stepper motor

Abstract

The application provides a stepping motor, which comprises two clamping plates arranged oppositely, a rotating shaft supported by the two clamping plates, a magnetic steel fixed to the rotating shaft and a stator unit 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 fixed to the two claw poles respectively 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 solenoid comprises a first solenoid and a second solenoid; the application further comprises an output gear sleeved and fixed to the rotating shaft, two first rotating shafts supported by one of the clamping plates and a transmission gear sleeved and fixed to the first rotating shafts. The stepping motor in the application can be further reduced in width to realize the thinnest design of the stepping motor, and the single output form of the stepping motor is converted into a double-output-shaft form.

Description

TECHNICAL FIELD

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

[0002] The stepping motor has been widely applied in the fields of electric motors and generators due to its high work efficiency and energy saving.

[0003] In the related art, the stepping motor can be divided into single-stator structure and multi-stator structure according to the number of stators of the stepping motor. The stepping motor with single-stator structure comprises a rotating shaft, a magnetic steel fixed to the outer circumferential side of the rotating shaft, and a stator sleeved on the rotating shaft and in rotational connection with the rotating shaft. The stator comprises two claw poles and a coil sleeved on the outer circumferential side of the claw poles.

[0004] In the stepping motor with single-stator structure, the axis of the coil coincides with the axis of the stepping motor. In other words, the width dimension of the stepping motor with single-stator structure is 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 stepping motor with single-stator structure. In addition, the stepping motor with single-stator structure only has a single rotating shaft, so it can only perform single output during use.

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

[0006] The present application aims to provide a new stepping motor to solve the problems that the stepping motor with single-stator structure in the related art is difficult to further reduce its width dimension and can only perform single output.

[0007] To achieve the above-mentioned purpose, the present application provides a stepping motor, which comprises two clamping plates arranged oppositely, a rotating shaft supported between the two clamping plates and in rotational connection with the clamping plates, a magnetic steel sleeved and fixed to the outer circumferential side of the rotating shaft, and a stator unit arranged at intervals on the circumferential side of the magnetic steel and used for driving the rotating shaft to rotate. The two clamping plates are arranged at intervals with the magnetic steel along the axial direction of the rotating shaft. The stator unit comprises a stator arranged at intervals on the circumferential side of the magnetic steel.

[0008] The stator comprises two claw poles sleeved on the rotating shaft and oppositely arranged, a first connecting plate fixed to one of the claw poles, a second connecting plate fixed to the other claw pole, and a solenoid clamped between the first connecting plate and the second connecting plate; the solenoid comprises a core clamped between the first connecting plate and the second connecting plate, and a coil wound on the outer circumferential side of the core and oppositely arranged with the claw poles, the winding direction of the coil being parallel to the axial direction of the rotating shaft; the solenoid comprises a first solenoid and a second solenoid oppositely arranged on the opposite sides of the claw poles along the radial direction of the rotating shaft.

[0009] The stepping motor further comprises an output gear sleeved and fixed to the output end of the rotating shaft, two first rotating shafts supported on one of the clamping plates and rotationally connected, and two transmission gears respectively sleeved and fixed to the two first rotating shafts and respectively engaged with the output gear, the two transmission gears being respectively located on the opposite sides of the output gear along the radial direction of the rotating shaft.

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

[0011] Preferably, the two transmission gears are oppositely arranged with 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 engaged with the output gear, and a second gear protruding and extending from the center 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 integrally formed with the core.

[0015] Preferably, each claw pole includes an annular fixing part and a plurality of claws formed by the inner periphery of the fixing part extending axially along the rotating shaft, and the plurality of claws are spaced apart; the claws of one claw pole in the same stator extend toward the other claw pole, and the 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 part of the corresponding claw pole, the fixing parts of two claw poles that are close to each other in two adjacent stators are fixedly connected, and the fixing part of the claw pole that is close to the clamping plate is fixedly connected to the clamping plate.

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

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

[0018] Compared with related technologies, the stepper motor in this invention arranges the first and second solenoids in the solenoid at radial intervals along the shaft on opposite sides of the claw pole. This prevents the axis of the coil in the solenoid from coinciding with the axis of the stepper motor. Consequently, the width of the stepper motor perpendicular to its axial direction is not limited by the thickness of the coil, thereby further reducing the width of the stepper motor and achieving the thinnest design. At the same time, by reducing the width of the stepper motor, the torque performance of the stepper motor can be further improved by adjusting the thickness of the coil. In addition, by using two first shafts added to one of the clamps and having them mesh with the output gear of the shaft through a transmission gear, the single output form of the stepper motor can be converted into a dual output shaft form. Attached Figure Description

[0019] 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:

[0020] Figure 1 This is a three-dimensional structural diagram of a stepper motor provided in an embodiment of the present invention;

[0021] Figure 2 This is an exploded view of a portion of the structure of a stepper motor provided in an embodiment of the present invention;

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

[0023] Figure 4 This is 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 is a stepper motor; 1 is a clamping plate; 11 is a bearing; 12 is a first bearing; 2 is a rotating shaft; 3 is a magnet; 4 is a stator; 41 is a claw pole; 411 is a fixing part; 412 is a pole claw; 42 is a first connecting plate; 43 is a second connecting plate; 44 is a solenoid; 441 is an iron core; 442 is a coil; 44a is a first solenoid; 44b is a second solenoid; 5 is an output gear; 6 is a first rotating shaft; 7 is a transmission gear; 71 is a first gear; 72 is a second gear. Detailed Implementation

[0025] 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.

[0026] Example 1

[0027] This invention provides a stepper motor 100, combined with... 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 rotatably connected to the clamping plates 1, a magnet 3 sleeved and fixed on the outer periphery of the rotating shaft 2, and a stator unit spaced apart on the periphery of the magnet and used to drive the rotating shaft 2 to rotate. The two clamping plates 1 are spaced apart from the magnet 3 along the axial direction of the rotating shaft 2.

[0028] Each clamping plate 1 can be designed as a single clamping plate 1 or as multiple stacked clamping plates 1. In this embodiment, each clamping plate 1 is a double-layer clamping plate 1, and one of the clamping plates 1 is not shown in the figure.

[0029] Each clamping plate 1 is embedded with a fixed bearing 11, and the two ends of the rotating shaft 2 are respectively connected to the two clamping plates 1 through two bearings 11 to form a rotatable connection.

[0030] The magnet 3 can be designed as a single ring magnet 3 or multiple magnets 3, in which case multiple magnets 3 are arranged around the rotating shaft 2 and are all fixed to the outer periphery of the rotating shaft 2; in this embodiment, there are eight magnets 3.

[0031] Specifically, the stator unit includes a stator 4 spaced apart on the periphery of the magnet 3; the stator 4 includes two claw poles 41 sleeved on the rotating shaft 2 and spaced apart from each other 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 periphery 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 radially at intervals on opposite sides of the claw pole along the rotating shaft 2.

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

[0034] In this embodiment, the stator unit includes four stators 4. Since the multiple stators 4 are stacked sequentially along the axial direction of the shaft 2, the claw pole 41 of one adjacent stator 4 is fixedly connected to the claw pole 41 of another stator 4, and the second connecting plate 43 of one adjacent stator 4 is integrally formed with the first connecting plate 42 of another stator 4. Of course, the second connecting plate 43 of one adjacent stator 4 and the first connecting plate 42 of another stator 4 do not necessarily have to be integrally formed; a fixed connection is sufficient.

[0035] Each claw pole 41 includes an annular fixing part 411 and multiple claws 412 formed by extending the inner periphery of the fixing part 411 along the axial direction of the rotating shaft 2. The multiple claws 412 are spaced apart. The claws 412 of one claw pole 41 in the same stator 4 extend towards the other claw pole 41, and the 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 part 411 of the corresponding claw pole 41. The fixing parts 411 of two claw poles 41 that are close to each other in two adjacent stators 4 are fixedly connected. The fixing part 411 of the claw pole 41 that is close to the clamping plate 1 is fixedly connected to the clamping plate 1. In this embodiment, each claw pole 41 includes four claws 412.

[0036] In the same stator 4, the claw 412 of one of the claw poles 41 extends between the two claws 412 of the other claw pole 41.

[0037] In the same stator 4, the first connecting plate 42 and the second connecting plate 43 are 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 part 411 of the corresponding claw pole 41; the second connecting plate 42 of the same stator 4 is fixedly connected to the fixing part 411 of the corresponding claw pole 41.

[0039] Since the solenoid 44 includes a first solenoid 44a and a second solenoid 44b, which are respectively disposed 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 in the two coils 442 within the same stator 4 flows in the same direction, and the current in the coils 442 of adjacent stator 4 flows in opposite directions, such as... Figure 4 As shown. Of course, the current directions of the two coils 442 in the same stator 4 can also be opposite. In this case, the magnetic poles generated by the solenoid 44 are opposite, which makes it less likely for the electromagnetic field of the stator 4 to produce a magnetic field short circuit.

[0041] When the coil 442 of the first solenoid 44a and the second solenoid 44b in each stator 4 is energized, the two ends of the first solenoid 44a and the second solenoid 44b after polarization are opposite magnetic poles, and the same end of the first solenoid 44a and the second solenoid 44b after polarization are the same magnetic pole, and the claw pole 41 at the same end as the first solenoid 44a and the second solenoid 44b is 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 as N pole and S pole, respectively. The same end of the first solenoid 44a and the second solenoid 44b after polarization has the same magnetic pole, and the claw pole 41 at the same end as the first solenoid 44a and the second solenoid 44b is polarized. This ensures that the claw pole 41 closest to the N pole of the solenoid 44 is the N pole, and the claw pole 41 closest to the S pole of the solenoid 44 is the S pole. Figure 4 As shown.

[0042] When the coils 442 of the first solenoid 44a and the second solenoid 44b in each stator 4 are energized with alternating current, the magnetic poles of the two claw poles 41 alternate, so that the claw poles 41 alternate between N and S poles, thereby realizing the rotation of the stepper motor 100.

[0043] Specifically, the stepper motor 100 also includes an output gear 5 fixed to the output end of the rotating shaft 2, two first rotating shafts 6 supported on one of the clamping plates 1 and forming a rotatable connection, and transmission gears 7 respectively fixed to the two first rotating shafts 6 and meshing with the respective output gears 5. The two transmission gears 7 are 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 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 stepper motor 100.

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

[0047] The transmission gear 7 includes a first gear 71 that meshes with the output gear 5 and a second gear 72 that extends from the center of the first gear 71 away from the clamping plate 1. This design allows the transmission gear 7 to be connected more stably to the equipment that needs to be driven.

[0048] One end of the rotating shaft 2 is a semi-circular structure end, and the output gear 5 is fixed to the semi-circular structure end. This design allows the output gear 5 to be fixed to the rotating shaft 2 more stably. One end of the first rotating shaft 6 is a first semi-circular structure end, and the first gear 71 is fixed to the first semi-circular structure end. This design allows the transmission gear 7 to be fixed to the first rotating shaft 6 more stably.

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

[0050] Compared with related technologies, the stepper motor 100 in this embodiment arranges the first solenoid 44a and the second solenoid 44b in the solenoid 44 to be arranged at intervals along the radial direction of the shaft 2 on opposite sides of the claw pole 41. Furthermore, the axes of the coils 422 in each stator 4 that are oriented opposite each other along the axial direction of the shaft 2 coincide. This ensures that the axes of the coils 442 in the solenoid 44 do not coincide with the axis of the stepper motor 100. Consequently, the width dimension of the stepper motor 100 perpendicular to its axial direction is not limited by the coils. The thickness of 422 further reduces the width of the stepper motor 100, achieving the thinnest design of the stepper motor 100. At the same time, 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. In addition, by using two first rotating shafts 6 added to one of the clamping plates 1 and having them mesh 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] Example 2

[0052] In this embodiment, unlike Embodiment 1 described above, the first connecting plate 42 of the same stator 4 is integrally formed with the fixing part 411 of the corresponding claw pole 41; the second connecting plate 43 of the same stator 4 is integrally formed with the fixing part 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 connected to the corresponding claw pole 41.

[0053] Since the solenoid 44 includes a first solenoid 44a and a second solenoid 44b, which are respectively disposed on opposite sides of the claw pole 41, there are two first connecting plates 42 and two connecting plates 43 in the same stator 4. Accordingly, the two first connecting plates 42 in the same stator 4 are integrally formed with the fixing part 411 of the corresponding claw pole 41, and the two second connecting plates 43 in the same stator 4 are integrally formed with the fixing part 411 of the corresponding claw pole 41.

[0054] 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 supported between the two clamping plates and rotatably connected to the clamping plates, a magnet sleeved and fixed to the outer periphery of the rotating shaft, and a stator unit spaced apart from the periphery of the magnet for driving the rotating shaft to rotate, wherein the two clamping plates are spaced apart from the magnet along the axial direction of the rotating shaft; the stator unit comprises stators spaced apart from the periphery of the magnet; characterized in that, The stator includes two claw poles spaced apart from each other 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 includes an iron core sandwiched between the first connecting plate and the second connecting plate, and a coil wound around the outer periphery of the iron core and spaced apart from the claw poles, the winding direction of the coil being parallel to the axial direction of the rotating shaft; the solenoid includes a first solenoid and a second solenoid arranged radially at intervals on opposite sides of the claw poles; The stepper motor further includes an output gear sleeved and fixed to the output end of the rotating shaft, two first rotating shafts supported on one of the clamping plates and forming a rotatable connection, and transmission gears respectively sleeved and fixed to the two first rotating shafts and respectively meshing with the output gear. 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 as described in claim 1, characterized in that, The stator unit includes a plurality of stators, which are stacked sequentially 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 as described in claim 1, characterized in that, The two transmission gears are respectively positioned opposite the first solenoid and the second solenoid along the axial direction of the rotating shaft.

4. The stepper motor as described in claim 1, characterized in that, Each of the transmission gears includes a first gear that meshes with the output gear and a second gear that extends from the center of the first gear on the side away from the clamping plate.

5. The stepper motor as described in 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 stepper motor as described in claim 2, characterized in that, Both the first connecting plate and the second connecting plate in the same stator are integrally formed with the iron core.

7. The stepper motor as described in claim 2, characterized in that, Each of the claw poles includes an annular fixing part and a plurality of claws formed by the inner periphery of the fixing part extending axially along the rotating shaft, the plurality of claws being spaced apart; the claws of one of the claw poles in the same stator extend toward the other claw pole, and the 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 part of the corresponding claw pole, the fixing parts of two claw poles that are close to each other in two adjacent stators are fixedly connected, and the fixing part of the claw pole that is close to the clamping plate is fixedly connected to the clamping plate.

8. The stepper motor as described in claim 7, characterized in that, The first connecting plate of the same stator is integrally formed with the fixing part of the corresponding claw pole; the second connecting plate of the same stator is integrally formed with the fixing part of the corresponding claw pole.

9. The stepper motor as described in claim 7, characterized in that, The claws of one of the claw poles in the same stator extend between the two claws of the other claw pole.

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