A stator core lamination pressing tool and a pressing method

Abstract

The application discloses a stator core stacking tool, which comprises a stator core, a bottom die, a lateral pressing assembly and a vertical pressing assembly. The stator core comprises a punching sheet assembly, side plates arranged on both sides of the punching sheet assembly and end plates arranged at both ends of the punching sheet assembly. The punching sheet assembly is formed by stacking a plurality of stator punching sheets in sequence. A plurality of core grooves for embedding coils are arranged on the stator punching sheets. Core teeth are formed between two adjacent core grooves. A first flat pressing surface is arranged on the bottom die. The openings of the core grooves face the first flat pressing surface. The vertical pressing assembly is used for providing a vertical pressure of the stator core, which is perpendicular to the first flat pressing surface, so that the tooth surface of the stator core is tightly attached to the first flat pressing surface. The lateral pressing assembly is provided with a second flat pressing surface. The lateral pressing assembly is used for providing a lateral pressure of the stator core, which is parallel to the first flat pressing surface, so that the second flat pressing surface is tightly attached to the outside of the side plates. The application has the advantages that the tooth surface and the side surface of the stator core are guaranteed to be flat.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and specifically to a stator core stacking fixture and stacking method. Background Technology

[0002] Currently, stator core lamination fixtures are widely used in the rail transit industry as a power source. The stator core of these fixtures is a flat, plate-like structure, formed by stacking a certain number of stator laminations. The core surface is a single plane, with core slots arranged in a straight line. The coils, similar to those in ordinary asynchronous motors, are sequentially embedded in the core slots. An installation interface is located on the back of the core for mounting and connection to the train bogie, essentially functioning as the stator of a rotating electric motor. When the stator is energized with a three-phase power supply, the stator coils generate traveling wave magnetic fields on the parallel and normal planes of the stator. The induction plate (or induction pole) is located on the traction locomotive track, functioning as the rotor of a rotating electric motor. The induction plate is also a flat, plate-like structure, laid on the maglev track. It is composed of steel-aluminum composite plates and is used for magnetic and current conduction.

[0003] The stator core and induction plate of the linear motor are respectively installed on the train body and the train track. The stator core and induction plate are spaced a certain distance apart to form the mechanical air gap of the linear motor. The mechanical air gap of the linear motor is an important structure of the motor, and the size and uniformity of the air gap have a great influence on the performance of the linear motor.

[0004] Based on the characteristics of the stator core of a traction linear motor, it is known that the teeth of the stator core not only generate thrust in the forward direction but also generate suction force on the induction plate in the normal direction. Only when the core surface is flat can the thrust and suction force be evenly distributed. The better the flatness of the core, the more stable the thrust and suction force of the linear motor. In addition, since the core surface of the linear motor has slots for embedding coils, a high degree of uniformity in the stacked stator laminations and a high degree of flatness within the core slots are more conducive to coil embedding and insulation protection of the coils.

[0005] In actual production, a pressure platform is usually used to stack the core tooth surfaces. Although this method is quick, it has the following disadvantages: 1) It can only improve the flatness of the core tooth surfaces. During the stacking process, the sides of each stator lamination may be deformed, resulting in unevenness on both sides of the stator lamination, uneven distribution of thrust and normal suction, and instability; 2) The deformation of the core slots of the stator laminations affects the flatness of the slots, which is not conducive to the coil mounting and insulation protection. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a stator core stacking fixture and stacking method that can ensure that the stator core tooth surface and side surface are flat.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] A stator core stacking fixture includes a stator core, a bottom mold, a lateral pressing assembly, and a vertical pressing assembly. The stator core includes a lamination assembly, side plates on both sides of the lamination assembly, and end plates at both ends of the lamination assembly. The lamination assembly is formed by sequentially stacking multiple stator laminations. Each stator lamination has multiple core slots for embedding coils, and core teeth are formed between adjacent core slots. The bottom mold has a first flat pressing surface, and the openings of the core slots face the first flat pressing surface. The vertical pressing assembly provides vertical pressure perpendicular to the first flat pressing surface to the stator core, so that the stator core teeth are in close contact with the first flat pressing surface. The lateral pressing assembly has a second flat pressing surface, which provides lateral pressure parallel to the first flat pressing surface to the stator core, so that the second flat pressing surface is in close contact with the outer side of the side plate.

[0009] As a further improvement to the above technical solution:

[0010] The lateral pressurization assembly includes a first side mold, a second side mold, and a locking assembly. The first side mold and the second side mold are each provided with a second flat pressing surface on opposite sides. The first side mold and the second side mold are detachably connected to the bottom mold and locked by the locking assembly.

[0011] The locking assembly includes a locking screw, which passes through the first side mold, the side plate, the core groove, and the second side mold, and a first locking nut is provided on the outside of the first side mold and the second side mold.

[0012] The vertical pressurizing assembly includes multiple pressure blocks for pressing onto the stator core. The multiple pressure blocks are arranged at intervals along the length of the stator core. Each pressure block has a first oblong hole at both ends. The first side mold and the second side mold each have a second oblong hole. The first oblong holes at both ends of the pressure block are respectively connected to the corresponding second oblong holes through threaded fasteners to adjust the pressure position of the pressure block on the stator core and the magnitude of the vertical pressure on the stator core.

[0013] The stacking fixture also includes a connecting screw for connecting stator laminations. The connecting screw passes through the first side die, the side plate, the stator lamination, and the second side die, and a second locking nut is provided on the outside of the first side die and the second side die.

[0014] The stacking fixture also includes a grooved rod for ensuring the flatness of the core slot. The grooved rod is inserted into the core slot and abuts against the slot wall.

[0015] The stacking fixture also includes a frame, which has an installation platform for installing the bottom mold and a connection part for connecting with external equipment. The connection part has multiple mounting holes, which are arranged circumferentially to adjust the installation angle between the frame and the external equipment.

[0016] The side plate is provided with multiple pressing teeth, and the multiple pressing teeth are arranged in a one-to-one correspondence with the iron core teeth. Reinforcing ribs are provided between the side plates on both sides.

[0017] The bottom mold is provided with positioning steps for positioning the first side mold and the second side mold, and observation holes for observing the stacking effect.

[0018] A method for stacking stator cores includes the following steps:

[0019] S1. Install the bottom mold on the mounting platform of the frame, and connect the first side mold to the bottom mold;

[0020] S2. Adjust the mounting angle of the frame through the mounting holes so that the bottom mold faces the side. Place the side plate on the first side mold and insert the connecting screw. Gradually place the stator laminations on the connecting screw. When the stator laminations are stacked to a certain thickness, place the slot bar. Then continue to place the remaining stator laminations and side plates.

[0021] S3. Adjust the mounting angle of the frame through the mounting holes so that the bottom mold faces upward. Install the second side mold onto the bottom mold. Then install the pressure block on the first side mold and the second side mold. Observe the degree of contact between the stator core tooth surface and the first flat pressure surface through the observation hole. Adjust the vertical pressure of the pressure block through the threaded fasteners so that the stator core tooth surface is completely in contact with the first flat pressure surface.

[0022] S4. Lock the first side mold and the second side mold by locking the locking assembly, so that the second flat pressing surface abuts against the outer side of the corresponding side plate respectively;

[0023] S5. Tighten the second locking nut to secure the connecting screw, and position and weld the end plate and reinforcing rib.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] The stator core stacking fixture disclosed in this invention applies vertical pressure to the stator core through a vertical pressure assembly, causing the tooth surface of the lamination assembly to fit tightly against the first flat pressing surface on the bottom die, ensuring the flatness of the stator core tooth surface. Furthermore, a lateral pressure assembly applies lateral pressure to the stator core, causing the second flat pressing surface to fit tightly against the side plate, ensuring the flatness of the stator core tooth side surface. Since both the tooth surface and side surface of the stator core are flat, the side surface of the stator core will not deform under vertical pressure and will remain flat. This helps ensure a uniform and stable distribution of the thrust and normal suction force generated by the stator core during operation.

[0026] The stator core stacking method disclosed in this invention has simple steps and can maintain the flatness of the side surface and core slot of the stator core during the vertical stacking process, which is beneficial to improving the uniformity and stability of the thrust and normal suction force generated by the stator core during operation. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the main structure of the stator core of the stator core stacking fixture of the present invention.

[0028] Figure 2 This is a top view of the stator core structure of the stator core stacking fixture of the present invention.

[0029] Figure 3 This is a schematic diagram of the stator lamination structure of the stator core stacking fixture of the present invention.

[0030] Figure 4 This is a schematic diagram of the grooved bar structure of the stator core stacking tooling of the present invention.

[0031] Figure 5 This is a three-dimensional structural diagram of the stator core stacking fixture of the present invention.

[0032] Figure 6 This is an exploded view of the stator core stacking fixture of the present invention.

[0033] Figure 7 This is a three-dimensional structural diagram of the stator core stacking fixture of the present invention after being rotated 90 degrees.

[0034] Figure 8 This is a three-dimensional structural diagram of the bottom mold and the first side mold of the stator core stacking fixture of the present invention.

[0035] Figure 9 This is a three-dimensional structural diagram of the second side mold of the stator core stacking tooling of the present invention.

[0036] Figure 10 This is a three-dimensional structural diagram of the vertical pressurizing component of the stator core stacking fixture of the present invention.

[0037] Figure 11 This is a three-dimensional structural diagram of the installation platform for the stator core stacking fixture of the present invention.

[0038] The labels in the diagram represent: 1. Stator core; 11. Lamination assembly; 12. Side plate; 121. Pressing tooth section; 122. Reinforcing rib; 13. End plate; 14. Stator lamination; 141. Core slot; 142. Core tooth; 2. Bottom mold; 21. First flat pressing surface; 22. Positioning step; 23. Observation hole; 3. Lateral pressing assembly; 31. Second flat pressing surface; 32. First side mold; 33. Second side mold; 34. Locking assembly; 341. Locking screw; 35. Second oblong hole; 36. First locking nut; 4. Vertical pressing assembly; 41. Pressure block; 411. First oblong hole; 6. Threaded fastener; 71. Connecting screw; 72. Second locking nut; 8. Groove bar; 9. Frame; 91. Mounting platform; 92. Connecting part; 921. Mounting hole. Detailed Implementation

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0042] In this application, unless otherwise expressly specified and limited, the terms "assembly," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] Example 1

[0044] Figures 1 to 11An embodiment of the present invention is shown. This embodiment of the stator core stacking fixture includes a stator core 1, a bottom mold 2, a lateral pressing assembly 3, and a vertical pressing assembly 4. The stator core 1 includes a lamination assembly 11, side plates 12 disposed on both sides of the lamination assembly 11, and end plates 13 disposed at both ends of the lamination assembly 11. The lamination assembly 11 is formed by sequentially stacking multiple stator laminations 14. Each stator lamination 14 has multiple core slots 141 for embedding coils, and core teeth 14 are formed between adjacent core slots 141. 2. The bottom mold 2 is provided with a first flat pressing surface 21. The opening of the core groove 141 faces the first flat pressing surface 21. The vertical pressing component 4 is used to provide the stator core 1 with a vertical pressure perpendicular to the first flat pressing surface 21 so that the tooth surface of the stator core 1 fits against the first flat pressing surface 21. The lateral pressing component 3 is provided with a second flat pressing surface 31. The lateral pressing component 3 is used to provide the stator core 1 with a lateral pressure parallel to the first flat pressing surface 21 so that the second flat pressing surface 31 is tightly attached to the side plate 12.

[0045] The stator core stacking fixture applies vertical pressure to the stator core 1 through the vertical pressure component 4, so that the tooth surface of the lamination assembly 11 is tightly fitted with the first flat pressing surface 21 on the bottom mold 2, ensuring the flatness of the tooth surface of the stator core 1. Furthermore, the lateral pressure component 3 applies lateral pressure to the stator core 1, so that the second flat pressing surface 31 is tightly fitted with the side plate 12, ensuring the flatness of the side surface of the stator core 1. Both the tooth surface and the side surface of the stator core 1 are flat, that is, the side surface of the stator core 1 will not deform when subjected to vertical pressure, and will remain flat. This is beneficial to ensuring that the thrust and normal suction generated by the stator core 1 during operation are evenly and stably distributed.

[0046] In this embodiment, the lateral pressurization assembly 3 includes a first side mold 32, a second side mold 33, and a locking assembly 34. The opposite sides of the first side mold 32 and the second side mold 33 are each provided with a second flat pressing surface 31. Both the first side mold 32 and the second side mold 33 are detachably connected to the bottom mold 2 and locked in place by the locking assembly 34. First, the first side mold 32 is installed on the bottom mold 2. Then, the side plate 12 and the lamination assembly 11 are placed, and then the second side mold 33 is installed. The locking assembly 34 locks the first side mold 32 and the second side mold 33, ensuring that the second flat pressing surface 31 is tightly against the outside of the side plate 12, thus guaranteeing the flatness of the stator core 1. Of course, in other embodiments, the first side mold 32 and the bottom mold 2 can also be integrally formed.

[0047] Preferably, in this embodiment, the locking assembly 34 includes a locking screw 341, which passes through the first side mold 32, the side plate 12, the core groove 141, and the second side mold 33. A first locking nut 36 is provided on the outside of the first side mold 32 and the second side mold 33. The locking force, i.e., the lateral pressure, can be adjusted by screwing the first locking nut 36, resulting in a simple structure.

[0048] In this embodiment, the vertical pressing assembly 4 includes multiple pressing blocks 41 for pressing onto the stator core 1. These pressing blocks 41 are spaced apart along the length of the stator core 1. Each pressing block 41 has a first oblong hole 411 at both ends, and the first side mold 32 and the second side mold 33 each have a second oblong hole 35. The first oblong holes 411 at both ends of the pressing block 41 are connected to the corresponding second oblong holes 35 via threaded fasteners 6, thereby adjusting the pressing position of the pressing block 41 on the stator core 1 and the magnitude of the vertical pressure applied to the stator core 1. By adjusting the connection position of the first oblong hole 411 and the second oblong hole 35 according to the fit between the tooth surface of the lamination assembly 11 and the first flat pressing surface 21, the pressing position of the pressing block 41 on the stator core 1 can be finely adjusted. Adjusting the tightness of the threaded fasteners 6 can adjust the magnitude of the pressure applied by the pressing block 41 to the stator core 1, ensuring the flatness of the tooth surface of the stator core 1.

[0049] In this embodiment, the stacking fixture also includes a connecting screw 71 for connecting the stator laminations 14. The connecting screw 71 passes through the first side mold 32, the side plate 12, the stator laminations 14, and the second side mold 33, and a second locking nut 72 is provided on the outside of the first side mold 32 and the second side mold 33. Connecting the stator laminations 14 in series with the connecting screw 71 facilitates the stacking and positioning of the stator laminations 14, and at the same time prevents the stator laminations 14 from moving relative to each other during the stacking process.

[0050] In this embodiment, the lamination fixture also includes a slotting rod 8 for ensuring the flatness of the core slot 141. The slotting rod 8 is inserted into the core slot 141 and abuts against the slot wall of the core slot 141. The slotting rod 8 is inserted into the core slot 141 of the lamination assembly 11 to ensure the flatness of the core slot 141 when the stator core 1 is subjected to vertical and lateral pressure, which is beneficial for coil mounting and insulation protection.

[0051] In this embodiment, the stacking fixture also includes a frame 9. The frame 9 is provided with a mounting platform 91 for mounting the bottom mold 2 and a connecting part 92 for connecting with external equipment. The connecting part 92 is provided with a plurality of mounting holes 921, which are arranged circumferentially at intervals to adjust the mounting angle between the frame 9 and the external equipment. By changing the connection position between the mounting holes 921 and the external equipment, the mounting angle between the frame 9 and the mounting platform 91 can be adjusted, which is beneficial for the serial connection of the stator laminations 14 and the installation of the first side mold 32 and the second side mold 33.

[0052] In this embodiment, the side plate 12 is provided with a plurality of pressing teeth 121, which are arranged one-to-one with the core teeth 142. A reinforcing rib 122 is provided between the two side plates 12. The side plate 12 is adapted to the structure of the stator lamination 14, facilitating coil embedding. The reinforcing rib 122 connects the side plate 12 and the lamination assembly 11 into a single unit, strengthening the overall strength of the stator core 1. Preferably, the end plate 13 is also connected between the two side plates 12.

[0053] In this embodiment, the bottom mold 2 is provided with a positioning step 22 for positioning the first side mold 32 and the second side mold 33, and an observation hole 23 for observing the stacking effect. The positioning step 22 facilitates positioning the installation positions of the first side mold 32 and the second side mold 33, at which time the distance between the first side mold 32 and the second side mold 33 is the thickness of the stator core 1. The observation hole 23 allows observation of the fit between the tooth surface of the lamination assembly 11 and the first flat pressing surface 21, thereby adjusting the vertical pressure of the vertical pressing assembly 4 to ensure that the tooth surface of the lamination assembly 11 is fully fitted with the first flat pressing surface 21, thus achieving a flat tooth surface.

[0054] It should be noted that in this embodiment, the number of the connecting screw 71, locking screw 341, pressure block 41, and grooved rod 8 can be increased or decreased according to the actual working conditions.

[0055] Example 2

[0056] The stator core stacking method of this embodiment includes the following steps:

[0057] S1. Install the bottom mold 2 on the mounting platform 91 of the frame 9, and connect the first side mold 32 to the bottom mold 2;

[0058] S2. Adjust the mounting angle of the frame 9 through the mounting hole 921 so that the bottom mold 2 faces the side. Place the side plate 12 on the first side mold 32 and insert the connecting screw 71. Gradually place the stator laminations 14 on the connecting screw 71. When the stator laminations 14 are stacked to a certain thickness, place the slot bar 8. Then continue to place the remaining stator laminations 14 and side plates 12.

[0059] S3. Adjust the mounting angle of the frame 9 through the mounting hole 921 so that the bottom mold 2 faces upward. Install the second side mold 33 onto the bottom mold 2. Then install the pressure block 41 onto the first side mold 32 and the second side mold 33. Observe the degree of contact between the tooth surface of the stator core 1 and the first flat pressure surface 21 through the observation hole 23. Adjust the vertical pressure of the pressure block 41 through the threaded fastener 6 so that the tooth surface of the stator core 1 is completely in contact with the first flat pressure surface 21.

[0060] S4. Lock the first side mold 32 and the second side mold 33 by locking the locking assembly 34, so that the second flat pressing surface 31 abuts against the outer side of the corresponding side plate 12 respectively;

[0061] S5. The second locking nut 72 secures the connecting screw 71, and positions and welds the end plate 13 and the reinforcing rib 122.

[0062] This stacking method is simple in steps. During the vertical stacking process, it can still keep the side of the stator core 1 and the core slot 141 flat, which is conducive to improving the uniformity and stability of the thrust and normal suction force generated by the stator core 1 during operation.

[0063] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A stator core stacking fixture, characterized in that: The system includes a stator core (1), a bottom mold (2), a lateral pressurizing assembly (3), and a vertical pressurizing assembly (4). The stator core (1) includes a lamination assembly (11), side plates (12) on both sides of the lamination assembly (11), and end plates (13) on both ends of the lamination assembly (11). The lamination assembly (11) is formed by stacking multiple stator laminations (14) in sequence. The stator laminations (14) are provided with multiple core slots (141) for embedding coils. Core teeth (142) are formed between two adjacent core slots (141). The bottom mold (2) is provided with a first flat pressing surface (21). The opening of the core slot (141) faces the first flat pressing surface (21). The vertical pressurizing assembly (4) is used to press the stator core. The stator core (1) provides vertical pressure perpendicular to the first flat pressing surface (21) so that the tooth surface of the stator core (1) is in close contact with the first flat pressing surface (21). The lateral pressing assembly (3) is provided with a second flat pressing surface (31). The lateral pressing assembly (3) is used to provide the stator core (1) with lateral pressure parallel to the first flat pressing surface (21) so that the second flat pressing surface (31) is in close contact with the outside of the side plate (12). The lateral pressing assembly (3) includes a first side mold (32), a second side mold (33) and a locking assembly (34). The first side mold (32) and the second side mold (33) are provided with second flat pressing surfaces (31) on opposite sides. The first side mold (32) and the second side mold (33) are detachable from the bottom mold (2). The connection is disengaged and locked by a locking assembly (34), which includes a locking screw (341). The locking screw (341) passes through the first side mold (32), the side plate (12), the core groove (141), and the second side mold (33), and a first locking nut (36) is provided on the outside of the first side mold (32) and the second side mold (33). The vertical pressure assembly (4) includes a plurality of pressure blocks (41) for pressing on the stator core (1). The plurality of pressure blocks (41) are spaced apart along the length of the stator core (1). Each pressure block (41) has a first waist-shaped hole (411) at both ends. The first side mold (32) and the second side mold (33) have a second waist-shaped hole (35). 1) The first waist-shaped holes (411) at both ends are connected to the corresponding second waist-shaped holes (35) through threaded fasteners (6) to adjust the pressure position of the pressure block (41) on the stator core (1) and the vertical pressure on the stator core (1). The stacking tooling also includes a connecting screw (71) for connecting the stator laminations (14). The connecting screw (71) passes through the first side mold (32), the side plate (12), the stator laminations (14), and the second side mold (33). A second locking nut (72) is provided on the outside of the first side mold (32) and the second side mold (33). The stacking tooling also includes a grooved rod (8) for ensuring the flatness of the core groove (141). The grooved rod (8) is inserted into the core groove (141).The stacking fixture also includes a frame (9) that abuts against the wall of the core slot (141). The frame (9) has an installation platform (91) for mounting the bottom mold (2) and a connecting part (92) for connecting to external equipment. The connecting part (92) has multiple mounting holes (921) spaced circumferentially to adjust the mounting angle between the frame (9) and the external equipment.

2. The stator core stacking fixture according to claim 1, characterized in that: The side plate (12) is provided with a plurality of pressing teeth (121), and the plurality of pressing teeth (121) are arranged in a one-to-one correspondence with the core teeth (142). Reinforcing ribs (122) are provided between the side plates (12) on both sides.

3. The stator core stacking fixture according to claim 2, characterized in that: The bottom mold (2) is provided with positioning steps (22) for positioning the first side mold (32) and the second side mold (33) and observation holes (23) for observing the stacking effect.

4. A stator core stacking method based on the stator core stacking fixture of claim 3, characterized in that: Includes the following steps: S1. Install the bottom mold (2) on the mounting platform (91) of the frame (9) and connect the first side mold (32) to the bottom mold (2); S2. Adjust the mounting angle of the frame (9) through the mounting hole (921) so that the bottom mold (2) faces the side. Place the side plate (12) on the first side mold (32) and insert the connecting screw (71). Gradually place the stator laminations (14) on the connecting screw (71). When the stator laminations (14) are stacked to a certain thickness, place the slot bar (8). Then continue to place the remaining stator laminations (14) and side plates (12). S3. Adjust the installation angle of the frame (9) through the mounting hole (921) so that the bottom mold (2) faces upward. Install the second side mold (33) onto the bottom mold (2). Then install the pressure block (41) onto the first side mold (32) and the second side mold (33). Observe the degree of contact between the tooth surface of the stator core (1) and the first flat pressing surface (21) through the observation hole (23). Adjust the vertical pressure of the pressure block (41) through the threaded fastener (6) so that the tooth surface of the stator core (1) is completely in contact with the first flat pressing surface (21). S4. Lock the first side mold (32) and the second side mold (33) by locking assembly (34) so ​​that the second flat pressing surface (31) abuts against the outer side of the corresponding side plate (12); S5. The second locking nut (72) secures the connecting screw (71), and positions and welds the end plate (13) and reinforcing rib (122).

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