Stepping motor

Abstract

The stepping motor comprises a rotating shaft, a magnetic ring, a bearing, a plurality of varnished wires, an intermediate plate group, a housing and a cover plate, a through hole is formed in the magnetic ring in a penetrating manner, a glue groove is formed in one end of the magnetic ring and surrounds the through hole, the rotating shaft is arranged in the through hole in a penetrating manner, and a gap is formed between the rotating shaft and the inner side wall of the through hole. Glue is injected into the gap from the glue groove so as to bond and fix the rotating shaft and the magnetic ring; the intermediate plate group is fixedly arranged in the shell, the magnetic ring is arranged in the intermediate plate group in a penetrating manner, the plurality of enameled wires are arranged on the intermediate plate group, the cover plates are fixedly arranged at two ends of the shell, the bearings are arranged on the cover plates, and two ends of the rotating shaft are mounted with the bearings and penetrate out of the shell. The utility model has the advantages that the rotating shaft and the magnetic ring are bonded and fixed through glue, the fixation is firm, the structure is simple, and the assembly is convenient.

Description

Technical Field

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

[0002] A stepper motor is an electromechanical device that directly converts electrical pulses into mechanical motion. By controlling the sequence, frequency, and number of electrical pulses applied to the motor coils, the direction, speed, and rotation angle of the stepper motor can be controlled. Precise position and speed control can be achieved using a simple and low-cost open-loop control system composed of a stepper motor and its matching driver, without relying on a closed-loop feedback control system with position sensing. Based on external control pulses and direction signals, the stepper motor driver, through its internal logic circuitry, controls the stepper motor windings to be energized in a specific timing sequence, either forward or reverse, causing the motor to rotate forward / reverse or lock.

[0003] In existing stepper motors, the shaft and magnetic ring are usually molded as a single piece using injection molding. However, fixing the shaft and magnetic ring together using injection molding results in the disadvantage that the shaft and magnetic ring cannot be disassembled and replaced, making production inconvenient; moreover, when the magnetic ring is damaged, it is not possible to retain the shaft for continued use and replace the magnetic ring separately. Utility Model Content

[0004] The purpose of this invention is to provide a stepper motor in which the shaft and the magnetic ring are firmly fixed together, and the structure is simple, which can improve assembly efficiency.

[0005] This utility model discloses a stepper motor, including a rotating shaft, a magnetic ring, a bearing, several enameled wires, an intermediate plate assembly, a housing, and a cover plate. A through hole is formed in the magnetic ring, and a glue groove is formed at one end of the magnetic ring, surrounding the through hole. The rotating shaft passes through the through hole, forming a gap between the rotating shaft and the inner wall of the through hole. Glue is injected into the gap from the glue groove to bond and fix the rotating shaft to the magnetic ring. The intermediate plate assembly is fixedly disposed within the housing, and the magnetic ring passes through the intermediate plate assembly. Several enameled wires are disposed on the intermediate plate assembly. The cover plate is fixedly disposed at both ends of the housing, and the bearings are disposed on the cover plate. The two ends of the rotating shaft are installed with the bearings and pass through the housing.

[0006] Preferably, the glue tank is funnel-shaped, and the through hole is located at the center of the glue tank.

[0007] Preferably, the outer casing includes an upper casing and a lower casing, the intermediate plate assembly includes an upper intermediate plate and a lower intermediate plate, the upper casing and the lower casing are provided with abutment platforms, and a mounting groove is formed between the abutment platforms in the upper casing and the lower casing. The periphery of the upper intermediate plate and the periphery of the lower intermediate plate are embedded in the mounting groove. Two enameled wires are provided, and the two enameled wires are respectively installed between the upper casing and the upper intermediate plate, and between the lower casing and the lower intermediate plate.

[0008] Preferably, a first through hole is formed at the center of the surface of both the upper and lower housings, and a first insert plate is vertically arranged along the periphery of the first through hole; a second through hole is formed at the center of the surface of both the upper and lower intermediate plates, and a second insert plate is vertically arranged along the periphery of the second through hole; the second insert plate of the upper intermediate plate is engaged with the first insert plate of the upper housing, and the second insert plate of the lower intermediate plate is engaged with the first insert plate of the lower housing.

[0009] Preferably, a fixing plate is provided on one side of the upper intermediate plate and the lower intermediate plate, and a fixing groove is formed on the same side of the upper housing and the lower housing, and the fixing plate is embedded in the fixing groove.

[0010] Preferably, the surface of the lower intermediate plate is provided with a plurality of protrusions, and the surface of the upper intermediate plate is provided with a plurality of locking holes, wherein the protrusions are fitted into the locking holes.

[0011] Preferably, the cover plate is fixed to the upper housing and the lower housing by laser welding.

[0012] Preferably, the cover plate includes an upper cover and a lower cover, and an extension platform is provided on one side of the upper cover.

[0013] Preferably, the width of one side of the gap is set to "L" and satisfies 0.005mm. <L<0.015mm。

[0014] Preferably, a gear is fixedly mounted on the rotating shaft.

[0015] As can be seen from the above description of this utility model, this utility model has the following beneficial effects:

[0016] 1. A through hole is formed in the magnetic ring, the size of which is slightly larger than the diameter of the rotating shaft, and a glue groove is formed on the surface of the magnetic ring. After the rotating shaft is inserted into the through hole of the magnetic ring, the rotating shaft and the magnetic ring are glued together. This not only provides a firm fixation but also simplifies the manufacturing process. Furthermore, the rotating shaft and the magnetic ring are independent of each other, allowing for more efficient mass production.

[0017] 2. A first through hole is formed at the center of the surface of both the upper and lower housings, and a first insert plate is formed vertically along the periphery of the first through hole; a second through hole is formed at the center of the surface of both the upper and lower intermediate plates, and a second insert plate is formed vertically along the periphery of the second through hole; the second insert plate of the upper intermediate plate is engaged with the first insert plate of the upper housing, and the second insert plate of the lower intermediate plate is engaged with the first insert plate of the lower housing; thereby ensuring a stable installation between the upper housing and the upper intermediate plate, and between the lower housing and the lower intermediate plate.

[0018] 3. The cover plate is fixed to the upper and lower housings by laser welding. This not only ensures that the cover plate is firmly fixed to the upper and lower housings, but also that the welding is tight, resulting in no air holes between the upper and lower housings. The heating and cooling speeds during laser welding are extremely fast, the heat-affected zone is small, and the welding stress and deformation are minimal. Attached Figure Description

[0019] Figure 1 This is a front view of a stepper motor according to an embodiment;

[0020] Figure 2 This is a schematic diagram of the mounting slot in the embodiment;

[0021] Figure 3 This is a schematic diagram of the structure of the abutment platform and the first through hole in the embodiment;

[0022] Figure 4 This is a schematic diagram of the upper and lower intermediate plates in the embodiment;

[0023] Figure 5 This is a cross-sectional view of a stepper motor according to an embodiment;

[0024] Figure 6 This is a schematic diagram of the installation of the intermediate board and the lower housing in the embodiment;

[0025] Figure 7 This is a schematic diagram of the fixing groove in the embodiment;

[0026] Figure 8 This is a schematic diagram of the structure of the shaft, magnetic ring, and bearing in the embodiment;

[0027] Figure 9 This is a schematic diagram of the structure of the glue groove and gap in the embodiment;

[0028] Figure 10 This is a schematic diagram of the through hole structure in the embodiment;

[0029] Figure 11 This is a schematic diagram of the structure of the extended platform of the embodiment.

[0030] Reference numerals: 1. Shaft; 11. Gear; 2. Magnetic ring; 21. Through hole; 22. Glue groove; 23. Gap; 3. Bearing; 4. Enamelled wire; 5. Outer shell; 51. Upper shell; 52. Lower shell; 53. Abutment platform; 54. Mounting groove; 55. First through hole; 56. First insert plate; 57. Fixing groove; 6. Intermediate plate assembly; 61. Upper intermediate plate; 611. Snap hole; 62. Lower intermediate plate; 621. Protrusion; 63. Second through hole; 64. Second insert plate; 65. Fixing plate; 7. Cover plate; 71. Upper cover; 72. Lower cover; 73. Extension platform. Detailed Implementation

[0031] To make the technical problem to be solved, the technical solution and the beneficial effects of this utility model clearer and more understandable, the following description is provided in conjunction with the appendix. Figure 1-11 The present invention will be further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0032] Reference Figure 1 , Figure 2 and Figure 3 A stepper motor includes a shaft 1, a magnetic ring 2, two bearings 3, two enameled wires 4, a housing 5, an intermediate plate assembly 6, and a cover plate 7. The magnetic ring 2, the enameled wires 4, and the intermediate plate assembly 6 are all disposed within the housing 5. The housing 5 includes an upper housing 51 and a lower housing 52. The intermediate plate assembly 6 includes an upper intermediate plate 61 and a lower intermediate plate 62. Abutment platforms 53 are formed along the inner sidewalls of both the upper housing 51 and the lower housing 52. The upper intermediate plate 61 is installed into the upper housing 51, such that its periphery abuts against the abutment platforms 53 of the upper housing 51. The lower intermediate plate 62 is installed into the lower housing 52, such that its periphery abuts against the abutment platforms 53 of the lower housing 52. After the upper housing 51 and the lower housing 52 are installed together, an installation groove 54 is formed between the abutment platform 53 of the upper housing 51 and the abutment platform 53 of the lower housing 52.

[0033] Reference Figures 3-6 To prevent relative rotation between the upper intermediate plate 61 and the upper housing 51, and between the lower intermediate plate 62 and the lower housing 52, a first through hole 55 is formed at the center of the surface of the upper housing 51 and the lower housing 52. A plurality of first insert plates 56 are vertically arranged around the periphery of the first through hole 55, and the plurality of first insert plates 56 are evenly distributed along the periphery of the first through hole 55. Two enameled wires 4 are placed in the upper housing 51 and the lower housing 52 respectively, so that the enameled wires 4 are embedded between the first insert plates 56 and the inner wall of the housing.

[0034] Correspondingly, a second through hole 63 is formed at the center of the surface of the upper intermediate plate 61 and the lower intermediate plate 62, and a second insert plate 64 is vertically arranged along the periphery of the second through hole 63. The plurality of second insert plates 64 are evenly distributed along the periphery of the second through hole 63, and the width of the second insert plate 64 is equal to the spacing between two adjacent first insert plates 56. After the upper intermediate plate 61 is installed into the upper housing 51, the second insert plates 64 on the upper intermediate plate 61 are fitted between two adjacent first insert plates 56 on the upper housing 51; after the lower intermediate plate 62 is installed into the lower housing 52, the second insert plates 64 on the lower intermediate plate 62 are fitted between two adjacent first insert plates 56 on the lower housing 52. Thus, the two enameled wires 4 are respectively installed between the upper intermediate plate 61 and the upper housing 51, and between the lower intermediate plate 62 and the lower housing 52.

[0035] Reference Figure 3 and Figure 7 To further ensure the secure installation of the upper intermediate plate 61 on the upper housing 51 and the lower intermediate plate 62 on the lower housing 52, a fixing plate 65 is provided on one side of each plate. Correspondingly, a fixing groove 57 is formed on the same side of both the upper and lower housings 51 and 52. When the upper and lower housings 51 are installed together, the fixing groove 57 on the upper housing 51 and the fixing groove 57 on the lower housing 52 are connected. The fixing plate 65 on the upper intermediate plate 61 is then engaged with the fixing groove 57 on the upper housing 51, and the fixing plate 65 on the lower intermediate plate 62 is engaged with the fixing groove 57 on the lower housing 52.

[0036] Reference Figure 4 Subsequently, the upper housing 51 and the lower housing 52 are fixedly installed using laser welding, so that the surface of the upper intermediate plate 61 abuts against the surface of the lower intermediate plate 62. In order to ensure accurate positioning and installation between the upper intermediate plate 61 and the lower intermediate plate 62, a number of protrusions 621 are provided on the surface of the lower intermediate plate 62, and correspondingly, a number of locking holes 611 are formed on the surface of the upper intermediate plate 61. During installation, the protrusions 621 on the surface of the lower intermediate plate 62 are engaged into the locking holes 611 on the surface of the upper intermediate plate 61.

[0037] Reference Figure 5 , Figure 8 , Figure 9 and Figure 10, for the installation of the magnetic ring 2, a through hole 21 is formed at the center of the surface of the magnetic ring 2. The formed through hole 21 is set to be circular, and the diameter dimension of the formed through hole 21 is made larger than the diameter dimension of the rotating shaft 1. The rotating shaft 1 is inserted into the through hole 21 of the magnetic ring 2, so that a gap 23 is formed between the rotating shaft 1 and the inner side wall of the through hole 21 of the magnetic ring 2. The single-side width dimension of the gap 23 is set to be "L", and the single-side width dimension of the gap 23 is made to satisfy 0.005mm < L < 0.015mm. A glue groove 22 is formed on the surface of the magnetic ring 2. The formed glue groove 22 is funnel-shaped, and the through hole 21 is located at the center of the formed glue groove 22. After pouring glue into the glue groove 22, the glue flows into the gap 23 between the rotating shaft 1 and the magnetic ring 2 to bond and fix the rotating shaft 1 and the magnetic ring 2. The glue used is an epoxy resin structural adhesive. The epoxy resin structural adhesive has high bonding strength, can ensure the stable connection between the magnetic ring 2 and the rotating shaft 1, and has the advantage of rapid curing without other assistance. And the rotating shaft 1 and the magnetic ring 2 are bonded and fixed with glue, so that the rotating shaft 1 and the magnetic ring 2 are assembled and fixed. Compared with the original integral injection molding between the rotating shaft 1 and the magnetic ring 2, separating the rotating shaft 1 and the magnetic ring 2 for separate production has the advantage of higher production efficiency.

[0038] Figure 1 and Figure 11 , the cover plate 7 is set to include an upper cover plate 71 and a lower cover plate 72. The two bearings 3 are respectively fixedly arranged at the centers of the upper cover plate 71 and the lower cover plate 72. The lower cover plate 72 is arranged at the bottom end of the lower housing 52, and the lower cover plate 72 and the lower housing 52 are fixed by bolt locking. Fixing the lower cover plate 72 and the lower housing 52 by bolt locking is not only firmly fixed but also has the advantage of convenient disassembly. Subsequently, the magnetic ring 2 is inserted into the first through hole 55 of the housing and the second through hole 63 of the intermediate plate group 6, so that one end of the rotating shaft 1 is installed with the bearing 3 and penetrates out of the lower housing 52. The upper cover plate 71 is covered on the top end of the upper housing 51, so that the other end of the rotating shaft 1 penetrates through the bearing 3 and is installed with the bearing 3. Subsequently, the upper cover plate 71 and the upper housing 51 are fixed by bolt locking. In addition, an extension platform 73 is extended on one side of the upper cover 71. The setting of the extension platform 73 facilitates the installation and disassembly of the upper cover 71.

[0039] A gear 11 is fixedly arranged at one end of the rotating shaft 1 that penetrates out of the upper housing body.The setting of the gear 11 can increase the torque of the stepping motor, so as to be able to drive a larger load and at the same time reduce the speed of the motor. Secondly, it can also help to match the required pulse equivalent; by adjusting the gear ratio of the gear 11, the movement distance and speed of the motor can be accurately controlled to meet specific control requirements. In addition, the setting of the gear 11 can also reduce the inertia ratio between the load and the motor, reduce the vibration and resonance of the stepping motor, and improve the stability and precision of the motor.

[0040] The specific implementation principle of this application embodiment is as follows: When assembling the stepper motor, the rotating shaft 1 is inserted into the through hole 21 of the magnetic ring 2, forming a gap 23 between the rotating shaft 1 and the inner wall of the through hole 21 of the magnetic ring 2. Epoxy resin structural adhesive is injected into the adhesive groove 22 on the surface of the magnetic ring 2, so that the epoxy resin structural adhesive fills the gap 23 between the rotating shaft 1 and the inner wall of the through hole 21, thereby bonding and fixing the rotating shaft 1 and the magnetic ring 2. Compared with the original integral injection molding of the rotating shaft 1 and the magnetic ring 2, the bonding and fixing method between the rotating shaft 1 and the magnetic ring 2 allows for assembly and disassembly, and the independent production of the rotating shaft 1 and the magnetic ring 2 also has higher production efficiency.

[0041] Two enameled wires 4 are installed into the upper housing 51 and the lower housing 52 respectively, and the first insert plate 56 is inserted into the enameled wire 4 to position the installation of the enameled wire 4. Then, the upper intermediate plate 61 is installed into the upper housing 51 and the lower intermediate plate 62 is installed into the lower housing 52 respectively. The upper intermediate plate 61 abuts against the abutment platform 53 of the upper housing 51, and the lower intermediate plate 62 abuts against the abutment platform 53 of the lower housing 52. The second locking plate 64 on the upper intermediate plate 61 engages with the first locking plate 56 on the upper housing 51, and the second locking plate 64 on the lower intermediate plate 62 engages with the first locking plate 56 on the lower housing 52. The fixing plate 65 on the upper intermediate plate 61 is engaged in the fixing groove 57 of the upper housing 51, and the fixing plate 65 on the lower intermediate plate 62 is engaged in the fixing groove 57 of the lower housing 52. The upper housing 51 and lower housing 52 are fixedly installed using laser welding, so that the protrusion 621 on the surface of the lower intermediate plate 62 engages in the locking hole 611 on the surface of the upper intermediate plate 61, facilitating the positioning and installation of the upper housing 51 and lower housing 52.

[0042] Two bearings 3 are fixed at the center of the upper cover 71 and the lower cover 72 respectively. The lower cover 72 is installed at the bottom of the lower housing 52 and fixed with bolts. The magnetic ring 2 is inserted into the upper housing 51 and the lower housing 52, and one end of the rotating shaft 1 is installed with the bearing 3 of the lower cover 72 and passes through the lower housing 52. The upper cover 71 is installed at the top of the upper housing 51 and fixed with bolts. The other end of the rotating shaft 1 is installed with the bearing 3 on the upper cover 71 and passes through the upper housing 51. Thus, the assembly of the stepper motor is completed.

[0043] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution to other situations without modification, shall be protected by the present invention.

Claims

1. A stepper motor, characterized in that: The device includes a rotating shaft, a magnetic ring, a bearing, several enameled wires, an intermediate board assembly, a housing, and a cover plate. A through hole is formed in the magnetic ring, and a glue groove is formed at one end of the magnetic ring, which surrounds the through hole. The rotating shaft passes through the through hole, and a gap is formed between the rotating shaft and the inner wall of the through hole. Glue is injected into the gap from the glue groove to bond and fix the rotating shaft and the magnetic ring together. The intermediate plate assembly is fixedly installed inside the outer casing. The magnetic ring passes through the intermediate plate assembly. Several enameled wires are installed on the intermediate plate assembly. The cover plate is fixedly installed at both ends of the outer casing. The bearing is installed on the cover plate. The two ends of the rotating shaft are installed with the bearing and pass through the outer casing.

2. A stepper motor according to claim 1, characterized in that: The glue tank is funnel-shaped, and the through hole is located at the center of the glue tank.

3. A stepper motor according to claim 1, characterized in that: The outer casing includes an upper casing and a lower casing, and the intermediate plate assembly includes an upper intermediate plate and a lower intermediate plate. Abutment platforms are formed within the upper and lower casings, and a mounting groove is formed between the abutment platforms in the upper and lower casings. The periphery of the upper and lower intermediate plates is fitted into the mounting groove. Two enameled wires are provided, and the two enameled wires are respectively installed between the upper casing and the upper intermediate plate, and between the lower casing and the lower intermediate plate.

4. A stepper motor according to claim 3, characterized in that: A first through hole is formed at the center of the surface of both the upper and lower housings, and a first insert plate is formed vertically along the periphery of the first through hole; a second through hole is formed at the center of the surface of both the upper and lower intermediate plates, and a second insert plate is formed vertically along the periphery of the second through hole; the second insert plate of the upper intermediate plate is engaged with the first insert plate of the upper housing, and the second insert plate of the lower intermediate plate is engaged with the first insert plate of the lower housing.

5. A stepper motor according to claim 4, characterized in that: A fixing plate is provided on one side of the upper intermediate plate and the lower intermediate plate, and a fixing groove is formed on the same side of the upper housing and the lower housing, and the fixing plate is embedded in the fixing groove.

6. A stepper motor according to claim 3, characterized in that: The surface of the lower intermediate plate is provided with several protrusions, and the surface of the upper intermediate plate is provided with several locking holes, and the protrusions are locked into the locking holes.

7. A stepper motor according to claim 3, characterized in that: The cover plate is fixed to the upper and lower housings by laser welding.

8. A stepper motor according to claim 7, characterized in that: The cover plate includes an upper cover and a lower cover, and an extension platform is provided on one side of the upper cover.

9. A stepper motor according to claim 1, characterized in that: The width of the gap on one side is set to "L" and must be 0.005mm. <L<0.015mm。 10. A stepper motor according to claim 1, characterized in that: A gear is fixedly mounted on the rotating shaft.

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