Stepping motor with pole piece connecting structure

Abstract

The utility model relates to the technical field of motors, in particular to a stepping motor with a magnetic pole piece connecting structure, which comprises a motor output shaft and a magnetic pole piece, the magnetic pole piece is provided with a mounting hole, the magnetic pole piece is sleeved on the motor output shaft through the mounting hole, the stepping motor further comprises a fixing piece, the fixing piece is connected with the magnetic pole piece, and the fixing piece is connected with the magnetic pole piece. And the fixing sheet is welded with the motor output shaft, so that the magnetic pole sheet and the motor output shaft move synchronously. According to the stepping motor with the magnetic pole piece connecting structure, the fixing pieces are additionally arranged on the magnetic pole pieces, the problem that the magnetic pole pieces cannot be directly welded to the output shaft of the motor is solved, the magnetic pole pieces rotate more stably under the condition that welding reliability is guaranteed, it is guaranteed that the magnetic pole pieces always keep plane concentric movement, and the situations of shaking and the like do not occur; and moreover, the welding mode is more reliable in fixation, the aging phenomenon is not easy to occur, the condition that the magnetic pole pieces fall off is not easy to occur, and the product quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a stepping motor with a pole piece connection structure. Background Art

[0002] A stepping motor is the power source in an electronic pen-type syringe, and a pole piece needs to be installed on the motor output shaft. However, during the manual installation process, due to the inability to accurately position the corresponding positions between the flat part on the motor output shaft and the pole piece, the hole positions will be damaged during the installation of the pole piece.

[0003] Refer to Figure 1 , in the existing solution, an adhesive bonding method is adopted to improve this problem, that is, the pole piece 4 to be installed is bonded to the motor shaft 5 with glue. However, the glue will age and fall off over time, causing the pole piece to rotate eccentrically and shake, resulting in motor noise or jamming. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is: to solve the technical problems in the existing technology, the utility model provides a stepping motor with a pole piece connection structure.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a stepping motor with a pole piece connection structure, including a motor output shaft and a pole piece. The pole piece is provided with an installation hole, and the pole piece is sleeved on the motor output shaft through the installation hole. It further includes a fixing piece, the fixing piece is connected to the pole piece, and the fixing piece is welded to the motor output shaft so that the pole piece and the motor output shaft move synchronously.

[0006] For the stepping motor with a pole piece connection structure of the utility model, a fixing piece is added to the pole piece, which solves the problem that the pole piece cannot be directly welded to the motor output shaft, and makes the rotation of the pole piece more stable while ensuring the welding reliability, ensuring that the pole piece always maintains planar concentric motion without shaking and other situations, and the fixing by welding is more reliable and not prone to aging phenomenon, and thus it is not easy to have the situation of the pole piece falling off, improving the quality of the product.

[0007] Further, the fixing piece is provided with a connection hole coaxial with the installation hole, the fixing piece is sleeved on the motor output shaft through the connection hole, and the inner wall of the connection hole is welded to the outer surface of the motor output shaft.

[0008] Further, the welding position of the fixing piece and the motor output shaft is located at one end of the fixing piece away from the pole piece.

[0009] Furthermore, an installation groove is provided on the side wall of the magnetic pole piece. The fixing piece is adapted to the installation groove, and at least a part of the fixing piece is located in the installation groove. The projection of the fixing piece along the axial direction of the installation hole is non-circular, so that the magnetic pole piece and the fixing piece move synchronously.

[0010] Furthermore, the thickness of the fixing piece is equal to the groove depth of the installation groove along the axial direction of the magnetic pole piece.

[0011] Furthermore, a fitting block is provided on the side wall of the fixing piece, and a fitting groove for inserting the fitting block is formed on the side wall of the magnetic pole piece. The fitting groove is adapted to the fitting block, and the fitting groove communicates with the installation groove.

[0012] Furthermore, a plurality of fitting blocks are provided along the circumferential direction of the fixing piece, and a plurality of fitting grooves are provided along the circumferential direction of the installation groove. The plurality of fitting blocks correspond to the plurality of fitting grooves one by one.

[0013] Furthermore, the surface of the fitting block away from the fixing piece is an arc surface.

[0014] Furthermore, a transition arc is provided at the junction of the fitting block and the fixing piece.

[0015] Furthermore, an installation flat position is provided on the motor output shaft. A limiting step is formed between the installation flat position and the motor output shaft. One end of the magnetic pole piece away from the fixing piece contacts the limiting step.

[0016] The beneficial effects of the present utility model are as follows:

[0017] 1. By adding a fixing piece to the magnetic pole piece, the problem that the magnetic pole piece cannot be directly welded to the motor output shaft is solved. While ensuring the welding reliability, the rotation of the magnetic pole piece is more stable, ensuring that the magnetic pole piece always maintains planar concentric motion without shaking or other situations, and the welding method is more reliable and not prone to aging, so it is not easy to have the situation of the magnetic pole piece falling off, improving the quality of the product;

[0018] 2. By providing an installation groove for the fixing piece to insert, the connection between the magnetic pole piece and the fixing piece is closer, and the axial force during rotation is smaller, so that the rotation of the magnetic pole piece is more stable;

[0019] 3. The structures of providing an arc surface on the fitting block and adopting a transition arc can both improve the fitting degree between the fixing piece and the magnetic pole piece, make the force between the fixing piece and the magnetic pole piece uniform, further improve the stability of the rotation of the magnetic pole piece, and reduce the possibility of shaking. Description of the Drawings

[0020] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0021] Figure 1 It is an exploded structural schematic diagram showing that the pole piece to be installed and the motor shaft are connected by glue in the background art.

[0022] Figure 2 It is an exploded structural schematic diagram showing the overall stepping motor with a pole piece connection structure in the present invention.

[0023] Figure 3 It is an exploded structural schematic diagram showing the connection structure between the pole piece and the fixing piece in the present invention.

[0024] Figure 4 It is a front view schematic diagram of the pole piece in the present invention.

[0025] Figure 5 It is a front view schematic diagram of the fixing piece in the present invention.

[0026] In the figure: 1, motor output shaft; 11, installation flat position; 12, limit step; 2, pole piece; 21, installation hole; 22, installation groove; 23, mating groove; 3, fixing piece; 31, connection hole; 32, mating block; 33, transition arc; 4, pole piece to be installed; 5, motor shaft. Detailed implementation manners

[0027] Now, the present invention will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only showing the basic structure of the present invention in a schematic way, so they only show the components related to the present invention. 2.00mm

[0028] Intentions, only showing the basic structure of the present invention in a schematic way, so they only show the components related to the present invention.

[0029] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise stated, the meaning of "a plurality" is two or more. In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0030] The present utility model discloses a stepping motor with a magnetic pole piece connection structure.

[0031] Referring to Figures 2 to 5 , a stepping motor with a magnetic pole piece connection structure includes a motor output shaft 1, a magnetic pole piece 2, and a fixing piece 3. The motor output shaft 1 has a mounting flat 11, and a limiting step 12 is formed between the mounting flat 11 and the motor output shaft 1. The magnetic pole piece 2 is provided with a mounting hole 21 adapted to the mounting flat 11. The fixing piece 3 has a connection hole 31 coaxial with the mounting hole 21, and the connection hole 31 is adapted to the mounting flat 11. The magnetic pole piece 2 is sleeved on the mounting flat 11 through the mounting hole 21, and the fixing piece 3 is sleeved on the mounting flat 11 through the connection hole 31. One end of the magnetic pole piece 2 contacts the limiting step 12, and the other end is connected to the fixing piece 3. The end of the fixing piece 3 away from the magnetic pole piece 2 is welded to the motor output shaft 1, and thus cooperates with the limiting step 12 to relatively fix the magnetic pole piece 2 along its own axis to the motor output shaft 1. At the same time, the fixing piece 3 can move synchronously with the motor output shaft 1, and thus the magnetic pole piece 2 moves synchronously with the motor output shaft 1.

[0032] Specifically, during welding, the inner wall of the connecting hole 31 is welded to the outer surface of the motor output shaft 1. The fixing piece 3 is made of a metal material capable of being welded to the motor output shaft 1, such as carbon steel, stainless steel, etc. By adding the fixing piece 3 to the pole piece 2 and then welding the fixing piece 3 to the motor output shaft 1, the problem that the pole piece 2 cannot be directly welded to the motor output shaft 1 is solved. The fixing piece 3 is connected to the pole piece 2, and it can drive the pole piece 2 to rotate synchronously and concentrically with the motor output shaft 1 while ensuring the welding reliability; moreover, compared with the method of bonding with glue, the welding method is more reliable in fixing, is not prone to aging, and thus is not easily prone to the situation of the pole piece 2 falling off, improving the quality of the product.

[0033] According to the connection structure between the motor output shaft 1 and the pole piece 2 in this embodiment, an installation groove 22 is formed on the side wall of the pole piece 2. The fixing piece 3 is adapted to the installation groove 22, and at least part of the fixing piece 3 is located in the installation groove 22. Preferably, the thickness of the fixing piece 3 is equal to the groove depth of the installation groove 22 along the axial direction of the pole piece 2, that is, when the fixing piece 3 is placed in the installation groove 22, the outer end face of the fixing piece 3 is flush with one end face of the pole piece 2. To facilitate the synchronous movement of the pole piece 2 and the fixing piece 3, the projection of the fixing piece 3 as a whole along the axial direction of the installation hole 21 is non-circular.

[0034] Specifically, a fitting block 32 is integrally formed on the side wall of the fixing piece 3. A fitting groove 23 for inserting the fitting block 32 is formed on the side wall of the pole piece 2. The fitting groove 23 is adapted to the fitting block 32, and the fitting groove 23 communicates with the installation groove 22. Through the cooperation of the fitting block 32 and the fitting groove 23, it is further convenient for the fixing piece 3 to drive the pole piece 2 to rotate synchronously.

[0035] Furthermore, a plurality of fitting blocks 32 are provided along the circumferential direction of the fixing piece 3, and a plurality of fitting grooves 23 are provided along the circumferential direction of the installation groove 22. The plurality of fitting blocks 32 and the plurality of fitting grooves 23 correspond to each other one by one to improve the tightness of the fit between the fixing block and the pole piece 2. Preferably, two fitting blocks 32 are provided and are arranged in a pair along the axis of the pole piece 2.

[0036] More specifically, the surface of the fitting block 32 away from the fixing piece 3 is an arc surface, so that the fixing piece 3 can better cooperate with the pole piece 2. A transition arc 33 is provided at the junction of the fitting block 32 and the fixing piece 3, so that the fitting block 32 and the fixing piece 3 are more closely and reliably fitted. The structures of providing an arc surface on the fitting block 32 and using the transition arc 33 can both improve the degree of fit between the fixing piece 3 and the pole piece 2, make the force between the fixing piece 3 and the pole piece 2 uniform, further improve the stability of the rotation of the pole piece 2, and reduce the possibility of shaking.

[0037] Optionally, the fixing piece 3 can also adopt a sheet-like structure with an elliptical or rectangular cross-section, as long as it can make the fixing piece 3 drive the pole piece 2 to rotate synchronously.

[0038] Working principle: During installation, the fixing piece 3 is placed into the installation groove 22, and the mating block 32 is located in the mating groove 23. Subsequently, the fixing piece 3 and the magnetic pole piece 2 are sleeved together on the motor output shaft 1, and then the fixing piece 3 is welded to the motor output shaft 1, solving the problem that the magnetic pole piece 2 cannot be directly welded to the motor output shaft 1. By connecting the fixing piece 3 with the magnetic pole piece 2, it can drive the magnetic pole piece 2 to rotate synchronously and concentrically with the motor output shaft 1 while ensuring the welding reliability; moreover, compared with the method of bonding with glue, the welding method is more reliable and not prone to aging, and thus it is not easy for the magnetic pole piece 2 to fall off, improving the product quality.

[0039] Taking the above ideal embodiment of the present utility model as an inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A stepper motor with a magnetic pole piece connection structure, comprising a motor output shaft (1) and a magnetic pole piece (2), wherein the magnetic pole piece (2) is provided with a mounting hole (21), and the magnetic pole piece (2) is sleeved on the motor output shaft (1) through the mounting hole (21), characterized in that: It also comprises a fixing plate (3), wherein the fixing plate (3) is connected to the magnetic pole plate (2), and the fixing plate (3) is welded to the motor output shaft (1), so that the magnetic pole plate (2) and the motor output shaft (1) move synchronously.

2. The stepper motor with a magnetic pole piece connection structure according to claim 1, characterized in that: The fixing plate (3) has a connecting hole (31) coaxial with the mounting hole (21); the fixing plate (3) is sleeved on the motor output shaft (1) through the connecting hole (31); and the inner wall of the connecting hole (31) is welded to the outer surface of the motor output shaft (1).

3. The stepper motor with a magnetic pole piece connection structure according to claim 2, characterized in that: The welding position of the fixing plate (3) and the motor output shaft (1) is located at an end of the fixing plate (3) away from the magnetic pole piece (2).

4. The stepper motor with a magnetic pole piece connection structure according to claim 2, characterized in that: A mounting groove (22) is provided on the side wall of the magnetic pole piece (2), the fixing plate (3) is matched with the mounting groove (22), and at least a portion of the fixing plate (3) is located in the mounting groove (22), and the axial projection of the fixing plate (3) along the mounting hole (21) is non-circular, so that the magnetic pole piece (2) and the fixing plate (3) move synchronously.

5. The stepper motor with a magnetic pole piece connection structure according to claim 4, characterized in that: The thickness of the fixing plate (3) is equal to the groove depth of the mounting groove (22) along the axial direction of the magnetic pole piece (2).

6. The stepper motor with a magnetic pole piece connection structure according to claim 4, characterized in that: A matching block (32) is provided on the side wall of the fixing plate (3), and a matching groove (23) for inserting the matching block (32) is provided on the side wall of the magnetic pole piece (2), the matching groove (23) is matched with the matching block (32), and the matching groove (23) is connected with the installation groove (22).

7. The stepper motor with a magnetic pole piece connection structure according to claim 6, characterized in that: A plurality of the matching blocks (32) are provided along the circumference of the fixing plate (3), and a plurality of the matching grooves (23) are provided along the circumference of the mounting groove (22). The plurality of matching blocks (32) correspond one to one with the plurality of matching grooves (23).

8. The stepper motor with a magnetic pole piece connection structure according to claim 6, characterized in that: A surface of the matching block (32) away from the fixing plate (3) is an arc-shaped surface.

9. The stepper motor with a magnetic pole piece connection structure according to claim 6, characterized in that: A transition arc (33) is provided at the junction of the matching block (32) and the fixing plate (3).

10. The stepper motor with a magnetic pole piece connection structure according to claim 1, characterized in that: The motor output shaft (1) has a mounting flat position (11), a limiting step (12) is formed between the mounting flat position (11) and the motor output shaft (1), and one end of the magnetic pole piece (2) away from the fixing piece (3) contacts the limiting step (12).

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