A coreless motor and a method for preparing the coreless motor

Abstract

The present invention discloses a coreless motor and a method for preparing the coreless motor, wherein the coreless motor comprises a stator assembly and a rotor assembly, wherein the stator assembly comprises: a support layer, the support layer is sleeved on the outer periphery of the rotor assembly, and a gap is left between the support layer and the rotor assembly; a winding is sleeved on the outer periphery of the support layer, and the inner side wall of the winding is tensioned on the support layer. The provision of the support layer avoids the risk of deformation of the winding during operation, and the risk of friction and short circuit with the magnetic steel in the existing structure where the winding is adjacent to the magnetic steel.

Description

Technical Field

[0001] The invention relates to the technical field of coreless cup motors, and in particular to a coreless cup motor and a method for preparing the coreless cup motor. Background Art

[0002] Compared with traditional slot motors, coreless motors have less torque fluctuation, less back EMF harmonics, higher space utilization, and better performance in terms of control accuracy and output characteristics due to the lack of stator slot structure. Therefore, in recent years, coreless motors have been widely used in various high-precision application scenarios such as life sciences, aviation, medical equipment, and intelligent manufacturing to replace traditional slot motors.

[0003] However, when the coreless motor replaced the slotted motor, the biggest structural change was the stator structure. Since the stator laminations eliminated the slotted structure, the winding lost its support and skeleton, and it was difficult to stabilize the size during the winding process. Therefore, the coreless motor is prone to uncontrollable risks during operation, which seriously affects the stable operation of the motor. Moreover, the replacement and use of the coreless motor is concentrated in motors with a relatively large length-to-diameter ratio, and the two sides of the air gap are the outer circle of the magnetic steel and the inner circle of the winding. The unstable winding structure size will lead to an increase in the eccentricity of the stator and rotor, which can easily bring the risk of steel friction and short circuit to the motor.

[0004] How to solve the above-mentioned technical problems has become a technical problem that needs to be solved urgently in the industry. Summary of the invention

[0005] In order to at least solve the above-mentioned technical problems, the purpose of the present invention is to provide a hollow cup motor, which, through the setting of a supporting layer, avoids the risk of deformation of the winding and friction with the magnetic steel and short circuit during operation in the existing structure where the winding is adjacent to the magnetic steel.

[0006] In order to achieve the above-mentioned object, the hollow cup motor provided in the present application includes a stator assembly and a rotor assembly, and the stator assembly includes:

[0007] A support layer, wherein the support layer is sleeved on the outer periphery of the rotor assembly, and a gap is left between the support layer and the rotor assembly;

[0008] The winding is sleeved on the outer periphery of the supporting layer, and the inner side wall of the winding is stretched on the supporting layer.

[0009] Furthermore, the support layer has two working states: radial contraction and radial expansion;

[0010] When the supporting layer is in a radially contracted working state, the outer diameter of the supporting layer is smaller than the inner diameter of the winding.

[0011] Furthermore, the support layer comprises:

[0012] A body, which is arranged on the outer periphery of the rotor assembly, and a gap is left between the inner side wall of the body and the rotor assembly;

[0013] Multiple groups of adjustment units, each group of adjustment units includes a first adjustment part whose bottom is fixed to the outer wall of the main body and a second adjustment part that cooperates with the first adjustment part. The second adjustment part has the freedom to rotate clockwise and counterclockwise along the central axis of the main body on the surface of the first adjustment part. When the second adjustment part rotates counterclockwise, the distance between the outer wall of the second adjustment part and the main body gradually increases. When the second adjustment part rotates clockwise, the distance between the outer wall of the second adjustment part and the main body gradually decreases. The winding sleeve is arranged on the outer wall of the second adjustment part.

[0014] Furthermore, the support layer is a hollow tubular structure or a centrally symmetrical hollow skeleton structure.

[0015] Furthermore, it also includes: the supporting layer is a non-magnetic conductive material.

[0016] Furthermore, it also includes:

[0017] A protective layer covers the outer side wall of the winding.

[0018] Furthermore, the protective layer is made of non-magnetic conductive material or magnetic conductive material;

[0019] When the supporting layer and the protective layer are both made of non-magnetic conductive materials, the supporting layer and the protective layer are two independent components, or the supporting layer and the protective layer are formed in one piece.

[0020] Furthermore, when the support layer and the protective layer are both made of non-magnetic conductive materials, a magnetic conductive material layer is provided on the outer surface of the protective layer or the inner surface of the protective layer.

[0021] Furthermore, the support layer is connected to one end of the protective layer to form a double-layer cup-shaped structure.

[0022] Furthermore, an outward chamfer is provided at the outer annular opening of the support layer;

[0023] The inner annular opening of the protective layer is provided with an inward chamfer.

[0024] Furthermore, the outer surface of the winding and / or the inner surface of the winding is covered with an insulating layer.

[0025] In order to achieve the above-mentioned purpose, the present application also provides a method for preparing a coreless motor, which is used to assemble a rotor assembly and a stator assembly to form a coreless motor. The method for preparing the stator assembly includes:

[0026] Providing a preformed flexible winding, the flexible winding is a hollow tube structure;

[0027] Providing a support layer, the support layer is a hollow tube structure, and the outer diameter of the support layer is not less than the inner diameter of the flexible winding;

[0028] The flexible winding is sleeved on the outer side wall of the supporting layer.

[0029] Furthermore, the support layer has two working states: contracting radially inward and expanding radially outward. In the working state of contracting radially inward, the outer diameter of the support layer is smaller than the inner diameter of the flexible winding.

[0030] Keep the support layer in a radially inward contraction working state, put the flexible winding on the support layer, and then control the support layer to switch to a radially outward expansion working state. When the flexible winding is in a tensioned state, the support layer stops expanding radially outward and is locked.

[0031] Furthermore, the support layer comprises:

[0032] A body, which is arranged on the outer periphery of the rotor assembly, and a gap is left between the inner side wall of the body and the rotor assembly;

[0033] A plurality of adjustment units, each of which comprises a first adjustment portion whose bottom is fixed to the outer side wall of the body and a second adjustment portion cooperating with the first adjustment portion, the second adjustment portion having a degree of freedom to rotate clockwise and counterclockwise along the central axis of the body on the surface of the first adjustment portion, when the second adjustment portion rotates counterclockwise, the distance between the outer side wall of the second adjustment portion and the body gradually increases, when the second adjustment portion rotates clockwise, the distance between the outer side wall of the second adjustment portion and the body gradually decreases, and the winding is sleeved on the outer side wall of the second adjustment portion;

[0034] The second adjusting part is controlled to rotate counterclockwise, and when the inner side wall of the winding is tensioned on the supporting layer, the second adjusting part stops rotating and is locked.

[0035] Furthermore, a protective layer is provided on the outside of the supporting layer, the protective layer is connected to one side of the supporting layer to form a double-layer cup-shaped structure, a winding gap is provided between the protective layer and the supporting layer, the winding gap size is not less than the thickness size of the flexible winding, and the flexible winding is embedded in the winding gap.

[0036] Furthermore, it also includes:

[0037] The flexible winding sleeved on the support layer is shaped.

[0038] The hollow cup motor of the embodiment of the present application avoids the risk of deformation of the winding and friction with the magnetic steel and short circuit during operation of the existing structure where the winding is adjacent to the magnetic steel by setting the support layer; simplifies the finishing and shaping links in the existing winding manufacturing process, greatly optimizes the manufacturing efficiency of the winding, and reduces the manufacturing cost of the winding; by setting the support layer, because the surface of the support layer is smoother than the surface of the winding in the existing design where the winding is directly adjacent to the magnetic steel, the gap between the support layer and the magnetic steel is smaller, further improving the performance of the motor; through the design of the support layer, the concentricity between the coil and the rotor assembly is easier to control, further reducing the friction problem between the winding and the magnetic steel when the winding is exposed; through the design of the support layer, the use of adhesive glue between the winding and the stator core in the existing design is also reduced, simplifying the process while optimizing the heat dissipation performance of the motor, further improving the reliability of the motor; because the support layer has two working states of radial contraction and radial expansion, it is easier and simpler to set the winding outside the support layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings:

[0040] Figure 1 is an axial cross-sectional view of a coreless motor according to an embodiment of the present application;

[0041] Figure 2 is a schematic structural diagram of a stator assembly of an embodiment of the present application;

[0042] Figure 3 is an axial cross-sectional view of a stator assembly of an embodiment of the present application;

[0043] Figure 4 This is a schematic structural diagram of the support layer in the first working state of an embodiment of the present application;

[0044] Figure 5 is a schematic structural diagram of the support layer in the second working state of an embodiment of the present application;

[0045] Figure 6 It is a schematic flow chart of a method for preparing a stator assembly according to an embodiment of the present application.

[0046] Description of reference numerals:

[0047] 101-shaft; 102-magnetic steel; 103-winding; 104-supporting layer; 1041-main body; 1042-second adjusting part; 1043-first adjusting part; 1044-groove; 105-casing; 106-end cover; 107-first bearing; 108-second bearing; 109-protective layer. DETAILED DESCRIPTION

[0048] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Instead, these embodiments are provided to provide a more thorough and complete understanding of the present application. It should be understood that the drawings and embodiments of the present application are only for exemplary purposes and are not intended to limit the scope of protection of the present application.

[0049] It should be understood that the various steps described in the method implementation of the present application can be performed in different orders and / or performed in parallel. In addition, the method implementation may include additional steps and / or omit the steps shown. The scope of the present application is not limited in this respect.

[0050] The term "including" and its variations used herein are open inclusions, i.e., "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". The relevant definitions of other terms will be given in the following description.

[0051] It should be noted that the modifications of "one" and "plurality" mentioned in this application are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more". "Plurality" should be understood as two or more.

[0052] The hollow cup motor of the embodiment of the present application includes a stator assembly and a rotor assembly. The stator assembly is sleeved on the outer circumference of the rotor assembly and a gap is left between the stator assembly and the rotor assembly. The uniformity of the gap and the size of the gap are important factors in measuring the performance of the hollow cup motor. The hollow cup of the embodiment of the present application effectively improves the uniformity of the gap between the stator assembly and the rotor assembly while further reducing the size of the gap between the stator assembly and the rotor assembly.

[0053] The improvement object in the embodiment of the present application is mainly reflected in the design of the stator assembly, which includes:

[0054] The support layer is a hollow tube structure or other hollow tube-like structures. When the support layer is a skeleton structure, the distances from any two bone strips parallel to the central axis to the central axis are equal; the support layer is sleeved on the outer periphery of the rotor assembly, and a gap is left between the support layer and the rotor assembly;

[0055] The winding is sleeved on the outer periphery of the supporting layer, and the inner surface of the winding is attached to the outer surface of the supporting layer.

[0056] Example 1

[0057] Figure 1 is an axial cross-sectional view of the coreless motor of the embodiment of the present application, Figure 2 is a schematic diagram of the structure of a stator assembly according to an embodiment of the present application, Figure 3 is an axial cross-sectional view of a stator assembly according to an embodiment of the present application, Figure 4 is a schematic structural diagram of the support layer in the first working state of an embodiment of the present application, Figure 5 This is a schematic diagram of the structure of the support layer in the second working state of the embodiment of the present application. Figure 1-5 The coreless cup motor of the embodiment of the present application is described in detail.

[0058] The coreless cup motor of the embodiment of the present application includes a rotor assembly.

[0059] In some exemplary embodiments, the rotor assembly includes a rotating shaft 101 and a magnetic steel 102 .

[0060] In some exemplary embodiments, the rotating shaft 101 is a cylindrical shaft, for example, the rotating shaft 101 is a circular cylindrical shaft.

[0061] In some exemplary embodiments, the rotating shaft 101 may be a metallic or non-metallic cylindrical shaft as required.

[0062] In some exemplary embodiments, the magnetic steel 102 is annularly wrapped around the outside of the rotating shaft 101 .

[0063] In some exemplary embodiments, the magnetic steel 102 is disposed in the middle portion of the rotating shaft 101 , which can be understood as the magnetic steel 102 wrapping around the middle portion of the rotating shaft 101 .

[0064] In some exemplary embodiments, the central axis of the magnetic steel 102 coincides with the central axis of the rotating shaft 101 .

[0065] In some exemplary embodiments, the magnetic steel 102 is bonded to the rotating shaft 101 by glue, and the glue may be quick-drying glue.

[0066] In some exemplary embodiments, the coreless motor of the embodiment of the present application further includes: a stator assembly.

[0067] In some exemplary embodiments, the stator assembly surrounds the rotor assembly, for example, the stator assembly surrounds the rotor assembly in an annular shape.

[0068] In some exemplary embodiments, a central axis of the stator assembly coincides with a central axis of the rotor assembly.

[0069] In some exemplary embodiments, the stator assembly includes: a support layer 104 .

[0070] In some exemplary embodiments, the support layer 104 is in a hollow tube-shaped structure or a structure similar to a hollow tube-shaped structure.

[0071] In some exemplary embodiments, the support layer 104 is a centrally symmetrical hollow skeleton structure, which is similar to a cage structure, except that the support layer 104 in the present application only has side bones and a bottom, and is not a closed cage structure because it lacks a top structure.

[0072] In some exemplary embodiments, when the support layer 104 is a hollow skeleton structure, the bone strips on the side are parallel to the central axis of the support layer 104; and the distances between any two bone strips and the central axis of the support layer 104 are equal.

[0073] In some exemplary embodiments, as needed, a plurality of bone strips are distributed at equal intervals on the side of the support layer 104 .

[0074] In some exemplary embodiments, the support layer 104 surrounds the outer layer of the rotor assembly, that is, the support layer 104 is sleeved on the outer circumference of the rotor assembly.

[0075] In some exemplary embodiments, the central axis of the support layer 104 coincides with the central axis of the rotating shaft 101 ; or in other words, the central axis of the support layer 104 coincides with the central axis of the rotor assembly.

[0076] In some exemplary embodiments, a gap is left between the support layer 104 and the rotor assembly, that is, a gap is provided between the support layer 104 and the magnetic steel 102, and the minimum gap can be 0.1-0.2 mm; of course, according to needs, the gap between the support layer 104 and the magnetic steel 102 can also be 0.2-0.4 mm.

[0077] In some exemplary embodiments, the support layer 104 is made of a non-magnetic conductive material.

[0078] In some exemplary embodiments, when the support layer 104 is made of a non-magnetic material, the material of the support layer 104 can be aluminum, an alloy material, stainless steel, or polytetrafluoroethylene.

[0079] In some exemplary embodiments, the stator assembly further includes a winding 103 .

[0080] In some exemplary embodiments, the winding 103 is sleeved on the outer circumference of the supporting layer 104 .

[0081] In some exemplary embodiments, the inner surface of the winding 103 is attached to the outer surface of the support layer 104 .

[0082] In some exemplary embodiments, the inner sidewalls of the winding 103 are tensioned on the outer surface of the support layer 104 .

[0083] In some exemplary embodiments, the winding 103 is in a hollow tube shape, for example, the winding 103 is in a hollow circular tube shape, or in other words, the winding 103 is in a hollow cylindrical structure.

[0084] In some exemplary embodiments, the inner surface of the winding 103 is attached to the outer surface of the support layer 104 .

[0085] In some exemplary embodiments, in order to facilitate heat dissipation of the winding 103, the side wall of the support layer 104 is preferably designed as a mesh structure. The mesh structure can be understood as a plurality of through holes provided on the side wall of the support layer 104. The provision of the through holes further optimizes the heat dissipation performance of the support layer 104.

[0086] In some exemplary embodiments, the mesh area on the side wall of the support layer 104 accounts for no more than two-thirds of the area on the side wall of the support layer 104 , and the mesh area is usually selected to account for between one-fifth and one-third of the area on the side wall of the support layer 104 .

[0087] In some exemplary embodiments, the mesh holes on the side wall of the support layer 104 can be designed to be evenly distributed on the side wall as needed; or they can be designed to be concentratedly distributed in local areas as needed, that is, the mesh holes are dispersed on the side wall into multiple areas of concentratedly distributed mesh holes.

[0088] In some exemplary embodiments, the support layer 104 has two working states: radial contraction and radial expansion. It can be understood that the support layer 104 has a radial contraction function, such as radial contraction and expansion achieved by rotation.

[0089] In some exemplary embodiments, the support layer 104 includes: a body 1041 .

[0090] In some exemplary embodiments, the body 1041 is disposed on the outer periphery of the rotor assembly, and a gap is left between the inner wall of the body 1041 and the rotor assembly.

[0091] In some exemplary embodiments, the body 1041 is annularly disposed on the outer circumference of the rotor assembly.

[0092] In some exemplary embodiments, the support layer 104 further includes: an adjustment unit.

[0093] In some exemplary embodiments, the adjusting units include a plurality of groups, and each group of adjusting units includes a first adjusting portion 1043 whose bottom is fixed to the outer side wall of the body 1041 .

[0094] In some exemplary embodiments, the first adjusting portion 1043 protrudes from an outer side wall of the body 1041 .

[0095] In some exemplary embodiments, the first adjustment portion 1043 is wedge-shaped in the radial direction of the body 1041 .

[0096] In some exemplary embodiments, the first adjusting portion 1043 is in a strip shape or a discontinuous dot shape in the axial direction of the body 1041 .

[0097] In some exemplary embodiments, when the first adjustment portion 1043 is in the shape of discontinuous dots, a plurality of discontinuous first adjustment portions 1043 are on the same straight line.

[0098] In some exemplary embodiments, the side of the first adjustment portion 1043 facing away from the main body 1041 is a smooth plane, and the side of the first adjustment portion 1043 facing away from the main body 1041 has a plane with a certain inclination angle; the distance between the side of the first adjustment portion 1043 facing away from the main body 1041 and the axis of the main body 1041 gradually increases in a counterclockwise direction.

[0099] In some exemplary embodiments, each group of adjustment units further includes a second adjustment portion 1042 that cooperates with the first adjustment portion 1043 .

[0100] In some exemplary embodiments, the second adjustment portion 1042 fits the first adjustment portion 1043 .

[0101] In some exemplary embodiments, multiple groups of adjustment units are distributed around the body 1041 at equal intervals.

[0102] In some exemplary embodiments, the plurality of first adjustment portions 1043 are distributed at equal intervals on the outside of the body 1041 , and the plurality of first adjustment portions 1043 have the same inclination direction.

[0103] In some exemplary embodiments, a surface of the second adjusting portion 1042 facing away from the main body 1041 is an arc-shaped surface.

[0104] In some exemplary embodiments, the second adjustment portion 1042 has the freedom to rotate clockwise and counterclockwise along the central axis of the main body 1041 on the surface of the first adjustment portion 1043. When the second adjustment portion 1042 rotates counterclockwise, the distance between the outer wall of the second adjustment portion 1042 and the main body 1041 gradually increases. When the second adjustment portion 1042 rotates clockwise, the distance between the outer wall of the second adjustment portion 1042 and the main body 1041 gradually decreases.

[0105] In some exemplary embodiments, the winding 103 is sleeved on an outer side wall of the second adjustment portion 1042 .

[0106] In some exemplary embodiments, the second adjustment portion 1042 may be designed to be in the shape of an elongated strip or a long sheet as a whole as needed, that is, the second adjustment portion 1042 is in the shape of a strip or a long sheet in the axial direction of the body 1041 .

[0107] In some exemplary embodiments, as needed, the second adjustment portion 1042 may also be wedge-shaped in the radial direction of the body 1041 . When the first adjustment portion 1043 and the second adjustment portion 1042 are both wedge-shaped, the wedges of the two portions are oriented in opposite directions.

[0108] In some exemplary embodiments, as needed, the second adjusting portion 1042 is extended as a whole, and the extended portion of the second adjusting portion 1042 protrudes outside the main body 1041 , thereby facilitating the rotation of the second adjusting portion 1042 .

[0109] In some exemplary embodiments, as needed, a groove 1044 may be provided at one axial end of the body 1041 , and the groove 1044 is disposed on the inner side of the body 1041 . Of course, the groove 1044 may also be disposed between the inner and outer walls of the body 1041 as needed.

[0110] In some exemplary embodiments, when adjusting the distance between the outer wall of the second adjustment portion 1042 and the body 1041, the external structure can be inserted into the groove 1044, and the tension state of the winding 103 sleeved on the outer wall of the second adjustment portion 1042 can be adjusted by rotating the groove 1044, such as Figure 5 shown.

[0111] In some exemplary embodiments, when the adjustment portion on the outer wall of the main body 1041 is provided with a plurality of gradient adjustment portions according to the same change trend, a step is provided between adjacent first adjustment portions 1043 on the outer wall of the main body 1041 in the same group of adjustment units, that is, the head of the first adjustment portion 1043 in two adjacent adjustment units is higher than the tail of another adjacent first adjustment portion 1043, and the height here refers to the dimension value of the outer side of the first adjustment portion 1043 from the main body 1041.

[0112] In some exemplary embodiments, as needed, the length dimension of the second adjustment portion 1042 can be the same as the axial height of the main body 1041, or the length dimension of the second adjustment portion 1042 can be slightly smaller than the axial height of the main body 1041. Of course, the length dimension of the second adjustment portion 1042 can also be slightly larger than the axial height of the main body 1041.

[0113] In some exemplary embodiments, adjustment of the rotation of the second adjustment portion 1042 can be achieved by means of an auxiliary tool; of course, the tail of the second adjustment portion 1042 can also be fixed together, and the tail of the second adjustment portion 1042 and the axial tail of the main body 1041 are on the same axial side of the main body 1041; for example, a fixing ring is provided at the tail of the second adjustment portion 1042, and the fixing ring connects the tail of the second adjustment portion 1042 together, and the rotation of the second adjustment portion 1042 is achieved by rotating the fixing ring; of course, according to needs, it can also be designed to achieve relative rotation of the second adjustment portion 1042 by rotating the main body 1041.

[0114] In some exemplary embodiments, multiple groups of adjustment units are distributed around the body 1041 at equal intervals.

[0115] In some exemplary embodiments, the second adjustment portion 1042 has the freedom to rotate clockwise and counterclockwise on the surface of the first adjustment portion 1043 along the central axis of the main body 1041; that is, the second adjustment portion 1042 can rotate in clockwise and counterclockwise directions relative to the first adjustment portion 1043, and the specific rotation angle can be set according to actual needs.

[0116] In some exemplary embodiments, when the second adjusting portion 1042 rotates counterclockwise, the distance between the outer side wall of the second adjusting portion 1042 and the body 1041 gradually increases. Figure 5 shown.

[0117] In some exemplary embodiments, when the second adjusting portion 1042 rotates clockwise, the distance between the outer side wall of the second adjusting portion 1042 and the body 1041 gradually decreases. Figure 4 shown.

[0118] In some exemplary embodiments, the second adjusting portion 1042 is controlled to rotate counterclockwise, and when the inner wall of the winding 103 is tensioned on the supporting layer 104 , the second adjusting portion 1042 stops rotating and is locked.

[0119] In some exemplary embodiments, when the inner wall of the winding 103 is in a state of being tensioned against the outer wall of the supporting layer 104, the position of the second adjustment portion 1042 relative to the main body 1041 is locked. A clamping device for limiting the position of the main body 1041 can be provided at the tail of the second adjustment portion 1042 as needed. For example, when the tail of the second adjustment portion 1042 is connected by a fixing ring, a limiting rod is provided between the fixing ring and the main body 1041, and both the fixing ring and the main body 1041 are provided with positioning holes. The bent portions at both ends of the limiting rod are respectively connected to the positioning holes on the fixing ring and the positioning holes on the main body 1041 to lock the position, and the structure of the limiting rod is similar to that of a U-shaped nail used in a stapler.

[0120] In some exemplary embodiments, the winding 103 is sleeved on an outer side wall of the second adjustment portion 1042 .

[0121] In some exemplary embodiments, when the support layer 104 is in a radially contracted working state, the outer diameter of the radial cross-section of the support layer 104 is smaller than the inner diameter of the radial cross-section of the winding 103; or it can be understood that when the support layer 104 is in a radially contracted working state, the outer diameter of the support layer 104 will shrink to be smaller than the inner diameter of the winding 103.

[0122] In some exemplary embodiments, when the support layer 104 is in a radially expanding working state, the support layer 104 will continue to expand until the outer diameter of the support layer 104 is equal to the inner diameter of the winding 103, that is, when the support layer 104 enters the radial expansion state, the winding 103 will enter a tensioned state until the outer wall of the support layer 104 is tightly fitted with the inner wall of the winding 103.

[0123] In some exemplary embodiments, optionally, an insulating layer is provided between the winding 103 and the supporting layer 104 .

[0124] In some exemplary embodiments, the insulating layer between the winding 103 and the supporting layer 104 can be achieved by disposing insulating varnish on the winding 103 to achieve insulation between the winding 103 and the supporting layer 104, for example, the winding 103 is composed of enameled wire; of course, in order to enhance the insulation effect between the winding 103 and the supporting layer 104, insulating varnish and an insulating layer can also be used at the same time, for example, after the winding 103 is composed of enameled wire, an insulating layer is arranged between the winding 103 and the supporting layer 104.

[0125] In some exemplary embodiments, the insulating layer between the winding 103 and the supporting layer 104 may be formed by coating insulating glue or attaching insulating tape.

[0126] In some exemplary embodiments, a protective layer 109 may be optionally provided on the outer side of the winding 103 .

[0127] In some exemplary embodiments, the protective layer 109 may be formed by coating an insulating protective adhesive on the outer surface of the winding 103 , or may be an independent protective layer component attached to the outer surface of the winding 103 .

[0128] In some exemplary embodiments, the protective layer 109 is in the shape of a hollow tube and surrounds the outer wall surface of the winding 103 .

[0129] In some exemplary embodiments, optionally, an insulating layer is also provided between the protective layer 109 and the winding 103, or it can be understood that the outer surface of the winding 103 and / or the inner surface of the winding 103 is covered with an insulating layer; the structure of the insulating layer can be the same as the insulating layer between the winding 103 and the supporting layer 104, or it can be an insulating layer made of different materials.

[0130] In some exemplary embodiments, when the protective layer 109 is not formed by coating the outer surface of the winding 103 with insulating protective glue, the protective layer 109 can be an independent component, and the protective layer 109 can also be integrally formed with the supporting layer 104 .

[0131] In some exemplary embodiments, the support layer 104 and one end of the protective layer 109 are connected and combined together to form a double-layer cup-shaped structure.

[0132] In some exemplary embodiments, the annular opening on the outside of the support layer 104 is provided with an outward chamfer, and the annular opening on the inside of the protective layer 109 is provided with an inward chamfer; it can be understood that the entrance of the double-layer cup-shaped structure composed of the support layer 104 and the protective layer 109 is enlarged, thereby facilitating the placement of the winding 103 into the chamber of the double-layer cup-shaped structure composed of the support layer 104 and the protective layer 109, and the chamber is surrounded by the connecting ends of the support layer 104 and the protective layer 109, the outer wall of the support layer 104 and the inner wall of the protective layer 109.

[0133] In some exemplary embodiments, the winding 103 in a shaped or unshaped state can be sleeved on the outer layer of the support layer 104. When the winding 103 sleeved on the outer layer of the support layer 104 is in an unshaped state, the unshaped winding 103 after sleeved is also subjected to shaping treatment.

[0134] In some exemplary embodiments, the winding 103 in an unshaped state, that is, the winding in a flexible state, is selected in order to facilitate placing the winding 103 in a chamber of a double-layer cup-shaped structure composed of a support layer 104 and a protective layer 109; after placing the winding 103 in an unshaped state in the chamber of a double-layer cup-shaped structure composed of a support layer 104 and a protective layer 109, the unshaped winding 103 in the chamber is subjected to shaping treatment.

[0135] In some exemplary embodiments, when the support layer 104 and the protective layer 109 are made of the same material, the support layer 104 and the protective layer 109 can be a whole, that is, the two are integrally formed, or the support layer 104 and the protective layer 109 can be two independent components that can be assembled together.

[0136] In some exemplary embodiments, when the support layer 104 and the protective layer 109 are made of different materials, the support layer 104 and the protective layer 109 are an assembled structure.

[0137] In some exemplary embodiments, the protective layer 109 may be made of a non-magnetic conductive material, a magnetic conductive material, or a super-magnetic conductive material.

[0138] In some exemplary embodiments, when the protective layer 109 is made of a non-magnetic material, the material of the protective layer 109 can be aluminum, alloy, stainless steel, or polytetrafluoroethylene.

[0139] In some exemplary embodiments, when the protective layer 109 is made of non-magnetic material, there is no need to provide a housing 105; if a housing 105 is provided, the protective layer 109 can be directly attached to the housing 105, or an insulating layer can be provided between the protective layer 109 and the housing 105.

[0140] In some exemplary embodiments, when the support layer 104 and the protective layer 109 are both made of non-magnetic conductive materials, a magnetic conductive material layer is provided on the outer surface of the protective layer 109 or the inner surface of the protective layer 109 .

[0141] In some exemplary embodiments, when the protective layer 109 is made of a magnetic conductive material or a supermagnetic conductive material, and when the outer layer of the protective layer 109 further includes the housing 105 , an insulating layer is provided between the protective layer 109 and the housing 105 .

[0142] In some exemplary embodiments, when the protective layer 109 is made of a superconducting magnetic material, the magnetic permeability of the superconducting magnetic material is 35μ-100μ, for example, the magnetic permeability is 35μ, 40μ, and 100μ, etc., and the magnetic steel performance loss rate of the superconducting magnetic material does not exceed 5%.

[0143] In some exemplary embodiments, the magnetic conductive material is, for example, silicon steel sheets, and the silicon steel sheets include 20 silicon steel sheets, 35 silicon steel sheets, and 50 silicon steel sheets.

[0144] In some exemplary embodiments, when the housing 105 is provided, the housing 105 is a hollow tubular structure with one side open, or the housing 105 is a hollow tubular structure with two sides open.

[0145] In some exemplary embodiments, as needed, when the casing 105 is a hollow tubular structure with one side open, the supporting layer 104 and the protective layer 109 may also both be hollow tubular structures, and the winding 103 placed in the gap between the outer wall of the supporting layer 104 and the inner wall of the protective layer 109 is in contact with the non-opening side of the casing 105 through an insulating pad, and the non-opening side of the casing 105 corresponds to the opening side of the casing 105; or it can be understood that the supporting layer 104 and the protective layer 109 are both hollow tubular structures, and an insulating pad is provided at the contact portion between the gap between the two and the casing 105, so that the winding 103 and the non-opening side of the casing 105 remain insulated.

[0146] In some exemplary embodiments, when the casing 105 is a hollow tubular structure with openings on both sides, the supporting layer 104 and the protective layer 109 can also both be hollow tubular structures, and the winding 103 placed in the gap between the outer wall of the supporting layer 104 and the inner wall of the protective layer 109 is in contact with the end cover at one end of the casing 105 through an insulating pad.

[0147] In some exemplary embodiments, when the housing 105 is a hollow tubular structure with one side open, a gap is provided between the stator assembly and the end cover 106 located on the open side, that is, the end cover 106 is not in contact with the stator assembly.

[0148] In some exemplary embodiments, when the housing 105 is in a hollow tubular structure with one side open, a first bearing chamber is provided in a central area of ​​a non-opening side of the housing 105 corresponding to the open side.

[0149] In some exemplary embodiments, the first end of the rotating shaft 101 extends out from the housing 105 through the first bearing chamber.

[0150] In some exemplary embodiments, the first bearing chamber is provided with a first bearing 107 .

[0151] In some exemplary embodiments, the first end of the rotating shaft 101 is connected to the housing 105 via a first bearing 107 .

[0152] In some exemplary embodiments, the first end of the rotating shaft 101 and the first bearing 107 are clearance-fitted.

[0153] In some exemplary embodiments, an end cover 106 is disposed on the open side of the housing 105 .

[0154] In some exemplary embodiments, the end cap 106 is, for example, a flange.

[0155] In some exemplary embodiments, a second bearing chamber is disposed in a central area of ​​the end cover 106 .

[0156] In some exemplary embodiments, the second bearing chamber is provided with a second bearing 108 .

[0157] In some exemplary embodiments, as needed, the size of the first bearing 107 can be the same as the size of the second bearing 108, that is, the first bearing 107 and the second bearing 108 can be bearings of the same size; of course, as needed, the sizes of the first bearing 107 and the second bearing 108 can also be different.

[0158] In some exemplary embodiments, the second end of the rotating shaft 101 extends out from the housing 105 through the second bearing chamber.

[0159] In some exemplary embodiments, the second end of the rotating shaft 101 and the second bearing 108 are clearance-fitted.

[0160] In some exemplary embodiments, the winding 103 is a single-layer winding or a multi-layer winding.

[0161] In some exemplary embodiments, when the casing 105 is a hollow tubular structure with openings on both sides, end covers are provided at both end openings of the casing 105 to match the casing 105, bearing chambers are provided in the two end covers and bearings are installed in the bearing chambers, and the rotating shaft 101 is connected to the bearings located in the two end covers and extends from the casing 105.

[0162] In some exemplary embodiments, the size of the bearing matches the size of the shaft 101 .

[0163] Example 2

[0164] Figure 1 is an axial cross-sectional view of the coreless motor of the embodiment of the present application, Figure 2 is a schematic diagram of the structure of a stator assembly according to an embodiment of the present application, Figure 3 is an axial cross-sectional view of a stator assembly according to an embodiment of the present application, Figure 4 is a schematic structural diagram of the support layer in the first working state of an embodiment of the present application, Figure 5 is a schematic structural diagram of the support layer in the second working state of an embodiment of the present application, Figure 6 This is a schematic diagram of the preparation method of the stator assembly of the embodiment of the present application. Figure 1-6 , the preparation method process of the hollow cup motor of the embodiment of the present application is described in detail.

[0165] Example 2 is a method for preparing a hollow cup motor. The method for preparing a hollow cup motor in the embodiment of the present application is applied to the hollow cup motor in the above embodiment, or it can be understood that the hollow cup motor in Example 1 is prepared using the method for preparing a hollow cup motor in the embodiment of the present application.

[0166] The method for preparing a coreless motor according to an embodiment of the present application is used to assemble a rotor assembly and a stator assembly to form a coreless motor.

[0167] In the method for preparing a stator assembly, first, in step 201, a preformed flexible winding is provided, and the flexible winding is a hollow tubular structure.

[0168] In some exemplary embodiments, the flexible winding, ie, the winding that is not fully formed, has a structure similar to a hollow cylindrical structure, or a hollow tubular structure, for example, the flexible winding is a hollow circular tubular structure.

[0169] Step 202, providing a support layer, the support layer is a hollow tubular structure, and the outer diameter of the support layer is not less than the inner diameter of the flexible winding.

[0170] In some exemplary embodiments, the support layer 104 is used to provide support for the flexible winding, and the support layer 104 has a hollow tube structure.

[0171] In some exemplary embodiments, the support layer 104 is in the shape of a hollow cylindrical tube.

[0172] In some exemplary embodiments, as needed, the support layer 104 can also be a centrally symmetrical hollow skeleton structure. The hollow skeleton structure is similar to a cage structure, except that the support layer 104 in the present application only has side bone bars and connecting parts between the bone bars, and is not a closed cage structure because the support layer 104 lacks a top structure.

[0173] In some exemplary embodiments, the connecting portion between the bone bars is, for example, an annular connecting portion that simultaneously connects a plurality of bone bars, and there may be one or more annular connecting portions; the connecting portion may also be designed so that adjacent connecting portions between the bone bars are not in the same horizontal plane.

[0174] In some exemplary embodiments, when the support layer 104 is a hollow skeleton structure, the bone strips on the side are parallel to the central axis of the support layer 104; and the distances between any two bone strips and the central axis of the support layer 104 are equal.

[0175] In some exemplary embodiments, as needed, a plurality of bone strips are distributed at equal intervals on the side of the support layer 104 .

[0176] In some exemplary embodiments, the outer diameter of the support layer 104 is not less than the inner diameter of the flexible winding; or it can be understood that the outer circumference of the radial cross section of the support layer 104 is not less than the inner circumference of the radial cross section of the flexible winding.

[0177] In some exemplary embodiments, the outer diameter of the support layer 104 is not less than the inner diameter of the flexible winding, that is, the outer diameter of the support layer 104 is equal to the inner diameter of the flexible winding, or the outer diameter of the support layer 104 is slightly larger than the inner diameter of the flexible winding.

[0178] In some exemplary embodiments, the outer diameter of the support layer 104 is slightly larger than the inner diameter of the flexible winding, for example, the outer diameter of the support layer 104 is 0.1-1 cm larger than the inner diameter of the flexible winding.

[0179] In some exemplary embodiments, the outer circumference of the radial cross-section of the support layer 104 is not less than the inner circumference of the radial cross-section of the flexible winding, that is, the outer circumference of the radial cross-section of the support layer 104 is slightly larger than the inner circumference of the cross-section of the flexible winding, or the outer circumference of the radial cross-section of the support layer 104 is equal to the inner circumference of the radial cross-section of the flexible winding.

[0180] In some exemplary embodiments, the outer circumference of the radial cross section of the support layer 104 is slightly larger than the inner circumference of the cross section of the flexible winding, for example, the outer circumference of the radial cross section of the support layer 104 is 0.3-3 cm larger than the inner circumference of the radial cross section of the flexible winding.

[0181] Step 203: sleeve the flexible winding on the outer wall of the support layer.

[0182] In some exemplary embodiments, after the flexible winding is sleeved on the outer side wall of the support layer 104 , the inner side wall of the flexible winding is made to fit with the outer side wall of the support layer 104 .

[0183] In some exemplary embodiments, in order to facilitate the flexible winding to be sleeved on the outer wall of the support layer 104, an outward chamfer is provided at the annular opening of the outer wall of the support layer 104. This design increases the inlet width of the flexible winding when sleeved, and facilitates the flexible winding to be sleeved on the support layer 104. Figure 2-3 shown.

[0184] In some exemplary embodiments, the support layer 104 has two working states of radially contracting inward and radially expanding outward, that is, when the outer diameter of the support layer 104 is selected to be slightly larger than the inner diameter of the flexible winding, the support layer 104 is designed to have the function of radially adjusting the diameter size.

[0185] In some exemplary embodiments, when the support layer 104 is in a working state of radially contracting inward, the outer diameter of the support layer 104 is smaller than the inner diameter of the flexible winding; the support layer 104 is kept in a working state of radially contracting inward, the flexible winding is sleeved on the support layer 104, and then the support layer 104 is controlled to switch to a working state of radially expanding outward, and when the flexible winding is in a tensioned state, the support layer 104 stops expanding radially outward and is locked.

[0186] In some exemplary embodiments, when the support layer 104 expands radially outward so that the flexible winding is in a tensioned state, that is, the outer wall of the support layer 104 fits the inner wall of the flexible winding, or it can be understood that the circumference of the outer wall of the radial cross-section of the support layer 104 is equal to the circumference of the radial cross-section of the flexible winding.

[0187] In some exemplary embodiments, the support layer 104 includes: a body 1041 .

[0188] In some exemplary embodiments, the body 1041 is disposed on the outer periphery of the rotor assembly, and a gap is left between the inner wall of the body 1041 and the rotor assembly.

[0189] In some exemplary embodiments, the body 1041 is annularly disposed on the outer circumference of the rotor assembly.

[0190] In some exemplary embodiments, the support layer 104 further includes: an adjustment unit.

[0191] In some exemplary embodiments, the adjustment unit includes multiple groups, each group of adjustment units includes a first adjustment portion 1043 fixed at the bottom to the outer wall of the body 1041 and a second adjustment portion 1042 matched with the first adjustment portion 1043. Figure 4-5 shown.

[0192] In some exemplary embodiments, the first adjustment portion 1043 is a protrusion having a certain inclination angle on a side facing away from the body 1041 , and the inclination angle of the second adjustment portion 1042 matches the inclination angle of the first adjustment portion 1043 .

[0193] In some exemplary embodiments, the second adjustment portion 1042 fits the first adjustment portion 1043 .

[0194] In some exemplary embodiments, the second adjustment portion 1042 has the freedom to rotate clockwise and counterclockwise along the central axis of the main body 1041 on the surface of the first adjustment portion 1043. When the second adjustment portion 1042 rotates counterclockwise, the distance between the outer wall of the second adjustment portion 1042 and the main body 1041 gradually increases. When the second adjustment portion 1042 rotates clockwise, the distance between the outer wall of the second adjustment portion 1042 and the main body 1041 gradually decreases.

[0195] In some exemplary embodiments, multiple groups of adjustment units are distributed around the body 1041 at equal intervals.

[0196] In some exemplary embodiments, the plurality of first adjustment portions 1043 are distributed at equal intervals on the outside of the body 1041 , and the plurality of first adjustment portions 1043 have the same inclination direction.

[0197] In some exemplary embodiments, when the plurality of first adjustment portions 1043 are distributed at equal intervals on the outside of the body 1041 , the outside of the body 1041 as a whole presents a regular ups and downs pattern.

[0198] In some exemplary embodiments, the winding 103 is sleeved on an outer side wall of the second adjustment portion 1042 .

[0199] In some exemplary embodiments, the second adjusting portion 1042 may be designed to be in the shape of an elongated strip or sheet as a whole as required.

[0200] In some exemplary embodiments, as needed, the second adjusting portion 1042 may be extended as a whole, and the extended portion of the second adjusting portion 1042 may protrude from the main body 1041 , thereby facilitating the rotation of the second adjusting portion 1042 .

[0201] In some exemplary embodiments, as needed, a groove 1044 may be provided at one axial end of the body 1041 , and the groove 1044 is disposed on the inner side of the body 1041 . Of course, the groove 1044 may also be disposed between the inner and outer walls of the body 1041 as needed.

[0202] In some exemplary embodiments, when adjusting the distance between the outer wall of the second adjustment portion 1042 and the body 1041, the external structure can be inserted into the groove 1044, and the tension state of the winding 103 sleeved on the outer wall of the second adjustment portion 1042 can be adjusted by rotating the groove 1044, such as Figure 5 shown.

[0203] In some exemplary embodiments, the rotation of the second adjusting portion 1042 can be adjusted by means of an auxiliary tool. Of course, the tail of the second adjusting portion 1042 can also be fixed together. For example, a fixing ring is provided at the tail of the second adjusting portion 1042, and the fixing ring connects the tail of the second adjusting portion 1042 together, and the rotation of the second adjusting portion 1042 is achieved by rotating the fixing ring. Of course, according to needs, it can also be designed to achieve relative rotation of the second adjusting portion 1042 by rotating the main body 1041, or to achieve relative rotation by rotating the main body 1041 and the second adjusting portion 1042 at the same time.

[0204] In some exemplary embodiments, the second adjustment parts 1042 can also be inserted one by one into the corresponding positions of the first adjustment parts 1043 after the flexible winding is sleeved on the outside of the main body 1041; that is, there are multiple second adjustment parts 1042 at this time, and the second adjustment parts 1042 are independent and unconnected individuals; when the tails of the second adjustment parts 1042 are connected, at least adjacent second adjustment parts 1042 are connected in pairs, and the second adjustment parts 1042 can be matched with the main body 1041 first, and then the flexible winding can be sleeved.

[0205] In some exemplary embodiments, multiple groups of adjustment units are distributed around the body 1041 at equal intervals.

[0206] In some exemplary embodiments, the second adjustment portion 1042 has the freedom to rotate clockwise and counterclockwise on the surface of the first adjustment portion 1043 along the central axis of the main body 1041; that is, the second adjustment portion 1042 can rotate in clockwise and counterclockwise directions relative to the first adjustment portion 1043, and the specific rotation angle can be set according to actual needs.

[0207] In some exemplary embodiments, when the second adjusting portion 1042 rotates counterclockwise, the distance between the outer side wall of the second adjusting portion 1042 and the body 1041 gradually increases. Figure 5 shown.

[0208] In some exemplary embodiments, when the second adjusting portion 1042 rotates clockwise, the distance between the outer side wall of the second adjusting portion 1042 and the body 1041 gradually decreases. Figure 4 shown.

[0209] In some exemplary embodiments, the second adjustment portion 1042 is controlled to rotate counterclockwise, and when the inner side wall of the flexible winding is tensioned on the support layer 104 , the second adjustment portion 1042 stops rotating and is locked.

[0210] In some exemplary embodiments, when the inner wall of the winding 103 is in a state of being tensioned against the outer wall of the supporting layer 104, the position of the second adjustment portion 1042 relative to the main body 1041 is locked, and a clamping device for limiting the position of the main body 1041 can be provided at the tail of the adjustment portion as needed. For example, when the tail of the second adjustment portion 1042 is connected by a fixing ring, a limiting rod is provided between the fixing ring and the main body 1041, and both the fixing ring and the main body 1041 are provided with positioning holes, and both ends of the limiting rod are respectively connected to the fixing ring and the positioning holes on the main body 1041 to lock the position, and the structure of the limiting rod is similar to that of a U-shaped nail used in a stapler.

[0211] In some exemplary embodiments, as needed, when the main body 1041 and the second adjusting part 1042 are steplessly adjusted, the main body 1041 and the second adjusting part 1042 can also be locked by a third locking mechanism of any form. For example, when the second adjusting part 1042 is rotated so that the winding 103 is in a tensioned state, the relative position between the current main body 1041 and the second adjusting part 1042 is fixed by the third locking mechanism.

[0212] In some exemplary embodiments, when the support layer 104 expands radially outward so that the flexible winding is in a tensioned state, the flexible winding sleeved on the support layer 104 is further subjected to a shaping process.

[0213] In some exemplary embodiments, a protective layer 109 is disposed outside the support layer 104 , and the protective layer 109 is connected to one side of the support layer 104 to form a double-layer cup-shaped structure.

[0214] In some exemplary embodiments, a winding gap is provided between the protective layer 109 and the supporting layer 104, the size of the winding gap is not less than the thickness of the flexible winding, and the flexible winding is embedded in the winding gap; or it can be understood that the flexible winding is embedded in the gap of the double-layer cup-shaped structure formed by the protective layer 109 and the supporting layer 104.

[0215] In some exemplary embodiments, when the flexible winding is embedded in the winding gap and the flexible winding is in a tensioned state, a shaping process is performed on the flexible winding sleeved on the support layer 104 .

[0216] In some exemplary embodiments, the method for preparing a coreless motor according to an embodiment of the present application further includes preparing a rotor assembly:

[0217] First, the shaft and the magnet are bonded together to form a rotor assembly.

[0218] In some exemplary embodiments, the magnetic steel 102 is annularly wrapped around the outer layer of the rotating shaft 101 .

[0219] In some exemplary embodiments, the magnetic steel 102 is disposed in the middle portion of the rotating shaft 101 .

[0220] In some exemplary embodiments, the magnet 102 is bonded to the shaft 101 by glue, such as quick-drying glue, which is applied to one end of the shaft 101. The inner hole of the magnet 102 is then aligned with the shaft 101 coated with glue and screwed into a fixed position to form a rotor assembly.

[0221] In some exemplary embodiments, the support layer 104 is made of a non-magnetic conductive material.

[0222] In some exemplary embodiments, the protective layer 109 may be made of a non-magnetic conductive material, a magnetic conductive material, or a super-magnetic conductive material.

[0223] In some exemplary embodiments, when the support layer 104 and the protective layer 109 are both made of non-magnetic conductive materials, the support layer 104 and the protective layer 109 can be integrally formed or can be two separate components.

[0224] In some exemplary embodiments, when the support layer 104 and the protective layer 109 are combined together, they form a double-layer cup-shaped structure.

[0225] In some exemplary embodiments, when the support layer 104 and the protective layer 109 are integrally formed, the flexible winding in an unshaped state is placed in a chamber formed by the support layer 104 and the protective layer 109, and then the flexible winding in the chamber is shaped.

[0226] In some exemplary embodiments, when the supporting layer 104 and the protective layer 109 are two independent components, the flexible winding in an unshaped state can be first wrapped around the outer layer of the supporting layer 104, the flexible winding can be shaped first, and then the protective layer 109 can be arranged on the outer layer of the flexible winding; when the supporting layer 104 and the protective layer 109 are two independent components, the flexible winding in an unshaped state can be first wrapped around the outer layer of the supporting layer 104, and then the protective layer 109 can be arranged on the outer layer of the flexible winding, and finally the flexible winding can be shaped.

[0227] In some exemplary embodiments, the shaping process of the flexible winding may be to place the flexible winding together with the support layer 104 in a temperature oven for baking and shaping, or to place the flexible winding in a temperature oven for baking and shaping after the flexible winding, the support layer 104 and the protective layer 109 are all bonded together; or the flexible winding, the support layer 104, the protective layer 109 and the housing 105 are connected and then placed in a temperature oven for baking and shaping.

[0228] In some exemplary embodiments, when the protective layer 109 is made of superconducting magnetic material, an insulating layer is also provided between the protective layer 109 and the casing 105; of course, when the protective layer 109 is made of non-magnetic material, an insulating layer can also be provided between the protective layer 109 and the casing 105 as needed.

[0229] When the casing is a hollow tubular structure with one side open, bearings are respectively installed in the bearing chamber on the non-open side of the casing corresponding to the open end and the bearing chamber on the end cover.

[0230] In some exemplary embodiments, in order to facilitate the distinction between the two bearing chambers and bearings, in the embodiment of the present application, the bearing chamber at the end of the casing 105 is referred to as the first bearing chamber, and the bearing chamber on the end cover 106 is referred to as the second bearing chamber, and the first bearing 107 and the second bearing 108 are pressed into the first bearing chamber and the second bearing chamber, respectively.

[0231] In some exemplary embodiments, the first bearing 107 and the first bearing chamber are interference fit, and the second bearing 108 and the second bearing chamber are interference fit.

[0232] In some exemplary embodiments, the rotating shaft 101 is first assembled with the bearing in the first bearing chamber, and then the bearing on the end cover 106 is assembled on the rotating shaft 101; of course, as needed, the bearing on the end cover 106 can also be assembled with the rotating shaft 101 first, and then the rotating shaft 101 and the bearing on the housing 105 can be assembled.

[0233] Fit the end cap onto the housing.

[0234] In some exemplary embodiments, when the end cover 106 is connected to the rotating shaft 101 , the end cover 106 is also interference-fitted with the housing 105 .

[0235] In some exemplary embodiments, optionally, a sealant is applied at the joint between the end cover 106 and the housing 105 .

[0236] In some exemplary embodiments, when the housing 105 is a hollow tubular structure with openings on both sides, an end cover is provided at each of the openings on both sides of the housing 105, and a bearing chamber is provided on each of the two end covers. Bearings are correspondingly installed on the bearing chambers, and the size of the bearings matches the size of the rotating shaft 101.

[0237] In some exemplary embodiments, after the bearing is installed in the bearing chamber, the bearings on the two end covers are assembled with the rotating shaft 101 respectively, or the bearing on one end cover is assembled with the rotating shaft 101 and the end cover is assembled with the housing 105 before installing the other end cover.

[0238] Although the embodiments disclosed in the present invention are as above, the contents are only embodiments adopted to facilitate understanding of the present invention and are not intended to limit the present invention. Any technician in the field to which the present invention belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in the present invention, but the patent protection scope of the present invention shall still be subject to the scope defined in the attached claims.

Claims

1. A coreless motor, comprising a stator assembly and a rotor assembly, It is characterized in that The stator assembly comprises: A support layer, wherein the support layer is sleeved on the outer circumference of the rotor assembly, and a gap is left between the support layer and the rotor assembly; A winding, wherein the winding is sleeved on the outer periphery of the supporting layer; The support layer has two working states: radial contraction and radial expansion; When the support layer is in a radially contracted working state, the outer diameter of the support layer is smaller than the inner diameter of the winding; When the support layer is in a radially expanded state, the inner side wall of the winding is tensioned on the support layer.

2. The coreless motor according to claim 1, It is characterized in that The support layer comprises: A body, wherein the body is disposed on the outer periphery of the rotor assembly, and a gap is left between the inner side wall of the body and the rotor assembly; Multiple groups of adjustment units, each group of adjustment units includes a first adjustment part with a bottom fixed to the outer side wall of the main body and a second adjustment part cooperating with the first adjustment part, the second adjustment part has the freedom to rotate clockwise and counterclockwise along the central axis of the main body on the surface of the first adjustment part, when the second adjustment part rotates counterclockwise, the distance between the outer side wall of the second adjustment part and the main body gradually increases, when the second adjustment part rotates clockwise, the distance between the outer side wall of the second adjustment part and the main body gradually decreases, and the winding sleeve is arranged on the outer side wall of the second adjustment part.

3. The coreless motor according to claim 1, It is characterized in that The support layer is a hollow tubular structure or a centrally symmetrical hollow skeleton structure.

4. The coreless motor according to claim 1, It is characterized in that The supporting layer is made of non-magnetic conductive material.

5. The coreless motor according to claim 4, It is characterized in that Also included are: A protective layer covers the outer side wall of the winding.

6. The coreless motor according to claim 5, It is characterized in that The protective layer is made of non-magnetic conductive material or magnetic conductive material; When the supporting layer and the protective layer are both made of non-magnetic conductive materials, the supporting layer and the protective layer are two independent components, or the supporting layer and the protective layer are formed in one piece.

7. The coreless motor according to claim 6, It is characterized in that When the support layer and the protective layer are both made of non-magnetic conductive materials, a magnetic conductive material layer is provided on the outer surface of the protective layer or the inner surface of the protective layer.

8. The coreless motor according to claim 7, It is characterized in that The support layer is connected to one end of the protective layer to form a double-layer cup-shaped structure.

9. The coreless motor according to claim 8, It is characterized in that An outward chamfer is provided at the outer annular opening of the support layer; An inward chamfer is arranged at the inner annular opening of the protective layer.

10. The coreless motor according to claim 8, It is characterized in that The outer surface of the winding and / or the inner surface of the winding is covered with an insulating layer.

11. A method for preparing a coreless motor, for assembling a rotor assembly and a stator assembly to form a coreless motor, It is characterized in that The stator assembly includes a support layer, and the preparation method of the stator assembly includes: Providing a preformed flexible winding, wherein the flexible winding is a hollow tubular structure; Providing the support layer, wherein the support layer is a hollow tubular structure; Sleeve the flexible winding on the outer side wall of the support layer; The support layer has two working states: contracting radially inward and expanding radially outward. In the working state of contracting radially inward, the outer diameter of the support layer is smaller than the inner diameter of the flexible winding. When the support layer is in the radially outward expansion state, the outer diameter of the support layer is not less than the inner diameter of the flexible winding; The supporting layer is kept in a working state of contracting radially inward, the flexible winding is sleeved on the supporting layer, and then the supporting layer is controlled to switch to a working state of expanding radially outward.

12. The method for preparing the coreless motor according to claim 11, It is characterized in that When the flexible winding is in a tensioned state, the support layer stops expanding radially outward and is locked.

13. The method for preparing the coreless motor according to claim 12, It is characterized in that The support layer comprises: A body, wherein the body is disposed on the outer periphery of the rotor assembly, and a gap is left between the inner side wall of the body and the rotor assembly; A plurality of adjustment units, each of which comprises a first adjustment portion whose bottom is fixed to the outer side wall of the body and a second adjustment portion cooperating with the first adjustment portion, wherein the second adjustment portion has a degree of freedom to rotate clockwise and counterclockwise along the central axis of the body on the surface of the first adjustment portion, when the second adjustment portion rotates counterclockwise, the distance between the outer side wall of the second adjustment portion and the body gradually increases, and when the second adjustment portion rotates clockwise, the distance between the outer side wall of the second adjustment portion and the body gradually decreases, and the winding sleeve is arranged on the outer side wall of the second adjustment portion; The second adjusting part is controlled to rotate counterclockwise, and when the inner side wall of the winding is tensioned on the supporting layer, the second adjusting part stops rotating and is locked.

14. The method for preparing the coreless motor according to claim 11, It is characterized in that A protective layer is provided on the outside of the supporting layer, and the protective layer is connected to one side of the supporting layer to form a double-layer cup-shaped structure. A winding gap is provided between the protective layer and the supporting layer, and the size of the winding gap is not less than the thickness size of the flexible winding, and the flexible winding is embedded in the winding gap.

15. The method for preparing the coreless motor according to claim 11, It is characterized in that Also includes: The flexible winding sleeved on the supporting layer is shaped.

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