Integrated framework with optimized assembly structure and stepping motor

Abstract

The utility model relates to the technical field of stepping motors, in particular to an integrated framework with an optimized assembly structure and a stepping motor, comprising a stator framework and a middle pole plate, the stator framework is used for winding a coil assembly, the middle pole plate is integrally formed in the stator framework, and the middle pole plate is arranged in the stator framework. The stator framework is provided with a first end plate, a second end plate and a third end plate, the middle polar plate is integrally formed on the second end plate, and two sides of the middle polar plate are wrapped by the second end plate; and the outer diameter of the second end plate is the same as that of the middle polar plate, so that the second end plate completely covers the upper and lower side surfaces of the middle polar plate. In conclusion, when the integrated framework is assembled, invisible damage to the enameled wire can be avoided, the probability of defective products is reduced, and the service life of the integrated framework is prolonged. In addition, the cable can be prevented from being scratched when penetrating out of the motor, the cable can be prevented from being scratched by the cover plate, and the assembly efficiency can be further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of stepping motors, in particular to an integrated skeleton with an optimized assembly structure and a stepping motor. Background Art

[0002] The claw-pole type stepping motor is widely used in various intelligent machinery fields. The claw-pole type stepping motor can include a motor housing and a stator assembly, a rotor assembly, and a gear assembly installed inside the motor housing. The stator assembly includes a stator skeleton, a first pole plate having a plurality of first pole claws, and a second pole plate having a plurality of second pole claws. The stator skeleton includes a plurality of end plates and a cylindrical wall connecting the plurality of end plates.

[0003] With the improvement of people's living quality, the market defective rate requirements for products in the intelligent machinery field and the like are very high. At present, the defective rate of the existing claw-pole type stepping motor has been controlled at about 10 PPM, but it still cannot meet the more stringent requirements of special customers, and they even pursue zero defects. Currently, one of the most likely defects in the claw-pole type stepping motor is the problem of potential invisible damage to the cable during the assembly process, which easily causes the motor to malfunction after running for a period of time.

[0004] In order to improve production efficiency, most of the existing claw-pole type stepping motors currently adopt an integrated skeleton, and the middle pole plate is integrally manufactured by an integral molding process using the integrated skeleton, that is, the middle pole plate is already included inside the integrated skeleton when leaving the factory. Subsequently, the coil is wound on the integrated skeleton, and during this process, the edge of the middle pole plate may damage the enameled wire of the winding coil, resulting in the risk of short circuit of the enameled wire in the later stage.

[0005] Moreover, when the coil circuit exits the motor, that is, where there is a need for a clamping position, there should be no scratching, so further optimization settings are required. Summary of the Utility Model

[0006] The utility model aims to provide a technical solution to solve the above problems in order to overcome the above deficiencies.

[0007] The utility model provides an integrated skeleton with an optimized assembly structure, including a stator skeleton and a middle pole plate. The stator skeleton is used for winding a coil assembly. The middle pole plate is integrally formed inside the stator skeleton. The stator skeleton is provided with a first end plate, a second end plate, and a third end plate. The middle pole plate is integrally formed on the second end plate, and both sides of the middle pole plate are wrapped by the second end plate; the outer diameter of the second end plate is the same as the outer diameter of the middle pole plate, so that the second end plate completely covers the upper and lower sides of the middle pole plate.

[0008] As a further scheme of the utility model: the outer diameter of the first end plate is smaller than the outer diameter of the second end plate.

[0009] As a further solution of the utility model: The outer diameter of the third end plate is smaller than that of the second end plate.

[0010] As a further solution of the utility model: Guide posts are provided on the upper side surface of the first end plate, and the guide posts are used to guide the upper pole plate to be installed on the stator skeleton.

[0011] As a further solution of the utility model: Chamfers are provided on the outer edges of the tops of the guide posts, so that the diameters of the tops of the guide posts are gradually reduced by a certain value, thereby facilitating the installation of the upper pole plate.

[0012] As a further solution of the utility model: A rotor cavity is provided at the axis of the stator skeleton for installing a rotor assembly. The middle pole plate is provided with a first pole plate and a second pole plate that are superposed and abutted against each other. First pole claws are provided on the inner peripheral surface of the first pole plate, and the first pole claws are bent towards the first end plate and abut against the inner wall of the rotor cavity; Second pole claws are provided on the inner peripheral surface of the second pole plate, and the second pole claws are bent towards the third end plate and abut against the inner wall of the rotor cavity.

[0013] As a further solution of the utility model: A first winding space is formed between the first end plate, the second end plate and the outer wall of the rotor cavity for winding the first coil; A second winding space is formed between the second end plate, the third end plate and the outer wall of the rotor cavity for winding the second coil.

[0014] The utility model also provides a stepping motor, which includes the above-mentioned integrated skeleton with an optimized assembly structure, and also includes a housing, a cover plate and a wire protection box. The stator skeleton, the coil assembly and the rotor assembly cooperate with each other and are installed inside the housing. The wire protection box is fixedly connected to the side wall of the housing, and the cover plate is buckled on the opening end of the housing and abuts against the wire protection box.

[0015] As a further solution of the utility model: The wire protection box is provided with a long strip-shaped opening for the internal wires of the motor to pass through. One end in the long side direction of the long strip-shaped opening is provided with a notch for the assembly of the wires, so that the wires are snapped into the long strip-shaped opening through the notch.

[0016] As a further solution of the utility model: The notch and the long strip-shaped opening are combined to form a 7-shaped through hole, so that after the wire is snapped in from the notch, it is received in the long strip-shaped opening, thereby preventing the cover plate from scratching the wire.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] 1. By setting the outer diameter of the second end plate of the stator skeleton to be the same as that of the middle pole plate, the second end plate can completely cover the middle pole plate axially, thus avoiding the situation where the metal edge of the middle pole plate damages the enameled wire of the coil winding, further reducing the probability of defective products in the stepper motor and extending its service life.

[0019] 2. A 7-shaped through hole is also opened on the wire protection box. The notch enables the cable to be normally inserted into the long strip-shaped opening, so that it can be stored at one end of the long strip-shaped opening without a notch, preventing the cover plate from scratching the cable and improving the assembly efficiency.

[0020] Therefore, through the above improvements, the present utility model can provide an integrated skeleton and a stepper motor with an optimized assembly structure. When the integrated skeleton is assembled, it can avoid invisible damage to the enameled wire, reduce the probability of defective products, and extend its service life. It can also prevent the cable from being scratched when passing through the motor and prevent the cover plate from scratching the cable, and further improve the assembly efficiency.

[0021] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 is the overall structural schematic diagram of the stepper motor of the present utility model;

[0024] Figure 2 is the structural schematic diagram of the stator skeleton of the present utility model;

[0025] Figure 3 is the structural schematic diagram of the rotor cavity of the present utility model;

[0026] Figure 4 is the structural schematic diagram of the wire protection box of the present utility model;

[0027] Figure 5 is the structural schematic diagram of the middle pole plate of the present utility model;

[0028] Figure 6 is the structural schematic diagram of the positioning post of the present utility model.

[0029] The reference numerals and names in the figures are as follows:

[0030] 10 Stator skeleton; 11 First end plate; 12 Second end plate; 13 Third end plate; 14 Guide post; 15 Rotor cavity; 16 Positioning post; 20 Middle plate; 21 Positioning hole; 22 First pole plate; 23 First pole claw; 24 Second pole plate; 25 Second pole claw; 31 First winding space; 32 Second winding space; 40 Housing; 41 Cover plate; 42 Wire protection box; 43 Long strip-shaped opening; 44 Notch. Specific embodiments

[0031] Next, the technical solutions in the embodiments of the present invention will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0032] Please refer to Figures 1 to 6 , in the embodiments of the present invention, an integrated skeleton with an optimized assembly structure includes a stator skeleton 10 and a middle plate 20. The stator skeleton 10 is used for winding a coil assembly. The middle plate 20 is integrally formed inside the stator skeleton 10. The stator skeleton 10 is provided with a first end plate 11, a second end plate 12, and a third end plate 13. The middle plate 20 is integrally formed on the second end plate 12, and both sides of the middle plate 20 are wrapped by the second end plate 12. The outer diameter of the second end plate 12 is the same as the outer diameter of the middle plate 20, so that the second end plate 12 completely covers the upper and lower sides of the middle plate 20. The outer diameter of the first end plate 11 is smaller than the outer diameter of the second end plate 12. The outer diameter of the third end plate 13 is smaller than the outer diameter of the second end plate 12. The outer diameter of the first end plate 11 is equal to the outer diameter of the third end plate 13.

[0033] Specifically, since the middle plate 20 has been wrapped in the middle during the production of the integrated skeleton by the integral forming process, when winding the enameled wire of the coil winding on the skeleton, for the relatively thin enameled wire during winding, the situation of scratching the metal edge of the middle plate 20 may occur. Therefore, a second end plate 12 can be provided at the outer ring part of the middle plate 20 to cover the middle plate 20, so that the plastic material of the second end plate 12 can completely wrap and cover the outer periphery of the middle plate 20 in the axial direction of the skeleton, preventing the situation of its metal edge scratching the enameled wire.

[0034] Secondly, since the stator skeleton 10 needs to be assembled inside the housing 40 of the motor after winding the coil winding, it is preferably to set the outer diameter of the third end plate 13 to be smaller than the outer diameter of the second end plate 12. When the stator skeleton 10 is placed inside the housing 40, due to the smaller outer circumference of its third end plate 13, it can be placed into the housing 40 more smoothly. In the case where the third end plate 13 has been placed, even if the outer diameter of the second end plate 12 is equal to the inner diameter of the housing 40, it can apply a downward thrust to the stator skeleton 10 to make it move downward, forming a relatively tight fitting and assembling state.

[0035] As for the first end plate 11, its outer diameter can also be made smaller than that of the second end plate 12, so that the stator skeleton 10 can also be conveniently pulled out from the housing 40, facilitating subsequent maintenance. As Figure 5 and Figure 6 shown, preferably, the middle plate 20 is also provided with a positioning hole 21, and the second end plate 12 can also be provided with a positioning post 16, so that during the integral molding process, the middle plate 20 can be accurately wrapped in the required position, ensuring that the second end plate 12 forms a good coverage of the outer circumference of the middle plate 20.

[0036] As Figure 2 and Figure 6 shown, preferably, a guide post 14 is provided on the upper side surface of the first end plate 11, and the guide post 14 is used to guide the installation of the upper plate (not shown in the figure) on the stator skeleton 10. A chamfer is provided on the outer edge of the top of the guide post 14, so that the diameter of the top of the guide post 14 gradually decreases by a certain value, thereby facilitating the installation of the upper plate.

[0037] Specifically, usually, the lower end of the housing 40 is set as the lower plate, and a part of it bent inward forms a lower pole claw corresponding to the second pole claw 25. And at the upper end of the stator skeleton 10, an upper plate also needs to be provided, and a part of the upper plate bent downward forms an upper pole claw corresponding to the first pole claw 23. In order to improve the installation efficiency of the upper plate and better position it for assistance, a guide post 14 can be provided to guide and position it. And in order to enable the upper plate to complete the assembly better, preferably, a chamfer is provided on the edge above the guide post 14 to form a wedge shape for guiding the assembly of the upper plate.

[0038] As Figure 2 and Figure 3As shown, preferably, a rotor cavity 15 is provided at the axis of the stator skeleton 10 for installing a rotor assembly. The middle pole plate 20 is provided with a first pole plate 22 and a second pole plate 24 that are superposed and abutted against each other. A first pole claw 23 is provided on the inner peripheral surface of the first pole plate 22. The first pole claw 23 bends towards the first end plate 11 and abuts against the inner wall of the rotor cavity 15. A second pole claw 25 is provided on the inner peripheral surface of the second pole plate 24. The second pole claw 25 bends towards the third end plate 13 and abuts against the inner wall of the rotor cavity 15.

[0039] Specifically, between the first end plate 11 and the second end plate 12, they are connected by a cylindrical body. Similarly, between the second end plate 12 and the third end plate 13, they are also connected by a cylindrical body. The inner wall of the cylindrical body can form the rotor cavity 15 for the rotor assembly to rotate. In order to achieve small-angle rotation of the stepper motor, preferably, pole claws need to be provided. The first pole claw 23 is set on the first pole plate 22 and bends towards the first end plate 11. The second pole claw 25 is set on the second pole plate 24 and bends towards the third end plate 13. Thus, corresponding pole claws are formed on the inner wall of the rotor cavity 15, enabling the rotor assembly to cooperate with the pole claws to form a small-angle rotation effect.

[0040] As Figure 6 shown, preferably, a first winding space 31 is formed between the first end plate 11, the second end plate 12 and the outer wall of the rotor cavity 15 for winding a first coil. A second winding space 32 is formed between the second end plate 12, the third end plate 13 and the outer wall of the rotor cavity 15 for winding a second coil.

[0041] Specifically, in order to make the rotor assembly rotate, a coil winding also needs to be wound on the stator skeleton 10. Two winding spaces can be formed on the corresponding stator skeleton 10, thereby forming two windings, enabling the rotor assembly to generate two different rotation modes, and thus achieving the effect of its stepping rotation.

[0042] As Figure 1 、 Figure 3 and Figure 4As shown in the figure, the present utility model further provides an embodiment, namely a stepping motor, which includes a housing 40, a cover plate 41 and a wire protection box 42. A stator skeleton 10, a coil assembly and a rotor assembly cooperate with each other and are installed inside the housing 40. The wire protection box 42 is fixedly connected to the stator skeleton 10. The cover plate 41 is buckled on the opening end of the housing 40 and forms an abutment against the wire protection box 42. The wire protection box 42 is provided with a long strip-shaped opening 43 for the internal wires of the motor to pass through. One end of the long strip-shaped opening 43 in the long side direction is provided with a notch 44 for the assembly of the wires, so that the wires can be snapped into the long strip-shaped opening 43 through the notch 44. The notch 44 and the long strip-shaped opening 43 are combined to form a 7-shaped through hole, so that after the wires are snapped into the notch 44, they are received in the long strip-shaped opening 43, thereby preventing the cover plate 41 from scratching the wires.

[0043] Specifically, after the coil winding is completed on the stator skeleton 10, the end of the cable needs to be led out of the motor so that it can be connected to an external circuit and operate normally. The traditional wire protection box 42 only has a through hole, and the wire end needs to be pulled out after passing through the through hole. The process is troublesome, the operation is inconvenient, and the cable is easily scratched. Later, a notch 44 was provided in the middle of the through hole, so that the cable can be snapped into the through hole through the notch 44. However, the notch 44 starts in the middle. Although the assembly process is simplified and labor is saved, the cable is not sufficiently limited, which easily leads to the cable coming out.

[0044] Therefore, the present utility model first lengthens the length of the opening to form a long strip-shaped opening 43, and then opens a notch 44 at one end of the long side direction, so that the cable can be snapped into the long strip-shaped opening 43 through the notch 44, thereby simplifying the assembly process and saving labor costs. At the same time, the 7-shaped structure of the long strip-shaped opening 43 can also make the other end have a relatively long card strip, which can provide more perfect fiber for the cable to prevent the cable from coming out. It can also prevent the cover plate 41 from scratching the cable, and at the same time improve its assembly efficiency and optimize the production process.

[0045] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model.

Claims

1. An integrated frame with an optimized assembly structure, characterized in that: The invention comprises a stator frame (10) and a central electrode plate (20), wherein the stator frame (10) is used for winding a coil assembly, the central electrode plate (20) is integrally formed inside the stator frame (10), the stator frame (10) is provided with a first end plate (11), a second end plate (12) and a third end plate (13), the central electrode plate (20) is integrally formed with the second end plate (12), and both sides of the central electrode plate (20) are wrapped by the second end plate (12); the outer diameter of the second end plate (12) is the same as the outer diameter of the central electrode plate (20), so that the second end plate (12) completely covers the upper and lower side surfaces of the central electrode plate (20).

2. The one-piece frame with optimized assembly structure according to claim 1, characterized in that: The outer diameter of the first end plate (11) is smaller than the outer diameter of the second end plate (12).

3. The one-piece frame with optimized assembly structure according to claim 1, characterized in that: The outer diameter of the third end plate (13) is smaller than the outer diameter of the second end plate (12).

4. The one-piece frame with optimized assembly structure according to claim 1, characterized in that: A guide column (14) is provided on the upper side of the first end plate (11), and the guide column (14) is used to guide the upper pole plate to be installed on the stator frame (10).

5. The one-piece frame with optimized assembly structure according to claim 4, characterized in that: The outer edge of the top of the guide column (14) is provided with a chamfer, so that the diameter of the top of the guide column (14) is gradually reduced by a certain value, thereby facilitating the installation of the upper electrode plate.

6. The one-piece frame with optimized assembly structure according to claim 1, characterized in that: A rotor cavity (15) is provided at the axis of the stator frame (10) for mounting a rotor assembly. The middle pole plate (20) is provided with a first pole plate (22) and a second pole plate (24) which are superimposed on each other and abut against each other. A first pole claw (23) is provided on the inner circumference of the first pole plate (22). The first pole claw (23) is bent toward the first end plate (11) and abuts against the inner wall of the rotor cavity (15). A second pole claw (25) is provided on the inner circumference of the second pole plate (24). The second pole claw (25) is bent toward the third end plate (13) and abuts against the inner wall of the rotor cavity (15).

7. The one-piece frame with optimized assembly structure according to claim 1, characterized in that: A first winding space (31) is formed between the first end plate (11), the second end plate (12) and the outer wall of the rotor cavity (15), for winding a first coil; and a second winding space (32) is formed between the second end plate (12), the third end plate (13) and the outer wall of the rotor cavity (15), for winding a second coil.

8. A stepping motor, characterized in that: An integrated frame having an optimized assembly structure according to any one of claims 1 to 7, further comprising a shell (40), a cover plate (41) and a wire protection box (42), wherein the stator frame (10), the coil assembly and the rotor assembly cooperate with each other and are installed inside the shell (40), the wire protection box (42) is fixed to the side wall of the shell (40), and the cover plate (41) is buckled on the open end of the shell (40) and abuts against the wire protection box (42).

9. A stepping motor according to claim 8, characterized in that: The wire protection box (42) is provided with a long strip opening (43), and the long strip opening (43) is used for the wire inside the motor to pass through. A notch (44) is provided at one end in the long side direction of the long strip opening (43), and the notch (44) is used for assembling the wire, so that the wire passes through the notch (44) and is inserted into the long strip opening (43).

10. A stepping motor according to claim 9, characterized in that: The notch (44) and the long strip opening (43) are combined to form a 7-shaped through hole, so that after the wire is inserted through the notch (44), it is received in the long strip opening (43), thereby preventing the cover plate (41) from scratching the wire.

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