fixing member is used to fix the cover plate and the receiving ring.

[0019] In this embodiment, by providing a fixing member, a fixed connection between the cover plate and the receiving ring can be achieved. At the same time, by fixing the cover plate and the receiving ring with a fixing member, the assembly accuracy and assembly efficiency of the protective ring can be improved, and the assembly difficulty between the cover plate and the receiving ring can be reduced. By arranging each fixing member between two mounting grooves, the installation and fixing effect of the mounting groove on the conductive fiber bundle can be ensured, and the structural strength of the protective ring can be improved. By arranging each fixing member to pass through the cover plate and be fixed to the receiving ring, the structural strength of the protective ring can be further improved.

[0020] In one embodiment, along the axial direction of the ring body, each fixing member simultaneously penetrates the cover plate and the receiving ring.

[0021] In one embodiment, a positioning hole and a positioning column that cooperate with each other are provided between the receiving ring and the cover plate, and the positioning column extends into the positioning hole to position the receiving ring and the cover plate.

[0022] In this embodiment, by providing positioning holes and positioning posts, and by the cooperation between the positioning holes and the positioning posts, a positioning effect can be formed on the receiving ring and the cover plate during the installation process of the receiving ring and the cover plate, so as to ensure that the fixing teeth on the cover plate can be aligned with the installation groove, thereby improving the assembly accuracy and assembly efficiency between the fixing teeth and the installation groove, and reducing the assembly difficulty between the receiving ring and the cover plate.

[0023] In one embodiment, a positioning hole is provided on the surface of the receiving ring facing the cover plate, and a positioning column is correspondingly provided on the surface of the cover plate facing the receiving ring. The positioning column extends into the positioning hole to position the receiving ring and the cover plate.

[0024] In one embodiment, a positioning column is provided on a surface of the cover plate facing the receiving ring, and a positioning hole is provided on a surface of the receiving ring facing the cover plate. The positioning column extends into the positioning hole to position the receiving ring and the cover plate.

[0025] In one embodiment, each conductive fiber bundle includes a plurality of conductive fibers, and the conductive fibers extend along a length direction of the conductive fiber bundle.

[0026] In one embodiment, the conductive fiber includes a core, a conductive layer and an adhesive layer. The conductive layer is wrapped around the core, the conductive layer is made of metal, the core is used to support the conductive layer, the adhesive layer is wrapped around the conductive layer, and the adhesive layer is used to bond multiple conductive fibers.

[0027] In this embodiment, by setting the conductive layer to be a metal material, the conductive fiber bundle can achieve the function of conducting electricity. By setting the core support in the conductive layer, the shape stability of the conductive layer can be maintained and the strength and stability of the conductive fiber as a whole can be improved. By setting an adhesive layer to bond multiple conductive fibers, the loose conductive fibers in the conductive fiber bundle can be bundled to improve the installation effect and installation efficiency of the conductive fiber bundle, and the overall diameter of the conductive fiber bundle can be controlled.

[0028] In one embodiment, the material of the adhesive layer is epoxy resin, polyacrylate, polyurethane, polyphenylene ether ketone, polyamide, polyimide or phenoxy resin.

[0029] In this embodiment, polymer resin materials such as epoxy resin, polyacrylate, polyurethane, polyphenylene ether ketone, polyamide, polyimide or phenoxy resin have good adhesion, chemical resistance and temperature resistance. By setting the material of the adhesive layer to epoxy resin, polyacrylate, polyurethane, polyphenylene ether ketone, polyamide, polyimide or phenoxy resin, the bundling effect of the conductive fiber bundle is ensured, the corrosion resistance of the conductive fiber is improved, the service life of the conductive fiber bundle can be extended, the stiffness of the conductive fiber bundle is enhanced, and the high temperature resistance of the conductive fiber bundle is improved.

[0030] In one embodiment, the mass fraction of the adhesive layer relative to the conductive fibers is between 0.5 wt % and 3 wt %.

[0031] In one embodiment, the core is carbon fiber or glass fiber.

[0032] In this embodiment, by setting the material of the core to carbon fiber or glass fiber, the durability and deformation resistance of each conductive fiber can be improved. At the same time, carbon fiber and glass fiber have the characteristics of light weight and low density, which can achieve lightweight conductive fiber bundles to reduce loads. Among them, carbon fiber can conduct electricity and has good wear resistance, so as to improve the wear resistance of the conductive fiber while further improving the conductive efficiency and effect of the conductive fiber.

[0033] In one embodiment, the material of the conductive layer includes at least one of copper, nickel, gold, silver, iron, zinc, and aluminum.

[0034] In one embodiment, the mass fraction of the conductive layer relative to the conductive fibers is between 20wt% and 80wt%.

[0035] In one embodiment, the protective ring is sleeved on the periphery of the motor shaft, and the conductive fiber bundle extends out of the ring body from the inner circumference of the ring body and contacts the outer circumference of the motor shaft; or, the protective ring is coaxially arranged in the motor shaft, and the conductive fiber bundle extends out of the ring body from the outer circumference of the ring body and contacts the inner circumference of the motor shaft.

[0036] The present application also provides an electrical device, comprising the motor in any of the above embodiments.

[0037] Because the electrical equipment of the present application uses the motor in any of the above embodiments, the electrical equipment of the present application has all possible beneficial effects of the motor in any of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 This is a schematic diagram of the working scenario of the motor in this application;

[0040] Figure 2 for Figure 1 A schematic structural diagram of a protective ring of the motor of the present application from a side perspective in the illustrated embodiment;

[0041] Figure 3 for Figure 1 A schematic structural diagram of the protection ring of the motor of the present application from another side in the illustrated embodiment;

[0042] Figure 4 for Figure 1 A schematic diagram of the planar structure of the motor of the present application from a side perspective after some structures are hidden in the illustrated embodiment;

[0043] Figure 5 for Figure 1 A schematic structural diagram of a protective ring of the motor of the present application from a side perspective in the illustrated embodiment;

[0044] Figure 6 for Figure 5 A schematic structural diagram of a side view of the conductive fiber bundle installed in the installation groove of the receiving ring in the illustrated embodiment;

[0045] Figure 7 for Figure 5 A schematic diagram of the cross-sectional structure of the ring body at position AA in the illustrated embodiment;

[0046] Figure 8 for Figure 5 A schematic diagram of the cross-sectional structure of the ring body at the BB position from one side in the illustrated embodiment;

[0047] Fig. 9 for Figure 5 A schematic diagram of the cross-sectional structure of the ring body at the CC position from one side in the illustrated embodiment;

[0048] Fig.10 for Fig. 9 A schematic diagram of the structure from a perspective of one side of the cover plate in the illustrated embodiment;

[0049] Fig.11 for Figure 1 A schematic structural diagram of a conductive fiber bundle of a protective ring of the motor of the present application from a side perspective in the illustrated embodiment;

[0050] Fig.12 for Fig.11 The illustrated embodiment is a schematic structural diagram from a side view of any conductive fiber in the conductive fiber bundle of the protective ring of the present application. DETAILED DESCRIPTION

[0051] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.

[0052] The following descriptions of the embodiments are with reference to the attached diagrams to illustrate specific embodiments that the present application can be used to implement. The serial numbers for the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present application, unless otherwise specified, include direct and indirect connections (couplings). The directional terms mentioned in the present application, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the present application, 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 cannot be understood as a limitation to the present application.

[0053] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be fixedly connected, detachably connected, or integrally connected; it can be mechanically connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances. It should be noted that the terms "first", "second", etc. in the specification and claims of this application and the drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including", "may include", "include", or "may include" used in this application indicate the existence of the corresponding functions, operations, elements, etc. disclosed, and do not limit one or more other functions, operations, elements, etc. In addition, the terms "including" or "include" indicate the existence of the corresponding features, numbers, steps, operations, elements, components, or combinations thereof disclosed in the specification, and do not exclude the existence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, and are intended to cover non-exclusive inclusions.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0055] The present application provides an electrical device, including a motor. The electrical device of the present application may be, but is not limited to, a vehicle or other equipment. In the present application specification, an electrical device is described as a vehicle as an example. Exemplarily, the vehicle includes a motor and a wheel, the motor is fixed to the body of the vehicle, and the wheel is rotatably connected to the body. The motor is transmission-connected to the wheel and is used to provide a driving force to drive the wheel to rotate.

[0056] See also Figure 1 , Figure 1 Schematic diagram of the working scene of the motor 100 of this application. Figure 1 As shown, the motor 100 of the present application includes a motor shaft 101, a motor bearing 102, a motor housing 103 and a protective ring 10. The motor shaft 101 is used to output power. The motor bearing 102 is used to fix the motor shaft 101 in the motor housing 103 and enable the motor shaft 101 to rotate around its own axis. The protective ring 10 is sleeved on the periphery of the motor shaft 101. The conductive fiber bundle 12 of the protective ring 10 is in contact with the outer peripheral surface 101a of the motor shaft 101 and is used to extract the current on the motor shaft 101.

[0057] Specifically, in Figure 1 In the illustrated embodiment, the outer ring of the motor bearing 102 is fixed on the motor housing 103, and the motor shaft 101 extends into the inner ring of the motor bearing 102 and is fixedly connected to the inner ring of the motor bearing 102, so as to fix the motor shaft 101 in the motor housing 103 and enable the motor shaft 101 to rotate around its own axis, thereby realizing the power output function of the motor 100 of the present application.

[0058] The protection ring 10 is fixedly mounted on the periphery of the motor shaft 101 or the protection ring 10 is coaxially mounted inside the motor shaft 101. Figure 1 In the embodiment shown, the protective ring 10 is coaxially sleeved on the outer periphery of the motor shaft 101 as an example for exemplary description, and the conductive fiber bundle 12 (see Figure 2 ) contacts the outer circumferential surface 101a of the motor shaft 101 so as to be able to conduct the current on the motor shaft 101. In other embodiments of the present application, the protective ring 10 can also be coaxially arranged in the motor shaft 101, and the conductive fiber bundle 12 contacts the inner circumferential surface of the motor shaft 101 so as to conduct the current on the motor shaft 101.

[0059] When the motor shaft 101 rotates around its own axis, a shaft voltage is formed on the motor shaft 101. At this time, if the shaft voltage on the motor shaft 101 exceeds the breakdown threshold of the lubricating oil, the shaft voltage will break through the oil film formed by the lubricating oil, and may cause partial discharge between the ball and the inner surface of the motor bearing 102, and generate electrical corrosion grooves on the inner surface of the motor bearing 102, that is, the motor bearing 102 is corroded, thereby affecting the working performance and working efficiency of the motor bearing 102, such as the motor bearing 102 may be stuck.

[0060] By setting a protective ring 10 to be sleeved on the periphery of the motor shaft 101 and conducting the current on the motor shaft 101 through the conductive fiber bundle 12, the shaft voltage on the motor shaft 101 can be reduced to avoid the adverse phenomenon of electrical corrosion of the motor bearing 102, thereby forming a protective effect on the motor bearing 102.

[0061] For example, in a possible embodiment, when a shaft voltage is formed on the motor shaft 101, the shaft current on the motor shaft 101 flows into the protective ring 10 through the conductive fiber bundle 12, and then flows from the protective ring 10 to the motor housing 103 fixedly connected to the protective ring 10. At this time, the motor housing 103 can be, but is not limited to, grounded, so that the current conducted to the motor housing 103 can be released into the ground, that is, the shaft voltage on the motor shaft 101 can be released into the ground.

[0062] In other words, the protective ring 10 is fixed to the periphery of the motor shaft 101, and each conductive fiber bundle 12 is arranged to contact the motor shaft 101, so that a conductive effect can be formed between the conductive fiber bundle 12 and the motor shaft 101, so as to conduct the current on the motor shaft 101 out of the motor shaft 101, thereby reducing the shaft voltage on the motor shaft 101, and avoiding the undesirable phenomenon of electrical corrosion of the motor bearing 102 due to excessively high shaft voltage on the motor shaft 101.

[0063] It should be noted that in Figure 1 In the illustrated embodiment, only one possible embodiment of the motor 100 is used as an example to exemplify the possible layout positions of the functional structural components in the motor 100, but the actual structure of the motor 100 and the functional structural components therein is not limited to this. That is, in other embodiments of the present application, the actual layout positions and structural dimensions of the motor 100 and the functional structural components therein can be adjusted according to actual design requirements, and the present application does not make specific limitations on this.

[0064] Please also read Figure 2 and Figure 3 , Figure 2 for Figure 1 The schematic diagram of the structure of the protective ring 10 of the motor 100 of the present application from a side view in the embodiment shown, Figure 3 for Figure 1 The structure diagram of the protection ring 10 of the motor 100 of the present application from another side is shown in the embodiment. Figure 2 and Figure 3 As shown, the protective ring 10 includes a ring body 11 and a plurality of conductive fiber bundles 12 . The plurality of conductive fiber bundles 12 are fixed in the ring body 11 , and the plurality of conductive fiber bundles 12 are arranged at intervals along the circumference of the ring body 11 .

[0065] By fixing the plurality of conductive fiber bundles 12 in the ring body 11 , the ring body 11 can achieve the effect of accommodating and fixing each conductive fiber bundle 12 , so as to ensure that each conductive fiber bundle 12 can work stably.

[0066] The same end of each conductive fiber bundle 12 extends out of the ring body 11 so as to be suitable for contacting the motor shaft 101. Figure 2 and Figure 3 As shown, the protective ring 10 is coaxially sleeved on the periphery of the motor shaft 101, and each conductive fiber bundle 12 extends toward the center of the ring body 11 and extends out of the ring body 11 from the inner circumference 11a of the ring body 11, so as to be able to contact and conduct electricity with the outer circumference of the motor shaft 101. In other embodiments of the present application, the protective ring 10 can also be coaxially arranged inside the motor shaft 101, and each conductive fiber bundle 12 extends out of the ring body 11 from the outer circumference of the ring body 11, so as to be able to contact and conduct electricity with the inner circumference of the motor shaft 101.

[0067] In the present specification, an example is given in which each conductive fiber bundle 12 extends out of the ring body 11 from the inner circumferential surface 11 a of the ring body 11 and contacts the outer circumferential surface of the motor shaft 101 .

[0068] It can be understood that the same end of each conductive fiber bundle 12 extends out of the ring body 11, so that the extended end of the conductive fiber bundle 12 can form contact with the motor shaft 101, thereby achieving a conductive effect, so as to conduct the current on the motor shaft 101 out of the motor shaft 101, thereby reducing the shaft voltage on the motor shaft 101, and avoiding the undesirable phenomenon of electrical corrosion of the motor bearing 102 caused by excessive shaft voltage on the motor shaft 101.

[0069] Along the radial direction of the ring body 11 , the length L of each conductive fiber bundle 12 extending from the ring body 11 is between 1.5 mm and 3 mm.

[0070] Specifically, in Figure 3 In the embodiment shown, the length of the conductive fiber bundle 12 extending out of the ring body 11 can be understood as the distance between the inner circumferential surface 11a of the ring body 11 and the end of the conductive fiber bundle 12 away from the ring body 11 along the radial direction of the ring body 11. Figure 3Schematically, the conductive fiber bundle 12 extends out of the ring body 11 by a length L. The ring body 11 is an annular structure, and the radial direction of the ring body 11 can be understood as any diameter direction of the ring body 11.

[0071] It can be understood that by setting the length L of each conductive fiber bundle 12 extending from the ring body 11 to be between 1.5 mm and 3 mm, each conductive fiber bundle 12 can maintain appropriate stiffness while continuing to contact the outer circumferential surface 101a of the motor shaft 101.

[0072] For an example, see Figure 4 , Figure 4 for Figure 1 In the illustrated embodiment, the motor 100 of the present application is a planar structural diagram from a side perspective after some structures are hidden. In order to clearly illustrate the layout position and structural features between the guard ring 10 and the motor shaft 101, Figure 4 In the illustrated embodiment, the stator, rotor, motor bearing 102 and other possible functional components of the motor 100 are omitted.

[0073] Along the radial direction of the protection ring 10, the width W of the gap between the ring body 11 and the motor shaft 101 satisfies the condition: 0.7L-0.1mm≤W≤0.8L+0.05mm. Figure 4 In the illustrated embodiment, the width W of the gap 104 between the inner circumferential surface 11 a of the ring body 11 of the protection ring 10 and the outer circumferential surface 101 a of the motor shaft 101 satisfies the condition: 0.7L-0.1 mm≤W≤0.8L+0.05 mm.

[0074] Specifically, Figure 4 As shown, when the protective ring 10 is coaxially sleeved on the outer periphery of the motor shaft 101, along the radial direction of the protective ring 10, the ring body 11 of the protective ring 10 is spaced a certain distance from the motor shaft 101, thereby forming a gap 104 between the inner circumference 11a of the ring body 11 and the outer circumference 101a of the motor shaft 101. The width of the gap 104 is Figure 4 The width W of the gap 104 is shown in FIG.

[0075] By setting the width W of the gap 104 between the inner circumference 11a of the ring body 11 of the protective ring 10 and the outer circumference 101a of the motor shaft 101, the condition is satisfied: 0.7L-0.1mm≤W≤0.8L+0.05mm, so that the part of the conductive fiber bundle 12 extending out of the inner circumference 11a of the ring body 11 can have an appropriate length relative to the motor shaft 101, that is, it is ensured that the conductive fiber bundle 12 has an appropriate interference length relative to the motor shaft 101.

[0076] For example, in Figure 4In the illustrated embodiment, along the radial direction of the protective ring 10 , the length L of the conductive fiber bundle 12 extending out of the ring body 11 is greater than the width W of the gap 104 , so as to ensure that the conductive fiber bundle 12 can contact the outer peripheral surface 101a of the motor shaft 101 to realize the conductive function of the conductive fiber bundle 12 .

[0077] In the radial direction of the protection ring 10, the conductive fiber bundle 12 extends out of the gap 104 for a part of its length (at Figure 4 104, which is shown as the length 12a of the conductive fiber bundle 12 extending out of the gap 104, which can be understood as the interference X formed by the conductive fiber bundle 12 relative to the motor shaft 101, that is, the length of the conductive fiber bundle 12 in contact with the outer peripheral surface 101a of the motor shaft 101. It can also be understood that the interference X formed by the conductive fiber bundle 12 relative to the motor shaft 101 is the difference between the length L of the conductive fiber bundle 12 extending out of the ring body 11 and the width W of the gap 104.

[0078] It is understandable that when the length L of the conductive fiber bundle 12 extending out of the ring body 11 is too small or too large relative to the interference X of the motor shaft 101, it may cause the conductive fiber bundle 12 to be insufficiently in contact with the outer peripheral surface 101a of the motor shaft 101, thereby reducing the conductivity. For example, when the interference X formed by the conductive fiber bundle 12 relative to the motor shaft 101 is too large, it may cause the conductive fiber bundle 12 to deform too much at the end away from the ring body 11 and fail to form a continuous and effective contact with the outer peripheral surface 101a of the motor shaft 101. Alternatively, when the interference X formed by the conductive fiber bundle 12 relative to the motor shaft 101 is too small, it may cause the conductive fiber bundle 12 to be insufficiently in contact with the outer peripheral surface 101a of the motor shaft 101, affecting the conductivity efficiency, and causing the wear resistance of the conductive fiber bundle 12 to decrease, thereby reducing the working life of the conductive fiber bundle 12.

[0079] Therefore, by setting the width W of the gap between the inner circumference of the ring body of the protective ring and the outer circumference of the motor shaft to meet the condition: 0.7L-0.1mm≤W≤0.8L+0.05mm, the interference X formed by the conductive fiber bundle 12 relative to the motor shaft 101 can be limited to meet the condition: 0.2L-0.05mm≤X≤0.3L+0.1mm. In addition, the length L of the conductive fiber bundle 12 extending out of the ring body 11 and the interference X formed by the conductive fiber bundle 12 relative to the motor shaft 101 can form a mutual correlation and mutual coordination effect, so that the length L of the conductive fiber bundle 12 extending out of the ring body 11 relative to the interference X of the motor shaft 101 is within an appropriate range, ensuring that the conductive fiber bundle 12 has a suitable extension length relative to the motor shaft 101, so as to ensure that the conductive fiber bundle 12 is in continuous contact with the outer circumference 101a of the motor shaft 101, and further improve the conductive performance of the conductive fiber bundle 12.

[0080] The length of the conductive fiber bundle of the existing protective ring extending out of the ring body cannot take into account both the conductive performance and the wear resistance of the conductive fiber bundle, resulting in reduced working performance and life of the protective ring, which leads to poor protection effect of the protective ring on the motor bearing. For example, when the length of the conductive fiber bundle extending out of the ring body is too long, the stiffness of the conductive fiber bundle may be insufficient, resulting in the conductive fiber bundle being unable to continuously contact the outer peripheral surface 101a of the motor shaft 101. Or, when the length of the conductive fiber bundle extending out of the ring body is too short, the stiffness of the conductive fiber bundle may be too large and the wear resistance of the conductive fiber bundle may be reduced, resulting in a shortened life of the conductive fiber bundle. That is, when the length of the conductive fiber bundle extending out of the ring body is too long or too short, the stiffness of the conductive fiber bundle cannot be in a better working state, resulting in the conductive fiber bundle being unable to take into account both working performance and working life.

[0081] The protective ring 10 of the present application sets the length L of the conductive fiber bundle 12 extending out of the ring body 11 to be between 1.5mm-3mm, and the width W of the gap between the ring body and the motor shaft meets the condition: 0.7L-0.1mm≤W≤0.8L+0.05mm, and makes the part of the conductive fiber bundle 12 extending out of the ring body 11 have a suitable length relative to the motor shaft 101, that is, ensures that the conductive fiber bundle 12 has a suitable interference length relative to the motor shaft 101. Then, the conductive fiber bundle 12 is in a state of suitable stiffness, which can improve the conductive performance of the conductive fiber bundle 12, and can improve the wear resistance of the conductive fiber bundle 12, thereby improving the overall working performance and life of the protective ring 10, and can further improve the conductive fiber bundle 12 The effect of the current on the motor shaft 101 is further improved to improve the protective performance of the motor shaft 101.

[0082] Because the electrical equipment of the present application uses the motor 100 in any of the above embodiments, the electrical equipment of the present application has all possible beneficial effects of the motor 100 in any of the above embodiments.

[0083] For an embodiment, please refer to Figure 5 and Figure 6 , Figure 5 for Figure 1 The schematic diagram of the structure of the protective ring 10 of the motor 100 of the present application from a side view in the embodiment shown, Figure 6 for Figure 5 The structure diagram of the conductive fiber bundle 12 in the embodiment shown is a side view of the installation groove 1111 of the receiving ring 111. Figure 5 and 6 As shown, the ring body 11 includes a receiving ring 111 and a cover plate 112 . The receiving ring 111 is fixedly connected to the cover plate 112 . A plurality of mounting grooves 1111 are provided on the surface of the receiving ring 111 facing the cover plate 112 . The plurality of mounting grooves 1111 are arranged at intervals along the circumference of the receiving ring 111 .

[0084] By providing the receiving ring 111 and the cover plate 112 , the ring body 11 forms a split structure, so as to facilitate the processing and manufacturing of the protection ring 10 while ensuring the conductive effect of the protection ring 10 , thereby reducing the manufacturing difficulty of the protection ring 10 .

[0085] Each mounting groove 1111 along the radial direction of the ring body 11 penetrates the ring body 11, and a conductive fiber bundle 12 is fixed in each mounting groove 1111, wherein the conductive fiber bundle 12 extends out of the ring body 11 from one end of the mounting groove 1111 penetrating the ring body 11. That is, the number of mounting grooves 1111 provided on the surface of the receiving ring 111 facing the cover plate 112 is the same as the number of the conductive fiber bundles 12, and each conductive fiber bundle 12 is correspondingly installed in one mounting groove 1111, so that the mounting groove 1111 can form a receiving effect for the conductive fiber bundle 12.

[0086] It can be understood that by providing the installation groove 1111 on the receiving ring 111, the conductive fiber bundle 12 can be installed in the installation groove 1111 to achieve the effect of receiving and positioning each conductive fiber bundle 12. At the same time, by providing each installation groove 1111 to penetrate the inner circumference 11a of the ring body 11 along the radial direction of the ring body 11, the conductive fiber bundle 12 fixed in each installation groove 1111 can at least partially extend from the inner circumference 11a of the ring body 11, and then the conductive fiber bundle 12 can be extended to the outer circumference 101a of the motor shaft 101 to form contact with one end thereof to conduct electricity.

[0087] In one embodiment, along the radial direction of the ring body 11 , the cross-sectional shape of the mounting groove 1111 may be, but is not limited to, at least one of a rectangle, an arc, a circle, a trapezoid, and a triangle.

[0088] That is, the cross-sectional shape of the mounting groove 1111 can be any one of a rectangle, an arc, a circle, a trapezoid, and a triangle, or a shape formed by a combination of multiple shapes of rectangle, arc, circle, trapezoid, and triangle. Figure 5 and Figure 6 As shown, since the installation groove 1111 extends in the radial direction of the ring body 11, the cross-sectional shape of the installation groove 1111 in the radial direction of the ring body 11 can be understood as a cross-sectional shape perpendicular to the extension direction of each installation groove 1111, or it can be understood as a cross-sectional shape of each installation groove 1111 parallel to the circumferential direction of the ring body 11 at this position. At this time, the cross-sectional shape of each installation groove 1111 in the radial direction of the ring body 11 can be, but is not limited to, at least one of a rectangle, an arc, a circle, a trapezoid, and a triangle.

[0089] In one embodiment, the cover plate 112 and the receiving ring 111 are both made by die forming. By making the cover plate 112 and the receiving ring 111 respectively by die forming, the manufacturing process difficulty of the protection ring 10 can be reduced, and the manufacturing accuracy of the protection ring 10 can be improved at the same time.

[0090] For an example, see Figure 7 , Figure 7 for Figure 5 The cross-sectional structure diagram of the ring body 11 at the AA position in the embodiment shown. Figure 7 As shown, the ring body 11 includes a plurality of fixing members 14, which are arranged at intervals along the circumference of the ring body 11, and each fixing member 14 is respectively located between two mounting grooves 1111. Along the axial direction of the ring body 11, each fixing member 14 is used to fix the cover plate 112 and the receiving ring 111.

[0091] Specifically, Figure 7 As shown, the cover plate 112 is provided with a plurality of mounting holes 1121, which penetrate the cover plate 112 along the axial direction of the ring body 11. The plurality of mounting holes 1121 are arranged at intervals along the circumference of the ring body 11, and the position of each mounting hole 1121 corresponds to the position between the two mounting grooves 1111 of the receiving ring 111.

[0092] The number of the fixing members 14 is the same as the number of the mounting holes 1121. That is, each fixing member 14 corresponds to one mounting hole 1121, and each fixing member 14 extends into one mounting hole 1121 and is fixed to the receiving ring 111, thereby achieving a fixed connection between the cover plate 112 and the receiving ring 111.

[0093] exist Figure 7 In the illustrated embodiment, the number of the fixing members 14 is 4. The 4 fixing members 14 are sequentially spaced apart along the circumference of the ring body 11, and the 4 fixing members 14 are symmetrically arranged with respect to the ring body 11, so as to evenly fix the receiving ring 111 and the cover plate 112, ensure the uniformity of the structural strength at each position of the protection ring 10, and improve the use effect and service life of the protection ring 10.

[0094] By providing the fixing member 14, the cover plate 112 and the receiving ring 111 can be fixedly connected. At the same time, by fixing the cover plate 112 and the receiving ring 111 with the fixing member 14, the assembly accuracy and efficiency of the ring body 11 can be improved, and the assembly difficulty between the cover plate 112 and the receiving ring 111 can be reduced.

[0095] By arranging each fixing member 14 between two mounting grooves 1111, the mounting and fixing effect of the mounting grooves 1111 on the conductive fiber bundle 12 can be ensured, and the structural strength of the ring body 11 can be improved. By arranging each fixing member 14 to pass through the cover plate 112 and be fixed to the receiving ring 111, the structural strength of the ring body 11 can be further improved.

[0096] In a possible embodiment, the fixing member 14 may be, but is not limited to, a structural member such as a rivet or a pressure riveting column, so as to achieve a pressure riveting connection effect between the receiving ring 111 and the cover plate 112 .

[0097] A possible embodiment is as follows Figure 7 As shown. A countersunk groove 1121a is formed at one end of the mounting hole 1121 away from the receiving ring 111. Along the axial direction of the ring body 11, the cross-sectional area of ​​the mounting hole 1121 is smaller than the cross-sectional area of ​​the countersunk groove 1121a. When the fixing member 14 extends into the mounting hole 1121 and is fixed on the receiving ring 111, the countersunk groove 1121a can accommodate the possible excess material deformation of the fixing member 14.

[0098] It should be noted that in Figure 7 In the embodiment shown, only four fixing members 14 are used as an example for illustrative description, but the number of fixing members 14 used to fix the cover plate 112 and the receiving ring 111 is not limited to only four. The number of fixing members 14 can be adjusted according to actual design requirements or structural strength requirements, and the embodiment of the present application does not specifically limit this.

[0099] At the same time, Figure 7 In the illustrated embodiment, the example of the fixing member 14 penetrating the cover plate 112 along the axial direction of the ring body 11 is used for illustrative description, but the fixing member 14 is not limited to only penetrating the cover plate 112 .

[0100] For example, in a possible embodiment, along the axial direction of the ring body 11 , each fixing member 14 may also penetrate the cover plate 112 and the receiving ring 111 at the same time.

[0101] For an example, see Figure 8 , Figure 8 for Figure 5 The cross-sectional structure diagram of the ring body 11 at the BB position in the embodiment shown. A positioning hole and a positioning column that cooperate with each other are provided between the receiving ring 111 and the cover plate 112. The positioning column extends into the positioning hole to position the receiving ring 111 and the cover plate 112.

[0102] For example, in Figure 8In the illustrated embodiment, a positioning hole 1122 is provided on the surface of the receiving ring 111 facing the cover plate 112 , and a positioning column 1112 is correspondingly provided on the surface of the cover plate 112 facing the receiving ring 111 . The positioning column 1112 extends into the positioning hole 1122 to position the receiving ring 111 and the cover plate 112 .

[0103] Specifically, Figure 8 As shown, a positioning column 1112 is protruded on the surface of the receiving ring 111 facing the cover plate 112. A positioning hole 1122 is provided on the surface of the cover plate 112 facing the receiving ring 111, which cooperates with the positioning column 1112 and extends from the surface of the cover plate 112 facing the receiving ring 111 to the surface of the cover plate 112 away from the receiving ring 111.

[0104] The number of the positioning holes 1122 is equal to the number of the positioning posts 1112 , and each positioning hole 1122 is correspondingly arranged to a positioning post 1112 , so that each positioning post 1112 can extend into a positioning hole 1122 to achieve a positioning effect.

[0105] The positioning hole 1122 may completely penetrate the cover plate 112 along the axial direction of the ring body 11, or may partially penetrate the cover plate 112. In other words, along the axial direction of the ring body 11, the penetration length of the positioning hole 1122 may be, but is not limited to, equal to the extension length of the positioning column 1112, or may be greater than the extension length of the positioning column 1112.

[0106] It can be understood that by providing the positioning hole 1122 and the positioning column 1112, and by the cooperation between the positioning hole 1122 and the positioning column 1112, the receiving ring 111 and the cover plate 112 can be positioned during the installation process of the receiving ring 111 and the cover plate 112, so as to ensure that the fixing teeth 1123 on the cover plate 112 (see Fig.10 ) can be aligned with the installation groove 1111, thereby improving the assembly accuracy and efficiency between the fixing tooth 1123 and the installation groove 1111, and reducing the assembly difficulty between the receiving ring 111 and the cover plate 112.

[0107] It should be noted that in Figure 8 Only one possible embodiment of the positioning hole 1122 and the positioning column 1112 is used as an example for illustrative description, but the structural position, structural size, etc. of the positioning hole 1122 and the positioning column 1112 of the present application are not limited to this. That is, the layout position of the positioning hole 1122 and the positioning column 1112 and their respective structural sizes can be adjusted according to actual design requirements, and the present application does not make specific limitations on this.

[0108] For example, in a possible embodiment, a positioning column is provided on a surface of the cover plate 112 facing the receiving ring 111 , and a positioning hole is provided on a surface of the receiving ring 111 facing the cover plate 112 .

[0109] Please also read Fig. 9 and Fig.10 , Fig. 9 for Figure 5 The cross-sectional structure diagram of the ring body 11 at the CC position of the embodiment shown is a side view, Fig.10 for Fig. 9 The cover plate 112 is a schematic structural diagram from a side view of the embodiment shown. The surface of the cover plate 112 facing the receiving ring 111 is at least partially in contact with each conductive fiber bundle 12 to fix the conductive fiber bundle 12 in the installation groove 1111.

[0110] Specifically, a plurality of fixing tooth groups 1123 a are protruded from the surface of the cover plate 112 facing the receiving ring 111 . The fixing tooth groups 1123 a are used to fix the conductive fiber bundle 12 in the installation groove 1111 .

[0111] like Fig. 9 and Fig.10 As shown, the plurality of fixed tooth groups 1123a correspond one to one with the plurality of mounting slots 1111. That is, the position of each fixed tooth group 1123a is aligned with one mounting slot 1111. Each fixed tooth group 1123a is provided with at least two fixed teeth 1123 at intervals, that is, at least two fixed teeth 1123 form one fixed tooth group 1123a.

[0112] In other words, a plurality of fixed tooth groups 1123a are sequentially arranged at intervals along the circumferential direction of the cover plate 112, and each fixed tooth group 1123a extends along the radial direction of the cover plate 112. Each fixed tooth group 1123a is arranged corresponding to the position of a mounting slot 1111, so that the fixed teeth 1123 in each fixed tooth group 1123a can extend into the mounting slot 1111 to form abutment with the conductive fiber bundle 12, thereby fixing the conductive fiber bundle 12 in the mounting slot 1111.

[0113] Each fixed tooth group 1123a is provided with at least two fixed teeth 1123 arranged at intervals along the radial direction of the cover plate 112, and at least two fixed teeth 1123 can extend into the corresponding installation groove 1111, and abut and squeeze the conductive fiber bundle 12 installed in the installation groove 1111 to fix the corresponding conductive fiber bundle 12.

[0114] It can be understood that by setting fixed teeth 1123 on the surface of the cover plate 112 facing the receiving ring 111, and setting the position of the fixed teeth 1123 to be aligned with the installation groove 1111, when the cover plate 112 and the receiving ring 111 are fixedly connected, the fixed teeth 1123 can extend into the installation groove 1111 and form a squeezing effect on the conductive fiber bundle 12 installed in the installation groove 1111, which can increase the effective contact area between the conductive fiber bundle 12 and the surface of the receiving ring 111, thereby improving the conductive effect between the conductive fiber bundle 12 and the receiving ring 111 to improve the protection effect of the motor bearing 102.

[0115] Furthermore, by squeezing the corresponding conductive fiber bundle 12 through the fixed tooth group 1123a, the conductive fiber bundle 12 can be fixed in the mounting groove 1111, so as to avoid the conductive fiber bundle 12 being displaced radially along the ring body 11 and causing poor contact with the motor shaft 101, thereby further improving the effect of the conductive fiber bundle 12 on the extraction of current on the motor shaft 101.

[0116] At the same time, by providing at least two fixed teeth 1123 spaced apart corresponding to each installation groove 1111, at least two fixed teeth 1123 squeeze the conductive fiber bundle 12 from different positions along the radial direction of the receiving ring 111, thereby ensuring the effective contact area between the entire conductive fiber bundle 12 and the receiving ring 111, so as to further improve the conductive effect between the conductive fiber bundle 12 and the receiving ring 111, and further improve the protective effect of the protective ring 10 of the present application on the motor bearing 102, thereby improving the performance and effect of the protective ring 10 of the present application.

[0117] In one embodiment, Fig. 9 In the illustrated embodiment, the fixed teeth 1123 abut and press the conductive fiber bundle 12 along the axial direction of the ring body 11 .

[0118] In one embodiment, along the circumference of the ring body 11, the cross-sectional shape of the fixed teeth 1123 may be, but is not limited to, any one of a wave shape, a sawtooth shape, an arc shape, or a straight line shape. Fig. 9 As shown, the cross-sectional shape of the fixed teeth 1123 along the circumference of the ring body 11 can be understood as that the structural part of each fixed tooth 1123 protruding toward the receiving ring 111 has a cross-section perpendicular to the circumference of the ring body 11, and can also be understood as that the cross-section of each fixed tooth 1123 is parallel to the extension direction of the corresponding fixed tooth group 1123a. At this time, the cross-sectional shape of the structural part of each fixed tooth 1123 protruding toward the receiving ring 111 is any one of a wave shape, a sawtooth shape, an arc shape or a straight line shape.

[0119] For an example, see Fig.11 , Fig.11 for Figure 1The structure diagram of the conductive fiber bundle 12 of the protective ring 10 of the motor 100 of the present application from a side view in the embodiment shown. Fig.11 As shown, each conductive fiber bundle 12 includes a plurality of conductive fibers 121 , and the conductive fibers 121 extend along the length direction of the conductive fiber bundle 12 .

[0120] For an example, see Fig.12 , Fig.12 for Fig.11 The schematic diagram of the structure of any conductive fiber 121 in the conductive fiber bundle 12 of the protective ring 10 of the present application from a side view in the illustrated embodiment. The conductive fiber 121 includes a core 1211 , a conductive layer 1212 and an adhesive layer 1213 .

[0121] Specifically, in Fig.12 In the illustrated embodiment, the conductive layer 1212 is wrapped around the outer periphery of the wire core 1211 , the conductive layer 1212 is made of metal, the wire core 1211 is used to support the conductive layer 1212 , and the adhesive layer 1213 is wrapped around the outer periphery of the conductive layer 1212 , and the adhesive layer 1213 is used to bond multiple conductive fibers 121 .

[0122] It can be understood that by setting the conductive layer 1212 to be made of metal material, the conductive fiber bundle 12 can achieve the conductive function. By setting the core 1211 to be supported in the conductive layer 1212, the shape stability of the conductive layer 1212 can be maintained and the overall strength and stability of the conductive fiber 121 can be improved. By setting the adhesive layer 1213 to bond multiple conductive fibers 121, the loose conductive fibers 121 in the conductive fiber bundle 12 can be bundled to improve the installation effect and installation efficiency of the conductive fiber bundle 12, and the overall diameter of the conductive fiber bundle 12 can be controlled.

[0123] In one embodiment, the material of the conductive layer 1212 includes at least one of copper, nickel, gold, silver, iron, zinc, and aluminum.

[0124] In one embodiment, the mass fraction of the conductive layer 1212 relative to the conductive fiber 121 is between 20wt% and 80wt%.

[0125] In one embodiment, the core 1211 is carbon fiber or glass fiber. By setting the core 1211 to be carbon fiber or glass fiber, the durability and deformation resistance of each conductive fiber 121 can be improved. At the same time, carbon fiber and glass fiber have the characteristics of light weight and low density, which can achieve the lightweight of the conductive fiber bundle 12 to reduce the load. Among them, carbon fiber can conduct electricity and has good wear resistance, so as to improve the wear resistance of the conductive fiber 121 while further improving the conductive efficiency and effect of the conductive fiber 121.

[0126] In one embodiment, the material of the adhesive layer 1213 is any one of epoxy resin, polyacrylate, polyurethane, polyphenylene ether ketone, polyamide, polyimide, and phenoxy resin.

[0127] It is understandable that polymer resin materials such as epoxy resin, polyacrylate, polyurethane, polyphenylene ether ketone, polyamide, polyimide, phenoxy resin, etc. have good adhesion, chemical resistance and temperature resistance. By setting the material of the adhesive layer 1213 to be any one of epoxy resin, polyacrylate, polyurethane, polyphenylene ether ketone, polyamide, polyimide, and phenoxy resin, the bundling effect of the conductive fiber bundle 12 can be ensured, the corrosion resistance of the conductive fiber 121 can be improved, the service life of the conductive fiber bundle 12 can be extended, the stiffness of the conductive fiber bundle 12 can be enhanced, and the high temperature resistance of the conductive fiber bundle 12 can be improved.

[0128] In one embodiment, the mass fraction of the adhesive layer 1213 relative to the conductive fiber 121 is between 0.5 wt % and 3 wt %.

[0129] In one embodiment, when preparing the conductive layer 1212 on the core wire 1211, the outer peripheral surface of the core wire 1211 can be roughened first, that is, the core wire 1211 can be immersed in acetone, acidic, or alkaline solution, so as to roughen the outer peripheral surface of the core wire 1211 and improve the roughness of the core wire 1211.

[0130] After completing the preparation process of the conductive layer 1212 on the wire core 1211, the wire core 1211 and the conductive layer 1212 wrapped on the wire core 1211 can be, but is not limited to, cleaned and then placed in a container containing any one of epoxy resin, polyacrylate, polyurethane, polyphenylene ether ketone, polyamide, polyimide, and phenoxy resin, and finally pulled out from a mold hole of a specific diameter, thereby obtaining a conductive fiber bundle 12 with a preset diameter tightened.

[0131] Furthermore, the conductive layer 1212 may be prepared on the outer peripheral surface of the core wire 1211 by, but not limited to, electroplating or chemical plating, so as to achieve the effect of the conductive layer 1212 wrapping around the core wire 1211 .

[0132] It can be understood that before preparing the conductive layer 1212 on the outer surface of the wire core 1211, the outer surface of the wire core 1211 is roughened first, which can improve the adhesion effect and stability of the metal of the conductive layer 1212 on the outer surface of the wire core 1211, and further improve the bonding stability between the conductive layer 1212 and the wire core 1211.

[0133] The protective ring 10 of the present application is mounted on a high-power automotive oil-cooled motor, and the motor shaft 101 of the motor 100 is set to run at a speed of 12000 r / min and without oil for 200 hours, and the wear length of the conductive fiber 111 is measured in multiple embodiments. At the same time, the protective ring 10 of the present application is mounted on a high-power automotive oil-cooled motor, and the rated power of the motor 100 is set to 550V. When the motor shaft 101 of the motor 100 is at a speed of 12000 r / min and a torque of 50 N·m, the shaft voltage of the motor shaft 101 is measured when the motor 100 is in different embodiments to test the conductive performance of the protective ring 10. Among them, Examples 4 to 11 are comparative examples provided by the present application. Specifically, Examples 4 to 9 are comparative examples provided when the interference X formed by the conductive fiber bundle relative to the motor shaft does not satisfy the condition 0.2L-0.05mm≤X≤0.3L+0.1mm, and Examples 10 and 11 are comparative examples provided when the length L of the conductive fiber extending out of the ring body is not between 1.5mm-3mm. For details, please refer to Table 1:

[0134]

[0135] It can be understood that when the length L of the conductive fiber bundle 12 extending out of the ring body 11 is between 1.5mm-3mm, and the interference X formed by the conductive fiber bundle 12 relative to the motor shaft 101 satisfies the condition 0.2L-0.05mm≤X≤0.3L+0.1mm (as shown in Example 1-Example 3), the wear length of the conductive fiber bundle 12 after the motor 100 runs for 200h is less than 0.0146mm, and the shaft voltage on the motor shaft 101 is effectively reduced to below 7.8V. That is, while the conductive fiber bundle 12 of the protective ring 10 of the present application forms a good conductive effect, its service life is also significantly improved, thereby enabling the protective ring 10 of the present application to form a better protective effect on the motor bearing 102. In the comparative examples 4-11 provided in the present application, the conductive properties and wear resistance of the conductive fiber bundle are significantly reduced.

[0136] It should be noted that the present application only takes one possible working embodiment of the motor 100 as an example for illustrative introduction, but does not limit the working embodiment of the motor 100 in the embodiments of the present application to this. At the same time, in the above embodiments, only the possible wear lengths of the conductive fiber bundle 12 under the corresponding working time of the motor 100 are listed, but it does not limit the wear length of the motor 100 under the working time to be the same. The wear length of the conductive fiber bundle 12 varies with the different application scenarios and usage states of the motor 100.

[0137] It should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the embodiments of the present application, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0138] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0139] It should be understood that the application of this application is not limited to the above examples. For ordinary technicians in this field, they can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the claims attached to this application. Ordinary technicians in this field can understand that all or part of the processes of the above embodiments are implemented, and equivalent changes made according to the claims of this application still fall within the scope covered by this application.

Claims

1. A motor, characterized in that: It comprises a motor shaft and a protective ring, wherein the protective ring comprises a ring body and a plurality of conductive fiber bundles, wherein the plurality of conductive fiber bundles are fixed in the ring body, and the plurality of conductive fiber bundles are arranged at intervals along the circumference of the ring body, and the same end of each conductive fiber bundle extends out of the ring body so as to be suitable for contacting the motor shaft; wherein: Along the radial direction of the ring body, the length L of each conductive fiber bundle extending from the ring body is between 1.5 mm and 3 mm, and the width W of the gap between the ring body and the motor shaft satisfies the condition: 0.7L-0.1mm≤W≤0.8L+0.05mm.

2. The motor according to claim 1, characterized in that The ring body comprises a receiving ring and a cover plate, the receiving ring is fixedly connected to the cover plate, and a plurality of mounting grooves are formed on the surface of the receiving ring facing the cover plate; Each of the mounting grooves penetrates the ring body along the radial direction of the ring body, and the conductive fiber bundle is fixed in each of the mounting grooves, wherein the conductive fiber bundle extends out of the ring body from one end of the mounting groove penetrating the ring body.

3. The motor according to claim 2, characterized in that A plurality of fixing tooth groups are protruding from the surface of the cover plate facing the receiving ring. The plurality of fixing tooth groups correspond to the plurality of mounting grooves one by one. The fixing tooth groups are used to fix the conductive fiber bundles in the mounting grooves.

4. The motor according to claim 3, characterized in that Each of the fixed tooth groups is provided with at least two fixed teeth at intervals along the radial direction of the ring body, and the fixed teeth are used to abut and press the conductive fiber bundle.

5. The motor according to any one of claims 2 to 4, characterized in that: The protective ring comprises a plurality of fixing members, which are arranged at intervals along the circumference of the ring body, and each of the fixing members is respectively located between two of the mounting grooves; Along the axial direction of the ring body, each of the fixing members is used to fix the cover plate and the receiving ring.

6. The motor according to any one of claims 2 to 4, characterized in that: A positioning hole and a positioning column that cooperate with each other are provided between the receiving ring and the cover plate, and the positioning column extends into the positioning hole to position the receiving ring and the cover plate.

7. The motor according to claim 1, characterized in that Each of the conductive fiber bundles includes a plurality of conductive fibers, and the conductive fibers extend along a length direction of the conductive fiber bundle.

8. The motor according to claim 7, characterized in that The conductive fiber includes a core, a conductive layer and an adhesive layer, wherein the conductive layer is wrapped around the core, the conductive layer is made of metal, the core is used to support the conductive layer, the adhesive layer is wrapped around the conductive layer, and the adhesive layer is used to bond multiple conductive fibers.

9. The motor according to claim 1, characterized in that The protective ring is sleeved on the outer periphery of the motor shaft, and the conductive fiber bundle extends out of the ring body from the inner circumference of the ring body and contacts the outer circumference of the motor shaft; or, The protective ring is coaxially arranged in the motor shaft, and the conductive fiber bundle extends out of the ring body from the outer peripheral surface of the ring body and contacts with the inner peripheral surface of the motor shaft.

10. An electrical device, characterized in that: Comprising a motor as claimed in any one of claims 1 to 9.

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