small stepper motor

Abstract

This utility model relates to a small stepper motor, comprising: a housing assembly, a stator assembly, and a rotor assembly; the housing assembly includes: an upper housing and a lower housing symmetrically arranged, and a mounting plate mounted on the outer surface of the upper housing and / or the lower housing; the upper housing and the lower housing are connected to form a receiving cavity for accommodating the stator assembly; the rotor assembly is sleeved within the stator assembly, and the rotor assembly has a motor shaft extending out of the upper housing; the receiving cavity has a positioning notch at the connection between the upper housing and the lower housing; the stator assembly includes a terminal extending from the positioning notch in the radial direction of the motor shaft; the mounting plate has a positioning support portion, forming a limiting structure after the terminal is inserted into the mating part. Initial fixation is achieved by inserting the terminal into the mating part, and then the positioning support portion on the mounting plate engages with the mating part, improving the stability of the assembly between the motor and the client.

Description

Technical Field

[0001] This utility model relates to the field of stepper motor technology, and in particular to a small stepper motor. Background Technology

[0002] With the miniaturization of automotive air conditioning vent actuators, the motors used in these mechanisms require greater torque, easier installation, and smaller size. This is the main direction for improving and applying motors used in automotive air conditioning vent actuators.

[0003] Meanwhile, in the process of adapting the motor to the client-side interface, existing technologies typically use screws to connect the motor and the mechanical components. This can lead to component deformation during assembly, resulting in larger assembly gaps, and the addition of components can increase overall vibration transmission. Furthermore, the assembly of the motor and client-side interface is unstable and prone to tilting to one side due to motor vibration. Utility Model Content

[0004] The technical problem to be solved by this utility model is: in order to solve the problem of increased assembly gap caused by screw connection between motor and docking part in the above-mentioned background technology, as well as the risk of unstable assembly and tilting to one side due to motor vibration, a small stepper motor is provided. It is initially fixed by plugging in the terminal block to the docking part, and then the positioning support part on the mounting plate is used to snap in with the docking part, which improves the stability of the assembly between motor and docking part. Moreover, it can be directly assembled without the need for additional screw fastening.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: a small stepper motor, comprising: a housing assembly, a stator assembly, and a rotor assembly; the housing assembly includes: an upper housing and a lower housing symmetrically arranged; the upper housing and the lower housing are connected to form a receiving cavity for accommodating the stator assembly; the rotor assembly is sleeved inside the stator assembly, and the rotor assembly is provided with a motor shaft extending out of the upper housing; the housing assembly further includes: a mounting plate installed on the outer surface of the upper housing and / or the lower housing; the receiving cavity has a positioning notch at the connection between the upper housing and the lower housing; the stator assembly includes a terminal extending out of the positioning notch in the radial direction of the motor shaft; the mounting plate is provided with a positioning support, forming a limiting structure after the terminal and the mating part are inserted. Initial fixation is achieved by inserting the terminal and the mating part, and then the positioning support on the mounting plate is used to snap the connection with the mating part, improving the stability of the motor and the mating part assembly, and allowing for direct assembly without the need for additional screw fastening.

[0006] Furthermore, there are two mounting plates, one on the upper surface of the upper housing and the other on the lower surface of the lower housing. The two mounting plates are symmetrically arranged so that the sides of the two positioning supports form support surfaces parallel to the axial direction of the motor shaft. This layout, after the motor and the mating parts are installed, not only results in a more stable installation but also improves the parallelism and concentricity between the motor shaft and the mating parts, reducing mechanical resistance and torque loss, and increasing the output torque of the entire mechanism. Moreover, with the mounting plates positioned at the top and bottom of the motor, this layout allows for better matching with the customer's mating parts, and the force points are balanced on both sides of the motor, resulting in greater stability after the motor and mating parts are assembled.

[0007] Furthermore, the positioning support includes: an outer support section that is centrally located and protruding, and inner support sections symmetrically distributed on both sides of the outer support section. The inner support section is used to mate with the surface of the mating part, and the outer support section is used to engage with the slot of the mating part, making the installation simple and effectively stable. The outer support section and the inner support section form two support surfaces for matching with the mating part. Compared with a single support surface, multiple support points can be formed, making the installation more stable. Moreover, it can be directly fitted during assembly without the need for additional screws for fastening.

[0008] Furthermore, the stator assembly also includes: a first coil frame and a second coil frame fixedly connected vertically; the upper surface of the first coil frame is fitted to the inner surface of the upper housing; the lower surface of the second coil frame is fitted to the inner surface of the lower housing; a first terminal block holder is provided at the lower edge of the first coil frame; a second terminal block holder is provided at the upper edge of the second coil frame; the two terminals fixed to the first terminal block holder and the two terminals fixed to the second terminal block holder are located on the same horizontal plane.

[0009] Furthermore, both the first and second terminal block retainers are provided with support feet on the side away from the terminal block. These support feet enable better positioning and assembly with the mating parts, reducing the risk of increased assembly gaps between components.

[0010] Furthermore, the two support legs are located on different planes, forming a stepped structure. The two support legs are staggered, and this layout forms an installation surface when assembling with the mating parts. This transforms line contact into surface contact, balancing the stress points, preventing unilateral tilting after assembly, and ensuring stable installation.

[0011] Furthermore, the support leg includes an inner section; the inner section is arc-shaped on the side near the terminal; an enameled wire segment is provided on the terminal; the arc-shaped cross-section of the inner section is located on the outer side of the enameled wire segment. The inner section maintains a sufficient distance from the protruding surface of the terminal, so that after the mating part is assembled with the inner section of the support leg, it provides support, preventing further downward displacement. Moreover, the supporting surface formed by the inner section is located at the front end of the enameled wire segment, preventing collision damage to the enameled wire segment at the bottom of the terminal and avoiding quality risks.

[0012] Furthermore, the support foot also includes an extension section extending radially along the motor shaft from its inner side; the extension section is adapted to be inserted into the mating component. The inner side is used to contact and fix the support with the mounting surface of the mating component, while the extension section is used for positioning guidance during installation and lateral limiting after installation; the extension section can also adjust its extension length and size, making it convenient for customers to use after being fitted with the mating component, and to achieve grounding function by adding welding or wiring, without the need for additional parts to achieve grounding function, thus reducing production costs.

[0013] Furthermore, the rotor assembly also includes: a magnetic ring integrally formed with the motor shaft; the magnetic ring is sleeved on the outside of the motor shaft; the magnetic ring includes: a circular groove located in the middle, and a first magnetic ring and a second magnetic ring respectively corresponding to the first coil frame and the second coil frame. The integral formation of the motor shaft and the magnetic ring strengthens the overall magnetic ring strength, avoids the risk of magnetic ring damage, and maintains the integrity and continuity of the entire magnetic circuit. The circular groove in the middle of the magnetic ring reduces the weight of the magnetic ring without affecting overall performance, reduces the rotational inertia of the motor shaft, reduces magnetic interference and internal resistance of the motor, further reduces the back electromotive force interference and self-positioning torque of the motor, and to a certain extent, while increasing torque and expanding the response frequency range, also reduces motor vibration and improves sound quality.

[0014] Furthermore, a first bearing is embedded in the mounting plate on the upper surface of the upper housing; a second bearing is embedded in the mounting plate on the lower surface of the lower housing; and both ends of the motor shaft are respectively fitted with the first bearing and the second bearing. By setting the first bearing and the second bearing, the motor shaft is limited to prevent positional displacement caused by prolonged rotation of the motor shaft.

[0015] The beneficial effects of this utility model are:

[0016] (1) The upper and lower housings adopt the same symmetrical structure, which simplifies the overall structure. The mounting plate adopts a multi-positioning point design. The inner support section is used to connect with the surface of the docking part, and the outer support section is used to engage with the slot of the docking part, making the installation simple and effective. The support surface formed by the two mounting plates is parallel to the motor shaft output shaft, which enhances the concentricity and parallelism with the docking part after installation, increases the matching degree of the output area, and thus improves the overall performance of the mechanism.

[0017] (2) The two support feet adopt a staggered layout. When assembling with the mating parts, this layout forms an installation surface, making the motor and mating parts more stable. At the same time, the support feet adopt a stepped layout. The inner section is used to contact and fix the installation surface of the mating parts, and the lead-out section is used for positioning guidance during installation and lateral limiting after installation. The strength after assembly and fixing can be further enhanced by adding welding, making the motor and mating parts more stable.

[0018] (3) The inner section of the support leg and the protruding surface of the terminal block are kept at a sufficient distance so that after the mating part is assembled with the inner section of the support leg, a supporting effect is generated, preventing it from continuing to shift downward. The supporting surface formed by the inner section is located at the front end of the enameled wire segment, preventing the enameled wire segment at the bottom of the terminal block from being damaged by collision and avoiding quality risks.

[0019] (4) The motor shaft and the magnetic ring are integrally formed. The middle section of the magnetic ring adopts a circular groove design to remove some materials, reduce the rotational inertia of the motor shaft, reduce magnetic interference, and further make the motor shaft more stable during operation, with less impact during operation, thus further ensuring the stability of the assembly. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a perspective view of the small stepper motor of this utility model;

[0022] Figure 2 This is a left view of the small stepper motor of this utility model;

[0023] Figure 3 This is a front view of the small stepper motor of this utility model;

[0024] Figure 4 This is an assembly drawing of the mounting plate and connecting parts of the small stepper motor of this utility model;

[0025] Figure 5 This is an exploded view of the small stepper motor of this utility model;

[0026] Figure 6 This is a front view of the stator assembly of the small stepper motor of this utility model;

[0027] Figure 7 This is a top view of the stator assembly of the small stepper motor of this utility model;

[0028] Figure 8 This is a cross-sectional view of the small stepper motor of this utility model.

[0029] In the diagram: housing assembly 1, upper housing 11, lower housing 12, mounting plate 13, positioning support 131, outer support section 1311, inner support section 1312, positioning notch 14, stator assembly 2, terminal block 21, enameled wire section 211, first coil frame 22, second coil frame 23, first terminal block retainer 24, second terminal block retainer 25, support foot 26, inner section 261, lead-out section 262, rotor assembly 3, motor shaft 31, magnetic ring 32, circular groove 321, first magnetic ring 322, second magnetic ring 323, first bearing 4, second bearing 5, pole claw 6. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0031] Example 1

[0032] like Figures 1-3 As shown, a small stepper motor includes a housing assembly 1, a stator assembly 2, and a rotor assembly 3. The housing assembly 1 includes an upper housing 11 and a lower housing 12 symmetrically arranged, and a mounting plate 13 mounted on the outer surface of the upper housing 11 and / or the lower housing 12. The upper housing 11 and the lower housing 12 are connected to form a receiving cavity for accommodating the stator assembly 2. The rotor assembly 3 is sleeved inside the stator assembly 2, and the rotor assembly 3 is provided with a motor shaft 31 extending out of the upper housing 11. The receiving cavity has a positioning notch 14 at the connection between the upper housing 11 and the lower housing 12. The stator assembly 2 includes a terminal 21 extending out of the positioning notch 14 in the radial direction of the motor shaft 31. The mounting plate 13 is provided with a positioning support part 131, which forms a limiting structure after the terminal 21 is inserted into the mating part. The motor and the docking part are initially fixed by plugging in the terminal block 21 and then snapping it into place by the positioning support part 131 on the mounting plate 13. This improves the stability of the assembly between the motor and the docking part and allows for direct assembly without the need for additional screws.

[0033] The mounting plate 13 can be set on the upper surface of the upper housing 11 alone, or on the lower surface of the lower housing 12 alone, or both at the same time. In this embodiment, two mounting plates 13 are preferably set and symmetrically arranged so that the sides of the two positioning support parts 131 form a support surface parallel to the axial direction of the motor shaft 31. With this layout, after the motor and the docking parts are installed, in addition to being more stable, it is also more conducive to improving the parallelism and concentricity between the motor shaft 31 and the docking parts, which helps to reduce mechanical resistance and torque loss and improve the output torque of the whole machine mechanism. Moreover, the mounting plates 13 are located at the top and bottom of the motor respectively. This layout can better match the customer's docking parts, and the force points are balanced on both sides of the motor, making the motor and docking parts more stable after assembly.

[0034] like Figure 4 As shown, the positioning support 131 includes: an outer support section 1311 located in the middle and protruding, and inner support sections 1312 symmetrically distributed on both sides of the outer support section 1311. The inner support section 1312 is used to mate with the surface of the mating part, and the outer support section 1311 is used to engage with the slot of the mating part, making the installation simple and effectively stable. The outer support section 1311 and the inner support section 1312 form two support surfaces for matching with the mating part. Compared with a single support surface, multi-point support can be formed, making the installation more stable. It can be directly fitted during assembly without the need for additional screws for fastening.

[0035] like Figure 5 and Figure 6 As shown, the stator assembly 2 further includes: a first coil frame 22 and a second coil frame 23 fixedly connected vertically; the upper surface of the first coil frame 22 is fitted to the inner surface of the upper housing 11; the lower surface of the second coil frame 23 is fitted to the inner surface of the lower housing 12; a first terminal block holder 24 is provided at the lower edge of the first coil frame 22; a second terminal block holder 25 is provided at the upper edge of the second coil frame 23; two terminals 21 fixed to the first terminal block holder 24 and two terminals 21 fixed to the second terminal block holder 25 are located on the same horizontal plane. The first terminal block holder 24 and the second terminal block holder 25 are mirror images of each other, and the protruding part of the first terminal block holder 24 engages with the recessed part of the second terminal block holder 25, making the structure relatively compact.

[0036] like Figure 7 As shown, both the first terminal block retainer 24 and the second terminal block retainer 25 are provided with support feet 26 on the side away from the terminal block 21. By providing support feet 26, further assembly and positioning with the mating parts can be achieved, reducing the risk of increased assembly gaps between components.

[0037] The two support feet 26 are located on different planes and have a stepped structure. The two support feet 26 are staggered. When they are assembled with the mating parts, this layout forms an installation surface, which transforms line contact into surface contact, balances the stress points, prevents unilateral tilting after assembly, and ensures stable installation.

[0038] In this embodiment, the support foot 26 includes an inner section 261; the side of the inner section 261 closest to the terminal 21 is arc-shaped; an enameled wire segment 211 is provided on the terminal 21; the arc-shaped cut surface of the inner section 261 is located on the outer side of the enameled wire segment 211. The inner section 261 maintains a sufficient distance from the protruding surface of the terminal 21, so that after the mating part is assembled with the inner section 261 of the support foot 26, it provides support and prevents the part from shifting downwards. Furthermore, the arc-shaped cut surface of the inner section 261 is located at the front end of the enameled wire segment 211, preventing the enameled wire segment 211 at the bottom of the terminal 21 from being damaged by collision, thus avoiding quality risks.

[0039] In this embodiment, the support foot 26 further includes an extension section 262 extending radially from the inner section 261 along the motor shaft 31; the extension section 262 is suitable for insertion into the mating component. The support foot 26 adopts a stepped layout. The inner section 261 is used for contact and fixed support with the mounting surface of the mating component, and the extension section 262 is used for positioning guidance during installation and lateral limiting after installation. The extension section 262 can also adjust its extension length and size, making it convenient for customers to use after being fitted with the mating component. It can achieve the grounding function by adding welding or wiring, without the need for additional parts to achieve the grounding function, thus reducing production costs.

[0040] like Figure 8 As shown, the rotor assembly 3 also includes: a magnetic ring 32 integrally formed with the motor shaft 31; the magnetic ring 32 is sleeved on the outside of the motor shaft 31; the magnetic ring 32 includes: a circular groove 321 located in the middle, and a first magnetic ring 322 and a second magnetic ring 323 respectively corresponding to the first coil frame 21 and the second coil frame 22. The integral formation of the motor shaft 31 and the magnetic ring 32 strengthens the overall strength of the magnetic ring 32, avoids the risk of damage to the magnetic ring 32, and maintains the integrity and continuity of the entire magnetic circuit. The circular groove 321 in the middle of the magnetic ring 32 reduces the weight of the magnetic ring 32 without affecting the overall performance, reduces the rotational inertia of the motor shaft 31, reduces magnetic interference and internal resistance of the motor, and further reduces the back electromotive force interference and self-positioning torque of the motor. To a certain extent, while increasing torque and expanding the response frequency range, it also reduces motor vibration and improves sound quality.

[0041] The magnetic field interaction between the rotor assembly 3 and the coils on the first coil frame 22 and the second coil frame 23 after being energized mainly occurs between the upper and lower coils and between the magnetic field and the upper and lower pole claws 6. The middle section of the magnetic ring 32 will instead form local interference. The interference of excess magnetic field lines and the excess magnetic resistance between the middle pole plate and other metal parts can also be reduced by the design of the middle section circular groove 321, thereby improving the motor performance and response frequency and reducing electromagnetic noise.

[0042] In this embodiment, a middle electrode plate is provided between the first coil frame 21 and the second coil frame 22. The pole claws 6 extending upward along the inside of the middle electrode plate are alternately engaged with the pole claws 6 provided on the inner surface of the upper housing 11. The pole claws 6 extending downward along the inside of the middle electrode plate are alternately engaged with the pole claws 6 provided on the inner surface of the lower housing 12. This structure is prior art and will not be described in detail in this embodiment.

[0043] In this embodiment, a first bearing 4 is embedded in the mounting plate 13 located on the upper surface of the upper housing 11; a second bearing 5 is embedded in the mounting plate 13 located on the lower surface of the lower housing 12; and the two ends of the motor shaft 31 are respectively engaged with the first bearing 4 and the second bearing 5. By setting the first bearing 4 and the second bearing 5, the motor shaft 31 is limited to prevent positional displacement caused by long-term rotation of the motor shaft 31.

[0044] In summary, the small stepper motor of this utility model achieves initial fixation by inserting the terminal block 21 into the mating part, and then engages with the mating part through the positioning support part 131 on the mounting plate 13, which improves the stability of the motor and the mating part assembly. Furthermore, it can be directly assembled without the need for additional screws. The support foot 26 further enables positioning and assembly with the mating part, reducing the risk of increased assembly gaps between components. The support foot 26 adopts a stepped layout; the inner section 261 is used for contact and fixation support with the mounting surface of the mating part, while the lead-out section 262 is used for positioning guidance during installation and lateral limiting after installation. The lead-out section 262 can also be adjusted in length and size to match the mating part. After installation, it is easy for customers to use, and the grounding function can be achieved by adding welding or wiring. There is no need to add extra parts to achieve the grounding function, thus reducing production costs. The motor shaft 31 and the magnetic ring 32 are integrally formed, which strengthens the overall strength of the magnetic ring 32, avoids the risk of damage to the magnetic ring 32, and maintains the integrity and continuity of the entire magnetic circuit. A circular groove 321 is opened in the middle of the magnetic ring 32, which reduces the weight of the magnetic ring 32 without affecting the overall performance, reduces the rotational inertia of the motor shaft 31, reduces magnetic interference and internal resistance of the motor, and further reduces the back electromotive force interference and self-positioning torque of the motor. To a certain extent, while increasing torque and expanding the response frequency range, it also reduces motor vibration and improves sound quality.

[0045] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A small stepper motor, comprising a housing assembly (1), a stator assembly (2), and a rotor assembly (3); the housing assembly (1) comprising: The upper housing (11) and lower housing (12) are symmetrically arranged; the upper housing (11) and lower housing (12) are connected to form a cavity for accommodating the stator assembly (2); the rotor assembly (3) is sleeved inside the stator assembly (2), and the rotor assembly (3) is provided with a motor shaft (31) extending out of the upper housing (11); characterized in that, The housing assembly (1) further includes: a mounting plate (13) installed on the outer surface of the upper housing (11) and / or the lower housing (12); The receiving cavity has a positioning notch (14) at the connection between the upper housing (11) and the lower housing (12); The stator assembly (2) includes a terminal (21) extending from a positioning notch (14) in the radial direction along the motor shaft (31); The mounting plate (13) is provided with a positioning support (131), which forms a limiting structure after the terminal block (21) is inserted into the docking part.

2. The small stepper motor according to claim 1, characterized in that, There are two mounting plates (13), which are respectively set on the upper surface of the upper housing (11) and the lower surface of the lower housing (12); The two mounting plates (13) are symmetrically arranged so that the sides of the two positioning supports (131) form a support surface parallel to the axial direction of the motor shaft (31).

3. The small stepper motor according to claim 2, characterized in that, The positioning support (131) includes: an outer support section (1311) located in the middle and protruding, and inner support sections (1312) symmetrically distributed on both sides of the outer support section (1311).

4. The small stepper motor according to claim 2, characterized in that, The stator assembly (2) further includes: a first coil frame (22) and a second coil frame (23) fixedly connected at the top and bottom; The upper surface of the first coil frame (22) is fitted to the inner surface of the upper housing (11); The lower surface of the second coil frame (23) is fitted to the inner surface of the lower housing (12); A first terminal block holder (24) is provided at the lower edge of the first coil frame (22); A second terminal block holder (25) is provided at the upper edge of the second coil frame (23); The two terminals (21) embedded in the first terminal holder (24) and the two terminals (21) embedded in the second terminal holder (25) are located on the same horizontal plane.

5. The small stepper motor according to claim 4, characterized in that, Both the first terminal block holder (24) and the second terminal block holder (25) are provided with support feet (26) on the side away from the terminal block (21).

6. The small stepper motor according to claim 5, characterized in that, The two support feet (26) are located on different planes and have a stepped structure.

7. The small stepper motor according to claim 5, characterized in that, The support leg (26) includes an inner section (261); The inner section (261) is arc-shaped on the side near the terminal (21); The terminal block (21) is provided with an enameled wire segment (211); The arc-shaped section of the inner segment (261) is located outside the enameled wire segment (211).

8. The small stepper motor according to claim 7, characterized in that, The support foot (26) also includes an extension section (262) extending radially along the motor shaft (31) from the inner side section (261); The lead-out section (262) is suitable for insertion into the mating parts.

9. The small stepper motor according to claim 4, characterized in that, The rotor assembly (3) further includes a magnetic ring (32) integrally formed with the motor shaft (31); The magnetic ring (32) is sleeved on the outside of the motor shaft (31); The magnetic ring (32) includes: a circular groove (321) located in the middle, and a first magnetic ring (322) and a second magnetic ring (323) respectively corresponding to the first coil frame (21) and the second coil frame (22).

10. The small stepper motor according to claim 9, characterized in that, A first bearing (4) is embedded in a mounting plate (13) located on the upper surface of the upper housing (11); A second bearing (5) is embedded in the mounting plate (13) located on the lower surface of the lower housing (12); The two ends of the motor shaft (31) are respectively engaged with the first bearing (4) and the second bearing (5).

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