Stepper motor and winding device

Abstract

The present invention provides a stepper motor and a winding device, wherein the stepper motor comprises two clamping plates arranged opposite to each other, a rotating shaft having two ends respectively supported on the two clamping plates, a magnetic steel member sleeved and fixed on the outer peripheral side of the rotating shaft, and a stator unit sleeved on the rotating shaft; the stator unit comprises a winding spaced apart from the magnetic steel member; the winding comprises a hollow housing sandwiched between the two clamping plates, a claw pole fixed to one end of the housing and arranged coaxially therewith, and a coil wound around the outer peripheral side of the claw pole; lead wires at both ends of the coil respectively extend out of the housing; the portion of the claw pole in contact with the coil and the housing are both coated with an insulating coating. The stepper motor in the present invention can increase the effective arrangement space thereof, and can also increase the torque thereof on the premise of the same volume.

Description

Stepper motor and winding device Technical Field

[0001] This invention relates to the field of motor technology, and more particularly to a stepper motor and a winding device. Background Technology

[0002] Stepper motors have been widely used in fields such as electric motors and generators due to their high efficiency and energy saving.

[0003] A stepper motor mainly includes a rotating shaft, a magnet fixed to the outer periphery of the rotating shaft, and a winding sleeved on the rotating shaft. The winding mainly includes a housing sleeved on the rotating shaft and rotatably connected to the rotating shaft, a claw pole fixed to the housing and coaxially arranged, an insulating frame fixed to the outer periphery of the claw pole, and a coil fixed to the outer periphery of the frame.

[0004] In related technologies, stepper motors require an insulating frame to be designed between the claw poles and the coils, which reduces the effective layout space of the stepper motor and reduces its torque for the same volume.

[0005] Therefore, it is necessary to provide a new stepper motor and winding device to solve the above-mentioned technical problems. Technical issues

[0006] The purpose of this invention is to provide a new stepper motor and winding device to solve the problem in the related art that the effective arrangement space of the stepper motor is reduced, and the torque is reduced under the premise of the same volume. Technical solutions

[0007] To achieve the above objectives, in a first aspect, the present invention provides a stepper motor, comprising two opposing clamping plates, a rotating shaft with its two ends respectively supported by and rotatably connected to the two clamping plates, a magnet sleeved and fixed to the outer periphery of the rotating shaft, and a stator unit sleeved on the rotating shaft. The two clamping plates are located at the two ends of the magnet along the axial direction of the rotating shaft and are spaced apart from the magnet. The stator unit includes windings spaced apart from the magnet, and the windings are clamped and fixed between the two clamping plates.

[0008] The winding includes a hollow housing sandwiched between two clamping plates, a claw pole fixed to one end of the housing and coaxially arranged with the housing, and a coil wound around the outer periphery of the claw pole, with the two ends of the coil extending out of the housing respectively; the portions of the claw pole that contact the coil and the housing are coated with an insulating coating.

[0009] Preferably, the claw pole includes a fixed part fixed to one end of the housing and in an annular shape, and a plurality of extensions formed by the inner periphery of the fixed part extending axially therefrom, the plurality of extensions being spaced apart; the coil is wound around and fixed to the outer periphery of the plurality of extensions.

[0010] Preferably, the housing includes a hollow cylindrical portion, a first fixing portion extending inward from one end of the cylindrical portion away from the claw pole and forming an annular shape, and a plurality of first extension portions extending axially from the inner periphery of the first fixing portion, the plurality of first extension portions being spaced apart, each first extension portion extending to between two adjacent extension portions of the claw pole; the claw pole is fixed to one end of the cylindrical portion.

[0011] Preferably, the claw pole further includes a snap-fit ​​portion extending outward from the outer periphery of the fixing portion, the snap-fit ​​portion extending outside the housing; the winding further includes a sheet-like skeleton, the sheet-like skeleton including a platform portion stacked and fixed to the side of the fixing portion near the extension portion, a protrusion portion extending outward from the outer periphery of the platform portion and stacked and fixed to the snap-fit ​​portion, and two winding posts extending outward from the side of the protrusion portion away from the platform portion, the two winding posts being spaced apart from each other; the two ends of the coil are respectively wound around the two winding posts.

[0012] Preferably, the protrusion is provided with an inwardly recessed lead groove on the side away from the fixing part, and the lead groove extends from the inner peripheral side of the fixing part to the winding post.

[0013] Preferably, the sheet-like skeleton further includes a limiting slot formed by the protrusion extending from the side of the protrusion near the snap-fit ​​portion, the snap-fit ​​portion being received and accommodated within the limiting slot, and the limiting slot and the fixing portion being located on the same plane.

[0014] Preferably, the insulating coating applied to the claw electrode covers the extension.

[0015] Preferably, the windings include multiple windings arranged sequentially along the axial direction of the shaft; the two fixing parts of any two adjacent windings press against each other and are fixed by welding.

[0016] Secondly, the present invention provides a winding device applied to a stepper motor as described above, comprising a hollow sleeve and a mandrel inserted within the sleeve. The mandrel comprises a first section, a second section, and a third section that extend sequentially and have progressively increasing outer diameters. The first section is used to sleeve the claw pole, the outer periphery of the second section is recessed to form an extension groove that matches the extension portion of the claw pole, and the third section is used to sleeve the sleeve. When the claw pole is sleeved on the first section, each extension portion is respectively engaged in one of the extension grooves. Beneficial effects

[0017] Compared with related technologies, the stepper motor of this invention has an insulating coating applied to both the contact area between the claw pole and the coil, as well as the housing. This allows the coil to be directly fixed to the claw pole, freeing up the space occupied by the insulating frame and increasing the effective arrangement space of the stepper motor. When the increased space is applied to the coil, the total number of turns of the coil can be increased within the same volume, thereby increasing the torque of the stepper motor. When the increased space is applied to the magnet, the outer diameter and magnetic properties of the magnet can be increased within the same volume, thereby increasing the torque of the stepper motor. In other words, the stepper motor of this invention can increase its effective arrangement space and, within the same volume, also increase its torque. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0019] Figure 1 is a three-dimensional structural diagram of a stepper motor provided in Embodiment 1 of the present invention;

[0020] Figure 2 is a partial exploded view of a stepper motor provided in Embodiment 1 of the present invention;

[0021] Figure 3 is a cross-sectional view along line AA in Figure 1;

[0022] Figure 4 is an exploded structural diagram of the housing and sheet-like frame in a stepper motor provided in Embodiment 1 of the present invention;

[0023] Figure 5 is a schematic diagram of the structure of a winding device after winding is completed according to Embodiment 2 of the present invention;

[0024] Figure 6 is a schematic diagram of the structural decomposition of Figure 5.

[0025] Among them, 100 is a stepper motor; 1 is a clamping plate; 11 is a bearing; 2 is a rotating shaft; 3 is a magnet; 4 is a winding; 41 is a housing; 411 is a cylindrical part; 412 is a first fixing part; 413 is a first extension part; 42 is a claw pole; 421 is a fixing part; 422 is an extension part; 423 is a snap-fit ​​part; 424 is a pressing part; 43 is a coil; 44 is a sheet-like skeleton; 441 is a platform part; 442 is a protrusion; 4421 is a lead groove; 443 is a winding post; 444 is a limiting bayonet; and 5 is a gasket.

[0026] 200. Winding device; 201. Sleeve; 202. Mandrel; 2021. First section; 2022. Second section; 20221. Extension groove; 2023. Third section. Embodiments of the present invention

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1

[0029] This invention provides a stepper motor 100, as shown in Figures 1 to 4. It includes two clamping plates 1 arranged opposite to each other, a rotating shaft supported at both ends of the two clamping plates 1 and rotatably connected thereto, a magnet 3 sleeved and fixed to the outer periphery of the rotating shaft, and a stator unit sleeved on the rotating shaft. The two clamping plates 1 are located at both ends of the magnet 3 along the axial direction of the rotating shaft and are spaced apart from the magnet 3. The stator unit includes a winding 4 spaced apart from the magnet 3 and is clamped and fixed between the two clamping plates 1.

[0030] Each clamping plate 1 is embedded with a bearing 11, and each clamping plate 1 is fixed to the rotating shaft through its bearing 11 and forms a rotatable connection with the rotating shaft.

[0031] The winding 4 comprises multiple windings arranged sequentially along the axial direction of the shaft, and the multiple windings 4 have the same structure. In this embodiment, the winding 4 comprises two windings.

[0032] Specifically, the winding 4 includes a hollow housing 41 sandwiched between two clamping plates 1, a claw pole 42 fixed to one end of the housing 41 and coaxially arranged with the housing 41, and a coil 43 wound around the outer periphery of the claw pole 42. The two ends of the coil 43 extend to the outside of the housing 41 respectively. The part of the claw pole 42 that contacts the coil 43 and the housing 41 are coated with an insulating coating.

[0033] The claw pole 42 includes a fixed part 421 fixed to one end of the housing 41 and in an annular shape, a plurality of extensions 422 formed by extending axially from the inner periphery of the fixed part 421, and a snap-fit ​​part 423 formed by protruding outward from the outer periphery of the fixed part 421. The plurality of extensions 422 are spaced apart, and the snap-fit ​​part 423 extends to the outside of the housing 41. The coil 43 is wound and fixed to the outer periphery of the plurality of extensions 422.

[0034] An insulating coating applied to the claw electrode 42 covers the extension 422.

[0035] The claw pole 42 also includes a pressing portion 424 that protrudes outward from the outer periphery of the fixing portion 421. The pressing portion 424 and the engaging portion 423 are located on opposite sides of the fixing portion 421, respectively. This design allows the pressing portion 424 to better limit the claw pole 42 and constrain its rotational degree of freedom.

[0036] The coil 43 can be directly wound around the outer periphery of the extension 422; or the wire can be pre-made into a coil 43 that matches the extension 422 and then fitted and fixed to the outer periphery of the extension 422.

[0037] In this embodiment, the two fixing parts 421 of the two windings 4 abut against each other and are fixed by welding. This can improve the fixing strength of the claw pole 42.

[0038] The housing 41 includes a hollow cylindrical portion 411, a first fixing portion 412 extending inward from the end of the cylindrical portion 411 away from the claw pole 42 and forming an annular shape, and a plurality of first extension portions 413 extending axially from the inner periphery of the first fixing portion 412. The plurality of first extension portions 413 are spaced apart, and each first extension portion 413 extends to the space between two adjacent extension portions 422 of the claw pole 42. The fixing portion 421 of the claw pole 42 is fixed to one end of the cylindrical portion 411.

[0039] Specifically, the winding 4 also includes a sheet-like frame 44, which includes a platform portion 441 stacked and fixed to the side of the fixing portion 421 near the extension portion 422, a protruding portion 442 extending from the outer periphery of the platform portion 441 and stacked and fixed to the snap-fit ​​portion 423, and two winding posts 443 extending from the side of the protruding portion 442 away from the platform portion 441. The two winding posts 443 are spaced apart from each other; the two ends of the coil 43 are respectively wound around the two winding posts 443. This design facilitates the fixing of the two ends of the coil 43.

[0040] The protrusion 442 has an inwardly recessed lead groove 4421 on the side away from the fixing part 421, and the lead groove 4421 extends from the inner circumference of the fixing part 421 to the winding post 443. This design allows room for one of the wire ends of the coil 43.

[0041] The sheet-like skeleton 44 also includes a limiting slot 444 formed by the protrusion 442 extending from the side near the engaging portion 423. The engaging portion 423 is received within the limiting slot 444, and the limiting slot 444 and the fixing portion 421 are located on the same plane. This design enables assembly positioning through the cooperation between the limiting slot 444 and the engaging portion 423, and restricts the degree of freedom of rotation of the claw pole 42.

[0042] Specifically, the stepper motor 100 also includes two spacers 5 that are fixed to the rotating shaft and spaced apart from each other, with the two spacers 5 respectively abutting against the two ends of the magnet 3.

[0043] Compared with related technologies, the stepper motor 100 in this embodiment provides an insulating coating on the part of the claw pole 42 that contacts the coil 43 and the housing 41. This allows the coil 43 to be directly fixed to the claw pole 42, thereby freeing up the space occupied by the insulating frame and increasing the effective arrangement space of the stepper motor 100. When the increased space is applied to the coil 43, the total number of turns of the coil 43 can be increased under the premise of the same volume, thus increasing the torque of the stepper motor 100. When the increased space is applied to the magnet 3, the outer diameter and magnetic properties of the magnet 3 can be increased under the premise of the same volume, thus increasing the torque of the stepper motor 100. That is, the stepper motor 100 of the present invention can increase its effective arrangement space and, under the premise of the same volume, can also increase its torque.

[0044] Example 2

[0045] This invention provides a winding device 200, applied to the stepper motor 100 in the first embodiment described above. As shown in Figures 5 and 6, it includes a hollow sleeve 201 and a spindle 202 inserted into the sleeve 201. The spindle 202 includes a first section 2021, a second section 2022, and a third section 2023 that extend sequentially and have progressively increasing outer diameters. The first section 2021 is used to fit a claw pole 42. The outer periphery of the second section 2022 is recessed to form an extension groove 20221 that matches the extension portion 422 of the claw pole 42. The third section 2023 is used to fit the sleeve 201. When the claw pole 42 is fitted onto the first section 2021, each extension portion 422 is engaged in an extension groove 20221.

[0046] The winding device 200 is mainly used to wind the coil 43 in Embodiment 1 onto the extension 422 of the claw pole 42. In use, the fixing part 421 of the claw pole 42 is sleeved on the mandrel 202, and the extension 422 is brought close to the sleeve 201. Then, one end of the coil 43 is wound and fixed to one of the winding posts 443, and then the coil 43 is wound sequentially on the outside of the extension 422. After the coil 43 is wound, the other end is wound and fixed to another winding post 443. Then, the mandrel 202 is pulled out from the fixing part 421 of the claw pole 42, and at the same time, the sleeve 201 is pressed against the coil 43 to prevent the coil 43 from being pulled out. After the mandrel 202 is pulled out of the sleeve 201, the sleeve 201 is removed to complete the winding of the coil 43.

[0047] The number of extension slots 20221 is the same as the number of extensions 422 and their structures match. The main purpose is to prevent the coil 43 from collapsing or bending during winding. Of course, depending on actual needs, multiple extensions 422 can form at least a partially closed state or a fully closed state with each other.

[0048] The winding device 200 in this embodiment can stably and quickly wind the coil 43 onto the extension 422 of the claw pole 42, avoiding unstable and slow winding of the coil 43.

[0049] The above description is merely an embodiment of the present invention. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of the present invention, but these improvements all fall within the protection scope of the present invention.

Claims

1. A stepper motor, comprising two opposing clamping plates, a rotating shaft with both ends respectively supported by and rotatably connected to the two clamping plates, a magnet sleeved and fixed to the outer periphery of the rotating shaft, and a stator unit sleeved on the rotating shaft, wherein the two clamping plates are located at both ends of the magnet along the axial direction of the rotating shaft and are spaced apart from the magnet; the stator unit includes windings spaced apart from the magnet, the windings being clamped and fixed between the two clamping plates; characterized in that, The winding includes a hollow housing sandwiched between two clamping plates, a claw pole fixed to one end of the housing and coaxially arranged with the housing, and a coil wound around the outer periphery of the claw pole, with the two ends of the coil extending out of the housing respectively; the portions of the claw pole that contact the coil and the housing are coated with an insulating coating.

2. The stepper motor as described in claim 1, characterized in that, The claw pole includes a fixed part that is fixed to one end of the housing and is in the shape of an annulus, and a plurality of extensions that are formed by the inner periphery of the fixed part extending along its axial direction, the plurality of extensions being spaced apart; the coil is wound around and fixed to the outer periphery of the plurality of extensions.

3. The stepper motor as described in claim 2, characterized in that, The housing includes a hollow cylindrical portion, a first fixing portion extending inward from one end of the cylindrical portion away from the claw pole and forming an annular shape, and a plurality of first extension portions extending axially from the inner periphery of the first fixing portion. The plurality of first extension portions are spaced apart, and each first extension portion extends to the space between two adjacent extension portions of the claw pole. The claw pole is fixed to one end of the cylindrical portion.

4. The stepper motor as described in claim 2, characterized in that, The claw pole further includes a snap-fit ​​portion extending outward from the outer periphery of the fixing portion, the snap-fit ​​portion extending outside the housing; the winding further includes a sheet-like skeleton, the sheet-like skeleton including a platform portion stacked and fixed to the side of the fixing portion near the extension portion, a protrusion portion extending outward from the outer periphery of the platform portion and stacked and fixed to the snap-fit ​​portion, and two winding posts extending outward from the side of the protrusion portion away from the platform portion, the two winding posts being spaced apart from each other; the two ends of the coil are respectively wound around the two winding posts.

5. The stepper motor as described in claim 4, characterized in that, The protrusion is provided with an inwardly recessed lead groove on the side away from the fixing part, and the lead groove extends from the inner circumference of the fixing part to the winding post.

6. The stepper motor as described in claim 4, characterized in that, The sheet-like skeleton also includes a limiting slot formed by the protrusion extending from the side of the protrusion near the snap-fit ​​portion, the snap-fit ​​portion being received and accommodated within the limiting slot, and the limiting slot and the fixing portion being located on the same plane.

7. The stepper motor as described in claim 2, characterized in that, An insulating coating applied to the claw pole covers the extension.

8. The stepper motor as described in claim 1, characterized in that, The windings include multiple windings arranged sequentially along the axial direction of the shaft; the two fixing parts of any two adjacent windings press against each other and are fixed by welding.

9. A winding device applied to a stepper motor as described in claim 2, characterized in that, The winding device includes a hollow sleeve and a mandrel inserted inside the sleeve. The mandrel includes a first section, a second section, and a third section that extend sequentially and have progressively larger outer diameters. The first section is used to fit the claw pole. The outer periphery of the second section is recessed to form an extension groove that matches the extension portion of the claw pole. The third section is used to fit the sleeve. When the claw pole is fitted onto the first section, each extension portion is engaged in one of the extension grooves.

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