Stepping motor

Abstract

The invention provides a stepping motor. The stepping motor comprises two opposite clamping plates, a rotating shaft, magnetic steel and a stator unit, wherein the two ends of the rotating shaft are supported on the two clamping plates respectively; the magnetic steel is fixedly arranged on the peripheral side of the rotating shaft in a sleeving manner; the stator unit comprises a plurality of windings, and the plurality of windings are clamped and fixed between the two clamping plates; each winding comprises two claw poles which sleeve the rotating shaft and are oppositely arranged and at least two solenoids which are fixed between the two claw poles and are mutually spaced, and the solenoids are respectively arranged on two opposite sides of the magnetic steel at intervals along the circumferential direction of the rotating shaft; each solenoid comprises an iron core fixed between the two claw poles and a coil wound on the peripheral side of the iron core; and the axes of the coils which are oppositely arranged in the axial direction of the rotating shaft in each winding coincide with each other. According to the stepping motor, the width size of the stepping motor can be further reduced, so that the thinnest design of the stepping motor is realized.

Description

Technical Field

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

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

[0003] In the related art, a stepper motor can be divided into multiple winding structures according to its winding. A 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 rotatingly connected 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, which means that the width dimension of the multi-winding stepper motor perpendicular to its axis will be limited by the thickness of the magnetic steel, 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 it is difficult to further reduce the width of the stepping motor with a multi-winding structure.

[0007] In order to achieve the above-mentioned object, the present invention provides a stepping motor, which comprises two clamping plates arranged opposite to each other, a rotating shaft whose two ends are respectively supported by the two clamping plates and form a rotation connection, 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 which 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 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 which are arranged opposite to each other along the axial direction of the rotating shaft in each winding 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.

[0008] Preferably, each of the windings includes two solenoids, which are symmetrically arranged on opposite sides of the magnetic steel.

[0009] Preferably, when the coils in two adjacent windings are energized, the directions of the currents are the same.

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

[0011] Preferably, 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 with each other; the solenoids in the same winding are 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 clamp is fixedly connected to the clamp.

[0012] Preferably, the extending portions of one of the claw poles in the same winding both extend to between the two extending portions of another claw pole.

[0013] 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.

[0014] Preferably, each of the clamping plates is embedded 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.

[0015] Compared with the related art, the stepper motor in the present invention arranges at least two solenoids containing coils in each winding, and arranges the solenoids at intervals on opposite sides of the magnetic steel along the circumferential direction of the rotating shaft, and also makes the axes of the coils in each winding that are arranged opposite to each other along the axial direction of the rotating shaft overlap with each other, so that the axis of each coil does not overlap with the axis of the stepper motor. Accordingly, the width dimension of the stepper motor along the direction 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 on 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

[0016] 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. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which: Figure 1 A schematic diagram of the three-dimensional structure of a stepping motor provided by an embodiment of the present invention; Figure 2 A partial structural exploded view of a stepping motor provided by an embodiment of the present invention; Figure 3 for Figure 1 AA line section view; Figure 4 A schematic diagram of magnetic poles and current directions of a single winding of a stepping motor provided by an embodiment of the present invention; Figure 5 A schematic diagram of magnetic poles and current directions of two adjacent windings of a stepper motor provided by an embodiment of the present invention.

[0017] Among them, 100, stepper motor; 1, rotating shaft; 2, magnetic steel; 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

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0019] 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 whose two ends are respectively supported on the two clamping plates 3 and form a rotation connection, a magnetic steel 2 sleeved and fixed on the outer peripheral side of the rotating shaft 1, and a stator unit sleeved on the rotating shaft 1.

[0020] The magnetic steels 2 include a plurality of them, and the plurality of 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.

[0021] Each clamping plate 3 is embedded and fixed with a 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 with the rotating shaft 1. In other words, the bearing 31 is rotatably connected with the rotating shaft 1, and the clamping plates 3 are fixed to the outer peripheral side of the bearing 31.

[0022] 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.

[0023] Each winding 4 includes two claw poles 41 sleeved on the rotating shaft 1 and arranged opposite to each other, and at least two solenoids 42 fixed between the two claw poles 41 and spaced from each other, and the solenoids 42 are spaced and arranged on opposite sides of the magnetic steel 2 along the circumferential direction of the rotating shaft 1. In this embodiment, each winding 4 includes two solenoids 42, which are symmetrically arranged on opposite sides of the magnetic steel 2. Of course, according to actual needs, each winding 4 can also include four solenoids 42, in which case, every two solenoids 42 are arranged on one side of the magnetic steel 2; or each winding 4 can also include six solenoids 42, in which case, every three solenoids 42 are arranged on one side of the magnetic steel 2.

[0024] Each claw pole 41 includes an annular fixing portion 411 and a plurality of extension portions 412 formed by the inner circumference of the fixing portion 411 extending along the axial direction of the rotating shaft 1, and the plurality of extension portions 412 are arranged at intervals; the extension portions 412 of one claw pole 41 in the same winding 4 all extend in a direction close to the other claw pole 41, and the extension portions 412 of the two claw poles 41 are arranged alternately with each other; the solenoids 42 in the same winding 4 are all fixed between the fixing portions 411 of the two claw poles 41, and are respectively arranged at intervals with the extension portions 412 of the two claw poles 41, the fixing portions 411 of the two claw poles 41 close to each other in two adjacent windings 4 are fixedly connected, and the fixing portion 411 of the claw pole 41 close to the clamping plate 3 is fixedly connected to the clamping plate 3.

[0025] The extending portion 412 of one claw pole 41 in the same winding 4 extends to between two extending portions 412 of another claw pole 41 .

[0026] Each solenoid 42 includes an iron core 421 fixed between 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 parts 411 of the two claw poles 41, and the axes of the coils 422 arranged opposite to each other along the axial direction of the rotating shaft 1 in each winding 4 coincide with each other.

[0027] The two claw poles 41 close to each other in two adjacent windings 4 are fixedly connected; the claw pole 41 close to the clamping plate 3 is fixedly connected to the clamping plate 3. It is equivalent to that the two adjacent windings 4 are fixedly connected, and the two outer windings 4 are respectively fixedly connected to the two clamping plates 3. Because the clamping plate 3 is sleeved on the rotating shaft 1 and is rotatably connected to the rotating shaft 1, the claw pole 41 in each winding 4 is indirectly sleeved on the rotating shaft 1 through the clamping plate 3 and is rotatably connected to the rotating shaft 1.

[0028] 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 N pole and the S pole, respectively, and 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 close to the N pole of the solenoid 42 is the N pole, and the claw pole 41 close to the S pole of the solenoid 42 is the S pole, as shown in FIG. Figure 4 shown.

[0029] When alternating current is passed through the coils 422 of the two solenoids 42 in each winding 4 , the magnetic poles of the two claw poles 41 are alternating, that is, the claw poles 41 are alternating between N poles and S poles, thereby realizing the rotation of the stepper motor 100 .

[0030] When the coils 422 of the solenoids 42 in two adjacent windings 4 are energized, the directions of the currents are the same. 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. At this time, the magnetic poles generated by the solenoids 42 are opposite, so that the electromagnetic field of the windings 4 is not prone to magnetic field short circuit.

[0031] Compared with the related art, the stepper motor 100 in this embodiment is configured to have at least two solenoids 42 including coils 422 in each winding 4, and the solenoids 42 are arranged at intervals on opposite sides of the magnetic steel 2 along the circumferential direction of the rotating shaft 1, and 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 overlapped with each other, so that the axis of each coil 422 does not overlap with the axis of the stepper motor 100, and accordingly, the width dimension of the stepper motor 100 perpendicular to its axial direction is not limited by the linear The thickness of the coil 422 can be increased, 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, provided that the overall width of the stepper motor 100 is smaller than the total width of a plurality of windings 4 placed side by side. At the same time, the stepper motor 100 in this embodiment is simpler to use and has a lower cost than the stepper motor in the related art.

[0032] The above description is only an implementation mode of the present invention. It should be pointed out that, for ordinary technicians in this field, improvements can be made without departing from the creative concept of the present invention, but these all belong to the protection scope 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 which 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 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 which are arranged opposite to each other along the axial direction of the rotating shaft in each winding coincide with each other, the two claw poles which are 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.

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 stepper motor according to claim 1, characterized in that: 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 with each other; the solenoids in the same winding are 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 clamping plate is fixedly connected to the clamping plate.

6. The stepping motor according to claim 5, 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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