A kind of potting tool for joint module axial flux motor stator winding

Abstract

The application provides a potting tool for a stator winding of a joint module axial flux motor, which comprises a base, a core positioning disc, a coil pressing disc, locking bolts and nuts and an upper cover which are matched with each other; the base comprises a body and a thin-walled ring on the body, and a circular groove concentric with the thin-walled ring and a central shaft hole are arranged on the body; the lower surface of the core positioning disc is a plane, the upper surface is radiately and uniformly provided with a plurality of upper convex ribs and core tooth positioning grooves, the middle part of the upper surface is provided with a guide column, and the core positioning disc is provided with a central shaft hole penetrating through the upper and lower surfaces and the guide column; the lower surface of the coil pressing disc is radiately and uniformly provided with a plurality of lower convex ribs, the middle part of the lower surface is provided with a small cylinder, the middle part of the upper surface is provided with a large cylinder, and the coil pressing disc is provided with a stepped shaft hole penetrating through the upper and lower surfaces and the large and small cylinders; the top of the upper cover is provided with a groove matched with the large cylinder of the coil pressing disc and is provided with a wire outlet hole. The application has the advantages of reasonable structure, accurate positioning and reliable sealing.

Description

Technical Field

[0001] This invention relates to the field of axial motor potting tooling technology, specifically to a potting tooling for the stator winding of an axial flux motor with a joint module and its installation method. Background Technology

[0002] In precision drive applications such as robot joint modules, axial flux motors are widely used due to their advantages such as high torque density and compact structure. Their stator windings typically require potting during assembly to secure the coils, enhance insulation and heat dissipation, and protect the windings from external environmental influences.

[0003] The following problems often exist in existing stator winding potting processes:

[0004] 1. After the coil is formed on the stator core, it will rebound in the axial direction, causing the coil end face to extend beyond the stator core end face, reducing the axial air gap. During operation, it is easy to scrape against the rotor, affecting the normal operation of the motor.

[0005] 2. The coaxiality between the motor housing and the stator winding is difficult to guarantee, which leads to radial misalignment between the stator core and the rotor magnet, affecting the performance of the motor.

[0006] 3. Poor sealing between different parts of the potting mold can easily lead to glue leakage, contaminating the tooling or product.

[0007] 4. The lack of effective positioning of the radial position and axial height of the coil within the iron core affects the dimensional consistency of the winding after potting. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a potting fixture for the stator winding of the axial flux motor of the joint module that has a reasonable structure, accurate positioning and reliable sealing.

[0009] To solve the above-mentioned technical problems, the technical solution of the present invention is: a potting tool for the stator winding of an axial flux motor for a joint module, wherein the stator winding includes a stator core wound with an electromagnetic coil and a motor housing;

[0010] The potting fixture includes a base, a core positioning plate, a coil pressing plate, locking bolts and nuts, and a top cover. The base includes a body and a thin-walled ring on the body. The body has a circular groove concentric with the thin-walled ring and a central shaft hole. The lower surface of the core positioning plate is flat, and the upper surface has multiple upwardly protruding ribs and multiple core tooth positioning grooves arranged radially. A guide post is provided in the middle of the upper surface. The core positioning plate has a central shaft hole that penetrates the upper and lower surfaces and the guide post. The lower surface of the coil pressing plate has multiple downwardly protruding ribs arranged radially. A small cylinder is provided in the middle of the lower surface, and a large cylinder is provided in the middle of the upper surface. The coil pressing plate has a stepped shaft hole that penetrates the upper and lower surfaces and the large and small cylinders.

[0011] In operation, the core positioning plate is located in the circular groove of the base, the stator core is stacked on the core positioning plate, and the coil pressure plate is stacked on the stator core. The guide post of the core positioning plate is inserted into the shaft hole of the small cylinder of the coil pressure plate. The outer circumference of the small cylinder is in clearance fit with the shaft hole of the stator core. By passing the locking bolt and nut through the shaft holes of the base, the core positioning plate, and the coil pressure plate and tightening them, the stator core can be positioned and the electromagnetic coil can be pressed. The motor housing is fitted around the stator core and the thin-walled ring of the base, and the lower end face of the motor housing abuts against the base body. The upper cover is fitted around the outer circumference of the motor housing, and the lower end face of the upper cover abuts against the base body. The top of the upper cover has a groove that matches the large cylinder of the coil pressure plate and a wire outlet hole.

[0012] The above technical solution has the following characteristics:

[0013] 1) Because the upper surface of the iron core positioning plate is provided with multiple iron core tooth positioning grooves, the axial position of the iron core can be accurately positioned, thereby positioning the electromagnetic coil.

[0014] 2) The upper surface of the iron core positioning plate has multiple upward convex ribs that are evenly distributed radially, which can press the coil into the end face of the iron core and prevent the coil from protruding from the lower surface of the iron core; correspondingly, the lower surface of the coil pressing plate has multiple downward convex ribs that are evenly distributed radially, which can press the coil into the end face of the iron core and prevent the coil from protruding from the upper surface of the iron core.

[0015] 3) Since the core positioning plate is located in the circular groove of the base, the stator core is stacked on the core positioning plate, and the lower end face of the motor housing abuts against the base body, thus ensuring the axial position of the stator core within the motor housing.

[0016] 4) Since the position of the stator core is fixed by the core positioning plate and the coil plate, the concentricity of the motor housing and the stator core can be precisely guaranteed by the cooperation between the inner wall of the motor housing and the outer circumference of the thin-walled ring of the base.

[0017] 5) The inner wall of the top cover fits with the outer periphery of the motor housing, and the groove on the top of the top cover fits with the large cylinder of the pressure coil. This ensures the concentricity of the motor housing and the pressure coil. Finally, glue is injected from the outlet hole to complete the potting.

[0018] Furthermore, the core positioning plate has an axial positioning pin hole near the guide post, and the small cylinder of the coil pressing plate also has an axial positioning pin hole. By inserting a positioning pin into the positioning pin holes of both, the circumferential position of the core positioning plate and the coil pressing plate can be locked, ensuring that the convex ribs on the coil pressing plate and the core positioning plate can simultaneously press against the upper and lower coil end faces, thereby preventing the coil from rebounding and protruding from the core end face.

[0019] In one embodiment, in order to seal the gap between the iron core positioning plate and the base, a sealing groove and an O-ring are provided on the bottom wall of the circular groove of the base; in order to seal the gap between the iron motor housing and the base, a sealing groove and an O-ring are also provided on the outer circumferential surface of the thin-walled ring.

[0020] In one embodiment, in order to seal the gap between the iron core positioning disk and the pressure coil disk, a sealing groove and an O-ring are provided on the upper surface of the iron core positioning disk at the position corresponding to the small cylindrical end face of the pressure coil disk.

[0021] In one embodiment, the number of raised ribs on both the iron core positioning plate and the pressure coil plate is 24.

[0022] The beneficial effects of this invention are as follows: This invention adopts a two-way constraint method of "bottom positioning + top limiting". The iron core positioning plate and the coil pressing plate cooperate with each other to accurately position the circumferential position of the stator iron core. At the same time, the base body and the top cover are used to accurately position the position of the motor housing to ensure the axial position of the stator iron core in the motor housing, thereby achieving accurate radial and axial positioning of the motor winding assembly in the housing. The iron core positioning plate and the coil pressing plate press the coil into the iron core teeth to prevent the coil from rebounding out of the iron core teeth and scraping against the rotor, thus ensuring the flatness of the stator iron core end face. This ensures the uniformity of the air gap between the stator iron core end face and the rotor iron core, reducing the impact of uneven air gap on the normal operation of the motor. Attached Figure Description

[0023] Figure 1 This is an exploded view of the potting fixture for the stator winding of the axial flux motor of the joint module in an embodiment of the present invention.

[0024] Figure 2 This is a cross-sectional view of the potting fixture for the stator winding of the axial flux motor of the joint module in the working state according to an embodiment of the present invention.

[0025] Figure 3This is a schematic diagram of the base structure in an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the iron core positioning disk structure in an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the stator core structure in an embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the coil structure in an embodiment of the present invention;

[0029] Figure 7 This is a schematic diagram of the upper cover structure in an embodiment of the present invention;

[0030] The attached figures are labeled as follows:

[0031] 10. Base; 11. Body; 12. Thin-walled ring; 20. Iron core positioning plate; 21. Upper convex rib; 22. Iron core tooth positioning groove; 23. Guide column; 30. Stator iron core; 40. Motor housing; 50. Coil coil; 51. Lower convex rib; 52. Small cylinder; 53. Large cylinder; 60. Top cover; 61. Groove; 62. Cable outlet hole; 70. Locking bolt and nut. Detailed Implementation

[0032] To facilitate understanding by those skilled in the art, the invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the invention.

[0033] It should be noted in advance that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly in this invention. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0034] like Figures 1 to 7As shown, a potting fixture for the stator winding of an axial flux motor in a joint module is disclosed. The stator winding includes a stator core 30 with an electromagnetic coil wound around it and a motor housing 40. The potting fixture includes a base 10, a core positioning plate 20, a coil pressing plate 50, locking bolts and nuts 70, and a top cover 60. The base 10 includes a body 11 and a thin-walled ring 12 located on the body 11. The body 11 has a circular groove concentric with the thin-walled ring 12 and a central shaft hole. The core positioning plate 20... The lower surface of the coil is flat, and the upper surface has 24 radially distributed upward convex ribs 21 and 4 iron core tooth positioning grooves 22. A guide post 23 is provided in the middle of the upper surface. The iron core positioning plate 20 has a central shaft hole that penetrates the upper and lower surfaces and the guide post 23. The lower surface of the coil 50 has 24 radially distributed downward convex ribs 51. A small cylinder 52 is provided in the middle of the lower surface, and a large cylinder 53 is provided in the middle of the upper surface. The coil 50 has a stepped shaft hole that penetrates the upper and lower surfaces and the large and small cylinders.

[0035] like Figure 2 As shown, in the working state, the core positioning disk 20 is located in the circular groove of the base 10, the stator core 30 is stacked on the core positioning disk 20, and the coil pressing disk 50 is stacked on the stator core 30. The guide post 23 of the core positioning disk 20 is inserted into the shaft hole of the small cylinder 52 of the coil pressing disk 50. The outer circumferential surface of the small cylinder 52 is clearance-fitted with the shaft hole of the stator core 30. The locking bolt and nut 70 pass through the base 10, the core positioning disk 20, and the coil pressing disk 50. By tightening the shaft hole of 0, the stator core 30 can be positioned and the electromagnetic coil can be pressed. The motor housing 40 is fitted around the stator core 30 and the outer circumference of the thin-walled ring 12 of the base, and the lower end face of the motor housing 40 abuts against the base body 11. The upper cover 60 is fitted around the outer circumference of the motor housing 40, and the lower end face of the upper cover 60 abuts against the base body 11. The top of the upper cover 60 is provided with a groove 61 that matches the large cylinder 53 of the coil pressing disc, and is provided with a wire outlet hole 62.

[0036] like Figure 1 , 4 As shown in Figure 6, the core positioning disk 20 has an axial positioning pin hole near the guide post 23, and the small cylinder 52 of the coil pressing disk 50 also has an axial positioning pin hole. By inserting a positioning pin into the positioning pin holes of both, the circumferential position of the core positioning disk 20 and the coil pressing disk 50 can be locked, ensuring that the convex ribs on the coil pressing disk 50 and the core positioning disk 20 can simultaneously press against the upper and lower coil end faces, thereby preventing the coil from rebounding and protruding from the core end face.

[0037] like Figure 1 , 2As shown in Figures 3 and 4, in order to seal the gap between the iron core positioning plate 20 and the base 10, a sealing groove and an O-ring are provided on the bottom wall of the circular groove of the base 10; in order to seal the gap between the iron motor housing 40 and the base 10, a sealing groove and an O-ring are also provided on the outer circumferential surface of the thin-walled ring 12; in order to seal the gap between the iron core positioning plate 20 and the pressure coil plate 50, a sealing groove and an O-ring are provided on the upper surface of the iron core positioning plate 20 corresponding to the end face of the small cylinder 52 of the pressure coil plate 50.

[0038] The potting fixture provided in this embodiment has the following characteristics:

[0039] 1) Since the upper surface of the iron core positioning disk 20 is provided with 4 iron core tooth positioning grooves 22, the axial position of the iron core can be accurately positioned, thereby positioning the electromagnetic coil.

[0040] 2) The upper surface of the iron core positioning plate 20 has 24 radially distributed convex ribs 21, which can press the coil into the end face of the iron core and prevent the coil from protruding from the lower surface of the iron core; correspondingly, the lower surface of the coil pressing plate 50 has 24 radially distributed convex ribs, which can press the coil into the end face of the iron core and prevent the coil from protruding from the upper surface of the iron core.

[0041] 3) Since the core positioning plate 20 is located in the circular groove of the base 10, the stator core 30 is stacked on the core positioning plate 20, and the lower end face of the motor housing 40 abuts against the body 11 of the base 10, thus ensuring the axial position of the stator core 30 in the motor housing 40.

[0042] 4) Since the position of the stator core 30 is fixed by the core positioning plate 20 and the coil pressure plate 50, the concentricity of the motor housing 40 and the stator core 30 can be accurately guaranteed by the cooperation between the inner wall of the motor housing 40 and the outer circumference of the thin-walled ring 12 of the base 10.

[0043] 5) The inner wall of the upper cover 60 matches the outer periphery of the motor housing 40, and the groove 61 on the top of the upper cover 60 matches the large cylinder 53 of the pressure coil plate 50. This ensures the concentricity of the motor housing 40 and the pressure coil plate 50. Finally, glue is injected from the outlet hole 62 to complete the potting. After the glue has cured, the potting fixture is removed one by one to obtain the motor stator winding.

[0044] To facilitate understanding by those skilled in the art of the improvements made by the invention over the prior art, some of the accompanying drawings and descriptions have been simplified. The above embodiments are preferred implementations of the invention. In addition, the invention can be implemented in other ways. Any obvious substitutions without departing from the concept of the technical solution are within the scope of protection of the invention.

Claims

1. A potting tool for a stator winding of an axial flux motor for a joint module, the stator winding comprising a stator core (30) wound with an electromagnetic coil and a motor housing (40); Its features are: The potting fixture includes a base (10), a core positioning plate (20), a coiling coil (50), locking bolts and nuts (70), and a top cover (60); the base (10) includes a body (11) and a thin-walled ring (12) located on the body (11), the body (11) having a circular groove (61) concentric with the thin-walled ring (12) and a central shaft hole; the lower surface of the core positioning plate (20) is flat, and the upper surface has multiple upwardly protruding ribs evenly distributed radially. 21) and multiple iron core tooth positioning grooves (22), a guide post (23) is provided in the middle of the upper surface, the iron core positioning disk (20) is provided with a central shaft hole that penetrates the upper and lower surfaces and the guide post (23); the lower surface of the pressure coil disk (50) is radially distributed with multiple downward convex ribs (51), a small cylinder (52) is provided in the middle of the lower surface, a large cylinder (53) is provided in the middle of the upper surface, and the pressure coil disk (50) is provided with a stepped shaft hole that penetrates the upper and lower surfaces and the large and small cylinders; In the working state, the core positioning plate (20) is located in the circular groove (61) of the base (10), the stator core (30) is stacked on the core positioning plate (20), and the coil pressing plate (50) is stacked on the stator core (30). The guide post (23) of the core positioning plate (20) is inserted into the shaft hole of the small cylinder (52) of the coil pressing plate. The outer circumferential surface of the small cylinder (52) is clearance-fitted with the shaft hole of the stator core (30). The locking bolt nut (70) passes through the shaft holes of the base (10), the core positioning plate (20), and the coil pressing plate (50). Tightening the screws will position the stator core (30) and press the electromagnetic coil. The motor housing (40) is fitted around the stator core (30) and the thin-walled ring (12) of the base (10), and the lower end face of the motor housing (40) abuts against the base body (11). The upper cover (60) is fitted around the motor housing (40), and the lower end face of the upper cover (60) abuts against the base body (11). The top of the upper cover (60) is provided with a groove (61) that matches the large cylinder (53) of the coil pressure plate, and a wire outlet hole (62).

2. The potting fixture for the stator winding of an axial flux motor for a joint module according to claim 1, characterized in that: The iron core positioning plate (20) has an axial positioning pin hole near the guide post (23), and the small cylinder (52) of the pressure coil plate (50) also has an axial positioning pin hole.

3. The potting fixture for the stator winding of an axial flux motor for a joint module according to claim 1 or 2, characterized in that: The base (10) has a sealing groove and an O-ring on the bottom wall of the circular groove (61), and the outer circumferential surface of the thin-walled ring (12) also has a sealing groove and an O-ring.

4. The potting fixture for the stator winding of an axial flux motor for a joint module according to claim 1 or 2, characterized in that: The upper surface of the iron core positioning plate (20) is provided with a sealing groove and an O-ring at the position corresponding to the end face of the small cylinder (52) of the coil plate (50).

5. The potting fixture for the stator winding of an axial flux motor for a joint module according to claim 1 or 2, characterized in that: The number of raised ribs on the iron core positioning plate (20) and the pressure coil plate (50) is 24 each.

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