Assembling method, assembling tool and filling and sealing mold of motor stator structure

Abstract

The invention provides an assembling method, an assembling tool and a filling and sealing mold of a motor stator structure, and the assembling method comprises the following steps: providing the assembling tool which comprises an assembling core rod; a bearing assembly is provided, and the bearing assembly is arranged on the assembling core rod in a sleeving mode; providing a coil, and arranging the coil outside the assembly core rod; a front end connecting piece and an iron core which are coaxially connected at the end are provided, the front end connecting piece is arranged outside the assembling core rod in a sleeving mode, and the iron core is arranged outside the coil in a sleeving mode; providing a potting mold, placing the installed assembly core rod in a potting cavity of the potting mold, and injecting packaging glue into the potting cavity to form a packaging layer so as to integrally package the stator assembly, the front end connecting piece and the bearing assembly to form a motor stator structure; and withdrawing the assembly core rod out of the motor stator structure to finish assembly. According to the invention, the coaxiality, the stability, the surface flatness and other performances of the motor stator structure are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and more specifically, to an assembly method, an assembly tool and a potting mold for a motor stator structure. Background Art

[0002] Auxiliary treatment in the field of heart failure needs to provide a higher flow rate to meet the corresponding ventricular assist device, so the motor speed is relatively high, up to 50,000 rpm. At the same time, the device needs to enter the expected treatment position from the puncture point. The outer diameter of the device needs to be as small as possible to reduce damage to the puncture point, and the rigid length should be as short as possible. Clinically, it is recommended that the maximum outer diameter should not exceed 8mm and the rigid length should not exceed 40mm.

[0003] The existing motor has a coaxiality problem between the coil and the iron core of the stator assembly and between the stator assembly and the rotor assembly, which leads to an unbalanced magnetic circuit and large rotation eccentricity. Under high speed conditions, the motor is prone to excessive temperature rise and excessive motor vibration, which can damage blood vessels and blood tissue. When operating at high frequency, the lifespan is short, which makes it difficult to meet the clinical use requirements of more than 7 days or even up to 1 month.

[0004] Therefore, based on the problems existing in the prior art, it is necessary to provide an assembly method, assembly tooling and potting mold for a motor stator structure to improve the coaxiality, stability and surface flatness of the motor stator structure. Summary of the invention

[0005] In view of this, the present invention provides an assembly method of a motor stator structure, wherein the motor stator structure comprises a stator assembly, a front end connector and a bearing assembly, wherein the stator assembly at least comprises a coil and an iron core coaxially sleeved in sequence from the inside to the outside, wherein the stator assembly has a first end and a second end, wherein the front end connector is coaxially connected to the iron core at the first end, and the bearing assembly is coaxially arranged at the second end of the stator assembly, and the method comprises the following steps:

[0006] a. Providing an assembly tool, wherein the assembly tool comprises an assembly mandrel;

[0007] b. Provide a bearing assembly, the bearing assembly comprising a bearing, a first protective sleeve and a second protective sleeve, the first protective sleeve and the second protective sleeve are respectively sleeved at two ends of the bearing, and the bearing assembly is sleeved onto the assembly mandrel;

[0008] c. Providing a coil, and sleeve the coil outside the assembly mandrel;

[0009] d. Provide the front end connector and the iron core that are coaxially connected at the end, sleeve the coaxially connected iron core and the front end connector outside the assembly core rod, and sleeve the iron core outside the coil;

[0010] e. providing a potting mold, placing the assembled core rod with the bearing assembly, the coil, the front end connector and the iron core installed in the potting cavity of the potting mold, injecting potting glue into the potting cavity to form a potting layer, so as to pot the stator assembly, the front end connector and the bearing assembly into one body to form the motor stator structure;

[0011] f. Remove the assembly mandrel from the motor stator structure to complete the assembly.

[0012] Optionally, an inner sleeve is coaxially arranged on the inner wall of the coil, and in the step c, before providing the coil, the inner sleeve is also provided, and the inner sleeve is sleeved outside the assembly mandrel and is arranged to fit the outer wall of the assembly mandrel.

[0013] Optionally, the inner sleeve is a polymer heat shrink sleeve; in the step c, the inner sleeve is fitted to the outer wall of the assembly mandrel by heat shrinking.

[0014] Optionally, in step c, after coating the outer wall of the inner sleeve with packaging glue, the coil is sleeved outside the inner sleeve so that the packaging glue fills the gap between the inner sleeve and the coil; then a heat shrink sleeve is sleeved outside the coil, and the heat shrink sleeve makes the coil fit tightly with the inner sleeve by heat shrinkage.

[0015] Optionally, in step c, the heat shrinkable tube is removed after the heat shrinkable tube is cured by heat shrinkage.

[0016] Optionally, in step c, after coating the outer wall of the inner sleeve with packaging glue, the coil is sleeved outside the inner sleeve so that the packaging glue fills the gap between the inner sleeve and the coil; and a crimping tool is used outside the coil to crimp the coil so that the coil fits tightly with the inner sleeve.

[0017] Optionally, in step d, after the packaging glue is coated on the outer wall of the coil, the iron core is sleeved outside the coil so that the packaging glue fills the gap between the coil and the iron core.

[0018] Optionally, in step d, the front end connector and the iron core are coaxially welded and connected at the end, or the front end connector and the iron core are integrally formed.

[0019] Optionally, the end of the front end connector connected to the iron core is provided with a plurality of open grooves spaced apart along the circumferential direction; in the step e, when the encapsulation glue is injected into the injection cavity to form the encapsulation layer, the open grooves are used to discharge air.

[0020] Optionally, the assembled core rod includes a first mounting segment, a second mounting segment and a third mounting segment which are coaxially connected in sequence, and the outer diameters of the first mounting segment, the second mounting segment and the third mounting segment decrease in sequence; in the step c, the inner sleeve is sleeved outside the first mounting segment close to the second mounting segment, and the inner sleeve is fitted against the outer wall of the first mounting segment; the axial length of the inner sleeve matches the axial length of the coil.

[0021] Optionally, the assembly mandrel comprises a first mounting segment, a second mounting segment and a third mounting segment which are coaxially connected in sequence, and the outer diameters of the first mounting segment, the second mounting segment and the third mounting segment decrease in sequence; in the step b, the bearing assembly is sleeved on the second mounting segment and the third mounting segment of the assembly mandrel.

[0022] Optionally, the end of the first mounting section of the assembly mandrel connected to the second mounting section is provided with a first step groove matching the first protective sleeve, and when the bearing is sleeved on the second mounting section, the first protective sleeve is arranged in affixed with the first step groove; the end of the second protective sleeve away from the bearing is sleeved outside the third mounting section, and the step c also includes: providing a protective heat shrink sleeve, the protective heat shrink sleeve is sleeved on the outside of the first protective sleeve, and after heat shrinkage, one end of the protective heat shrink sleeve extends to cover the first step groove, and the other end covers the end of the second protective sleeve close to the first protective sleeve; providing a tail connecting tube, the inner diameter of the tail connecting tube matches the outer diameter of the third mounting section, the tail connecting tube is sleeved outside the third mounting section, and one end is inserted into the end of the second protective sleeve away from the bearing.

[0023] Based on the same inventive concept, the present application also provides an assembly tool for the assembly method of the above-mentioned motor stator structure, the assembly tool comprising an assembly mandrel, the assembly mandrel comprising a first mounting section, a second mounting section and a third mounting section which are coaxially connected in sequence, the outer diameters of the first mounting section, the second mounting section and the third mounting section being reduced in sequence; the bearing assembly is sleeved on the second mounting section and the third mounting section of the assembly mandrel; the inner sleeve is coaxially fitted outside the first mounting section near the second mounting section; the coil is coaxially fitted outside the inner sleeve; the coaxially connected iron core and the front end connecting piece are sleeved outside the first mounting section, and the iron core is sleeved outside the coil; the assembly mandrel with the bearing assembly, the inner sleeve, the coil, the front end connecting piece and the iron core installed is placed in the casting cavity of the casting mold, and the encapsulation glue is injected into the encapsulation cavity to form an encapsulation layer, so as to encapsulate the stator assembly, the front end connecting piece and the bearing assembly into one to form the motor stator structure.

[0024] Based on the same inventive concept, the present application also provides a potting mold for the assembly method of the above-mentioned motor stator structure, the potting mold comprising a lower mold base and an upper mold base, the top surface of the lower mold base is provided with a lower potting cavity, the bottom surface of the upper mold base is provided with an upper potting cavity, when the upper mold base is molded with the lower mold base, the lower potting cavity and the upper potting cavity are combined into a potting cavity for accommodating an assembly core rod with an installed bearing assembly, an inner sleeve, a coil, a front end connector and an iron core, a gap is formed between the inner wall of the potting cavity and the iron core and the bearing assembly, allowing potting glue to be injected and filled to form a potting layer to pot the stator assembly and the bearing assembly as one.

[0025] Optionally, the end of the iron core connected to the front end connecting piece is provided with a plurality of open grooves spaced apart along the circumferential direction, and when the front end connecting piece is placed in the perfusion cavity, a gap is formed between the end of the iron core connected to the front end connecting piece and the inner wall of the perfusion cavity; the encapsulation mold is provided with an injection cavity, and the injection cavity is provided with an injection port connected to the perfusion cavity, and the injection port is provided near the open groove; the injection cavity allows a syringe to be inserted to inject packaging glue into the perfusion cavity from the injection port, and the open groove discharges air when the packaging glue is injected.

[0026] Optionally, it also includes a lead protection piece, which is semi-cylindrical as a whole; the diameter of the cylinder where the inner wall of the lead protection piece is located matches the outer diameter of the third mounting section of the assembly core rod, and the outer wall of the lead protection piece is provided with at least three lead grooves at intervals along the circumferential direction, and the lead grooves are axially through-going; when the assembly core rod is placed in the lower perfusion cavity, the lower surface of the end of the third mounting section away from the second mounting section is arranged in contact with the lower perfusion cavity, and the inner wall of the lead protection piece is arranged in contact with the upper surface of the end of the third mounting section away from the second mounting section, and the lead wire of the coil passes through the lead groove.

[0027] Based on the same inventive concept, the present application also provides a motor stator structure manufactured by the assembly method of the above-mentioned motor stator structure, the motor stator structure includes a stator assembly, a front end connector and a bearing assembly, the stator assembly includes at least an inner sleeve, a coil and an iron core coaxially sleeved in sequence from the inside to the outside, the stator assembly has a first end and a second end, the front end connector is coaxially connected to the iron core at the first end, the bearing assembly is coaxially arranged at the second end of the stator assembly, and the front end connector, the stator assembly and the bearing assembly are encapsulated as a whole by an encapsulation layer.

[0028] Compared with the prior art, the technical solution of the embodiment of the present invention has beneficial effects.

[0029] For example, in the assembly method of the motor stator structure of the present invention, the stator component, the front end connector and the bearing component are all assembled based on the assembly core rod to ensure the coaxiality of the stator component, the front end connector and the bearing component, and the rotor component is matched and installed with the bearing component and the front end connector, thereby ensuring the coaxiality of the rotor component and the stator component; the coil and the iron core of the stator component are coaxially installed in sequence based on the assembly core rod, the iron core is rigidly connected to the front end connector, and the coaxiality of the front end connector, the iron core and the core rod is ensured by the assembly core rod, thereby ensuring the coaxiality of the coil and the iron core; the assembly core rod with the bearing component, the coil, the front end connector and the iron core installed is placed in the pouring cavity of the pouring mold, and the stator component, the front end connector and the bearing component are encapsulated as a whole by injecting encapsulation glue into the pouring cavity to form an encapsulation layer, thereby ensuring the integrity and stability of the motor stator structure.

[0030] For another example, an inner sleeve is provided on the inner wall of the coil, and the heat shrinkage property of the inner sleeve enables it to fit tightly with the assembly core rod to ensure coaxiality; the smooth property of the inner sleeve enables the assembly core rod to be easily separated from the assembled motor stator structure.

[0031] For another example, after coating the outer wall of the inner sleeve with packaging glue, the coil is sleeved outside the inner sleeve so that the packaging glue fills the gap between the inner sleeve and the coil; then a heat shrink sleeve is disposed outside the coil to make the coil and the inner sleeve fit tightly by heat shrinkage, or a crimping tool is used to crimp the coil outside the coil so that the coil and the inner sleeve fit tightly, further ensuring the coaxiality and stability of the coil, while reducing the outer diameter of the coil as much as possible, thereby reducing the outer diameter of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a cross-sectional view of a motor stator structure in an embodiment of the present invention;

[0033] Figure 2 is a cross-sectional view of an assembled mandrel in an embodiment of the present invention;

[0034] Figure 3 is a schematic diagram of the connection between the iron core and the front end connecting piece in an embodiment of the present invention;

[0035] Figure 4 is a cross-sectional view of the assembly of the bearing assembly to the assembly mandrel in an embodiment of the present invention;

[0036] Figure 5 is a cross-sectional view of the assembly of the bearing assembly, the stator assembly and the front end connector to the assembly mandrel in an embodiment of the present invention;

[0037] Figure 6 It is a cross-sectional view of an assembly mandrel with a bearing assembly, a stator assembly and a front end connector installed in an embodiment of the present invention and placed in a lower die seat;

[0038] Figure 7 is a cross-sectional view of a motor stator assembly in a sealing mold after sealing and potting in an embodiment of the present invention;

[0039] Figure 8 It is a cross-sectional view of the motor stator assembly in the lower die seat after potting is completed in the embodiment of the present invention;

[0040] Fig. 9 Schematic diagram of the lead protection structure in an embodiment of the present invention.

[0041] In the figure:

[0042] 100-motor stator structure; 110-stator assembly; 111-inner sleeve; 112-coil; 113-iron core; 120-front end connector; 121-open slot; 130-bearing assembly; 131-bearing; 132-first protective sleeve; 133-second protective sleeve; 134-protective heat shrink sleeve; 135-tail connecting tube; 140-encapsulation layer;

[0043] 200 - assembly mandrel; 210 - first installation section; 211 - first stepped groove; 220 - second installation section; 230 - third installation section;

[0044] 300 - potting mold; 310 - lower mold base; 320 - upper mold base; 330 - injection cavity; 331 - injection port; 340 - lead protection part; 341 - lead groove. DETAILED DESCRIPTION

[0045] In order to make the purpose, features and beneficial effects of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It is understood that the specific embodiments described below are only used to explain the present invention, rather than to limit the present invention. In addition, the same or similar reference numerals may be used in the figures to refer to the same or similar elements in different embodiments, and the description of the same or similar elements in different embodiments and the description of the prior art elements, features, effects, etc. may be omitted.

[0046] Reference Figure 1 As shown, the motor stator structure 100 includes a stator assembly 110, a front end connector 120 and a bearing assembly 130. The stator assembly 110 includes at least a coil 112 and an iron core 113 coaxially sleeved in sequence from the inside to the outside. The stator assembly 110 has a first end and a second end. The front end connector 120 is coaxially connected to the iron core 113 at the first end, and the bearing assembly 130 is coaxially arranged at the second end of the stator assembly 110.

[0047] In some embodiments, an inner sleeve 111 is coaxially disposed on the inner wall of the coil 112 .

[0048] Reference Figures 2 to 8As shown, an embodiment of the present invention provides an assembly method of a motor stator structure.

[0049] Specifically, the assembly method comprises the following steps:

[0050] a. Providing an assembly tool, the assembly tool comprising an assembly mandrel 200;

[0051] b. Provide a bearing assembly 130, the bearing assembly 130 includes a bearing 131, a first protective sleeve 132 and a second protective sleeve 133, the first protective sleeve 132 and the second protective sleeve 133 are respectively sleeved on both ends of the bearing 131, and the bearing assembly 130 is sleeved on the assembly mandrel 200;

[0052] c. Provide a coil 112, and sleeve the coil 112 outside the assembly mandrel 200;

[0053] d. Provide a front end connector 120 and an iron core 113 that are coaxially connected at the end, the inner diameter of the front end connector 120 matches the outer diameter of the first mounting section 210, and sleeve the coaxially connected iron core 113 and the front end connector 120 outside the assembly core rod 200, and sleeve the iron core 113 outside the coil 112;

[0054] e. providing a potting mold 300, placing the assembled core rod 200 with the bearing assembly 130, the coil 112, the front end connector 120 and the iron core 113 installed in the potting cavity of the potting mold 300, and injecting the packaging glue into the potting cavity to form a packaging layer 140, so as to package the stator assembly 110, the front end connector 120 and the bearing assembly 130 into one body to form the motor stator structure 100;

[0055] f. Remove the assembly mandrel 200 from the motor stator structure 100 to complete the assembly.

[0056] In some embodiments, an inner sleeve 111 is coaxially arranged on the inner wall of the coil 112. Before providing the coil 112 in step c, the inner sleeve 111 is provided and sleeved on the outside of the assembly mandrel 200 so that the inner sleeve 111 is fitted to the outer wall of the assembly mandrel 200.

[0057] In some embodiments, the inner sleeve 111 is a polymer heat shrink sleeve; in step c, the inner sleeve 111 is fitted to the outer wall of the assembly mandrel 200 by heat shrinking, thereby ensuring the coaxiality of the inner sleeve 111 and the assembly mandrel 200.

[0058] Specifically, the inner sleeve 111 needs to have good biocompatibility, so a polymer heat shrink sleeve with a thickness of 0.01mm-0.02mm can be selected; in some embodiments, the outer surface of the inner sleeve 111 can be roughened to increase the connection strength between the inner sleeve 111 and the coil 112; when a liquid channel needs to be reserved inside the motor, the inner sleeve 111 is used to isolate the direct contact between the solution and the coil 112; when there is no liquid channel inside the motor, the smooth surface of the inner sleeve 111 helps to detach the assembly core rod 200.

[0059] Specifically, the encapsulation glue usually adopts epoxy resin, and other medical glues can also be adopted.

[0060] In some embodiments, in step c, after the packaging glue is coated on the outer wall of the inner sleeve 111, the coil 112 is sleeved outside the inner sleeve 111, so that the packaging glue fills the gap between the inner sleeve 111 and the coil 112; then a heat shrink sleeve is arranged outside the coil 112, and the heat shrink sleeve makes the coil 112 fit tightly with the inner sleeve 111 by heat shrinkage.

[0061] In some embodiments, in step c, the heat shrink tube is removed after the heat shrink tube is cured to further reduce the outer diameter.

[0062] In some embodiments, in step c, after coating the outer wall of the inner sleeve 111 with packaging glue, the coil 112 is sleeved outside the inner sleeve 111 so that the packaging glue fills the gap between the inner sleeve 111 and the coil 112; a crimping tool is used outside the coil 112 to crimp the coil 112 so that the coil 112 fits tightly with the inner sleeve 111.

[0063] The tight fit between the coil 112 and the inner sleeve 111 can reduce the outer diameter of the coil 112 and thus reduce the outer diameter of the motor; the inner sleeve 111 and the coil 112 are filled with packaging glue to reduce the generation of internal cavities and improve structural stability.

[0064] In some embodiments, in step d, after the packaging glue is coated on the outer wall of the coil 112, the iron core 113 is sleeved outside the coil 112, so that the packaging glue fills the gap between the coil 112 and the iron core 113, reducing the generation of internal cavities and improving structural stability.

[0065] In some embodiments, in step d, the front end connector 120 and the core 113 are coaxially welded and connected at the end, or the front end connector 120 and the core 113 are integrally formed to achieve a coaxial rigid connection between the front end connector 120 and the core 113 at the end.

[0066] Specifically, the front end connector 120 is coaxially rigidly connected to the iron core 113 at the end. During the assembly process, the front end connector 120 cooperates with the first mounting section 210 of the assembly core rod 200 to ensure that the iron core 113 and the front end connector 120 are coaxially arranged with the assembly core rod 200, thereby ensuring the coaxiality of the iron core 113 and the coil 112.

[0067] In some embodiments, the end of the front connector 120 connected to the core 113 is provided with a plurality of open grooves 121 spaced apart along the circumferential direction; in step e, when the encapsulation glue is injected into the injection cavity to form the encapsulation layer 140, the open grooves 121 are used to discharge air.

[0068] In some embodiments, the assembled core rod 200 includes a first mounting segment 210, a second mounting segment 220 and a third mounting segment 230 coaxially connected in sequence, and the outer diameters of the first mounting segment 210, the second mounting segment 220 and the third mounting segment 230 decrease in sequence; in step c, the inner sleeve 111 is sleeved outside the first mounting segment 210 close to the second mounting segment 220, so that the inner sleeve 111 is fitted against the outer wall of the first mounting segment 210; the axial length of the inner sleeve 111 matches the axial length of the coil 112.

[0069] In some embodiments, the end of the first mounting section 210 of the assembled core rod 200 connected to the second mounting section 220 is provided with a first stepped groove 211 matching the first protective sleeve 132, and when the bearing 131 is sleeved on the second mounting section 220, the first protective sleeve 132 is arranged in contact with the first stepped groove 211; the end of the second protective sleeve 133 away from the bearing 131 is sleeved outside the third mounting section 230, and step c also includes: providing a protective heat shrink sleeve 134, the protective heat shrink sleeve 134 is sleeved on the outside of the first protective sleeve 132, and after heat shrinkage, one end of the protective heat shrink sleeve 134 extends to cover the first stepped groove 211, and the other end covers the end of the second protective sleeve 133 close to the first protective sleeve 132; providing a tail connecting tube 135, the inner diameter of the tail connecting tube 135 matches the outer diameter of the third mounting section 230, the tail connecting tube 135 is sleeved outside the third mounting section 230, and one end is inserted and set to the end of the second protective sleeve 133 away from the bearing 131.

[0070] Specifically, a circle of UV curing glue is applied on the outside of the protective heat shrink tube 134 covering the first step groove 211 and the end of the second protective cover 133 close to the first protective cover 132 for fixing and sealing; a circle of UV curing glue is applied on the outside of the end of the tail connecting tube 135 inserted into the second protective cover 133 for fixing and sealing; the sealing protection of the outside of the bearing 131 is realized to prevent the potting glue from entering the inside of the bearing 131 and affecting the performance of the bearing 131.

[0071] Specifically, the outer surface of the assembly mandrel 200 is surface treated to facilitate the subsequent withdrawal of the assembly mandrel 200 from the motor stator mechanism 100, and the surface treatment adds a PTFE coating to increase the lubrication performance, so that the assembly mandrel 200 and the motor stator mechanism 100 are smoothly separated without adhesion, and the inside of the motor stator mechanism 100 is flat and smooth. A diamond-like coating can also be added to improve the wear resistance of the assembly mandrel 200.

[0072] See also Figure 2 The embodiment of the present invention further provides an assembly tool for an assembly method of a motor stator structure, the assembly tool comprising an assembly mandrel 200, the assembly mandrel 200 comprising a first mounting section 210, a second mounting section 220 and a third mounting section 230 which are coaxially connected in sequence, the outer diameters of the first mounting section 210, the second mounting section 220 and the third mounting section 230 being reduced in sequence; the bearing assembly 130 is sleeved on the second mounting section 220 and the third mounting section 230 of the assembly mandrel 200; the inner sleeve 111 is coaxially fitted and sleeved outside the first mounting section 210 near the second mounting section 220; The coil 112 is coaxially fitted outside the inner sleeve 111; the coaxially connected iron core 113 and the front connecting piece 120 are sleeved outside the first installation section 210, and the iron core 113 is sleeved outside the coil 112; the assembled core rod 200 with the bearing assembly 130, the inner sleeve 111, the coil 112, the front connecting piece 120 and the iron core 113 installed is placed in the pouring cavity of the pouring mold 300, and the encapsulation glue is injected into the pouring cavity to form a packaging layer 140, so as to encapsulate the stator assembly 110, the front connecting piece 120 and the bearing assembly 130 as a whole to form the motor stator structure 100.

[0073] See also Figure 6-Figure 9 The embodiment of the present invention further provides a potting mold for an assembly method of a motor stator structure, wherein the potting mold 300 includes a lower mold base 310 and an upper mold base 320. The top surface of the lower mold base 310 is provided with a lower potting cavity, and the bottom surface of the upper mold base 320 is provided with an upper potting cavity. When the upper mold base 320 is molded with the lower mold base 310, the lower potting cavity and the upper potting cavity are combined into a potting cavity for accommodating an assembled core rod 200 with a bearing assembly 130, an inner sleeve 111, a coil 112, a front end connector 120 and an iron core 113 installed thereon. A gap is formed between the inner wall of the potting cavity and the iron core 113 and the bearing assembly 130, allowing potting glue to be injected and filled to form a potting layer 140, so as to pot the stator assembly 110 and the bearing assembly 130 as a whole.

[0074] In some embodiments, the end of the front end connector 120 connected to the iron core 113 is provided with a plurality of open grooves 121 at circumferential intervals. When the front end connector 120 is placed in the infusion cavity, a gap is formed between the end of the front end connector 120 connected to the iron core 113 and the inner wall of the infusion cavity. The encapsulation mold 300 is provided with an injection cavity 330. The injection cavity 330 is provided with an injection port 331 connected to the infusion cavity. The injection port 331 is provided near the open groove 121. The injection cavity 330 allows a syringe to be inserted to inject packaging glue into the infusion cavity from the injection port 331. The open groove 121 discharges air when the packaging glue is injected.

[0075] In some embodiments, a lead wire protection member 340 is also included, and the lead wire protection member 340 is semi-cylindrical as a whole; the diameter of the cylinder where the inner wall of the lead wire protection member 340 is located matches the outer diameter of the third mounting section 230 of the assembly core rod 200, and the outer wall of the lead wire protection member 340 is provided with at least three lead wire grooves 341 at intervals along the circumferential direction, and the lead wire grooves 341 are axially through-set; when the assembly core rod 200 is placed in the lower perfusion cavity, the lower surface of the end of the third mounting section 230 away from the second mounting section 220 is arranged in contact with the lower perfusion cavity, and the inner wall of the lead wire protection member 340 is arranged in contact with the upper surface of the end of the third mounting section 230 away from the second mounting section 220, and the lead wire of the coil 112 passes through the lead wire groove 341.

[0076] In a specific embodiment, the lead groove 341 can be determined according to the number and arrangement of the leads of the coil 112; the leads of the coil 112 pass through the lead groove 341 to prevent the leads from being encapsulated in the encapsulation layer 140 in step f.

[0077] An embodiment of the present invention also provides a motor stator structure manufactured by an assembly method of a motor stator structure. The motor stator structure 100 includes a stator assembly 110, a front end connector 120 and a bearing assembly 130. The stator assembly 110 includes at least an inner sleeve 111, a coil 112 and an iron core 113 coaxially sleeved in sequence from the inside to the outside. The stator assembly 110 has a first end and a second end. The front end connector 120 is coaxially connected to the iron core 113 at the first end. The bearing assembly 130 is coaxially arranged at the second end of the stator assembly 110. The front end connector 120, the stator assembly 110 and the bearing assembly 130 are encapsulated as a whole by an encapsulation layer 140.

[0078] Finally, it should be noted that the axial direction, radial direction and circumferential direction described in the embodiment of the present invention respectively represent the axial direction, radial direction and circumferential direction of the assembly mandrel 200 .

[0079] Although specific embodiments have been described above, these embodiments are not intended to limit the scope of the present disclosure, even when only a single embodiment is described with respect to specific features. The feature examples provided in the present disclosure are intended to be illustrative rather than limiting, unless otherwise stated. In specific implementations, the technical features of one or more dependent claims may be combined with the technical features of the independent claim, based on actual needs and where technically feasible, and may be derived from the technical features of the corresponding independent claim in any appropriate manner rather than simply through the specific combination listed in the claims.

[0080] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A method for assembling a motor stator structure, characterized in that: The motor stator structure comprises a stator assembly, a front end connector and a bearing assembly, wherein the stator assembly at least comprises a coil and an iron core coaxially sleeved in sequence from the inside to the outside, the stator assembly has a first end and a second end, the front end connector is coaxially connected to the iron core at the first end, and the bearing assembly is coaxially arranged at the second end of the stator assembly, comprising the following steps: a. Providing an assembly tool, wherein the assembly tool comprises an assembly mandrel; b. providing a bearing assembly, the bearing assembly comprising a bearing, a first protective sleeve and a second protective sleeve, The first protective sleeve and the second protective sleeve are respectively sleeved on both ends of the bearing, and the bearing assembly is sleeved on the assembly mandrel; c. Providing a coil, and sleeve the coil outside the assembly mandrel; d. Provide the front end connector and the iron core that are coaxially connected at the end, sleeve the coaxially connected iron core and the front end connector outside the assembly core rod, and sleeve the iron core outside the coil; e. providing a potting mold, placing the assembled core rod with the bearing assembly, the coil, the front end connector and the iron core installed in the potting cavity of the potting mold, injecting potting glue into the potting cavity to form a potting layer, so as to pot the stator assembly, the front end connector and the bearing assembly into one body to form the motor stator structure; f. Remove the assembly mandrel from the motor stator structure to complete the assembly.

2. The assembly method according to claim 1, characterized in that: The inner wall of the coil is coaxially provided with an inner sleeve. In the step c, before providing the coil, the inner sleeve is provided, and the inner sleeve is sleeved outside the assembly mandrel and is arranged to fit the outer wall of the assembly mandrel.

3. The assembly method according to claim 2, characterized in that: The inner sleeve is a polymer heat shrink sleeve; in the step c, the inner sleeve is fitted to the outer wall of the assembly core rod by heat shrinking.

4. The assembly method according to claim 2, characterized in that: In the step c, after coating the outer wall of the inner sleeve with encapsulation glue, the coil is sleeved outside the inner sleeve so that the encapsulation glue fills the gap between the inner sleeve and the coil; then a heat shrink sleeve is sleeved outside the coil, and the heat shrink sleeve makes the coil and the inner sleeve fit tightly by heat shrinkage.

5. The assembly method according to claim 4, characterized in that: In the step c, the heat shrinkable tube is removed after the heat shrinkable tube is cured.

6. The assembly method according to claim 2, characterized in that: In the step c, after coating the outer wall of the inner sleeve with packaging glue, the coil is sleeved outside the inner sleeve so that the packaging glue fills the gap between the inner sleeve and the coil; and a crimping tool is used outside the coil to crimp the coil so that the coil and the inner sleeve fit tightly.

7. The assembly method according to claim 1, characterized in that: In the step d, after the outer wall of the coil is coated with packaging glue, the iron core is sleeved outside the coil so that the packaging glue fills the gap between the coil and the iron core.

8. The assembly method according to claim 1, characterized in that: In the step d, the front end connector and the iron core are coaxially welded and connected at the end, or the front end connector and the iron core are integrally formed.

9. The assembly method according to claim 1, characterized in that: The end of the front end connector connected to the iron core is provided with a plurality of open grooves spaced apart along the circumferential direction; in the step e, when the encapsulation glue is injected into the injection cavity to form the encapsulation layer, the open grooves are used to discharge air.

10. The assembly method according to claim 2, characterized in that: The assembled core rod includes a first mounting section, a second mounting section and a third mounting section which are coaxially connected in sequence, and the outer diameters of the first mounting section, the second mounting section and the third mounting section decrease in sequence; in the step c, the inner sleeve is sleeved outside the first mounting section close to the second mounting section, and the inner sleeve is fitted against the outer wall of the first mounting section; the axial length of the inner sleeve matches the axial length of the coil.

11. The assembly method according to claim 1, characterized in that: The assembly mandrel comprises a first mounting section, a second mounting section and a third mounting section which are coaxially connected in sequence, and the outer diameters of the first mounting section, the second mounting section and the third mounting section decrease in sequence; in the step b, the bearing assembly is sleeved on the second mounting section and the third mounting section of the assembly mandrel.

12. The assembly method according to claim 11, characterized in that: The end of the first mounting section of the assembly mandrel connected to the second mounting section is provided with a first step groove matching the first protective sleeve, and when the bearing is sleeved on the second mounting section, the first protective sleeve is arranged in affixed with the first step groove; the end of the second protective sleeve away from the bearing is sleeved outside the third mounting section, and the step c also includes: providing a protective heat shrink sleeve, the protective heat shrink sleeve is sleeved on the outside of the first protective sleeve, and after heat shrinkage, one end of the protective heat shrink sleeve extends to cover the first step groove, and the other end covers the end of the second protective sleeve close to the first protective sleeve; providing a tail connecting tube, the inner diameter of the tail connecting tube matches the outer diameter of the third mounting section, the tail connecting tube is sleeved outside the third mounting section, and one end is inserted into the end of the second protective sleeve away from the bearing.

13. An assembly tool for the motor stator structure according to any one of claims 1 to 12, characterized in that: It includes an assembly core rod, which includes a first mounting section, a second mounting section and a third mounting section coaxially connected in sequence, and the outer diameters of the first mounting section, the second mounting section and the third mounting section are reduced in sequence; a bearing assembly is sleeved on the second mounting section and the third mounting section of the assembly core rod; an inner sleeve is coaxially fitted outside the first mounting section near the second mounting section; a coil is coaxially fitted outside the inner sleeve; a coaxially connected iron core and a front end connecting piece are sleeved outside the first mounting section, and the iron core is sleeved outside the coil; the assembly core rod with the bearing assembly, the inner sleeve, the coil, the front end connecting piece and the iron core installed is placed in a casting cavity of a casting mold, and encapsulation glue is injected into the encapsulation cavity to form an encapsulation layer, so as to encapsulate the stator assembly, the front end connecting piece and the bearing assembly into one body to form the stator structure of the motor.

14. A potting mold for assembling the motor stator structure according to any one of claims 1 to 12, characterized in that: It comprises a lower die base and an upper die base, the top surface of the lower die base is provided with a lower pouring cavity, the bottom surface of the upper die base is provided with an upper pouring cavity, when the upper die base is molded with the lower die base, the lower pouring cavity and the upper pouring cavity are combined into a pouring cavity for accommodating an assembled core rod on which a bearing assembly, an inner sleeve, a coil, a front end connector and an iron core are installed, a gap is formed between the inner wall of the pouring cavity and the iron core and the bearing assembly, allowing encapsulation glue to be injected and filled to form an encapsulation layer, so as to encapsulate the stator assembly and the bearing assembly as a whole.

15. The potting mold according to claim 14, characterized in that: The end of the front end connecting piece connected to the iron core is provided with a plurality of open grooves spaced apart along the circumferential direction. When the front end connecting piece is placed in the perfusion cavity, a gap is formed between the end of the front end connecting piece connected to the iron core and the inner wall of the perfusion cavity. The encapsulation mold is provided with an injection cavity, and the injection cavity is provided with an injection port connected to the perfusion cavity, and the injection port is arranged near the open groove. The injection cavity allows a syringe to be inserted to inject packaging glue into the perfusion cavity from the injection port, and the open groove discharges air when the packaging glue is injected.

16. The potting mold according to claim 14, characterized in that: It also includes a lead protection piece, which is semi-cylindrical as a whole; the diameter of the cylinder where the inner wall of the lead protection piece is located matches the outer diameter of the third mounting section of the assembly core rod, and the outer wall of the lead protection piece is provided with at least three lead grooves at intervals along the circumferential direction, and the lead grooves are axially through-going; when the assembly core rod is placed in the lower perfusion cavity, the lower surface of the end of the third mounting section away from the second mounting section is arranged in contact with the lower perfusion cavity, and the inner wall of the lead protection piece is arranged in contact with the upper surface of the end of the third mounting section away from the second mounting section, and the lead wire of the coil passes through the lead groove.

17. A motor stator structure manufactured by the motor stator structure assembly method according to any one of claims 1 to 12, characterized in that: It includes a stator assembly, a front end connector and a bearing assembly, wherein the stator assembly at least includes an inner sleeve, a coil and an iron core coaxially sleeved in sequence from the inside to the outside, the stator assembly has a first end and a second end, the front end connector is coaxially connected to the iron core at the first end, the bearing assembly is coaxially arranged at the second end of the stator assembly, and the front end connector, the stator assembly and the bearing assembly are encapsulated as a whole by an encapsulation layer.

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