Large-length-diameter-ratio stator winding iron core end shaping tool

Abstract

The invention discloses a large-length-diameter-ratio stator winding iron core end shaping tool which comprises a mandrel I, a mandrel II, a pressing ring I, a mandrel III, a pressing ring II and a pressing block used for applying pressure to the mandrel I to enable the mandrel I to be flush with the end face of the pressing block. The mandrel III and the pressing ring II are both of a stepped rotary body structure, a shaft hole and a stepped hole are formed in the mandrel III and the pressing ring II respectively, the mandrel III is assembled in the stepped hole, and a mounting groove I is formed between the hole wall of the stepped hole and the outer wall of the mandrel III in a clamped mode. The structures of the mandrel I and the pressing ring I are the same as those of the mandrel III and the pressing ring II respectively, the mandrel I is assembled in a stepped hole of the pressing ring I, and a mounting groove II is formed between the hole wall of the stepped hole of the pressing ring I and the outer wall of the mandrel I in a clamping mode. During working, the two ends of the mandrel II are embedded into the shaft holes of the mandrel III and the mandrel I respectively, the two ends of the stator winding iron core are embedded into the mounting groove I and the mounting groove II respectively, and the outgoing line penetrates through the slot of the mandrel I and extends into the accommodating groove of the pressing block. The tool is high in pressure bearing capacity, the deformation of the iron core is small in the shaping process, and the winding is not damaged.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of electric machines, in particular to a large-length-diameter-ratio stator winding core end shaping tool. BACKGROUND

[0002] The stator of an electric machine is assembled by a casing and a stator winding core, and the two are in interference fit, and the casing is used to heat and assemble the stator winding core, before the stator winding core is assembled into the electric machine casing, the part of the stator winding core extending out of the stator core needs to be shaped by a tool, so as to prevent the winding core end from contacting the casing and subsequent electric machine assembly parts, thereby ensuring the assembly size, electrical performance and insulation.

[0003] The shaping process needs to exert pressure on the stator winding core through the shaping tool, the existing stator winding core end shaping tool has a short positioning size relative to the slender core, and the function of preventing the core from being deformed under pressure is poor, the stator core with a large length-diameter ratio is prone to deformation, cracking, winding insulation damage and other quality problems under stress, thereby failing to be normally assembled with the electric machine casing. SUMMARY

[0004] The application aims to provide a large-length-diameter-ratio stator winding core end shaping tool, which comprises a core shaft I, a core shaft II, a pressing ring I, a core shaft III, a pressing ring II and a pressing block.

[0005] The core shaft III is a stepped rotary body structure in the shape of T, and is internally provided with a shaft hole penetrating through the core shaft III.

[0006] The pressing ring II is a stepped rotary body structure, and is internally provided with a stepped hole penetrating through the pressing ring II. The core shaft III is assembled in the stepped hole, so that an installation groove I is formed between the hole wall of the stepped hole and the outer wall of the core shaft III.

[0007] The core shaft I and the pressing ring I have the same structure as the core shaft III and the pressing ring II respectively, and are oppositely arranged with the core shaft III and the pressing ring II. The horizontal section of the T-shaped core shaft I is provided with a slot.

[0008] The core shaft I is assembled in the stepped hole of the pressing ring I, and an installation groove II is formed between the hole wall of the stepped hole of the pressing ring I and the outer wall of the core shaft I.

[0009] The core shaft II is a stepped rotary body structure.

[0010] The pressing block is a block structure, which is used to exert pressure on the core shaft I, so that the core shaft I is forced downward until the end face is flush with the end face of the pressing block, and a containing groove with a slot opening outward is further formed in the outer wall of the pressing block.

[0011] In operation, the two ends of the mandrel II are respectively embedded into the shaft holes of the mandrel III and the mandrel I, the two ends of the stator winding core are respectively embedded into the mounting slot I and the mounting slot II, and the lead-out wire of the end of the stator winding core is inserted into the accommodating slot through the insertion slot.

[0012] Further, the mandrel III sequentially comprises a large-diameter segment, a circular-truncated transition segment and a small-diameter segment arranged coaxially. The large end surface and the small end surface of the circular-truncated transition segment are respectively transitionally connected with the large-diameter segment and the small-diameter segment.

[0013] The pressing ring II is in a cylindrical shape, and the stepped hole sequentially comprises a large-diameter hole segment, a circular-truncated transition hole segment and a small-diameter hole segment arranged coaxially. The large end surface and the small end surface of the circular-truncated transition hole segment are respectively transitionally connected with the large-diameter hole segment and the small-diameter hole segment.

[0014] In operation, the mandrel III is embedded into the stepped hole of the pressing ring II, so that the outer wall of the large-diameter segment of the mandrel III is attached to the hole wall of the small-diameter hole segment of the pressing ring II, and the mounting slot I is clamped by the circular-truncated transition hole segment and the large-diameter hole segment of the pressing ring II, and the large-diameter segment, the circular-truncated transition segment and the small-diameter segment of the mandrel III.

[0015] Further, the inner and outer wall sizes of the stator winding core are respectively matched with the size of the small-diameter segment of the mandrel III and the size of the large-diameter hole segment of the pressing ring II.

[0016] The inner and outer wall sizes of the end of the stator winding core are respectively matched with the size of the circular-truncated transition segment of the mandrel III and the size of the circular-truncated transition hole segment of the pressing ring II.

[0017] The pressing ring I has the same structure as the pressing ring II.

[0018] Further, the two ends, the shaft holes of the mandrel I and the mandrel III, and the stepped holes of the pressing ring I and the pressing ring II are chamfered.

[0019] Further, the mandrel II comprises a middle shaft arranged coaxially, and end shafts arranged at the two ends of the middle shaft. The diameter of the end shaft is smaller than the diameter of the middle shaft.

[0020] The size of the middle shaft is matched with the size of the inner hole of the stator winding core. The size of the end shaft is matched with the size of the shaft hole of the mandrel I and the mandrel III.

[0021] Further, the length-diameter ratio of the stator winding core is The stator winding core with the length-diameter ratio greater than 3 is a large-length-diameter-ratio stator winding core.

[0022] Further, the material of the mandrel I is aluminum alloy, which is processed through turning, milling and tooling procedures.

[0023] The materials of the mandrel II and the mandrel III are aluminum alloy, which is processed through turning procedures.

[0024] The material of the pressing ring I and the pressing ring II is aluminum alloy, which is processed through turning process.

[0025] The material of the pressing block is aluminum alloy, which is processed through turning, milling and tooling processes.

[0026] Further, the assembly process using the tooling includes the following steps:

[0027] S1, placing the pressing ring II on a horizontal plate, and assembling the mandrel III in the stepped hole of the pressing ring II.

[0028] S2, assembling the mandrel II into the shaft hole of the mandrel III.

[0029] S3, inserting the stator winding core into the installation slot I formed by the combination of the pressing ring II and the mandrel III.

[0030] S4, assembling the pressing ring I at the other end of the stator winding core.

[0031] The lead-out wire of the stator winding core extends out of the stepped hole of the pressing ring I.

[0032] S5, aligning the insertion slot of the mandrel I with the lead-out wire, and assembling the mandrel I into the stepped hole of the pressing ring I.

[0033] S6, placing the pressing block on the mandrel I, and applying pressure to the pressing block to make the mandrel I bear downward force until the large end face of the mandrel I is flush with the end face of the pressing ring I, at which time the end portions of the stator winding core at the upper and lower ends are simultaneously shaped.

[0034] S7, removing the pressing block, and using a wooden stick to knock out the mandrel II and the mandrel I from the inner hole of the stator winding core. Then, using a wooden stick to knock out the mandrel III from the other end through the inner hole of the stator winding core. Finally, removing the pressing ring I and the pressing ring II from the two ends of the stator winding core.

[0035] The technical effects of the present application are self-evident, and the beneficial effects of the present application are as follows:

[0036] 1. The end shaping design special tooling of the present application has strong pressure bearing capacity, which can ensure that the iron core has small deformation and the winding is not damaged during the end shaping process of the slender stator winding core.

[0037] 2. The end shaping design special tooling of the present application has simple structure, reliable positioning, low cost and convenient and reliable operation. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 is a structure diagram of a stator winding core with a large length-diameter ratio, wherein Figure 1 (a) is an elevation view, Figure 1 (b) is a left view;

[0039] Figure 2 is a structure diagram of an end shaping tooling for a stator winding core.

[0040] Figure 3 Figure 1 is a schematic diagram of a mandrel I; Figure 1 (a) is a plan view, Figure 1 (b) is an elevation view;

[0041] Figure 4 Figure 2 is a schematic diagram of a mandrel II;

[0042] Figure 5 Figure 3 is a schematic diagram of a pressing ring I;

[0043] Figure 6 Figure 4 is a schematic diagram of a mandrel III;

[0044] Figure 7 Figure 5 is a schematic diagram of a pressing ring II;

[0045] Figure 8 Figure 6 is a schematic diagram of a pressing block.

[0046] In the figure: mandrel I 101, mandrel II 102, pressing ring I 103, mandrel III 104, pressing ring II 105, pressing block 106, stator winding core 2, stator winding core end 3, lead wire 4;

[0047] insertion slot 1011, large-diameter section I 1041, circular table transition section I 1042, small-diameter section I 1043, large-diameter section II 1051, circular table transition section II 1052, small-diameter section II 1053, stepped hole 1054, accommodation slot 1061. DETAILED DESCRIPTION

[0048] The present application will be further described below in conjunction with examples, but should not be understood as limiting the above-mentioned subject matter of the present application to the following examples. Various substitutions and changes can be made according to ordinary technical knowledge and conventional means in the art without departing from the technical idea of the present application, and all such substitutions and changes should be included in the protection scope of the present application.

[0049] Example 1:

[0050] A large-length-diameter-ratio stator winding core end shaping tool includes a mandrel I 101, a mandrel II 102, a pressing ring I 103, a mandrel III 104, a pressing ring II 105, and a pressing block 106.

[0051] The mandrel III 104 is a stepped rotary body structure in the shape of a T, and has an axial hole passing through the mandrel III 104.

[0052] The pressing ring II 105 is a stepped rotary body structure, and has a stepped hole 1054 passing through the pressing ring II 105. The mandrel III 104 is assembled in the stepped hole 1054, so that an installation slot I is formed between the hole wall of the stepped hole 1054 and the outer wall of the mandrel III 104.

[0053] The structures of mandrel I 101 and pressure ring I 103 are the same as those of mandrel III 104 and pressure ring II 105, and are arranged opposite to mandrel III 104 and pressure ring II 105. The horizontal section of the T-shaped mandrel I 101 is provided with a slot 1011.

[0054] The mandrel I101 is assembled in the stepped hole of the pressure ring I103, and a mounting groove II is formed by the stepped hole wall of the pressure ring I103 and the outer wall of the mandrel I101.

[0055] The mandrel II102 has a stepped rotating structure.

[0056] The block structure of the pressure block 106 is used to apply pressure to the mandrel I101, so that the mandrel I101 is subjected to downward force until the end face is flush with the end face of the pressure block 106, and the outer wall of the pressure block 106 is also provided with an outward-facing receiving groove 1061.

[0057] During operation, the two ends of the mandrel II 102 are respectively embedded in the shaft holes of the mandrel III 104 and the mandrel I 101, the two ends of the stator winding core 2 are respectively embedded in the mounting slot I and the mounting slot II, and the lead wire 4 at the end of the stator winding core passes through the slot 1011 and extends into the receiving slot 1061.

[0058] Example 2:

[0059] The main structure of this embodiment is the same as that of Embodiment 1. Further, the mandrel Ⅲ104 includes a large-diameter section 1041, a frustum transition section 1042, and a small-diameter section 1043 arranged coaxially. The large end face and the small end face of the frustum transition section 1042 are respectively transitionally connected to the large-diameter section 1041 and the small-diameter section 1043.

[0060] The pressure ring II 105 is cylindrical, and the stepped hole 1054 includes a large-diameter hole section 1051, a frustum transition hole section 1052, and a small-diameter hole section 1053 arranged coaxially. The large end face and the small end face of the frustum transition hole section 1052 are respectively transitionally connected to the large-diameter hole section 1051 and the small-diameter hole section 1053.

[0061] During operation, the mandrel Ⅲ104 is embedded in the stepped hole 1054 of the pressure ring Ⅱ105, so that the outer wall of the large diameter section 1041 of the mandrel Ⅲ104 fits against the hole wall of the small diameter section 1053 of the pressure ring Ⅱ105. The mounting groove Ⅰ is formed by the frustum transition hole section 1052 of the pressure ring Ⅱ105, the large diameter hole section 1051, and the large diameter section 1041, frustum transition section 1042, and small diameter section 1043 of the mandrel Ⅲ104.

[0062] Example 3:

[0063] The main structure of this embodiment is the same as that of embodiment 2. Furthermore, the inner and outer wall dimensions of the stator winding core 2 are adapted to the dimensions of the small diameter section 1043 of the core shaft Ⅲ104 and the large diameter hole section 1051 of the pressure ring Ⅱ105, respectively.

[0064] The inner and outer wall dimensions of the stator winding core end 3 are respectively adapted to the dimensions of the frustum transition section 1042 of the core shaft Ⅲ104 and the dimensions of the frustum transition hole section 1052 of the pressure ring Ⅱ105.

[0065] The structure of pressure ring I103 is the same as that of pressure ring II105.

[0066] Example 4:

[0067] The main structure of this embodiment is the same as any one of embodiments 1 to 3. Furthermore, the two ends of the mandrel I 101 and mandrel III 104, the shaft holes, and the stepped holes of the pressure rings I 103 and II 105 are chamfered.

[0068] Example 5:

[0069] The main structure of this embodiment is the same as any one of embodiments 1 to 4. Further, see [link to embodiment 1]. Figure 4 The mandrel II 102 includes a central shaft coaxially arranged and end shafts disposed at both ends of the central shaft. The diameter of the end shafts is smaller than the diameter of the central shaft.

[0070] The dimensions of the central shaft are adapted to the inner diameter of the stator winding core 2. The dimensions of the end shafts are adapted to the dimensions of the shaft holes of mandrel I 101 and mandrel III 104.

[0071] Example 6:

[0072] The main structure of this embodiment is the same as any one of embodiments 1 to 5. Furthermore, the length-to-diameter ratio of the stator winding core 2 is... A core with a length-to-diameter ratio greater than 3 is a stator winding core with a large length-to-diameter ratio.

[0073] Example 7:

[0074] The main structure of this embodiment is the same as any one of embodiments 1 to 6. Furthermore, the mandrel I101 is made of aluminum alloy and is processed by turning, milling and fitting.

[0075] The mandrels II102 and III104 are made of aluminum alloy and are machined through a machining process.

[0076] The pressure rings I103 and II105 are made of aluminum alloy and are machined through a machining process.

[0077] The pressure block 106 is made of aluminum alloy and is manufactured through turning, milling, and fitting processes.

[0078] Example 8:

[0079] The main structure of this embodiment is the same as any one of embodiments 1 to 7. Furthermore, the assembly process using the tooling includes the following steps:

[0080] S1. Place the pressure ring II 105 on a horizontal plate and assemble the mandrel III 104 in the stepped hole 1054 of the pressure ring II 105.

[0081] S2. Insert mandrel II 102 into the shaft hole of mandrel III 104.

[0082] S3. Insert the stator winding core 2 into the mounting slot I formed by the combination of pressure ring II 105 and spindle III 104.

[0083] S4. Install pressure ring I103 at the other end of stator winding core 2.

[0084] The lead wire 4 of the stator winding core extends out of the stepped hole of the pressure ring I103.

[0085] S5. Align the slot 1011 of the mandrel I101 with the lead wire 4 and insert it into the stepped hole of the pressure ring I103.

[0086] S6. Place the pressure block 106 on the mandrel I101 and apply pressure to the pressure block 106 so that the mandrel I101 is subjected to downward force until the large end face of the mandrel I101 is flush with the end face of the pressure ring I103. At this time, the upper and lower ends of the stator winding core 2 are simultaneously shaped.

[0087] S7. Remove the pressure block 106, and use a wooden stick to push the mandrel II 102 and mandrel I 101 out of the inner hole of the stator winding core 2. Then, use a wooden stick to push out the mandrel III 104 from the other end through the inner hole of the stator winding core 2. Finally, remove the pressure rings I 103 and II 105 from both ends of the stator winding core.

[0088] Example 9:

[0089] The main structure of this embodiment is the same as any one of embodiments 1 to 8. Furthermore, this embodiment discloses a shaping fixture for the end of a slender stator winding core. It has a simple structure, reliable clamping and positioning, and convenient operation. It is composed of a mandrel I 101, a mandrel II 102, a pressure ring I 103, a mandrel III 104, a pressure ring II 105, and a pressure block 106.

[0090] Figure 1 In the structural diagram of the slender stator winding core, the ends of the stator winding embedded in the stator core need to be shaped to ensure the size and shape of the stator winding ends, while the stator core does not deform.

[0091] The tooling assembly and debugging process is as follows: Figure 2The structural diagram of the shaping fixture is shown.

[0092] The pressure ring II 105 is placed on a horizontal plate, and then the mandrel III 104 is installed into the inner hole of the pressure ring II 105 (assembly gap 0.1mm).

[0093] Mandrel II 102 is inserted into the inner hole of mandrel III 104 (assembly clearance 0.1mm);

[0094] Mandrel I101 is installed, the inner hole of mandrel I101 is assembled with mandrel II102 (assembly clearance 0.1mm), and the outer circle of mandrel I101 is assembled with the inner hole of pressure ring I103 (assembly clearance 0.1mm).

[0095] The pressure block 106 is an auxiliary tool used in the tooling process.

[0096] Example 10:

[0097] The main structure of this embodiment is the same as any one of embodiments 1 to 8. Furthermore, the tooling usage process is as follows:

[0098] 1) Place the pressure ring II 105 on a horizontal plate, and then insert the mandrel III 104 into the inner hole of the pressure ring II 105;

[0099] 2) Insert mandrel II 102 into the inner hole of mandrel III 104;

[0100] 3) The inner hole of the stator winding core is inserted into the pressure ring II105 through the mandrel II102. The inner hole of the core is assembled with the outer circle of the small end of the mandrel III104, and the outer circle of the core is assembled with the inner hole of the pressure ring II105. At this time, the winding end of the lower end of the stator winding core initially enters the shaping area between the pressure ring II and the mandrel III. The center of the stator core is consistent with the center of the shaping fixture.

[0101] 4) The lead wires at the upper end of the stator winding core pass through the inner hole of the pressure ring I103, and the inner hole of the pressure ring I is assembled with the outer circle of the core.

[0102] 5) The outer circle of the small end of the mandrel I101 is inserted into the inner hole of the iron core, and the outer circle of the large end is initially inserted into the inner hole of the pressure ring I103. The lead wire of the winding end is pulled out from the slot on the side of the large end of the mandrel I. At this time, the winding end of the upper end of the stator winding iron core initially enters the area between the pressure ring I103 and the mandrel I101.

[0103] 6) Place the pressure block 106 on the mandrel I 101 and apply pressure to the pressure block 106. The mandrel I 101 is subjected to downward force until the large end face of the mandrel I 101 is flush with the end face of the pressure ring I 103. At this time, the upper and lower ends of the stator winding are simultaneously shaped.

[0104] 7) Use a thin bakelite rod to push out mandrels II102 and I101 from the stator winding core by passing them through the inner hole of mandrel III104. Then use the bakelite rod to push out mandrel III104 from the inner hole of the stator winding core. Finally, remove pressure rings I103 and II105 from both ends of the stator winding core.

[0105] During the shaping process, the two ends of the stator winding core and the core are subjected to force simultaneously. The mandrel II102 plays a supporting role inside the slender core, ensuring the coaxiality of the shaping fixture and the stator winding core, and subjecting the core to force in a unified axial direction to prevent the core from deforming under stress.

[0106] In this embodiment, the stator winding core end shaping fixture is assembled from 7 types of components.

[0107] The mandrel I101 is made of aluminum alloy and is manufactured using turning, milling, and fitting processes.

[0108] Mandrels II102 and III104 are made of aluminum alloy and are machined using a turning process.

[0109] Pressure ring I103 and pressure ring II105 are made of aluminum alloy and are machined using a machining process.

[0110] The pressure block 106 is made of aluminum alloy and is manufactured using turning, milling, and fitting processes.

[0111] Finally, press Figure 2 assembly.

Claims

1. A tooling for shaping the ends of a stator winding core with a large length-to-diameter ratio, characterized in that: It includes mandrel I (101), mandrel II (102), pressure ring I (103), mandrel III (104), pressure ring II (105), and pressure block (106); The mandrel Ⅲ (104) is a T-shaped stepped rotating body structure with a shaft hole that passes through the mandrel Ⅲ (104) inside; The pressure ring II (105) is a stepped rotating body structure with a stepped hole (1054) penetrating the pressure ring II (105) inside; a mandrel III (104) is assembled in the stepped hole (1054) so ​​that the hole wall of the stepped hole (1054) and the outer wall of the mandrel III (104) form an installation groove I. The structures of the mandrel I (101) and pressure ring I (103) are the same as those of the mandrel III (104) and pressure ring II (105), and are arranged opposite to the mandrel III (104) and pressure ring II (105); the horizontal section of the T-shaped mandrel I (101) is provided with a slot (1011). The mandrel I (101) is assembled in the stepped hole of the pressure ring I (103), and a mounting groove II is formed by the stepped hole wall of the pressure ring I (103) and the outer wall of the mandrel I (101). The mandrel II (102) is a stepped rotating body structure; The block (106) has a block-shaped structure and is used to apply pressure to the mandrel I (101), so that the mandrel I (101) is subjected to downward force until the end face is flush with the end face of the block (106). The outer wall of the block (106) is also provided with a receiving groove (1061) with the slot facing outward. During operation, the two ends of the mandrel II (102) are respectively embedded in the shaft holes of mandrel III (104) and mandrel I (101), the two ends of the stator winding core (2) are respectively embedded in the mounting slot I and mounting slot II, and the lead wire (4) at the end of the stator winding core passes through the slot (1011) and extends into the receiving slot (1061).

2. The end-shaping fixture for a stator winding core with a large length-to-diameter ratio according to claim 1, characterized in that: The mandrel III (104) includes a large-diameter section (1041), a frustum transition section (1042), and a small-diameter section (1043) arranged coaxially; the large end face and the small end face of the frustum transition section (1042) are respectively transitionally connected to the large-diameter section (1041) and the small-diameter section (1043); The pressure ring II (105) is cylindrical, and the stepped hole (1054) includes a large-diameter hole section (1051), a frustum transition hole section (1052), and a small-diameter hole section (1053) arranged coaxially; the large end face and the small end face of the frustum transition hole section (1052) are respectively connected to the large-diameter hole section (1051) and the small-diameter hole section (1053); During operation, the mandrel Ⅲ (104) is embedded in the stepped hole (1054) of the pressure ring Ⅱ (105), so that the outer wall of the large diameter section (1041) of the mandrel Ⅲ (104) fits against the hole wall of the small diameter section (1053) of the pressure ring Ⅱ (105), and the mounting groove Ⅰ is formed by the frustum transition hole section (1052) and the large diameter hole section (1051) of the pressure ring Ⅱ (105), and the large diameter section (1041), frustum transition section (1042) and small diameter section (1043) of the mandrel Ⅲ (104).

3. The end-shaping fixture for a stator winding core with a large aspect ratio according to claim 2, characterized in that: The inner and outer wall dimensions of the stator winding core (2) are respectively adapted to the dimensions of the small diameter section (1043) of the core shaft III (104) and the large diameter hole section (1051) of the pressure ring II (105); The inner and outer wall dimensions of the stator winding core end (3) are respectively adapted to the dimensions of the frustum transition section (1042) of the core shaft III (104) and the frustum transition hole section (1052) of the pressure ring II (105); The structure of ring I (103) is the same as that of pressure ring II (105).

4. A stator winding core end shaping fixture with a large length-to-diameter ratio according to claim 1 or 2, characterized in that: The two ends of mandrel I (101) and mandrel III (104), the shaft holes, and the stepped holes of pressure ring I (103) and pressure ring II (105) are chamfered.

5. The end-shaping fixture for a stator winding core with a large length-to-diameter ratio according to claim 1, characterized in that: The mandrel II (102) includes a central shaft coaxially arranged and end shafts disposed at both ends of the central shaft; the diameter of the end shafts is smaller than the diameter of the central shaft; The dimensions of the central shaft are adapted to the inner hole dimensions of the stator winding core (2); the dimensions of the end shaft are adapted to the dimensions of the shaft holes of core shaft I (101) and core shaft III (104).

6. The end-shaping fixture for a stator winding core with a large length-to-diameter ratio according to claim 1, characterized in that: The stator winding core (2) has a length-to-diameter ratio A core with a length-to-diameter ratio greater than 3 is a stator winding core with a large length-to-diameter ratio.

7. The end-shaping fixture for a stator winding core with a large length-to-diameter ratio according to claim 1, characterized in that: The mandrel I (101) is made of aluminum alloy and is manufactured by turning, milling and fitting processes; The mandrels II (102) and III (104) are made of aluminum alloy and are machined by a machining process; The pressure rings I (103) and II (105) are made of aluminum alloy and are machined by a machining process; The pressure block (106) is made of aluminum alloy and is processed by turning, milling and fitting.

8. A stator winding core end shaping fixture with a large aspect ratio according to any one of claims 1 to 7, characterized in that, The assembly process using the aforementioned tooling includes the following steps: S1. Place the pressure ring II (105) on a horizontal plate and assemble the mandrel III (104) in the stepped hole (1054) of the pressure ring II (105). S2. Insert mandrel II (102) into the shaft hole of mandrel III (104); S3. Insert the stator winding core (2) into the mounting groove I formed by the combination of pressure ring II (105) and spindle III (104); S4. Install pressure ring I (103) at the other end of the stator winding core (2). The lead wire (4) of the stator winding core extends out of the stepped hole of the pressure ring I (103); S5. Align the slot (1011) of the mandrel I (101) with the lead wire (4) and insert it into the stepped hole of the pressure ring I (103); S6. Place the pressure block (106) on the mandrel I (101) and apply pressure to the pressure block (106) so that the mandrel I (101) is subjected to downward force until the large end face of the mandrel I (101) is flush with the end face of the pressure ring I (103). At this time, the upper and lower ends of the stator winding core (2) are simultaneously shaped. S7. Remove the pressure block (106), and use a wooden stick to push the mandrel II (102) and mandrel I (101) out of the inner hole of the stator winding core (2); then use a wooden stick to push out the mandrel III (104) from the other end through the inner hole of the stator winding core (2); finally, remove the pressure ring I (103) and pressure ring II (105) from both ends of the stator winding core.

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