CN216531041U

CN216531041U - Stepping motor

Info

Publication number: CN216531041U
Application number: CN202123183020.1U
Authority: CN
Inventors: 季良锋; 党红关; 任红伟
Original assignee: Anhui Leili Intelligent Technology Co ltd
Current assignee: Anhui Leili Intelligent Technology Co ltd
Priority date: 2021-12-17
Filing date: 2021-12-17
Publication date: 2022-05-13
Anticipated expiration: 2031-12-17

Abstract

The utility model discloses a stepping motor, which comprises an upper shell assembly, a lower shell assembly, a coil assembly and a connector assembly, wherein the coil assembly and the connector assembly are positioned between the upper shell assembly and the lower shell assembly; the coil assembly and the connector are electrically connected through a flexible circuit board; the upper shell assembly is provided with a partition plate extending towards the lower shell assembly, and the connecting ends of the flexible circuit board, the coil assembly and the connector are respectively positioned at two sides of the partition plate. According to the stepping motor, the flexible circuit board is adopted to connect the plug connector and the coil assembly, meanwhile, the flexible circuit board is separated from the welding points of the plug connector and the coil assembly through the partition board, the flexible characteristic of the flexible circuit board can absorb vibration waves, the phenomena of welding point disconnection and enameled wire fracture caused by vibration impact are avoided, the partition board can effectively avoid the phenomena of two welding points breakdown and short circuit, the distance between the two welding points can be smaller, and therefore the size of the motor is reduced.

Description

Stepping motor

Technical Field

The utility model relates to the technical field of motor design, in particular to a stepping motor.

Background

In the existing motor stator assembly, a connector and a coil assembly are connected by soldering through binding posts of two parts; the main problems of this connection method are: (1) the tin soldering connection operation is inconvenient, the efficiency is low, and the automatic welding is not convenient to realize; (2) the soldering connection of the binding post is hard connection, and the vibration impact stress easily causes the disconnection of welding points and the breakage of enameled wires.

There is also a structure in the prior art (publication No. CN1297273A) in which a terminal pin and a connector pin of a motor winding are connected by a flexible circuit board, and because the space of the connector portion is large, it is not necessary to consider the phenomena of breakdown and short circuit caused by two welding points being close, but this increases the size of the motor and increases the cost of the motor.

SUMMERY OF THE UTILITY MODEL

The utility model provides a stepping motor for solving the technical problems that in the stepping motor in the prior art, if a connector and a coil assembly are connected through a binding post in a tin soldering mode, welding spots are easy to fall off, if the connector and the coil assembly are connected through a flexible circuit board, the size of the motor is increased, and the cost of the motor is increased.

The technical scheme adopted by the utility model for solving the technical problems is as follows: a stepping motor comprises an upper shell assembly, a lower shell assembly, a coil assembly and a connector assembly, wherein the coil assembly and the connector assembly are positioned between the upper shell assembly and the lower shell assembly; the coil assembly and the connector are electrically connected through a flexible circuit board; the upper shell assembly is provided with a partition plate extending towards the lower shell assembly, and the connecting ends of the flexible circuit board, the coil assembly and the connector are respectively positioned at two sides of the partition plate.

Furthermore, the flexible circuit board is of a U-shaped structure, and the opening direction of the flexible circuit board is opposite to the extending direction of the partition board.

Furthermore, welding holes are formed in the two ends of the flexible circuit board, the welding holes in one end of the flexible circuit board are welded and fixed with the wiring terminals of the connector, and the welding holes in the other end of the flexible circuit board are welded and fixed with the contact pins of the coil assembly.

Furthermore, both ends of the flexible circuit board are provided with reinforcing plates, and the welding holes are located on the reinforcing plates.

Furthermore, the upper housing assembly comprises an upper cover plate, and a coil fixing part and an insert fixing part which are fixed at the bottom of the upper cover plate, wherein the coil fixing part is suitable for fixing the coil assembly, and the insert fixing part is suitable for fixing the connector.

Further, the connector has a shoulder portion extending in the direction of the upper cover plate, and the connector fixing portion is a fixing groove adapted to be inserted by the shoulder portion.

Furthermore, the coil assembly comprises a coil framework and a middle pole plate positioned in the middle of the coil framework, and the flexible circuit board is welded and fixed with the contact pins on the coil framework; the periphery of well polar plate is equipped with radial lug, the coil fixed part is including being suitable for the annular seat that coil skeleton was inserted, have the breach that is suitable for radial lug to insert on the annular seat.

Furthermore, the lower casing assembly comprises a lower cover plate suitable for wrapping the coil assembly and the connector, and the lower cover plate and the upper casing assembly are respectively provided with a buckle and a clamping hook which are mutually buckled.

Furthermore, a terminal holding groove is formed between the partition plate and the fixing groove, and an anti-error rib abutted against the end face of the connector is arranged at one end, facing the terminal holding groove, of the partition plate.

Furthermore, one end of the connector, which faces the flexible circuit board, is provided with a reinforcing rib which is suitable for being in interference fit with the fixing groove, and the upper end of the reinforcing rib is provided with a first chamfer.

Furthermore, the buckle is positioned on the lower cover plate, the hook is positioned on the upper shell component, and the hook is buckled with the buckle from the inner side of the lower cover plate; and a second chamfer is arranged at the upper end of the buckle.

Furthermore, the connector comprises a junction box and a plurality of binding posts, one end of the junction box is provided with a through hole suitable for the binding post to pass through, and the binding post positioned in the through hole is provided with two or more than two radial expansion sections.

The utility model has the beneficial effects that:

according to the stepping motor, the flexible circuit board is adopted to connect the plug connector and the coil assembly, meanwhile, the flexible circuit board is separated from the welding points of the plug connector and the coil assembly through the partition board, the flexible characteristic of the flexible circuit board can absorb vibration waves, the phenomena of welding point disconnection and enameled wire fracture caused by vibration impact are avoided, the partition board can effectively avoid the phenomena of two welding points breakdown and short circuit, the distance between the two welding points can be smaller, and therefore the size of the motor is reduced.

Drawings

The utility model is further illustrated with reference to the following figures and examples.

FIG. 1 is a perspective view of an embodiment of a stepper motor according to the present invention;

FIG. 2 is a cross-sectional view of an embodiment of a stepper motor according to the present invention;

FIG. 3 is an exploded schematic view of an embodiment of the stepper motor of the present invention;

FIG. 4 is a top view of the connection of the flexible circuit board to the coil assembly and connector assembly of the present invention;

FIG. 5 is a side view of the connection structure of FIG. 4;

FIG. 6 is a schematic view of the assembly of the upper housing assembly and the stator assembly of the present invention;

FIG. 7 is a perspective view of a flexible wiring board in the present invention;

FIG. 8 is a perspective view of a connector of the present invention;

FIG. 9 is a front view of the terminal post of the present invention;

FIG. 10 is a cross-sectional view of a connector of the present invention;

FIG. 11 is a perspective view of the upper housing assembly of the present invention;

fig. 12 is a perspective view of the lower housing assembly of the present invention.

In the figure, 1, an upper housing assembly, 101, a partition plate, 1011, an error-proof rib, 102, an upper cover plate, 103, a fixing groove, 104, a base, 105, an annular seat, 1051, a notch, 106, a terminal holding groove, 107, a snap hook, 2, a lower housing assembly, 201, a lower cover plate, 202, a buckle, 2021, a second chamfer, 3, a coil assembly, 301, a pin, 302, a coil framework, 303, a middle pole plate, 3031, a radial bump, 4, a connector, 401, a terminal, 4011, a radial expansion section, 402, a shoulder, 403, a reinforcing rib, 4031, a first chamfer, 404, a terminal box, 5, a flexible circuit board, 501, a welding hole, 502 and a reinforcing plate.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

As shown in fig. 1 to 12, a stepping motor includes an upper case assembly 1, a lower case assembly 2, and a coil assembly 3 and a connector 4 between the upper case assembly 1 and the lower case assembly 2; the coil assembly 3 and the connector 4 are electrically connected through a flexible circuit board 5; the upper housing unit 1 has a partition 101 extending toward the lower housing unit 2, and the connection ends of the flexible wiring board 5 and the coil unit 3 and the connector 4 are located on both sides of the partition 101.

The terms "upper" and "lower" in the present invention refer to the positional relationship between the parts in the use state, as shown in fig. 3, in the use state, the upper housing assembly 1 is located at the uppermost position, the lower housing assembly 2 is located at the lowermost position, and the coil assembly 3, the flexible circuit board 5 and the connector assembly 4 (which constitute a stator assembly) are located at the middle position, and those skilled in the art can understand that the stepping motor usually further includes a rotor assembly located at the inner periphery of the coil assembly 3, which is common knowledge in the art, and therefore, the present invention does not specifically describe the same, and the flexible circuit board 5 is made of flexible material capable of being bent and deformed. When the motor vibrates in the use process, the flexible circuit board 5 can deform according to the fluctuation condition, so that the phenomenon that the welding points of the coil assembly 3, the connector 4 and the flexible circuit board 5 are broken due to inconsistent fluctuation can be avoided. Meanwhile, the flexible wiring board 5 is separated from the connecting ends of the coil block 3 and the connector 4 by the partition 101, so that a large space does not need to be left between the coil block 3 and the connector 4, and the phenomena of breakdown and short circuit do not occur.

In order to make the flexible printed circuit 5 have a certain deformation space (including an extended space and a shortened space), the flexible printed circuit 5 is preferably bent in the initial state, in a preferred embodiment of the present invention, as shown in fig. 3, the flexible printed circuit 5 is in a U-shaped structure, and the opening direction of the flexible printed circuit 5 is opposite to the extending direction of the partition 101, that is, the middle part of the flexible printed circuit 5 is located below the two ends of the flexible printed circuit 5. After one end of the flexible wiring board 5 is connected to the connector 4, the other end thereof passes under the spacer 101 and is extended upward to be connected to the coil block 3, while bypassing the spacer 101.

The connection of the flexible wiring board 5 to the connector 4 and the coil block 3 may be, but not limited to, the following structure: welding holes 501 are formed in two ends of the flexible circuit board 5, the welding hole 501 at one end of the flexible circuit board 5 is fixedly welded with the wiring terminal 401 of the connector 4, and the welding hole 501 at the other end of the flexible circuit board 5 is fixedly welded with the pin 301 of the coil assembly 3. Because the strength requirement of the welded portion on the component is high, it is preferable to provide the reinforcing plates 502 at both ends of the flexible printed circuit 5, and the welding holes 501 are located on the reinforcing plates 502, as shown in fig. 7, which is a schematic view of the flexible printed circuit 5 when it is not bent, and the middle portion of the flexible printed circuit 5 is a substrate, which is convenient for bending during assembly.

Mounting of coil assembly 3 and connector 4:

the upper housing assembly 1 includes an upper cover plate 102, and a coil fixing portion adapted to fix the coil assembly 3 and an insert fixing portion adapted to fix the connector 4, which are fixed to the bottom of the upper cover plate 102.

The connector 4 has a shoulder 402 extending toward the upper cover 102, and the connector fixing portion is a fixing groove 103 adapted to be inserted by the shoulder 402. As shown in fig. 6, 8 and 11, the shoulder 402 extends toward the fixing groove 103, the shoulder 402 is equivalent to a card board inserted into the fixing groove 103 and used for fixing one end of the connector 4, when the top surface of the connector 4 is uneven, the bottom of the upper housing assembly 1 may be further provided with a base 104, the top surface of the connector 4 is attached to the base 104, the top surface of the connector 4 is the top surface of the lower connector 4 in a use state, and fig. 5, 6, 8 and 11 are schematic diagrams of a motor after being turned upside down, so that the base 104 is shown at the bottom surface of the connector 4 in fig. 6.

As shown in fig. 3 and 6, the coil assembly 3 includes a coil bobbin 302 and a middle pole plate 303 located in the middle of the coil bobbin 302, the coil bobbin 302 is used for winding an enameled wire, the middle pole plate 303 is used for mounting and fixing the coil assembly and the upper housing assembly 1, and the flexible circuit board 5 is welded and fixed with the pins 301 on the coil bobbin 302; the periphery of the middle pole plate 303 is provided with a radial projection 3031, the coil fixing part comprises an annular seat 105 suitable for inserting the coil framework 302, and the annular seat 105 is provided with a notch 1051 suitable for inserting the radial projection 3031.

During installation, the flexible circuit board 5 is fixedly attached to the connector 4 through a tool, then soldering tin is fixedly connected with a welding machine, the contact pins 301 on the ring framework 302 and the soldering tin of the flexible circuit board 5 are fixedly connected to form a stator assembly, when the stator assembly is assembled with the upper shell assembly 1, the radial convex blocks 3031 on the middle pole plate 303 and the notches 1051 on the annular seat 105 are matched and fixed, the flexible circuit board 5 is located at the position of the partition plate 101, and the connector 4 is fixedly installed in the fixing groove 103 of the upper shell assembly 1.

The connector 4 and the fixing groove 103 are fixed by interference fit, specifically, as shown in fig. 8, one end of the connector 4 facing the flexible printed circuit 5 is provided with a reinforcing rib 403 adapted to be in interference fit with the fixing groove 103, in order to facilitate insertion of the connector 4, the upper end of the reinforcing rib 403 is provided with a first chamfer 4031, when the connector 4 is inserted into the fixing groove 103, the first chamfer 4031 first contacts the fixing groove 103, and the connector can be smoothly inserted into the fixing groove 103 by virtue of the gradient of the first chamfer 4031.

Connector 4 usually includes terminal box 404 and several terminal 401, terminal 401 passes through the lateral wall of terminal box 404, because terminal 401 need stretch out terminal box 404, therefore need to leave terminal holding groove 106 between fixed slot 103 and baffle 101, usually the width of terminal holding groove 106 is great, avoid producing the interference with terminal 401, then can lead to the wrong position of inserting when connector 4 assembles with upper casing subassembly 1 (connector 4 may insert terminal holding groove 106, lead to terminal 401 to damage), for this reason, as preferred, as shown in fig. 6 and 11, the one end towards terminal holding groove 106 on baffle 101 has the mistake proofing muscle 1011 of butt with the terminal surface of connector 4. The misalignment preventing rib 1011 can block the connector 4 so that the connector 4 cannot be inserted into the terminal receiving groove 106, and the misalignment preventing rib 1011 needs to be arranged so as to avoid the terminal 401.

The terminal 401 and the junction box 404 are fixed together by injection molding, in order to increase the drawing strength of the terminal 401 after injection molding and ensure that the terminal 401 does not loosen during welding, preferably, one end of the junction box 404 is provided with a through hole suitable for the terminal 401 to pass through, and the terminal 401 positioned in the through hole is provided with two or more than two radial expansion sections 4011. As shown in fig. 9 and 10, the radially expanded section 4011 is provided with two sections, and the radial side of the radially expanded section 4011 is slightly bulged.

Assembling the lower shell assembly 2 and the upper shell assembly 1:

the lower housing assembly 2 includes a lower cover plate 201 adapted to cover the coil assembly 3 and the connector 4, and the lower cover plate 201 and the upper housing assembly 1 are respectively provided with a snap 202 and a hook 107. In the specific embodiment of the present invention, as shown in fig. 3, 11 and 12, the buckle 202 is located on the lower cover plate 201, the hook 107 is located on the upper housing component 1, four buckles 202 and four hooks 107 are symmetrically arranged, and the hook 107 is fastened to the buckle 202 from the inner side of the lower cover plate 201; similar to the interference fit between the connector 4 and the fixing groove 103, in order to facilitate the hook 107 to be easily fastened to the buckle 202, the upper end of the buckle 202 is provided with a second chamfer 2021.

Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the term "connected" is to be interpreted broadly, e.g. as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In this specification, the schematic representations of the terms are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations can be made by the worker in the light of the above teachings without departing from the spirit of the utility model. The technical scope of the present invention is not limited to the content of the description, and must be determined according to the scope of the claims.

Claims

1. A stepping motor characterized by: the coil assembly comprises an upper shell assembly (1), a lower shell assembly (2), and a coil assembly (3) and a connector assembly (4) which are positioned between the upper shell assembly (1) and the lower shell assembly (2);

the coil assembly (3) and the connector (4) are electrically connected through a flexible circuit board (5);

the upper shell assembly (1) is provided with a partition plate (101) extending towards the lower shell assembly (2), and the connecting ends of the flexible circuit board (5), the coil assembly (3) and the connector (4) are respectively positioned at two sides of the partition plate (101).

2. The stepping motor according to claim 1, wherein: the flexible circuit board (5) is of a U-shaped structure, and the opening direction of the flexible circuit board (5) is opposite to the extending direction of the partition board (101).

3. The stepping motor according to claim 1, wherein: welding holes (501) are formed in the two ends of the flexible circuit board (5), the welding holes (501) in one end of the flexible circuit board (5) are fixedly welded with the wiring terminal (401) of the connector (4), and the welding holes (501) in the other end of the flexible circuit board (5) are fixedly welded with the pins (301) of the coil assembly (3).

4. The stepping motor according to claim 3, wherein: both ends of flexible line way board (5) are equipped with stiffening plate (502), welding hole (501) are located stiffening plate (502).

5. The stepping motor according to claim 1, wherein: the upper shell assembly (1) comprises an upper cover plate (102), and a coil fixing part and an insert fixing part which are fixed at the bottom of the upper cover plate (102), wherein the coil fixing part is suitable for fixing the coil assembly (3), and the insert fixing part is suitable for fixing the connector assembly (4).

6. The stepping motor according to claim 5, wherein: the connector (4) is provided with a shoulder part (402) extending towards the upper cover plate (102), and the connector fixing part is a fixing groove (103) suitable for the shoulder part (402) to be inserted.

7. The stepper motor as defined in claim 5, wherein: the coil assembly (3) comprises a coil framework (302) and a middle pole plate (303) positioned in the middle of the coil framework (302), and the flexible circuit board (5) is welded and fixed with a contact pin (301) on the coil framework (302);

the periphery of the middle pole plate (303) is provided with a radial bump (3031), the coil fixing part comprises an annular seat (105) suitable for inserting the coil framework (302), and the annular seat (105) is provided with a notch (1051) suitable for inserting the radial bump (3031).

8. The stepping motor according to claim 1, wherein: the lower shell assembly (2) comprises a lower cover plate (201) suitable for wrapping the coil assembly (3) and the connector (4), and the lower cover plate (201) and the upper shell assembly (1) are respectively provided with a buckle (202) and a hook (107) which are buckled with each other.

9. The stepping motor according to claim 6, wherein: a terminal containing groove (106) is formed between the partition plate (101) and the fixing groove (103), and an anti-error rib (1011) which is abutted against the end face of the connector (4) is arranged on one end of the partition plate (101) facing the terminal containing groove (106).

10. The stepping motor according to claim 6, wherein: one end of the connector (4) facing the flexible circuit board (5) is provided with a reinforcing rib (403) suitable for interference fit with the fixing groove (103), and the upper end of the reinforcing rib (403) is provided with a first chamfer (4031).

11. The stepping motor according to claim 8, wherein: the buckle (202) is positioned on the lower cover plate (201), the hook (107) is positioned on the upper shell component (1), and the hook (107) is buckled with the buckle (202) from the inner side of the lower cover plate (201);

the upper end of the buckle (202) is provided with a second chamfer (2021).

12. The stepping motor according to claim 5, wherein: the connector (4) comprises a junction box (404) and a plurality of binding posts (401), one end of the junction box (404) is provided with a through hole suitable for the binding post (401) to pass through, and the binding post (401) positioned in the through hole is provided with two or more than two radial expansion sections (4011).