Stepping motor

Abstract

Provided in the present invention is a stepping motor, comprising a rotating shaft, a steel magnet sleeved and fixed on the outer circumferential side of the rotating shaft, a winding unit sleeved on the rotating shaft, and flexible circuit boards fixed to the winding unit, wherein the winding unit comprises two windings; each winding comprises a housing sleeved on the rotating shaft and forming a rotational connection with the rotating shaft, two bobbins fixed to the inner circumferential side of the housing and coaxially arranged with the housing, and a coil fixed to each bobbin; each bobbin comprises two claw poles disposed opposite each other, and the coil is wound around the outer circumferential side of the two claw poles of a same bobbin; two flexible circuit boards are provided, each of which is electrically connected to all the coils in a corresponding winding, and the ends of the two flexible circuit boards close to each other are welded together to form an electrical connection. The stepping motor of the present invention enables a reduction in the number of windings required during the assembly of the entire motor, thereby simplifying the assembly process, reducing concentricity deviations after assembly, and avoiding the risk of entire motor loss caused by anomalies in a single coil.

Description

Stepping motor TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a stepping motor. BACKGROUND

[0002] Stepping motor has been widely used in the field of electric motor and generator due to its compact structure, high work efficiency, energy saving and other advantages. In recent years, the demand for using stepping motor to directly drive load work equipment in industrial field is becoming more and more urgent, and the wide application of these stepping motor direct drive equipment will bring great energy saving benefit.

[0003] In the related art, the stepping motor can be divided into multiple winding structures according to its winding, wherein the stepping motor with four winding structures includes a rotating shaft, a magnetic steel fixed to the outer circumferential side of the rotating shaft, and a winding set on the rotating shaft and connected with the rotating shaft to form a rotating connection, wherein the winding includes four, each winding includes a shell, two claw poles and a coil, and the winding is set on the rotating shaft after assembly to form a complete stepping motor.

[0004] Although the above-mentioned stepping motor with four winding structures can form a complete stepping motor after assembly, the four windings need to be assembled separately, and the four assembled windings need to be set on the rotating shaft, which is not only cumbersome, but also needs to ensure the concentricity of the four windings, which is easy to cause deviation of the concentricity, and even causes the stepping motor to become unqualified product.

[0005] Therefore, it is necessary to provide a new stepping motor to solve the above technical problems. TECHNICAL PROBLEM

[0006] The purpose of the present application is to provide a stepping motor to solve the problem of cumbersome assembly and easy deviation of concentricity of the stepping motor with four winding structures in the related art. TECHNICAL SOLUTION

[0007] In order to achieve the above-mentioned purpose, the present application provides a stepping motor, which includes a rotating shaft, a magnetic steel set and fixed to the outer circumferential side of the rotating shaft, a winding unit set on the rotating shaft and connected with the rotating shaft to form a rotating connection, and a flexible circuit board fixed to the winding unit and electrically connected with the winding unit, the winding unit includes two windings and is spaced apart from the magnetic steel;

[0008] Each winding includes a shell set on the rotating shaft and connected with the rotating shaft to form a rotating connection, two skeletons fixed to the inner circumferential side of the shell and coaxially arranged with the shell, and a coil fixed to each skeleton, each skeleton includes two claw poles arranged oppositely, and the coil is arranged around the outer circumferential side of the two claw poles in the same skeleton.

[0009] The flexible circuit board includes two and is fixed to the outer circumferential side of the shell in two windings respectively, each of the flexible circuit board is electrically connected with all the coils in the corresponding winding respectively, and the two flexible circuit boards are welded together at the end close to each other to form an electrical connection.

[0010] Preferably, each of the claw poles includes a fixed part fixed in the shell and annular, and a plurality of extension parts formed by the inner circumferal of the fixed part extending along the axial direction; the extension parts are arranged at intervals; the extension part of each of the claw poles in the same skeleton extends to the direction close to the other claw pole.

[0011] Preferably, the extension part of each of the claw poles in the same skeleton extends between the two extension parts of the other claw pole.

[0012] Preferably, each of the skeletons further includes a support member sleeved and fixed to the extension parts of the two claw poles; the coil is wound on the outer circumferential side of the support member.

[0013] Preferably, the shell includes a body part which is hollow and open at both ends, and a cover part which is covered on the end of the body part away from the other shell; the rotating shaft is fixed to the cover part through a bearing and forms a rotating connection with the cover part.

[0014] Preferably, the inner circumferential side of the body part is provided with a step which protrudes inwardly; one of the claw poles in each of the skeletons is fixed to one side of the step.

[0015] Preferably, the body part is provided with a plurality of avoiding holes formed therethrough; one end of the coil passes through the avoiding hole and is connected with the flexible circuit board.

[0016] Preferably, the magnetic steel includes a plurality of, and a plurality of the magnetic steel is arranged around and fixed to the outer circumferential side of the rotating shaft at intervals.

[0017] Preferably, the stepping motor further includes two spacers sleeved on the rotating shaft and spaced from each other, and the two spacers abut against the two ends of the magnetic steel respectively. Advantages

[0018] Compared with the related art, the stepping motor in the application simplifies the number of windings during the assembly of the whole machine, makes the process simpler, reduces the deviation of the concentricity after the assembly, and can also replace the single coil when the single coil is abnormal, so as to avoid the risk of the whole machine being damaged due to the single coil being abnormal. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0020] Fig. 1 is a perspective structural schematic view of a stepping motor provided by an embodiment of the present application;

[0021] Fig. 2 is a partial structural exploded view of a stepping motor provided by an embodiment of the present application;

[0022] Fig. 3 is a sectional view along line A-A of Fig. 1.

[0023] Among them, 100, stepping motor; 1, rotating shaft; 2, magnetic steel; 3, winding; 31, shell; 311, body part; 3111, step; 3112, avoiding hole; 312, cover; 32, skeleton; 321, claw pole; 3211, fixed part; 3212, extension; 33, coil; 34, support; 35, bearing; 4, flexible circuit board; 5, gasket. Embodiment of the present application

[0024] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0025] The embodiment of the present application provides a stepping motor 100, which is shown in combination with Figs. 1 to 3, and includes a rotating shaft 1, a magnetic steel 2 sleeved and fixed to the outer circumferential side of the rotating shaft 1, a winding unit sleeved to the rotating shaft 1 and forming a rotating connection with the rotating shaft 1, and a flexible circuit board 4 fixed to the winding unit and electrically connected with the winding unit; the winding unit includes two windings 3 and is spaced apart from the magnetic steel 2.

[0026] The plurality of magnetic steels 2 are arranged around the outer circumferential side of the rotating shaft 1 and are fixed at intervals. Of course, the number of the magnetic steels 2 can be consistent with the number of the windings 3 or can be inconsistent with the number of the windings 3.

[0027] Each winding 3 comprises a shell 31 sleeved on the rotating shaft 1 and forming a rotating connection with the rotating shaft 1, two skeletons 32 fixed on the inner circumferential side of the shell 31 and arranged coaxially with the shell 31, and a coil 33 fixed on each skeleton 32. Each skeleton 32 comprises two claw poles 321 arranged oppositely, and the coil 33 is arranged around the outer circumferential side of the two claw poles 321 in the same skeleton 32.

[0028] The shell 31 comprises a body part 311 which is hollow and has two open ends, and a cover part 312 which is arranged on one end of the body part 311 away from the other shell 31. The rotating shaft 1 is fixed to the cover part 312 through a bearing 35 and forms a rotating connection with the cover part 312.

[0029] The inner circumferential side of the body part 311 is provided with a step 3111 which protrudes inwardly. One of the claw poles 321 in each skeleton 32 is fixed to one side of the step 3111. This design facilitates the fixation of the claw poles 321 in the middle region of the shell 31.

[0030] The body part 311 is also provided with a plurality of avoiding holes 3112 formed therethrough. One end of the coil 33 is connected with the flexible circuit board 4 through the avoiding hole 3112. This design facilitates the coil 33 to pass through the shell 31 to be connected with the flexible circuit board 4.

[0031] Each claw pole 321 comprises a fixed part 3211 which is fixed in the shell 31 and is annular, and a plurality of extension parts 3212 which are formed by the inner circumferential edge of the fixed part 3211 extending in the axial direction. The plurality of extension parts 3212 are arranged at intervals. The extension part 3212 of each claw pole 321 in the same skeleton 32 extends towards the other claw pole 321.

[0032] The extension part 3212 of each claw pole 321 in the same skeleton 32 extends between the two extension parts 3212 of the other claw pole 321. This design facilitates the plurality of extension parts 3212 of the two claw poles 321 in the skeleton 32 to form staggered arrangement, so as to facilitate the fixation of the coil 33.

[0033] Each skeleton 32 further comprises a support 34 which is sleeved and fixed on the extension parts 3212 of the two claw poles 321. The coil 33 is arranged around the outer circumferential side of the support 34. This design forms a flat annular plane on the outer circumferential side of the two claw poles 321 in the skeleton 32, so as to facilitate the fixation of the coil 33.

[0034] The flexible circuit board 4 includes two flexible circuit boards 4 respectively fixed to the outer circumferential side of the shell 31 in the two windings 3, each flexible circuit board 4 is electrically connected with all the coils 33 in the corresponding winding 3, and the two flexible circuit boards 4 are welded together at the end close to each other to form an electrical connection. This design not only realizes the electrical connection between all the coils 33, but also enables individual replacement when a single coil 33 is abnormal, thereby avoiding the risk of machine loss caused by the abnormality of a single coil 33.

[0035] The flexible circuit board 4 is specifically fixed to the outer circumferential side of the body part 311 of the shell 31.

[0036] In the embodiment, the stepping motor 100 further includes two spacers 5 sleeved on the rotating shaft 1 and spaced from each other, and the two spacers 5 are respectively abutted against the two ends of the magnetic steel 2. This design can reinforce the fixing strength between the magnetic steel 2 and the rotating shaft 1.

[0037] In the embodiment, the stepping motor 100 is designed by taking each winding 3 as one shell 31 plus four claw poles 321 and two coils 33, i.e., two small windings are combined into one winding 3, and each winding 3 is designed with one flexible circuit board 4 electrically connected with all the coils 33 in the winding 3, and the two flexible circuit boards 4 are welded together to realize the electrical connection between all the coils 33 in the two windings 3, thereby simplifying the number of windings 3 during the assembly of the whole machine, making the process simpler, reducing the concentricity deviation after assembly, and enabling individual replacement when a single coil 33 is abnormal, thereby avoiding the risk of machine loss caused by the abnormality of a single coil 33.

[0038] The above only describes the embodiments of the present application, and it should be noted that those skilled in the art can make improvements without departing from the inventive concept, and these improvements are within the protection scope of the present application.

Claims

1. A stepper motor characterized by comprising: The step motor comprises a rotating shaft, a magnetic steel sleeved and fixed to the outer circumferential side of the rotating shaft, a winding unit sleeved to the rotating shaft and rotationally connected with the rotating shaft, and a flexible circuit board fixed to the winding unit and electrically connected with the winding unit, and the winding unit comprises two windings and is spaced from the magnetic steel; Each winding comprises a housing sleeved to the rotating shaft and rotationally connected with the rotating shaft, two skeletons fixed to the inner circumferential side of the housing and coaxially arranged with the housing, and a coil fixed to each skeleton, each skeleton comprises two claw poles arranged oppositely, and the coil is arranged around the outer circumferential side of the two claw poles in the same skeleton. The flexible circuit board comprises two and is fixed to the outer circumferential side of the housing in two windings respectively, each flexible circuit board is electrically connected with all coils in the corresponding winding respectively, and the two flexible circuit boards are welded together at the end close to each other to form an electrical connection.

2. The stepper motor of claim 1, wherein, Each claw pole comprises a fixed part fixed to the housing and annular, and a plurality of extension parts formed by the inner circumferential edge of the fixed part extending in the axial direction, and the plurality of extension parts are spaced; the extension part of each claw pole in the same skeleton extends to the direction close to the other claw pole.

3. The stepper motor of claim 2, wherein, The extension part of each claw pole in the same skeleton extends to between the two extension parts of the other claw pole.

4. The stepper motor of claim 2, wherein, Each skeleton further comprises a support member sleeved and fixed to the extension parts of the two claw poles; and the coil is arranged around the outer circumferential side of the support member.

5. The stepper motor of claim 1, wherein, The housing comprises a body part which is hollow and open at both ends, and a cover part which is sleeved to one end of the body part away from the other housing; the rotating shaft is fixed to the cover part through a bearing and rotationally connected with the cover part.

6. The stepper motor of claim 5, wherein, The inner circumferential side of the body part is provided with a step protruding inwardly; one of the claw poles in each skeleton is fixed to one side of the step.

7. The stepper motor of claim 5 wherein, The body part is provided with a plurality of avoiding holes formed therethrough; one end of the coil is connected with the flexible circuit board through the avoiding hole.

8. The stepper motor of claim 1, wherein, The magnetic steel comprises a plurality of, and the plurality of magnetic steels are arranged around and fixed to the outer circumferential side of the rotating shaft.

9. The stepper motor of claim 1 wherein, The step motor further comprises two spacers sleeved to the rotating shaft and spaced from each other, and the two spacers are respectively abutted to the two ends of the magnetic steel.

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