阅读说明：本技术 永磁步进电机及电子设备 (Permanent magnet stepping motor and electronic equipment ) 是由 柯曾松 于 2021-03-31 设计创作，主要内容包括：本发明涉及一种永磁步进电机及电子设备。它解决了现有定子端子接线端容易损伤的技术问题。本永磁步进电机包括定子,定子呈筒状；外凸起台,连接在定子上；端子针,内端嵌固在外凸起台中,外端从外凸起台远离定子的一端面穿出；导电接线端,缠绕在端子针靠近外凸起台的一端并且导电接线端与定子上的线圈连接；转子,穿于定子中并且转子可相对定子旋转；外凸防伤结构,连接在外凸起台上并且外凸防伤结构凸出于外凸起台设有端子针的一端面；外凸防伤结构从外凸起台的一端面至外凸防伤结构的凸起最高点之间的凸起高度等于或大于导电接线端被轴向压缩到位后的轴向长度。本发明的优点在于：可以对接线端形成保护。(The invention relates to a permanent magnet stepping motor and electronic equipment. It has solved the easy technical problem who damages of current stator terminal wiring end. The permanent magnet stepping motor comprises a stator, wherein the stator is cylindrical; the outer convex platform is connected to the stator; the inner end of the terminal needle is embedded in the outer boss, and the outer end of the terminal needle penetrates out of one end face, far away from the stator, of the outer boss; the conductive wiring terminal is wound at one end of the terminal pin close to the outer raised table and is connected with the coil on the stator; a rotor penetrating the stator and rotatable relative to the stator; the outer convex injury-preventing structure is connected to the outer convex platform and protrudes out of one end face, provided with the terminal needle, of the outer convex platform; the convex height of the convex anti-injury structure from one end surface of the outer convex platform to the convex highest point of the convex anti-injury structure is equal to or larger than the axial length of the conductive terminal after the conductive terminal is axially compressed in place. The invention has the advantages that: protection can be formed for the terminal.)

1. A permanent magnet stepper motor comprising:

a stator (b) having a cylindrical shape;

the outer convex table (2) is connected to the stator (b);

the inner end of the terminal needle (3) is embedded in the outer boss (2), and the outer end of the terminal needle penetrates out of one end face, far away from the stator (b), of the outer boss (2);

the conductive wiring terminal (4) is wound at one end of the terminal pin (3) close to the outer boss (2) and the conductive wiring terminal (4) is connected with the coil (e) on the stator (b);

a rotor (c) inserted into the stator (b) and rotatable relative to the stator (b);

its characterized in that, this motor still includes:

the outer convex injury-preventing structure (5) is connected to the outer convex platform (2), and the outer convex injury-preventing structure (5) protrudes out of one end face, provided with the terminal needle (3), of the outer convex platform (2);

the protrusion height (h) of the outer anti-injury structure (5) from one end face of the outer boss (2) to the highest point of the protrusion of the outer anti-injury structure (5) is equal to or greater than the axial length (L) of the conductive terminal (4) after the conductive terminal is axially compressed in place.

2. A permanent magnet stepping motor according to claim 1, wherein said outer protrusion prevention structure (5) comprises at least one outer protrusion prevention projection (50) provided on an end face of said outer protrusion (2), the protrusion height (h) of said outer protrusion prevention projection (50) being equal to or greater than the axial length (L) of the conductive terminal (4) after axial compression into place.

3. The permanent magnet stepping motor according to claim 2, wherein four terminal pins (3) are arranged at intervals, and an outer convex injury-preventing boss (50) is arranged on one end face of the outer convex table (2) and positioned between two adjacent terminal pins (3).

4. The permanent magnet stepping motor according to claim 2 wherein said outer convex atraumatic boss (50) is in the form of either or a combination of an elongated bar and a cylindrical bar.

5. The permanent magnet stepping motor according to claim 1, wherein the external protrusion damage prevention structure (5) comprises a plurality of damage prevention protruding columns (52) with one ends connected to the outer circumferential surface of the external protruding platform (2), the other ends of the damage prevention protruding columns (52) protrude from an end surface of the external protruding platform (2) provided with the terminal pins (3), and a protruding height (h) of the damage prevention protruding columns (52) protruding from the external protruding platform (2) is equal to or greater than the axial length (L) of the conductive terminal (4) after being axially compressed in place.

6. A permanent magnet stepping motor according to claim 1, wherein the motor further comprises a circuit board (6);

an insertion hole (60) for inserting the terminal pin (3) is formed in the circuit board (6), the circuit board (6) is placed on the outer anti-injury structure (5), and the terminal pin (3) penetrates through the insertion hole (60);

the conductive terminal (4) is located between the circuit board (6) and an end surface of the outer ledge (2), and a vertical distance between the circuit board (6) and the circuit board (6) from the end surface of the outer ledge (2) is equal to or greater than an axial length (L) of the conductive terminal (4) after the conductive terminal is axially compressed into place.

7. The permanent magnet stepping motor according to claim 1, wherein the rotor (c) is fixed on an output shaft (d), the output shaft (d) is rotatably connected with the stator (b), and a worm and gear output mechanism is connected to the output end of the output shaft (d).

8. The permanent magnet stepper motor of claim 7, wherein the worm gear output mechanism comprises:

one end of the worm (10) is connected with the output end of the output shaft (d);

the worm wheel (9) is meshed and connected with the worm (10);

the end face of one end of the stator (b) is fixed on the support (11), the worm (10) is rotatably connected with the support (11), and the worm wheel (9) is rotatably connected with the support (11).

9. The permanent magnet stepper motor according to claim 8, wherein the bracket (11) comprises a left end plate (113), a right end plate (111), and a side plate (112) connecting the left end plate (113) and the right end plate (111);

the left end plate (113) is opposite to the right end plate (111), and two ends of the worm (10) are respectively in rotating connection with the left end plate (113) and the right end plate (111);

the worm wheel (9) is rotationally connected with the side plate (112).

10. The permanent magnet stepping motor according to claim 9, wherein an end surface of the stator (b) near the worm (10) is fixed to the left end plate (113) or the right end plate (111).

11. A permanent magnet stepping motor according to claim 9, wherein said worm gear (9) is mounted between a left end plate (113) and a right end plate (111) of the bracket.

12. The permanent magnet stepping motor according to claim 9, wherein a protruding extension plate (13) is provided on one side of the side plate (112), and the worm wheel (9) is rotatably mounted on the protruding extension plate (13).

13. Electronic equipment, characterized in that it has a permanent magnet stepping motor according to any of claims 1-12.

Technical Field

The invention belongs to the technical field of miniature permanent magnet stepping motors, and particularly relates to a permanent magnet stepping motor and electronic equipment.

Background

The miniature permanent magnet type stepping motor is one of stepping motors, a stator is claw-shaped pole teeth formed by stamping and forming metal plates, and a rotor is permanent magnet steel. The miniature permanent magnet stepping motor has the advantages of simple structure, convenience in driving, adjustable rotating speed, higher precision, low noise and the like.

The miniature permanent magnet stepping motor is widely applied to the fields of monitoring systems, electronic equipment such as automatic control, office, communication and scanning fields and the like; for example, the monitoring system may employ optical components, such as lenses, etc., for image capture, and the optical components may be configured with micro stepper motors for controlling the driving of the optical components, etc.

An end face of an original miniature permanent magnet stepping motor with a terminal needle at a winding pipe terminal is a plane, when an enameled copper wire is wound on a winding pipe, the two ends of the enameled copper wire need to be wound on the terminal needle, namely, a cylindrical electric connection terminal is formed, and the cylindrical electric connection terminal at the moment needs to be eliminated due to the fact that a gap exists between the wire and the wire when the wire is wound. The conventional process is to utilize an auxiliary jig to protect when the clearance of the cylindrical electric connection terminal is eliminated in place, and the process has the defects that: although the limit limiting protection can be achieved when the gap is eliminated, the limit protection on the jig is frequently used, worn and crushed on the plane, and the design is unreasonable.

Secondly, when the cylindrical electric connection terminal is in welding connection with the circuit board, the cylindrical electric connection terminal can generate compression damage to the cylindrical electric connection terminal wound on the terminal pin under the gravity of the circuit board; in addition, during the soldering process of the circuit board, the coil terminal is hot-melted on the plane, which affects the stability of the terminal pin.

The problems of the prior art increase the difficulty in eliminating the gap between the cylindrical electric connection terminals and welding the circuit board, and increase the processing cost and the reject ratio.

Disclosure of Invention

The present invention is directed to solve the above problems, and an object of the present invention is to provide a permanent magnet stepping motor and an electronic device that can solve the above problems.

In order to achieve the purpose, the invention adopts the following technical scheme:

this permanent magnetism step motor includes:

the stator is cylindrical;

the outer convex platform is connected to the stator;

the inner end of the terminal needle is embedded in the outer boss, and the outer end of the terminal needle penetrates out of one end face, far away from the stator, of the outer boss;

the conductive wiring terminal is wound at one end of the terminal pin close to the outer raised table and is connected with the coil on the stator;

a rotor penetrating the stator and rotatable relative to the stator;

the outer convex injury-preventing structure is connected to the outer convex platform and protrudes out of one end face, provided with the terminal needle, of the outer convex platform;

the convex height of the convex anti-injury structure from one end surface of the outer convex platform to the convex highest point of the convex anti-injury structure is equal to or larger than the axial length of the conductive terminal after the conductive terminal is axially compressed in place.

The stator comprises a coil pipe body and a ring opening shell sleeved on the coil pipe body, and a coil is wound on the coil pipe body.

The outer boss is connected to the outer wall of the coil pipe body;

the inner end of the terminal needle is embedded in the outer boss, and the outer end of the terminal needle penetrates out of one end face of the outer boss, which is far away from the spool body.

In the above permanent magnet stepping motor, the protruding anti-injury structure includes at least one protruding anti-injury boss disposed on an end surface of the protruding boss, and a protruding height of the protruding anti-injury boss is equal to or greater than an axial length of the conductive terminal after being axially compressed in place.

In the permanent magnet stepping motor, the outer convex injury-preventing boss is provided with an arc-shaped convex surface, and the height of the protrusion from the arc top of the arc-shaped convex surface to one end surface of the outer convex platform is equal to or greater than the axial length of the conductive wiring terminal after the conductive wiring terminal is axially compressed in place.

In the permanent magnet stepping motor, the outer convex anti-injury boss and the outer convex boss are integrally formed by injection molding.

In the permanent magnet stepping motor, four terminal needles are distributed at intervals, and an outer convex anti-injury boss positioned between two adjacent terminal needles is arranged on one end face of the outer convex boss.

In the permanent magnet stepping motor, the outer convex injury-preventing boss is in any one or combination of a long strip shape and a column shape.

As another solution, in the above permanent magnet stepping motor, the protruding anti-injury structure includes a plurality of anti-injury convex pillars having one end connected to the outer circumferential surface of the outer boss, the other end of the anti-injury convex pillar protrudes from an end surface of the outer boss where the terminal pin is disposed, and a protruding height of the anti-injury convex pillar protruding from the outer boss is equal to or greater than an axial length of the conductive terminal after being axially compressed in place.

In the above permanent magnet stepping motor, the motor further comprises a circuit board;

the circuit board is provided with an insertion hole for inserting the terminal pin, the circuit board is placed on the outer convex injury prevention structure, and the terminal pin penetrates through the insertion hole;

the conductive terminal is positioned between the circuit board and one end face of the outer boss, and the vertical distance between the circuit board and one end face of the outer boss is equal to or larger than the axial length of the conductive terminal after the conductive terminal is axially compressed in place;

the circuit board is connected with the conductive terminal in a welding mode.

In the permanent magnet stepping motor, the rotor is fixed on an output shaft, the output shaft is rotatably connected with the stator, and the output end of the output shaft is connected with a worm and gear output mechanism.

In the above permanent magnet stepping motor, the worm gear output mechanism includes:

one end of the worm is connected with the output end of the output shaft;

the worm wheel is meshed and connected with the worm;

the end face of one end of the stator is fixed on the support, the worm is rotatably connected with the support, and the worm wheel is rotatably connected with the support.

In the permanent magnet stepping motor, the bracket comprises a left end plate, a right end plate and a side plate for connecting the left end plate and the right end plate; the left end plate is opposite to the right end plate, and two ends of the worm are respectively and rotatably connected with the left end plate and the right end plate; the worm wheel is rotationally connected with the side plate.

In the permanent magnet stepping motor, the end face of one end of the stator, which is close to the worm, is fixed with the left end plate or the right end plate.

In the permanent magnet stepping motor, the worm wheel is arranged between the left end plate and the right end plate of the bracket.

In the permanent magnet stepping motor, the side plate is provided with the first mounting hole.

In the permanent magnet stepping motor, the middle of one long side of the side plate is also connected with the mounting plate.

In the permanent magnet stepping motor, the mounting plate is a right-angle plate.

Foretell permanent magnetism step motor, the side that the mounting panel was kept away from to the curb plate is equipped with the evagination extension board, and the worm wheel rotates to be installed on the evagination extension board.

The invention also provides electronic equipment with the permanent magnet stepping motor.

Compared with the prior art, the invention has the advantages that:

1. the outer bulge platform is designed with an outer bulge injury prevention structure, the outer bulge injury prevention structure can protect the conductive terminal when the conductive terminal is axially compressed in place, and the circuit board is subsequently supported by the weight of the circuit board when the circuit board is welded, so that the circuit board is prevented from being damaged due to the fact that the conductive terminal is pressed by the circuit board. Simultaneously at the welded in-process, on the plane of heat just can not directly transmit the evagination platform, even produce certain hot melt damage, also have the evagination and prevent hindering the structure and replace the plane and bear, the terminal needle is fixed stable, can improve welding quality and coil pipe terminal welding efficiency by a wide margin for manufacturing cost reduces by a wide margin, and the production qualification rate promotes by a wide margin.

2. The outer convex damage prevention structure is directly designed on the outer convex platform, so that the problems of abrasion and plane gouge are solved, and the difficulty in manufacturing and processing the conductive wiring end by axial compression is further reduced.

3. When the permanent magnet stepping motor drives the worm to rotate, the worm wheel can be pushed to rotate, and the structure has the advantages of simple calculation of transmission ratio, small occupied space, large transmission ratio and no idle stroke. The output mode of the mechanism is rotation, and the mechanism can be meshed with a next-stage gear and can also simply output rotation power.

4. The worm gear mechanism of the permanent magnet stepping motor is provided with the bracket, so that the whole mechanism can be ensured to work stably and accurately after being connected with the miniature permanent magnet stepping motor, and meanwhile, the worm gear mechanism is integrated into a whole and is convenient for modular application.

5. Meanwhile, the support mounting plate can be detached, the support mounting plate can be freely selected and assembled according to requirements during specific use, and the application range is wider.

Drawings

Fig. 1 is a schematic structural view of the stator provided by the present invention with the circuit board removed.

Fig. 2 is an enlarged schematic view of a portion a in fig. 1.

Fig. 3 is a schematic perspective view of fig. 1.

Fig. 4 is a schematic view of the stator structure provided by the present invention.

Fig. 5 is a schematic perspective view of fig. 4.

Fig. 6 is a schematic top view of a jig pressing plate used in the assembly process of the present invention.

Fig. 7 is a schematic structural diagram of a worm and gear output mechanism of a permanent magnet stepping motor provided by the invention.

Fig. 8 is a schematic structural diagram of an embodiment of a worm and gear output mechanism of a permanent magnet stepping motor provided by the invention.

Fig. 9 is a schematic structural diagram of the fourth embodiment of the present invention.

Fig. 10 is a schematic structural diagram of a permanent magnet stepping motor provided by the present invention.

In the figure, a coil pipe body 1, an outer boss 2, a terminal pin 3, a conductive terminal 4, an outer anti-injury structure 5, an outer anti-injury boss 50, an arc-shaped convex surface 51, an anti-injury boss 52, a circuit board 6, an insertion hole 60, a jig pressing plate 7, a worm wheel 9, a worm 10, a support 11, a right end plate 111, a side plate 112, a first mounting hole 112a, a left end plate 113, a worm wheel shaft 12, an extension plate 13, an extrusion height h, an axial length L, a ring opening 1a, a stator b, a rotor c, an output shaft d and a coil e.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 10, the present permanent magnet stepping motor includes:

the stator b has a cylindrical shape, and further has a cylindrical structure.

As shown in fig. 1, 2 and 4, the stator b of the present embodiment includes a bobbin body 1, a ring opening 1a with teeth and disposed on the bobbin body 1, and a bobbin terminal connected to the middle portion of the outer wall of the bobbin body 1, the bobbin terminal protrudes out of the outer wall of the ring opening 1a for facilitating subsequent assembly, such as soldering and fixing of a circuit board.

The outer boss 2 is connected to the stator b, preferably, the middle of the outer wall of the bobbin body 1, so that the enameled copper wires in the two wire grooves can be pulled and wound towards the middle; and the outer boss 2 protrudes outward from the outer wall of the collar 1a, namely, an avoiding through hole for the outer boss to enter is arranged in the middle of the outer wall of the collar 1 a.

Specifically, the outer boss 2 of the present embodiment is a flat block structure, and the outer boss 2 and the bobbin body 1 are integrally formed by injection molding, which not only improves the structural strength, but also further improves the production efficiency.

In addition, the end surface of the outer boss 2 far away from the spool body 1 is a plane, which is convenient for processing and manufacturing.

The inner end of the terminal needle 3 is embedded in the outer boss 2, and the outer end of the terminal needle penetrates out of one end face, far away from the spool body 1, of the outer boss 2; the inner end is embedded and fixed in an injection molding mode, so that the efficiency can be improved.

As shown in fig. 1 to 4, a conductive terminal 4, which is wound around one end of the terminal pin 3 near the outer ledge 2 and the conductive terminal 4 is connected to a coil e on the stator b; the winding direction is any one of clockwise and counterclockwise, the wound conductive terminal 4 is actually a spiral cylindrical structure, a gap exists between wires of the conductive terminal 4 due to a winding device and the like during winding, and in order to prevent the conductive terminal 4 from being damaged by compression when the gap is eliminated by compression and the conductive terminal 4 from being damaged by compression during subsequent circuit board welding, the following structure is used in the embodiment to solve the above problem:

the outer convex anti-injury structure 5 is connected on the outer convex platform 2, and the outer convex anti-injury structure 5 protrudes out of one end face of the outer convex platform 2, which is provided with the terminal needle 3;

the protrusion height h of the outer anti-snag structure 5 from an end face of the outer ledge 2 to the highest point of protrusion of the outer anti-snag structure 5 is equal to or greater than the axial length L of the conductive terminal 4 after being axially compressed in place.

As shown in fig. 10, the motor further includes a rotor c passing through the stator b and rotatable relative to the stator b; when the coil e of the stator b is energized, the rotor c can be rotated by the magnetic field of the rotor c, and the rotation angle is set to an actual control angle.

As shown in fig. 4 to 5, the motor further includes a circuit board 6, an insertion hole 60 into which the terminal pin 3 is inserted is provided on the circuit board 6, the circuit board 6 is placed on the external-projection atraumatic structure 5 and the terminal pin 3 penetrates the insertion hole 60;

the conductive terminal 4 is located between the circuit board 6 and an end face of the outer boss 2, and the vertical distance between the circuit board 6 and the circuit board 6 from the end face of the outer boss 2 is equal to or greater than the axial length L of the conductive terminal 4 after being axially compressed; the outer abuse prevention structure 5 forms a buffer protection space between the circuit board 6 and the above-mentioned plane.

The circuit board 6 is connected with the conductive terminal 4 in a welding mode.

The circuit board 6 is, for example, a PCB board.

The present embodiment directly utilizes the design of the external anti-scratch structure 5 on the external boss 2, and the external anti-scratch structure 5 at this time can protect the conductive terminal 4 when being axially compressed in place, and subsequently support the weight of the circuit board when the circuit board is soldered, so as to prevent the circuit board from pressing the conductive terminal 4 to cause damage. Simultaneously at the welded in-process, on the plane of heat just can not directly be transmitted to outer boss 2, even produce certain hot melt damage, also have the evagination to prevent hindering structure 5 and replace the plane to bear, the terminal needle is fixed stable, can improve welding quality and coil pipe terminal welding efficiency by a wide margin for manufacturing cost reduces by a wide margin, and the production qualification rate promotes by a wide margin.

Secondly, directly design evagination injury prevention structure 5 on outer bellying platform 2, solved the wearing and tearing problem and plane gouge problem, further reduced conductive connection terminal 4 by the axial compression manufacturing processing degree of difficulty.

Specifically, as shown in fig. 2 to 3, the outer anti-scratch structure 5 of the present embodiment includes at least one outer anti-scratch pad 50 disposed on an end surface of the outer anti-scratch pad 2, and the height h of the outer anti-scratch pad 50 is equal to or greater than the axial length L of the conductive terminal 4 after being axially compressed in place. Regarding the number of the outer atraumatic bosses 50, it may be set according to the actual manufacturing requirements, for example: the number of the convex injury-preventing bosses 50 is 1-5. The outer boss 2 is in a long strip shape, the outer protrusion damage-proof boss 50 is distributed along the width direction of one end face of the outer boss 2, and the end faces of two ends of the outer protrusion damage-proof boss 50 are respectively flush with two side faces in the thickness direction of the outer boss 2, so that the processing and manufacturing are convenient and the interference is prevented.

The convex injury-preventing boss 50 is directly designed on one end face of the outer boss 2, the radial direction of the outer boss 2 is reduced, the occupied space volume is reduced, the overall structure is more compact, and meanwhile, the protection requirement can be met.

Preferably, the outer protrusion injury-preventing projection 50 has an arc-shaped convex surface 51, and a projection height h from an arc top of the arc-shaped convex surface 51 to an end surface of the outer protrusion 2 is equal to or greater than an axial length L of the conductive terminal 4 after being axially compressed in place. The arc convex surface 51 can facilitate injection molding processing, reduce the contact surface with the circuit board and protect circuit elements of the circuit board. Of course, the curved convex surface 51 may be replaced by a horizontal surface, and may also be replaced by other structural surfaces, and the alternatives are not exhaustive in the embodiment.

Preferably, the outer anti-snag boss 50 and the outer boss 2 are integrally injection molded. The production efficiency can be greatly improved by integrally forming the connecting structure, and the strength of the connecting structure between the two can be improved.

Preferably, the terminal pins 3 of the present embodiment are four and spaced apart, and an outer anti-injury boss 50 is provided on one end surface of the outer boss 2 between two adjacent terminal pins 3. Namely, there are three outward anti-injury bosses 50 to form an interval protection, which can prevent a single protection from causing a weak protection effect on the conductive terminal 4.

On the premise that the enameled copper wire is wound on the terminal pin to form the conductive terminal 4, the circuit board assembling method of the embodiment comprises the following steps: as shown in the figures 4-6 of the drawings,

s1, axially compressing, namely axially compressing the conductive terminal 4 wound on the terminal pin 3 by using a jig pressing plate 7 vertically distributed with the terminal pin 3, axially compressing the conductive terminal 4 in place when the jig pressing plate 7 is contacted with the outer anti-injury structure 5 on the outer boss 2, and separating the jig pressing plate 7 from the terminal pin 3 and resetting;

the jig pressing plate 7 is provided with a matching hole 70 which is clearance-matched with the terminal pin 3 so that the terminal pin 3 can be inserted, and the aperture of the matching hole is equal to or larger than the inner diameter of the conductive terminal 4.

And S2, welding, aligning the insertion holes 60 on the circuit board 6 with the terminal pins 3, then placing the circuit board 6 on the outer anti-injury structure 5, leaving a buffer protection space between the circuit board 6 and one end face of the outer boss 2 provided with the terminal pins 3, and welding the circuit board 6 and the conductive terminals 4 to be connected by welding, namely completing the assembly of the coil terminal.

In the above step S1, the terminal pins 3 are in a vertical state; the jig pressing plate 7 is positioned above the upper end of the terminal pin 3 and can be lifted in the vertical direction.

Further, as shown in fig. 7 and 8, the rotor c of the present embodiment is fixed on an output shaft d, and the output shaft d is rotatably connected with the stator b, for example, both ends of the output shaft d are rotatably connected with both ends of the stator b by using a bearing sleeve or the like.

The output end of the output shaft d is connected with a worm gear output mechanism. Specifically, the worm gear output mechanism of the present embodiment includes:

one end of the worm 10 is connected with the output end of the output shaft d;

the worm wheel 9 is meshed and connected with the worm 10;

the end face of one end of the stator b is fixed on the bracket 11, the worm 10 is rotatably connected with the bracket 11, and the worm wheel 9 is rotatably connected with the bracket 11.

One end of the worm 10 is bonded to the output shaft d for outputting torque, but may be bonded to the rotor. Because the permanent magnet stepping motor is adopted in the embodiment, the rotor is a magnet (generally, permanent magnet steel), one end of the worm is directly bonded on the magnet, of course, the connection mode of the rotor and the worm can also be realized by adopting a mechanical matching mode, and the embodiment does not further describe the connection mode. The worm wheel 9 is meshed with the spiral teeth on the worm 10. The spiral teeth on the worm 10 are provided only in the middle of the worm 10 in this embodiment. The position and the number of the spiral teeth can be set according to actual requirements during specific implementation.

As shown in fig. 7 and 8, the bracket 11 includes a left end plate 113, a right end plate 111, and a side plate 112 connecting the left end plate 113 and the right end plate 111. The left end plate 113 is opposed to the right end plate 111. The end surface of the stator b near one end of the worm 10 is fixed with the left end plate 113 or the right end plate 111 according to the use requirement. In this embodiment, the right end plate 111 is fixed, and specific fixing modes include adhesion or flat key and keyway fit and the like.

The worm wheel 9 comprises a worm wheel shaft 12 and at least one gear, the worm wheel shaft 12 is rotatably connected in the mounting hole of the mounting plate 112, and a bearing or a shaft sleeve can be arranged between the worm wheel shaft 12 and the mounting hole to improve the rotation stability of the worm wheel shaft 12. The worm wheel 9 is mounted between the left end plate 113 and the right end plate 111 of the bracket, and is located at a middle position. However, in practical implementation, the worm may be disposed at any position between the left end plate 113 and the right end plate 111, even outside the other end plate that is not fixed to the permanent magnet stepping motor, only the worm needs to extend correspondingly. Therefore, the structure of the bracket 11 makes the whole mechanism have a larger space to be freely used when being connected with an external product.

As shown in fig. 8, the side plate 112 is provided with a first mounting hole 112a, where the mounting holes are arranged at positions and numbers according to use requirements, and are not limited to the positions in the drawing.

A mounting plate is also attached to a middle portion of a long side of the side plate 112. And the mounting plate in this embodiment is a right-angle plate, of course, the shape of the mounting plate is not limited to a straight plate, and is not exhaustive here. In this embodiment, the mounting plate is disposed in the middle of a long side of the side plate 112, and there are gaps between two sides of the mounting plate and the left and right end plates 113 and 111, so that some external products may need a mounting space. In specific implementation, the large length of the mounting plate can be freely set according to the use requirement and is not limited to the description in the attached drawings.

As shown in FIG. 8, a convex extension plate 13 is arranged on one side of the side plate 112 away from the mounting plate, and the worm wheel 9 is rotatably mounted on the convex extension plate 13. In this embodiment, the outward extending plate 13 is disposed in the middle of the side edge of the side plate 112, and the outward extending plate 13 is changed according to the position of the worm wheel 9, and is not necessarily disposed in the middle of the side edge of the side plate 112, but may be disposed at any position of the side edge.

Generally, the material of all mounting plates of the bracket is SECC, and the thickness is about 1 mm. Of course, the material and thickness can be adjusted according to actual needs. In practical use, through holes or threaded holes are drilled in the mounting plate according to requirements (such requirements are not only mounting requirements, but also machining requirements), and the invention is not limited to the above embodiment.

When the permanent magnet stepping motor is electrified, the rotor rotates to drive the worm to rotate, and the worm is output through the worm wheel.

Example two

The structure and principle of the present embodiment are basically the same as those of the first embodiment, and the different structure is as follows: the outer anti-injury boss 50 is in a cylindrical shape and is directly provided on one end surface of the outer boss 2.

Of course, it is also possible to provide a cylindrical outer scratch prevention boss and a strip-shaped outer scratch prevention boss on one end surface of the outer boss 2, and the embodiments are not exhaustive for the outer scratch prevention bosses with different shapes.

EXAMPLE III

The structure and principle of the present embodiment are basically the same as those of the first embodiment, and the different structure is as follows: the outer anti-scratch bosses 50 are distributed along the length direction of one end surface of the outer boss 2. And during distribution, the enameled copper wires are avoided.

Example four

The structure and principle of the present embodiment are basically the same as those of the first embodiment, and the different structure is as follows: as shown in fig. 9, the external anti-injury structure 5 includes a plurality of anti-injury convex pillars 52 having one end connected to the outer circumferential surface of the external boss 2, the other end of the anti-injury convex pillars 52 protrudes from an end surface of the external boss 2 where the terminal pin 3 is disposed, and a protrusion height h of the anti-injury convex pillars 52 protruding from the external boss 2 is equal to or greater than the axial length L of the conductive terminal 4 after being axially compressed in place.

That is, the anti-injury convex columns 52 are designed on the outer circumferential surface, which can also meet the use requirement, preferably, at least one anti-injury convex column 52 is respectively arranged on two opposite side surfaces of the outer convex platform 2, and the anti-injury convex columns 52 arranged on the two opposite side surfaces are symmetrically distributed or are distributed in a staggered way. And the protruding section can form the functions of ultimate protection and supporting gravity, and can also meet the requirements of the production process.

Secondly, the end surface of the injury-preventing convex column 52 far away from the outer convex table 2 is any one of a horizontal surface and a spherical surface.

EXAMPLE five

Based on the basis of embodiment one to fourth, as shown in fig. 4, the stator of this embodiment includes bobbin body 1, is the tube-shape and through moulding plastics integrated into one piece, has the wire winding groove of two intervals settings in bobbin body 1 outside to in winding of enameled copper line establish, around there being enameled copper line in the wire winding groove.

The coil terminal is further provided as described in embodiments one to four.

EXAMPLE six

The structure of this embodiment is substantially the same as that of the first embodiment, and the difference lies in that: the worm is not only output through the worm wheel, but output through the dual gear of the worm wheel and the gear together, as shown in fig. 8 in particular.

EXAMPLE seven

Based on the first to sixth embodiments, the electronic device of the present embodiment includes the permanent magnet stepping motor as described in the first to sixth embodiments. Electronic devices are described in the background section.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.