Stepper Motor

Abstract

The present invention provides a stepper motor, which includes two clamping plates arranged opposite to each other, a rotating shaft supported at both ends by the two clamping plates, a magnetic steel sleeved and fixed on the outer peripheral side of the rotating shaft, and a stator unit sleeved on the rotating shaft; the stator unit includes a plurality of windings, and the plurality of windings are clamped and fixed between the two clamping plates; each winding includes two claw poles sleeved and arranged opposite to each other on the rotating shaft, and at least two solenoids fixed between the two claw poles and spaced from each other, and the solenoids are spaced and arranged on opposite sides of the magnetic steel along the circumference of the rotating shaft; each solenoid includes an iron core fixed between the two claw poles and a coil wound on the outer peripheral side of the iron core; the axes of the coils arranged opposite to each other along the axial direction of the rotating shaft in each winding overlap each other. The stepper motor in the present invention can further reduce its width dimension to achieve the thinnest design of the stepper motor.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a stepping motor. Background Art

[0002] Due to its high working efficiency and energy saving and consumption reduction, stepper motors have been widely used in fields such as motors and generators.

[0003] In the related art, stepper motors can be divided into multiple winding structures according to their windings. The stepper motor with a multi-winding structure includes a rotating shaft, a magnet fixed to the outer peripheral side of the rotating shaft, and multiple windings sleeved on the rotating shaft and forming a rotational connection with the rotating shaft; wherein each winding includes two claw poles and a coil sleeved on the outer peripheral side of the claw pole.

[0004] The axis of the coil in the above-mentioned multi-winding stepper motor coincides with the axis of the stepper motor. This means that the width dimension of the multi-winding stepper motor perpendicular to its axis will be limited by the thickness of the magnet, the thickness of the claw pole and the thickness of the coil, which makes it difficult to further reduce the width dimension of the multi-winding stepper motor.

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

[0006] The object of the present invention is to provide a new stepping motor to solve the problem in the related art that the stepping motor with a multi-winding structure is difficult to further reduce its width.

[0007] To achieve the above-mentioned object, the present invention provides a stepping motor, comprising two clamping plates arranged opposite to each other, a rotating shaft having two ends respectively supported by the two clamping plates and rotatably connected thereto, a magnetic steel sleeved and fixed to the outer circumference of the rotating shaft, and a stator unit sleeved on the rotating shaft, wherein the two clamping plates are respectively located at two ends of the magnetic steel along the axial direction of the rotating shaft and are spaced apart from the magnetic steel; the stator unit comprises a plurality of windings, each of the windings being spaced apart from the magnetic steel; the plurality of windings are clamped and fixed between the two clamping plates and arranged along the axial direction of the rotating shaft;

[0008] Each of the windings includes two claw poles that are sleeved on the rotating shaft and arranged opposite to each other, and at least two solenoids fixed between the two claw poles, and the solenoids are arranged at intervals on opposite sides of the magnetic steel along the circumference of the rotating shaft; each of the solenoids includes an iron core fixed between the two claw poles and a coil wound around the outer circumference of the iron core; the axes of the coils in each winding that are arranged opposite to each other along the axial direction of the rotating shaft coincide with each other, and the two claw poles close to each other in two adjacent windings are fixedly connected, and the claw pole close to the clamping plate is fixedly connected to the clamping plate.

[0009] Preferably, each of the windings includes two solenoids, which are symmetrically arranged on opposite sides of the magnetic steel.

[0010] Preferably, when the coils in two adjacent windings are energized, the directions of the currents are the same.

[0011] Preferably, when the coils in two adjacent windings are energized, the directions of the currents are opposite.

[0012] Preferably, each of the claw poles includes a ring-shaped fixing portion and a plurality of extension portions formed by the inner periphery of the fixing portion extending along the axial direction of the rotating shaft, and the plurality of extension portions are arranged at intervals; the extension portion of one of the claw poles in the same winding extends in a direction close to the other claw pole, and the extension portions of the two claw poles are arranged alternately with each other; the solenoids in the same winding are all fixed between the fixing portions of the two claw poles, and are respectively spaced apart from the extension portions of the two claw poles, the fixing portions of the two claw poles close to each other in two adjacent windings are fixedly connected, and the fixing portion of the claw pole close to the splint is fixedly connected to the splint.

[0013] Preferably, the extending portion of one claw pole in the same winding extends to between the two extending portions of another claw pole.

[0014] Preferably, the magnetic steel includes a plurality of magnetic steels, which are arranged around the rotating shaft and are all fixed to the outer peripheral side of the rotating shaft.

[0015] Preferably, each of the clamping plates is embedded in and fixed with a bearing, and the two clamping plates are respectively fixed to the two ends of the rotating shaft through their corresponding bearing sleeves and form a rotational connection with the rotating shaft.

[0016] Compared with the related art, the stepper motor in the present invention arranges the solenoids containing coils in each winding into at least two, and arranges the solenoids at intervals on opposite sides of the magnetic steel along the circumference of the rotating shaft, and also makes the axes of the coils arranged opposite to each other along the axial direction of the rotating shaft coincide with each other, so that the axis of each coil does not coincide with the axis of the stepper motor. Accordingly, the width dimension of the stepper motor perpendicular to its axial direction will not be limited by the thickness of the coil, thereby further reducing the width dimension of the stepper motor and realizing the thinnest design of the stepper motor; in addition, by utilizing the reduction in the width dimension of the stepper motor, the torque performance of the stepper motor can be further improved by adjusting the thickness of the coil, under the premise that the overall width dimension of the stepper motor is smaller than the total width dimension of multiple windings placed side by side. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which:

[0018] Figure 1 A schematic diagram of the three-dimensional structure of a stepping motor provided by an embodiment of the present invention;

[0019] Figure 2 A partial structural exploded view of a stepping motor provided by an embodiment of the present invention;

[0020] Figure 3 for Figure 1 AA line cross-sectional view;

[0021] Figure 4 A schematic diagram of the magnetic poles and current direction of a single winding of a stepping motor provided by an embodiment of the present invention;

[0022] Figure 5 A schematic diagram of the magnetic poles and current directions of two adjacent windings of a stepping motor provided by an embodiment of the present invention.

[0023] Among them, 100, stepper motor; 1, rotating shaft; 2, magnet; 3, clamping plate; 31, bearing; 4, winding; 41, claw pole; 411, fixing part; 412, extension part; 42, solenoid; 421, iron core; 422, coil. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] The embodiment of the present invention provides a stepping motor 100, Figures 1 to 3 As shown, it includes two clamping plates 3 arranged opposite to each other, a rotating shaft 1 with its two ends supported on the two clamping plates 3 and forming a rotational connection, a magnetic steel 2 fixed on the outer peripheral side of the rotating shaft 1, and a stator unit mounted on the rotating shaft 1.

[0026] The magnetic steels 2 include multiple ones, and the multiple magnetic steels 2 are arranged around the rotating shaft 1 and are all fixed to the outer peripheral side of the rotating shaft 1. In this embodiment, the magnetic steels 2 include eight ones.

[0027] Each clamping plate 3 is embedded in a fixed bearing 31, and the two clamping plates 3 are respectively sleeved on the rotating shaft 1 through their corresponding bearings 31 and are rotatably connected to the rotating shaft 1. In other words, the bearings 31 are rotatably connected to the rotating shaft 1, and the clamping plates 3 are fixed to the outer circumference of the bearings 31.

[0028] Specifically, the stator unit includes a plurality of windings 4 and each winding 4 is spaced apart from the magnetic steel 2 . The plurality of windings 4 are clamped and fixed between two clamping plates 3 and arranged along the axial direction of the rotating shaft 1 . In this embodiment, the windings 4 include four windings 4 .

[0029] Each winding 4 includes two claw poles 41 sleeved and oppositely disposed about the rotating shaft 1, and at least two spaced-apart solenoids 42 fixed between the two claw poles 41. The solenoids 42 are spaced apart and arranged along the circumference of the rotating shaft 1 on opposite sides of the magnetic steel 2. In this embodiment, each winding 4 includes two solenoids 42, symmetrically arranged on opposite sides of the magnetic steel 2. Of course, depending on actual needs, each winding 4 can also include four solenoids 42, in which case two solenoids 42 are arranged on either side of the magnetic steel 2; or each winding 4 can also include six solenoids 42, in which case three solenoids 42 are arranged on either side of the magnetic steel 2.

[0030] Each claw pole 41 includes an annular fixed portion 411 and a plurality of extension portions 412 formed by extending the inner circumference of the fixed portion 411 along the axial direction of the rotating shaft 1, and the plurality of extension portions 412 are arranged at intervals; the extension portion 412 of one claw pole 41 in the same winding 4 extends toward the other claw pole 41, and the extension portions 412 of the two claw poles 41 are arranged in an interlaced manner; the solenoids 42 in the same winding 4 are all fixed between the fixed portions 411 of the two claw poles 41 and are respectively spaced apart from the extension portions 412 of the two claw poles 41. The fixed portions 411 of the two claw poles 41 adjacent to each other in two adjacent windings 4 are fixedly connected, and the fixed portion 411 of the claw pole 41 adjacent to the clamping plate 3 is fixedly connected to the clamping plate 3.

[0031] The extending portion 412 of one claw pole 41 in the same winding 4 extends to between the two extending portions 412 of another claw pole 41 .

[0032] Each solenoid 42 includes an iron core 421 fixed between the two claw poles 41 and a coil 422 wound around the outer circumference of the iron core 421; each iron core 421 in each winding 4 is fixed between the fixed portions 411 of the two claw poles 41, and the axes of the coils 422 in each winding 4 that are arranged opposite each other along the axial direction of the rotating shaft 1 coincide with each other.

[0033] The two claw poles 41 adjacent to each other in two adjacent windings 4 are fixedly connected; the claw pole 41 adjacent to the clamping plate 3 is fixedly connected to the clamping plate 3. This means that the two adjacent windings 4 are fixedly connected, while the two outer windings 4 are fixedly connected to the two clamping plates 3, respectively. Because the clamping plates 3 are sleeved on the rotating shaft 1 and are rotationally connected to the rotating shaft 1, the claw poles 41 in each winding 4 are indirectly sleeved on the rotating shaft 1 through the clamping plates 3 and are rotationally connected to the rotating shaft 1.

[0034] When the coils 422 of the two solenoids 42 in each winding 4 are energized, the two ends of each solenoid 42 are polarized to opposite magnetic poles, the same ends of the two solenoids 42 are polarized to the same magnetic pole, and the claw poles 41 at the same ends of the two solenoids 42 are polarized. Specifically, when the coils 422 of the two solenoids 42 in each winding 4 are energized, the two ends of the solenoid 42 are polarized to the north pole and the south pole, respectively, the same ends of the two solenoids 42 are polarized to the same magnetic pole, and the claw poles 41 at the same ends of the two solenoids 42 are polarized, so that the claw pole 41 near the north pole of the solenoid 42 is the north pole, and the claw pole 41 near the south pole of the solenoid 42 is the south pole, as shown in FIG. Figure 4 shown.

[0035] When alternating current is applied to the coils 422 of the two solenoids 42 in each winding 4 , the magnetic poles of the two claw poles 41 are alternating, ie, the claw poles 41 alternate between the north pole and the south pole, thereby realizing the rotation of the stepping motor 100 .

[0036] When the coils 422 of the solenoids 42 in two adjacent windings 4 are energized, the currents have the same direction, as shown in FIG. Figure 5 Of course, when the coils 422 of the solenoids 42 in two adjacent windings 4 are energized, the directions of the currents can be opposite. In this case, the magnetic poles generated by the solenoids 42 are opposite, which can prevent the electromagnetic field of the windings 4 from short-circuiting.

[0037] Compared with the related art, the stepper motor 100 in this embodiment is configured such that at least two solenoids 42 are provided in each winding 4, each of which includes a coil 422. The solenoids 42 are spaced apart on opposite sides of the magnet 2 along the circumference of the rotating shaft 1. The axes of the coils 422 arranged opposite to each other along the axial direction of the rotating shaft 1 in each winding 4 are also configured to coincide with each other. In this way, the axis of each coil 422 does not coincide with the axis of the stepper motor 100. Accordingly, the width of the stepper motor 100 perpendicular to its axial direction is not limited by the linear axis. The thickness of the coil 422 can be reduced, thereby further reducing the width of the stepper motor 100 and realizing the thinnest design of the stepper motor 100. In addition, by reducing the width of the stepper motor 100, the torque performance of the stepper motor 100 can be further improved by adjusting the thickness of the coil 422, under the premise that the overall width of the stepper motor 100 is smaller than the total width of multiple windings 4 placed side by side. At the same time, the stepper motor 100 in this embodiment is simpler to use and has lower cost than the stepper motor in the related art.

[0038] The above description is only an embodiment of the present invention. It should be pointed out that those skilled in the art can make improvements without departing from the creative concept of the present invention, but these improvements all fall within the scope of protection of the present invention.

Claims

1. A stepping motor, characterized in that: The stepper motor comprises two clamping plates arranged opposite to each other, a rotating shaft whose two ends are respectively supported by the two clamping plates and are rotatably connected, a magnetic steel sleeved and fixed on the outer peripheral side of the rotating shaft, and a stator unit sleeved on the rotating shaft, wherein the two clamping plates are respectively located at the two ends of the magnetic steel along the axial direction of the rotating shaft and are spaced apart from the magnetic steel; the stator unit comprises a plurality of windings and each of the windings is spaced apart from the magnetic steel, and the plurality of windings are clamped and fixed between the two clamping plates and arranged along the axial direction of the rotating shaft; Each of the windings comprises two claw poles sleeved on the rotating shaft and arranged opposite to each other, and at least two solenoids fixed between the two claw poles, and the solenoids are arranged at intervals on opposite sides of the magnetic steel along the circumferential direction of the rotating shaft; each of the solenoids comprises an iron core fixed between the two claw poles and a coil wound around the outer circumference of the iron core; the axes of the coils arranged opposite to each other along the axial direction of the rotating shaft in each of the windings coincide with each other, the axes of the coils in each of the windings are parallel to the axial direction of the rotating shaft, the two claw poles close to each other in two adjacent windings are fixedly connected, and the claw pole close to the clamping plate is fixedly connected to the clamping plate; Each of the claw poles includes an annular fixing portion and a plurality of extension portions formed by the inner circumference of the fixing portion extending along the axial direction of the rotating shaft, and the plurality of extension portions are arranged at intervals; the extension portion of one of the claw poles in the same winding extends in a direction close to the other claw pole, and the extension portions of the two claw poles are arranged alternately; the solenoids in the same winding are fixed between the fixing portions of the two claw poles, and are respectively arranged at intervals from the extension portions of the two claw poles.

2. The stepper motor according to claim 1, characterized in that: Each of the windings includes two solenoids, which are symmetrically arranged on opposite sides of the magnetic steel.

3. The stepper motor according to claim 1, characterized in that: When the coils in two adjacent windings are energized, the directions of the currents are the same.

4. The stepper motor according to claim 1, characterized in that: When the coils in two adjacent windings are energized, the directions of the currents are opposite.

5. The stepping motor according to claim 1, characterized in that: The fixing portions of the two claw poles close to each other in two adjacent windings are fixedly connected, and the fixing portion of the claw pole close to the clamping plate is fixedly connected to the clamping plate.

6. The stepping motor according to claim 1, characterized in that: The extending portions of one of the claw poles in the same winding all extend between the two extending portions of the other claw pole.

7. The stepper motor according to claim 1, characterized in that: The magnetic steel includes a plurality of magnetic steels, which are arranged around the rotating shaft and are all fixed to the outer peripheral side of the rotating shaft.

8. The stepper motor according to claim 1, characterized in that: Each of the clamping plates is embedded in and fixed with a bearing, and the two clamping plates are respectively fixed to the two ends of the rotating shaft through their corresponding bearing sleeves and are rotatably connected with the rotating shaft.

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