High-coaxiality connecting structure of a reduction stepper motor and reduction stepper motor

Abstract

The utility model discloses a kind of high coaxiality connection structure of reduction stepping motor, including reduction gearbox and annular stator assembly, limit part is equipped on reduction gearbox, limit part is arranged around the axial direction of reduction gearbox, limit part and the inner hole wall of stator assembly are inserted and matched. By being provided with limit part on reduction gearbox, limit part and the inner hole wall of stator assembly are inserted and matched, to limit the relative position of reduction gearbox and stator assembly, improve the coaxiality of stator assembly and reduction gearbox inner gear ring, and then make the coaxiality of rotor assembly and reduction gearbox first stage planetary tooth be guaranteed, transmission efficiency is improved, transmission process is more stable, it is favorable to reduce vibration, reduce noise.

Description

Technical Field

[0001] This utility model relates to the field of motor equipment technology, and in particular to a high coaxiality connection structure for a speed-reduced stepper motor and a speed-reduced stepper motor. Background Technology

[0002] Commercially available claw-pole stepper motors, which convert electrical pulses into angular displacement actuators, mainly consist of a claw-pole stator assembly and a rotor assembly. An external drive circuit controls them to perform the intended work. The rotor assembly is a magnetic ring with N and S poles, while the stator assembly is made of soft magnetic material through stamping. Two winding coils are installed on the stator assembly. When the windings are energized, the magnetic conductor generates N and S pole magnetic fields, changing the excitation mode of the windings. The magnetic pole surfaces of the soft magnetic material continuously change from N to S, attracting and repelling the N and S pole magnetic rings in a regular manner, thus causing the windings to rotate as intended on the shaft.

[0003] Miniature motors are small in size, have high speeds, and low output power, and are rarely used alone. They need to be paired with a gearbox with a suitable speed ratio to reduce the output speed and increase the output torque. Ensuring the coaxiality of the motor body and the first-stage planetary gears of the gearbox is particularly important, and the key to ensuring this coaxiality lies in the transition connection method between the motor body and the gearbox. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a high coaxiality connection structure for a decelerated stepper motor and a decelerated stepper motor having the high coaxiality connection structure.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a high coaxiality connection structure for a decelerated stepper motor, including a deceleration box and an annular stator assembly. The deceleration box is provided with a limiting part, which is arranged around the axial direction of the deceleration box and is inserted into the inner wall of the stator assembly.

[0006] Furthermore, the limiting part includes multiple protrusions, which abut against the inner wall of the stator assembly.

[0007] Furthermore, the limiting part is annular, and the outer wall surface of the limiting part abuts against the inner wall of the stator assembly.

[0008] The second technical solution adopted by this utility model is: a decelerated stepper motor, including a rotor assembly, a housing, and the aforementioned high coaxiality connection structure of the decelerated stepper motor. The gearbox is fixedly connected to the housing, the stator assembly is located inside the housing, the rotor assembly is rotatably installed inside the stator assembly, and the rotor assembly is provided with a drive gear, which is connected to the gearbox for transmission.

[0009] Furthermore, the gearbox includes a gearbox body and a connecting seat. The connecting seat is connected to the gearbox body, the rotor assembly passes through the connecting seat, and the connecting seat is provided with a limiting part.

[0010] Furthermore, the connecting seat is connected to the gearbox body by screws, clips, or welding.

[0011] Furthermore, it also includes a front bearing and a rear bearing. The front bearing is located on the connecting seat, and the rear bearing is located on the stator assembly. The front bearing and the rear bearing are respectively inserted into the rotor assembly.

[0012] Furthermore, the gearbox and housing are provided with riveting bosses and riveting holes that mate with the riveting bosses.

[0013] Furthermore, the gearbox is screwed to the housing.

[0014] Furthermore, it also includes connectors that are electrically connected to the stator assembly.

[0015] The beneficial effects of this utility model are as follows: by setting a limiting part on the gearbox, the limiting part is inserted and matched with the inner wall of the stator assembly, thereby limiting the relative position of the gearbox and the stator assembly, improving the coaxiality of the stator assembly and the gear ring inside the gearbox, and thus ensuring the coaxiality of the rotor assembly and the first stage planetary gear of the gearbox, improving the transmission efficiency, making the transmission process smoother, and helping to reduce vibration and noise. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the speed-reducing stepper motor according to Embodiment 1 of this utility model;

[0017] Figure 2 This is a partial structural cross-sectional view of the speed-reducing stepper motor of Embodiment 1 of this utility model (with connectors and wires hidden).

[0018] Figure 3 This is an exploded view of part of the structure of the speed-reducing stepper motor of Embodiment 1 of this utility model (with connectors and wires hidden).

[0019] Label Explanation:

[0020] 1. Gearbox; 11. Gearbox body; 12. Connecting seat; 121. Limiting part; 122. Riveting hole;

[0021] 2. Stator assembly;

[0022] 3. Rotor assembly; 31. Drive gear;

[0023] 4. Outer shell; 41. Riveting boss;

[0024] 5. Front bearing;

[0025] 6. Rear bearing;

[0026] 7. Connectors. Detailed Implementation

[0027] To explain in detail the technical content, objectives, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0028] Please refer to Figures 1 to 3 A high coaxiality connection structure for a speed-reduced stepper motor includes a speed reduction gearbox 1 and an annular stator assembly 2. The speed reduction gearbox 1 is provided with a limiting part 121, which is arranged axially around the speed reduction gearbox 1 and is inserted into the inner wall of the stator assembly 2.

[0029] As can be seen from the above description, the beneficial effects of this utility model are as follows: by setting a limiting part 121 on the gearbox 1, the limiting part 121 is inserted and engaged with the inner wall of the stator assembly 2, thereby limiting the relative position of the gearbox 1 and the stator assembly 2, improving the coaxiality of the stator assembly 2 and the inner gear ring of the gearbox 1, and thus ensuring the coaxiality of the rotor assembly 3 and the first stage planetary gear of the gearbox 1, improving the transmission efficiency, making the transmission process smoother, and helping to reduce vibration and noise.

[0030] Furthermore, the limiting part 121 includes a plurality of protrusions, which respectively abut against the inner wall of the stator assembly 2.

[0031] As can be seen from the above description, the limiting part 121 composed of multiple protrusions can reduce the amount of material used, thereby reducing the weight of the speed reduction stepper motor.

[0032] Furthermore, the limiting part 121 is annular, and the outer wall surface of the limiting part 121 abuts against the inner wall of the stator assembly 2.

[0033] As can be seen from the above description, the annular limiting part 121 has a large structural strength and is not easily deformed under stress, which is beneficial to ensuring the coaxiality of the gearbox 1 and the stator assembly 2.

[0034] The geared stepper motor includes a rotor assembly 3, a housing 4, and the aforementioned high coaxiality connection structure for the geared stepper motor. The gearbox 1 is fixedly connected to the housing 4. The stator assembly 2 is located inside the housing 4. The rotor assembly 3 is rotatably installed inside the stator assembly 2. The rotor assembly 3 is provided with a drive gear 31, which is connected to the gearbox 1 in a transmission manner.

[0035] As described above, the speed-reducing stepper motor is engaged with the inner wall of the stator assembly 2 through the limiting part 121, thereby limiting the relative position of the speed reducer 1 and the stator assembly 2, improving the coaxiality of the inner gear ring of the stator assembly 2 and the speed reducer 1, and thus ensuring the coaxiality of the rotor assembly 3 and the first stage planetary gear of the speed reducer 1.

[0036] Furthermore, the gearbox 1 includes a gearbox body 11 and a connecting seat 12. The connecting seat 12 is connected to the gearbox body 11, and the rotor assembly 3 passes through the connecting seat 12. The connecting seat 12 is provided with a limiting part 121.

[0037] As can be seen from the above description, the end of the rotor assembly 3 can pass through the connecting seat 12 and then connect to the drive gear 31, which facilitates the assembly of the rotor assembly 3, the drive gear 31 and the gearbox body 11.

[0038] Furthermore, the connecting seat 12 is connected to the gearbox body 11 by screws, clips, or welding.

[0039] As can be seen from the above description, the connection method between the connecting seat 12 and the gearbox body 11 can be selected according to actual usage needs or production conditions.

[0040] Furthermore, it also includes a front bearing 5 and a rear bearing 6. The front bearing 5 is located on the connecting seat 12, and the rear bearing 6 is located on the stator assembly 2. The front bearing 5 and the rear bearing 6 are respectively inserted into the rotor assembly 3.

[0041] As can be seen from the above description, the front bearing 5 and the rear bearing 6 can reduce the coefficient of friction between the rotor assembly 3 and other components, thereby reducing energy loss.

[0042] Furthermore, the gearbox 1 and the outer casing 4 are provided with a riveting boss 41 and a riveting hole 122 that mates with the riveting boss 41.

[0043] As can be seen from the above description, the connection between the gearbox 1 and the outer casing 4 is simple, which helps to save parts and improve assembly efficiency.

[0044] Furthermore, the gearbox 1 is connected to the housing 4 by screws.

[0045] As can be seen from the above description, the connection between the gearbox 1 and the outer casing 4 is stable and not easily separated.

[0046] Furthermore, it also includes connector 7, which is electrically connected to stator assembly 2.

[0047] As described above, the geared stepper motor can be electrically connected to an external power supply or control device via connector 7.

[0048] Please refer to Figures 1 to 3Embodiment 1 of this utility model is a speed-reduced stepper motor, including a rotor assembly 3, a housing 4, and a high coaxiality connection structure for the speed-reduced stepper motor. The high coaxiality connection structure includes a reduction gearbox 1 and an annular stator assembly 2. The reduction gearbox 1 is provided with a limiting part 121, which is arranged axially around the reduction gearbox 1 and is inserted into the inner wall of the stator assembly 2. The reduction gearbox 1 is fixedly connected to the housing 4, the stator assembly 2 is disposed inside the housing 4, and the rotor assembly 3 is rotatably installed inside the stator assembly 2. The rotor assembly 3 is provided with a drive gear 31, which is connected to the reduction gearbox 1 for transmission. The stator assembly 2 includes a frame, pins, and enameled wire. The frame is integrally injection molded from four claw pole pieces. The pins are fixed to the end of the frame away from the reduction gearbox 1, and the enameled wire is wound around the frame.

[0049] In this embodiment, the limiting part 121 includes a plurality of fan-shaped protrusions, the axial direction of which is collinear with the axial direction of the gearbox 1, and the plurality of protrusions respectively abut against the inner wall of the stator assembly 2. In other embodiments, the limiting part 121 is annular, the axial direction of the limiting part 121 is collinear with the axial direction of the gearbox 1, and the outer wall surface of the limiting part 121 abuts against the inner wall of the stator assembly 2, which is also feasible.

[0050] The gearbox 1 includes a gearbox body 11 and a connecting seat 12. The connecting seat 12 is connected to the gearbox body 11, and the rotor assembly 3 passes through the connecting seat 12. The connecting seat 12 is provided with a limiting part 121. Specifically, the connecting seat 12 is screwed to the gearbox body 11. The outer periphery of the connecting seat 12 is provided with multiple threaded holes, and the peripheral wall of the gearbox body 11 is provided with multiple through holes for the screws to pass through. The connecting seat 12 is used to open and close the inner cavity of the gearbox body 11, and the inner cavity of the gearbox body 11 is provided with multi-stage transmission gears. In other embodiments, it is also feasible for the connecting seat 12 to be snap-fitted to the gearbox body 11 or welded.

[0051] In this embodiment, the outer casing 4 is provided with a plurality of annular riveting bosses 41, and the connecting seat 12 is provided with a plurality of riveting holes 122 that mate with the riveting bosses 41. In other embodiments, the riveting bosses 41 may be provided with other shapes, including but not limited to solid cylindrical or prismatic shapes; it is also feasible for the connecting seat 12 to be provided with a plurality of riveting bosses 41 and for the outer casing 4 to be provided with a plurality of riveting holes 122 that mate with the riveting bosses 41; it is also feasible for the gearbox 1 to be connected to the outer casing 4 with screws.

[0052] In order to enable the rotor assembly 3 to rotate more smoothly, the speed reduction stepper motor also includes a front bearing 5 and a rear bearing 6. The front bearing 5 is located on the connecting seat 12 of the speed reduction box 1, and the rear bearing 6 is located on the stator assembly 2. The front bearing 5 and the rear bearing 6 are respectively inserted into the rotor assembly 3.

[0053] The geared stepper motor also includes a connector 7, which is electrically connected to the stator assembly 2 via wires. The geared stepper motor can be electrically connected to an external power supply or control device via the connector 7.

[0054] In summary, the high coaxiality connection structure of the decelerated stepper motor provided by this utility model limits the relative position of the deceleration box and the stator assembly by setting a limiting part on the deceleration box and allowing the limiting part to be inserted into the inner wall of the stator assembly, thereby improving the coaxiality of the stator assembly and the gear ring inside the deceleration box. This, in turn, ensures the coaxiality of the rotor assembly and the first stage planetary gear of the deceleration box, improves the transmission efficiency, makes the transmission process smoother, and helps to reduce vibration and noise.

[0055] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A high coaxiality connection structure for a speed-reduced stepper motor, comprising a gearbox and an annular stator assembly, characterized in that, The gearbox is provided with a limiting part, which is arranged around the axial direction of the gearbox and is inserted into the inner wall of the stator assembly.

2. The high coaxiality connection structure for a speed-reducing stepper motor according to claim 1, characterized in that, The limiting part includes a plurality of protrusions, each of which abuts against the inner wall of the stator assembly.

3. The high coaxiality connection structure for a speed-reducing stepper motor according to claim 1, characterized in that, The limiting part is annular, and the outer wall surface of the limiting part abuts against the inner wall of the stator assembly.

4. A speed-reducing stepper motor, characterized in that, The device includes a rotor assembly, a housing, and a high coaxiality connection structure for a speed-reduced stepper motor as described in any one of claims 1 to 3. The speed-reducing gearbox is fixedly connected to the housing, the stator assembly is disposed inside the housing, the rotor assembly is rotatably mounted inside the stator assembly, and the rotor assembly is provided with a drive gear, which is drivenly connected to the speed-reducing gearbox.

5. The speed-reducing stepper motor according to claim 4, characterized in that, The gearbox includes a gearbox body and a connecting seat. The connecting seat is connected to the gearbox body, the rotor assembly passes through the connecting seat, and the connecting seat is provided with the limiting part.

6. The speed-reducing stepper motor according to claim 5, characterized in that, The connecting seat is connected to the main body of the gearbox by screws, snap-fit ​​connections, or welding.

7. The speed-reducing stepper motor according to claim 5, characterized in that, It also includes a front bearing and a rear bearing, the front bearing being disposed on the connecting seat and the rear bearing being disposed on the stator assembly, and the front bearing and the rear bearing being respectively inserted into the rotor assembly.

8. The speed-reducing stepper motor according to claim 4, characterized in that, The gearbox and the outer casing are provided with riveting bosses and riveting holes that mate with the riveting bosses.

9. The speed-reducing stepper motor according to claim 4, characterized in that, The gearbox is screwed to the housing.

10. The speed-reducing stepper motor according to claim 4, characterized in that, It also includes a connector that is electrically connected to the stator assembly.

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