Coil assembly for a stepper motor

Abstract

The utility model provides a kind of coil assembly for stepping motor: including installation frame, coil, pin terminal and wire protection box;Wire protection box includes wire protection bottom plate and wire protection cover, the top of wire protection bottom plate is equipped with the first protruding part of radially extending to outside side, first protruding part is equipped with the first clamping slot, the top of wire protection cover is equipped with the first clamping block matched with first clamping slot, and first clamping block is inserted in the first clamping slot;The lower end of wire protection bottom plate is equipped with two symmetrical second clamping slots, and the lower end of wire protection cover is equipped with clamping hook, and clamping hook is clamped in corresponding second clamping slot;In the process of assembling wire protection cover to wire protection bottom plate, if clamping hook is accidentally broken, only need to replace new wire protection cover, neither pin terminal and wire need to be separated, nor wire protection bottom plate needs to be disassembled, it is simple and convenient to operate, time-saving and labor-saving;In addition, since wire protection cover structure is simple, material cost is low, and the loss caused by clamping hook breaking can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of motor equipment technology, specifically to a coil assembly for a stepper motor. Background Technology

[0002] The coil assembly is a crucial component of a stepper motor, typically comprising a mounting frame, a coil wound around the mounting frame, and pin terminals connected to the coil. A cable guard is also attached to the mounting frame, protecting the pin terminals and facilitating connection between the pin terminals and the control mechanism's wires. For ease of assembly, the cable guard usually consists of a base plate and a cover plate. First, the base plate is installed onto the mounting frame, and the pin terminals are passed through guide slots in the base plate. After connecting the control mechanism's wires to the pin terminals, the cover plate is then snapped onto the base plate, completing the final assembly.

[0003] The existing cable protection base plate and cable protection cover plate are connected by a combination of hooks and slots. The hooks are located on the cable protection base plate, and the slots are located on the cable protection cover plate. Quick assembly is achieved by inserting the hooks into the corresponding slots. However, in actual operation, the hooks on the cable protection base plate often break due to excessive pressure during transportation or assembly by workers. The cable protection base plate structure is relatively complex and costly. Furthermore, if a hook breaks during assembly, it needs to be removed, replaced, and rewired, which is quite cumbersome.

[0004] In addition, since the cable protection base plate is quickly connected by a slot at its upper end and a block on the mounting frame, the lower end of the cable protection base plate will wobble after it is installed on the mounting frame, affecting the stability of the cable protection box. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a coil assembly for stepper motors that is easy to replace and has low cost when the wire guard box fails to assemble.

[0006] The technical solution of this utility model is to provide a coil assembly for a stepper motor with the following structure: including a mounting frame, a coil wound on the mounting frame, a pin terminal disposed on the mounting frame and connected to the coil, and a wire protection box connected to the mounting frame and covering the pin terminal; the wire protection box includes a wire protection base plate and a wire protection cover plate, the top of the wire protection base plate is provided with a first protrusion extending radially outward, the first protrusion is provided with a first slot penetrating its upper and lower end faces, the top of the wire protection cover plate is provided with a first locking block that matches the first locking slot, the first locking block is inserted into the first locking slot; the lower end of the wire protection base plate is provided with two symmetrical second locking slots, the lower end of the wire protection cover plate is provided with a locking hook that corresponds to each of the second locking slots, the locking hook is engaged in the corresponding second locking slot.

[0007] With the above structure, the coil assembly for stepper motors of this invention has the following advantages compared with the prior art: This utility model sets the second slot on the base plate of the cable protector and sets the hook on the cover plate of the cable protector. If the hook breaks accidentally during the process of assembling the cover plate of the cable protector onto the base plate of the cable protector, only a new cover plate of the cable protector needs to be replaced. There is no need to separate the pin terminal from the wire or disassemble the base plate of the cable protector. The operation is simple and convenient, saving time and effort. In addition, since the cover plate of the cable protector has a simple structure and low material cost, it can reduce the loss caused by the breakage of the hook.

[0008] Preferably, the bottom plate of the cable guard is provided with two symmetrically arranged and radially extending snap-fit ​​parts at the upper end of one side wall of the mounting frame, and the snap-fit ​​parts are provided with a third snap-fit ​​groove that runs through the upper and lower ends of the snap-fit ​​parts; the mounting frame is provided with a second snap-fit ​​block that corresponds to the snap-fit ​​parts one by one, and the second snap-fit ​​block snaps into the corresponding third snap-fit ​​groove.

[0009] When assembling the cable protection base plate onto the mounting frame, simply align the third slot with the second clip and then assemble them together from top to bottom; when assembled in place, the lower end face of the clip will abut against the upper surface of the mounting frame.

[0010] Preferably, the center of the cable protection base plate is provided with a second protrusion extending radially outward, and the top of the second protrusion and the side wall facing the mounting frame are open ends; the second protrusion is provided with a plurality of guide grooves evenly spaced along its width direction and penetrating its bottom, the guide grooves are used for the corresponding pin terminals to pass through and guide the pin terminals to avoid their position from being offset, and to facilitate the connection of subsequent wires.

[0011] Preferably, the lower end of the wire protection base plate is provided with a third protrusion extending radially outward. The third protrusion is provided with a number of wire-clamping grooves that are evenly spaced and correspond one-to-one with the guide grooves. The wire-clamping grooves are used to accommodate the connection ends of the pin terminals and the connection ends of the wires, so as to facilitate connection together.

[0012] Preferably, the bottom plate of the cable guard has a glue-removing groove on the side wall facing the mounting frame, corresponding to the third protrusion. Due to the presence of the third protrusion, the material wall thickness at this location is relatively large, resulting in a high shrinkage rate after injection molding and potentially causing uneven thickness, which affects product quality. Therefore, adding a glue-removing groove reduces the wall thickness at this location, lowers the shrinkage rate, and ensures product quality.

[0013] Preferably, the bottom of the cable guard plate has two symmetrical first support protrusions on the lower sides of the side wall facing the mounting frame, and a second support protrusion is provided on the outer peripheral wall of the mounting frame at a position corresponding to the first support protrusions, with the free end of the first support protrusion abutting against the outer end face of the second support protrusion.

[0014] The cable protection base plate and the mounting frame are assembled through the engagement of the snap-fit ​​part and the third slot. The connection position is relatively high, so there is a certain amount of wobbling at the lower end of the cable protection base plate. This utility model uses the first support protrusion and the second support protrusion to push the lower end of the cable protection base plate outward, thereby making the connection between the cable protection base plate and the mounting frame more stable.

[0015] Preferably, the cable cover plate has partitions evenly spaced along its width on one side wall facing the cable base plate, and the partitions are offset from the guide grooves. Channels for the pin terminals to pass through are formed between two adjacent partitions and on the outer sides of the two end partitions, thereby guiding the connection end of the pin terminals again and preventing their position from shifting.

[0016] Preferably, the cable guard plate has several wire pressing blocks evenly spaced along its width and corresponding to the wire clamping grooves at a position below the partition. Each wire pressing block has wire clamping grooves evenly spaced along its height. The wire pressing blocks and wire clamping grooves work together to enable quick connection between the pin terminal and the wire.

[0017] Preferably, the bottom of the wire protection cover plate is provided with a plurality of wire-passing holes that are evenly spaced along its width direction and correspond one-to-one with the wire pressing blocks. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a half-sectional view of the present invention.

[0020] Figure 3 This is a schematic diagram of the mounting frame and pin terminals in this utility model.

[0021] Figure 4 This is an exploded view of the junction box of this utility model.

[0022] Figure 5 This is a schematic diagram of the structure of the protective base plate in this utility model.

[0023] Figure 6 This is a schematic diagram of the structure of the wire protection cover plate in this utility model.

[0024] Explanation of reference numerals in the attached figures: 1. Mounting frame; 11. Second locking block; 12. Second supporting protrusion; 2. Pin terminal; 3. Cable guard box; 31. Cable guard base plate; 311. First protrusion; 312. First slot; 313. Second slot; 314. Locking part; 3141. Third slot; 315. Second protrusion; 3151. Guide groove; 316. Third protrusion; 3161. Cable clamping groove; 3162. Adhesive removal groove; 317. First supporting protrusion; 32. Cable guard cover plate; 321. First locking block; 322. Hook; 323. Partition; 324. Wire pressing block; 3241. Wire pressing groove; 325. Wire hole. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0026] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. At the same time, the terms "first", "second", etc., are only used to distinguish the names of various components and do not have a primary or secondary relationship. Therefore, they should not be construed as limitations on this utility model.

[0027] like Figures 1-6 As shown, this utility model discloses a coil assembly for a stepper motor: including a mounting frame 1, a coil wound on the mounting frame 1, a pin terminal 2 disposed on the mounting frame 1 and connected to the coil, and a wire protection box 3 connected to the mounting frame 1 and covering the pin terminal 2.

[0028] The cable protection box 3 includes a cable protection base plate 31 and a cable protection cover plate 32. The top of the cable protection base plate 31 is provided with a first protrusion 311 extending radially outward. The first protrusion 311 is provided with a first slot 312 penetrating its upper and lower end faces. The top of the cable protection cover plate 32 is provided with a first locking block 321 that matches the first slot 312. The first locking block 321 is inserted into the first slot 312. The lower end of the cable protection base plate 31 is provided with two symmetrical second slots 313. The lower end of the cable protection cover plate 32 is provided with a hook 322 that corresponds to the second slots 313 one by one. The hook 322 is engaged in the corresponding second slot 313.

[0029] This utility model sets the second slot 313 on the cable protection base plate 31 and sets the hook 322 on the cable protection cover plate 32. During the process of assembling the cable protection cover plate 32 onto the cable protection base plate 31, if the hook 322 is accidentally broken, only a new cable protection cover plate 32 needs to be replaced. It is not necessary to separate the pin terminal from the wire, nor is it necessary to disassemble the cable protection base plate 31. The operation is simple and convenient, saving time and effort. In addition, since the cable protection cover plate 32 has a simple structure and low material cost, it can reduce the loss caused by the hook 322 breaking.

[0030] like Figures 1-5 As shown, the upper end of the protective base plate 31 facing the side wall of the mounting frame 1 is provided with two symmetrically arranged and radially extended snap-fit ​​parts 314. The snap-fit ​​parts 314 are provided with a third snap-fit ​​groove 3141 that runs through their upper and lower ends. The mounting frame 1 is provided with a second snap-fit ​​block 11 that corresponds to the snap-fit ​​parts 314 one by one. The second snap-fit ​​block 11 snaps into the corresponding third snap-fit ​​groove 3141.

[0031] When assembling the cable protection base plate 31 onto the mounting frame 1, simply align the third slot 3141 with the second slot 11 and then assemble them together from top to bottom; when assembled in place, the lower end face of the snap-fit ​​part 314 will abut against the upper surface of the mounting frame 1.

[0032] The bottom wall of the cable protection plate 31 facing the mounting frame 1 has two symmetrical first support protrusions 317 on both sides of the lower end. The outer peripheral wall of the mounting frame 1 has a second support protrusion 12 at the position corresponding to the first support protrusions 317. The free end of the first support protrusion 317 abuts against the outer end face of the second support protrusion 12.

[0033] The cable protection base plate 31 and the mounting frame 1 are assembled through the engagement of the snap-fit ​​part 314 and the third snap-fit ​​groove 3141. The connection position is relatively high, so there is a certain amount of wobbling at the lower end of the cable protection base plate 31. This utility model uses the first support protrusion 317 and the second support protrusion 12 to push the lower end of the cable protection base plate 31 outward, thereby making the connection between the cable protection base plate 31 and the mounting frame 1 more stable.

[0034] For example Figure 4 and Figure 5 As shown, the center of the cable protection base plate 31 is provided with a second protrusion 315 extending radially outward. The top of the second protrusion 315 and the side wall facing the mounting frame 1 are open ends. The second protrusion 315 is provided with a plurality of guide grooves 3151 that are evenly spaced along its width and penetrate its bottom. The guide grooves 3151 are used for the corresponding pin terminals 2 to pass through and guide the pin terminals 2 to avoid their position from shifting, so as to facilitate the connection of subsequent wires.

[0035] The lower end of the cable protection base plate 31 is provided with a third protrusion 316 extending radially outward. Several wire-holding grooves 3161, each corresponding to a guide groove 3151, are evenly distributed on the third protrusion 316. These grooves accommodate the connection ends of the pin terminals 2 and the wires, facilitating subsequent connection. For example... Figure 6 As shown, the cable guard plate 32, located below the partition plate 323, has several wire pressing blocks 324 evenly spaced along its width direction and corresponding one-to-one with the wire clamping grooves 3161. Each wire pressing block 324 has wire clamping grooves 3241 evenly spaced along its height direction. The wire pressing blocks 324 cooperate with the wire clamping grooves 3161 to achieve quick connection between the pin terminal 2 and the wire.

[0036] The presence of the third protrusion 316 results in a larger material wall thickness and a larger shrinkage rate after injection molding, which can easily lead to uneven thickness and affect product quality. Therefore, this invention adds a glue-removing groove 3162 to the side wall of the wire protection base plate 31 facing the mounting frame 1 at the position corresponding to the third protrusion 316, thereby reducing the wall thickness, reducing the shrinkage rate, and ensuring product quality.

[0037] like Figure 6 As shown, the protective cover plate 32 has partitions 323 evenly spaced along its width on one side wall facing the protective base plate 31. The partitions 323 are offset from the guide grooves 3151. Channels for the pin terminals 2 to pass through are formed between two adjacent partitions 323 and on the outer sides of the two end partitions 323, thereby guiding the connection end of the pin terminals 2 again and preventing its position from shifting.

[0038] The bottom of the wire protection cover plate 32 is provided with several wire holes 325 that are evenly spaced along its width and correspond one-to-one with the wire pressing block 324, allowing the wires to pass through.

[0039] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A coil assembly for a stepper motor, comprising a mounting frame (1), a coil wound on the mounting frame (1), a pin terminal (2) disposed on the mounting frame (1) and connected to the coil, and a wire housing (3) connected to the mounting frame (1) and covering the pin terminal (2); characterized in that: The cable protection box (3) includes a cable protection base plate (31) and a cable protection cover plate (32). The top of the cable protection base plate (31) is provided with a first protrusion (311) extending radially outward. The first protrusion (311) is provided with a first slot (312) penetrating its upper and lower end faces. The top of the cable protection cover plate (32) is provided with a first locking block (321) matching the first slot (312). The first locking block (321) is inserted into the first slot (312). The lower end of the cable protection base plate (31) is provided with two symmetrical second slots (313). The lower end of the cable protection cover plate (32) is provided with a hook (322) corresponding to the second slot (313). The hook (322) is engaged in the corresponding second slot (313).

2. The coil assembly for a stepper motor according to claim 1, characterized in that: The base plate (31) facing the side wall of the mounting frame (1) has two symmetrically arranged and radially extended snap-fit ​​parts (314) on its upper end. The snap-fit ​​parts (314) have a third slot (3141) that runs through its upper and lower ends. The mounting frame (1) has a second snap block (11) that corresponds to the snap-fit ​​parts (314) one by one. The second snap block (11) snaps into the corresponding third slot (3141).

3. The coil assembly for a stepper motor according to claim 1, characterized in that: The center of the wire protection base plate (31) is provided with a second protrusion (315) extending radially outward. The top of the second protrusion (315) and the side wall facing the mounting frame (1) are open ends. The second protrusion (315) is provided with a plurality of guide grooves (3151) evenly spaced along its width direction and penetrating its bottom. The guide grooves (3151) are used for the corresponding pin terminals (2) to pass through.

4. The coil assembly for a stepper motor according to claim 3, characterized in that: The lower end of the wire protection base plate (31) is provided with a third protrusion (316) extending radially outward, and the third protrusion (316) is provided with a number of wire clamping grooves (3161) that correspond one-to-one with the guide groove (3151).

5. The coil assembly for a stepper motor according to claim 4, characterized in that: The protective base plate (31) has a de-adhesive groove (3162) on the side wall facing the mounting frame (1) at the position corresponding to the third protrusion (316).

6. The coil assembly for a stepper motor according to claim 5, characterized in that: The bottom wall of the cable guard plate (31) facing the mounting frame (1) has two symmetrical first support protrusions (317) on both sides of the lower end. The mounting frame (1) has a second support protrusion (12) on the outer peripheral wall corresponding to the first support protrusion (317). The free end of the first support protrusion (317) abuts against the outer end face of the second support protrusion (12).

7. The coil assembly for a stepper motor according to claim 6, characterized in that: The protective cover plate (32) has partitions (323) evenly spaced along its width direction on one side wall facing the protective base plate (31), and the partitions (323) are offset from the guide groove (3151).

8. The coil assembly for a stepper motor according to claim 7, characterized in that: The wire protection cover plate (32) is provided with a number of wire pressing blocks (324) that are evenly spaced along its width direction and correspond one-to-one with the wire clamping groove (3161) at the position below the partition plate (323). The wire pressing block (324) is provided with wire pressing grooves (3241) that are evenly spaced along its height direction.

9. The coil assembly for a stepper motor according to claim 8, characterized in that: The bottom of the wire protection cover plate (32) is provided with a number of wire holes (325) that are evenly spaced along its width direction and correspond one-to-one with the wire pressing block (324).

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