Stepping motor

Abstract

The present invention relates to the technical field of electric motors, and specifically relates to a stepping motor. The stepping motor comprises a first cover plate, a second cover plate, and a stator assembly and a rotor assembly sandwiched between the first cover plate and the second cover plate; and a first magnetic spring sleeved on a rotating shaft of the rotor assembly, wherein the first magnetic spring comprises an annular first magnetic ring and second magnetic ring, the inner diameters of the first magnetic ring and the second magnetic ring being greater than the diameter of the rotating shaft, and the first magnetic ring and the second magnetic ring being magnetized in the direction of thickness and the magnetization directions being opposite. Compared with the prior art, the present invention effectively enhances the axial constraint of an electric motor rotor by adding a non-contact magnetic spring to the rotating shaft of the rotor, thereby eliminating axial end play; moreover, there is no physical contact between the non-contact magnetic spring and the rotating shaft, and thus no additional friction force is introduced; the output torque outperforms that of existing contact-type coil springs or elastic washers, and the operational noise of the electric motor is greatly reduced.

Description

Stepping motor TECHNICAL FIELD

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

[0002] Stepping motor has been widely used in the field of electric motor and generator due to its compact structure, high power density, high work efficiency and significant energy saving and consumption reduction benefits. In recent years, the demand for devices directly driven by stepping motor in industrial field is increasingly urgent. The wide application of these stepping motor direct drive devices will bring immeasurable energy saving benefits. TECHNICAL PROBLEM

[0003] In the process of running, the stepping motor will occur to runout, which makes the motor unstable. The existing method usually uses coil spring or elastic washer to reduce the runout of the motor, but the additional friction introduced by such contact type coil spring or elastic washer will cause the motor to generate a lot of noise in the process of running, and the effect of preventing runout is not good.

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

[0005] The present application provides a stepping motor, which aims to eliminate the runout of the stepping motor in the process of running and reduce the additional friction introduced by using traditional contact type coil spring or elastic washer and the running noise of the motor.

[0006] In order to achieve the above purpose, the present application provides a stepping motor, which comprises a first cover plate, a second cover plate and a stator assembly and a rotor assembly clamped between the first cover plate and the second cover plate, the rotor assembly is arranged between the first cover plate and the second cover plate and is rotatably connected with the first cover plate and the second cover plate, and the stator assembly is arranged around the rotor assembly in a spaced manner;

[0007] The rotor assembly comprises a rotating shaft, a magnetic conducting ring sleeved and fixed on the rotating shaft, and a magnetic steel sleeved and fixed on the magnetic conducting ring;

[0008] The stator assembly comprises a first driving unit and a second driving unit distributed in abutment along the axial direction of the rotating shaft, the first driving unit is fixed in abutment on the side of the first cover plate facing the second cover plate, the second driving unit is fixed in abutment on the side of the second cover plate facing the first cover plate, and the first driving unit and the second driving unit are arranged around the magnetic steel in a spaced manner along the radial direction of the rotating shaft; characterized in that,

[0009] The step motor further comprises a first magnetic spring sleeved on the rotating shaft, the first magnetic spring comprises a first magnetic ring in a ring shape and a second magnetic ring oppositely and spaced apart from the first magnetic ring, and the inner diameters of the first magnetic ring and the second magnetic ring are greater than the diameter of the rotating shaft.

[0010] The first magnetic ring is fixed to the first cover plate and rotationally connected with the rotating shaft, the second magnetic ring is fixed to the magnetic conducting ring and rotationally connected with the rotating shaft, and the first magnetic ring and the second magnetic ring are magnetized in the thickness direction and the magnetization directions are opposite.

[0011] Preferably, the step motor further comprises a second magnetic spring sleeved on the rotating shaft, the second magnetic spring comprises a third magnetic ring in a ring shape and a fourth magnetic ring oppositely and spaced apart from the third magnetic ring, and the inner diameters of the third magnetic ring and the fourth magnetic ring are greater than the diameter of the rotating shaft, the third magnetic ring is fixed to the second cover plate and rotationally connected with the rotating shaft, the fourth magnetic ring is fixed to the magnetic conducting ring and rotationally connected with the rotating shaft, and the third magnetic ring and the fourth magnetic ring are magnetized in the thickness direction and the magnetization directions are opposite.

[0012] Preferably, the magnetic steel comprises a first magnetic steel and a second magnetic steel, the first magnetic steel and the second magnetic steel are spaced apart along the axial direction of the rotating shaft, the first driving unit is spaced apart and surrounds the first magnetic steel along the radial direction of the rotating shaft, and the second driving unit is spaced apart and surrounds the second magnetic steel along the radial direction of the rotating shaft.

[0013] Preferably, the first cover plate and the second cover plate are respectively provided with a first through hole and a second through hole penetrating along the axial direction of the rotating shaft, and the first magnetic ring and the third magnetic ring are respectively embedded and fixed in the first through hole and the second through hole.

[0014] Preferably, the magnetic conducting ring comprises a first magnetic conducting ring and a second magnetic conducting ring, the first magnetic conducting ring and the second magnetic conducting ring are spaced apart along the axial direction of the rotating shaft, the first magnetic steel is sleeved and fixed on the first magnetic conducting ring, the second magnetic steel is sleeved and fixed on the second magnetic conducting ring, the second magnetic ring is fixedly embedded on one side of the first magnetic conducting ring close to the first cover plate, and the fourth magnetic ring is fixedly embedded on one side of the second magnetic conducting ring close to the second cover plate.

[0015] Preferably, the stepping motor further comprises a first bearing and a second bearing sleeved on the rotating shaft and rotatably connected with the rotating shaft, the first bearing comprises a first bearing body fixed in the first through hole, a second bearing body extending in the axial direction of the rotating shaft away from the first cover plate, and a first limiting ring extending in the radial direction of the rotating shaft away from the rotating shaft from the outer periphery of the second bearing body, the first bearing body is abutted and fixed to one side of the first magnetic ring away from the first magnetic steel, and the first limiting ring is abutted and fixed to one side of the first cover plate away from the first magnetic steel.

[0016] The second bearing comprises a third bearing body fixed in the second through hole, a fourth bearing body extending in the axial direction of the rotating shaft away from the second cover plate, and a second limiting ring extending in the radial direction of the rotating shaft away from the rotating shaft from the outer periphery of the fourth bearing body, the third bearing body is abutted and fixed to one side of the third magnetic ring away from the second magnetic steel, and the second limiting ring is abutted and fixed to one side of the second cover plate away from the second magnetic steel.

[0017] Preferably, the first cover plate is rotatably connected with the rotating shaft through the first bearing body, the second bearing body, and the first magnetic ring, and the second cover plate is rotatably connected with the rotating shaft through the third bearing body, the fourth bearing body, and the third magnetic ring.

[0018] Preferably, the first driving unit comprises a first cylindrical framework, a first coil, and a first stator magnetic ring, the first stator magnetic ring is arranged around the first magnetic steel in the radial direction of the rotating shaft and is abutted and fixed to one side of the first cover plate facing the second cover plate, the first stator magnetic ring comprises a first claw-shaped half body and a second claw-shaped half body, the first claw-shaped half body and the second claw-shaped half body are opposite and clamped to form a cylindrical first receiving space, the first cylindrical framework is fixed in the first receiving space, and the first coil is arranged on the outer periphery of the first cylindrical framework.

[0019] The second driving unit comprises a second cylindrical framework, a second coil, and a second stator magnetic ring, the second stator magnetic ring is arranged around the second magnetic steel in the radial direction of the rotating shaft and is abutted and fixed to one side of the second cover plate facing the first cover plate, the second stator magnetic ring comprises a third claw-shaped half body and a fourth claw-shaped half body, the third claw-shaped half body and the fourth claw-shaped half body are opposite and clamped to form a cylindrical second receiving space, the second cylindrical framework is fixed in the second receiving space, and the second coil is arranged on the outer periphery of the second cylindrical framework.

[0020] Preferably, the first claw-shaped half body comprises a side wall, a top wall extending from the side wall towards the rotation axis in a radial direction of the rotation axis, and a plurality of first claw poles extending from the top wall towards a direction away from the top wall in an axial direction of the rotation axis, and the second claw-shaped half body comprises a base and a plurality of second claw poles extending from the base towards a direction away from the base in the axial direction of the rotation axis.

[0021] Preferably, the plurality of first claw poles and the plurality of second claw poles are arranged in an interlocking manner. Advantages

[0022] Compared with the prior art, the application effectively strengthens the axial constraint of the motor rotor by adding the non-contact magnetic spring on the rotation axis of the rotor, and can eliminate the movement, and the non-contact magnetic spring does not have physical contact with the rotation axis and does not introduce additional friction, and the output torque is superior to the existing contact type coil spring or elastic washer, and the motor operation noise is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0024] Fig. 1 is a perspective structural schematic view of a stepping motor provided by an embodiment of the present application;

[0025] Fig. 2 is a sectional view along line A-A in Fig. 1;

[0026] Fig. 3 is a perspective structural exploded schematic view of a stepping motor provided by an embodiment of the present application;

[0027] Fig. 4 is a perspective structural exploded schematic view of a second stator magnetic ring of a stepping motor provided by an embodiment of the present application. Embodiments of the present application

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0029] With reference to FIGS. 1-4, the embodiment of the present application provides a stepper motor 100, which comprises a first cover plate 11, a second cover plate 12, a stator assembly 3 and a rotor assembly 2 clamped between the first cover plate 11 and the second cover plate 12, the rotor assembly 2 is arranged between the first cover plate 11 and the second cover plate 12 and rotationally connected with the first cover plate 11 and the second cover plate 12, and the stator assembly 3 is arranged around the rotor assembly 2 at intervals.

[0030] The rotor assembly 2 comprises a rotating shaft 21, a magnetic conducting ring 22 fixedly sleeved on the rotating shaft 21, and a magnetic steel 23 fixedly sleeved on the magnetic conducting ring 22, the magnetic steel 23 comprises a first magnetic steel 231 and a second magnetic steel 232, and the first magnetic steel 231 and the second magnetic steel 232 are arranged at intervals along the axial direction of the rotating shaft 21.

[0031] The stator assembly 3 comprises a first driving unit 31 and a second driving unit 32 abuttingly arranged along the axial direction of the rotating shaft 21, the first driving unit 31 and the second driving unit 32 are arranged at intervals along the radial direction of the rotating shaft 21, the first driving unit 31 is fixedly abutted on one side of the first cover plate 11 facing the second cover plate 12, and the second driving unit 32 is fixedly abutted on one side of the second cover plate 12 facing the first cover plate 11. The first driving unit 31 and the second driving unit 32 are arranged around the magnetic steel 23 at intervals along the radial direction of the rotating shaft 21, the first driving unit 31 is arranged around the first magnetic steel 231 at intervals along the radial direction of the rotating shaft 21, and the second driving unit 32 is arranged around the second magnetic steel 232 at intervals along the radial direction of the rotating shaft 21.

[0032] The stepper motor 100 further comprises a first magnetic spring 41 sleeved on the rotating shaft 21, the first magnetic spring 41 comprises a first magnetic ring 411 in the shape of a ring and a second magnetic ring 412 arranged at intervals opposite to the first magnetic ring 411, and the inner diameters of the first magnetic ring 411 and the second magnetic ring 412 are greater than the diameter of the rotating shaft 21.

[0033] The first magnetic ring 411 is fixed to the first cover plate 11 and rotationally connected with the rotating shaft 21, the second magnetic ring 412 is fixed to the magnetic conducting ring 22 and rotates together with the rotating shaft 21, and the first magnetic ring 411 and the second magnetic ring 412 are magnetized along the thickness direction and the magnetization directions are opposite.

[0034] In the embodiment, the step motor 100 further comprises a second magnetic force spring 42 sleeved on the rotating shaft 21, the second magnetic force spring 42 comprises a third magnetic ring 421 in a ring shape and a fourth magnetic ring 422 oppositely arranged with the third magnetic ring 421, the inner diameter of the third magnetic ring 421 and the fourth magnetic ring 422 is larger than the diameter of the rotating shaft 21, the third magnetic ring 421 is fixed on the second cover plate 12 and rotationally connected with the rotating shaft 21, the fourth magnetic ring 422 is fixed on the magnetic conducting ring 22 and rotates with the rotating shaft 21, the third magnetic ring 421 and the fourth magnetic ring 422 are magnetized along the thickness direction and the magnetization directions are opposite.

[0035] In the embodiment, the first cover plate 11 and the second cover plate 12 are respectively provided with a first through hole 111 and a second through hole 121 penetrating along the axial direction of the rotating shaft 21, the first magnetic ring 411 and the third magnetic ring 421 are respectively fixedly embedded inside the first through hole 111 and the second through hole 121.

[0036] In the embodiment, the magnetic conducting ring 22 comprises a first magnetic conducting ring 221 and a second magnetic conducting ring 222, the first magnetic conducting ring 221 and the second magnetic conducting ring 222 are arranged along the axial direction of the rotating shaft 21, the first magnetic steel 231 is sleeved and fixed on the first magnetic conducting ring 221, the second magnetic steel 232 is sleeved and fixed on the second magnetic conducting ring 222, the second magnetic ring 412 is fixedly embedded on the side of the first magnetic conducting ring 221 close to the first cover plate 11, and the fourth magnetic ring 422 is fixedly embedded on the side of the second magnetic conducting ring 222 close to the second cover plate 12.

[0037] In the embodiment, the step motor 100 further comprises a first bearing 51 and a second bearing 52 sleeved on the rotating shaft 21 and rotationally connected with the rotating shaft 21, the first bearing 51 comprises a first bearing body 511 fixed in the first through hole 111, a second bearing body 512 extending in the direction away from the first cover plate 11 and parallel to the axial direction of the rotating shaft 21, and a first limiting ring 513 extending radially from the outer circumferential side of the second bearing body 512 and away from the rotating shaft 21, the first bearing body 511 is abuttingly fixed on the side of the first magnetic ring 411 away from the first magnetic steel 231, and the first limiting ring 513 is abuttingly fixed on the side of the first cover plate 11 away from the first magnetic steel 231.

[0038] The second bearing 52 includes a third bearing body 521 fixed in the second through hole 121, a fourth bearing body 522 extending in parallel with the shaft 21 in the direction away from the second cover plate 12, and a second limiting ring 523 extending radially from the outer periphery of the fourth bearing body 522 in the direction away from the shaft 21, the third bearing body 521 abutting and fixed to the side of the third magnetic ring 421 away from the second magnetic steel 232, and the second limiting ring 523 abutting and fixed to the side of the second cover plate 12 away from the second magnetic steel 232.

[0039] In the embodiment, the two ends of the shaft 21 respectively penetrate the first cover plate 11 and the second cover plate 12 and are rotationally connected with the first cover plate 11 and the second cover plate 12 respectively.

[0040] In the embodiment, the first cover plate 11 is rotationally connected with the shaft 21 through the first bearing body 511, the second bearing body 512, and the first magnetic ring 411, and the second cover plate 12 is rotationally connected with the shaft 21 through the third bearing body 521, the fourth bearing body 522, and the third magnetic ring 422.

[0041] In the embodiment, the first driving unit 31 includes a first cylindrical framework 311, a first coil 312, and a first stator magnetic ring 313, the first stator magnetic ring 313 is arranged around the first magnetic steel 231 in the radial direction of the shaft 21 and abuts and is fixed to the side of the first cover plate 11 facing the second cover plate 12, the first stator magnetic ring 313 includes a first claw-shaped half body 3131 and a second claw-shaped half body 3132, the first claw-shaped half body 3131 and the second claw-shaped half body 3132 are opposite and clamped to form a cylindrical first receiving space 314, the first cylindrical framework 311 is fixed in the first receiving space 314, and the first coil 312 is wound around the outer periphery of the first cylindrical framework 311.

[0042] In the embodiment, the second driving unit 32 includes a second cylindrical framework 321, a second coil 322, and a second stator magnetic ring 323, the second stator magnetic ring 323 is arranged around the second magnetic steel 232 in the radial direction of the shaft 21 and abuts and is fixed to the side of the second cover plate 12 facing the first cover plate 11, the second stator magnetic ring 323 includes a third claw-shaped half body 3231 and a fourth claw-shaped half body 3232, the third claw-shaped half body 3231 and the fourth claw-shaped half body 3232 are opposite and clamped to form a cylindrical second receiving space 324, the second cylindrical framework 321 is fixed in the second receiving space 324, and the second coil 322 is wound around the outer periphery of the second cylindrical framework 321.

[0043] In the embodiment, the first claw-shaped half 3131 comprises a side wall 31311, a top wall 31312 extending from the side of the side wall 31311 close to the first cover plate 11 to the rotating shaft 21 in the radial direction of the rotating shaft 21, and a plurality of first claw poles 31313 extending from the side of the top wall 31312 close to the rotating shaft 21 to the direction away from the top wall 31312 in the axial direction of the rotating shaft 21, the second claw-shaped half 3132 comprises a base 31321 and a plurality of second claw poles 31322 extending from the side of the base 31321 close to the rotating shaft 21 to the direction away from the base 31321 in the axial direction of the rotating shaft 21. The plurality of first claw poles 31313 and the plurality of second claw poles 31322 are arranged in staggered engagement, so that the magnetic field is stable.

[0044] In the embodiment, the third claw-shaped half 3231 comprises a second side wall 32311, a second top wall 32312 extending from the side of the second side wall 32311 close to the second cover plate 12 to the rotating shaft 21 in the radial direction of the rotating shaft 21, and a plurality of third claw poles 32313 extending from the side of the second top wall 32312 close to the rotating shaft 21 to the direction away from the second top wall 32312 in the axial direction of the rotating shaft 21, the fourth claw-shaped half 3232 comprises a second base 32321 and a plurality of fourth claw poles 32322 extending from the side of the second base 32321 close to the rotating shaft 21 to the direction away from the base 32321 in the axial direction of the rotating shaft 21. The plurality of third claw poles 32313 and the plurality of fourth claw poles 32322 are arranged in staggered engagement, so that the magnetic field is stable.

[0045] The top wall 31312 abuts against the first cover plate 11, the second top wall 32312 abuts against the second cover plate 12, and the base 31321 and the second base 32321 abut against each other.

[0046] Compared with the prior art, the application effectively strengthens the axial constraint of the motor rotor by adding a non-contact magnetic force spring on the rotating shaft of the rotor, which can eliminate the movement, and the non-contact magnetic force spring does not have physical contact with the rotating shaft and does not introduce additional friction, so that the output torque is better than that of the existing contact type coil spring or elastic washer, and the motor operating noise is greatly reduced.

[0047] 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, which are all within the protection scope of the application.

Claims

1. A stepper motor comprising a first cover plate, a second cover plate, a stator assembly and a rotor assembly clamped between the first cover plate and the second cover plate, the rotor assembly being arranged between and rotatably connected to the first cover plate and the second cover plate, the stator assembly being arranged around the rotor assembly in an axial direction of the rotor assembly; the rotor assembly comprising a rotating shaft, a magnetic conducting ring fixedly sleeved on the rotating shaft, and a magnetic steel fixedly sleeved on the magnetic conducting ring; the stator assembly comprising a first driving unit and a second driving unit arranged in abutment along the axial direction of the rotating shaft, the first driving unit being fixed in abutment on a side of the first cover plate facing the second cover plate, the second driving unit being fixed in abutment on a side of the second cover plate facing the first cover plate, the first driving unit and the second driving unit being arranged around the magnetic steel in a radial direction of the rotating shaft; characterized in that the stepper motor further comprises a first magnetic force spring sleeved on the rotating shaft, the first magnetic force spring comprising a first magnetic ring in the shape of a ring and a second magnetic ring arranged in abutment with the first magnetic ring, the first magnetic ring and the second magnetic ring having an inner diameter greater than a diameter of the rotating shaft; the first magnetic ring being fixed on the first cover plate and rotatably connected to the rotating shaft, the second magnetic ring being fixed on the magnetic conducting ring and rotatably connected to the rotating shaft, the first magnetic ring and the second magnetic ring being magnetized in opposite directions along a thickness direction.

2. The stepper motor of claim 1, wherein, the stepper motor further comprises a second magnetic force spring sleeved on the rotating shaft, the second magnetic force spring comprising a third magnetic ring in the shape of a ring and a fourth magnetic ring arranged in abutment with the third magnetic ring, the third magnetic ring and the fourth magnetic ring having an inner diameter greater than a diameter of the rotating shaft, the third magnetic ring being fixed on the second cover plate and rotatably connected to the rotating shaft, the fourth magnetic ring being fixed on the magnetic conducting ring and rotatably connected to the rotating shaft, the third magnetic ring and the fourth magnetic ring being magnetized in opposite directions along a thickness direction.

3. The stepper motor of claim 2, wherein, the magnetic steel comprises a first magnetic steel and a second magnetic steel, the first magnetic steel and the second magnetic steel being arranged in abutment along the axial direction of the rotating shaft, the first driving unit being arranged around the first magnetic steel in the radial direction of the rotating shaft, the second driving unit being arranged around the second magnetic steel in the radial direction of the rotating shaft.

4. The stepper motor of claim 3, wherein, the first cover plate and the second cover plate are respectively provided with a first through hole and a second through hole penetrating in the axial direction of the rotating shaft, the first magnetic ring and the third magnetic ring being respectively fixedly embedded in the first through hole and the second through hole.

5. The stepper motor of claim 4, wherein, the magnetic conducting ring comprises a first magnetic conducting ring and a second magnetic conducting ring, the first magnetic conducting ring and the second magnetic conducting ring being arranged in abutment along the axial direction of the rotating shaft, the first magnetic steel being fixedly sleeved on the first magnetic conducting ring, the second magnetic steel being fixedly sleeved on the second magnetic conducting ring, the second magnetic ring being fixedly embedded on a side of the first magnetic conducting ring close to the first cover plate, the fourth magnetic ring being fixedly embedded on a side of the second magnetic conducting ring close to the second cover plate.

6. The stepper motor of claim 5, wherein, The step motor further comprises a first bearing and a second bearing sleeved on the rotating shaft and rotatably connected with the rotating shaft, the first bearing comprises a first bearing body fixed in the first through hole, a second bearing body extending in the axial direction of the rotating shaft away from the first cover plate from the first bearing body, and a first limiting ring extending in the radial direction away from the rotating shaft from the outer circumferential side of the second bearing body, the first bearing body is abutted and fixed to one side of the first magnetic ring away from the first magnetic steel, and the first limiting ring is abutted and fixed to one side of the first cover plate away from the first magnetic steel; The second bearing comprises a third bearing body fixed in the second through hole, a fourth bearing body extending in the axial direction of the rotating shaft away from the second cover plate from the third bearing body, and a second limiting ring extending in the radial direction away from the rotating shaft from the outer circumferential side of the fourth bearing body, the third bearing body is abutted and fixed to one side of the third magnetic ring away from the second magnetic steel, and the second limiting ring is abutted and fixed to one side of the second cover plate away from the second magnetic steel.

7. The stepper motor of claim 6, wherein, The first cover plate is rotatably connected with the rotating shaft through the first bearing body, the second bearing body and the first magnetic ring, and the second cover plate is rotatably connected with the rotating shaft through the third bearing body, the fourth bearing body and the third magnetic ring.

8. The stepper motor of claim 1, wherein, The first driving unit comprises a first cylindrical framework, a first coil and a first stator magnetic ring, the first stator magnetic ring is arranged around the first magnetic steel in the radial direction of the rotating shaft and is abutted and fixed to one side of the first cover plate facing the second cover plate, the first stator magnetic ring comprises a first claw-shaped half and a second claw-shaped half, the first claw-shaped half and the second claw-shaped half are opposite and clamped to form a cylindrical first receiving space, the first cylindrical framework is fixed in the first receiving space, and the first coil is arranged on the outer circumferential side of the first cylindrical framework; The second driving unit comprises a second cylindrical framework, a second coil and a second stator magnetic ring, the second stator magnetic ring is arranged around the second magnetic steel in the radial direction of the rotating shaft and is abutted and fixed to one side of the second cover plate facing the first cover plate, the second stator magnetic ring comprises a third claw-shaped half and a fourth claw-shaped half, the third claw-shaped half and the fourth claw-shaped half are opposite and clamped to form a cylindrical second receiving space, the second cylindrical framework is fixed in the second receiving space, and the second coil is arranged on the outer circumferential side of the second cylindrical framework.

9. The stepper motor of claim 8, wherein, The first claw-shaped half comprises a side wall, a top wall extending in the radial direction of the rotating shaft away from the rotating shaft from one side of the side wall close to the first cover plate, and a plurality of first claw poles extending in the axial direction of the rotating shaft away from the top wall from one side of the top wall close to the rotating shaft, and the second claw-shaped half comprises a base and a plurality of second claw poles extending in the axial direction of the rotating shaft away from the base from one side of the base close to the rotating shaft.

10. The stepper motor of claim 9, wherein, The plurality of first claw poles and the plurality of second claw poles are arranged in an interlocking manner.

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