Outlet box structure and stepping motor using same

Abstract

The utility model discloses a wire outlet box structure and a stepping motor using the same, and the structure comprises a box body which is connected with a plurality of pins; the box body is provided with at least one first inner cavity, one side of the first inner cavity penetrates through the box body to form a first end opening, one end of a contact pin is contained in the first inner cavity, and the first inner cavity is used for being connected with a plug in an inserted mode. The inner convex piece is arranged in the first inner cavity, is arranged at an interval with one end of the pin and is used for being clamped with an elastic sheet on the plug; the plug is aligned with the opening of the first end part and is inserted into the first inner cavity, and the elastic sheet is clamped with the inner convex piece; therefore, the technical problems that the plug-in part is exposed outside, the plug-in part is easy to fall off and break due to external force, and poor contact is caused are solved.

Description

Technical Field

[0001] The utility model relates to the field of intelligent equipment, in particular to an outlet box structure and a stepping motor using the same. Background Art

[0002] A motor is an electromagnetic device that converts or transmits electrical energy according to the law of electromagnetic induction. Its main function is to generate driving torque and serve as a power source for electrical appliances or various machines.

[0003] There are many types of motors, and different types are produced as the customer's application areas and working environments vary;

[0004] Among them, permanent magnet deceleration stepper motors are widely used in occasions that require precise control and positioning. The wiring method of permanent magnet deceleration stepper motors adopts a leadless wiring method. The pins on the permanent magnet deceleration stepper motor are plugged into the external plug to form a wiring conduction effect. However, after the plug and the pin are plugged into the existing technology, there are some shortcomings:

[0005] 1. The plug and pin connection is exposed to the outside, which may cause it to fall off and break due to external force, resulting in poor contact;

[0006] 2. The cross-section of the pin is a circular structure, which makes it easy to slip when it comes into contact with the plug. Moreover, when the pin is welded to the coil assembly on the motor, the contact area is small, the welding is not firm, and poor contact may occur. Utility Model Content

[0007] In view of the above-mentioned deficiencies in the related art, the purpose is to provide an outlet box structure and a stepper motor using the same, so as to solve the technical problems in the related art that the plug-in part is exposed to the outside, easily falls off and breaks due to external force, and causes poor contact.

[0008] The technical solution to achieve the purpose is: an outlet box structure, comprising: a box body connected to a plurality of pins;

[0009] The box body has at least one first inner cavity, one side of the first inner cavity passes through the box body to form a first end opening, the first inner cavity accommodates one end of the pin, and the first inner cavity is used to be plugged with the plug;

[0010] and an inner protrusion, disposed in the first inner cavity, spaced apart from one end of the pin and configured to engage with the elastic piece on the plug;

[0011] The plug is aligned with the first end opening and inserted into the first inner cavity. The elastic sheet is engaged with the inner protrusion, and the plug is plugged into the pin.

[0012] Furthermore: the upper surface of the box body is a horizontal plane, and a first process hole is provided on the horizontal plane, and the first process hole passes through the box body and communicates with the first inner cavity;

[0013] The inner protrusion can be seen from the first process hole toward the first inner cavity.

[0014] Furthermore: the first process hole is a rectangular through hole, and the four corners of the rectangular through hole have rounded corners.

[0015] Furthermore: a second process hole is provided on one end portion of the box body, and the second process hole is communicated with the first inner cavity and faces the inner protrusion.

[0016] Furthermore: two partitions are provided on the box body;

[0017] The partitions are arranged in the first inner cavity at intervals to divide the first inner cavity into three spaces. The spaces are connected, and two of the spaces at the edges serve as first guide grooves.

[0018] Further: the lengths of the partitions are different;

[0019] The height dimensions of the first guide grooves are different;

[0020] A height dimension h1 of one of the first guide grooves is smaller than a height dimension h2 of another of the first guide grooves.

[0021] Furthermore: the lower end surface edge of the first end opening, the partition and the first guide groove are all provided with chamfers.

[0022] Furthermore: two second guide grooves are further provided on the box body, and the second guide grooves are arranged opposite to each other with a spacing therebetween, and are arranged in the first inner cavity and communicated with the first inner cavity.

[0023] Furthermore: the inner protrusion has an inclined surface and an arc surface;

[0024] The arc-shaped surface is provided between the first process hole and the inclined surface, connecting the first process hole and the inclined surface;

[0025] The inclined surface and the arc surface face the first process hole.

[0026] Further: the box body and the plug pin are integrally formed or plugged together;

[0027] The pin is plugged into the plug;

[0028] After the box body is connected to the plug pin, a dimension a1 is formed between the bottom surface of the plug pin and the lower end surface of the first inner cavity;

[0029] A dimension b2 is defined between one end of the pin and the other side of the first inner cavity;

[0030] The plug has a dimension a2, which is the distance between the bottom surface of the plug and the bottom surface of the jack on the plug;

[0031] When the plug is inserted into the first inner cavity, a dimension b3 is defined between the plug and the first end opening, and a dimension b1 is defined between one end of the plug and the other side of the first inner cavity;

[0032] a1 is equal to a2;

[0033] When b3 is equal to 0, b2 is greater than b1.

[0034] Furthermore: the pin has an L-shaped bending structure and a square cross-section, one end of which is arranged in the first inner cavity and plugged into the jack, and the other end passes through the box body and is connected to the coil assembly.

[0035] Furthermore: the cross-sectional size of the pin is 0.3 cm×0.3 cm.

[0036] A stepper motor comprises: a plug, a coil assembly and a shell; the coil assembly is arranged in the shell; and further comprises: an outlet box structure, the outlet box structure is connected to the shell and is connected to the plug and the coil assembly.

[0037] The adoption of the above technical solution has the following beneficial effects: a terminal box structure and a stepping motor using the same, compared with the related art, are provided with a box body; a plurality of pins are connected to the box body; when in use, the plug is aligned with the opening of the first end and inserted into the first inner cavity, the elastic sheet on the plug is engaged with the inner protrusion, the plug and the pin are plugged in, and the connection is relatively convenient. Since the inner protrusion is arranged in the first inner cavity, it will not fall off or break due to external force, and the probability of poor contact is reduced; thereby overcoming the technical problem that the plug-in point is exposed to the outside, easily falls off or breaks due to external force, and poor contact occurs, and achieving the technical effect that the plug-in point is arranged inside, will not fall off or break due to external force, and the probability of poor contact is reduced. The plug-in point is practical and can be applied to the field of servo motor drive and control integrated system. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a partial cross-sectional view of the box body and the pin;

[0039] Figure 2 for Figure 1 One of the three-dimensional structural diagrams;

[0040] Figure 3for Figure 2 A partial enlarged schematic diagram of part B in FIG;

[0041] Figure 4 It is a partial cross-sectional view of the box body;

[0042] Figure 5 for Figure 1 Right view of;

[0043] Figure 6 It is a structural schematic diagram of a second guide groove provided on the box body;

[0044] Figure 7 for Figure 1 A partial enlarged schematic diagram of part A in FIG;

[0045] Figure 8 It is a schematic diagram of the force on the arc surface after the inner protrusion is engaged with the elastic sheet;

[0046] Figure 9 for Figure 1 Add a partial cross-sectional view of the plug;

[0047] Figure 10 for Figure 1 The second schematic diagram of the three-dimensional structure;

[0048] Figure 11 A partial cross-sectional view of the box body and pins connected to the stepper motor;

[0049] Figure 12 for Figure 11 Schematic diagram of the three-dimensional structure;

[0050] In the figure: 10. Box body, 11. First inner cavity, 11-1. First end opening, 12. Inner protrusion, 12-1. Inclined surface, 12-2. Arc surface, 13. First process hole, 13-1. Fillet, 14. Second process hole, 15. Partition, 16. First guide groove, 17. Chamfer, 18. Second guide groove, 20. Pin, 100. Plug, 101. Elastic sheet, 102. Jack, 200. Coil assembly, 201. Needle, 300. Shell, 301. Reserved through groove, 19. Second inner cavity, 19-1. Second end opening, 191. Arc convex edge, 192. Hook-shaped clamp, 193. Oblique protrusion, 194. Staggered space. DETAILED DESCRIPTION

[0051] In order to make the content easier to understand, the following is a further detailed description based on specific embodiments and in conjunction with the accompanying drawings;

[0052] A terminal box structure and a stepper motor using the same solve the technical problems in related technologies where the plug-in portion is exposed to the outside and is easily broken off by external forces, resulting in poor contact. The structure can be manufactured and used, achieving the positive effect of setting the plug-in portion internally, preventing it from breaking off by external forces, and reducing the probability of poor contact. The overall concept is as follows:

[0053] One implementation method:

[0054] like Figure 1 、 Figure 2 、 Figure 9 、 Figure 10 As shown; A terminal box structure and a stepping motor using the same, the terminal box structure comprising: a box body 10, connected to a plurality of pins 20;

[0055] The box body 10 has a first inner cavity 11. One side of the first inner cavity 11 passes through the box body 10 to form a first end opening 11-1. The first inner cavity 11 accommodates one end of the pin 20. The first inner cavity 11 is used to be plugged into the plug 100.

[0056] and an inner protrusion 12, disposed in the first inner cavity 11, spaced apart from one end of the pin 20, for engaging with the elastic piece 101 on the plug 100;

[0057] The plug 100 is aligned with the first end opening 11 - 1 and inserted into the first inner cavity 11 . The elastic piece 101 is engaged with the inner protrusion 12 , and the plug 100 is plugged into the pin 20 .

[0058] Specifically, during implementation, the plug 100 is aligned with the first end opening 11-1 and inserted into the first inner cavity 11. The elastic piece 101 on the plug 100 engages with the inner protrusion 12, and the plug 100 is plugged into the pin 20. The connection is relatively convenient. Since the inner protrusion 12 is set in the first inner cavity 11, it will not fall off or break due to external forces, reducing the probability of poor contact.

[0059] Another embodiment:

[0060] like Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 、 Figure 9 、 Figure 10 As shown; in implementation, the first inner cavity 11 is a substantially rectangular space with a regular shape, which is conducive to processing and manufacturing, and is conducive to smooth insertion with the plug 100;

[0061] Another embodiment:

[0062] like Figure 2 、 Figure 3 、 Figure 7 As shown; during implementation, the upper surface of the box body 10 is a horizontal plane, and a first process hole 13 is provided on the horizontal plane. The first process hole 13 passes through the box body 10 and communicates with the first inner cavity 11;

[0063] The first process hole 13 faces the first inner cavity 11, and the inner protrusion 12 is seen;

[0064] The upper surface of the box body 10 is a horizontal surface, which is relatively beautiful and is conducive to setting the first process hole 13;

[0065] The first process hole 13 is provided, so that the molding quality of the inner protrusion 12 is ensured during the injection molding of the box body 10;

[0066] The first process hole 13 is a rectangular through hole, and the four corners of the rectangular through hole have rounded corners 13-1. The rounded corners 13-1 are provided to facilitate demolding during production without damaging the box body 10.

[0067] A first process hole 13 is provided, through which it is possible to see whether the inner protrusion 12 and the elastic sheet 101 are engaged in place, which provides better flexibility in use;

[0068] Another embodiment:

[0069] like Figure 4 As shown; when implemented, a second process hole 14 is provided on one end portion of the box body 10, and the second process hole 14 is connected to the first inner cavity 11 and faces the inner protrusion 12;

[0070] The second process hole 14 is provided, so that the molding quality of the inner protrusion 12 is ensured during the injection molding of the box body 10;

[0071] Another embodiment:

[0072] like Figure 5 As shown; during implementation, the box body 10 is further provided with two partitions 15;

[0073] The partitions 15 are spaced apart in the first inner cavity 11 to divide the first inner cavity 11 into three spaces. The spaces are connected to each other, and two of the spaces at the edge serve as first guide grooves 16.

[0074] A partition 15 is provided to serve as a limit, and two first guide grooves 16 are formed in the first inner cavity 11. The first guide grooves 16 serve as guides. When the plug 100 is inserted into the first inner cavity 11, the plug 100 will not shake left and right or move up and down, which facilitates the insertion of the plug 100 into the first inner cavity 11 and does not damage or bend the pins 20, thereby reducing the probability of poor contact between the plug 100 and the pins 20 and making operation relatively convenient.

[0075] The partitions 15 have different lengths; the first guide slots 16 have different heights; the height h1 of one first guide slot 16 is smaller than the height h2 of the other first guide slot 16. The control of the dimensions results in different spatial volumes of the two first guide slots 16, which not only provides guidance (anti-mistakenness) and facilitates proper insertion of the plug 100, but also, due to the different spatial volumes of the first guide slots 16, the operator will pay attention to the direction when inserting the plug 100, thus preventing the plug 100 from being inserted upside down.

[0076] The explanation of "foolproofing" is that it is a preventive and corrective behavioral restraint method. It uses restrictive methods to avoid errors, allowing operators to intuitively and accurately complete correct operations without expending attention, experience or professional knowledge. This is common knowledge.

[0077] Another embodiment:

[0078] like Figure 5 As shown; in implementation, the lower end surface edge of the first end opening 11-1, the partition 15 and the first guide groove 16 are provided with a chamfer 17;

[0079] A chamfer 17 is provided to serve as a guide, facilitating alignment of the plug 100 with the first end opening 11-1 and insertion into the first inner cavity 11 without damaging the box body 10, making operation relatively convenient.

[0080] Another embodiment:

[0081] like Figure 6 As shown; in implementation, the box body 10 is further provided with two second guide grooves 18, the second guide grooves 18 are arranged opposite each other at intervals, are provided in the first inner cavity 11, and are communicated with the first inner cavity 11;

[0082] A second guide groove 18 is provided, symmetrically arranged on the box body 10, and has a guiding (anti-fouling) function. When the plug 100 is inserted into the first inner cavity 11, the plug 100 will not shake left and right or move up and down, which is conducive to the insertion of the plug 100 into the first inner cavity 11, and will not damage or bend the pins 20, thereby reducing the probability of poor contact between the plug 100 and the pins 20, and the operation is relatively convenient;

[0083] Another embodiment:

[0084] like Figure 1 、 Figure 4 、 Figure 7 、 Figure 8 As shown; in implementation, the inner protrusion 12 has an inclined surface 12-1 and an arcuate surface 12-2; the arcuate surface 12-2 is provided between the first process hole 13 and the inclined surface 12-1, connecting the first process hole 13 and the inclined surface 12-1; the inclined surface 12-1 and the arcuate surface 12-2 face the first process hole 13;

[0085] A bevel 12-1 is provided. When the elastic piece 101 is inserted, it can slide along the bevel 12-1 toward the arc-shaped surface 12-2. The bevel 12-1 forms a barrier, ensuring the reliability of the engagement with the elastic piece 101 and reducing the chance of falling off.

[0086] The arc surface 12-2 is provided to reduce the force acting on the inner protrusion 12 ( Figure 7 In the direction of the arrow in FIG, the pressure F applied by the plug 100) is applied. When the pressure F acts on the arc surface 12-2, the arc surface 12-2 forms a normal supporting force M. The direction of the supporting force M acts upward, which can play a good role in preventing falling off and breaking. In addition, the arc structure of the arc surface 12-2 is relatively smooth, which is conducive to the insertion of the elastic sheet 101. At the same time, when the elastic sheet 101 needs to be pressed by the first process hole 13, the elastic sheet 101 can also be smoothly disengaged from the inner protrusion 12, making assembly and disassembly relatively convenient.

[0087] Another embodiment:

[0088] like Figure 1 、 Figure 5 、 Figure 9 、 Figure 10 As shown; during implementation, the box body 10 and the pin 20 are integrally formed or plugged in, and assembly is relatively convenient;

[0089] The pin 20 is plugged into the plug 100;

[0090] After the box body 10 is connected to the plug pin 20, a dimension a1 is formed between the bottom surface of the plug pin 20 and the lower end surface of the first inner cavity 11;

[0091] There is a dimension b2 between one end of the pin 20 and the other side of the first inner cavity 11;

[0092] The plug 100 has a dimension a2, which is the distance between the bottom surface of the plug 100 and the bottom surface of the jack 102 on the plug 100;

[0093] When the plug 100 is inserted into the first inner cavity 11, a dimension b3 is defined between the plug 100 and the first end opening 11-1, and a dimension b1 is defined between one end of the plug 100 and the other side of the first inner cavity 11;

[0094] a1 is equal to a2;

[0095] When b3 is equal to 0, b2 is greater than b1;

[0096] The size control enables the pin 20 to be reliably plugged into the plug 100 without damaging or bending the pin 20, thus ensuring the conductive performance and improving the quality.

[0097] Another embodiment:

[0098] like Figure 1 、 Figure 5 、 Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 As shown; in implementation, the pin 20 has an L-shaped bent structure and a square cross-section. One end is disposed in the first inner cavity 11 and plugged into the jack 102, while the other end passes through the box body 10 and is connected to the coil assembly 200. The cross-sectional dimensions of the pin 20 are 0.3 cm × 0.3 cm. This increases the contact area between the pin 20 and the jack 102, ensures conductivity, and improves quality.

[0099] Furthermore, the square pin 20 can also increase the contact area with the needle head 201 on the coil assembly 200, making it easier to connect the two together during soldering, thereby ensuring the conductive performance.

[0100] Another embodiment:

[0101] like Figure 1 、 Figure 2 、 Figure 5 、 Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 As shown; when implemented, the box body 10 also has a second inner cavity 19, one side of the second inner cavity 19 passes through the box body 10 to form a second end opening 19-1, and the second inner cavity 19 is oriented differently from the first inner cavity 11 (as shown in FIG. Figure 9 As shown, the first inner cavity 11 faces right, and the second inner cavity 19 faces downward), and the second inner cavity 19 is used to connect and accommodate a portion of the coil assembly 200;

[0102] The box body 10 also has an arc-shaped convex edge 191 and a hook-shaped clamp 192, and the arc-shaped convex edge 191 and the hook-shaped clamp 192 are connected at intervals at the second end opening 19-1;

[0103] The box body 10 also has two oblique protrusions 193 symmetrically arranged at the second end opening 19 - 1 , and arranged between the arc-shaped convex edge 191 and the hook-shaped clamping head 192 , forming a staggered space 194 between the arc-shaped convex edge 191 and the hook-shaped clamping head 192 ;

[0104] The arc-shaped convex edge 191 is used to surround the coil assembly 200 and protect the coil assembly 200;

[0105] The hook-shaped clamp 192 is used to connect with the coil assembly 200;

[0106] A positioning is formed between the oblique protrusion 193 and the outer wall of the housing 300;

[0107] like Figure 1 、 Figure 2 As shown, the upper end of the box body 10 is provided with a first inner cavity 11 and an inner protrusion 12. The upper end of the box body 10 is a stepped structure. When projected from top to bottom, the outer shape is roughly a rectangular structure. The lower end of the box body 10 has an arc-shaped convex edge 191, a hook-shaped clamp 192 and an oblique protrusion 193.

[0108] like Figure 11 、 Figure 12 As shown, when the box body 10 is assembled, the box body 10 is installed in the reserved groove 301 on the shell 300. Through the staggered space 194 on the box body 10, along the side wall of the shell 300, it is clamped into the reserved groove 301. The arc-shaped convex edge 191 and the hook-shaped clamping head 192 move along the inner wall of the shell 300 and enter the shell 300. The inclined protrusion 193 moves along the outer wall of the shell 300, so that the box body 10 is clamped in the reserved groove 301, which makes assembly relatively convenient.

[0109] About stepper motors:

[0110] See Figure 11 、 Figure 12 A stepper motor, comprising: a plug 100, a coil assembly 200 and a housing 300; the coil assembly 200 is disposed in the housing 300; and further comprising: an outlet box structure, the outlet box structure being connected to the housing 300 and connected to the plug 100 and the coil assembly 200;

[0111] The box body 10 is installed in the reserved through groove 301 on the shell 300 and connected to the coil assembly 200. The plug 100 is engaged with the first inner cavity 11 and the inner protrusion 12 on the box body 10. The plug 100 is plugged into the pin 20. The assembly is relatively convenient and will not fall off or break due to external forces, reducing the probability of poor contact.

[0112] The plug 100, coil assembly 200, and housing 300 are not the inventive features of the present invention. They are merely provided to better describe the present invention and facilitate understanding of the technical solution of the present invention. A person skilled in the art, after reading the disclosed content, will be able to directly and unambiguously understand how to configure them without requiring creative effort or excessive experimentation.

[0113] The working principle is as follows: the plug 100 is aligned with the first end opening 11-1 and inserted into the first inner cavity 11. The elastic piece 101 on the plug 100 engages with the inner protrusion 12, and the plug 100 is plugged into the pin 20. The connection is relatively convenient. Since the inner protrusion 12 is set in the first inner cavity 11, it will not fall off or break due to external forces, reducing the possibility of poor contact.

[0114] In the description, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", etc. indicating directions or positional relationships are based on the positional relationships shown in the drawings and are only used to facilitate or simplify the description, and do not necessarily indicate specific directions. The operating procedures described in the embodiments are not absolute steps for use and may be adjusted accordingly in actual use.

[0115] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meanings understood by persons of ordinary skill in the relevant art. The terms "first," "second," and similar words used in the specification and claims do not denote any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "a" or "an" and similar words do not necessarily indicate a limit on quantity, but rather indicate the presence of at least one, which shall be determined based on the content of the embodiments.

[0116] The above is only a preferred specific implementation method, but the scope of protection is not limited to this. Any technician familiar with this technical field can make equivalent replacements or changes based on the technical solutions and inventive concepts within the disclosed technical scope, which should be covered by the scope of protection.

Claims

1. A terminal box structure, characterized in that: include: The box body (10) is connected to a plurality of pins (20); The box body (10) has at least one first inner cavity (11), one side of the first inner cavity (11) passes through the box body (10) to form a first end opening (11-1), the first inner cavity (11) accommodates one end of the pin (20), and the first inner cavity (11) is used for plugging with the plug (100); and an inner protrusion (12), which is arranged in the first inner cavity (11), spaced apart from one end of the plug pin (20), and is used for engaging with the elastic sheet (101) on the plug (100); The plug (100) is aligned with the first end opening (11-1) and inserted into the first inner cavity (11), the elastic sheet (101) is engaged with the inner protrusion (12), and the plug (100) is plugged into the plug pin (20).

2. The outlet box structure according to claim 1, characterized in that: The upper surface of the box body (10) is a horizontal surface, and a first process hole (13) is provided on the horizontal surface. The first process hole (13) passes through the box body (10) and is in communication with the first inner cavity (11); The first process hole (13) faces the first inner cavity (11), and the inner protrusion (12) can be seen.

3. The outlet box structure according to claim 2, characterized in that: The first process hole (13) is a rectangular through hole, and the four corners of the rectangular through hole have rounded corners (13-1).

4. The outlet box structure according to claim 1, characterized in that: A second process hole (14) is provided on one end portion of the box body (10), and the second process hole (14) is communicated with the first inner cavity (11) and faces the inner protrusion (12).

5. The outlet box structure according to claim 1, characterized in that: Two partitions (15) are also provided on the box body (10); The partitions (15) are arranged at intervals in the first inner cavity (11), dividing the first inner cavity (11) into three spaces, the spaces are connected, and two of the spaces at the edges serve as first guide grooves (16).

6. The outlet box structure according to claim 5, characterized in that: The lengths of the partitions (15) are different; The height dimensions of the first guide grooves (16) are different; A height dimension h1 of one of the first guide grooves (16) is smaller than a height dimension h2 of another of the first guide grooves (16).

7. The outlet box structure according to claim 6, characterized in that: Chamfers (17) are provided on the lower end surface edge of the first end opening (11-1), the partition (15) and the first guide groove (16).

8. The outlet box structure according to claim 1, characterized in that: The box body (10) is further provided with two second guide grooves (18), which are spaced apart from each other and arranged in the first inner cavity (11) and communicated with the first inner cavity (11).

9. The outlet box structure according to claim 2, characterized in that: The inner protrusion (12) has an inclined surface (12-1) and an arcuate surface (12-2); The arc-shaped surface (12-2) is arranged between the first process hole (13) and the inclined surface (12-1), connecting the first process hole (13) and the inclined surface (12-1); The inclined surface (12-1) and the arcuate surface (12-2) face the first process hole (13).

10. The outlet box structure according to claim 1, characterized in that: The box body (10) and the plug pin (20) are integrally formed or plugged together; The pin (20) is plugged into the plug (100); After the box body (10) is connected to the plug pin (20), a dimension a1 is provided between the bottom surface of the plug pin (20) and the lower end surface of the first inner cavity (11); A dimension b2 is defined between one end of the insertion pin (20) and the other side of the first inner cavity (11); The plug (100) has a dimension a2, wherein a2 is the distance between the bottom surface of the plug (100) and the bottom surface of the socket (102) on the plug (100); During the process of inserting the plug (100) into the first inner cavity (11), a dimension b3 is provided between the plug (100) and the first end opening (11-1), and a dimension b1 is provided between one end of the plug (100) and the other side of the first inner cavity (11); a1 is equal to a2; When b3 is equal to 0, b2 is greater than b1.

11. The outlet box structure according to claim 10, characterized in that: The pin (20) has an L-shaped bent structure and a square cross-section. One end is disposed in the first inner cavity (11) and plugged into the jack (102), while the other end passes through the box body (10) and is connected to the coil assembly (200).

12. The outlet box structure according to claim 11, characterized in that: The cross-sectional dimensions of the insertion pin (20) are 0.3 cm×0.3 cm.

13. A stepping motor comprising: A plug (100), a coil assembly (200) and a housing (300); the coil assembly (200) is arranged in the housing (300); and the invention is characterized in that it further comprises: adopting the outlet box structure according to any one of claims 1 to 12, the outlet box structure being connected to the housing (300) and connected to the plug (100) and the coil assembly (200).

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