Stepping motor

Abstract

The invention provides a stepping motor. The stepping motor comprises two clamping plates which are oppositely arranged, a rotating shaft which is supported on the two clamping plates, magnetic steel which is fixed on the rotating shaft, and a stator unit which is arranged on the magnetic steel, the stator unit comprises a stator arranged on the magnetic steel; the stator comprises two claw poles sleeved on the rotating shaft, a first connecting plate and a second connecting plate which are respectively fixed on the two claw poles, and a solenoid fixed between the first connecting plate and the second connecting plate; the solenoid comprises an iron core clamped between the first connecting plate and the second connecting plate and a coil wound on the iron core; the solenoids comprise a first solenoid and a second solenoid; the output gear is fixed on the rotating shaft in a sleeving manner; the two first rotating shafts are supported on one clamping plate; and the transmission gear is fixed on the first rotating shafts in a sleeving manner. According to the stepping motor, the width size of the stepping motor can be further reduced, the thinnest design of the stepping motor is achieved, and meanwhile the single output form of the stepping motor is converted into the double-output-shaft form.

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, stepper motors can be divided into single-stator structures and multi-stator structures according to the number of their stators. The stepper motor with a stator structure includes a rotating shaft, a magnet fixed to the outer peripheral side of the rotating shaft, and a stator sleeved on the rotating shaft and rotatingly connected with the rotating shaft; wherein the stator includes two claw poles and a coil sleeved on the outer peripheral side of the claw poles.

[0004] The axis of the coil in the stepper motor with the above-mentioned stator structure coincides with the axis of the stepper motor, which means that the width dimension of the stepper motor with the stator structure along the direction 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. This makes it difficult to further reduce the width dimension of the stepper motor with the stator structure. In addition, the stepper motor with the above-mentioned stator structure only has a single rotating shaft, so it can only have a single output when in use.

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

[0006] The purpose of the present invention is to provide a new stepper motor to solve the problem that the stator structure of the stepper motor in the related art is difficult to further reduce its width and can only perform a single output.

[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 supported between the two clamping plates and rotatably connected with the clamping plates, a magnetic steel sleeved and fixed on the outer peripheral side of the rotating shaft, and a stator unit arranged at intervals on the peripheral side of the magnetic steel and used to drive the rotating shaft to rotate, wherein the two clamping plates are arranged at intervals on the peripheral side of the magnetic steel along the axial direction of the rotating shaft; the stator unit comprises a stator arranged at intervals on the peripheral side of the magnetic steel;

[0008] The stator comprises two claw poles sleeved on the rotating shaft and arranged relatively at intervals, a first connecting plate fixed to one of the claw poles, a second connecting plate fixed to the other claw pole, and a solenoid sandwiched between the first connecting plate and the second connecting plate; the solenoids each comprise an iron core sandwiched between the first connecting plate and the second connecting plate, and a coil wound around the outer circumference of the iron core and spaced from the claw poles, wherein the winding direction of the coil is parallel to the axial direction of the rotating shaft; the solenoid comprises a first solenoid and a second solenoid arranged at opposite sides of the claw poles at intervals along the radial direction of the rotating shaft;

[0009] The stepper motor also includes an output gear sleeved and fixed on the output end of the rotating shaft, two first rotating shafts supported on one of the clamping plates and rotatingly connected, and transmission gears respectively sleeved and fixed on the two first rotating shafts and respectively meshing with the output gear, and the two transmission gears are respectively located on opposite sides of the output gear along the radial direction of the rotating shaft.

[0010] Preferably, the stator unit includes a plurality of stators, and the plurality of stators are stacked in sequence along the axial direction of the rotating shaft, the coils of the first solenoids of the plurality of stators are coaxially arranged, and the coils of the second solenoids of the plurality of stators are coaxially arranged; the claw poles close to the clamping plate are fixedly connected with the clamping plate.

[0011] Preferably, the two transmission gears are respectively arranged opposite to the first solenoid and the second solenoid along the axial direction of the rotating shaft.

[0012] Preferably, each of the transmission gears comprises a first gear meshing with the output gear and a second gear protruding and extending from the center of one side of the first gear away from the clamping plate.

[0013] Preferably, the current directions of the two coils of the same stator are the same or opposite; the current directions of the coils of adjacent stators are opposite.

[0014] Preferably, the first connecting plate and the second connecting plate in the same stator are both integrally formed with the iron core.

[0015] Preferably, each of the claw poles includes an annular fixing portion and a plurality of pole claws formed by the inner circumference of the fixing portion extending along the axial direction of the rotating shaft, and the plurality of pole claws are arranged at intervals; the pole claws of one of the claw poles in the same stator extend in a direction close to the other claw pole, and the pole claws of the two claw poles are arranged alternately with each other; the first connecting plate and the second connecting plate in the same stator are respectively fixed to the fixing portions of the corresponding claw poles, the fixing portions of the two claw poles close to each other in two adjacent stators form a fixed connection, and the fixing portion of the claw pole close to the clamping plate forms a fixed connection with the clamping plate.

[0016] Preferably, the first connecting plate of the same stator and the fixing portion of the corresponding claw pole are integrally formed; and the second connecting plate of the same stator and the fixing portion of the corresponding claw pole are integrally formed.

[0017] Preferably, the pole claws of one of the claw poles in the same stator both extend between the two pole claws of another claw pole.

[0018] Compared with the related art, the stepper motor in the present invention arranges the first solenoid and the second solenoid in the solenoid to be arranged at opposite sides of the claw pole at intervals along the radial direction of the rotating shaft, so that the axis of the coil in the solenoid 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; at the same time, by utilizing the reduction in the width dimension of the stepper motor, the thickness of the coil can be adjusted to further improve the torque performance of the stepper motor; in addition, by utilizing the two first rotating shafts added to one of the splints and engaging them with the output gear of the rotating shaft through the transmission gear, the single output form of the stepper motor can be converted into a dual output shaft form. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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:

[0020] Figure 1 A schematic diagram of the three-dimensional structure of a stepping motor provided in an embodiment of the present invention;

[0021] Figure 2 A partial structural exploded view of a stepping motor provided in an embodiment of the present invention;

[0022] Figure 3 For along Figure 1 A cross-sectional view of the AA line;

[0023] Figure 4 A schematic diagram of the magnetic poles and current direction of a stepper motor provided in an embodiment of the present invention.

[0024] Among them, 100, stepper motor; 1, clamp; 11, bearing; 12, first bearing; 2, rotating shaft; 3, magnet; 4, stator; 41, claw pole; 411, fixing part; 412, pole claw; 42, first connecting plate; 43, second connecting plate; 44, solenoid; 441, iron core; 442, coil; 44a, first solenoid; 44b, second solenoid; 5, output gear; 6, first rotating shaft; 7, transmission gear; 71, first gear; 72, second gear. DETAILED DESCRIPTION

[0025] 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.

[0026] Embodiment 1

[0027] The embodiment of the present invention provides a stepping motor 100, Figures 1 to 3 As shown, it includes two clamping plates 1 arranged opposite to each other, a rotating shaft 2 supported between the two clamping plates 1 and rotatingly connected with the clamping plates 1, a magnetic steel 3 sleeved and fixed on the outer peripheral side of the rotating shaft 2, and a stator unit arranged at intervals on the peripheral side of the magnetic steel and used to drive the rotating shaft 2 to rotate. The two clamping plates 1 are arranged at intervals from the magnetic steel 3 along the axial direction of the rotating shaft 2.

[0028] Each of the splints 1 can be designed as a single splint 1 or a stacked multi-layer splint 1. In this embodiment, each of the splints 1 is a double-layer splint 1, and one of the splints 1 is not shown.

[0029] A bearing 11 is embedded and fixed in each clamping plate 1 , and two ends of the rotating shaft 2 are rotationally connected with the two clamping plates 1 through two bearings 11 .

[0030] The magnetic steel 3 can be designed as a single annular magnetic steel 3 or as a plurality of magnetic steels 3 , in which case the plurality of magnetic steels 3 are arranged around the rotating shaft 2 and are all fixed to the outer peripheral side of the rotating shaft 2 ; in this embodiment, the magnetic steels 3 include eight.

[0031] Specifically, the stator unit includes a stator 4 that is spaced apart on the circumferential side of the magnetic steel 3; the stator 4 includes two claw poles 41 that are sleeved on the rotating shaft 2 and spaced apart relatively along the axial direction of the rotating shaft 2, a first connecting plate 42 fixed to one of the claw poles 41, a second connecting plate 43 fixed to the other claw pole 41, and a solenoid 44 sandwiched between the first connecting plate 42 and the second connecting plate 43.

[0032] The solenoid 44 includes an iron core 441 sandwiched between the first connecting plate 42 and the second connecting plate 43, and a coil 442 wound around the outer circumference of the iron core 441 and spaced apart from the claw pole 41; the winding direction of the coil 442 is parallel to the axial direction of the rotating shaft 2; the solenoid 44 includes a first solenoid 44a and a second solenoid 44b arranged at opposite sides of the claw pole along the radial direction of the rotating shaft 2.

[0033] According to actual needs, the stator unit may include one stator 4 or multiple stators 4. If the stator unit includes multiple stators 4, the multiple stators 4 are stacked in sequence along the axial direction of the rotating shaft 2, the coils 442 of the first solenoids 44a of the multiple stators 4 are coaxially arranged, and the coils 442 of the second solenoids 44b of the multiple stators 4 are coaxially arranged.

[0034] In this embodiment, the stator unit includes four stators 4. Since the plurality of stators 4 are stacked in sequence along the axial direction of the rotating shaft 2, the claw poles 41 of one adjacent stator 4 are fixedly connected with the claw poles 41 of another adjacent stator 4, and the second connecting plate 43 of one adjacent stator 4 is integrally formed with the first connecting plate 42 of another adjacent stator 4. Of course, the second connecting plate 43 of one adjacent stator 4 and the first connecting plate 42 of another adjacent stator 4 may not be integrally formed, but only need to be fixedly connected.

[0035] Each claw pole 41 includes an annular fixing portion 411 and a plurality of pole claws 412 formed by the inner periphery of the fixing portion 411 extending along the axial direction of the rotating shaft 2, and the plurality of pole claws 412 are arranged at intervals; the pole claws 412 of one claw pole 41 in the same stator 4 extend toward the direction close to the other claw pole 41, and the pole claws 412 of the two claw poles 41 are arranged alternately; the first connecting plate 42 and the second connecting plate 43 in the same stator 4 are respectively fixed to the fixing portion 411 of the corresponding claw pole 41, and the fixing portions 411 of the two claw poles 41 close to each other in the two adjacent stators 4 form a fixed connection, and the fixing portion 411 of the claw pole 41 close to the clamping plate 1 forms a fixed connection with the clamping plate 1. In this embodiment, each claw pole 41 includes four pole claws 412.

[0036] The pole claws 412 of one claw pole 41 in the same stator 4 all extend between the two pole claws 412 of another claw pole 41 .

[0037] The first connecting plate 42 and the second connecting plate 43 in the same stator 4 are both integrally formed with the iron core 441. This design can improve the stability when the first connecting plate 42 and the second connecting plate 43 are connected to the iron core 441 respectively.

[0038] The first connecting plate 42 of the same stator 4 is fixedly connected to the fixing portion 411 of the corresponding claw pole 41 ; the second connecting plate 42 of the same stator 4 is fixedly connected to the fixing portion 411 of the corresponding claw pole 41 .

[0039] Since the solenoid 44 includes a first solenoid 44a and a second solenoid 44b and are respectively arranged on opposite sides of the claw pole 41, the first connecting plate 42 and the second connecting plate 43 in the same stator 4 each include two and are respectively fixed on opposite sides of the corresponding claw pole 41. Accordingly, one of the first connecting plates 42 and one of the second connecting plates 43 are integrally formed with the iron core 441 of the first solenoid 44a, and the other first connecting plate 42 and the other second connecting plate 43 are integrally formed with the iron core 441 of the second solenoid 44b.

[0040] The current directions of the two coils 442 in the same stator 4 are the same, and the current directions of the coils 442 of the adjacent stators 4 are opposite, such as Figure 4 Of course, the current directions of the two coils 442 in the same stator 4 can also be opposite, and in this case, the magnetic poles generated by the solenoid 44 are opposite, so that the electromagnetic field of the stator 4 is not prone to magnetic field short circuit.

[0041] When the coils 442 of the first solenoid 44a and the second solenoid 44b in each stator 4 are energized, the two ends of the first solenoid 44a and the second solenoid 44b after polarization are opposite magnetic poles, the same ends of the first solenoid 44a and the second solenoid 44b after polarization are the same magnetic poles, and the claw poles 41 at the same ends as the first solenoid 44a and the second solenoid 44b are polarized. Specifically, when the coils 442 of the first solenoid 44a and the second solenoid 44b in each stator 4 are energized, the two ends of the first solenoid 44a and the second solenoid 44b are polarized to be N poles and S poles, respectively, and the same ends of the first solenoid 44a and the second solenoid 44b are polarized to be the same magnetic poles, and the claw poles 41 at the same ends as the first solenoid 44a and the second solenoid 44b are polarized, so that the claw poles 41 close to the N poles of the solenoids 44 are N poles, and the claw poles 41 close to the S poles of the solenoids 44 are S poles, as shown in FIG. Figure 4 shown.

[0042] When alternating current is passed through the coils 442 of the first solenoid 44 a and the second solenoid 44 b in each stator 4 , the magnetic poles of the two claw poles 41 are alternating, that is, the claw poles 41 are alternating between the N pole and the S pole, thereby realizing the rotation of the stepping motor 100 .

[0043] Specifically, the stepper motor 100 also includes an output gear 5 mounted on the output end of the rotating shaft 2, two first rotating shafts 6 supported on one of the clamping plates 1 and forming a rotational connection, and transmission gears 7 respectively mounted on the two first rotating shafts 6 and meshing with the respective output gears 5, and the two transmission gears 7 are respectively located on opposite sides of the output gear 5 along the radial direction of the rotating shaft 2.

[0044] The radial directions of the two first rotating shafts 6 are respectively arranged parallel to the radial direction of the rotating shaft 2 .

[0045] The diameter of each transmission gear 7 is smaller than the width of the corresponding clamping plate 1 . This design ensures that the two additional transmission gears 7 will not increase the width of the stepping motor 100 .

[0046] The two transmission gears 7 are respectively arranged opposite to the first solenoid 44 a and the second solenoid 44 b along the axial direction of the rotating shaft 2 . Such a design can further ensure that the two additional transmission gears 7 will not increase the width dimension of the stepping motor 100 .

[0047] The transmission gear 7 includes a first gear 71 meshing with the output gear 5 and a second gear 72 formed by extending and protruding from the center of the first gear 71 away from the clamping plate 1. This design can make the transmission gear 7 more stably connected to the device to be driven.

[0048] One end of the rotating shaft 2 is a semicircular structure end, and the output gear 5 is fixed to the semicircular structure end. This design can make the output gear 5 more stably fixed to the rotating shaft 2; one end of the first rotating shaft 6 is a first semicircular structure end, and the first gear 71 is fixed to the first semicircular structure end. This design can make the transmission gear 7 more stably fixed to the first rotating shaft 6.

[0049] One of the clamping plates 1 is embedded and fixed with two first bearings 12 spaced apart from each other, and the two first rotating shafts 6 are rotationally connected to the clamping plate 1 through the two first bearings 12 respectively; equivalently, one first rotating shaft 6 is rotationally connected to the clamping plate 1 through a corresponding first bearing 12 respectively.

[0050] Compared with the related art, the stepper motor 100 in the present embodiment arranges the first solenoid 44a and the second solenoid 44b in the solenoid 44 to be arranged at intervals on opposite sides of the claw pole 41 along the radial direction of the rotating shaft 2, and also makes the axes of the coils 422 arranged in each stator 4 along the axial direction of the rotating shaft 2 coincide with each other, so that the axis of the coil 442 in the solenoid 44 does not coincide with the axis of the stepper motor 100, and accordingly, the width dimension of the stepper motor 100 perpendicular to its axial direction will not be limited by the coil 422. The thickness of the coil 422 can be further reduced, thereby further reducing the width of the stepper motor 100 and realizing the thinnest design of the stepper motor 100; at the same time, by reducing the width of the stepper motor 100, the thickness of the coil 422 can be adjusted to further improve the torque performance of the stepper motor 100; in addition, by utilizing the two first rotating shafts 6 added to one of the splints 1 and engaging them with the output gear 5 of the rotating shaft 2 through the transmission gear 7, the single output form of the stepper motor 100 can be converted into a dual output shaft form.

[0051] Embodiment 2

[0052] The present embodiment is different from the above-mentioned embodiment 1 in that the first connecting plate 42 of the same stator 4 is integrally formed with the fixing portion 411 of the corresponding claw pole 41; the second connecting plate 43 of the same stator 4 is integrally formed with the fixing portion 411 of the corresponding claw pole 41. This design can improve the stability when the first connecting plate 42 and the second connecting plate 43 are respectively connected to the corresponding claw pole 41.

[0053] Since the solenoid 44 includes a first solenoid 44a and a second solenoid 44b and are respectively arranged on opposite sides of the claw pole 41, the first connecting plate 42 and the second connecting plate 43 in the same stator 4 each include two, and accordingly, the two first connecting plates 42 in the same stator 4 are respectively integrally formed with the corresponding fixing portion 411 of the claw pole 41, and the two second connecting plates 43 in the same stator 4 are respectively integrally formed with the corresponding fixing portion 411 of the claw pole 41.

[0054] 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 stepper motor, comprising two clamping plates arranged opposite to each other, a rotating shaft supported between the two clamping plates and rotatably connected to the clamping plates, a magnetic steel sleeved and fixed on the outer peripheral side of the rotating shaft, and a stator unit arranged at intervals on the peripheral side of the magnetic steel and used to drive the rotating shaft to rotate, wherein the two clamping plates are arranged at intervals on the peripheral side of the magnetic steel along the axial direction of the rotating shaft; the stator unit comprises a stator arranged at intervals on the peripheral side of the magnetic steel; characterized in that: The stator comprises two claw poles arranged relatively spaced apart along the axial direction of the rotating shaft, a first connecting plate fixed to one of the claw poles, a second connecting plate fixed to the other claw pole, and a solenoid sandwiched between the first connecting plate and the second connecting plate; the solenoid comprises an iron core sandwiched between the first connecting plate and the second connecting plate, and a coil wound around the outer circumference of the iron core and spaced apart from the claw poles, wherein the winding direction of the coil is parallel to the axial direction of the rotating shaft; the solenoid comprises a first solenoid and a second solenoid arranged at opposite sides of the claw poles at intervals along the radial direction of the rotating shaft; The stepper motor also includes an output gear sleeved and fixed on the output end of the rotating shaft, two first rotating shafts supported on one of the clamping plates and rotatingly connected, and transmission gears respectively sleeved and fixed on the two first rotating shafts and respectively meshing with the output gear, and the two transmission gears are respectively located on opposite sides of the output gear along the radial direction of the rotating shaft.

2. The stepper motor according to claim 1, characterized in that: The stator unit includes a plurality of stators, which are stacked in sequence along the axial direction of the rotating shaft, the coils of the first solenoids of the plurality of stators are coaxially arranged, and the coils of the second solenoids of the plurality of stators are coaxially arranged.

3. The stepper motor according to claim 1, characterized in that: The two transmission gears are respectively arranged opposite to the first solenoid and the second solenoid along the axial direction of the rotating shaft.

4. The stepper motor according to claim 1, characterized in that: Each of the transmission gears includes a first gear meshed with the output gear and a second gear formed by protruding and extending from the center of a side of the first gear away from the clamping plate.

5. The stepping motor according to claim 2, characterized in that: The current directions of the two coils of the same stator are the same or opposite; the current directions of the coils of adjacent stators are opposite.

6. The stepping motor according to claim 2, characterized in that: The first connecting plate and the second connecting plate in the same stator are both integrally formed with the iron core.

7. The stepper motor according to claim 2, characterized in that: Each of the claw poles includes an annular fixing portion and a plurality of pole claws formed by the inner circumference of the fixing portion extending along the axial direction of the rotating shaft, and the plurality of pole claws are arranged at intervals; the pole claws of one of the claw poles in the same stator extend in a direction close to the other claw pole, and the pole claws of the two claw poles are arranged alternately; the first connecting plate and the second connecting plate in the same stator are respectively fixed to the fixing portions of the corresponding claw poles, the fixing portions of the two claw poles close to each other in two adjacent stators form a fixed connection, and the fixing portion of the claw pole close to the clamping plate forms a fixed connection with the clamping plate.

8. The stepping motor according to claim 7, characterized in that: The first connecting plate of the same stator is integrally formed with the fixing portion of the corresponding claw pole; the second connecting plate of the same stator is integrally formed with the fixing portion of the corresponding claw pole.

9. The stepping motor according to claim 7, characterized in that: The pole claws of one of the claw poles in the same stator both extend between the two pole claws of another claw pole.

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