Bobbin terminals, stator assemblies, permanent magnet stepper motors and electronic equipment

Abstract

The present invention belongs to the technical field of micro permanent magnet stepper motors, and in particular, relates to a bobbin terminal, a stator assembly, a permanent magnet stepper motor and an electronic device. It solves the technical problem that the existing stator terminal terminal is easily damaged. The bobbin terminal includes an outer protrusion connected to the outer wall of the bobbin body; a terminal needle, the inner end of which is embedded in the outer protrusion, and the outer end passes through an end face of the outer protrusion away from the bobbin body; a conductive terminal, which is wrapped around one end of the terminal needle close to the outer protrusion; an outer convex anti-injury structure, which is connected to the outer protrusion and protrudes from an end face of the outer protrusion provided with the terminal needle; the height of the outer convex anti-injury structure from one end face of the outer protrusion to the highest point of the protrusion of the outer convex anti-injury structure is equal to or greater than the axial length of the conductive terminal after being axially compressed into place. The advantage of the present invention is that it can protect the terminal.

Description

Technical Field

[0001] The invention belongs to the technical field of micro permanent magnet stepping motors, and in particular relates to a bobbin terminal, a stator assembly, a permanent magnet stepping motor and electronic equipment. Background Art

[0002] Permanent magnet stepper motor is a type of stepper motor. Its stator is claw-shaped pole teeth formed by sheet metal stamping, and its rotor is permanent magnet. The advantages of permanent magnet stepper motor are simple structure, convenient drive, adjustable speed, high precision, low noise, etc.

[0003] Micro stepper motors are widely used in monitoring systems, automatic control, office, communication, scanning and other electronic equipment fields.

[0004] The original winding tube terminal has a flat end face of the terminal pin. After the enameled copper wire is wound on the winding tube, it is necessary to wind the two ends of the enameled copper wire onto the terminal pin, that is, to form a cylindrical electrical connection terminal. At this time, the cylindrical electrical connection terminal has a gap between the wires during winding, and the gap needs to be eliminated. The conventional process is to use an auxiliary fixture to protect the cylindrical electrical connection terminal when the gap is eliminated. The defect of this process is that although it can solve the limit limit protection when the gap is eliminated, the limit protection on this fixture is frequently used and wears and crushes the above-mentioned plane, which is unreasonable in design.

[0005] Secondly, when the cylindrical electrical terminal and the circuit board are welded and connected, the gravity of the circuit board will cause compressive damage to the cylindrical electrical terminal wrapped around the terminal pin; in addition, during the soldering process of the circuit board, heat will be melted on the above-mentioned plane of the winding tube terminal, affecting the stability of the terminal pin.

[0006] The above-mentioned problems in the prior art increase the difficulty of eliminating the gap between the cylindrical electrical terminals and soldering the circuit board, thereby increasing the processing cost and the defect rate. Summary of the invention

[0007] The purpose of the present invention is to provide a bobbin terminal, a stator assembly, a permanent magnet stepper motor and an electronic device that can solve the above technical problems.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] The conduit terminal includes:

[0010] An external raised platform connected to the outer wall of the winding tube body;

[0011] The terminal pin has an inner end embedded in the outer protrusion and an outer end extending out from an end surface of the outer protrusion away from the winding tube body;

[0012] A conductive terminal is wrapped around one end of the terminal pin close to the outer raised platform;

[0013] An external convex injury prevention structure is connected to the external convex platform and protrudes from an end surface of the external convex platform provided with a terminal pin;

[0014] The protrusion height of the external convex injury-preventing structure from one end surface of the external convex platform to the highest point of the protrusion of the external convex injury-preventing structure is equal to or greater than the axial length of the conductive terminal after being axially compressed into place.

[0015] In the above-mentioned winding tube terminal, the external convex anti-injury structure includes at least one external convex anti-injury boss arranged on one end face of the external convex boss, and the protrusion height of the external convex anti-injury boss is equal to or greater than the axial length of the conductive terminal after being axially compressed into place.

[0016] In the above-mentioned winding tube terminal, the outer convex anti-injury boss has an arc-shaped convex surface, and the protrusion height from the arc top of the arc-shaped convex surface to one end surface of the outer protrusion boss is equal to or greater than the axial length of the conductive terminal after being axially compressed into place.

[0017] In the above-mentioned winding tube terminal, the external convex anti-injury boss and the external raised platform are integrally injection-molded.

[0018] In the above-mentioned winding tube terminal, there are four terminal pins which are spaced apart from each other, and an outer convex anti-injury boss located between two adjacent terminal pins is provided on one end surface of the outer convex boss.

[0019] In the above-mentioned winding tube terminal, the externally protruding anti-injury boss is in any one of a strip shape and a column shape or a combination of the two.

[0020] As another solution, in the above-mentioned winding tube terminal, the external protruding anti-injury structure includes a plurality of anti-injury protrusions connected to the outer circumferential surface of the external protrusion platform at one end, the other end of the anti-injury protrusion protrudes from an end surface of the external protrusion platform provided with a terminal needle, and the protruding height of the anti-injury protrusion from the external protrusion platform is equal to or greater than the axial length of the conductive terminal after being axially compressed into place.

[0021] In the above-mentioned winding tube terminal, the terminal also includes a circuit board;

[0022] An insertion hole for inserting a terminal pin is provided on the circuit board, the circuit board is placed on the convex anti-injury structure and the terminal pin passes through the insertion hole;

[0023] The conductive terminal is located between the circuit board and one end surface of the outer protrusion, and the vertical distance from the one end surface of the outer protrusion to the circuit board is equal to or greater than the axial length of the conductive terminal after being axially compressed into place;

[0024] The circuit board and the conductive terminal are connected by welding.

[0025] The present invention also provides a stator assembly comprising:

[0026] The winding tube body is cylindrical and is integrally formed by injection molding;

[0027] A bobbin terminal as described above is provided.

[0028] The present invention also provides a permanent magnet stepping motor comprising:

[0029] Having a stator assembly as described above;

[0030] The rotor cooperates with the stator assembly and rotates.

[0031] The present invention also provides an electronic device having the permanent magnet stepping motor as described above.

[0032] Compared with the prior art, the advantages of the present invention are:

[0033] 1. The outer convex anti-injury structure is designed on the outer convex platform. At this time, the outer convex anti-injury structure can protect the conductive terminal when it is axially compressed into place, and support the weight of the circuit board during subsequent welding of the circuit board to prevent the circuit board from pressing the conductive terminal and causing damage. At the same time, during the welding process, the heat will not be directly transferred to the plane of the outer convex platform. Even if a certain amount of hot melt damage occurs, the outer convex anti-injury structure will replace the plane to bear it. The terminal pin is fixed and stable, which can greatly improve the welding quality and the welding efficiency of the winding tube terminal, greatly reduce the production cost, and greatly improve the production qualification rate.

[0034] 2. The outer convex anti-damage structure is designed directly on the outer convex platform to solve the wear problem and the flat surface scratch problem, and further reduce the difficulty of axial compression manufacturing of the conductive terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic structural diagram of the stator assembly provided by the present invention after removing the circuit board.

[0036] Figure 2 yes Figure 1 A in the figure is an enlarged structural diagram.

[0037] Figure 3 yes Figure 1 Schematic diagram of the stereoscopic perspective structure.

[0038] Figure 4 It is a schematic diagram of the structure of the stator assembly provided by the present invention.

[0039] Figure 5 yes Figure 4 Schematic diagram of the stereoscopic perspective structure.

[0040] Figure 6 It is a schematic diagram of the top view structure of the jig pressing plate used in the assembly process provided by the present invention.

[0041] Figure 7 It is a structural schematic diagram of embodiment 5 provided by the present invention.

[0042] Figure 8 It is a structural schematic diagram of embodiment 6 provided by the present invention.

[0043] In the figure, the winding tube body 1, the external protrusion 2, the terminal pin 3, the conductive terminal 4, the external protrusion anti-injury structure 5, the external protrusion anti-injury boss 50, the arc-shaped convex surface 51, the anti-injury boss 52, the circuit board 6, the insertion hole 60, the fixture pressure plate 7, the protrusion height h, and the axial length L. DETAILED DESCRIPTION

[0044] The following are specific embodiments of the invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0045] like Figure 1 , Figure 2 and Figure 4 As shown, the conduit terminal includes:

[0046] The outer protrusion 2 is connected to the outer wall of the winding tube body 1. Preferably, the outer protrusion 2 is connected to the middle of the outer wall of the winding tube body 1, so that the enameled copper wires in the two wire grooves can be pulled and wound toward the middle position;

[0047] Secondly, the outer raised platform 2 of the present embodiment is a flat block structure, and the outer raised platform 2 and the winding tube body 1 are integrally formed by injection molding, which not only improves the structural strength, but also further improves the production efficiency.

[0048] In addition, the end surface of the outer protrusion 2 away from the winding tube body 1 is a plane, which is convenient for processing and manufacturing.

[0049] The terminal pin 3 has an inner end embedded in the outer protruding platform 2, and an outer end passing through an end surface of the outer protruding platform 2 away from the winding tube body 1; the inner end is embedded in the injection molding method, which can improve efficiency.

[0050] The conductive terminal 4 is wound around one end of the terminal pin 3 close to the outer protrusion 2; the winding direction is either clockwise or counterclockwise. The conductive terminal 4 after winding is actually a spiral cylindrical structure. During winding, due to reasons such as the winding equipment, there is a gap between the wires of the conductive terminal 4. In order to prevent the conductive terminal 4 from being compressed and damaged when the gap is compressed and cancelled, and the conductive terminal 4 from being compressed and damaged during subsequent circuit board welding, this embodiment uses the following structure to implement the above problem as follows:

[0051] The external convex injury prevention structure 5 is connected to the external convex platform 2 and protrudes from an end surface of the external convex platform 2 provided with the terminal pin 3;

[0052] The protrusion height h of the external convex injury-preventing structure 5 from one end surface of the external convex platform 2 to the highest protrusion point of the external convex injury-preventing structure 5 is equal to or greater than the axial length L of the conductive terminal 4 after being axially compressed into place.

[0053] like Figure 4-5 As shown, the circuit board 6 is provided with an insertion hole 60 for inserting the terminal pin 3, the circuit board 6 is placed on the convex anti-injury structure 5 and the terminal pin 3 passes through the insertion hole 60;

[0054] The conductive terminal 4 is located between the circuit board 6 and one end surface of the above-mentioned external protrusion 2. The vertical distance from the one end surface of the above-mentioned external protrusion 2 to the circuit board 6 is equal to or greater than the axial length L of the conductive terminal 4 after being axially compressed into place. The external convex anti-injury structure 5 forms a buffer protection space between the circuit board 6 and the above-mentioned plane.

[0055] The circuit board 6 and the conductive terminal 4 are connected by welding.

[0056] The circuit board 6 is, for example, a PCB board.

[0057] This embodiment directly utilizes the outer convex damage prevention structure 5 designed on the outer convex platform 2. At this time, the outer convex damage prevention structure 5 can protect the conductive terminal 4 when it is axially compressed into place, and support the weight of the circuit board during subsequent welding of the circuit board to prevent the circuit board from pressing the conductive terminal 4 and causing damage. At the same time, during the welding process, the heat will not be directly transferred to the plane of the outer convex platform 2. Even if a certain amount of heat-melting damage occurs, the outer convex damage prevention structure 5 will replace the plane to bear it. The terminal pin is fixed and stable, which can greatly improve the welding quality and the welding efficiency of the winding tube terminal, greatly reduce the production cost, and greatly improve the production qualification rate.

[0058] Secondly, the outer convex anti-damage structure 5 is directly designed on the outer convex platform 2, which solves the wear problem and the plane scratch problem, and further reduces the difficulty of manufacturing and processing the conductive terminal 4 under axial compression.

[0059] Specifically, Figure 2-3As shown, the external convex injury prevention structure 5 of this embodiment includes at least one external convex injury prevention boss 50 arranged on one end surface of the external convex platform 2, and the protrusion height h of the external convex injury prevention boss 50 is equal to or greater than the axial length L of the conductive terminal 4 after being axially compressed into place. The number of the external convex injury prevention bosses 50 can be set according to actual manufacturing requirements, for example: the number range is 1-5 external convex injury prevention bosses 50. The external convex platform 2 is in the shape of a long strip, and its external convex injury prevention bosses 50 are distributed along the width direction of one end surface of the external convex platform 2. The end surfaces of the two ends of the external convex injury prevention boss 50 are respectively flush with the two side surfaces in the thickness direction of the external convex platform 2, so as to facilitate processing and prevent interference.

[0060] An external convex anti-injury boss 50 is directly designed on one end surface of the external convex platform 2, which reduces the radial direction of the external convex platform 2 and the occupied space volume, making the overall structure more compact while also meeting the protection requirements.

[0061] Preferably, the outer convex anti-injury boss 50 has an arcuate convex surface 51, and the protrusion height h between the arc top of the arcuate convex surface 51 and one end surface of the outer protrusion 2 is equal to or greater than the axial length L of the conductive terminal 4 after being axially compressed into place. The arcuate convex surface 51 can facilitate injection molding and reduce the contact surface with the circuit board, thereby protecting the circuit components of the circuit board. Of course, the arcuate convex surface 51 can be replaced by a horizontal plane or other structural planes, and the alternatives are not exhaustive in this embodiment.

[0062] Preferably, the outer convex anti-injury boss 50 and the outer convex platform 2 are integrally injection molded. Integral molding can greatly improve the production efficiency and also improve the strength of the connection structure between the two.

[0063] Preferably, the terminal pins 3 of this embodiment have four and are spaced apart, and an external convex anti-injury boss 50 located between two adjacent terminal pins 3 is provided on one end surface of the external convex platform 2. That is, there are three external convex anti-injury bosses 50, forming a spaced protection, which can avoid a single protection resulting in a weaker protection effect on the conductive terminal 4.

[0064] Based on the premise that the enameled copper wire has been wound around the terminal pin to form the conductive terminal 4, the assembly method of this embodiment includes the following steps: Figure 4-6 As shown,

[0065] S1, axial compression, using the jig pressing plate 7 distributed perpendicularly to the terminal pin 3 to axially compress the conductive terminal 4 wrapped around the terminal pin 3, when the jig pressing plate 7 contacts the outer convex anti-injury structure 5 on the outer convex platform 2, the conductive terminal 4 is axially compressed into place, and the jig pressing plate 7 is separated from the terminal pin 3 and reset;

[0066] The jig pressing plate 7 is provided with a matching hole 70 that matches the gap of the terminal pin 3 to facilitate the insertion of the terminal pin 3 , and the hole diameter of the matching hole is equal to or larger than the inner diameter of the conductive terminal 4 .

[0067] S2, welding, align the insertion hole 60 on the circuit board 6 with the terminal pin 3, and then place the circuit board 6 on the external convex anti-injury structure 5, leave a buffer protection space between the circuit board 6 and the end surface of the external convex platform 2 with the terminal pin 3, and use welding to weld the circuit board 6 and the conductive terminal 4 together, thus completing the assembly of the winding tube terminal.

[0068] In the above step S1, the terminal pin 3 is in a vertical state; the fixture pressing plate 7 is located above the upper end of the terminal pin 3 and can be raised and lowered in the vertical direction.

[0069] Embodiment 2

[0070] The structure and principle of this embodiment are basically the same as those of the first embodiment, and the difference lies in that the external convex anti-injury boss 50 is columnar and is directly arranged on one end surface of the above-mentioned external convex platform 2.

[0071] Of course, it can also be a columnar external convex anti-injury boss and a strip-shaped external convex anti-injury boss set on one end surface of the above-mentioned external convex platform 2. This embodiment does not list all the external convex anti-injury bosses of different shapes.

[0072] Embodiment 3

[0073] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that the external convex anti-injury boss 50 is distributed along the length direction of one end surface of the external convex boss 2. When distributing, it is necessary to avoid the enameled copper wire.

[0074] Embodiment 4

[0075] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: Figure 7 As shown, the external convex anti-injury structure 5 includes a plurality of anti-injury protrusions 52 connected at one end to the outer circumferential surface of the external protrusion 2, the other end of the anti-injury protrusion 52 protrudes from an end surface of the external protrusion 2 provided with a terminal needle 3, and a protrusion height h of the anti-injury protrusion 52 protruding from the external protrusion 2 is equal to or greater than the axial length L of the conductive terminal 4 after being axially compressed into place.

[0076] That is, the anti-injury convex column 52 is designed on the outer circumferential surface, which can also meet the use requirements. Preferably, at least one anti-injury convex column 52 is respectively arranged on the two opposite side surfaces of the outer protrusion 2, and the anti-injury convex columns 52 arranged on the two opposite side surfaces are symmetrically distributed or staggered. The protruding section can form an extreme protection and support gravity, which can also meet the production process requirements.

[0077] Secondly, the end surface of the anti-injury protrusion 52 away from the outer protrusion platform 2 is any one of a horizontal surface and a spherical surface.

[0078] Embodiment 5

[0079] Based on the first to fourth embodiments, Figure 4 As shown, the stator assembly of this embodiment includes a bobbin body 1, which is cylindrical and formed as one piece by injection molding. There are two winding grooves spaced apart on the outside of the bobbin body 1 to facilitate the winding of the enameled copper wire, and the enameled copper wire is wound in the winding grooves.

[0080] It also has the winding tube terminal as described in the first to fourth embodiments.

[0081] Embodiment 6

[0082] Based on the fifth embodiment, Figure 8 As shown, the permanent magnet stepper motor of this embodiment includes a stator assembly as described in Example 5, and a rotor, which cooperates with the stator assembly and rotates. The stator assembly of this embodiment is an external stator, which can be selected according to actual needs, and the rotor is assembled accordingly according to the internal stator or the external stator. The assembly method of the stator and the rotor belongs to the prior art and is not described in detail in this embodiment.

[0083] Embodiment 7

[0084] Based on the sixth embodiment, the electronic device of this embodiment includes the permanent magnet stepping motor as described in the sixth embodiment. For the electronic device, please refer to the background technology section.

[0085] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. Reel terminal, including: An outer protrusion (2) connected to the outer wall of the winding tube body (1); The terminal pin (3) has an inner end embedded in the outer protruding platform (2) and an outer end extending out from an end surface of the outer protruding platform (2) away from the winding tube body (1); A conductive terminal (4) is wound around one end of the terminal pin (3) close to the outer protruding platform (2); The terminal is characterized in that: An externally convex injury prevention structure (5) is connected to the externally convex platform (2) and the externally convex injury prevention structure (5) protrudes from an end surface of the externally convex platform (2) provided with a terminal pin (3); The protrusion height (h) of the external protrusion anti-injury structure (5) from one end surface of the external protrusion platform (2) to the highest protrusion point of the external protrusion anti-injury structure (5) is equal to or greater than the axial length (L) of the conductive terminal (4) after being axially compressed into place.

2. The bobbin terminal according to claim 1, characterized in that: The external convex anti-injury structure (5) comprises at least one external convex anti-injury boss (50) arranged on an end surface of the external convex boss (2), and the convex height (h) of the external convex anti-injury boss (50) is equal to or greater than the axial length (L) of the conductive terminal (4) after being axially compressed into place.

3. The bobbin terminal according to claim 2, characterized in that: The external convex anti-injury boss (50) has an arc-shaped convex surface (51), and the protrusion height (h) between the arc top of the arc-shaped convex surface (51) and an end surface of the external protrusion platform (2) is equal to or greater than the axial length (L) of the conductive terminal (4) after being axially compressed into place.

4. The bobbin terminal according to claim 2 or 3, characterized in that: The external convex anti-injury boss (50) and the external raised platform (2) are integrally injection-molded.

5. The bobbin terminal according to claim 4, characterized in that: There are four terminal needles (3) which are spaced apart from each other. An external convex anti-injury boss (50) located between two adjacent terminal needles (3) is provided on one end surface of the external convex boss (2).

6. The bobbin terminal according to claim 2, characterized in that: The externally convex anti-injury boss (50) is in the shape of a strip or a column, or a combination of the two.

7. The bobbin terminal according to claim 1, characterized in that: The external convex injury prevention structure (5) comprises a plurality of injury prevention convex columns (52) one end of which is connected to the outer circumferential surface of the external convex platform (2), the other end of the injury prevention convex column (52) protrudes from an end surface of the external convex platform (2) provided with a terminal pin (3), and the height (h) of the injury prevention convex column (52) protruding from the external convex platform (2) is equal to or greater than the axial length (L) of the conductive terminal (4) after being axially compressed into place.

8. The bobbin terminal according to claim 1, 2 or 7, characterized in that: The terminal also includes a circuit board (6); An insertion hole (60) for inserting a terminal pin (3) is provided on the circuit board (6), the circuit board (6) is placed on the convex anti-injury structure (5) and the terminal pin (3) passes through the insertion hole (60); The conductive terminal (4) is located between the circuit board (6) and one end surface of the outer protruding platform (2), and the vertical distance from the circuit board (6) to the one end surface of the outer protruding platform (2) is equal to or greater than the axial length (L) of the conductive terminal (4) after being axially compressed into place; The circuit board (6) and the conductive terminal (4) are connected by welding.

9. A stator assembly, characterized in that: This component includes: The winding tube body (1) is cylindrical and is integrally formed by injection molding; A winding tube terminal as claimed in any one of claims 1 to 8.

10. Permanent magnet stepper motor, characterized in that: This motor includes: A stator assembly according to claim 9; The rotor cooperates with the stator assembly and rotates.

11. An electronic device, characterized in that A permanent magnet stepping motor as claimed in claim 10.

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