Stepping motor

Abstract

Provided in the present invention is a stepping motor, comprising a first cover plate, a second cover plate, and a stator and a rotor sandwiched between the first cover plate and the second cover plate, wherein the stator surrounds the rotor and is spaced apart from the rotor; the stator has a plurality of claw poles extending in the axial direction of the rotor; and the rotor is supported on and forms rotational connections with the first cover plate and the second cover plate. The rotor comprises a rotating shaft and a rotor steel magnet assembly sleeved and fixed on the rotating shaft; the rotor steel magnet assembly comprises a first rotor steel magnet assembly and a second rotor steel magnet assembly that are spaced apart from each other, each of the first and second rotor steel magnet assemblies comprising an annular rotor magnetic ring sleeved and fixed on the rotating shaft, and a rotor steel magnet sleeved and fixed on the periphery of the rotor magnetic ring. The stator comprises first and second drive units respectively fixed to the first cover plate and the second cover plate, the first drive unit surrounding the first rotor steel magnet, and the second drive unit surrounding the second rotor steel magnet. Compared with the related art, the present invention reduces torque ripple in the stepping motor.

Description

Stepping motor TECHNICAL FIELD

[0001] The present application relates to a motor device, in particular to a stepping motor. BACKGROUND

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

[0003] The stepping motor generally comprises a rotor and a stator, and the claw pole type stepping motor is provided with claw poles matched with each other on the rotor. By setting different polarities of the claw poles, the torque of the rotor can be improved. The magnetic density of the claw pole of the claw pole type stepping motor in the related art is relatively saturated due to the torque requirement, so that the torque fluctuation of the stepping motor is large, which affects the actual motor performance.

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

[0005] The technical problem to be solved by the present application is to provide a stepping motor with small torque fluctuation.

[0006] To solve the above technical problems, the present application provides a stepping motor, comprising a first cover plate, a second cover plate, and a stator and a rotor clamped between the first cover plate and the second cover plate, the stator surrounds the rotor and is arranged in spaced relation with the rotor, the stator has a plurality of claw poles extending in the axial direction of the rotor, and the rotor is supported by the first cover plate and the second cover plate and is rotationally connected with the first cover plate and the second cover plate.

[0007] The rotor comprises a rotating shaft and a rotor magnet assembly fixedly sleeved on the rotating shaft.

[0008] The rotor magnet assembly comprises a first rotor magnet assembly and a second rotor magnet assembly arranged in spaced relation in the axial direction of the rotating shaft, the first rotor magnet assembly comprises a first rotor magnet ring in the form of a ring fixedly sleeved on the rotating shaft, and a first rotor magnet fixedly sleeved on the outer periphery of the first rotor magnet ring; the second rotor magnet assembly comprises a second rotor magnet ring in the form of a ring fixedly sleeved on the rotating shaft, and a second rotor magnet fixedly sleeved on the outer periphery of the second rotor magnet ring.

[0009] The stator comprises a first driving unit and a second driving unit distributed along the axial direction of the rotor, the first driving unit is fixed to the first cover plate and surrounds the first rotor magnet, and the second driving unit is fixed to the second cover plate and surrounds the second rotor magnet.

[0010] Preferably, the rotor magnet assembly further comprises a spacer ring fixed to the shaft and located between the first rotor magnet assembly and the second rotor magnet assembly.

[0011] Preferably, the outer diameter of the first rotor magnet ring is the same as that of the second rotor magnet ring, the outer diameter of the spacer ring is smaller than that of the first rotor magnet ring, and the inner diameters of the first rotor magnet ring, the second rotor magnet ring and the spacer ring are the same.

[0012] Preferably, the inner diameters of the first rotor magnet and the second rotor magnet are the same, and the outer diameters of the first rotor magnet and the second rotor magnet are the same.

[0013] Preferably, the radial lengths of the first rotor magnet and the second rotor magnet are the same as the radial lengths of the first rotor magnet ring and the second rotor magnet ring.

[0014] Preferably, the two ends of the shaft respectively penetrate the first cover plate and the second cover plate and form rotational connections with the first cover plate and the second cover plate respectively.

[0015] Preferably, the step motor further comprises a first bearing and a second bearing, the first cover plate and the second cover plate are provided with grooves at the rotational connection positions with the shaft, the outer periphery of the first bearing is fixed to the groove of the first cover plate, the outer periphery of the second bearing is fixed to the groove of the second cover plate, and the two ends of the shaft are respectively inserted into the inner periphery of the first bearing and the inner periphery of the second bearing.

[0016] Preferably, the stator comprises a plurality of claw-shaped halves, and each claw-shaped half has a plurality of claw poles.

[0017] Preferably, the first driving unit comprises a first cylindrical framework, a first coil and a first stator magnet ring, the first stator magnet ring is sleeved on the rotor and fixedly connected with the first cover plate, the first stator magnet 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 to each other and jointly form a cylindrical first receiving space, the first cylindrical framework is fixed in the first receiving space, and the first coil is wound around the outer periphery of the first cylindrical framework.

[0018] Preferably, the second driving unit comprises a second cylindrical framework, a second coil and a second stator magnetic ring, the second stator magnetic ring is sleeved on the rotor and fixedly connected with the second 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 to each other and jointly form a cylindrical second accommodating space, the second cylindrical framework is fixed in the second accommodating space, and the second coil is arranged on the outer periphery of the second cylindrical framework. Advantages

[0019] Compared with the prior art, the step motor comprises a first cover plate, a second cover plate and a stator and a rotor clamped between the first cover plate and the second cover plate, the stator surrounds the rotor and is arranged in a spaced manner with the rotor, the stator has a plurality of claw poles extending in the axial direction of the rotor, the rotor is supported on the first cover plate and the second cover plate and is rotationally connected with the first cover plate and the second cover plate, and the stator is arranged in a spaced manner around the rotor; the rotor comprises a rotor shaft supported on the first cover plate and the second cover plate and rotationally connected with the first cover plate and the second cover plate, and a rotor magnetic steel assembly sleeved and fixed on the rotor shaft; the rotor magnetic steel assembly comprises a first rotor magnetic steel assembly and a second rotor magnetic steel assembly arranged in a spaced manner in the axial direction of the rotor shaft, the first rotor magnetic steel assembly comprises a first annular rotor magnetic ring sleeved and fixed on the rotor shaft, and a first rotor magnetic steel sleeved and fixed on the outer periphery of the first rotor magnetic ring; the second rotor magnetic steel assembly comprises a second annular rotor magnetic ring sleeved and fixed on the rotor shaft, and a second rotor magnetic steel sleeved and fixed on the outer periphery of the second rotor magnetic ring; the stator comprises a first driving unit and a second driving unit distributed in the axial direction of the rotor, the first driving unit is fixed on the first cover plate and arranged around the first rotor magnetic ring, and the second driving unit is fixed on the second cover plate and arranged around the second rotor magnetic ring. In the above structure, the rotor magnetic steel adopts a segmented structure, different rotor magnetic steels correspond to different driving units, compared with the scheme of a single rotor magnetic steel, the volume is reduced, thereby reducing the torque fluctuation of the rotor in the step motor, at the same time, the segmented rotor magnetic steel structure can also reduce the rotor moment of inertia and the cogging torque, improve the motor response speed, the pull-in torque output torque, and reduce the noise of the motor operation. 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 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 also be obtained from these drawings without creative labor.

[0021] Fig. 1 is a perspective structural schematic view of a stepping motor according to an embodiment of the present application;

[0022] Fig. 2 is a sectional view along line A-A in Fig. 1;

[0023] Fig. 3 is a perspective structural exploded schematic view of a stepping motor according to an embodiment of the present application. Embodiments of the present application

[0024] 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 some of the embodiments of the present application, but not 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 efforts fall within the scope of protection of the present application.

[0025] Referring to Figs. 1-3, a stepping motor 100 according to an embodiment of the present application comprises a first cover plate 1, a second cover plate 2, and a stator 4 and a rotor 3 clamped between the first cover plate 1 and the second cover plate 2. The stator 4 surrounds the rotor 3 and is spaced apart from the rotor 3. The stator 4 has a plurality of claw poles extending along an axial direction of the rotor 3. The rotor 3 is supported by the first cover plate 1 and the second cover plate 2 and rotationally connected to the first cover plate 1 and the second cover plate 2.

[0026] The rotor 3 comprises a rotating shaft 31 and a rotor magnet assembly 32 fixedly sleeved on the rotating shaft 31.

[0027] The rotor magnet assembly 32 comprises a first rotor magnet assembly 321 and a second rotor magnet assembly 322 spaced apart along an axial direction of the rotating shaft 31. The first rotor magnet assembly 321 comprises a first rotor magnet ring 3211 in a ring shape fixedly sleeved on the rotating shaft 31, and a first rotor magnet 3212 sleeved and fixed on an outer periphery of the first rotor magnet ring 3211. The second rotor magnet assembly 322 comprises a second rotor magnet ring 3221 in a ring shape fixedly sleeved on the rotating shaft 31, and a second rotor magnet 3222 sleeved and fixed on an outer periphery of the second rotor magnet ring 3221.

[0028] The stator 4 comprises a first driving unit 41 and a second driving unit 42 distributed along an axial direction of the rotor 3. The first driving unit 41 is fixed to the first cover plate 1 and arranged around the first rotor magnet 3212. The second driving unit 42 is fixed to the second cover plate 2 and arranged around the second rotor magnet 3222.

[0029] Through the arrangement, the structure of the rotor magnet steel assembly 32 as a whole corresponds to the driving units of the stator part, and there is no connection part that cannot correspond between different driving units when a single rotor magnet steel assembly structure is arranged, so that the rotation torque of the rotor can be reduced.

[0030] The rotor magnet steel assembly 32 further comprises a spacer 323 fixedly sleeved on the rotating shaft 31 and located between the first rotor magnet steel assembly 321 and the second rotor magnet steel assembly 322.

[0031] The outer diameter of the first rotor magnet ring 3211 is the same as that of the second rotor magnet ring 3221, the outer diameter of the spacer is smaller than that of the first rotor magnet ring 3211, and the inner diameters of the first rotor magnet ring 3211, the second rotor magnet ring 3221 and the spacer are the same. The same inner diameter allows the rotating shaft 31 to fit the magnet ring and the spacer, thereby ensuring the connection effect.

[0032] The inner diameters of the first rotor magnet steel 3212 and the second rotor magnet steel 3222 are the same, and the outer diameters of the first rotor magnet steel 3212 and the second rotor magnet steel 3222 are the same.

[0033] The radial lengths of the first rotor magnet steel 3212 and the second rotor magnet steel 3222 are the same as the radial lengths of the first rotor magnet ring 3211 and the second rotor magnet ring 3221. The rotor magnet steel with the same radial length and outer diameter can ensure the stability of the rotor rotation and the performance of the motor.

[0034] The first rotor magnet ring 3211 and the second rotor magnet ring 3221 are made of magnetic conductive material.

[0035] The first rotor magnet steel 3212 and the first rotor magnet ring 3211, and the second rotor magnet steel 3222 and the second rotor magnet ring 3221 are connected and fixed by glue or clamping.

[0036] Both ends of the rotating shaft 31 pass through the first cover plate 1 and the second cover plate 2 respectively, and are rotatably connected with the first cover plate 1 and the second cover plate 2 respectively.

[0037] The step motor 100 further comprises a first bearing 5 and a second bearing 6. The rotating connection parts of the first cover plate 1 and the second cover plate 2 with the rotating shaft 31 are provided with grooves, the outer circumferential side of the first bearing 5 is fixed in the groove of the first cover plate 1, and the outer circumferential side of the second bearing 6 is fixed in the groove of the second cover plate 2; both ends of the rotating shaft 31 are respectively inserted and fixed on the inner circumferential side of the first bearing 5 and the inner circumferential side of the second bearing 6.

[0038] The stator 4 comprises a plurality of claw-shaped halves having a plurality of claw poles.

[0039] The first driving unit 41 comprises a first cylindrical skeleton 411, a first coil 412, and a first stator magnetic ring 413, the first stator magnetic ring 413 being sleeved on the rotor 3 and fixedly connected with the first cover plate 1, the first stator magnetic ring 413 comprising a first claw-shaped half 4131 and a second claw-shaped half 4132, the first claw-shaped half 4131 and the second claw-shaped half 4132 being opposite to each other and jointly forming a cylindrical first receiving space, the first cylindrical skeleton 411 being fixed in the first receiving space, and the first coil 412 being wound around the outer periphery of the first cylindrical skeleton 411. A plurality of first claw poles 41311 on the first claw-shaped half 4131 and a plurality of second claw poles 41321 on the second claw-shaped half 4132 are staggered when arranged, so that the magnetic field is stable.

[0040] The second driving unit 42 comprises a second cylindrical skeleton 421, a second coil 422, and a second stator magnetic ring 423, the second stator magnetic ring 423 being sleeved on the rotor 3 and fixedly connected with the second cover plate 2, the second stator magnetic ring 423 comprising a third claw-shaped half 4231 and a fourth claw-shaped half 4232, the third claw-shaped half 4231 and the fourth claw-shaped half 4232 being opposite to each other and jointly forming a cylindrical second receiving space, the second cylindrical skeleton 421 being fixed in the second receiving space, and the second coil 422 being wound around the outer periphery of the second cylindrical skeleton 421. A plurality of third claw poles 42311 on the third claw-shaped half 4231 and a plurality of fourth claw poles 42321 on the fourth claw-shaped half 4232 are staggered when arranged, so that the magnetic field is stable.

[0041] Compared with the related art, the stepping motor comprises a first cover plate, a second cover plate, a stator and a rotor clamped between the first cover plate and the second cover plate, the stator surrounds the rotor and is spaced apart from the rotor, the stator has a plurality of claw poles extending along the rotor in the axial direction, the rotor is supported on the first cover plate and the second cover plate and is rotationally connected with the first cover plate and the second cover plate, and the stator is spaced apart and surrounds the rotor; the rotor comprises a rotor shaft supported on the first cover plate and the second cover plate and rotationally connected with the first cover plate and the second cover plate, and a rotor magnet assembly fixedly sleeved on the rotor shaft; the rotor magnet assembly comprises a first rotor magnet assembly and a second rotor magnet assembly spaced apart along the axial direction of the rotor shaft, the first rotor magnet assembly comprises a first annular rotor magnet ring fixedly sleeved on the rotor shaft, and a first rotor magnet sleeved and fixed on the outer periphery of the first rotor magnet ring; the second rotor magnet assembly comprises a second annular rotor magnet ring fixedly sleeved on the rotor shaft, and a second rotor magnet sleeved and fixed on the outer periphery of the second rotor magnet ring; the stator comprises a first driving unit and a second driving unit distributed along the axial direction of the rotor, the first driving unit is fixed on the first cover plate and surrounds the first rotor magnet ring, and the second driving unit is fixed on the second cover plate and surrounds the second rotor magnet ring. In the above structure, the rotor magnet adopts a segmented structure, different rotor magnets correspond to different driving units, compared with the scheme of a single rotor magnet, the volume is reduced, thereby reducing the torque fluctuation of the rotor in the stepping motor, at the same time, the segmented rotor magnet structure can also reduce the rotor moment of inertia and the cogging torque, improve the motor response speed, the pull-in torque output torque, and reduce the noise of the motor operation.

[0042] The above only describes the embodiments of the present application, and it should be noted 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 present application.

Claims

1. A stepper motor comprising: The first cover plate, the second cover plate, and a stator and a rotor sandwiched between the first cover plate and the second cover plate, the stator surrounds the rotor and is spaced apart from the rotor, the stator has a plurality of claw poles extending along the rotor in the axial direction, and the rotor is supported by the first cover plate and the second cover plate and is rotationally connected to the first cover plate and the second cover plate; The rotor comprises a rotating shaft and a rotor magnet assembly fixedly sleeved on the rotating shaft, characterized in that The rotor magnet assembly comprises a first rotor magnet assembly and a second rotor magnet assembly spaced apart along the axial direction of the rotating shaft, the first rotor magnet assembly comprises a first annular rotor magnet ring fixedly sleeved on the rotating shaft and a first rotor magnet fixedly sleeved on the outer periphery of the first rotor magnet ring, and the second rotor magnet assembly comprises a second annular rotor magnet ring fixedly sleeved on the rotating shaft and a second rotor magnet fixedly sleeved on the outer periphery of the second rotor magnet ring. The stator comprises a first driving unit and a second driving unit distributed along the axial direction of the rotor, the first driving unit is fixed to the first cover plate and surrounds the first rotor magnet, and the second driving unit is fixed to the second cover plate and surrounds the second rotor magnet.

2. The stepper motor of claim 1, wherein, The rotor magnet assembly further comprises a spacer ring fixedly sleeved on the rotating shaft and located between the first rotor magnet assembly and the second rotor magnet assembly.

3. The stepper motor of claim 2, wherein, The outer diameter of the first rotor magnet ring is the same as the outer diameter of the second rotor magnet ring, the outer diameter of the spacer ring is smaller than the outer diameter of the first rotor magnet ring, and the inner diameters of the first rotor magnet ring, the second rotor magnet ring, and the spacer ring are the same.

4. The stepper motor of claim 3, wherein, The inner diameters of the first rotor magnet and the second rotor magnet are the same, and the outer diameters of the first rotor magnet and the second rotor magnet are the same.

5. The stepper motor of claim 3, wherein, The radial lengths of the first rotor magnet, the second rotor magnet, the first rotor magnet ring, and the second rotor magnet ring are the same.

6. The stepper motor of claim 1, wherein, Both ends of the rotating shaft pass through the first cover plate and the second cover plate and are rotationally connected to the first cover plate and the second cover plate, respectively.

7. The stepper motor of claim 1, wherein, The step motor further comprises a first bearing and a second bearing, the first cover plate and the second cover plate are provided with grooves at the rotationally connected positions of the rotating shaft, the outer periphery of the first bearing is fixed to the groove of the first cover plate, the outer periphery of the second bearing is fixed to the groove of the second cover plate, and both ends of the rotating shaft are respectively inserted and fixed to the inner periphery of the first bearing and the inner periphery of the second bearing.

8. The stepper motor of claim 1, wherein, The stator comprises a plurality of claw-shaped halves, and each claw-shaped half has a plurality of claw poles.

9. The stepper motor of claim 8, wherein, The first driving unit comprises a first cylindrical framework, a first coil, and a first stator magnet ring, the first stator magnet ring is sleeved on the rotor and fixedly connected to the first cover plate, the first stator magnet 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 to each other and jointly form a cylindrical first receiving space, the first cylindrical framework is fixed in the first receiving space, and the first coil is wound around the outer periphery of the first cylindrical framework.

10. The stepper motor of claim 8, wherein, The second driving unit comprises a second cylindrical framework, a second coil and a second stator magnetic ring, the second stator magnetic ring is sleeved on the rotor and fixedly connected with the second 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 to each other and jointly form a cylindrical second containing space, the second cylindrical framework is fixed in the second containing space, and the second coil is wound on the outer periphery of the second cylindrical framework.

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