Stepping motor

Abstract

The invention relates to the technical field of motors, and provides a stepping motor which comprises a first cover plate, a second cover plate, a rotor assembly and a stator assembly, the rotor assembly comprises a rotating shaft and magnetic steel fixedly arranged on the rotating shaft in a sleeving mode. The stator assembly comprises a first claw pole, a second claw pole and solenoids arranged on the two opposite sides of the rotating shaft. The first claw pole and the second claw pole are respectively sleeved on the rotor assembly and are separated from the magnetic steel; the solenoid comprises an iron core and a coil fixedly sleeved on the iron core, and two opposite ends of the iron core along the axial direction of the rotating shaft are respectively fixed on the first cover plate and the second cover plate; the stepping motor further comprises a reduction gearbox assembly, the reduction gearbox assembly is fixed to the side, away from the second cover plate, of the shell, and the output end of the rotating shaft is connected with the reduction gearbox assembly. The orthographic projection of the reduction gearbox assembly to the first cover plate completely falls into the range of the first cover plate. Compared with the prior art, the stepping motor provided by the invention can realize ultrathin design and good torque performance.

Description

Technical Field

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

[0002] A stepper motor is an electric motor that converts an electrical pulse signal into a corresponding angular displacement or linear displacement. Each time a pulse signal is input, the rotor rotates an angle or moves forward one step. The angular displacement or linear displacement output is proportional to the number of input pulses, and the speed is proportional to the pulse frequency. Therefore, stepper motors have been widely used in fields such as motors and generators due to their compact structure, high power density, high working efficiency, and significant energy-saving and consumption-reducing benefits. In recent years, the industrial field has an increasingly urgent demand for equipment that uses stepper motors to directly drive loads. The widespread use of these stepper motor direct-drive equipment will produce immeasurable energy-saving benefits.

[0003] In the related art, the existing stepper motor generally includes a housing, a rotor rotatably arranged in the housing, and a stator sleeved on the outer peripheral side of the rotor. The stator is fixed to the housing and coaxially arranged with the rotor. The stator includes a claw pole and a coil sleeved on the claw pole. The claw pole is sleeved on the rotor so that the coil coincides with the axis of the rotor, and the rotor is driven to rotate by energizing the coil. However, the radial size of the motor is limited by the wall thickness of the coil, the thickness of the claw pole and the thickness of the magnetic steel, and it is difficult to further reduce it. At the same time, when the thickness of the motor is small, the planetary gear reducer structure cannot be used, and the motor driving effect is poor. Therefore, it is necessary to provide a new stepper motor to solve the above problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a stepper motor which can realize the thinnest motor design, convenient reduction box arrangement, and realize the reduction function under the premise of ensuring stable rotation.

[0005] In order to solve the above technical problems, an embodiment of the present invention provides a stepping motor, the stepping motor comprising a first cover plate and a second cover plate arranged opposite to each other, a rotor assembly arranged between the first cover plate and the second cover plate and rotatably connected with the first cover plate and the second cover plate, and a stator assembly fixed between the first cover plate and the second cover plate, wherein the stator assembly drives the rotor assembly to rotate; The rotor assembly includes a rotating shaft and a magnetic steel sleeved and fixed on the rotating shaft, and two ends of the rotating shaft are respectively rotatably connected with the first cover plate and the second cover plate; The stator assembly includes a first claw pole fixed to a side of the first cover plate close to the second cover plate, a second claw pole fixed to a side of the second cover plate close to the first cover plate, and a solenoid arranged on opposite sides of the rotating shaft, wherein the first claw pole and the second claw pole are arranged in a corresponding manner; the first claw pole and the second claw pole are respectively sleeved on the rotor assembly and are spaced apart from the magnetic steel; The solenoid comprises an iron core and a coil sleeved and fixed on the iron core, the opposite ends of the iron core along the axial direction of the rotating shaft are respectively fixed to the first cover plate and the second cover plate, and the iron cores are symmetrically distributed on opposite sides of the rotor assembly; The stepper motor also includes a reduction box assembly, which is fixed to a side of the first cover plate away from the second cover plate, and the rotating shaft includes an output end connected to the reduction box assembly; the orthographic projection of the reduction box assembly onto the first cover plate completely falls within the range of the first cover plate.

[0006] Preferably, the reduction box assembly comprises a housing, a first gear member, a second gear member and a third gear member arranged in the housing; the first gear member and the third gear member are coaxially arranged and spaced from each other in the axial direction of the rotating shaft; the second gear member is located on one side of the first gear member; The first gear member includes a first gear and a first transmission shaft extending protrudingly from one end of the first gear away from the rotating shaft along the axis thereof and arranged parallel to the rotating shaft; The second gear member includes a first guide post arranged parallel to the rotating shaft and rotatably connected to the box body, a second gear and a third gear respectively sleeved and fixed on the first guide post, and the second gear is fixedly connected to the third gear; The third gear member includes a fourth gear and a second transmission shaft extending from one end of the fourth gear away from the first gear along its axis and arranged parallel to the rotating shaft, and the first transmission shaft is rotatably arranged with the fourth gear; The first gear is meshed with the second gear, the third gear is meshed with the fourth gear, the number of teeth of the second gear is greater than the number of teeth of the first gear, and the number of teeth of the third gear is less than the number of teeth of the fourth gear.

[0007] Preferably, the reduction gearbox assembly further comprises a fourth gear member; the fourth gear member and the second gear member are respectively located on two opposite sides of the first gear member; The fourth gear member includes a second guide column arranged parallel to the rotating shaft and rotatably connected to the box body, a fifth gear and a sixth gear respectively sleeved and fixed on the second guide column, and the fifth gear is fixedly connected to the sixth gear; the fifth gear and the second gear are respectively located on opposite sides of the first gear, and the sixth gear and the third gear are respectively located on opposite sides of the fourth gear; The fifth gear is meshed with the first gear, the sixth gear is meshed with the fourth gear, the number of teeth of the fifth gear is greater than the number of teeth of the first gear, and the number of teeth of the sixth gear is less than the number of teeth of the fourth gear.

[0008] Preferably, the stepper motor further includes a first bearing, the inner periphery of the first bearing is sleeved on the first transmission shaft, and the outer periphery of the first bearing is embedded in the fourth gear.

[0009] Preferably, the stepper motor further includes a second bearing, and a second bearing is respectively mounted on opposite ends of the first guide column; one of the second bearings is embedded in a side of the first cover plate away from the stator assembly, and an outer periphery of the other second bearing is fixed to the box body.

[0010] Preferably, the stepper motor also includes a third bearing, and a third bearing is respectively mounted on the opposite ends of the second guide column; one of the third bearings is embedded in the side of the first cover plate away from the stator assembly, and the outer periphery of the other third bearing is fixed to the box body. Preferably, the stepper motor further includes a fourth bearing, the inner periphery of the fourth bearing is sleeved on the second transmission shaft, and the outer periphery of the fourth bearing is fixed to the housing.

[0011] Preferably, the stepper motor further includes a fifth bearing, and each of the opposite ends of the rotating shaft is provided with a fifth bearing, wherein one of the fifth bearings is fixed to the first cover plate, and the other fifth bearing is fixed to the second cover plate.

[0012] Preferably, the iron core includes an iron core body and a winding groove formed by an inward depression on the outer peripheral side of the iron core body, and the coil is wound in the winding groove; the two ends of the iron core body on one side close to the rotating shaft are respectively fixed to the first claw pole and the second claw pole.

[0013] Preferably, the stator assembly includes at least two groups, which are stacked and fixed along the axial direction of the rotating shaft.

[0014] Compared with the related art, in the stepping motor of the present invention, the magnetic steel of the rotor assembly is sleeved and fixed on the rotating shaft, and the two ends of the rotating shaft are respectively connected to the first cover plate and the second cover plate to form a rotation connection; the stator assembly includes a first claw pole fixed to the side of the first cover plate close to the second cover plate, a second claw pole fixed to the side of the second cover plate close to the first cover plate, and a solenoid arranged on opposite sides of the rotating shaft, and the first claw pole and the second claw pole are arranged in a relatively matched manner; the first claw pole and the second claw pole are respectively sleeved on the rotor assembly and are both spaced from the magnetic steel; the solenoid includes an iron core and a coil sleeved and fixed on the iron core, and the two opposite ends of the iron core along the axial direction of the rotating shaft are respectively fixed to the first cover plate The iron cores are symmetrically distributed on the opposite sides of the rotor assembly by adjusting the number and arrangement of the coils. The thickness of the device can be only the thickness of the claw pole and the outer diameter of the magnetic steel, thereby realizing the thinnest design of the product. The wall thickness of the coil can be adjusted, that is, the width of the motor can be fully utilized through a flat design to further improve the torque performance of the motor. In addition, the reduction gearbox assembly is fixed to the side of the first cover plate away from the second cover plate, the output end of the rotating shaft is connected to the reduction gearbox assembly, and the positive projection of the reduction gearbox assembly to the first cover plate completely falls within the range of the first cover plate, thereby fully utilizing the width of the motor to realize an ultra-thin motor module. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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 structure of a stepping motor provided in an embodiment of the present invention; Figure 2 A partial structural exploded view of a stepping motor provided in an embodiment of the present invention; Figure 3 For along Figure 1 Schematic diagram of the cross-sectional view along line AA; Figure 4 A schematic structural diagram of a reduction gearbox assembly of a stepping motor provided in an embodiment of the present invention; Figure 5 A schematic structural diagram of a stepping motor provided in another embodiment of the present invention; Figure 6 For along Figure 5 Schematic diagram of the cross-sectional view along line BB. DETAILED DESCRIPTION

[0016] 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.

[0017] See also Figure 1-Figure 4 As shown, an embodiment of the present invention provides a stepper motor 100, which includes a first cover plate 1 and a second cover plate 2 that are arranged opposite to each other, a rotor assembly 3 that is arranged between the first cover plate 1 and the second cover plate 2 and forms a rotational connection with the first cover plate 1 and the second cover plate 2, and a stator assembly 4 that is fixed between the first cover plate 1 and the second cover plate 2, and the stator assembly 4 drives the rotor assembly 3 to rotate. The first cover plate 1 and the second cover plate 2 are used to fix and install the stator assembly 4, and the rotor assembly 3 is arranged between the first cover plate 1 and the second cover plate 2. The first cover plate 1 and the second cover plate 2 can protect the stator assembly 4 and the rotor assembly 3.

[0018] In this embodiment, the first cover plate 1 and the second cover plate 2 are respectively arranged as annular structures, the rotor assembly 3 is arranged in the middle position of the first cover plate 1, and the stator assembly 4 is respectively arranged at both ends of the first cover plate 1, so that the stator assembly 4 is located on opposite sides of the rotor assembly 3.

[0019] The rotor assembly 3 includes a rotating shaft 31 and a magnetic steel 32 sleeved and fixed on the rotating shaft 31. The two ends of the rotating shaft 31 are respectively rotatably connected with the first cover plate 1 and the second cover plate 2. Optionally, the magnetic steel 32 is formed by a plurality of permanent magnets surrounding the rotating shaft 31.

[0020] The stator assembly 4 includes a first claw pole 41 fixed to the side of the first cover plate 1 close to the second cover plate 2, a second claw pole 42 fixed to the side of the second cover plate 2 close to the first cover plate 1, and a solenoid 43 arranged on opposite sides of the rotating shaft 31, wherein the first claw pole 41 and the second claw pole 42 are arranged in a relative matching manner; the first claw pole 41 and the second claw pole 42 are respectively sleeved on the rotor assembly 3 and are both spaced from the magnetic steel 32. The solenoid 43 is arranged on opposite sides of the magnetic steel 32, so that the thickness of the device is only the thickness of the claw pole and the outer diameter of the magnetic steel 32, and the thinnest design of the product is achieved.

[0021] In this embodiment, there may be multiple solenoids 43 , and the desired motor step angle can be obtained by adjusting the relative angles of the coaxial solenoids 43 .

[0022] In this embodiment, the solenoid 43 includes an iron core 431 and a coil 432 sleeved and fixed on the iron core 431. The opposite ends of the iron core 431 along the axial direction of the rotating shaft 31 are respectively fixed to the first cover plate 1 and the second cover plate 2, and the two iron cores 431 are symmetrically distributed on the opposite sides of the rotor assembly 3. By adjusting the number and arrangement position of the coils 432, the device thickness can be only the claw pole thickness and the outer diameter of the magnetic steel 32, so as to achieve the thinnest design of the product; by adjusting the wall thickness of the coil 432, that is, by making full use of the width of the motor through a flat design, the torque performance of the motor can be further improved. The magnetic field generated by the coil 432 and the magnetic steel 32 is driven to realize the rotation of the rotating shaft 31, so that the reduction gearbox assembly 5 moves through the rotation of the rotating shaft 31.

[0023] Specifically, for a single stator assembly 4 structure, when the coil 432 is energized, the two ends of the solenoid 43 are polarized to the N pole and the S pole respectively, and the claw pole on this side is polarized at the same time, so that the first claw pole 41 and the second claw pole 42 are respectively the N pole and the S pole; when the coil 432 is energized with alternating current, the claw poles are alternately the N pole and the S pole, so that rotation is achieved. Of course, the magnetic poles of the first claw pole 41 and the second claw pole 42 can also be interchanged, and the working principle is the same.

[0024] For multiple stator assemblies 4, the current of the coil 432 of the solenoid 43 can be in the same direction or in the opposite direction. In the reverse direction, the polarity generated by the solenoid 43 is opposite, and the electromagnetic field of the upper and lower stator assemblies 4 is not easy to produce a magnetic field short circuit. In this embodiment, the stepper motor 100 also includes a reduction box assembly 5, and the reduction box assembly 5 is fixed to the side of the first cover plate 1 away from the second cover plate 2, and the rotating shaft 31 forms an output end connected with the reduction box assembly 5; the orthographic projection of the reduction box assembly 5 to the first cover plate 1 completely falls within the range of the first cover plate 1. The reduction box assembly 5 is fixed to the side of the first cover plate 1 away from the stator assembly 4, and the output end of the rotating shaft 31 forms a transmission connection with the reduction box assembly 5, and the orthographic projection of the reduction box assembly 5 to the first cover plate 1 completely falls within the range of the first cover plate 1, so that the motor width can be fully utilized, thereby realizing an ultra-thin motor module.

[0025] For this implementation, please refer to Figure 5-6As shown, the reduction box assembly 5 includes a housing 55, a first gear member 51, a second gear member 52 and a third gear member 53 arranged in the housing 55; the first gear member 51 and the third gear member 53 are coaxially arranged and spaced from each other in the axial direction of the rotating shaft 31; the second gear member 52 is located on one side of the first gear member 51. The first gear member 51 includes a first gear 511 and a first transmission shaft 512 extending from one end of the first gear 511 away from the rotating shaft 31 along its axis and arranged parallel to the rotating shaft 31. The second gear component 52 includes a first guide column 523 which is arranged parallel to the rotating shaft 31 and is rotatably connected to the box body 55, a second gear 521 and a third gear 522 which are respectively sleeved and fixed on the first guide column 523, and the second gear 521 and the third gear 522 are fixedly connected; the third gear component 53 includes a fourth gear 531 and a second transmission shaft 532 which protrudes and extends along the axis of the fourth gear 531 at one end away from the first gear 511 and is arranged parallel to the rotating shaft 31, and the first transmission shaft 512 is rotatably arranged with the fourth gear 531.

[0026] The first gear 511 meshes with the second gear 521, and the third gear 522 meshes with the fourth gear 531. The number of teeth of the second gear 521 is greater than that of the first gear 511, and the number of teeth of the third gear 522 is less than that of the fourth gear 531. The first gear 511 is rotated to rotate, thereby driving the second gear 521 and the third gear 522 to rotate, and the third gear 522 is meshed with the fourth gear 531 to drive the fourth gear 531 to rotate.

[0027] For this implementation, please refer to Figure 1-Figure 6 As shown, the reduction gear box assembly 5 further includes a fourth gear member 54 ; the fourth gear member 54 and the second gear member 52 are respectively located on two opposite sides of the first gear member 51 .

[0028] The fourth gear component 54 includes a second guide column 543 which is arranged parallel to the rotating shaft 31 and is rotatably connected to the box body 55, a fifth gear 541 and a sixth gear 542 which are respectively sleeved and fixed on the second guide column 543, and the fifth gear 541 and the sixth gear 542 are fixedly connected; the fifth gear 541 and the second gear 521 are respectively located on the opposite sides of the first gear 511, and the sixth gear 542 and the third gear 522 are respectively located on the opposite sides of the fourth gear 531.

[0029] The fifth gear 541 meshes with the first gear 511 , and the sixth gear 542 meshes with the fourth gear 531 . The number of teeth of the fifth gear 541 is greater than that of the first gear 511 , and the number of teeth of the sixth gear 542 is less than that of the fourth gear 531 .

[0030] Specifically, the housing 55 is used to install the first gear member 51, the second gear member 52, the third gear member 53 and the fourth gear member 54. By fixing the first gear member 51 to the output end of the rotating shaft 31, the first gear member 51 is meshed with the second gear member 52 and the fourth gear member 54 for transmission, the second gear member 52 and the fourth gear member 54 are meshed with the third gear member 53 for transmission, and the end of the fourth gear 531 away from the first gear member 51 is rotatably connected to the housing 55; the first gear member 51 is driven to rotate by the rotation of the rotating shaft 31, thereby driving the second gear member 52 and the fourth gear member to rotate respectively, and the third gear member 53 is driven to rotate by the second gear member 52 and the fourth gear member 54, thereby achieving the driving output effect of the motor.

[0031] The orthographic projection of the box body 55 onto the first cover plate 1 completely falls within the range of the first cover plate 1. The width of the motor can be fully utilized to achieve an ultra-thin motor module.

[0032] Specifically, the first gear 511 is meshed with the second gear 521 and the fifth gear 541 respectively; the fourth gear 531 is meshed with the third gear 522 and the sixth gear 542 respectively. Specifically, the output end of the rotating shaft 31 is connected with the first gear 511, and the rotating shaft 31 drives the first gear 511 to rotate when it rotates. The first gear 511 is meshed with the second gear 521 and the fifth gear 541 respectively, and the first gear 511 drives the second gear 521 and the fifth gear 541 to rotate, thereby realizing a first-stage reduction function. Since the second gear 521 is fixedly connected to the third gear 522, the rotation speed of the third gear 522 is the same as that of the second gear 521; the fifth gear 541 is fixedly connected to the sixth gear 542, and the rotation speed of the sixth gear 542 is the same as that of the fifth gear 541; the third gear 522 and the sixth gear 542 are driven to rotate by the rotation of the second gear 521 and the fifth gear 541 respectively, and the third gear 522 and the sixth gear 542 are respectively engaged with the fourth gear 531, thereby realizing the secondary deceleration function, and the output end of the fifth gear 541 is connected to the external mechanism to realize the motor deceleration output effect. Optionally, the first gear 511, the second gear 521, and the fifth gear 541 are located in the same plane. The third gear 522, the fourth gear 531, and the sixth gear 542 are located in the same plane.

[0033] Optionally, the first gear 511, the second gear 521 and the fifth gear 541 form a first-stage reduction; the third gear 522, the fourth gear 531 and the sixth gear 542 form a second-stage reduction, and the first-stage reduction and the second-stage reduction are driven by the rotation of the shaft 31 to achieve a multi-stage reduction effect. Of course, the reduction box assembly 5 not only includes the above-mentioned second-stage reduction, but also can be a third-stage reduction, a fourth-stage reduction, etc., and its working principle is the same as the above, which will not be described here.

[0034] The number of reduction poles in the reduction box assembly 5 is not limited, and the number of gears can be further increased to increase the reduction ratio of the module, thereby achieving a multi-stage reduction effect.

[0035] In this embodiment, the stepper motor 100 further includes a first bearing 6, the inner periphery of the first bearing 6 is sleeved on the first transmission shaft 512, and the outer periphery of the first bearing 6 is embedded in the fourth gear. The first bearing 6 can reduce the rotational friction between the first transmission shaft 512 and the housing 55, thereby improving the transmission performance of the first gear 511.

[0036] In this embodiment, the stepper motor 100 further includes a second bearing 7, and two opposite ends of the first guide column are sleeved with a second bearing 7; one of the second bearings 7 is embedded in the side of the first cover plate 1 away from the stator assembly 4, and the outer periphery of the other second bearing 7 is fixed to the box body 55. The two second bearings 7 reduce the friction between the first guide column and the box body 55, thereby improving the transmission efficiency of the second gear member 52.

[0037] In this embodiment, the stepper motor 100 further includes a third bearing 8, and each of the opposite ends of the second guide column is provided with a third bearing 8; one of the third bearings 8 is embedded in the side of the first cover plate 1 away from the stator assembly 4, and the outer periphery of the other third bearing 8 is fixed to the box body 55. The friction between the second guide column and the box body 55 is reduced by the two third bearings 8, thereby improving the transmission efficiency of the fourth gear member 54.

[0038] In this embodiment, the stepper motor 100 further includes a fourth bearing 9, the inner circumference of the fourth bearing 9 is sleeved on the second transmission shaft 532, and the outer circumference of the fourth bearing 9 is fixed to the box body 55. The fourth bearing 9 reduces the friction between the second transmission shaft 532 and the box body 55, thereby improving the transmission efficiency of the fourth gear 531.

[0039] In this embodiment, the stepper motor 100 further includes a fifth bearing 10, and each of the opposite ends of the rotating shaft 31 is provided with a fifth bearing 10, wherein one of the fifth bearings 10 is fixed to the first cover plate 1, and the other fifth bearing 10 is fixed to the second cover plate 2. The two fifth bearings 10 are used to improve the rotation effect of the rotating shaft 31, and further improve the transmission efficiency of the rotating shaft 31.

[0040] In this embodiment, the iron core 431 includes an iron core body 4311 and a winding groove 4312 formed by the outer peripheral side of the iron core body 4311 being recessed inward; the coil 432 is wound in the winding groove 4312, and the two ends of the iron core body 4311 on the side close to the rotating shaft 31 are respectively fixed to the first claw pole 41 and the second claw pole 42. The iron core body 4311 facilitates the installation of the coil 432. Optionally, the end of the iron core body 4311 is a semicircular structure, and the planar structure of the iron core body 4311 on the side close to the rotating shaft 31 is fixed to the first claw pole 41 and the second claw pole 42, saving installation space.

[0041] In this embodiment, the stator assembly 4 includes at least two groups, which are stacked and fixed along the axial direction of the rotating shaft 31. By providing multiple groups, the driving performance of the stator assembly 4 is improved.

[0042] Compared with the related art, in the stepping motor of the present invention, the magnetic steel of the rotor assembly is sleeved and fixed on the rotating shaft, and the two ends of the rotating shaft are respectively connected to the first cover plate and the second cover plate to form a rotation connection; the stator assembly includes a first claw pole fixed to the side of the first cover plate close to the second cover plate, a second claw pole fixed to the side of the second cover plate close to the first cover plate, and a solenoid arranged on opposite sides of the rotating shaft, and the first claw pole and the second claw pole are arranged in a relatively matched manner; the first claw pole and the second claw pole are respectively sleeved on the rotor assembly and are both spaced from the magnetic steel; the solenoid includes an iron core and a coil sleeved and fixed on the iron core, and the two opposite ends of the iron core along the axial direction of the rotating shaft are respectively fixed to the first cover plate The iron cores are symmetrically distributed on the opposite sides of the rotor assembly by adjusting the number and arrangement of the coils. The thickness of the device can be only the thickness of the claw pole and the outer diameter of the magnetic steel, thereby realizing the thinnest design of the product. The wall thickness of the coil can be adjusted, that is, the width of the motor can be fully utilized through a flat design to further improve the torque performance of the motor. In addition, the reduction gearbox assembly is fixed to the side of the first cover plate away from the second cover plate, the output end of the rotating shaft is connected to the reduction gearbox assembly, and the positive projection of the reduction gearbox assembly to the first cover plate completely falls within the range of the first cover plate, thereby fully utilizing the width of the motor to realize an ultra-thin motor module.

[0043] 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 a first cover plate and a second cover plate arranged opposite to each other, a rotor assembly arranged between the first cover plate and the second cover plate and rotatably connected with the first cover plate and the second cover plate, and a stator assembly fixed between the first cover plate and the second cover plate, wherein the stator assembly drives the rotor assembly to rotate; characterized in that: The rotor assembly includes a rotating shaft and a magnetic steel sleeved and fixed on the rotating shaft, and two ends of the rotating shaft are respectively rotatably connected with the first cover plate and the second cover plate; The stator assembly includes a first claw pole fixed to a side of the first cover plate close to the second cover plate, a second claw pole fixed to a side of the second cover plate close to the first cover plate, and a solenoid arranged on opposite sides of the rotating shaft, wherein the first claw pole and the second claw pole are arranged in a corresponding manner; the first claw pole and the second claw pole are respectively sleeved on the rotor assembly and are spaced apart from the magnetic steel; The solenoid comprises an iron core and a coil sleeved and fixed on the iron core, the opposite ends of the iron core along the axial direction of the rotating shaft are respectively fixed to the first cover plate and the second cover plate, and the iron cores are symmetrically distributed on opposite sides of the rotor assembly; The stepper motor also includes a reduction box assembly, which is fixed to a side of the first cover plate away from the second cover plate, and the rotating shaft includes an output end connected to the reduction box assembly; the orthographic projection of the reduction box assembly onto the first cover plate completely falls within the range of the first cover plate.

2. The stepper motor according to claim 1, characterized in that: The reduction gearbox assembly comprises a housing, a first gear member, a second gear member and a third gear member disposed in the housing; the first gear member and the third gear member are coaxially disposed and spaced apart from each other in the axial direction of the rotating shaft; the second gear member is located on one side of the first gear member; The first gear member comprises a first gear and a first transmission shaft extending protrudingly from one end of the first gear away from the rotating shaft along the axis thereof and arranged parallel to the rotating shaft; The second gear member includes a first guide post arranged parallel to the rotating shaft and rotatably connected to the box body, a second gear and a third gear respectively sleeved and fixed on the first guide post, and the second gear is fixedly connected to the third gear; The third gear member includes a fourth gear and a second transmission shaft extending from one end of the fourth gear away from the first gear along its axis and arranged parallel to the rotating shaft, and the first transmission shaft is rotatably arranged with the fourth gear; The first gear is meshed with the second gear, the third gear is meshed with the fourth gear, the number of teeth of the second gear is greater than the number of teeth of the first gear, and the number of teeth of the third gear is less than the number of teeth of the fourth gear.

3. The stepper motor according to claim 2, characterized in that: The reduction gearbox assembly further includes a fourth gear member; the fourth gear member and the second gear member are respectively located on opposite sides of the first gear member; The fourth gear member includes a second guide column arranged parallel to the rotating shaft and rotatably connected to the box body, a fifth gear and a sixth gear respectively sleeved and fixed on the second guide column, and the fifth gear is fixedly connected to the sixth gear; the fifth gear and the second gear are respectively located on opposite sides of the first gear, and the sixth gear and the third gear are respectively located on opposite sides of the fourth gear; The fifth gear is meshed with the first gear, the sixth gear is meshed with the fourth gear, the number of teeth of the fifth gear is greater than the number of teeth of the first gear, and the number of teeth of the sixth gear is less than the number of teeth of the fourth gear.

4. The stepper motor according to claim 2, characterized in that: The stepper motor further includes a first bearing, the inner periphery of the first bearing is sleeved on the first transmission shaft, and the outer periphery of the first bearing is embedded in the fourth gear.

5. The stepper motor according to claim 2, characterized in that: The stepper motor also includes a second bearing, and each of the opposite ends of the first guide column is provided with a second bearing; one of the second bearings is embedded in a side of the first cover plate away from the stator assembly, and the outer periphery of the other second bearing is fixed to the box body.

6. The stepper motor according to claim 3, characterized in that: The stepper motor also includes a third bearing, and each of the opposite ends of the second guide column is provided with a third bearing; one of the third bearings is embedded in a side of the first cover plate away from the stator assembly, and the outer periphery of the other third bearing is fixed to the box body.

7. The stepper motor according to claim 2, characterized in that: The stepper motor further comprises a fourth bearing, the inner periphery of the fourth bearing is sleeved on the second transmission shaft, and the outer periphery of the fourth bearing is fixed to the box body.

8. The stepper motor according to claim 1, characterized in that: The stepper motor further includes a fifth bearing. The opposite ends of the rotating shaft are each sleeved with a fifth bearing, wherein one of the fifth bearings is fixed to the first cover plate, and the other fifth bearing is fixed to the second cover plate.

9. The stepper motor according to claim 1, characterized in that: The iron core includes an iron core body and a winding groove formed by an inward depression of the outer circumference of the iron core body, and the coil is wound in the winding groove; the two ends of the iron core body on a side close to the rotating shaft are respectively fixed to the first claw pole and the second claw pole.

10. The stepper motor according to claim 1, characterized in that: The stator assembly includes at least two groups, which are stacked and fixed along the axial direction of the rotating shaft.

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