Fisheye terminal, external subdivision drive board installation structure and stepping motor thereof

Abstract

The utility model discloses a fisheye terminal, external subdivision drive board installation structure and stepping motor, including the plug-in part, elastic part and head part that connect in order, the center of elastic part has the fisheye hole, the both ends of fisheye hole are formed by the connection of inclined plane of 15 degree to 20 degree. The two sides of the elastic part are provided with protrusions which are in interference fit with a plug-in port of the driving board. The thickness of a fisheye terminal entity located between the protrusions and the head part is larger than that of an entity located between the protrusions and the plug-in part. And the ratio of the length of the head part to the total length of the fisheye terminal is 1 / 4-1 / 3. The novel fisheye terminal reduces stress concentration at the two ends of the fisheye hole, avoids brittle failure of the fisheye terminal, guarantees elastic force through arrangement of the protrusions on the two sides, increases the length of the head part of the novel fisheye terminal, and improves the reliability of the terminal through reasonable design of the length of the head part and the thickness of an entity between the head part and the elastic part. And the overall strength of the fisheye terminal is controlled and ensured while electric connection between long-distance conductors is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of motor design, in particular to a fish-eye terminal, an installation structure of an external micro-stepping drive board and a stepping motor. Background Art

[0002] The fish-eye terminal is used to realize the electrical connection between the stator coil and the drive board by means of interference fit with the drive board, thus eliminating the welding process. The center of the fish-eye terminal has a fish-eye hole. Through the compression deformation of the fish-eye hole, the elastic deformation of the fish-eye terminal is realized. In conventional fish-eye terminals, the fish-eye hole is mainly oval or oval-shaped with large arc dimensions at both ends. When the middle part of the fish-eye hole is compressed and deformed, due to the large opening angle at both ends, it will be subjected to great stress and is prone to brittle fracture and failure.

[0003] In addition, the drive board in the prior art is often installed inside the motor and is relatively close to the stator coil. Therefore, the connection length between the connection head of the fish-eye terminal and the intermediate interference fit part is short, and the structural strength requirement is not high. Therefore, in the previous design of fish-eye terminals, no strength optimization design has been carried out for it, and it is not suitable for the connection between components at a long distance.

[0004] For the installation design of the drive board, when the micro-stepping circuit is integrated on the drive board, the thickness dimension of the drive board will increase to a certain extent. The installation space inside the motor is relatively compact, the installation difficulty is large, and the heat dissipation amount will also increase, which is not conducive to the rapid heat dissipation of the drive board. Summary of the Utility Model

[0005] The utility model provides a fish-eye terminal with high structural strength, suitable for the connection between components at a long distance and capable of avoiding brittle fracture and failure.

[0006] The utility model provides an installation structure of an external micro-stepping drive board, which installs the drive board inside the wire outlet box and is electrically connected to the improved fish-eye terminal, reducing the installation difficulty of the drive board and improving the heat dissipation efficiency of the drive board.

[0007] The utility model provides a stepping motor, which improves the heat dissipation efficiency and the service life of the motor through the external installation of the drive board.

[0008] The utility model provides a fish-eye terminal, which includes a plugging part, an elastic part and a head connected in sequence. The center of the elastic part has a fish-eye hole. The fish-eye hole is wider in the middle than at both ends along the length direction of the fish-eye terminal, and both ends of the fish-eye hole are connected by inclined surfaces with an included angle of 15° to 20°.

[0009] On both sides of the elastic part, there are protrusions that are in interference fit with the insertion interfaces of the driving plate. The lateral distance between the outer side of the fish-eye terminal and the inner side wall of the fish-eye hole on the same side is the solid thickness of the fish-eye terminal. Then, the solid thickness of the fish-eye terminal between the protrusion and the head is greater than the solid thickness between the protrusion and the insertion part; and the ratio of the length of the head to the total length of the fish-eye terminal is 1 / 4 to 1 / 3.

[0010] Furthermore, the fish-eye terminal has a plane-symmetrical structure that is symmetrical with respect to the longitudinal central plane.

[0011] Furthermore, the fish-eye hole on one side of the longitudinal central plane has a compression surface, a first inclined surface and a second inclined surface at both ends of the compression surface. The compression surface, the first inclined surface and the second inclined surface are all planes. The distance between the two symmetrically arranged compression surfaces is greater than the distance between the two first inclined surfaces and the distance between the two second inclined surfaces.

[0012] Furthermore, the two symmetric side surfaces of the insertion part have pre-insertion surfaces connected to the elastic part. The pre-insertion surfaces are parallel to the longitudinal central plane, and the ratio of the distance between the two pre-insertion surfaces to the size of the insertion interface is 0.95 to 0.97.

[0013] Furthermore, the elastic part successively includes a first transition section, a crimping section and a second transition section from the insertion part to the head. The outer side surfaces of the first transition section, the crimping section and the second transition section are all planes. The protrusion is located outside the crimping section, and the protrusion is connected to the first transition section through an arc surface.

[0014] Furthermore, the first transition section and the first inclined surface, the crimping section and the compression surface, and the second transition section and the second inclined surface are successively located in the same longitudinal length area.

[0015] The present utility model also proposes an external micro-stepping drive board installation structure, which includes a drive board, an outlet box and the above-mentioned fish-eye terminal. The drive board is placed in the outlet box. The outlet box has an insertion hole for the fish-eye terminal to pass through. The head of the fish-eye terminal is connected to the stator assembly, and the elastic part passes through the insertion hole and is in interference fit with the drive board.

[0016] Furthermore, the outlet box includes a box body that can be clamped on the housing of the stepping motor and a box cover that covers the top of the box body; an installation groove is provided at the top of the box body, a cushion plate is provided in the installation groove, the insertion hole penetrates through the cushion plate, the drive board is placed on the cushion plate, and the cushion plate, the drive board and the inner bottom surface of the installation groove enclose a wiring area, and the wiring area is located at the front side of the installation groove.

[0017] After the box cover and the box body are assembled, a lower wire outlet communicating with the wiring area is provided in front of the wire outlet box, and an upper wire outlet communicating with the installation groove is provided at the top of the wire outlet box. The upper wire outlet is located above the backing plate, and the upper wire outlet, the installation groove and the lower wire outlet can form a heat dissipation channel and a foreign object discharge channel.

[0018] Furthermore, convex ribs are provided on both left and right sides of the box cover, sliding grooves that are slidably matched with the convex ribs are provided on both sides of the installation groove, and a slot for inserting the convex ribs is provided on the top surface of the box body located in the middle of the sliding groove; a buckle is provided at the rear end of the box cover, and a bayonet that is buckled with the buckle is provided on the box body located behind the installation groove.

[0019] The present utility model also provides a stepping motor, which includes the external micro-stepping drive board mounting structure described above.

[0020] The beneficial effects of the present utility model are as follows:

[0021] (1) Through the optimized design of the fish-eye holes, the fish-eye terminals of the present utility model reduce the stress concentration at both ends of the fish-eye holes, avoid brittle fracture of the fish-eye terminals, and at the same time ensure the elastic force through the setting of the protrusions on both sides. The head length of the new fish-eye terminals is increased, and through the reasonable design of the head length and the solid thickness between the head and the elastic part, while realizing the electrical connection between long-distance conductors, the overall strength of the fish-eye terminals is ensured.

[0022] (2) The inner wall of the fish-eye holes and the outer side wall of the fish-eye terminals of the present utility model are both formed by the connection of flat surfaces. Compared with the arc surface, the processing technology is simpler, the dimensional accuracy of each part of the fish-eye terminals is high, and it is easier to control the solid thickness of the fish-eye terminals.

[0023] (3) The present utility model arranges the drive board in the wire outlet box, and cooperates with the fish-eye terminals of the new structure to connect the drive board and the stator assembly inside the motor, thereby saving the internal space of the motor, contributing to the rapid heat dissipation of the drive board, and avoiding the failure of the motor caused by excessive temperature inside the motor. Description of the Drawings

[0024] The following further describes the present utility model in conjunction with the drawings and embodiments.

[0025] Figure 1 is a perspective view of the fish-eye terminal of the present utility model;

[0026] Figure 2 is a top view of the fish-eye terminal of the present utility model;

[0027] Figure 3 is a schematic diagram of the external micro-stepping drive board mounting structure of the present utility model;

[0028] Figure 4 is a perspective view of the wire outlet box in the external micro-stepping drive board mounting structure of the present utility model;

[0029] Figure 5 is the perspective view of the box body in the present utility model;

[0030] Figure 6 is the front view of the box body in the present utility model;

[0031] Figure 7 is the perspective view of the box cover in the present utility model.

[0032] In the figure, 1. fish-eye terminal, 2. insertion part, 201. pre-insertion surface, 3. elastic part, 301. first transition section, 302. crimping section, 303. second transition section, 304. protrusion, 305. arc surface, 4. head, 5. driving plate, 501. insertion opening, 6. wire outlet box, 7. fish-eye hole, 701. compression surface, 702. first inclined surface, 703. second inclined surface, 8. insertion hole, 9. box body, 10. box cover, 11. installation groove, 12. backing plate, 13. wiring area, 14. lower wire outlet, 15. upper wire outlet, 16. rib, 17. sliding groove, 18. buckle, 19. bayonet, 1901. insertion port, 1902. buckling port, 20. baffle, 21. retaining platform, 22. relief groove, 23. retaining block, 24. slot. Detailed implementation manners

[0033] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0034] Embodiment 1

[0035] As Figures 1-3 shown, a fish-eye terminal includes an insertion part 2, an elastic part 3 and a head 4 connected in sequence. The elastic part 3 has a fish-eye hole 7 in the center. The insertion part 2 is used to be inserted into the electrode hole of the driving plate 5. The elastic part 3 is used for interference fit with the insertion opening 501 of the driving plate 5. The head 4 is used to be connected with the enameled wire of the stator assembly to realize the electrical connection between the stator assembly and the driving plate 5. The fish-eye hole 7 is wider in the middle than at both ends along the length direction of the fish-eye terminal 1, and both ends of the fish-eye hole 7 are connected by inclined surfaces with an included angle of 15° - 20° (i.e., Figure 2 the included angle a in). Compared with the traditional oval or oval-shaped fish-eye hole 7, the fish-eye hole 7 of the present utility model reduces the included angle of the symmetric side surfaces at both ends. When the middle part of the fish-eye hole 7 is compressed, both ends can be instantaneously closed, reducing the concentrated stress on the inner side surfaces at both ends of the fish-eye hole 7 and avoiding cracking at the end joints, resulting in elastic failure.

[0036] In order to ensure the elastic force of the fish-eye terminal 1, protrusions 304 that are in interference fit with the insertion openings 501 of the driving plate 5 are provided on both sides of the elastic portion 3. The lateral distance between the outer side surface of the fish-eye terminal 1 and the inner side wall of the fish-eye hole 7 on the same side is defined as the solid thickness of the fish-eye terminal 1. Then, the solid thickness of the fish-eye terminal 1 between the protrusion 304 and the head 4 is greater than the solid thickness between the protrusion 304 and the insertion portion 2. The lateral distance refers to the distance in the direction perpendicular to the length direction of the fish-eye terminal 1. Figure 2 The distance b in Figure 2 is the solid thickness of a certain cross-section of the elastic portion 3 of the fish-eye terminal 1; the ratio of the length of the head 4 to the total length of the fish-eye terminal 1 is 1 / 4 to 1 / 3. Compared with the traditional fish-eye terminal 1, the fish-eye terminal 1 of the present invention lengthens the length of the head 4, is suitable for the external installation of the driving plate 5, meets the long-distance electrical connection between the driving plate 5 and the stator assembly, and at the same time ensures the structural strength near the head 4 of the fish-eye terminal 1 by increasing the solid thickness of the fish-eye terminal 1 between the protrusion 304 and the head 4, reducing the fracture risk caused by the increase in the length of the head 4.

[0037] The fish-eye terminal 1 is preferably a plane-symmetrical structure symmetrical with respect to the longitudinal central plane, where the longitudinal direction refers to the direction extending along the length direction of the fish-eye terminal 1.

[0038] For the design of the fish-eye hole 7, a plane-joining structure that is easy to process and has easy-to-control precision is preferably adopted. The inner side surface of the fish-eye hole 7 is also symmetrical with respect to the longitudinal central plane. Taking the inner side surface of the fish-eye hole 7 on one side of the longitudinal central plane as an example, it includes a compression surface 701 and a first inclined surface 702 and a second inclined surface 703 at both ends of the compression surface 701. The compression surface 701, the first inclined surface 702, and the second inclined surface 703 are all planes. The distance between the two symmetrically arranged compression surfaces 701 is greater than the distance between the two first inclined surfaces 702 and the distance between the two second inclined surfaces 703. The compression surface 701 is located in the middle of the fish-eye hole 7 and corresponds to the elastic portion 3. When the fish-eye terminal 1 is engaged with the insertion opening 501, the two compression surfaces 701 undergo compression deformation. The included angle a formed by the two symmetric first inclined surfaces 702 is 15° to 20°, and the included angle a formed by the two symmetric second inclined surfaces 703 is also 15° to 20°. Compared with the arc surface, it is easier to control the dimensional accuracy of the plane, and chamfer transitions can be used between adjacent planes. There are also small transition chamfers at both ends of the fish-eye terminal 1 in the figure, but compared with the traditional end arc surface, the arc length of this transition chamfer is very small and will not inhibit the shrinkage deformation at both ends of the fish-eye hole 7.

[0039] For the design of the outer contour of the fish-eye terminal 1, the side design of the fish-eye terminal 1 is mainly considered. The front end of the insertion part 2 is the same as that of the conventional fish-eye terminal 1, which is a conical plug. The two symmetrical sides of the insertion part 2 have pre-insertion surfaces 201 connected to the elastic part 3. The pre-insertion surfaces 201 are parallel to the longitudinal central plane, and the ratio of the distance between the two pre-insertion surfaces 201 to the size of the insertion opening 501 is 0.95 - 0.97. The cross-section of the insertion opening 501 is rectangular. The upper and lower end surfaces of the fish-eye terminal 1 are flat and fit with two opposite inner walls of the insertion opening 501. The other two inner walls of the insertion opening 501 are in interference fit with the elastic part 3. Here, the size of the insertion opening 501 refers to the distance between the two side walls in interference fit with the elastic part 3. The pre-insertion surfaces 201 can pre-position the fish-eye terminal 1, and on the premise that the insertion part 2 can smoothly pass through the insertion opening 501, ensure that the insertion part 2 is accurately inserted into the corresponding electrode hole of the driving board 5.

[0040] The elastic part 3 successively includes a first transition section 301, a crimping section 302, and a second transition section 303 from the insertion part 2 to the head 4. The outer sides of the first transition section 301, the crimping section 302, and the second transition section 303 are all flat. The protrusion 304 is located outside the crimping section 302, and the protrusion 304 is connected to the first transition section 301 through an arc surface 305. The first transition section 301 and the second transition section 303 gradually contract into the fish-eye hole 7 as the transition between the elastic part 3 and the insertion part 2 and the head 4. The distance between the two crimping sections 302 is the largest, ensuring the abutting force during interference fit. One end of the protrusion 304 is provided with an arc surface 305, making the protrusion 304 in a fish-scale shape, so that the fish-eye terminal 1 can smoothly enter the insertion opening 501 and avoid jamming.

[0041] Preferably, the first transition section 301 and the first inclined surface 702, the crimping section 302 and the compression surface 701, and the second transition section 303 and the second inclined surface 703 are successively located in the same longitudinal length region. Then the distances between the first transition section 301 and the first inclined surface 702, between the crimping section 302 and the compression surface 701, and between the second transition section 303 and the second inclined surface 703 are the physical thicknesses of each part of the fish-eye terminal 1. Through planar design and unified transition design, the physical thickness of the fish-eye terminal 1 is accurately controlled, thereby ensuring the structural strength of the fish-eye terminal 1 and meeting the use requirements of the fish-eye terminal 1 with a greater length.

[0042] Embodiment 2

[0043] An external micro-stepping drive board installation structure, as Figure 3 shown, includes a drive board 5, an outlet box 6, and the above-mentioned fish-eye terminal 1. The drive board 5 is placed in the outlet box 6. The outlet box 6 has an insertion hole 8 for the fish-eye terminal 1 to pass through. The head 4 of the fish-eye terminal 1 is connected to the stator assembly, and the elastic part 3 passes through the insertion hole 8 and is in interference fit with the drive board 5.

[0044] The traditional drive board 5 is installed inside the motor. In the drive board 5 of the present utility model, a micro-stepping circuit is integrated, increasing the thickness of the drive board 5, making it difficult to install inside the motor and not conducive to heat dissipation. Therefore, the drive board 5 is externally placed in the wire outlet box 6. At this time, the distance between the drive board 5 and the stator assembly increases, and the length and structural strength of the traditional fish-eye terminal 1 cannot meet the electrical connection requirements. Therefore, the fish-eye terminal 1 structure in the present utility model needs to be adopted.

[0045] Regarding the design of the wire outlet box 6, in the present utility model, the term "front" indicating the orientation refers to the movement direction of the box cover 10 when the box cover 10 slides out of the box body 9, "rear" refers to the movement direction of the box cover 10 when the box cover 10 is inserted into the box body 9, "left" refers to the left side of the box body 9 when viewed from the front of the box body 9, "right" refers to the right side of the box body 9 when viewed from the front of the box body 9, "up" refers to the direction radially away from the stepping motor housing, and "down" refers to the direction radially close to the stepping motor housing.

[0046] In the traditional structure, the drive board 5 is assembled inside the motor, located outside the wire outlet box 6, and the wire outlet box 6 covers the drive board 5. The wire outlet box 6 is only used for wire routing.

[0047] As Figures 4-7 shown, the wire outlet box 6 of this embodiment includes a box body 9 that can be clamped on the housing of the stepping motor and a box cover 10 that covers the top of the box body 9; an installation groove 11 is provided at the top of the box body 9, a backing plate 12 is provided in the installation groove 11, the insertion hole 8 penetrates through the backing plate 12, the drive board 5 is placed on the backing plate 12, and a wiring area 13 is formed by the backing plate 12, the drive board 5 and the inner bottom surface of the installation groove 11. The wiring area 13 is located at the front side of the installation groove 11.

[0048] When the box cover 10 and the box body 9 are assembled, a lower wire outlet 14 communicating with the wiring area 13 is provided in the front of the wire outlet box 6, and an upper wire outlet 15 communicating with the installation groove 11 is provided at the top of the wire outlet box 6. The upper wire outlet 15 is located above the backing plate 12. The upper wire outlet 15, the installation groove 11 and the lower wire outlet 14 can form a heat dissipation channel and a foreign object discharge channel.

[0049] The area of the backing plate 12 is smaller than the area of the installation groove 11. The backing plate 12 is used to lift the drive board 5 by a certain height, so that a wiring area 13 is left in the area where the backing plate 12 is not provided below the drive board 5 for wire routing. This not only meets the installation requirements of the drive board 5 but also meets the wire routing requirements. Since the drive board 5 is transferred from the outside of the box body 9 to the inside of the box body 9, the box body 9 needs to be provided with an insertion hole 8 for the terminal to pass through, so that the terminal can enter the installation groove 11 to be electrically connected to the drive board 5. The backing plate 12 is integrally formed inside the box body 9, the backing plate 12 protrudes from the inner bottom surface of the box body 9, and the insertion hole 8 is located on the box body 9 in the area where the backing plate 12 is located. Therefore, the insertion hole 8 penetrates through the backing plate 12.

[0050] The wire outlet box 6 of the present utility model is provided with two wire outlets, and both wire outlets can allow wires to pass through. Among them, the lower wire outlet 14 is closer to the wiring area 13 and can be used as the main wire outlet. The wires arranged in the wiring area 13 can be directly led out from the lower wire outlet 14. At the same time, since the driving board 5 is a driving board 5 with a subdivision integrated circuit and has a large heat dissipation, the setting of the upper and lower wire outlets can increase the air circulation, so that the installation groove 11 is in circular communication with the external air, thereby improving the heat dissipation efficiency.

[0051] In the assembly stage, the welding of the external driving board 5 can be transferred to an anti-static workshop to avoid foreign object adsorption. After external foreign objects enter the installation groove 11 from the upper wire outlet 15, they can also be discharged from the lower wire outlet 14 together with the solder balls of the driving board 5, effectively preventing foreign objects, solder balls, etc. from entering the motor and causing quality problems.

[0052] The upper wire outlet 15 is preferably located at the rear end of the box cover 10, so that the upper wire outlet 15 and the lower wire outlet 14 are distributed at the front and rear ends of the installation groove 11, which helps to comprehensively dissipate heat inside the installation groove 11.

[0053] The box cover 10 and the box body 9 usually adopt a plug-in structure, that is, they are buckled after being inserted. The specific structure is as follows: the left and right sides of the box cover 10 have convex ribs 16, and both sides of the installation groove 11 have sliding grooves 17 that are slidably matched with the convex ribs 16; the rear end of the box cover 10 is provided with a buckle 18, and the box body 9 located behind the installation groove 11 has a bayonet 19 that is buckled with the buckle 18. During installation, first insert the convex ribs 16 of the box cover 10 into the sliding grooves 17, and then push the box cover 10 backward until the buckle 18 reaches the rear of the box body 9 and is buckled with the bayonet 19. The buckle 18 preferably has two symmetrically arranged on both sides of the upper wire outlet 15 to ensure balanced force.

[0054] To facilitate the installation of the circuit board and the flexible cable, the front end of the installation groove 11 is open, the front end of the box cover 10 has a baffle 20 that blocks the installation groove 11, and the lower wire outlet 14 is located at the lower part of the baffle 20. When the box cover 10 is not installed, the open space at the front end of the installation groove 11 is relatively large, which is convenient for front-end wiring and welding of the circuit board. The width and height of the lower wire outlet 14 are both smaller than the corresponding dimensions of the installation groove 11, and the baffle 20 is used to block the space in front of the installation groove 11 except for the lower wire outlet 14.

[0055] The lower wire outlet 14 can be only located on the baffle 20 of the box cover 10, or can be located on both the box cover 10 and the box body 9 at the same time, such as Figure 5As shown in the figure, for the convenience of the wire to extend from the lower wire outlet 14, the lower surface of the lower wire outlet 14 is at the same height as the inner bottom surface of the wiring area 13. The front ends of the box body 9 on both sides of the lower wire outlet 14 have a retaining platform 21 that protrudes from the inner bottom surface of the installation groove 11 and is in contact and cooperation with the lower surface of the baffle 20. The design of the retaining platform 21 can block the wire, so that the wire only extends from the lower wire outlet 14.

[0056] The bayonet 19 includes an insertion port 1901 extending backward from the rear end surface of the installation groove 11 and a buckling port 1902 extending downward from the top surface of the box body 9. The insertion port 1901 is communicated with the buckling port 1902, and the buckle 18 is stuck on the inner surface of the buckling port 1902 through the insertion port 1901. As Figure 5 and Figure 6 shown, the insertion port 1901 and the buckling port 1902 are a horizontal hole and a vertical hole respectively, and the two meet inside the box body 9. The buckling part of the buckle 18 faces upward. When the buckle 18 is inserted into the insertion port 1901 and reaches the buckling port 1902, the buckling part of the buckle 18 enters the buckling port 1902 and abuts against the inner surface of the buckling port 1902. At this time, the rear end surface of the box cover 10 abuts against and limits the rear end surface of the box body 9 inside the installation groove 11. Preferably, a chamfer is provided on the side of the buckle 18 that cooperates with the buckling port 1902, which is convenient for pushing the buckle 18 into the insertion port 1901 and is more labor-saving when inserting. The design of the bayonet 19 of the present utility model can hide the buckle 18 inside the bayonet 19. After the wire outlet box 6 is assembled, the surface has no sharp parts and is relatively smooth, and there is no need to open a groove inside, only straight holes need to be processed, and the processing technology is simple.

[0057] Since the box cover 10 needs to be inserted from the front of the box body 9, when the box cover 10 moves backward, a vacant position appears in front of the sliding groove 17. If it is not blocked, foreign matters will accumulate in the sliding groove 17 or even enter the installation groove 11. Therefore, preferably, there are relief grooves 22 on both sides of the front end of the installation groove 11. The relief grooves 22 are located at the front end of the sliding groove 17 and are connected to the sliding groove 17 to form an L-shaped structure. The left and right sides of the box cover 10 have retaining blocks 23 connected to the baffle 20. When the box body 9 and the box cover 10 are buckled, the retaining blocks 23 are located in the relief grooves 22, so that the retaining blocks 23 are in contact with the inner side surface of the installation groove 11. The retaining blocks 23 can not only block the front end of the sliding groove 17, but also play a role in limiting the sliding of the box cover 10.

[0058] Embodiment III

[0059] On the basis of Embodiment II, as Figure 4 、 Figure 5 and Figure 7As shown in the figure, the top surface of the box body 9 located in the middle of the sliding groove 17 has a slot 24 for the convex rib 16 to be inserted. When the convex rib 16 slides backward along the sliding groove 17 by a certain distance, the buckle 18 engages with the bayonet 19. The setting of the slot 24 enables the convex rib 16 to be directly inserted backward from the middle of the sliding groove 17 without having to move from the front end of the sliding groove 17 to the rear end. The sliding distance is small, which speeds up the assembly efficiency and can also prevent friction between the box cover 10 and the circuit board during the assembly process.

[0060] Embodiment 4

[0061] A stepping motor includes the external microstepping drive board mounting structure described above.

[0062] The stepping motor of the present utility model improves the built-in mounting of the drive board 5 to an external mounting, which can transfer the soldering work of the drive board 5 to an anti-static workshop. It is safe and reliable, and the solder balls and foreign objects generated during the soldering process can easily be discharged from the lower wire outlet 14 and will not enter the motor interior to cause poor motor quality.

[0063] The stepping motor of the present utility model can be applied to the field of servo motor drive and control integration systems.

[0064] In addition, terms such as "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0065] In this specification, the schematic descriptions of the terms do not necessarily refer to the same embodiments. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments.

[0066] Taking the above ideal embodiments of the present utility model as an inspiration, through the above description, relevant workers can make various changes and modifications completely within the scope without departing from the technical idea of this utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A fisheye terminal, characterized in that: It comprises a plug-in portion (2), an elastic portion (3) and a head portion (4) connected in sequence, wherein the elastic portion (3) has a fisheye hole (7) at its center, wherein the fisheye hole (7) has a width in the middle greater than that at both ends along the length direction of the fisheye terminal (1), and both ends of the fisheye hole (7) are connected by inclined planes with an angle of 15° to 20°; The elastic portion (3) is provided with protrusions (304) on both sides thereof which are interference-fitted with the plug interface (501) of the driving plate (5), so that the lateral distance between the outer side surface of the fisheye terminal (1) and the inner side wall of the fisheye hole (7) located on the same side is equal to the solid thickness of the fisheye terminal (1), and the solid thickness of the fisheye terminal (1) located between the protrusion (304) and the head (4) is greater than the solid thickness located between the protrusion (304) and the plug-in portion (2); and the ratio of the length of the head (4) to the total length of the fisheye terminal (1) is 1 / 4 to 1 / 3.

2. The fisheye terminal according to claim 1, characterized in that: The fisheye terminal (1) is a planar symmetrical structure that is symmetrical relative to a longitudinal central plane.

3. The fisheye terminal according to claim 2, characterized in that: The fisheye hole (7) located on one side of the longitudinal center plane has a compression surface (701) and a first inclined surface (702) and a second inclined surface (703) located at both ends of the compression surface (701); the compression surface (701), the first inclined surface (702) and the second inclined surface (703) are all planes; and the distance between two symmetrically arranged compression surfaces (701) is greater than the distance between the two first inclined surfaces (702) and the distance between the two second inclined surfaces (703).

4. The fisheye terminal according to claim 2, characterized in that: The two symmetrical side surfaces of the plug-in portion (2) have pre-insertion surfaces (201) connected to the elastic portion (3), the pre-insertion surfaces (201) are parallel to the longitudinal center plane, and the ratio of the distance between the two pre-insertion surfaces (201) to the size of the plug-in port (501) is 0.95-0.

97.

5. The fisheye terminal according to claim 3, characterized in that: The elastic portion (3) comprises a first transition section (301), a crimping section (302) and a second transition section (303) in sequence from the plug-in portion (2) to the head portion (4); the outer side surfaces of the first transition section (301), the crimping section (302) and the second transition section (303) are all planes; the protrusion (304) is located outside the crimping section (302); and the protrusion (304) is connected to the first transition section (301) via an arc surface (305).

6. The fisheye terminal according to claim 5, characterized in that: The first transition section (301) and the first inclined surface (702), the crimping section (302) and the compression surface (701), and the second transition section (303) and the second inclined surface (703) are located in the same longitudinal length region in sequence.

7. An external subdivision drive board installation structure, characterized in that: It comprises a driving board (5), an outlet box (6) and a fisheye terminal (1) as claimed in any one of claims 1 to 6, wherein the driving board (5) is placed in the outlet box (6), the outlet box (6) has a plug hole (8) for the fisheye terminal (1) to pass through, the head (4) of the fisheye terminal (1) is connected to the stator assembly, and the elastic part (3) passes through the plug hole (8) and is interference fit with the driving board (5).

8. The external subdivision drive plate installation structure according to claim 7, characterized in that: The outlet box (6) comprises a box body (9) that can be clamped on the housing of the stepper motor and a box cover (10) that covers the top of the box body (9); a mounting groove (11) is provided on the top of the box body (9); a pad (12) is provided in the mounting groove (11); the plug hole (8) passes through the pad (12); the drive board (5) is placed on the pad (12); the pad (12), the drive board (5) and the inner bottom surface of the mounting groove (11) form a wiring area (13); the wiring area (13) is located at the front side of the mounting groove (11); When the box cover (10) is assembled with the box body (9), the front of the outlet box (6) is provided with a lower outlet (14) connected to the wiring area (13), and the top of the outlet box (6) is provided with an upper outlet (15) connected to the mounting groove (11), wherein the upper outlet (15) is located above the pad (12), and the upper outlet (15), the mounting groove (11) and the lower outlet (14) can form a heat dissipation channel and a foreign matter removal channel.

9. The external subdivision drive board installation structure according to claim 8, characterized in that: The box cover (10) has convex ribs (16) on both sides, the installation groove (11) has sliding grooves (17) on both sides that are slidably matched with the convex ribs (16), and the top surface of the box body (9) located in the middle of the sliding groove (17) has a slot (24) for inserting the convex rib (16); the rear end of the box cover (10) is provided with a buckle (18), and the box body (9) located behind the installation groove (11) has a buckle (19) that is buckled with the buckle (18).

10. A stepping motor, characterized in that: It includes the external subdivision drive board mounting structure as described in any one of claims 7-9.

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