Stepper motor capable of controlling axial displacement
Patent Information
- Application Number
- CN202522139373.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-10
- Publication Date
- 2026-09-11
- Estimated Expiration
- 2035-10-10
AI Technical Summary
而现有能够解决轴承的轴向间隙是采用锁紧螺母结构对轴承增加预载力消除轴向位移间隙，但是这样导致轴承在大预载力下降低轴承运行寿命进一步的增加端盖零件加工制造成本
[0013]本实用新型的有益效果：通过设置磁力外壳、转轴、轴承、轴用止动圈和前端盖用止动圈；磁力外壳为两端开口的中空的结构，是为了能够形成容纳空间；转轴为中字型杆状结构，且转轴的一端贯穿磁力外壳的一端位于磁力外壳的另一端的内部，这样设置能够产生磁力；为了能够承受载荷所以设置了轴承，轴承设置在套设在转轴上；轴用止动圈为两端开口的圆柱体结构，轴用止动圈套设在转轴上，与轴承的一端抵接，且轴用止动圈与转轴之间过盈配合；前端盖用止动圈为两端开口的圆柱体结构，前端盖用止动圈与磁力外壳的内周壁连接，与轴承的另一端抵接，且前端盖用止动圈与磁力外壳的内周壁之间过盈配合，设置轴用止动圈是为了限制轴承轴向位移，设置前端盖用止动圈是为了轴向固定轴承，防止其从磁力外壳内脱出，并且，轴用止动圈与转轴之间过盈配合和前端盖用止动圈与磁力外壳的内周壁之间过盈配合，通过这样的设置，能够使轴承底部面与转轴台阶端面作为支撑面，让轴承两端的端面通过前端盖止动圈与轴用止动圈固定，从而让轴承无任何承载力，使轴承的使用寿命增加。
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Figure CN224746371U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of motor technology, and in particular to a stepper motor capable of controlling axial displacement. Background Technology
[0002] The core function of a stepper motor is to achieve precise positioning through step-by-step rotation using pulse signals, requiring far more zero backlash than ordinary motors. The axial clearance of the bearing, specifically the tiny space for movement between the inner and outer rings along the motor's axis, directly compromises the stepper motor's core performance. Current methods to address axial clearance involve using a locking nut structure to increase preload and eliminate axial displacement clearance. However, this reduces bearing lifespan under high preload and further increases the manufacturing cost of the end cap components. Utility Model Content
[0003] In view of this, this application proposes a stepper motor capable of controlling axial displacement, including a magnetic housing, a rotating shaft, a bearing, a shaft retaining ring, and a front cover retaining ring; the magnetic housing is a hollow structure with openings at both ends; the rotating shaft is a U-shaped rod structure, with one end of the rotating shaft penetrating through one end of the magnetic housing and located inside the other end of the magnetic housing; the bearing is mounted on the rotating shaft; the shaft retaining ring is a cylindrical structure with openings at both ends, mounted on the rotating shaft, abutting against one end of the bearing, and the shaft retaining ring and the rotating shaft are interference-fitted; the front cover retaining ring is a cylindrical structure with openings at both ends, connected to the inner peripheral wall of the magnetic housing, abutting against the other end of the bearing, and the front cover retaining ring and the inner peripheral wall of the magnetic housing are interference-fitted.
[0004] In one possible implementation, the magnetic housing includes a front cover, a rear cover, a stator core, a rotor core, and a magnet; the front cover is a convex cylindrical structure with a first through hole; the rear cover is a cylindrical structure with a second through hole, and the front cover and the rear cover are arranged opposite to each other; the stator core is a hollow cylindrical structure with openings at both ends, and the stator core is disposed between the front cover and the rear cover; the rotating shaft vertically penetrates the front cover and the stator core, and is located inside the second through hole; the rotor core is a cylindrical structure with openings at both ends, and the rotor core is sleeved on the rotating shaft; the magnet is a cylindrical structure with openings at both ends, the magnet is sleeved on the rotating shaft, and the magnet is connected to the rotor core.
[0005] In one possible implementation, the bearing includes a front bearing and a rear bearing, the front bearing being disposed inside the first through hole and the rear bearing being disposed inside the second through hole.
[0006] In one possible implementation, the rotating shaft includes a first body, a second body, and a third body. The first body is disposed at one end of the second body, and the third body is disposed at the other end of the second body. The diameter of the first body is smaller than the diameter of the second body, and the diameter of the third body is equal to the diameter of the first body. A front bearing is sleeved on the first body, and the other end of the front bearing is located at the connection between the first body and the second body. A rear bearing is disposed on the third body, and one end of the rear bearing is located at the connection between the third body and the second body.
[0007] In one possible implementation, one end of the front cover retaining ring is connected to the other end of the front bearing, the other end of the front cover is connected to the rotor core, the outer peripheral wall of the front cover is connected to the inner peripheral wall of the first through hole, and there is a preset distance between the inner peripheral wall of the front cover retaining ring and the first body; one end of the shaft retaining ring abuts against one end of the front bearing.
[0008] In one possible implementation, the rotor core includes a first rotor core and a second rotor core, both of which are disposed on the second body, located between the front end cover and the rear end cover, and there is a preset distance between the first rotor core and the second rotor core.
[0009] In one possible implementation, the magnet is disposed between the first rotor core and the second rotor core.
[0010] In one possible implementation, the other end of the first body extends a predetermined distance outward from the front end cover.
[0011] In one possible implementation, both the first through hole and the second through hole shown are convex structures.
[0012] In one possible implementation, there is a preset distance between the inner peripheral wall of the magnet and the second body, and a preset distance between the outer peripheral wall of the magnet and the inner peripheral wall of the stator core.
[0013] The beneficial effects of this utility model are as follows: By setting up a magnetic shell, a rotating shaft, a bearing, a shaft retaining ring, and a front cover retaining ring; the magnetic shell is a hollow structure with openings at both ends to form an accommodating space; the rotating shaft is a U-shaped rod structure, with one end of the rotating shaft penetrating through the magnetic shell and the other end located inside the magnetic shell, this arrangement can generate magnetic force; a bearing is provided to withstand the load, and the bearing is fitted onto the rotating shaft; the shaft retaining ring is a cylindrical structure with openings at both ends, fitted onto the rotating shaft, abutting against one end of the bearing, and there is an interference fit between the shaft retaining ring and the rotating shaft; the front cover retaining ring is a cylindrical structure with openings at both ends. The front cover uses a retaining ring to connect to the inner circumferential wall of the magnetic housing and abuts against the other end of the bearing. The front cover retaining ring and the inner circumferential wall of the magnetic housing have an interference fit. The shaft retaining ring is used to limit the axial displacement of the bearing, while the front cover retaining ring is used to axially fix the bearing and prevent it from coming out of the magnetic housing. Furthermore, the interference fit between the shaft retaining ring and the rotating shaft, and the interference fit between the front cover retaining ring and the inner circumferential wall of the magnetic housing, allows the bottom surface of the bearing and the stepped end face of the rotating shaft to serve as support surfaces. The end faces of both ends of the bearing are fixed by the front cover retaining ring and the shaft retaining ring, thus eliminating any load on the bearing and increasing its service life. Attached Figure Description
[0014] Figure 1 This diagram illustrates the specific structure of a stepper motor capable of controlling axial displacement according to an embodiment of this application. Detailed Implementation
[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.
[0016] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.
[0017] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model or simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0018] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0019] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," "fixing," "linking," and "hinged" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0020] like Figure 1As shown, the stepper motor capable of controlling axial displacement includes a magnetic housing, a rotating shaft 400, a bearing 500, a shaft retaining ring 800, and a front cover retaining ring 900. The magnetic housing is a hollow structure with openings at both ends. The rotating shaft 400 is a U-shaped rod structure, with one end of the rotating shaft 400 penetrating through one end of the magnetic housing and located inside the other end of the magnetic housing. The bearing 500 is mounted on the rotating shaft 400. The shaft retaining ring 800 is a cylindrical structure with openings at both ends, mounted on the rotating shaft 400, and abutting against one end of the bearing 500, with an interference fit between the shaft retaining ring 800 and the rotating shaft 400. The front cover retaining ring 900 is a cylindrical structure with openings at both ends, connected to the inner circumferential wall of the magnetic housing, and abutting against the other end of the bearing 500, with an interference fit between the front cover retaining ring 900 and the inner circumferential wall of the magnetic housing. It should be noted that the magnetic housing includes a front cover 100, a rear cover 200, a stator core 300, a rotor core 600, and a magnet 700. The front cover 100 is a convex cylindrical structure with a first through hole; the rear cover 200 is a cylindrical structure with a second through hole, and the front cover 100 and the rear cover 200 are positioned opposite each other; the stator core 300 is a hollow cylindrical structure with openings at both ends, and is positioned between the front cover 100 and the rear cover 200; the rotating shaft 400 vertically penetrates the front cover 100 and the stator core 300, and is located inside the second through hole; the rotor core 600 is a cylindrical structure with openings at both ends, and is mounted on the rotating shaft 400; the magnet 700 is a cylindrical structure with openings at both ends, is mounted on the rotating shaft, and is connected to the rotor core 600.
[0021] Specifically, such as Figure 1 As shown, the specific components of a stepper motor capable of controlling axial displacement include a front cover 100, a rear cover 200, a stator core 300, a shaft 400, a bearing 500, a rotor core 600, a magnet 700, a shaft retaining ring 800, and a front cover retaining ring 900. The front cover 100 is a convex cylindrical structure, and the rear cover 200 is a cylindrical structure. A first through hole is formed in the front cover 100, and a second through hole is formed in the rear cover 200. Figure 1It can be seen that both the first and second through holes are convex-shaped through holes, with the larger diameter ends of the first and second through holes facing each other. The stator core 300 is a hollow cylindrical structure with open ends. The stator core 300 is located between the front end cover 100 and the rear end cover 200, and the hollow structure with open ends of the stator core 300 is connected to the first and second through holes. This arrangement allows the rotating shaft 400 to pass through the first through hole, the stator core 300, and the second through hole. In order to bear the load... Under load, a bearing 500 is provided. The bearing 500 is a hollow cylindrical structure with holes at both ends. The bearing 500 is sleeved on the rotating shaft 400. In order to generate magnetic force and electromagnetic torque and to make the overall structure more complete, a rotor core 600 and a magnet 700 are provided. Both the rotor core 600 and the magnet 700 are hollow cylindrical structures with holes at both ends, and are sleeved on the rotating shaft 400. The rotor core 600, stator core 500 and magnet 700 cooperate to make the rotating shaft 400 rotate, so that the overall structure can work.
[0022] In one possible implementation, bearing 500 includes a front bearing 510 and a rear bearing 520. The front bearing 510 is disposed inside a first through hole, and the rear bearing 520 is disposed inside a second through hole. Shaft 400 includes a first body 410, a second body 420, and a third body 430. The first body 410 is disposed at one end of the second body 420, and the third body 430 is disposed at the other end of the second body 420. The diameter of the first body 410 is smaller than the diameter of the second body 420, and the diameter of the third body 430 is equal to the diameter of the first body 410. The front bearing 510 is sleeved on the first body 410, and its other end is located at the connection between the first body 410 and the second body 420. The rear bearing 520 is disposed on the third body 430, and one end of the rear bearing 520 is located at the connection between the third body 430 and the second body 420. One end of the front cover retaining ring 800 is connected to the other end of the front bearing 510, and the other end of the front cover 510 is connected to the rotor core 600. The outer peripheral wall of the front cover 510 is connected to the inner peripheral wall of the first through hole, and there is a preset distance between the inner peripheral wall of the front cover retaining ring 800 and the first body.
[0023] Specifically, such as Figure 1 As shown, there are two bearings 500, namely a front bearing 510 and a rear bearing 520. The rotating shaft 400 includes a first body 410, a second body 420, and a third body 430. The first body 410 is located at one end of the second body 420. Figure 1It can be seen that the overall structure of the rotating shaft 400 is U-shaped, meaning that the diameters of the first main body 410 and the third main body 430 are both smaller than the diameter of the second main body 420. This arrangement allows a shaft step to be formed at the connection between the first main body 410 and the second main body 420. More specifically, the front bearing 510 is mounted on the first main body 410, and one end of the front bearing 510 abuts against the shaft step. To prevent displacement of the rotating shaft, a shaft retaining ring 800 and a front cover retaining ring 900 are also provided. The shaft retaining ring 800 is a hollow cylinder with open ends, and it is fitted onto the first main body 410. In this configuration, one end of the shaft retaining ring 800 abuts against one end of the front bearing 510. The front cover retaining ring 900 is also a hollow cylindrical structure with openings at both ends. One end of the front cover retaining ring 900 abuts against the other end of the front bearing 510. Furthermore, the inner circumferential wall of the shaft retaining ring 800 is interference-fitted with the rotating shaft 400, and the outer circumferential wall of the front cover retaining ring 900 is interference-fitted with the inner circumferential wall of the first through hole. This configuration allows the bottom surface of the bearing and the end face of the rotating shaft step to serve as support surfaces, fixing the end faces of both bearing ends to the front cover retaining ring and the shaft retaining ring, thus eliminating any load on the bearing and increasing its service life. More specifically, the rear bearing 520 is positioned within the second through hole, with one end abutting against the shaft step formed between the dead body 420 and the third body 430.
[0024] More specific structures, such as Figure 1 As shown, the rotor core 600 includes a first rotor core 610 and a second rotor core 620. Both the first rotor core 610 and the second rotor core 620 are disposed on the second body 420, located between the front end cover 100 and the rear end cover 200, and there is a predetermined distance between the first rotor core 610 and the second rotor core 620. A magnet 700 is disposed between the first rotor core 610 and the second rotor core 620. There is a predetermined distance between the inner peripheral wall of the magnet 700 and the second body 420, and a predetermined distance between the outer peripheral wall of the magnet 700 and the inner peripheral wall of the stator core 30. This arrangement is to allow for better contact between the magnet 700 and the first rotor core 610 and the second rotor core 620, thereby better generating electromagnetic torque.
[0025] In one possible implementation, the other end of the first body 410 extends outward from the front cover 100 by a predetermined distance. This arrangement makes the overall structure more complete and facilitates connection with external devices.
[0026] This application, through the above-mentioned configuration, enables the bottom surface of the bearing and the end face of the shaft step to serve as support surfaces, allowing the end faces of both ends of the bearing to be fixed to the shaft retaining ring via the front cover retaining ring. This eliminates any load on the bearing, increasing its service life. It solves the technical problem that the traditional end cover purchase and locking nut structure increases the preload on the bearing to eliminate axial displacement clearance, resulting in a reduction in bearing service life under high preload.
[0027] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope disclosed in the present utility model, based on the technical solution and concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A stepper motor capable of controlling axial displacement, characterized in that, Includes magnetic housing, shaft, bearing, shaft retaining ring, and front cover retaining ring; The magnetic outer shell is a hollow structure with openings at both ends; The rotating shaft is a rod-shaped structure with one end penetrating through the magnetic housing and the other end located inside the magnetic housing. The bearing is mounted on the rotating shaft; The shaft retaining ring is a cylindrical structure with open ends. The shaft retaining ring is sleeved on the rotating shaft and abuts against one end of the bearing. The shaft retaining ring and the rotating shaft are interference-fitted. The front cover retaining ring is a cylindrical structure with openings at both ends. The front cover retaining ring is connected to the inner peripheral wall of the magnetic housing and abuts against the other end of the bearing. The front cover retaining ring and the inner peripheral wall of the magnetic housing are interference-fitted.
2. The stepper motor capable of controlling axial displacement according to claim 1, characterized in that, The magnetic housing includes a front cover, a rear cover, a stator core, a rotor core, and magnets; The front end cover has a convex cylindrical structure, and a first through hole is provided on the front end cover; The rear end cover is a cylindrical structure, and a second through hole is provided on the rear end cover. The front end cover and the rear end cover are arranged opposite to each other. The stator core is a hollow cylindrical structure with openings at both ends, and the stator core is disposed between the front end cover and the rear end cover; The rotating shaft vertically penetrates the front end cover and the stator core, and is located inside the second through hole; The rotor core is a cylindrical structure with openings at both ends, and the rotor core is sleeved on the rotating shaft. The magnet is a cylindrical structure with openings at both ends. The magnet is sleeved on the rotating shaft and connected to the rotor core.
3. The stepper motor capable of controlling axial displacement according to claim 2, characterized in that, The bearing includes a front bearing and a rear bearing, the front bearing being disposed inside the first through hole and the rear bearing being disposed inside the second through hole.
4. The stepper motor capable of controlling axial displacement according to claim 3, characterized in that, The rotating shaft includes a first body, a second body, and a third body. The first body is disposed at one end of the second body, and the third body is disposed at the other end of the second body. The diameter of the first body is smaller than the diameter of the second body, and the diameter of the third body is equal to the diameter of the first body. The front bearing is sleeved on the first body, and the other end of the front bearing is located at the connection between the first body and the second body; The rear bearing is mounted on the third body, and one end of the rear bearing is located at the connection between the third body and the second body.
5. The stepper motor capable of controlling axial displacement according to claim 4, characterized in that, One end of the front cover is connected to the other end of the front bearing with a stop ring, the other end of the front cover is connected to the rotor core, the outer peripheral wall of the front cover is connected to the inner peripheral wall of the first through hole, and there is a preset distance between the inner peripheral wall of the front cover and the first body. One end of the shaft retaining ring abuts against one end of the front bearing.
6. The stepper motor capable of controlling axial displacement according to claim 5, characterized in that, The rotor core includes a first rotor core and a second rotor core. Both the first rotor core and the second rotor core are disposed on the second main body, located between the front end cover and the rear end cover, and there is a preset distance between the first rotor core and the second rotor core.
7. The stepper motor capable of controlling axial displacement according to claim 6, characterized in that, The magnet is disposed between the first rotor core and the second rotor core.
8. The stepper motor capable of controlling axial displacement according to claim 7, characterized in that, The other end of the first main body extends a predetermined distance outward from the front end cover.
9. The stepper motor capable of controlling axial displacement according to claim 8, characterized in that, The first through hole and the second through hole shown are both convex structures.
10. The stepper motor capable of controlling axial displacement according to claim 6, characterized in that, There is a preset distance between the inner peripheral wall of the magnet and the second main body, and there is a preset distance between the outer peripheral wall of the magnet and the inner peripheral wall of the stator core.