A pouring method and pouring tool suitable for motor winding core ventilation

Abstract

The application relates to the field of motor design and manufacturing processes, and discloses a pouring and sealing method and pouring and sealing tool suitable for motor winding core ventilation. The method sets a space-occupying block and a limiting block in a stator slot of a stator core with windings, so that a flow channel for epoxy resin glue flow is formed among the stator slot wedge, the limiting block and the space-occupying block; a core rod assembly provided with a glue conduit and a glue running gap is arranged in the stator core with windings, epoxy resin glue is injected into the core rod assembly through the glue conduit and the glue running gap, and the glue fills the internal gap along the flow channel; the space-occupying block is taken out after the glue solidifies, and an axial ventilation channel is formed in the stator core. The application can reserve a ventilation path while ensuring the pouring and sealing effect, is suitable for pouring and sealing of high-viscosity resin materials, and is beneficial to improving the ventilation and heat dissipation capacity of the motor.

Description

Technical Field

[0001] This invention belongs to the field of motor design and manufacturing technology, and particularly relates to a potting method and potting tooling suitable for ventilation of motor winding core. Background Technology

[0002] In the field of motor design and manufacturing, the potting process for wound stator cores is a key technology for improving the insulation performance, heat dissipation capacity, and structural strength of motors. Currently, the potting process for wound stator cores in domestic motors typically involves epoxy resin potting under normal or negative pressure conditions. The adhesive is liquid at room temperature or high temperature, filling the internal cavity of the winding from top to bottom under gravity, or the liquid adhesive fills the internal space of the winding from bottom to top under negative pressure. Both potting methods require the use of potting fixtures, and existing fixture designs often result in the adhesive filling the entire potting space.

[0003] However, existing technologies have the following problems and drawbacks: First, for high current density motors or motors that require extremely large overloads in a short period of time, good heat dissipation performance is required both externally and internally. According to the existing technical solutions, epoxy resin glue fills all the gaps in the motor winding core, and the only ventilation channel in the stator core and rotor core is the air gap space, which is far from meeting the stringent internal cooling requirements.

[0004] Secondly, with the continuous increase in power requirements, the volume of the wound stator core of potted motors is getting larger and larger, and the environmental conditions are becoming more and more severe. This places increasingly higher demands on the crack resistance of the potting materials, necessitating the use of high-viscosity resin materials for potting. However, in conventional processes, high-viscosity resin materials are difficult to completely fill the interior of the copper-wire-covered wound stator core from top to bottom using gravity, resulting in incomplete filling and consequently significantly reducing heat dissipation and insulation performance.

[0005] Third, existing potting fixtures cannot provide an effective ventilation path for the inside of the motor winding core after potting, which limits the motor's heat dissipation capacity under high power density conditions.

[0006] Therefore, there is an urgent need for a process that can reserve a ventilation path for the motor winding core after potting and is also suitable for potting high-viscosity resin materials. Summary of the Invention

[0007] This invention addresses the shortcomings of existing technologies by providing a potting method and potting fixture suitable for ventilation of motor winding cores.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a potting method suitable for ventilation of motor winding cores, comprising: A occupant block and a limiting block are provided in the slot of the stator core with winding stator core. The limiting block is located between the stator slot wedge and the occupant block, so that the stator slot wedge, the limiting block and the occupant block form an I-shaped cross-section structure, and flow channels for epoxy resin to flow are formed on both sides of the I-shaped cross-section structure. The mandrel assembly is inserted into the wound stator core, and the mandrel assembly is provided with an adhesive conduit and an adhesive flow gap communicating with the adhesive conduit. Epoxy resin is injected into the wound stator core through the glue conduit and the glue flow gap, so that the epoxy resin fills the internal voids of the wound stator core along the flow channel. The epoxy resin is cured, and the placeholder block is removed after curing, so that the space originally occupied by the placeholder block forms a ventilation channel that runs through the axial direction of the wound stator core.

[0009] Furthermore, the mandrel assembly includes an upper mandrel, a middle mandrel, and a lower mandrel, with the glue conduit sequentially passing through the upper and middle mandrels, and the glue flow gap being located on the upper end face of the lower mandrel and extending radially along the lower mandrel.

[0010] Furthermore, the glue flow gap is connected to the lower glue storage space formed by the wound stator core, the lower end cover and the mandrel assembly. The epoxy resin enters the lower glue storage space through the glue flow gap and flows upward along the flow channel after filling the lower glue storage space, so as to gradually fill the internal glue storage space of the wound stator core.

[0011] Furthermore, the slot of the stator core is a trapezoidal slot, and the limiting block and the occupant block are trapezoidal structures adapted to the trapezoidal slot. The limiting block, the occupant block, and the stator slot wedge form an interference fit in the radial direction to limit the position of the occupant block and the limiting block during the potting process.

[0012] Two to three limiting blocks are arranged axially at intervals in each slot of the stator core. The limiting blocks are respectively arranged in the upper, middle, and lower positions, or in the upper middle and lower middle positions.

[0013] The upper end cover is provided with an injection port. When the injection of epoxy resin on one side cannot meet the filling requirements of the internal gap of the wound stator core, epoxy resin is injected into the wound stator core through the injection port while epoxy resin is injected into the glue flow gap through the glue conduit, so as to achieve complete filling of the internal space of the wound stator core.

[0014] When assembling the mandrel assembly, the process round bar is inserted into the corresponding center holes of the lower end cover, lower mandrel, middle mandrel, and upper mandrel to keep the mandrel assembly coaxial. After the positioning of the mandrel assembly is completed, the process round bar is removed and the mandrel assembly is locked with the mandrel fastening kit.

[0015] A ventilation and potting fixture for an electric motor winding core includes an upper end cover, a lower end cover, a core rod assembly, a limiting block, and a occupant block. The upper end cover and the lower end cover are respectively disposed at both ends of the winding stator core and are connected by the core fastening kit; The mandrel assembly passes through the inner hole of the winding stator core and is locked by the mandrel fastening kit. The mandrel assembly is provided with an adhesive conduit for conveying epoxy resin and an adhesive flow gap communicating with the adhesive conduit. The limiting block and the occupant block are disposed in the slot of the stator core with winding stator core. The limiting block is located between the stator slot wedge and the occupant block, so that the stator slot wedge, the limiting block and the occupant block form an I-shaped cross-section structure, and flow channels communicating with the glue flow gap are formed on both sides of the I-shaped cross-section structure. The placeholder is designed to be removable from the slot of the stator core after the epoxy resin has cured, so that the location of the placeholder forms a ventilation channel that runs through the axial direction of the wound stator core.

[0016] In a preferred embodiment, the mandrel assembly passes through the inner hole of the wound stator core. The mandrel assembly has a central hole correspondingly arranged along the axial direction. The screw of the mandrel fastening kit passes through the central hole of the mandrel assembly along the axial direction and is locked by a nut to fasten the mandrel assembly into one piece.

[0017] In another preferred embodiment, the upper end cover and the lower end cover are respectively disposed at both ends of the winding stator core. The outer side of the lower end cover is fitted with the lower outer diameter of the winding stator core, and the side of the upper end cover is fitted with the upper outer diameter of the winding stator core. The upper end cover and the lower end cover are provided with corresponding screw holes. The core fastening kit passes through the screw holes and is locked, so that the upper end cover and the lower end cover are tightly fitted with the winding stator core.

[0018] Furthermore, the mandrel assembly includes an upper mandrel, a middle mandrel, and a lower mandrel. The upper mandrel and the middle mandrel are respectively provided with corresponding eccentric glue injection holes. The glue conduit is sequentially inserted into the eccentric glue injection holes of the upper mandrel and the middle mandrel. The glue flow gap is provided on the upper end face of the lower mandrel and extends radially.

[0019] Furthermore, the mandrel assembly is made of nylon or POM material and is configured to fit against the inner wall of the wound stator core and the inner wall of the lower end cap after thermal expansion during the potting heating process, so as to form a closed potting area.

[0020] Specifically, the lower end cover, lower core rod, middle core rod and upper core rod are respectively provided with central holes arranged along the central axis of the core rod assembly, and are provided with process round bars that can be detachably inserted into the central holes for coaxial positioning during the assembly of the core rod assembly.

[0021] In another preferred embodiment, the upper end cover is provided with an outlet hole for the lead wires of the wound stator core to pass through and an injection port for injecting epoxy resin.

[0022] In another preferred embodiment, the upper and lower end caps are made of aluminum or ferrous metal and have a POM material layer on their surface; the inner sidewalls of the upper and lower end caps for demolding are provided with a draft angle of 5° to 15°.

[0023] Compared with the prior art, the present invention has the following advantages.

[0024] This invention solves the problem of insufficient ventilation and heat dissipation inside the motor after potting by setting a placeholder block in the stator core slot, removing the placeholder block after potting and curing, and cleaning the residual glue. This creates a reserved ventilation channel inside the stator core with windings, thereby improving the heat dissipation performance of high current density motors and short-time overload motors.

[0025] Furthermore, the dual-path injection method, combining the glue inlet on the upper end cap with the glue conduit of the mandrel assembly, allows the epoxy resin to be filled from both bottom to top and top to bottom. This solves the problem that high-viscosity resin materials are difficult to completely fill the internal space of the wound stator core by gravity, ensuring the saturation and uniformity of the potting. Additionally, the mandrel assembly expands due to heat during potting, fitting snugly against the inner wall of the lower end cap and the inner wall of the wound stator core, forming a reliable sealed area within the tooling and effectively preventing glue leakage during potting.

[0026] This invention can be adapted to winding stator cores with different structures. By adjusting the dimensions and structure of the lower end cover, upper end cover, and core rod assembly, it can be adapted to winding stator cores of different specifications. At the same time, by adjusting the lead wire position of the upper end cover, it can accommodate winding stator cores with different lead wire exit methods, so that the lead wire position is fixed and uniform, which is convenient for production and quality management. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The scope of protection of the present invention is not limited to the following description.

[0028] Figure 1 This is a schematic diagram (longitudinal sectional view) of a potting process structure suitable for ventilation of motor winding core according to the present invention.

[0029] Figure 2 This is a schematic diagram (longitudinal sectional view) of the mandrel assembly structure of the present invention.

[0030] Figure 3 This is a schematic diagram (partial enlarged view) of the mandrel assembly structure of the present invention.

[0031] Figure 4 This is a schematic diagram (isometric view) of the mandrel structure of the present invention.

[0032] Figure 5 This is a schematic diagram (isometric view) of a potting process structure suitable for ventilation of motor winding core according to the present invention.

[0033] Figure 6 This is a schematic diagram of the flow channel for the potting process of the present invention (partial cross-sectional view).

[0034] Figure 7 This is a schematic diagram of the flow channel for the potting process of the present invention (partial longitudinal sectional view).

[0035] Figure 8 This is a schematic diagram of the upper end cap structure of the present invention.

[0036] Figure 9 This is a schematic diagram (top view) of the insertion tooling structure of the present invention.

[0037] Figure 10 This is a schematic diagram (isometric view) of the insertion tooling structure of the present invention.

[0038] In the diagram: 1. Upper end cover; 2. Stator core with windings; 201. Stator core; 202. Windings; 203. Stator slot wedge; 3. Limiting block; 4. Occupant block; 5. Lower end cover; 6. Core rod assembly; 601. Upper core rod; 602. Middle core rod; 603. Lower core rod; 604. Glue conduit; 7. Core fastening kit; 8. Eye nut; 9. Core rod fastening kit; 10. Epoxy resin glue; 11. Flow channel; 12. Process round bar; 13. Outlet hole; 14. Glue flow gap; 15. Lower glue storage space; 16. Upper glue storage space; 17. Internal glue storage space; 18. Glue injection port; 19. Insertion tooling. Detailed Implementation

[0039] The technical solution of the present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0040] like Figure 1-10This embodiment provides a potting method and potting fixture suitable for ventilation of motor winding core, including: upper end cover 1, winding stator core 2, limiting block 3, occupant block 4, lower end cover 5, core rod assembly 6, core fastening kit 7, eye nut 8, core rod fastening kit 9, and epoxy resin adhesive 10.

[0041] Specifically, the upper end cover 1 is a ring structure with holes for installing iron core fasteners axially around its circumference, and a wire outlet hole 13 is also provided on the ring along the axial direction. The lower end cover 5 is a circular end cover with a through hole in its center. The winding stator iron core 2 is a ring structure with trapezoidal slots evenly distributed around its inner sidewall. The winding 202 is disposed in the trapezoidal slots and is limited by stator slot wedges 203.

[0042] like Figure 2 and Figure 3 As shown, the mandrel assembly 6 includes: an upper mandrel 601, a middle mandrel 602, a lower mandrel 603, and an adhesive conduit 604. Through holes for installing the adhesive conduit 604 are axially formed on the upper mandrel 601 and the middle mandrel 602, and these through holes are eccentrically positioned; that is, eccentrically positioned glue injection holes. The adhesive conduit 604 is sequentially inserted into the eccentrically positioned glue injection holes. The upper mandrel 601 has a cylindrical structure with a cylindrical step on its outer circumference. The middle mandrel 602 also has a cylindrical structure with a cylindrical step on its outer circumference. The lower mandrel 603 has a disc-shaped structure with a through hole at its axial center, a radial glue-flowing gap on its upper end face, and the adhesive conduit 604.

[0043] like Figure 6 As shown, the winding stator core 2 consists of a stator core 201, a winding 202, and a stator slot wedge 203. A limiting block 3 is placed between the stator slot wedge 203 and the occupant block 4, and the three form an I-shaped cross-section structure. Flow spaces for storing epoxy resin adhesive 10 are reserved on both sides of the I-shape to facilitate the flow and storage of epoxy resin adhesive 10.

[0044] like Figure 1 and Figure 4 As shown, in one possible embodiment, the flow direction of the epoxy resin adhesive 10 is as follows: The epoxy resin adhesive 10 flows from top to bottom through the adhesive conduit 604 in the mandrel assembly 6 to the adhesive flow gap 14 of the lower mandrel 603. After the adhesive flow gap 14 is filled with epoxy resin adhesive 10, it flows through the adhesive flow gap 14 of the lower mandrel 603 into the lower adhesive storage space 15 formed by the non-leading end of the wound stator core 2, the lower end cover 5, and the mandrel assembly 6. After filling the space, the adhesive flows along... Figure 6 and Figure 7 The flow channel shown gradually fills the internal glue storage space 17 of the winding stator core 2 upwards, and the low-viscosity epoxy resin glue 10 can be injected from one side.

[0045] For high-viscosity epoxy resin adhesive 10, it is necessary to simultaneously... Figure 8 As shown, the adhesive is injected downwards from the top cap. The top cap 1 has an injection port 18. The epoxy resin adhesive 10 is injected directly through the injection port 18. Figure 6 and Figure 7 The flow channel shown fills the remaining internal glue storage space 17 of the wound stator core 2 from top to bottom, realizing the entire potting and glue injection.

[0046] Implementation steps of this embodiment: like Figure 6 As shown, the winding stator core 2 is an integral unit composed of stator core 201, winding 202, and stator slot wedge 203. A stator slot wedge 203 is axially arranged in each trapezoidal slot of the stator core 201. One side of the stator slot wedge 203 is the winding 202, and the other side of the stator slot wedge 203 has 2-3 limiting blocks 3 and 1 placeholder block 4 placed at the top, middle, and bottom or top-middle and bottom-middle, respectively, filling all the slots of the winding stator core 2.

[0047] The placement sequence of the limiting blocks 3 is as follows: first place the placeholder block 4 in each trapezoidal slot, and then place the limiting block 3. The limiting block 3 has a trapezoidal structure, and the height of the trapezoid is in an interference fit with the height between the placeholder block 4 and the stator slot wedge 203 to ensure that the limiting block 3 can be locked in place and cannot slide freely.

[0048] As a preferred embodiment, the potting method further includes: when installing the limiting block (3), using an insert tool (19) to install the limiting block (3) into the slot of the stator core (201), the insert tool (19) has two oppositely arranged outer positioning surfaces, the two outer positioning surfaces respectively fitting with the two opposite slot sides of the slot of the stator core (201); the insert tool (19) also has two oppositely arranged inner positioning surfaces, the two inner positioning surfaces respectively fitting with the two trapezoidal sides of the limiting block (3) to limit the installation posture of the limiting block (3) in the slot.

[0049] Select insert fixtures (19) of different lengths according to the predetermined axial installation depth of different limit blocks (3) to control the axial position of the limit blocks (3) and maintain the flow space of the flow channel (11).

[0050] Specifically, such as Figure 6 , Figure 9As shown, the slots of the stator core 201 have opposing surfaces A and B. The insertion fixture 19 has two outer positioning surfaces corresponding to the A and B surfaces respectively. During insertion, the two outer positioning surfaces of the insertion fixture 19 are respectively engaged with the A and B surfaces of the slots of the stator core 201, thereby positioning the insertion fixture 19. At the same time, the two trapezoidal sides of the limiting block 3 are respectively engaged with the two inner positioning surfaces of the insertion fixture 19, thereby restricting the posture of the limiting block 3 relative to the insertion fixture 19 and causing the limiting block 3 to be inserted into the slots of the stator core 201 according to a predetermined posture.

[0051] In other words, when placing the limiting block 3, the insert tool 19 is used, and this tool is designed to fit the dimensions of the stator core 201 and the limiting block 3. For example... Figure 9 As shown, the A / B surfaces of the insertion tool 19 are... Figure 6 The A / B surfaces are fitted together, and the limiting block 3 is higher than the insertion fixture 19, which facilitates the installation of the limiting block 3 and the removal of the insertion fixture 19 from the stator core 201 slot. For example... Figure 10 As shown, the two trapezoidal sides of the limiting block 3 fit against the two inner sides of the insertion tool 19, ensuring that the limiting block 3 is in a neat and displacement position within the stator core 201 slot.

[0052] When placing 2-3 limiting blocks 3 at different depths (upper, middle, lower or upper middle, lower middle), use insert fixtures 19 of different lengths to ensure depth accuracy, maximize the uniformity of the flow channel, and facilitate the flow and injection of epoxy resin 10.

[0053] The assembly process of the potting fixture in this embodiment: The lower mandrel 603 from the mandrel assembly 6 is inserted into the countersunk hole of the lower end cover 5. Then, the middle mandrel 602 is placed on the lower mandrel 603 with its larger end facing down and its smaller end facing up. The lower end cover 5 and the lower mandrel 603 both have through holes in their centers, ensuring that the through holes in the lower mandrel 603 and the center holes in the middle mandrel 602 are coaxial. At this point, a process round bar 12 is inserted into the coaxial hole formed by the above three components, serving as a coaxial limit. The process round bar 12 and the through hole are fitted with a clearance fit.

[0054] With the potting fixture facing upwards, the wound stator core 2 is then fitted onto the mandrel assembly 6. The outer side of the lower end face of the wound stator core 2 contacts and engages with the upper end face of the lower end cover 5, while the inner side of the lower end face contacts and engages with the middle step of the mandrel 602. Furthermore, the outer stop of the lower end cover 5 engages with the lower outer diameter of the wound stator core 2 to maintain concentricity.

[0055] like Figure 8As shown, the lead wires of the wound stator core 2 are passed through the lead wire holes of the upper cover 1, and the arrangement of the lead wires is adjusted. Then, the upper cover 1 and the wound stator core 2 are fitted together by the outer diameter of the core, and the baffle of the upper cover 1 is fitted with the upper outer diameter of the wound stator core 2 and is concentrically set.

[0056] The upper mandrel 601 is inserted into the inner hole of the winding stator core 2, and at the same time, the process round bar 12 is inserted into the central through hole of the upper mandrel 601, so that the mandrel assembly 6 is in a coaxial state under the action of the process round bar.

[0057] The upper cover 1 is fastened to the upper end of the wound stator core 2, and the coaxial positioning with the wound stator core 2 is achieved by the built-in step.

[0058] Adjust the upper end cover 1 so that the screw holes of the upper end cover 1 and the screw holes of the lower end cover 5 are aligned. Insert the iron core fastening kit 7 from bottom to top through the screw holes of the lower end cover 5 and tighten the nut so that the outer side of the lower end cover 5 matches the lower outer diameter of the wound stator iron core 2 and the side of the upper end cover 1 fits tightly with the upper outer diameter of the wound stator iron core 2, thereby sealing and forming the cavity filled with epoxy resin 10.

[0059] The upper mandrel 601 is axially provided with an injection hole for mounting the glue conduit 604. The injection hole is parallel to the center hole of the upper mandrel 601. The glue conduit 604 passes through the upper mandrel 601 and the middle mandrel 602 in sequence, and its lower end outlet is connected to the glue flow gap 14 on the upper end face of the lower mandrel 603, so that the glue can enter the glue flow gap 14 from the injection hole.

[0060] Insert the glue conduit 604 into the glue injection hole on the upper mandrel 601, and rotate the upper mandrel 601 (to achieve the through angle between the glue injection holes of the upper mandrel 601 and the middle mandrel 602), so that the glue conduit 604 can simultaneously pass through the corresponding glue injection hole of the middle mandrel 602, until the tail end of the glue conduit is flush with the upper end face of the upper mandrel 601. The assembly effect is as follows. Figure 2 and Figure 3 As shown. The length of the glue conduit 604 should be less than or equal to the total design height of the mandrel assembly 6. Setting it too long will cause blockage of the glue injection port and affect the glue injection efficiency.

[0061] Remove the aforementioned process round bar 12 from the bottom of the lower end cover 5, and then use the mandrel fastening kit 9. Insert the screw into the mandrel assembly 6 from below, and lock it in place with the flat washer, spring washer and nut.

[0062] Install lifting eye nuts 8 at the upper ends of the screws of the core fastening kit 7 at any two relative positions for overall product lifting. This completes the installation of the entire potting fixture. Figure 1 As shown.

[0063] The potting and demolding processes in this embodiment.

[0064] The above tooling is placed in an oven. During the potting process of epoxy resin 10, the material of the mandrel assembly 6 expands due to heat and fits (interference fit) with the inner wall of the lower end cover 5 and the inner wall of the winding stator core 2, forming a closed area inside the tooling.

[0065] The core assembly 6 is made of materials such as nylon or POM, which are easy to process, have good thermal expansion properties, and do not adhere to potting adhesives.

[0066] Then, epoxy resin adhesive 10 is evenly injected into the entire tooling according to the above flow channel description. The adhesive fills the entire gap space of the wound stator core 2 through the flow channel, achieving... Figure 1 The potting state is shown. Then, place it in an oven and cure it according to the curing process of epoxy resin adhesive 10 to complete the potting process.

[0067] After the epoxy resin adhesive 10 has cured, let it cool to room temperature first, and then remove the eye nut 8, mandrel fastening kit 9 ​​and iron core fastening kit 7 in sequence. First remove the upper end cover 1, then remove the upper mandrel 601, then the encapsulated winding stator iron core 2, middle mandrel 602 and glue conduit 604, and finally remove the lower mandrel 603 and lower end cover 5.

[0068] Finally, remove the placeholder block 4 from each trapezoidal slot and clean the remaining cured epoxy resin 10 from the slot opening. At this point, since the placeholder block 4 occupied the space inside the trapezoidal slot during the potting process, removing the placeholder block 4 forms a reserved ventilation channel (axially continuous), thus completing the potting process for ventilation of the motor winding core.

[0069] As a preferred embodiment of the present invention, both the lower end cover 5 and the upper end cover 1 are made of aluminum or iron metal with POM (polyoxymethylene) coating material on the surface, and can be adapted to different sizes and specifications of wound stator cores 2 by processing different sizes and structures.

[0070] As a preferred embodiment of the present invention, the inner walls of the lower end cover 5 and the upper end cover 1 are provided with a draft angle of 5°-15° so that the winding stator core 2 can be easily disassembled and demolded after potting and curing.

[0071] As a preferred embodiment of the present invention, the limiting block 3 and the occupant block 4 are trapezoidal structures, which are designed for the formation of trapezoidal shapes on the A / B surfaces of the groove. Different shapes of limiting blocks 3 and occupant blocks 4 can be designed for different groove types.

[0072] As a preferred embodiment of the present invention, the winding stator core 2 as a whole is in an interference fit relationship with the limiting block 3 and the occupant block 4 in the radial direction.

[0073] As a preferred embodiment of the present invention, the potting process of the present invention is also applicable to the process path of injecting epoxy resin adhesive 10 from bottom to top, that is, injecting adhesive from the bottom.

[0074] As a preferred embodiment of the present invention, the potting process of the present invention is also applicable to equipment pressure injection, and the injection is performed by directly connecting the glue conduit 604 to the injection port of the equipment.

[0075] It is understood that the above specific description of the present invention is only for illustrating the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those skilled in the art should understand that modifications or equivalent substitutions can still be made to the present invention to achieve the same technical effect; as long as the use needs are met, they are all within the protection scope of the present invention.

Claims

1. A potting method suitable for ventilation of motor winding core, characterized in that, include: A occupant block (4) and a limiting block (3) are provided in the slot of the stator core (201) with winding stator core (2). The limiting block (3) is located between the stator slot wedge (203) and the occupant block (4), so that the stator slot wedge (203), the limiting block (3) and the occupant block (4) form an I-shaped cross-section structure, and flow channels (11) for epoxy resin glue (10) to flow are formed on both sides of the I-shaped cross-section structure. The mandrel assembly (6) is inserted into the wound stator core (2). The mandrel assembly (6) is provided with an adhesive conduit (604) and an adhesive flow gap (14) communicating with the adhesive conduit (604). Epoxy resin adhesive (10) is injected into the wound stator core (2) through the adhesive conduit (604) and the adhesive flow gap (14), so that the epoxy resin adhesive (10) fills the internal voids of the wound stator core (2) along the flow channel (11). The epoxy resin adhesive (10) is cured, and the placeholder block (4) is removed after curing, so that the space originally occupied by the placeholder block (4) forms a ventilation channel that runs through the axial direction of the wound stator core (2).

2. The potting method for ventilation of motor winding cores according to claim 1, characterized in that: The mandrel assembly (6) includes an upper mandrel (601), a middle mandrel (602) and a lower mandrel (603). The glue conduit (604) passes through the upper mandrel (601) and the middle mandrel (602) in sequence. The glue flow gap (14) is provided on the upper end face of the lower mandrel (603) and extends radially along the lower mandrel (603).

3. The potting method for ventilation of motor winding cores according to claim 1, characterized in that: The glue flow gap (14) is connected to the lower glue storage space (15) formed by the wound stator core (2), the lower end cover (5) and the core rod assembly (6). The epoxy resin glue (10) enters the lower glue storage space (15) through the glue flow gap (14) and flows upward along the flow channel (11) after being filled in the lower glue storage space (15) to gradually fill the internal glue storage space (17) of the wound stator core (2).

4. The potting method for ventilation of motor winding cores according to any one of claims 1 to 3, characterized in that: The slot of the stator core (201) is a trapezoidal slot. The limiting block (3) and the occupant block (4) are trapezoidal structures adapted to the trapezoidal slot. The limiting block (3), the occupant block (4), and the stator slot wedge (203) form an interference fit in the radial direction to limit the position of the occupant block (4) and the limiting block (3) during the potting process.

5. The potting method for ventilation of motor winding cores according to claim 4, characterized in that: Two to three limiting blocks (3) are arranged axially in each slot of the stator core (201). The limiting blocks (3) are respectively arranged in the upper, middle and lower positions, or in the upper middle and lower middle positions.

6. The potting method for ventilation of motor winding cores according to any one of claims 4, characterized in that: The upper end cover (1) is provided with an injection port (18). When the injection of epoxy resin (10) on one side cannot meet the filling requirements of the internal gap of the wound stator core (2), while injecting epoxy resin (10) into the glue flow gap (14) through the glue conduit (604), epoxy resin (10) is injected into the wound stator core (2) through the injection port (18) to achieve complete filling of the internal space of the wound stator core (2).

7. The potting method for ventilation of motor winding cores according to claim 6, characterized in that: When assembling the mandrel assembly (6), the process round bar (12) is inserted into the corresponding center holes of the lower end cover (5), lower mandrel (603), middle mandrel (602) and upper mandrel (601) so that the mandrel assembly (6) remains coaxial; after the positioning of the mandrel assembly (6) is completed, the process round bar (12) is removed and the mandrel assembly (6) is locked by the mandrel fastening kit (9).

8. A ventilation and potting fixture for an electric motor winding core, characterized in that, It includes an upper end cover (1), a lower end cover (5), a core rod assembly (6), a limiting block (3), and a occupant block (4); The upper end cover (1) and the lower end cover (5) are respectively disposed at both ends of the winding stator core (2) and connected by the core fastening kit (7); The mandrel assembly (6) passes through the inner hole of the winding stator core (2) and is locked by the mandrel fastening kit (9). The mandrel assembly (6) is provided with an adhesive conduit (604) for conveying epoxy resin adhesive (10) and an adhesive flow gap (14) communicating with the adhesive conduit (604). The limiting block (3) and the occupant block (4) are disposed in the slot of the stator core (201) with the winding stator core (2). The limiting block (3) is located between the stator slot wedge (203) and the occupant block (4), so that the stator slot wedge (203), the limiting block (3) and the occupant block (4) form an I-shaped cross-section structure, and flow channels (11) communicating with the glue flow gap (14) are formed on both sides of the I-shaped cross-section structure. The occupant block (4) is configured to be removed from the slot of the stator core (201) after the epoxy resin adhesive (10) has cured, so that a ventilation channel is formed at the location of the occupant block (4) along the axial direction of the wound stator core (2).

9. The motor winding core ventilation and potting fixture according to claim 8, characterized in that: The mandrel assembly (6) includes an upper mandrel (601), a middle mandrel (602) and a lower mandrel (603). The upper mandrel (601) and the middle mandrel (602) are respectively provided with corresponding eccentric glue injection holes. The glue conduit (604) passes through the eccentric glue injection holes of the upper mandrel (601) and the middle mandrel (602) in sequence. The glue flow gap (14) is provided on the upper end face of the lower mandrel (603) and extends radially.

10. The motor winding core ventilation and potting fixture according to claim 8 or 9, characterized in that: The mandrel assembly (6) is made of nylon or POM material and is configured to fit against the inner wall of the wound stator core (2) and the inner wall of the lower end cap (5) after thermal expansion during the potting heating process, so as to form a closed potting area.

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