Filling and sealing tool for motor stator

Abstract

The utility model discloses a motor stator encapsulation tool, which comprises an upper core rod (1), a lower core rod (2) and a stator iron core (3), the peripheral wall of the lower core rod (2) is provided with a first step surface (2a) facing the upper end, the stator iron core (3) is sleeved on the periphery of the lower core rod (2), the lower end wall of the stator iron core (3) is abutted against the first step surface (2a), the upper core rod (1) is connected to the upper end of the lower core rod (2), and the upper core rod (1) is connected to the lower end of the lower core rod (2). The upper core rod (1) is provided with a second step surface (1a) facing the lower end, and the upper end wall of the stator core (3) abuts against the second step surface (1a). According to the utility model, the middle core rod is of a split structure, during installation, the stator core is firstly sleeved on the periphery of the lower core rod, then the upper core rod is connected to the upper end of the lower core rod, and the stator core is axially limited through the first step surface and the second step surface; the stator iron core is prevented from loosening along the axial direction due to the fact that the tooth position is affected by stress generated in the glue flushing and curing process, and the NVH performance of the motor is improved.

Description

Technical Field

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

[0002] In the motor stator assembly process, potting is usually used in the stator winding to increase its effective contact heat dissipation length. However, in order to take into account performance requirements, the stator punching sheets are thin and the stiffness of the teeth is poor. As a result, the teeth of the stator core become loose axially due to the stress generated during the potting process due to the glue punching and curing process, resulting in a decrease in the overall NVH performance of the motor.

[0003] In a patent for a motor stator non-turning epoxy potting tool and potting method in the prior art, the mandrel is made to fit tightly against the inner ring of the stator by calculating the interference fit of the mandrel to prevent the potting glue from seeping into the inner ring of the stator. However, this fails to solve the problem of the stator core becoming loose axially during the potting process because the tooth position is affected by the stress generated during the glue punching and curing process, resulting in a decrease in the overall NVH performance.

[0004] Therefore, how to provide a motor stator potting tool to solve the problem of the stator core becoming loose along the axial direction during the potting process due to the stress generated during the glue punching and curing process, so as to improve the overall NVH performance of the motor. Utility Model Content

[0005] The utility model aims to provide a motor stator potting tool to solve the problem that the stator core becomes loose along the axial direction during the potting process because the tooth position is affected by the stress generated during the glue punching and curing process, thereby improving the overall NVH performance of the motor.

[0006] In order to solve the above technical problems, the utility model provides a motor stator potting tool, including an upper core rod, a lower core rod and a stator core, the outer peripheral wall of the lower core rod has a first step surface facing the upper end, the stator core is sleeved on the outer periphery of the lower core rod, the lower end wall portion of the stator core abuts against the first step surface, the upper core rod is connected to the axial upper end of the lower core rod, the upper core rod has a second step surface facing the lower end, and the upper end wall portion of the stator core abuts against the second step surface.

[0007] The utility model arranges the middle core rod as a split structure. During installation, the stator core is firstly sleeved on the outer periphery of the lower core rod so that the lower end wall of the stator core abuts against the first step surface, and then the upper core rod is connected to the axial upper end of the lower core rod so that the upper end wall of the stator core abuts against the second step surface. In this way, the axial limitation of the stator core is achieved through the first step surface and the second step surface, so that the stator core is prevented from being loosened along the axial direction due to the influence of the stress generated during the punching and curing process on the tooth position of the stator core, thereby improving the overall NVH performance of the motor.

[0008] Optionally, a mounting groove is provided at the upper end of the lower core rod, and the upper core rod includes a thick section and a thin section axially connected, the second step surface is formed between the thick section and the thin section, the thin section is inserted into the mounting groove, and the second step surface abuts against the upper end wall of the lower core rod.

[0009] Optionally, the lower end wall of the mounting groove is provided with an axially extending threaded connection hole, the upper core rod is correspondingly provided with an axially connected through hole, the inner peripheral wall of the through hole has a first limiting wall facing the upper end, and also includes a threaded connection piece, the threaded connection piece passes through the through hole, the threaded connection piece and the threaded connection hole are threadedly connected, and the threaded connection piece and the first limiting wall are axially abutted.

[0010] Optionally, the through hole includes a large diameter section and a small diameter section which are axially connected, the small diameter section is located at one end close to the lower core rod, and the first limiting wall is formed between the large diameter section and the small diameter section.

[0011] Optionally, the lower core rod includes a first diameter segment and a second diameter segment axially connected, the second diameter segment is located at an end away from the upper core rod, the diameter of the second diameter segment is larger than the diameter of the first diameter segment, the first step surface is formed between the first diameter segment and the second diameter segment, and the stator core is sleeved on the outer periphery of the first diameter segment.

[0012] Optionally, it also includes a base, a stator shell and an upper pressure plate, the stator shell is a cylindrical structure, the stator shell is connected to the upper side wall of the base, the lower end of the lower core rod is connected to the upper side wall of the base, the upper core rod, the lower core rod and the stator core are all located inside the stator shell, and the upper pressure plate is connected to the upper end of the stator shell.

[0013] Optionally, the lower core rod includes a core rod body and a connecting portion connected to the axial lower end of the core rod body, the cross-sectional area of ​​the connecting portion is larger than the maximum cross-sectional area of ​​the core rod body, and the connecting portion fits the base.

[0014] Optionally, the lower core rod and the base are connected via a threaded connector; the stator housing and the base are connected via a threaded connector; and the upper pressure plate and the stator housing are connected via a threaded connector.

[0015] Optionally, it further includes a stator winding, the stator core has a stator core slot, and the stator winding is embedded in the stator core slot.

[0016] Optionally, the upper core rod and the lower core rod are made of polytetrafluoroethylene. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is an axial cross-sectional view of a specific embodiment of the motor stator potting tooling provided by the utility model;

[0018] Figure 2 for Figure 1 Schematic diagram of the structure of the lower core rod in the motor stator potting tooling;

[0019] Figure 3 for Figure 1 Schematic diagram of the structure of the upper core rod in the motor stator potting tooling;

[0020] Figure 4 for Figure 1 An enlarged view of point I in the motor stator potting tooling;

[0021] Figure 5 for Figure 1 Enlarged view of location II in the motor stator potting tooling;

[0022] in, Figure 1-Figure 5 The reference numerals in the figures are described as follows:

[0023] 1-upper core rod; 11-thick section; 12-thin section; 1a-second step surface; 1b-through hole; 1b1-large diameter section; 1b2-small diameter section;

[0024] 2-lower core rod; 21-first diameter section; 22-second diameter section; 23-connecting portion; 2a-first step surface; o-installation groove; 2b-threaded connection hole;

[0025] 3- stator core;

[0026] 4- Base;

[0027] 5- stator housing;

[0028] 6-upper pressing plate;

[0029] 7- stator winding;

[0030] A-Threaded connector. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] The “plurality” mentioned herein generally means more than two; and when “plurality” is used to indicate the number of certain components, it does not indicate the relationship between the quantities of these components.

[0033] Please refer to Figure 1-Figure 5 , Figure 1 This is an axial cross-sectional view of a specific embodiment of the motor stator potting tooling provided by the utility model; Figure 2 for Figure 1 Schematic diagram of the structure of the lower core rod in the motor stator potting tooling; Figure 3 for Figure 1 Schematic diagram of the structure of the upper core rod in the motor stator potting tooling; Figure 4 for Figure 1 An enlarged view of point I in the motor stator potting tooling; Figure 5 for Figure 1 Enlarged view of point II in the motor stator potting tooling.

[0034] The utility model provides a motor stator potting tool, comprising an upper core rod 1, a lower core rod 2 and a stator core 3, the outer peripheral wall of the lower core rod 2 has a first step surface 2a facing the upper end, the stator core 3 is sleeved on the outer periphery of the lower core rod 2, the lower end wall portion of the stator core 3 abuts against the first step surface 2a, the upper core rod 1 is connected to the axial upper end of the lower core rod 2, the upper core rod 1 has a second step surface 1a facing the lower end, and the upper end wall portion of the stator core 3 abuts against the second step surface 1a.

[0035] The utility model arranges the middle core rod as a split structure. During installation, the stator core 3 is firstly sleeved on the outer periphery of the lower core rod 2 so that the lower end wall of the stator core 3 abuts against the first step surface 2a, and then the upper core rod 1 is connected to the axial upper end of the lower core rod 2 so that the upper end wall of the stator core 3 abuts against the second step surface 1a. In this way, the axial limitation of the stator core 3 is achieved by the first step surface 2a and the second step surface 1a, so that the stator core 3 is prevented from loosening along the axial direction due to the influence of the stress generated during the punching and curing process on the tooth position of the stator core 3, thereby improving the NVH performance of the whole motor.

[0036] Among them, Figure 1-Figure 3As shown, in this embodiment, the upper end of the lower core rod 2 is provided with a mounting groove o, and the upper core rod 1 includes a thick section 11 and a thin section 12 connected axially, the thick section 11 is located at the upper end of the thin section 12, and the aforementioned second step surface 1a is formed between the thick section 11 and the thin section 12, and the thin section 12 is inserted into the mounting groove o, and the second step surface 1a abuts against the upper end wall of the lower core rod 2. Obviously, the diameter of the thick section 11 is larger than the inner diameter of the stator core 3, so that the part of the second step surface 1a protruding from the lower core rod 2 will also abut against the upper end wall of the stator core 3, which plays a role in limiting the axial upper end of the stator core 3.

[0037] Furthermore, the lower end wall of the mounting groove o is provided with an axially extending threaded connection hole 2b, and the upper core rod 1 is correspondingly provided with an axially connected through hole 1b, the inner peripheral wall of the through hole 1b has a first limiting wall 1c facing the upper end, and also includes a threaded connection member A, the threaded connection member A passes through the inside of the through hole 1b, the threaded connection member A and the threaded connection hole 2b are threadedly connected, and the threaded connection member A and the first limiting wall 1c are axially abutted.

[0038] The threaded connector A can be a connecting bolt. Thus, the upper core rod 1 and the lower core rod 2 are connected together by the threaded connector A, and the connection is reliable. At the same time, the axial limit of the stator core 3 by the first step surface 2a and the second step surface 1a can be ensured to be reliable.

[0039] In practice, the upper core rod 1 and the lower core rod 2 are not limited to the above-mentioned connection method. It is also feasible that the lower core rod 2 is not provided with the installation groove o. At this time, the diameter of the upper core rod 1 remains unchanged, the lower end wall of the upper core rod 1 and the upper end wall of the lower core rod 2 are abutted, and the lower end wall of the upper core rod 1 forms the aforementioned second step surface 1a.

[0040] Of course, in the arrangement of this embodiment, when installing the upper core rod 1, the thin segment 12 can be first inserted into the installation groove o, and the threaded connection hole 2b and the through hole 1b are connected one by one, and the design is such that there is a certain extrusion pressure between the thin segment 12 and the installation groove o to ensure that the upper core rod 1 does not rotate, and then the threaded connection A is installed to connect the upper core rod 1 and the lower core rod 2 together. It can be seen that in this embodiment, the upper core rod 1 can be pre-positioned before the threaded connection A is installed, which is convenient for the insertion of the threaded connection A and improves the assembly efficiency.

[0041] In addition, in practice, it is also feasible to fix the upper core rod 1 and the lower core rod 2 by the interference fit between the thin segment 12 and the mounting groove o. In this case, the interference between the thin segment 12 and the mounting groove o needs to be designed to ensure that the upper core rod 1 and the lower core rod 2 will not be disengaged and the axial limit of the stator core 3 is reliable.

[0042] Depend on Figure 1 It can be seen that in this embodiment, the lower end of the thin segment 12 is rounded to facilitate the thin segment 12 to be inserted into the installation groove o.

[0043] Please continue to refer to Figure 1 and Figure 3 In this embodiment, the through hole 1b includes an axially connected large diameter section 1b1 and a small diameter section 1b2, the small diameter section 1b2 is located at one end close to the lower core rod 2, and a first limiting wall 1c is formed between the large diameter section 1b1 and the small diameter section 1b2.

[0044] In this way, the head of the threaded connector A is located inside the large-diameter section 1 b 1 and abuts against the first connecting wall 1 c , thereby achieving axial fixation of the threaded connector A and the upper core rod 1 .

[0045] Please continue to refer to Figure 2 The lower core rod 2 includes an axially connected first diameter section 21 and a second diameter section 22. The second diameter section 22 is located at an end away from the upper core rod 1. The diameter of the second diameter section 22 is greater than the diameter of the first diameter section 21. The aforementioned first step surface 2a is formed between the first diameter section 21 and the second diameter section 22. The stator core 3 is mounted on the outer periphery of the first diameter section 21.

[0046] Obviously, the outer diameter of the second diameter section 22 is larger than the inner diameter of the stator core 3 , and the lower end wall of the stator core 3 will partially abut against the first step surface 2 a , thereby limiting the axial lower end of the stator core 3 .

[0047] In practice, the structure of the lower core rod 2 is not limited to the above embodiment. For example, the lower core rod 2 includes a lower core rod body of equal diameter sections, the peripheral wall of the lower core rod body is provided with an annular protrusion, and the upper side wall of the annular protrusion forms the aforementioned first step surface 2a.

[0048] Please continue to refer to Figure 1 In this embodiment, the motor stator potting tool also includes a base 4, a stator shell 5 and an upper pressure plate 6. The stator shell 5 is a cylindrical structure. The stator shell 5 is connected to the upper side wall of the base 4. The lower end of the lower core rod 2 is connected to the upper side wall of the base 4. The upper core rod 1, the lower core rod 2 and the stator core 3 are all located inside the stator shell 5, and the upper pressure plate 6 is connected to the upper end of the stator shell 5.

[0049] At the same time, it also includes a stator winding 7. The stator core 3 has stator core slots, and the stator winding 7 is embedded in the stator core slots.

[0050] The general installation sequence of the motor stator potting tooling of the utility model is:

[0051] First, the stator winding 7 is embedded in the stator core slot of the stator core 3, and the two are placed in the stator housing 5 to form a stator assembly;

[0052] The lower core rod 2 is installed on the base 4, and then the installed stator assembly is installed on the base 4 with the lower core rod 2. Finally, the upper core rod 1 is connected to the lower core rod 2, and the upper pressure plate 6 is connected to the positioning shell 5 to complete the assembly.

[0053] Among them, the lower end of the lower core rod 2 is connected to the upper side wall of the base 4. Specifically in this embodiment, the first diameter segment 21 and the second diameter segment 22 in the lower core rod 2 form a core rod body, and the lower core rod 2 also includes a connecting portion 23 connected to the axial lower end of the core rod body. The cross-sectional area of ​​the connecting portion 23 is larger than the maximum cross-sectional area of ​​the core rod body, that is, the cross-sectional area of ​​the connecting portion 23 is larger than the cross-sectional area of ​​the second diameter segment 22, and the connecting portion 23 is in contact with the base 4.

[0054] In this way, by providing the above-mentioned connecting portion 23, the supporting area of ​​the lower core rod 2 on the base 4 can be increased, and the connection stability of the lower core rod 2 can be improved.

[0055] Furthermore, in this embodiment, the lower core rod 2 and the base 4 are fixed by a threaded connector A. Specifically, the lower end of the lower core rod 2 has a threaded connection hole 2b, the lower end of the threaded connection hole 2b is open and extends upward, a through hole is provided at a corresponding position of the base 4, the inner peripheral wall of the through hole has a second limiting wall facing the lower end, the threaded connector A passes through the through hole, the threaded connector A and the threaded connection hole 2b are threadedly connected, and the threaded connector A and the second limiting wall are axially abutted. In this way, the lower core rod 2 and the base 4 are connected as a whole by the threaded connector A, and the connection is reliable.

[0056] Depend on Figure 1 It can be seen that the connection between the stator housing 5 and the base 4, and between the upper pressure plate 6 and the stator housing 5 are the same as described above, and are all connected through threaded connectors A, which will not be repeated here.

[0057] In addition, in this embodiment, the upper core rod 1 and the lower core rod 2 are both made of polytetrafluoroethylene.

[0058] In this way, after heating, the upper core rod 1 and the lower core rod 2 will expand and adhere to the stator core 3, so that the stator core 3 is subjected to a certain circumferential extrusion force, thereby preventing the stator core 3 from axially spreading due to the epoxy adhesive curing stress.

[0059] The above is a detailed introduction to a motor stator potting tool provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiment is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A motor stator potting tool, characterized in that: The invention comprises an upper core rod (1), a lower core rod (2) and a stator core (3), wherein the outer peripheral wall of the lower core rod (2) has a first step surface (2a) facing the upper end, the stator core (3) is sleeved on the outer periphery of the lower core rod (2), the lower end wall portion of the stator core (3) abuts against the first step surface (2a), the upper core rod (1) is connected to the axial upper end of the lower core rod (2), the upper core rod (1) has a second step surface (1a) facing the lower end, and the upper end wall portion of the stator core (3) abuts against the second step surface (1a).

2. The motor stator potting tool according to claim 1, characterized in that: The upper end of the lower core rod (2) is provided with a mounting groove (o), and the upper core rod (1) comprises a thick section (11) and a thin section (12) which are axially connected, and a second step surface (1a) is formed between the thick section (11) and the thin section (12), and the thin section (12) is inserted into the mounting groove (o), and the second step surface (1a) abuts against the upper end wall of the lower core rod (2).

3. The motor stator potting tool according to claim 2, characterized in that: The lower end wall of the mounting groove (o) is provided with an axially extending threaded connection hole (2b), and the upper core rod (1) is correspondingly provided with an axially connected through hole (1b), the inner peripheral wall of the through hole (1b) has a first limiting wall (1c) facing the upper end, and also includes a threaded connection member (A), the threaded connection member (A) passes through the inside of the through hole (1b), the threaded connection member (A) and the threaded connection hole (2b) are threadedly connected, and the threaded connection member (A) and the first limiting wall (1c) are axially abutted.

4. The motor stator potting tool according to claim 3, characterized in that: The through hole (1b) comprises a large diameter section (1b1) and a small diameter section (1b2) which are axially connected, the small diameter section (1b2) is located at one end close to the lower core rod (2), and the first limiting wall (1c) is formed between the large diameter section (1b1) and the small diameter section (1b2).

5. The motor stator potting tool according to any one of claims 1 to 4, characterized in that: The lower core rod (2) comprises a first diameter section (21) and a second diameter section (22) which are axially connected, the second diameter section (22) being located at an end away from the upper core rod (1), the diameter of the second diameter section (22) being greater than the diameter of the first diameter section (21), the first step surface (2a) being formed between the first diameter section (21) and the second diameter section (22), and the stator core (3) being sleeved on the outer periphery of the first diameter section (21).

6. The motor stator potting tool according to any one of claims 1 to 4, characterized in that: It also includes a base (4), a stator shell (5) and an upper pressure plate (6); the stator shell (5) is a tubular structure; the stator shell (5) is connected to the upper side wall of the base (4); the lower end of the lower core rod (2) is connected to the upper side wall of the base (4); the upper core rod (1), the lower core rod (2) and the stator core (3) are all located inside the stator shell (5); and the upper pressure plate (6) is connected to the upper end of the stator shell (5).

7. The motor stator potting tool according to claim 6, characterized in that: The lower core rod (2) comprises a core rod body and a connecting portion (23) connected to the axial lower end of the core rod body, the cross-sectional area of ​​the connecting portion (23) is larger than the maximum cross-sectional area of ​​the core rod body, and the connecting portion (23) fits the base (4).

8. The motor stator potting tool according to claim 7, characterized in that: The lower core rod (2) and the base (4) are connected via a threaded connector (A); the stator housing (5) and the base (4) are connected via a threaded connector (A); and the upper pressure plate (6) and the stator housing (5) are connected via a threaded connector (A).

9. The motor stator potting tool according to any one of claims 1 to 4, characterized in that: It also includes a stator winding (7), the stator core (3) has a stator core slot, and the stator winding (7) is embedded in the stator core slot.

10. The motor stator potting tool according to any one of claims 1 to 4, characterized in that: The upper core rod (1) and the lower core rod (2) are made of polytetrafluoroethylene.

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