Frameless motor stator filling and sealing device

Abstract

The utility model discloses a frameless motor stator filling and sealing device, comprising a lower support assembly which at least comprises a bottom plate used for supporting the shaft side end of a stator iron core provided with a leading-out wire and a sealing plug matched with the bottom plate and used for sealing the leading-out wire; the upper jacking assembly at least comprises a top plate used for jacking the shaft side end, back to the outgoing line, of the stator iron core; the internal sealing assembly is supported in the inner hole of the stator iron core and is in sealing fit with the inner hole wall of the stator iron core; and the fastening assembly is used for connecting the lower supporting assembly and the upper jacking assembly. According to the utility model, the potting effect of the stator of the frameless motor can be optimized.

Description

Technical Field

[0001] The utility model relates to the technical field of frameless motor processing, in particular to a frameless motor stator potting device. Background Art

[0002] A frameless motor is a specialized motor design that retains the torque- and speed-generating components of a traditional motor but eliminates the shaft, bearings, housing, and end caps. A frameless motor consists of two primary components: a rotor assembly and a stator assembly. The rotor assembly, typically the internal component, consists of a ring assembly with permanent magnets and is mounted directly on the machine shaft. This design allows the rotor to directly respond to electromagnetic forces, resulting in efficient energy conversion. The stator assembly, an external component, consists of silicon steel laminations encased in wire windings that generate electromagnetic force. Compactly mounted within the machine housing, the stator interacts with the rotor through electromagnetic induction to generate rotational torque.

[0003] The structure of frameless motors offers several unique advantages, including smaller size and higher efficiency. By eliminating unnecessary mechanical components, frameless motors offer greater design and application flexibility, making them particularly suitable for applications with space and weight constraints, such as humanoid robots and collaborative robots.

[0004] The production and processing of frameless motors typically utilizes potting processes. For example, publication number CN 113904514A discloses a frameless motor split-type stator potting tool and process. This method utilizes a laminated retaining ring, a press-forming component, and a potting assembly to achieve stator potting. However, actual research has revealed the following issues:

[0005] First, the potting tooling failed to account for the placement of the stator's lead wires, leading to contact between the potting compound and the lead wires during the potting process, resulting in glue accumulation. Second, the press component only affected one axial end of the stator, failing to ensure the smoothness of both ends after molding, and prone to glue overflow.

[0006] Therefore, in view of the many problems existing in the existing potting tooling, the potting tooling needs to be further optimized. Utility Model Content

[0007] The purpose of the utility model is to provide a frameless motor stator potting device to solve the technical problem of optimizing the potting effect of the stator.

[0008] The frameless motor stator potting device of the present invention is realized as follows:

[0009] A frameless motor stator potting device, comprising:

[0010] A lower support assembly comprising at least a bottom plate for supporting the axial end of the stator core provided with lead wires and a sealing plug cooperating with the bottom plate for sealing the lead wires;

[0011] An upper pressing assembly, which at least includes a top plate for pressing the axial end of the stator core facing away from the lead wire;

[0012] an internal sealing assembly supported in the inner bore of the stator core and sealingly engaged with the inner bore wall of the stator core;

[0013] The fastening assembly is used to connect the lower support assembly and the upper pressing assembly.

[0014] In an optional implementation of the present invention, the internal sealing assembly includes an elastic tube that fits the inner hole wall of the stator core and a supporting core rod inserted in the elastic tube.

[0015] In an optional implementation of the present invention, the upper pressing assembly further includes an upper plastic plate disposed between the top plate and the axial side end of the stator core.

[0016] In an optional embodiment of the present invention, the lower support assembly further comprises a lower plastic plate and a base provided between the bottom plate and the axial end of the rotor core; wherein

[0017] The lower plastic plate and the rotor core are in abutment with each other, and the base is arranged between the lower plastic plate and the bottom plate.

[0018] In an optional embodiment of the present invention, the base includes an annular base for abutting against the lower plastic plate and an annular extension body integrally formed on the inner ring wall of the annular base and extending radially; wherein

[0019] The side end surface of the annular extension body facing the stator core is concave relative to the side end surface of the annular base body facing the stator core, so that a space for accommodating the lead wire of the stator core is formed between the annular extension body and the axial side end of the stator core.

[0020] In an optional implementation of the present invention, the sealing plug adopts a T-shaped structure, which includes an integrally formed end cap and a rod body;

[0021] The annular extension body is provided with a through hole suitable for interference fit with the rod of the sealing plug; and

[0022] The end cap and the rod body are penetrated by through holes suitable for the lead wires of the stator core to pass through.

[0023] In an optional embodiment of the present invention, the axial end of the annular extension body facing the stator core is further adapted to support the elastic tube and one axial end of the support core rod; and

[0024] The axial length of the supporting core rod is not less than the axial length of the elastic tube.

[0025] In an optional embodiment of the present invention, the lower support assembly further includes a lower pressure plate provided on the side of the bottom plate facing away from the base;

[0026] The lower pressing plate is adapted to be fastened to the bottom plate.

[0027] In an optional embodiment of the present invention, the lower pressing plate includes an annular base plate for abutting and cooperating with the bottom plate and an annular extension plate integrally formed on the inner ring wall of the annular base plate and extending in the radial direction;

[0028] There is an axial distance between the annular extension plate and the annular extension body to accommodate the end cap of the sealing plug; and

[0029] The annular extension plate is also provided with an opening suitable for the lead wire to pass through.

[0030] In an optional implementation of the present invention, the fastening assembly includes at least two fastening screws spaced apart along the circumferential direction of the rotor core; and

[0031] Each of the fastening screws passes through the top plate, the upper plastic plate, the lower plastic plate, the annular base plate and the bottom plate in sequence.

[0032] By adopting the above technical solution, the present invention has the following beneficial effects: First, the frameless motor stator potting device of the present invention ensures the flatness of the potting surface on both axial ends of the stator core through the cooperation of the lower support assembly and the upper pressure assembly. Second, the internal sealing assembly achieves a sealed cooperation with the inner hole wall of the rotor core to prevent glue overflow in the inner hole of the rotor core. Furthermore, for the entire stator core, the lead wires are placed downward during potting, and the design of the sealing plug in the lower support assembly prevents the lead wires from breaking or glue accumulation in the lead wire area. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic structural diagram of the frameless motor stator potting device and the stator core according to the present invention from a first perspective;

[0034] Figure 2 This is a schematic structural diagram of the frameless motor stator potting device and the stator core from a second perspective of the present invention;

[0035] Figure 3 This is a schematic cross-sectional view of the stator potting device of the frameless motor in conjunction with the stator core of the present invention;

[0036] Figure 4 This is a schematic diagram of the exploded structure of the frameless motor stator potting device and the stator core of the present invention;

[0037] Figure 5 Schematic diagram of the cooperation between the internal sealing component and the stator core of the frameless motor stator potting device structure of the present invention;

[0038] Figure 6 Schematic diagram of the cooperation between the lower support assembly and the stator core of the frameless motor stator potting device structure in Example 1 of the present utility model;

[0039] Figure 7 Schematic diagram of the cooperation between the lower support assembly and the upper pressing assembly and the stator core of the frameless motor stator potting device structure of Example 1 of the present utility model;

[0040] Figure 8 This is a schematic diagram of the cooperation between the fastening assembly, the lower support assembly and the upper pressing assembly of the frameless motor stator potting device structure in Example 1 of the present utility model;

[0041] Figure 9 This is a schematic diagram of the cooperation between the lower pressure plate of the lower support assembly and the end cap of the sealing plug of the frameless motor stator potting device structure in Example 2 of the present utility model.

[0042] In the figure: stator core 1, lower plastic plate 21, bottom plate 22, base 23, annular base 231, annular extension body 232, through-hole 233, sealing plug 3, end cap 31, rod body 32, top plate 41, upper plastic 42, support core rod 51, elastic tube 52, fastening screw 6, lower pressure plate 7, annular extension plate 71, annular base plate 72, opening 73, screw 8, lead wire 9. DETAILED DESCRIPTION

[0043] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0044] Example 1:

[0045] See also Figures 1 to 9 As shown, this embodiment provides a frameless motor stator potting device, including: a lower support assembly, an upper pressing assembly, an internal sealing assembly and a fastening assembly used in conjunction with each other.

[0046] From the perspective of the potting process of the stator core 1, the lead wires 9 of the stator core 1 face downward, so the lower support assembly can support them from the bottom of the stator core 1. In this embodiment, the lead wires 9 of the stator core 1 are arranged downward, which can protect the lead wires 9 during the potting process. The upper pressing assembly is used to press the axial end of the stator core 1 away from the lead wires 9.

[0047] It should be noted that neither the lower support assembly nor the upper pressing assembly of this embodiment completely covers the axial side end of the stator core 1, but only a part of the structure on the axial side end close to the outer circular edge, so as to meet the requirements of potting and lead-out wire 9.

[0048] Specifically, an optional implementation is given in conjunction with the accompanying drawings. First, the lower support assembly:

[0049] The lower support assembly includes a lower plastic plate 21 abutting against the axial end of the stator core 1 , a base 23 abutting against the lower plastic plate 21 , and a bottom plate 22 abutting against the base 23 .

[0050] The lower plastic plate 21 can be made of stainless steel, meeting the required hardness and strength, and is coated with Teflon to prevent adhesive from sticking. The surface is smooth and flat, ensuring the outer diameter of the glue filling. The base 23 can be made of stainless steel, meeting the required hardness and strength, and is coated with Teflon to prevent adhesive from sticking. The bottom plate 22 can be made of stainless steel, meeting the required hardness and strength, and serves to connect the lower support assembly and the upper pressure assembly.

[0051] In more detail, the base 23 includes an annular base 231 for abutting against the lower plastic plate 21 and an annular extension body 232 integrally formed on the inner ring wall of the annular base 231 and extending radially; wherein the side end surface of the annular extension body 232 facing the stator core 1 is concave relative to the side end surface of the annular base 231 facing the stator core 1, so that a section for accommodating the lead wire 9 of the stator core 1 is formed between the annular extension body 232 and the axial side end of the stator core 1.

[0052] In addition to the above structure, it is also necessary to explain that the sealing plug 3 is a T-shaped structure comprising an integrally formed end cap 31 and rod 32; an annular extension 232 is provided with a through-hole 233 adapted for an interference fit with the rod 32 of the sealing plug 3; and through-holes are formed in the end cap 31 and rod 32 for passing the lead wires 9 of the stator core 1. The sealing plug 3 can optionally be made of rubber. In this structure, the guiding effect of the sealing plug 3 on the lead wire 9 prevents breakage, and the sealing engagement between the sealing plug 3 and the lead wire 9 prevents rubber accumulation on the lead wire 9.

[0053] Next, the upper pressing assembly will be described, which includes a top plate 41 for pressing the axial end of the stator core 1 facing away from the lead wire 9 and an upper plastic plate 42 provided between the top plate 41 and the axial end of the stator core 1 .

[0054] The top plate 41 can be made of stainless steel, which meets the required hardness and strength. It is also coated with Teflon, making it non-sticky and providing a smooth, even surface. This ensures the outer diameter of the glue injection molded into the stator core 1. The upper plastic plate 42 can be made of polypropylene, which meets the required hardness and strength while also being slightly elastic. This helps smooth the gaps in the core itself, ensuring that glue does not overflow from the outer diameter of the stator core 1.

[0055] Next, we will discuss the internal sealing assembly, which is supported within the inner bore of the stator core 1 and seals against the inner bore wall of the stator core 1. Specifically, the internal sealing assembly comprises an elastic tube 52 that conforms to the inner bore wall of the stator core 1 and a support core rod 51 inserted within the elastic tube 52. Based on this structure, the axial end of the annular extension 232 facing the stator core 1 is also adapted to support the elastic tube 52 and one axial end of the support core rod 51. Furthermore, the axial length of the support core rod 51 is not less than that of the elastic tube 52, thereby ensuring that the elastic tube 52, under the action of the support core rod 51, maintains close contact with the inner bore wall of the stator core 1.

[0056] The support core rod 51 can be made of polytetrafluoroethylene, which meets the required hardness and strength while also being able to expand at high temperatures. The elastic tube 52 can be made of silicone, which has good elasticity. Under the pressure of the support core rod 51, it seals the inner hole of the stator core 1, ensuring that no glue overflows from the inner hole of the stator core 1.

[0057] Finally, the fastening assembly, used to connect the lower support assembly and the upper pressing assembly, is discussed. Specifically, the fastening assembly includes at least two fastening screws 6 spaced apart along the circumference of the rotor core. Each fastening screw 6 sequentially passes through the top plate 41, the upper plastic plate 42, the lower plastic plate 21, the annular base plate 72, and the bottom plate 22.

[0058] In summary, the specific use process of the frameless motor stator potting device of this embodiment is as follows:

[0059] First, overlap the lower plastic plate 21 and the base 23 according to the matching position of the fastening screws 6, then place the stator core 1 on the lower plastic plate 21, pass the lead wire 9 through the through hole 233 on the annular extension body 232, and then place the lower plastic plate 21 and the base 23 on the bottom plate 22 according to the matching position of the fastening screws 6.

[0060] Next, the top plate 41 and the upper plastic plate 42 are overlapped according to the matching position of the fastening screws 6 and pressed together onto the stator core 1. The fastening screws 6 are sequentially passed through the top plate 41, the upper plastic plate 42, the lower plastic plate 21, the annular base plate 72 and the bottom plate 22 to slightly secure them. Next, the elastic tube 52 is placed into the inner hole of the stator core 1 with one axial end thereof abutting against the annular extension 232. The support core rod 51 is then inserted into the elastic tube 52 until at least part of the axial end of the support core rod 51 abuts against the annular extension 232. The fastening screws 6 are then tightened to secure the stator core 1.

[0061] Finally, multiple lead wires 9 are passed through the sealing plug 3 in sequence.

[0062] Based on the above situation, the flatness of the potting surface on both axial ends of the stator core 1 is ensured by the cooperation of the lower support assembly and the upper pressure assembly. Secondly, the internal sealing assembly achieves a sealed cooperation with the inner hole wall of the rotor core to prevent glue overflow in the inner hole of the rotor core. In addition, for the lower support assembly, the lower plastic plate 21 is in direct contact with the stator core 1. Similarly, for the upper pressure assembly, the upper plastic plate 42 is in direct contact with the stator core 1. Both the upper plastic plate 42 and the lower plastic plate 21 have a certain degree of elasticity. Through extrusion, the gaps in the stator core 1 itself can be filled, ensuring the effect of preventing glue overflow.

[0063] Example 2:

[0064] See also Figures 1 to 9 As shown, based on the frameless motor stator potting device of Example 1, the lower support assembly of the frameless motor stator potting device provided in this embodiment also includes a lower pressure plate 7 arranged on the side of the bottom plate 22 facing away from the base 23; wherein the lower pressure plate 7 is suitable for being fastened to the bottom plate 22 by, for example but not limited to, screws 8.

[0065] More specifically, the lower pressure plate 7 includes an annular base plate 72 for abutting against the bottom plate 22 and an annular extension plate 71 integrally formed on the inner ring wall of the annular base plate 72 and extending radially; there is an axial spacing between the annular extension plate 71 and the annular extension body 232 to accommodate the end cap 31 of the sealing plug 3; and the annular extension plate 71 is also provided with an opening 73 suitable for the lead wire 9 to pass through.

[0066] In summary, the design of the lower pressure plate 7 can protect the sealing plug 3, compress the sealing plug 3, and prevent the rubber plug from heating up and falling out due to high temperature, so that the sealing plug 3 is reliably located between the annular extension body 232 and the annular extension plate 71 and will not fall off.

[0067] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0068] In the description of the present invention, it should be understood that the terms indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0069] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0070] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0071] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0072] In the present invention, unless otherwise expressly specified or limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

Claims

1. A frameless motor stator potting device, characterized in that: include: A lower support assembly comprising at least a bottom plate for supporting the axial end of the stator core provided with lead wires and a sealing plug cooperating with the bottom plate for sealing the lead wires; An upper pressing assembly, which at least includes a top plate for pressing the axial end of the stator core facing away from the lead wire; an internal sealing assembly supported in the inner bore of the stator core and sealingly engaged with the inner bore wall of the stator core; The fastening assembly is used to connect the lower support assembly and the upper pressing assembly.

2. The frameless motor stator potting device according to claim 1, characterized in that: The internal sealing component comprises an elastic tube fitted with the inner hole wall of the stator core and a supporting core rod inserted in the elastic tube.

3. The frameless motor stator potting device according to claim 2, characterized in that: The upper pressing assembly further includes an upper plastic plate arranged between the top plate and the axial side end of the stator core.

4. The frameless motor stator potting device according to claim 3, characterized in that: The lower support assembly also includes a lower plastic plate and a base provided between the bottom plate and the axial end of the rotor core; The lower plastic plate and the rotor core are in abutment with each other, and the base is arranged between the lower plastic plate and the bottom plate.

5. The frameless motor stator potting device according to claim 4, characterized in that: The base comprises an annular base for abutting and cooperating with the lower plastic plate and an annular extension body integrally formed on the inner ring wall of the annular base and extending radially; The side end surface of the annular extension body facing the stator core is concave relative to the side end surface of the annular base body facing the stator core, so that a space for accommodating the lead wire of the stator core is formed between the annular extension body and the axial side end of the stator core.

6. The frameless motor stator potting device according to claim 5, characterized in that: The sealing plug adopts a T-shaped structure, which includes an integrally formed end cap and a rod body; The annular extension body is provided with a through hole suitable for interference fit with the rod of the sealing plug; and The end cap and the rod body are penetrated by through holes suitable for the lead wires of the stator core to pass through.

7. The frameless motor stator potting device according to claim 5 or 6, characterized in that: The axial end of the annular extension body facing the stator core is also suitable for supporting the elastic tube and one axial end of the supporting core rod; and The axial length of the supporting core rod is not less than the axial length of the elastic tube.

8. The frameless motor stator potting device according to claim 5 or 6, characterized in that: The lower support assembly further includes a lower pressing plate provided on the side of the bottom plate facing away from the base; in The lower pressing plate is adapted to be fastened to the bottom plate.

9. The frameless motor stator potting device according to claim 8, characterized in that: The lower pressing plate includes an annular base plate for abutting and cooperating with the bottom plate and an annular extension plate integrally formed on the inner ring wall of the annular base plate and extending in the radial direction; There is an axial distance between the annular extension plate and the annular extension body to accommodate the end cap of the sealing plug; and The annular extension plate is also provided with an opening suitable for the lead wire to pass through.

10. The frameless motor stator potting device according to claim 5 or 6, characterized in that: The fastening assembly includes at least two fastening screws spaced apart along the circumferential direction of the rotor core; and Each of the fastening screws passes through the top plate, the upper plastic plate, the lower plastic plate, the annular base plate and the bottom plate in sequence.

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