A self-positioning claw-pole type stepping motor and its assembly method

Abstract

The present invention discloses a self-positioning claw-pole type stepping motor, wherein the inner side areas of the housing claw pole, the middle and lower claw poles, the middle and upper claw poles, and the magnetic plate claw pole, which are opposite to the outer side surface of the rotor body, are equal, and the area ratio of the inner side area of the housing claw pole to the outer side area of the rotor body satisfies S1:S2≥0.22. By relatively increasing the inner side area of the housing claw pole, the excitation between the housing claw pole and the rotor body is effectively increased, the output power of the motor is improved, and in addition, it also has the characteristics of stable and reliable operation and high operation efficiency. An assembly method of the self-positioning claw-pole type stepping motor of the present invention can realize the automatic positioning assembly of the rotor body, and has the characteristics of fewer assembly steps and simple assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of stepper motors, and in particular to a self-positioning claw-pole type stepper motor and an assembly method thereof.

Background Art

[0002] With the development of the utilization technology of permanent magnet materials, especially rare earth materials with high magnetic energy product, it has greatly promoted the development of motor technology that replaces electric excitation with permanent magnet excitation. Thus, various permanent magnet motors with small volume, light weight, high efficiency and energy saving have emerged. Among them, the permanent magnet claw-pole stepper motor has the advantages of simple structure, small control power, and positioning torque function in the case of power-off because a permanent magnet is added to the rotor and the electromagnetic coil, carbon brush and slip ring structure are omitted, and it has been widely used in the fields of office automation and industrial automatic control.

[0003] However, at the present stage, the claw poles in the claw-pole type stepper motor are relatively small, resulting in poor excitation effect between the claw poles and the rotor body, and causing problems such as unstable operation and low operation efficiency of the motor; in addition, there is a large gap between the claw poles in the motor, so the magnetic leakage is also large, which will reduce the effective utilization rate of the air-gap magnetic flux to a certain extent, thus affecting the working efficiency of the motor.

[0004] Therefore, the present invention is studied and proposed in view of the above problems.

Summary of the Invention

[0005] The object of the present invention is to overcome the deficiencies of the prior art and provide a self-positioning claw-pole type stepper motor, which can improve the problems existing in the prior art and has the characteristics of stable and reliable operation and high operation efficiency.

[0006] The present invention is achieved by the following technical solutions:

[0007] A self - positioning claw - pole type stepping motor, comprising a rotor assembly and a stator assembly arranged outside the rotor assembly; the rotor assembly includes a rotor body 6; the stator assembly includes a housing 1 and a lower coil skeleton 2, an intermediate magnetic plate 3, an upper coil skeleton 4 and an upper magnetic plate 5 sequentially assembled in the housing 1. On the inner bottom of the housing 1, a plurality of housing claw - poles 11 extending towards the intermediate magnetic plate 3 are circumferentially spaced; on the upper magnetic plate 5, a plurality of magnetic - plate claw - poles 51 extending towards the intermediate magnetic plate 3 are circumferentially spaced. On the intermediate magnetic plate 3, a plurality of middle - lower claw - poles 31 and middle - upper claw - poles 32 are circumferentially spaced respectively towards the inner bottom of the housing 1 and the upper magnetic plate 5. And each of the middle - lower claw - poles 31 is misaligned with each of the housing claw - poles 11, and a lower space 12 for the middle - lower claw - poles 31 to enter is formed between adjacent two housing claw - poles 11, and a middle - lower space 311 for the housing claw - poles 11 to enter is formed between adjacent two middle - lower claw - poles 31; each of the middle - upper claw - poles 32 is misaligned with each of the magnetic - plate claw - poles 51, and a middle - upper space 321 for the magnetic - plate claw - poles 51 to enter is formed between adjacent two middle - upper claw - poles 32, and a magnetic - plate space 52 for the middle - upper claw - poles 32 to enter is formed between adjacent two magnetic - plate claw - poles 51; the areas of the inner sides of the housing claw - poles 11, middle - lower claw - poles 31, middle - upper claw - poles 32 and magnetic - plate claw - poles 51 that are opposite to the outer side of the rotor body 6 are equal, and the ratio of the area of the inner side of the housing claw - pole 11 to the area of the outer side of the rotor body 6 satisfies S1:S2≥0.22.

[0008] For a self - positioning claw - pole type stepping motor as described above, the circumferential gap between the housing claw - pole 11 and the middle - lower claw - pole 31 and / or the circumferential gap between the middle - upper claw - pole 32 and the magnetic - plate claw - pole 51 satisfies 0≤α≤0.5mm.

[0009] For a self - positioning claw - pole type stepping motor as described above, the circumferential gap between the housing claw - pole 11 and the middle - lower claw - pole 31 and / or the circumferential gap between the middle - upper claw - pole 32 and the magnetic - plate claw - pole 51 α = 0.32mm.

[0010] For a self - positioning claw - pole type stepping motor as described above, the number of the housing claw - poles 11, middle - lower claw - poles 31, middle - upper claw - poles 32 and magnetic - plate claw - poles 51 is equal and is an even number.

[0011] For a self - positioning claw - pole type stepping motor as described above, the area of the inner side of the housing claw - pole 11 satisfies S1≥5.68mm 2 .

[0012] For a self - positioning claw - pole type stepping motor as described above, the area S1 of the inner side of the housing claw - pole 11 is 8.5mm 2 .

[0013] In the self-positioning claw-pole stepping motor as described above, the housing claw pole 11 is narrow at the top and wide at the bottom, and the housing claw pole 11 has an upper width of 1.6-2 mm, a lower width of 2.6-3 mm, and a height of 3.6-4 mm.

[0014] In the self-positioning claw-pole stepping motor as described above, the housing claw pole 11 has an upper width of 1.9 mm, a lower width of 2.96 mm, and a height of 3.86 mm.

[0015] In the self-positioning claw-pole stepper motor as described above, a plurality of casing claw poles 11 on the inner bottom of the casing 1 form a circular installation space 13 for installing the rotor body 6, the inner diameter of the installation space 13 is 12 to 13 mm, and the outer diameter of the rotor body 6 is smaller than the inner diameter of the installation space 13.

[0016] In the self-positioning claw-pole stepping motor as described above, the rotor body 6 is made of ferrite injection molding.

[0017] The present invention provides an assembly method of a self-positioning claw-pole stepping motor, using the self-positioning claw-pole stepping motor as described above, wherein the outer diameter of the rotor body 6 is 12.2 mm, and comprises the following steps:

[0018] a. Assemble the stator assembly, assemble the lower coil frame 2, the middle magnetic plate 3, the upper coil frame 4 and the upper magnetic plate 5 in the housing 1 in sequence, the middle and lower claw poles 31 are staggered and engaged with the housing claw poles 11 so that the inner side walls of the middle and lower claw poles 31 and the housing claw poles 11 form a lower installation space, and the inner diameter of the lower installation space is 12.6 mm, the middle and upper claw poles 32 are staggered and engaged with the magnetic plate claw poles 51 so that the inner side walls of the middle and upper claw poles 32 and the magnetic plate claw poles 51 form an upper installation space that communicates with the lower installation space, and the inner diameter of the upper installation space is 12.6 mm;

[0019] b. Assemble the rotor body, place the rotor body 6 in the upper installation space and the lower installation space, and the gap difference between the outer wall of the rotor body 6 and the inner wall of the upper installation space is 0.4 mm. The inner walls of the upper installation space and the lower installation space limit the radial movement of the rotor body 6 relative to the casing 1, and the bottom wall of the casing 1 limits the axial downward movement of the rotor body 6 relative to the casing 1, thereby realizing the self-positioning assembly of the rotor body 6.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] 1. The inner side areas of the housing claw pole, the middle and lower claw poles, the upper and middle claw poles, and the magnetic plate claw pole of the present invention are equal to the inner side areas opposite to the outer side of the rotor body respectively, and the ratio of the inner side area of the housing claw pole to the outer side area of the rotor body satisfies S1:S2≥0.22. By relatively increasing the inner side area of the housing claw pole, the excitation between the housing claw pole and the rotor body is effectively increased, the output power of the motor is improved, and it also has the characteristics of stable and reliable operation and high operation efficiency.

[0022] 2. The circumferential gap between the housing claw pole and the middle and lower claw poles and / or the circumferential gap between the upper and middle claw poles and the magnetic plate claw pole satisfy 0≤α≤0.5mm, which is beneficial to reducing magnetic leakage and improving the working efficiency of the motor.

[0023] 3. The rotor body is made of ferrite material, which can reduce the manufacturing cost.

[0024] 4. An assembling method of a self-positioning claw pole type stepping motor of the present invention can realize the automatic positioning and assembling of the rotor body, has the characteristics of fewer assembling steps and simple assembling, and in addition, the stepping motor assembled by the assembling method of the present invention has the characteristics of stable and reliable operation and high operation efficiency.

Description of the Drawings

[0025] The following further details the specific embodiments of the present invention with reference to the drawings, where:

[0026] Figure 1 is a sectional view of the present invention.

[0027] Figure 2 is an exploded view of the present invention.

[0028] Figure 3 is a sectional view of the housing of the present invention.

[0029] Figure 4 is a structural schematic diagram of the housing claw pole of the present invention.

Specific Embodiments

[0030] The following further details the embodiments of the present invention with reference to the Figures 1-4 drawings.

[0031] Such as Figures 1-4As shown in the figure, a self-positioning claw-pole type stepping motor of the present invention includes a rotor assembly and a stator assembly arranged outside the rotor assembly; the rotor assembly includes a rotor body 6; the stator assembly includes a housing 1 and a lower coil skeleton 2, an intermediate magnetic plate 3, an upper coil skeleton 4 and an upper magnetic plate 5 sequentially assembled in the housing 1. A plurality of housing claw poles 11 extending towards the intermediate magnetic plate 3 are circumferentially spaced on the inner bottom of the housing 1. A plurality of magnetic plate claw poles 51 extending towards the intermediate magnetic plate 3 are circumferentially spaced on the upper magnetic plate 5. A plurality of middle and lower claw poles 31 and middle and upper claw poles 32 are circumferentially spaced on the intermediate magnetic plate 3 towards the inner bottom of the housing 1 and the upper magnetic plate 5 respectively. Each of the middle and lower claw poles 31 is misaligned with each of the housing claw poles 11. A lower space 12 for the middle and lower claw poles 31 to enter is formed between two adjacent housing claw poles 11. A middle and lower space 311 for the housing claw poles 11 to enter is formed between two adjacent middle and lower claw poles 31. Each of the middle and upper claw poles 32 is misaligned with each of the magnetic plate claw poles 51. A middle and upper space 321 for the magnetic plate claw poles 51 to enter is formed between two adjacent middle and upper claw poles 32. A magnetic plate space 52 for the middle and upper claw poles 32 to enter is formed between two adjacent magnetic plate claw poles 51. The areas of the inner sides of the housing claw poles 11, the middle and lower claw poles 31, the middle and upper claw poles 32 and the magnetic plate claw poles 51 facing the outer side of the rotor body 6 are equal, and the ratio of the area of the inner side of the housing claw pole 11 to the area of the outer side of the rotor body 6 satisfies S1:S2≥0.22. By relatively increasing the area of the inner side of the housing claw pole, the present invention effectively increases the excitation between the housing claw pole and the rotor body, improves the output power of the motor, optimizes the structure of the stepping motor, and has the characteristics of stable and reliable operation and high operation efficiency.

[0032] The circumferential gap between the housing claw pole 11 and the middle and lower claw pole 31 and / or the circumferential gap between the middle and upper claw pole 32 and the magnetic plate claw pole 51 satisfies 0≤α≤0.5mm, which is beneficial to reducing magnetic leakage and improving the working efficiency of the motor.

[0033] Preferably, the circumferential gap α between the housing claw pole 11 and the middle and lower claw pole 31 and / or the circumferential gap between the middle and upper claw pole 32 and the magnetic plate claw pole 51 is 0.32mm.

[0034] The number of the housing claw poles 11, the middle and lower claw poles 31, the middle and upper claw poles 32 and the magnetic plate claw poles 51 is equal and even. For example, the number of the housing claw poles 11 is 6 or 8 or 10, etc., which further increases the excitation between the housing claw pole and the rotor body and improves the working efficiency of the motor.

[0035] In order to increase the excitation between the housing claw pole and the rotor body and improve the working efficiency of the motor, the area of the inner side of the housing claw pole 11 satisfies S1≥5.68mm 2 .

[0036] Preferably, the area S1 of the inner side of the housing claw pole 11 is 8.5 mm 2 .

[0037] In order to increase the excitation between the casing claw pole and the rotor body and improve the working efficiency of the motor, the casing claw pole 11 is narrow at the top and wide at the bottom, and the casing claw pole 11 has an upper width of 1.6-2 mm, a lower width of 2.6-3 mm, and a height of 3.6-4 mm.

[0038] Preferably, the housing claw pole 11 has an upper width of 1.9 mm, a lower width of 2.96 mm, and a height of 3.86 mm.

[0039] In order to make the motor structure more stable, a plurality of housing claw poles 11 on the inner bottom of the housing 1 form a circular installation space 13 for installing the rotor body 6. The inner diameter of the installation space 13 is 12-13 mm, and the outer diameter of the rotor body 6 is smaller than the inner diameter of the installation space 13. Preferably, the inner diameter of the installation space 13 is 12.6 mm. The inner diameters of the through holes of the intermediate magnetic plate 3 and the through holes of the upper magnetic plate 5 are equal to the inner diameter of the installation space 13.

[0040] In order to reduce manufacturing costs, the rotor body 6 is made of ferrite injection molding.

[0041] The present invention provides an assembly method of a self-positioning claw-pole stepping motor, using the self-positioning claw-pole stepping motor as described above, wherein the outer diameter of the rotor body 6 is 12.2 mm, and comprises the following steps:

[0042] a. Assemble the stator assembly, assemble the lower coil frame 2, the middle magnetic plate 3, the upper coil frame 4 and the upper magnetic plate 5 in the housing 1 in sequence, the middle and lower claw poles 31 are staggered and engaged with the housing claw poles 11 so that the inner side walls of the middle and lower claw poles 31 and the housing claw poles 11 form a lower installation space, and the inner diameter of the lower installation space is 12.6 mm, the middle and upper claw poles 32 are staggered and engaged with the magnetic plate claw poles 51 so that the inner side walls of the middle and upper claw poles 32 and the magnetic plate claw poles 51 form an upper installation space that communicates with the lower installation space, and the inner diameter of the upper installation space is 12.6 mm;

[0043] b. Assemble the rotor body, place the rotor body 6 in the upper installation space and the lower installation space, and the clearance difference between the outer side wall of the rotor body 6 and the inner side wall of the upper installation space is 0.4 mm. The inner side walls of the upper installation space and the lower installation space restrict the radial movement of the rotor body 6 relative to the housing 1, and the bottom wall of the housing 1 restricts the axial downward movement of the rotor body 6 relative to the housing 1, thereby realizing the self-positioning assembly of the rotor body 6. The assembly method of a claw-pole type stepper motor capable of self-positioning in the present invention can realize the automatic positioning assembly of the rotor body, and has the characteristics of fewer assembly steps and simple assembly. In addition, the stepper motor assembled by the assembly method of the present invention has the characteristics of stable and reliable operation and high operation efficiency.

[0044] In the invention, the clearance between the outer side wall of the rotor body 6 and the inner side wall of the upper installation space is 0.2 mm.

Claims

1. A self-positioning claw-pole type stepping motor, characterized in that It includes a rotor assembly and a stator assembly provided outside the rotor assembly; The rotor assembly includes a rotor body (6); The stator assembly includes a casing (1) and a lower coil skeleton (2), an intermediate magnetic plate (3), an upper coil skeleton (4), and an upper magnetic plate (5) sequentially assembled in the casing (1). A plurality of casing claw poles (11) extending towards the intermediate magnetic plate (3) are circumferentially spaced on the inner bottom of the casing (1). A plurality of magnetic plate claw poles (51) extending towards the intermediate magnetic plate (3) are circumferentially spaced on the upper magnetic plate (5). A plurality of middle - lower claw poles (31) and middle - upper claw poles (32) are respectively circumferentially spaced on the intermediate magnetic plate (3) facing the inner bottom of the casing (1) and the upper magnetic plate (5). Each of the middle - lower claw poles (31) is misaligned with each of the casing claw poles (11), and a lower space (12) for the middle - lower claw poles (31) to enter is formed between adjacent casing claw poles (11). A middle - lower space (311) for the casing claw poles (11) to enter is formed between adjacent middle - lower claw poles (31). Each of the middle - upper claw poles (32) is misaligned with each of the magnetic plate claw poles (51), a middle - upper space (321) for the magnetic plate claw poles (51) to enter is formed between adjacent middle - upper claw poles (32), and a magnetic plate space (52) for the middle - upper claw poles (32) to enter is formed between adjacent magnetic plate claw poles (51); The areas of the inner sides of the casing claw poles (11), middle - lower claw poles (31), middle - upper claw poles (32), and magnetic plate claw poles (51) that are respectively opposite to the outer side surface of the rotor body (6) are equal, and the ratio of the area of the inner side surface of the casing claw poles (11) to the area of the outer side surface of the rotor body (6) satisfies S1:S2≥0.

22.

2. The claw-pole type stepping motor capable of self-positioning according to claim 1, wherein The circumferential gap between the casing claw poles (11) and the middle - lower claw poles (31) and the circumferential gap between the middle - upper claw poles (32) and the magnetic plate claw poles (51) satisfy 0≤α≤0.5 mm.

3. The claw-pole type stepping motor capable of self-positioning according to claim 2, wherein The circumferential gap between the casing claw poles (11) and the middle - lower claw poles (31) and the circumferential gap between the middle - upper claw poles (32) and the magnetic plate claw poles (51) α = 0.32 mm.

4. The claw-pole type stepping motor capable of self-positioning according to claim 1, wherein The circumferential gap between the casing claw poles (11) and the middle - lower claw poles (31) or the circumferential gap between the middle - upper claw poles (32) and the magnetic plate claw poles (51) satisfies 0≤α≤0.5 mm.

5. The claw-pole type stepping motor capable of self-positioning according to claim 4, wherein The circumferential gap between the casing claw poles (11) and the middle - lower claw poles (31) or the circumferential gap between the middle - upper claw poles (32) and the magnetic plate claw poles (51) α = 0.32 mm.

6. The self-aligning claw-pole type stepping motor according to claim 1, wherein The number of the casing claw poles (11), middle - lower claw poles (31), middle - upper claw poles (32), and magnetic plate claw poles (51) is equal and even.

7. The claw-pole type stepping motor capable of self-positioning according to claim 6, wherein The area of the inner side of the housing claw pole (11) satisfies S1≥5.68mm 2 .

8. The self-positioning claw-pole type stepping motor according to claim 7, characterized in that The area S1 of the inner side surface of the housing claw pole (11) is 8.5 mm 2 .

9. The claw-pole type stepping motor capable of self-positioning according to claim 1, wherein The casing claw poles (11) are arranged with a narrower upper part and a wider lower part, and the width of the upper end of the casing claw poles (11) is 1.6 - 2 mm, the width of the lower end is 2.6 - 3 mm, and the height is 3.6 - 4 mm.

10. The claw-pole type stepping motor capable of self-positioning according to claim 1, wherein A plurality of housing claw poles (11) on the inner bottom of the housing (1) enclose an installation space (13) for installing the rotor body (6) and having a circular shape. The inner diameter of the installation space (13) is 12 - 13 mm, and the outer diameter of the rotor body (6) is smaller than the inner diameter of the installation space (13).

11. A self-positioning claw-pole type stepping motor according to any one of claims 1-10, characterized in that The rotor body (6) is made of ferrite injection molding.

12. An assembling method for a self-positioning claw-pole type stepping motor, using a self-positioning claw-pole type stepping motor as described in any one of claims 1-11, wherein the outer diameter of the rotor body (6) is 12.2 mm, characterized in that It includes the following steps: a. Assemble the stator assembly. Assemble the lower coil skeleton (2), the middle magnetic plate (3), the upper coil skeleton (4), and the upper magnetic plate (5) into the housing (1) in sequence. The middle and lower claw poles (31) and the housing claw poles (11) are interlocked in a staggered manner so that the inner side walls of a plurality of middle and lower claw poles (31) and the housing claw poles (11) enclose a lower installation space. The inner diameter of the lower installation space is 12.6 mm. The middle and upper claw poles (32) and the magnetic plate claw poles (51) are interlocked in a staggered manner so that the inner side walls of a plurality of middle and upper claw poles (32) and the magnetic plate claw poles (51) enclose an upper installation space communicating with the lower installation space. The inner diameter of the upper installation space is 12.6 mm; b. Assemble the rotor body. Place the rotor body (6) in the upper installation space and the lower installation space. The clearance difference between the outer side wall of the rotor body (6) and the inner side wall of the upper installation space is 0.4 mm. The inner side walls of the upper installation space and the lower installation space restrict the radial movement of the rotor body (6) relative to the housing (1), and the bottom wall of the housing (1) restricts the axial downward movement of the rotor body (6) relative to the housing (1), thereby realizing the self - positioning assembly of the rotor body (6).

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