Coil framework and stepping motor

Abstract

The utility model discloses a coil framework and a stepping motor. The coil framework comprises a framework body and a terminal, wherein a buffering part is arranged at the winding end of the terminal; according to the coil framework, the buffering parts are arranged at the winding ends of the terminals, the edges and corners of the terminals can be wrapped, breakage of enameled wires caused by overlarge tension during winding of the enameled wires is avoided, the buffering parts can provide certain deformation buffering for the enameled wires during transportation or stress of the terminals, direct breakage of the enameled wires is avoided, the probability of breakage of the enameled wires is reduced, and the service life of the enameled wires is prolonged. And the product yield is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of stepping motors, in particular to a coil frame and a stepping motor. Background Art

[0002] A stepper motor is an induction motor, which is an open-loop control stepper motor element that converts electrical pulse signals into angular displacement. Under non-overload conditions, the speed and stop of the stepper motor only depend on the frequency and number of pulses of the pulse signal, and are not affected by load changes. Therefore, stepper motors are widely used as actuators that convert electrical pulses into angular displacement.

[0003] When a stepper motor is in use, it is generally necessary to solder the conductive terminals on the stepper motor to a PCB board so that the stepper motor can be controlled through the PCB board.

[0004] Patent application No. 201922393544.X discloses a stepper motor coil skeleton, which includes a skeleton body, characterized in that the skeleton body includes a first skeleton, a second skeleton and a pin base; the pin base is placed between the first skeleton and the second skeleton, and the first skeleton and the second skeleton are fixedly connected through the pin base; the first skeleton, the second skeleton and the pin base are integrally formed; a gap is left between the first skeleton and the second skeleton, and two central magnetic plates are arranged in the gap; one end of the central magnetic plate is fixedly connected to the pin base; the pin base is staggered up and down Four pin slots, each of which has a pin body; the first pin body and the third pin body are connected to one of the central magnetic plates; the second pin body and the fourth pin body are connected to the other central magnetic plate; this solution integrates the two skeletons and the pin base into one piece, and no longer uses glue for assembly, has fewer assembly steps, stable dimensions, high precision, only needs to be put on a winding machine once to complete coil winding, has high structural strength, and has better comprehensive use effect; although it solves the problem of many assembly steps and poor precision, it does not solve the problem of stable connection between the conductive pin and the pin base.

[0005] For example, patent application number CN201820008196.2 discloses a secondary pressing needle for a stepper motor skeleton, comprising a coil assembly, a square pin, an enameled wire, a skeleton and a skeleton hole, wherein the skeleton is provided with two skeleton holes, and the square pins are provided with two. The two skeleton holes are inserted with the square pins, and the enameled wires are interconnected between the two square pins and the skeleton, and the square pins, the enameled wires and the skeleton constitute the coil assembly; in this scheme, a secondary pressing needle method is adopted to completely insert the square pins into the bottom of the skeleton hole to relax the enameled wire, thereby eliminating the deficiencies in the existing manufacturing process, improving the qualified rate of finished product production, and effectively reducing the occurrence of wire breakage.

[0006] The above stepper motor skeleton also has the following disadvantages:

[0007] 1. The split conductive terminals on the market are connected to the frame through circuit board connection or welding. The welding is not firm, which can easily cause short circuit, open circuit and other poor connection problems;

[0008] 2. Most of the existing conductive terminals are square in structure. When the square terminals are wound with enameled wires, the edges and corners of the terminals may damage the enameled wires or break them under stress, resulting in a high rate of scrapping and defective products in the production line. Therefore, the utility model discloses a coil skeleton to solve the above problems. Utility Model Content

[0009] Based on this, it is necessary to provide a coil skeleton to address the above-mentioned technical problems. A buffer portion is provided on the winding end of the terminal, which can wrap the edges and corners of the terminal to prevent the enameled wire from breaking due to excessive tension when winding the enameled wire. During transportation or when the terminal is subjected to force, the buffer portion can provide a certain deformation buffer for the enameled wire to avoid direct breakage of the enameled wire, reduce the chance of breakage of the enameled wire, and improve the product yield.

[0010] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0011] A coil frame comprises a frame body and a terminal fixed on the frame body, wherein a buffer portion is provided on the winding end of the terminal.

[0012] As a further implementation optimization of a coil skeleton provided by the utility model, the skeleton body and the buffer part are an integrated structure.

[0013] As a further implementation optimization of the coil skeleton provided by the utility model, the terminal is fixed by integrally injection-molding the skeleton body and the buffer part.

[0014] As a further implementation optimization of a coil skeleton provided by the utility model, the buffer portion includes a cylinder and a cone connected as one body.

[0015] As a further implementation optimization of a coil skeleton provided by the utility model, the cross-sectional shape of the terminal is a polygon.

[0016] As a further implementation optimization of a coil skeleton provided by the utility model, the polygon is a square or a rectangle.

[0017] As a further implementation optimization of a coil skeleton provided by the utility model, the coil skeleton has five terminals, one of which is a common terminal and the remaining four are independent terminals; the independent terminal is an L-shaped structure or a quasi-L-shaped structure and has a winding end; the common terminal is formed by two L-shaped rods symmetrically connected and has two winding ends.

[0018] As a further implementation optimization of a coil skeleton provided by the utility model, the winding end and the use end of the independent terminal are bent at right angles.

[0019] As a further implementation optimization of a coil skeleton provided by the utility model, the skeleton body includes a first skeleton, a second skeleton and a terminal base, and the terminal is fixed on the terminal base.

[0020] As a further implementation optimization of a coil skeleton provided by the utility model, the coil skeleton is obtained by integrally injection molding a skeleton body, a middle electrode plate, a buffer portion and a terminal, and the middle electrode plate is arranged in the axial middle part of the skeleton body.

[0021] A stepping motor comprises any of the above-mentioned coil frames.

[0022] Compared with the prior art, the utility model has the following beneficial effects:

[0023] The coil skeleton provided by the utility model is provided with a buffer part on the winding end of the terminal, which can wrap the edges and corners of the terminal to avoid the enameled wire from breaking due to excessive tension when winding the enameled wire. When transporting or the terminal is subjected to force, the buffer part can provide a certain deformation buffer for the enameled wire to avoid direct breakage of the enameled wire, reduce the probability of breakage of the enameled wire, and improve the product yield.

[0024] The terminal adopts an integrated bending structure to solve the risk of instability caused by welding, ensure the stability of circuit connectivity, simplify the assembly process, reduce manual workload, and save production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the scheme in the utility model, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A three-dimensional schematic diagram of the overall structure of the coil skeleton provided by the utility model;

[0027] Figure 2 A front view schematic diagram of the overall structure of the coil skeleton provided by the utility model;

[0028] Figure 3 A schematic side view of the overall structure of the coil skeleton provided by the utility model;

[0029] Figure 4 This is a schematic diagram of the terminal distribution structure in the coil skeleton provided by the utility model;

[0030] Figure 5 This is a schematic diagram of the common terminal structure in the coil skeleton provided by the utility model;

[0031] Figure 6 This is a schematic diagram of the structure of one of the independent terminals in the coil skeleton provided by the utility model;

[0032] Figure 7 A schematic diagram of the connection between the middle pole plate and the pole teeth in the coil skeleton provided by the utility model;

[0033] Figure 8 This is a schematic diagram of the structure of the buffer part of the coil skeleton provided by the utility model;

[0034] Fig. 9 This is a schematic diagram of the installation structure of the utility model and the motor cover.

[0035] The markings in the figure are as follows:

[0036] 1. First frame; 2. Second frame; 3. Terminal base; 4. Terminal; 41. Common terminal; 42. Independent terminal; 43. Bending structure; 44. Winding end; 45. Use end; 5. Buffer part; 51. Cylinder; 52. Cone; 53. Square through hole; 6. Middle plate; 7. Pole teeth; 8. Groove; 9. Plastic baffle; 10. Motor cover; 101. Notch. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0038] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0039] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0040] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0041] Example 1

[0042] Please refer to Figure 1-8 , a coil skeleton is provided, which includes a first skeleton 1, a second skeleton 2, a terminal base 3 and a terminal 4. The first skeleton 1, the second skeleton 2 and the terminal base 3 are integrally injection molded to form a skeleton body. The terminal 4 is arranged on the terminal base 3. When the terminal base 3 is being injection molded, the terminal 4 is placed in the injection mold. After the injection molding is completed, the terminal 4 is also fixed with the terminal base 3. The terminal 4 is an integral bending structure. After the terminal 4 is fixed with the terminal base 3, the terminal 4 will not be offset, which ensures the stability of the terminal 4, improves the installation accuracy of the terminal 4, reduces the welding process when assembling the terminal 4, and reduces the assembly process. A buffer part 5 is provided on the winding end 44 of the terminal 4, and the buffer part 5 is made of an elastic material with a certain supporting force. The buffer part 5 and the skeleton body adopt an integral structure. Specifically, the buffer part 5 and the skeleton body are injection molded together, which saves the assembly time and cost of the buffer part 5, and also ensures the stability of the buffer part 5, and prevents the buffer part 5 from slipping off the winding end 44 of the terminal 4. After the injection molding is completed, the buffer portion 5 and the frame body can be encapsulated with glue to fix the terminal 4 .

[0043] The cross-sectional shape of the terminal 4 is polygonal. Specifically, the cross-sectional shape of the terminal 4 is square or rectangular. In this example, the cross-sectional shape of the terminal 4 is square, and an edge is formed between two adjacent side surfaces of the terminal 4. The buffer portion 5 wraps around the winding end 44 of the terminal 4 to prevent the edge from cutting the enameled wire.

[0044] The buffer part 5 includes a cylinder 51 and a cone 52, and the cylinder 51 and the cone 52 are connected as a whole and are formed by integral injection molding. At the same time, one end of the cylinder 51 away from the cone 52 is in contact with the skeleton body. When winding the enameled wire, the enameled wire is first wound on the cylinder 51, and then after buffering and extending through the cone 52, it is wound on the winding end 44 of the corresponding part. After the winding of the enameled wire is completed, the tinning operation is performed, and the winding end 44 of the terminal 4 is connected to the enameled wire. The setting of the buffer part avoids tinning too deep, so that the inner winding of the enameled wire is reserved for 1-2 turns without tinning, thereby avoiding the breakage of the enameled wire during later production and use.

[0045] The first frame 1 and the second frame 2 have the same size and are symmetrically arranged. The terminal base 3 is arranged between the two first frames 1 and the second frames 2. The first frame 1 and the second frame 2 are coaxially arranged in parallel. The first frame 1 and the second frame 2 are both nylon frames. Two intermediate plates 6 are arranged between the first frame 1 and the second frame 2, such as in the middle of the axial direction. The inner walls of the first frame 1 and the second frame 2 are both embedded with pole teeth 7. The pole teeth 7 are set to five and are arranged at equal intervals around the circumference. The pole teeth 7 and the intermediate plates 6 on the corresponding side are an integrated structure, that is, the pole teeth 7 in the first frame 1 are an integrated structure with the intermediate plates 6 attached to the first frame 1, and the pole teeth 7 in the second frame 2 are an integrated structure with the intermediate plates 6 attached to the second frame 2. During injection molding, the two intermediate plates 6 are also integrally injection molded with the frame body and the buffer portion 5, so that the first frame 1 and the second frame 2 can tightly wrap the intermediate plates 6, so that the two intermediate plates 6 are close to each other.

[0046] The central axis of the buffer portion 5 is arranged parallel to the central axes of the first skeleton 1 and the second skeleton 2. Matchingly, the terminal 4 of the sleeve portion of the buffer portion 5 is arranged parallel to the central axis of the buffer portion 5. Grooves 8 are arranged on the outer surfaces of the first skeleton 1 and the second skeleton 2. After the enameled wire is wound in the groove 8, the enameled wire is wound on the buffer portion 5. This structural setting allows the enameled wire to be in a tangent position at the connection between the buffer portion 5 and the groove 8, avoiding the enameled wire from turning and further reducing the risk of the enameled wire breaking.

[0047] The coil frame is used for a stepper motor. Specifically, the coil frame is fixedly installed in a motor cover of the stepper motor.

[0048] Example 2

[0049] The coil skeleton provided in Example 1 is further optimized, specifically, as follows Figure 4-6 As shown, there are five terminals 4 in the winding skeleton, among which the one in the middle is a common terminal 41, and two independent terminals 42 are distributed on both sides of the common terminal 41, and the two independent terminals 42 on each side are symmetrically arranged, and the independent terminal 42 is an L-shaped structure or a quasi-L-shaped structure, and the bending angle of the terminal 4 is 90°, one end of which extends out of the terminal base 3 to form a winding end 44, and the other end extends out of the terminal base 3 as a use end 45, and the winding end 44 and the use end 45 are bent at a right angle. The structure 43 is used to meet the use size of the client on the one hand, and on the other hand, the distance between the winding end 44 and the common terminal 41 is adjusted to avoid the problem of the winding ends 44 of the terminals being too close to each other when winding and winding. The common terminal 41 is a T-shaped structure as a whole, which is formed by two L-shaped rods symmetrically connected, and has two winding ends 44 and two use ends 45. The winding end 44 and the use end 45 are respectively arranged in parallel with the winding end 44 and the use end 45 corresponding to the independent terminal 42.

[0050] like Figure 1 ,4 9, specifically, after the terminal 4 and the terminal base 3 are integrally injection molded, both ends of the independent terminal 42 and the common terminal 41 extend out of the terminal base 3, wherein the independent terminal 42 and the common terminal 41 extend from a surface of the terminal base 3 away from the skeleton body as the use end 45, extend from two symmetrical side surfaces of the terminal base 3 as the winding end 44, and the buffer portion 5 is provided on the two side surfaces of the terminal base 3. The use ends 45 extending from the independent terminal 42 and the common terminal 41 both pass through the plastic baffle 9, which can be assembled independently later, or can be integrally injection molded with the terminal base 3 on the skeleton body. When the coil skeleton is assembled to the motor cover 10 later, the plastic baffle 9 covers the notch 101 of the motor cover 10 to achieve a sealing effect.

[0051] Example 3

[0052] The coil skeleton provided in Example 2 is further optimized, specifically, as follows: Figure 1 , 8 As shown, the buffer portion 5 is a plastic structure.

[0053] As an implementation method, the buffer portion 5 and the skeleton body are designed separately. A square through hole 53 is provided on the buffer portion 5 to facilitate the terminal 4 to pass through the buffer portion 5, and the size of the square through hole 53 on the buffer portion 5 is smaller than the size of the terminal 4, so that the buffer portion 5 and the terminal 4 are interference-fitted, and the directional through hole on the buffer portion 5 is deformed, and the terminal 4 is squeezed by its own elastic force, thereby increasing the friction force and fixing the buffer portion 5.

[0054] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] Obviously, the embodiments described above are only some embodiments of the utility model, rather than all embodiments. The preferred embodiments of the utility model are given in the accompanying drawings, but they do not limit the patent scope of the utility model. The utility model can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to replace some of the technical features therein with equivalents. Any equivalent structure made using the contents of the utility model specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the utility model.

Claims

1. A coil skeleton, comprising a skeleton body and a terminal fixed on the skeleton body, characterized in that: A buffer portion is provided on the winding end of the terminal.

2. A coil skeleton according to claim 1, characterized in that: The skeleton body and the buffer part are an integrated structure.

3. A coil skeleton according to claim 1 or 2, characterized in that: The terminal is fixed by integrally injection-molding the frame body and the buffer portion.

4. A coil skeleton according to claim 1, characterized in that: The buffer portion comprises a cylindrical body and a cone body which are connected as one body.

5. A coil skeleton according to claim 3, characterized in that: The cross-section of the terminal is a polygon.

6. A coil skeleton according to claim 5, characterized in that: The polygon is a square or a rectangle.

7. A coil skeleton according to claim 1, characterized in that: The coil frame has five terminals, one of which is a common terminal and the remaining four are independent terminals; the independent terminal is an L-shaped structure or a quasi-L-shaped structure and has a winding end; the common terminal is formed by symmetrically connecting two L-shaped rods and has two winding ends.

8. A coil skeleton according to claim 7, characterized in that: The winding end and the use end of the independent terminal are bent at right angles.

9. A coil skeleton according to claim 1, characterized in that: The coil skeleton is obtained by integrally injecting a skeleton body, a middle electrode plate, a buffer part and a terminal, and the middle electrode plate is arranged in the axial middle part of the skeleton body.

10. A stepping motor, characterized in that: It comprises the coil bobbin according to any one of claims 1-9.

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