Stepper electric motor

Abstract

The present invention relates to the technical field of electric motors, and in particular to a stepper electric motor. Compared with the prior art, the stepper electric motor of the present invention features that stator assemblies are arranged around a rotor assembly and are spaced apart from the rotor assembly; the rotor assembly comprises a rotating shaft and magnetic steel sleeved and fixed on the rotating shaft; each stator assembly comprises a housing arranged coaxially with a shell and fixed to the shell, a claw pole assembly arranged around the periphery of the rotor assembly, and a coil sleeved on the claw pole assembly, the claw pole assembly being accommodated and fixed inside the housing; and the stepper electric motor further comprises a fixing bracket, and the fixing bracket extends in the axial direction of the rotating shaft and is fixed to the shell. The space outside the stepper electric motor body is fully utilized, such that the structural strength can be improved without increasing the placement position of devices, and the bending strength of the stepper electric motor body is enhanced by means of the fixing bracket, thereby ensuring that the stepper electric motor has a sufficient height to improve the torque performance.

Description

A stepping motor TECHNICAL FIELD

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

[0002] The stepping motor has been widely applied in the fields of electric motor and generator due to its compact structure, high power density, high working efficiency and remarkable energy saving and consumption reducing benefits. In recent years, the demand for the devices directly driven by the stepping motor in industrial field is increasingly urgent. The wide application of the stepping motor directly driven devices will bring inestimable energy saving benefits. TECHNICAL PROBLEM

[0003] The existing stepping motor is increasingly required to minimize the diameter in the application of electronic devices. In order to ensure sufficient output torque, the height of the motor needs to be further increased while the diameter is reduced, thereby resulting in the elongated structure of the motor. Such design inevitably leads to the serious reduction of the structural strength of the motor and the insufficient bending strength.

[0004] Therefore, it is necessary to provide a new stepping motor to solve the above technical problems. TECHNICAL SOLUTION

[0005] The present application aims to enhance the bending strength of the stepping motor body without additional increase of the motor placement space, so as to ensure the sufficient height of the stepping motor to improve the torque performance.

[0006] In order to achieve the above purpose, the present application provides a stepping motor, which comprises a shell, a stator assembly fixed to the shell and a rotor assembly supported on the shell and rotationally connected with the shell, the stator assembly is arranged around the rotor assembly and spaced from the rotor assembly;

[0007] The rotor assembly comprises a rotating shaft and a magnetic steel sleeved and fixed to the rotating shaft, both ends of the rotating shaft are rotationally connected with the shell;

[0008] The stator assembly comprises a plurality of stator assemblies fixed to the shell, the plurality of stator assemblies are sleeved on the rotor assembly and arranged along the axial direction of the rotating shaft; each stator assembly comprises an outer shell coaxially arranged with the shell and fixed to the shell, a claw pole assembly arranged around the outer periphery of the rotor assembly and a coil sleeved on the claw pole assembly, the claw pole assembly is accommodated and fixed in the outer shell;

[0009] The shell comprises a surrounding wall formed by abutting of all the shells, and a first cover plate and a second cover plate arranged opposite along the axial direction of the rotating shaft, the surrounding wall is clamped between the first cover plate and the second cover plate, and the two ends of the rotating shaft are rotationally connected with the first cover plate and the second cover plate respectively.

[0010] The stepping motor further comprises a fixed support extending along the axial direction of the rotating shaft and fixed to the shell.

[0011] Preferably, the fixed support comprises two side walls arranged opposite and extending along the axial direction of the rotating shaft, a connecting wall connecting the same side of the two side walls, and a through hole penetrating the connecting wall; the two ends of the side wall are fixed to the first cover plate and the second cover plate respectively, the connecting wall extends along the axial direction of the rotating shaft and abuts against the surrounding wall, and the through hole is arranged at the position where the connecting wall abuts against the surrounding wall and extends along the axial direction of the rotating shaft.

[0012] Preferably, the first cover plate, the second cover plate and the surrounding wall are all circular in shape, the side walls are tangentially arranged with the first cover plate and the second cover plate respectively, and the two side walls are located at opposite sides of the shell respectively; the connecting wall is tangential to the shell and makes the through hole opposite to the position where the connecting wall is tangential to the surrounding wall.

[0013] Preferably, the distance from the connecting wall to the center of the rotating shaft is equal to the radius of the first cover plate.

[0014] Preferably, the stepping motor further comprises a first bearing and a second bearing, the first bearing is sleeved on one end of the rotating shaft close to the first cover plate and embeddedly fixed to the first cover plate, and the second bearing is sleeved on one end of the rotating shaft close to the second cover plate and embeddedly fixed to the second cover plate.

[0015] Preferably, the stepping motor further comprises two spacers arranged opposite, the two spacers are sleeved on the rotating shaft, and the two spacers are fixed to the two ends of the magnetic steel respectively.

[0016] Preferably, the claw pole assembly comprises a claw pole framework fixed to the shell, a first claw pole and a second claw pole received and fixed in the claw pole framework and cooperating with each other, the claw pole framework at least partially penetrates one side of the shell along the radial direction of the rotating shaft, and the coil is sleeved and fixed to the claw pole framework.

[0017] Preferably, the claw pole framework comprises a framework body received and fixed to the shell and an extension arm extending and penetrating the shell along the radial direction of the rotating shaft from the framework body, the first claw pole and the second claw pole are received and fixed in the framework body, and the coil is sleeved in the framework body.

[0018] Preferably, the magnetic steel comprises a plurality of magnetic steels, and the plurality of magnetic steels are fixedly arranged at the outer circumferential side of the rotating shaft. Advantages

[0019] Compared with the prior art, the step motor comprises a rotating shaft, a magnetic steel fixedly sleeved on the rotating shaft, a stator assembly, and a fixed support. The rotating shaft is rotatably connected to a housing. The stator assembly comprises a plurality of stator assemblies fixed to the housing. Each stator assembly comprises an outer shell coaxially arranged on the housing, a claw pole assembly arranged around the outer circumferential side of the rotating shaft, and a coil sleeved on the claw pole assembly. The claw pole assembly is accommodated in the outer shell. The fixed support extends along the axial direction of the rotating shaft and is fixed to the housing. The space outside the step motor body is fully utilized, so that the structural strength is improved without increasing the device placement position. The bending strength of the step motor body is enhanced by the fixed support, so that the step motor has sufficient height to improve the torque performance. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0021] Fig. 1 is a perspective structural schematic view of the step motor provided by the embodiment of the present application;

[0022] Fig. 2 is a perspective structural exploded schematic view of the step motor provided by the embodiment of the present application;

[0023] Fig. 3 is a top view of the step motor provided by the embodiment of the present application;

[0024] Fig. 4 is a sectional view along the line A-A in Fig. 3;

[0025] Fig. 5 is a structural schematic view of the fixed support of the step motor provided by the embodiment of the present application.

[0026] In the figure, 100, stepper motor, 1, shell, 11, first cover plate, 12, second cover plate, 13, enclosing wall, 2, rotor assembly, 21, rotating shaft, 22, magnetic steel, 3, stator assembly, 31, shell, 32, claw pole assembly, 321, claw pole framework, 3211, framework body, 3212, extension arm, 322, first claw pole, 323, second claw pole, 33, coil, 4, fixed support, 41, side wall, 42, connecting wall, 43, through hole, 51, first bearing, 52, second bearing, 6, gasket. Embodiments of the present application

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0028] In combination with FIGS. 1-5, the embodiments of the present application provide a stepper motor 100, which comprises a shell 1, a stator assembly 3 fixed to the shell 1, and a rotor assembly 2 supported on the shell 1 and rotationally connected with the shell 1, the stator assembly 3 is arranged around the rotor assembly 2 and spaced from the rotor assembly 2.

[0029] The rotor assembly 2 comprises a rotating shaft 21 and a magnetic steel 22 sleeved and fixed to the rotating shaft 21, both ends of the rotating shaft 21 are rotationally connected with the shell 1.

[0030] The stator assembly 3 comprises a plurality of and is fixed to the shell 1, a plurality of the stator assembly 3 is sleeved on the rotor assembly 2 and arranged along the axial direction of the rotating shaft 21; each stator assembly 3 comprises a shell 31 coaxially arranged with the shell 1 and fixed to the shell 1, a claw pole assembly 32 arranged around the outer periphery of the rotor assembly 2, and a coil 33 sleeved on the claw pole assembly, the claw pole assembly 32 is accommodated and fixed in the shell 31.

[0031] The shell 1 comprises an enclosing wall 13 formed by abutting all the shells 31, and a first cover plate 11 and a second cover plate 12 oppositely arranged along the axial direction of the rotating shaft 21, the enclosing wall 13 is clamped between the first cover plate 11 and the second cover plate 12, both ends of the rotating shaft 21 are rotationally connected with the first cover plate 11 and the second cover plate 12.

[0032] The stepper motor further comprises a fixed support 4, which extends along the axial direction of the rotating shaft 21 and is fixed to the shell 1.

[0033] In the embodiment, the fixing support 4 comprises two side walls 41 oppositely arranged and extending along the axial direction of the rotating shaft 21, a connecting wall 42 connecting the same side of the two side walls 41, and a through hole 43 penetrating the connecting wall 42; the two ends of the side wall 41 are fixed to the first cover plate 11 and the second cover plate 12 respectively, the connecting wall 42 extends along the axial direction of the rotating shaft 21 and abuts against the surrounding wall 13, and the through hole 43 is arranged at the position of the connecting wall 42 abutting against the surrounding wall 13 and extends along the axial direction of the rotating shaft 21.

[0034] In the embodiment, the periphery of the first cover plate 11, the second cover plate 12 and the surrounding wall 13 is circular, the side wall 41 is tangentially arranged with the first cover plate 11 and the second cover plate 12 respectively, and the two side walls 41 are located at opposite sides of the shell 1 respectively; the connecting wall 42 is tangential to the surrounding wall 13, and the through hole 43 is directly opposite the position where the connecting wall 42 is tangential to the surrounding wall 13.

[0035] In the embodiment, the distance from the connecting wall 42 to the center of the rotating shaft 21 is equal to the radius of the first cover plate 11. As shown in FIG. 3, which is a top view of the stepping motor 100 provided by the embodiment of the application, the stepping motor 100 is cylindrical, the first cover plate 11 and the second cover plate 12 have the same structure, and R in the figure is the radius of the first cover plate 11 (the radius of the stepping motor 100 is the same as the radius of the first cover plate 11). When the stepping motor 100 is installed in other devices such as mobile phones, the space occupied is a rectangle with a side length of 2R, and since the fixing support 4 is still arranged within the range of the rectangle, no additional space is occupied, the space outside the stepping motor 100 is fully utilized, and thus the structural strength of the stepping motor 100 is enhanced without increasing the placement space.

[0036] In the embodiment, the stepping motor 100 further comprises a first bearing 51 and a second bearing 52, the first bearing 51 is sleeved on one end of the rotating shaft 21 close to the first cover plate 11 and is embedded and fixed to the first cover plate 11, and the second bearing 52 is sleeved on one end of the rotating shaft 21 close to the second cover plate 12 and is embedded and fixed to the second cover plate 12.

[0037] In the embodiment, the stepping motor 100 further comprises two spacers 6 oppositely arranged, the two spacers 6 are sleeved on the rotating shaft 21, and the two spacers 6 are fixed to the two ends of the magnet 22 respectively.

[0038] In the embodiment, the claw pole assembly 32 comprises a claw pole frame 321 fixed to the shell 31, a first claw pole 322 and a second claw pole 323 oppositely accommodated and fixed in the claw pole frame 321, the claw pole frame 321 at least partially penetrates one side of the shell 31 along the radial direction of the rotating shaft 21, and the coil 33 is sleeved and fixed to the claw pole frame 321.

[0039] In the embodiment, the claw pole frame 321 comprises a frame body 3211 accommodated and fixed to the shell 31 and an extension arm 3212 extending and penetrating the shell 31 along the radial direction of the rotating shaft 21, the first claw pole 322 and the second claw pole 323 are accommodated and fixed in the frame body 3211, and the coil 33 is sleeved on the frame body 3211.

[0040] In the embodiment, the magnetic steel 22 comprises a plurality of magnetic steels 22 fixed to the outer circumferential side of the rotating shaft 21.

[0041] Compared with the prior art, the step motor of the application. The stator assembly is arranged around and spaced from the rotor assembly; the rotor assembly comprises a rotating shaft and a magnetic steel sleeved and fixed to the rotating shaft, the end of the rotating shaft is rotationally connected with the housing; the stator assembly comprises a plurality of stator assemblies fixed to the housing, the plurality of stator assemblies are respectively sleeved on the rotor assembly and arranged along the axial direction of the rotating shaft; each stator assembly comprises a shell coaxially arranged with the housing and fixed to the housing, a claw pole assembly arranged around the outer periphery of the rotor assembly, and a coil sleeved on the claw pole assembly, the claw pole assembly is accommodated and fixed in the shell, and the step motor further comprises a fixed support extending along the axial direction of the rotating shaft and fixed to the housing. The space outside the step motor body is fully utilized, so that the structural strength can be improved without increasing the device placement position, the bending strength of the step motor body is enhanced by the fixed support, so that the step motor has sufficient height to improve the torque performance.

[0042] The above only describes the embodiments of the application, and it should be pointed out that those skilled in the art can make improvements without departing from the inventive concept, and these improvements are within the protection scope of the application.

Claims

1. A stepper motor comprising a housing, a stator assembly fixed to the housing, and a rotor assembly supported by the housing and rotatably connected to the housing, the stator assembly being arranged around and spaced apart from the rotor assembly, characterized in that: the rotor assembly comprises a rotor shaft and a magnetic steel fixed to the rotor shaft, both ends of the rotor shaft being rotatably connected to the housing; the stator assembly comprises a plurality of stator assemblies fixed to the housing, the plurality of stator assemblies being arranged along the axial direction of the rotor shaft and sleeved on the rotor assembly, each of the stator assemblies comprising an outer shell coaxially arranged with the housing and fixed to the housing, a claw pole assembly arranged around the outer periphery of the rotor assembly, and a coil sleeved on the claw pole assembly, the claw pole assembly being accommodated in the outer shell; the housing comprises a surrounding wall formed by abutting all the outer shells, and a first cover plate and a second cover plate oppositely arranged along the axial direction of the rotor shaft, the surrounding wall being clamped between the first cover plate and the second cover plate, both ends of the rotor shaft being rotatably connected to the first cover plate and the second cover plate, respectively; the stepper motor further comprises a fixed support extending along the axial direction of the rotor shaft and fixed to the housing.

2. The stepper motor of claim 1, wherein, the fixed support comprises two side walls oppositely arranged and extending along the axial direction of the rotor shaft, a connecting wall connecting the same side of the two side walls, and a through hole penetrating the connecting wall, both ends of the side wall being fixed to the first cover plate and the second cover plate, respectively, the connecting wall extending along the axial direction of the rotor shaft and abutting the surrounding wall, the through hole being arranged at the position where the connecting wall abuts the surrounding wall and extending along the axial direction of the rotor shaft.

3. The stepper motor of claim 2, wherein, the first cover plate, the second cover plate, and the surrounding wall all have a circular outer periphery, the side walls are tangentially arranged with the first cover plate and the second cover plate, respectively, and the two side walls are located on opposite sides of the housing, respectively, the connecting wall is tangential to the surrounding wall and makes the through hole directly opposite the position where the connecting wall is tangential to the surrounding wall.

4. The stepper motor of claim 3, wherein, the distance from the connecting wall to the center of the rotor shaft is equal to the radius of the first cover plate.

5. The stepper motor of claim 1, wherein, the stepper motor further comprises a first bearing and a second bearing, the first bearing being sleeved on one end of the rotor shaft close to the first cover plate and embeddedly fixed to the first cover plate, the second bearing being sleeved on one end of the rotor shaft close to the second cover plate and embeddedly fixed to the second cover plate.

6. The stepper motor of claim 1, wherein, the stepper motor further comprises two spacers oppositely arranged, the two spacers being sleeved on the rotor shaft, and the two spacers being fixed to both ends of the magnetic steel, respectively.

7. The stepper motor of claim 1, wherein, the claw pole assembly comprises a claw pole framework fixed to the outer shell, a first claw pole and a second claw pole oppositely accommodated in the claw pole framework and cooperated with each other, the claw pole framework penetrating at least partially through one side of the outer shell along the radial direction of the rotor shaft, and the coil being sleeved and fixed to the claw pole framework.

8. The stepper motor of claim 7, wherein, The claw pole skeleton comprises a skeleton body received and fixed to the shell and an extension arm extended through the shell along the radial direction of the rotating shaft by the skeleton body, the first claw pole and the second claw pole are received and fixed in the skeleton body, and the coil is sleeved on the skeleton body.

9. The stepper motor of claim 1 wherein, The magnetic steel comprises a plurality of magnetic steels, and the plurality of magnetic steels are fixed at the outer circumferential side of the rotating shaft.

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