Stepper motor

Abstract

The present application relates to the technical field of motors, and in particular to a stepper motor. The stepper motor in embodiments of the present application comprises: a rotor assembly, wherein the rotor assembly comprises a rotating shaft and a plurality of magnetic steel units sequentially assembled along the circumferential direction of the rotating shaft, the inner wall of each magnetic steel unit abuts against the outer wall of the rotating shaft, and the plurality of magnetic steel units are assembled to form a magnetic steel component; a stator assembly sleeved outside the rotor assembly; and support assemblies each comprising a bearing sleeved on the rotating shaft, wherein the rotating shaft comprises a main body portion connected to the magnetic steel component and two end portions respectively arranged at both ends of the main body portion, each bearing is sleeved on the corresponding end portion, and the diameter of the main body portion is smaller than the diameter of each end portion. In the present application, the plurality of magnetic steel units are sequentially assembled along the circumferential direction of the rotating shaft, and the inner wall of each magnetic steel unit abuts against the outer wall of the rotating shaft, thereby being beneficial to increasing the structural strength of the rotating shaft; and the rotating shaft comprises the main body portion connected to the magnetic steel component and the end portions matching the bearings, and the diameter of each end portion is greater than the diameter of the main body portion, thereby being beneficial to increasing the structural strength of the rotating shaft.

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] The stepping motor is increasingly miniaturized, and the size of the rotating shaft is further reduced. In the prior art, the fixing mode of the magnetic steel and the rotating shaft is mostly that the rotating shaft is inserted into the magnetic steel, and glue is applied in the gap between the rotating shaft and the magnetic steel to fix the rotating shaft and the magnetic steel. When the size of the rotating shaft is further reduced, the above fixing mode causes the structural strength of the rotating shaft to decrease. TECHNICAL PROBLEM

[0003] The purpose of the present application is to provide a stepping motor to solve the above technical problem of being not conducive to improving the structural strength of the rotating shaft. TECHNICAL SOLUTION

[0004] The technical solution of the present application is as follows: the embodiment of the present application provides a stepping motor, which comprises:

[0005] a rotor assembly, the rotor assembly comprising a rotating shaft and a plurality of magnetic steel units sequentially spliced along the circumference of the rotating shaft, the inner wall of the magnetic steel unit abutting against the outer wall of the rotating shaft, and the plurality of magnetic steel units being spliced to form a magnetic steel;

[0006] a stator assembly, the stator assembly being sleeved outside the rotor assembly, the stator assembly comprising a fixed claw pole arranged outside the circumference of the magnetic steel and a coil sleeved outside the fixed claw pole;

[0007] a support assembly, two support assemblies being respectively arranged at both ends of the rotor assembly, the support assembly comprising a bearing sleeved on the rotating shaft;

[0008] the rotating shaft comprising a main body part connected with the magnetic steel and two end parts respectively arranged at both ends of the main body part, the bearing being sleeved on the end part, and the diameter of the main body part being smaller than the diameter of the end part.

[0009] Optionally, the bearing is a ball bearing or a sliding bearing.

[0010] Optionally, the support assembly further comprises an end cover, the end cover being connected with the rotating shaft through the bearing, and the rotating shaft rotating relative to the end cover.

[0011] Optionally, the top and bottom of the magnetic steel are respectively provided with a gasket, the gasket being sleeved on the end part, and the diameter of the outer periphery of the gasket being equal to the diameter of the outer periphery of the magnetic steel.

[0012] Optionally, the bearing comprises an inner ring connected to the end portion, an outer ring arranged around the outer periphery of the inner ring, and a plurality of balls arranged between the inner ring and the outer ring, the outer periphery of the inner ring is formed with a first ball guide groove matched with the balls, the inner periphery of the outer ring is formed with a second ball guide groove matched with the balls, and the first ball guide groove and the second ball guide groove jointly form a receiving cavity for accommodating the balls.

[0013] Optionally, the stator assembly further comprises a shell sleeved on the coil.

[0014] The shell comprises a plurality of shell walls connected in sequence along the circumference of the coil, two of the plurality of shell walls are configured as first shell walls, the outer wall of the first shell wall is planar, the first shell wall is formed with a hollow portion for avoiding the coil, a part of the coil is accommodated in the hollow portion, and the two first shell walls are oppositely arranged.

[0015] Optionally, the part of the coil accommodated in the hollow portion is formed with a first plane parallel to the outer wall of the first shell wall.

[0016] Optionally, the shell comprises four shell walls connected in sequence along the circumference of the coil, the shell further comprises a second shell wall and a third shell wall, the outer wall of the second shell wall is arc-shaped, and the second shell wall and the third shell wall are oppositely arranged.

[0017] The third shell wall comprises a plurality of shell wall segments connected in sequence along the circumference of the coil, and the outer wall of each shell wall segment is planar.

[0018] The stepper motor further comprises a circuit board fixed on the third shell wall, and the circuit board comprises a plurality of circuit board units matched with the plurality of shell wall segments, respectively.

[0019] Optionally, the stepper motor comprises a plurality of stator assemblies and a plurality of shells sleeved outside the plurality of stator assemblies, respectively, the plurality of stator assemblies are arranged in sequence along the axial direction of the rotor assembly, and the plurality of shells are arranged in sequence along the axial direction of the rotor assembly.

[0020] Optionally, the fixed claw pole comprises a first claw pole portion and a second claw pole portion oppositely arranged and matched with each other,

[0021] The first claw pole portion comprises a first base sleeved on the rotating shaft and a first claw extending from the edge of the first base along the axial direction of the rotating shaft and bent towards the second claw pole portion, and the first claw is distributed along the circumference of the first base.

[0022] The second claw pole part comprises a second base sleeved on the rotating shaft and a second pole claw extending from the edge of the second base along the axial direction of the rotating shaft towards the first base, and the second pole claws are distributed along the axial direction of the second base at intervals;

[0023] The first pole claws and the second pole claws extend alternately, each first pole claw is located between two adjacent second pole claws, and the first pole claws and the second pole claws form a pole claw ring, and the coil is sleeved on the outer periphery of the pole claw ring. Advantages

[0024] The step motor of the embodiment of the application comprises a rotor assembly, a stator assembly and a support assembly. The rotor assembly comprises a rotating shaft and a plurality of magnetic steel units connected in sequence along the circumferential direction of the rotating shaft, the inner wall of the magnetic steel unit abuts against the outer wall of the rotating shaft, and the plurality of magnetic steel units are connected to form a magnetic steel. The stator assembly is sleeved outside the rotor assembly and comprises a fixed claw pole arranged outside the magnetic steel and a coil sleeved outside the fixed claw pole. The support assembly comprises a bearing sleeved on the rotating shaft. The rotating shaft comprises a main body connected to the magnetic steel and two end portions respectively arranged at the two ends of the main body, the bearing is sleeved on the end portion, and the diameter of the main body is smaller than the diameter of the end portion. In this way, the plurality of magnetic steel units are connected in sequence along the circumferential direction of the rotating shaft, the inner wall of the magnetic steel unit abuts against the outer wall of the rotating shaft, and the diameter of the end portion of the rotating shaft is greater than the diameter of the main body, so that the structural strength of the rotating shaft is increased. BRIEF DESCRIPTION OF DRAWINGS

[0025] FIG. 1 is a perspective view of a step motor according to an embodiment of the application.

[0026] FIG. 2 is a side view of the step motor shown in FIG. 1.

[0027] FIG. 3 is a sectional view of the step motor shown in FIG. 2 along the A-A direction.

[0028] FIG. 4 is a sectional view of the step motor shown in FIG. 2 along the B-B line.

[0029] FIG. 5 is an exploded view of the step motor shown in FIG. 1.

[0030] FIG. 6 is an exploded view of a rotor assembly of the step motor shown in FIG. 1.

[0031] FIG. 7 is an exploded view of a bearing of the step motor shown in FIG. 1.

[0032] FIG. 8 is a structural view of a stator assembly of the step motor shown in FIG. 1.

[0033] Figure 9 is a view of the cooperation between the housing and the coil in the stepping motor shown in Figure 1.

[0034] Figure 10 is a view of the structure of the fixed claw pole in the stepping motor shown in Figure 1.

[0035] Figure 11 is a perspective view of a stepping motor according to an embodiment of the present application.

[0036] Figure 12 is a sectional view of the stepping motor shown in Figure 11.

[0037] Figure 13 is an exploded view of the structure of the stepping motor shown in Figure 11.

[0038] The meanings of the reference signs in the drawings are as follows:

[0039] 10 - rotor assembly; 101 - rotating shaft; 1011 - main body part; 1012 - end part; 102 - magnetic steel; 1021 - magnetic steel unit; 1021a - inner wall; 1021b - side wall; 102a - first magnetic pole; 102b - second magnetic pole; 103 - gasket; 20 - stator assembly; 201 - housing; 2011 - first housing wall; 211 - hollowed part; 2012 - second housing wall; 2013 - third housing wall; 2013a - housing wall segment; 202 - coil; 2021 - first plane; 20a - fixed claw pole; 203 - first claw pole part; 2031 - first base; 2032 - first claw pole; 204 - second claw pole part; 2041 - second base; 2042 - second claw pole; 20b - claw pole ring; 205 - cylindrical adhesive layer; 30 - circuit board; 301 - circuit board unit; 40 - support assembly; 401 - end cover; 402 - bearing; 4021 - inner ring; 4022 - outer ring; 4023 - rolling ball; 4024 - first rolling ball guide groove; 4025 - second rolling ball guide groove. Embodiments of the present application

[0040] The present application will be further described below with reference to the drawings and embodiments.

[0041] It should be noted that the terms "first", "second", and "third" and the like in the description and in the claims of the present application as well as above-mentioned drawings are intended to distinguish different objects and not to describe a particular sequential order. Moreover, the terms "comprises", "comprising", "includes", "including" and the like are to be construed in an inclusive rather than an exclusive sense, that is, in the sense of "including, but not limited to". For example, a process, method, object, or apparatus that comprises a list of steps or elements is not necessarily limited to the listed steps or elements, but can include additional steps or elements not expressly listed or inherent to such process, method, object, or apparatus.

[0042] All directional indications, such as upper, lower, left, right, front, back, inner, outer, top, bottom, etc., are intended to facilitate the understanding of relative positions between components in a particular orientation (as shown in the drawings) and are not intended to limit the scope of the application. When an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or can have a middle element therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or can have a middle element therebetween.

[0043] An embodiment of the application provides a stepping motor, please refer to figures 1-5, the stepping motor comprises a rotor assembly 10, one or more stator assemblies 20, a circuit board 30 and a support assembly 40.

[0044] Wherein, please refer to figures 3-5, the rotor assembly 10 comprises a rotating shaft 101 and a magnetic steel 102, the magnetic steel 102 is sleeved outside the rotating shaft 101, and the magnetic steel 102 and the rotating shaft 101 can integrally rotate.

[0045] Wherein, please refer to figures 3-6, the magnetic steel 102 comprises a plurality of magnetic steel units 1021 which are sequentially spliced along the circumference of the rotating shaft 101, the inner wall 1021a of the magnetic steel unit 1021 abuts against the outer wall 101a of the rotating shaft 101, the plurality of magnetic steel units 1021 are spliced to form the magnetic steel 102, and the side walls 1021b of two adjacent magnetic steel units 1021 are in contact.

[0046] Wherein, figures 1, 3, 5 and 11-13 respectively take the plurality of stator assemblies 20 as examples, the plurality of stator assemblies 20 are sequentially and layerwisely arranged along the axial direction of the rotor assembly 10, each stator assembly 20 is spacedly sleeved outside the rotor assembly 10, specifically, the stator assembly 20 is spacedly sleeved outside the magnetic steel 102, the stator assembly 20 comprises an outer shell 201, a coil 202 and a fixed claw pole 20a, the fixed claw pole 20a is arranged around the outer periphery of the rotor assembly 10, the coil 202 is sleeved and fixed on the fixed claw pole 20a, and the outer shell 201 is sleeved outside the coil 202.

[0047] Wherein, the support assembly 40 is provided with two, the two support assemblies 40 are respectively arranged at the two ends of the rotor assembly 10, the support assembly 40 comprises an end cover 401 and a bearing 402, the end cover 401 is connected with the rotating shaft 101 through the bearing 402, the bearing 402 is sleeved on the rotating shaft 101, the end cover 401 is sleeved on the outer periphery of the bearing 402, and the rotating shaft 101 can rotate relative to the end cover 401.

[0048] As shown in FIGS. 3, 5 and 6, the rotating shaft 101 comprises a main body 1011 connected with the magnetic steel 102 and two end portions 1012 respectively arranged at two ends of the main body 1011, and the bearing 402 is sleeved on the end portion 1012. The diameter D1 of the main body 1011 is smaller than the diameter D2 of the end portion 1012.

[0049] In the embodiment, the plurality of magnetic steel units are sequentially spliced along the circumference of the rotating shaft, and the inner wall of the magnetic steel unit abuts against the outer wall of the rotating shaft, which is conducive to increasing the structural strength of the rotating shaft. The rotating shaft comprises the main body connected with the magnetic steel and the end portion matched with the bearing, and the diameter of the end portion is larger than that of the main body, which is conducive to increasing the structural strength of the rotating shaft.

[0050] As an implementation form, the bearing 402 can be a sliding bearing, as shown in FIGS. 11-13.

[0051] As an implementation form, the bearing 402 can be a ball bearing, as shown in FIGS. 1, 3 and 5. In the implementation form, the rotating shaft is supported by the ball bearing with a small size, which is conducive to reducing the friction loss of the rotating shaft.

[0052] In some embodiments, as shown in FIGS. 3 and 5, the top and bottom of the magnetic steel 102 are respectively provided with a gasket 103, the gasket 103 is annular and sleeved on the end portion 1012 of the rotating shaft 101, the gasket 103 is located between the magnetic steel 102 and the bearing 402, and the diameter of the outer periphery of the gasket 103 is equal to that of the magnetic steel 102. In the implementation form, the gasket and the outer periphery have the same size as the outer periphery of the magnetic steel, which is conducive to increasing the bonding strength of the gasket and the magnetic steel.

[0053] In some embodiments, as shown in FIGS. 5 and 7, the bearing 402 is a ball bearing, and the bearing 402 comprises an inner ring 4021, an outer ring 4022 and a plurality of balls 4023. The inner ring 4021 is connected to the end portion 1012, the outer ring 4022 is arranged around the outer periphery of the inner ring 4021, and the plurality of balls 4023 are arranged between the inner ring 4021 and the outer ring 4022. The outer periphery of the inner ring 4021 is formed with a first ball guide groove 4024 matched with the balls 4023, the inner periphery of the outer ring 4022 is formed with a second ball guide groove 4025 matched with the balls 4023, the first ball guide groove 4024 and the second ball guide groove 4025 jointly form a containing cavity for containing the balls 4023, and the plurality of balls 4023 roll in the containing cavity. The longitudinal section of the first ball guide groove 4024 and the longitudinal section of the second ball guide groove 4025 are respectively arc-shaped 402a, and the shape of the arc-shaped 402a is consistent with the shape of the balls 4023. In the implementation form, the inner ring 4021 rotates with the rotating shaft 101, and the rotating shaft 101 does not rotate relative to the inner ring 4021, which is conducive to reducing the friction loss of the rotating shaft.

[0054] As an implementation, referring to FIGS. 4, 8 and 9, the shell 201 includes a plurality of shell walls connected in sequence along the circumference of the coil 202, two of the plurality of shell walls are configured as first shell walls 2011, the outer wall of the first shell wall 2011 is planar, and the first shell wall 2011 is formed with a hollowed portion 211 for avoiding the coil 202, a part of the coil 202 is accommodated in the hollowed portion 211, and the two first shell walls 2011 are oppositely arranged. In this embodiment, by arranging two of the plurality of shell walls as the first shell walls, since the first shell wall is formed with the hollowed portion for avoiding the coil, and a part of the coil is accommodated in the hollowed portion, the size of the stepping motor in the direction S1 perpendicular to the outer wall of the first shell wall can not include the thickness of the two first shell walls, the size of the stepping motor in the direction S1 perpendicular to the outer wall of the first shell wall is reduced, which is conducive to the miniaturization of the stepping motor; in addition, since the outer wall of the first shell wall is planar, when the stepping motor is assembled, this planar surface is easy to cooperate with other components, which is conducive to reducing the assembly difficulty of the stepping motor.

[0055] In some embodiments, referring to FIGS. 8 and 9, the part of the coil 202 accommodated in the hollowed portion 211 is formed with a first plane 2021 parallel to the outer wall of the first shell wall 2011, and the first plane 2021 is located on the outer wall of the coil 202. In this embodiment, the outer wall of the part of the coil located in the hollowed portion is processed into a plane, compared with the arc surface before processing, the size in the direction S1 perpendicular to the outer wall of the first shell wall is further reduced, which is conducive to the miniaturization of the stepping motor; or, the saved space can be used to increase the number of turns of the coil or increase the thickness of the claw pole or increase the size of the magnetic steel, to further improve the torque performance.

[0056] In some embodiments, referring to FIGS. 8 and 9, the shell 201 includes four shell walls connected in sequence along the circumference of the coil 202, and the shell 201 further includes a second shell wall 2012 and a third shell wall 2013 with arc-shaped outer walls, and the second shell wall 2012 and the third shell wall 2013 are oppositely arranged. The cross section of the outer wall of the second shell wall 2012 is arc-shaped and protrudes away from the direction of the rotating shaft 101. In this embodiment, by arranging the second shell wall with the arc-shaped outer wall, it is suitable for application scenarios that require cooperation with arc surfaces.

[0057] In some embodiments, referring to FIGS. 4 and 9, the third shell wall 2013 includes a plurality of shell wall segments 2013a connected in sequence along the circumference of the coil 202, and the outer wall of each shell wall segment 2013a is planar. The circuit board 30 is fixed on the third shell wall 2013, and the circuit board 30 includes a plurality of circuit board units 301 respectively cooperating with the plurality of shell wall segments 2013a. Exemplarily, the number of shell wall segments 2013a can be three.

[0058] In the embodiment, each circuit board unit of the circuit board is more easily attached to the corresponding shell wall segment in a planar manner, and the circuit board can be fixed without the need of setting a pin, which is conducive to further miniaturization of the stepper motor. In the embodiment, the outgoing line of the coil can be spot-welded with the circuit board by using a lead, and the outgoing line of the circuit board does not need to be cut off on the third shell wall, so as to improve the structural strength of the stepper motor.

[0059] As an embodiment, referring to FIGS. 7 to 9, the fixed claw pole 20a includes a first claw pole part 203 and a second claw pole part 204 which are oppositely arranged and cooperated with each other. The first claw pole part 203 includes a first base 2031 sleeved on the rotating shaft 101 and a first pole claw 2032 which is bent and extends from the edge of the first base 2031 along the axial direction of the rotating shaft 101 towards the second claw pole part 204, and the first pole claws 2032 are spaced apart along the circumferential direction of the first base 2031; the second claw pole part 204 includes a second base 2041 sleeved on the rotating shaft 101 and a second pole claw 2042 which is bent and extends from the edge of the second base 2041 along the axial direction of the rotating shaft 101 towards the first base 2031, and the second pole claws 2042 are spaced apart along the axial direction of the second base 2041; the first pole claws 2032 and the second pole claws 2042 are staggered, each first pole claw 2032 is located between two adjacent second pole claws 2042, and the first pole claws 2032 and the second pole claws 2042 form a pole claw ring 20b, and the coil 202 is sleeved on the pole claw ring 20b.

[0060] In some embodiments, referring to FIGS. 3 and 10, the plurality of first pole claws 2032 are uniformly distributed on the inner periphery of the first base 2031, and there is a spacing between two adjacent first pole claws 2032; the plurality of second pole claws 2042 are uniformly distributed on the inner periphery of the second base 2041, and there is a spacing between two adjacent second pole claws 2042; when the coil 202 is sleeved on the pole claw ring 20b, the coil 202 is located between the first base 2031 and the second base 2041; when the shell 201 is sleeved on the coil 202, the outer periphery of the first base 2031 and the outer periphery of the second base 2041 respectively abut against the inner wall of the shell 201.

[0061] In some embodiments, referring to FIG. 5, the outer surface of the magnetic steel 102 is formed with a plurality of first magnetic poles 102a and a plurality of second magnetic poles 102b which are staggered along the circumferential direction of the magnetic steel 102, the outer walls of two adjacent magnetic steel units 1021 are respectively the first magnetic pole 102a and the second magnetic pole 102b, the first magnetic pole 102a and the second magnetic pole 102b are magnetically opposite, for example, one is N pole and the other is S pole.

[0062] In some embodiments, referring to FIG. 10, when the first claw pole portion 203 and the second claw pole portion 204 are matched with each other, the plurality of first pole claws 2032 of the first claw pole portion 203 and the plurality of second pole claws 2042 of the second claw pole portion 204 are arranged in an interpenetrating manner, i.e. the second pole claws 2042 are arranged in the interval regions between two adjacent first pole claws 2032, and the first pole claws 2032 and the second pole claws 2042 are arranged in correspondence with the first magnetic pole 102a or the second magnetic pole 102b of the magnetic steel. For the same stator assembly 20, the magnetic properties of the first pole claws 2032 and the second pole claws 2042 are opposite, e.g. one is N pole and the other is S pole. Further, the first pole claws 2032 and the second pole claws 2042 are arranged at equal intervals, and the widths of the first pole claws 2032 and the second pole claws 2042 gradually decrease along the respective extending directions.

[0063] In some embodiments, referring to FIGS. 3 and 4, a cylindrical glue layer 205 is further arranged between the pole claw ring 20b and the coil 202.

[0064] The above only describes the embodiments of the present application, and it should be pointed out that those skilled in the art can make improvements without departing from the creative concept of the present application, and these improvements are within the protection scope of the present application.

Claims

1. A stepper motor characterized by comprising: The application relates to a stepping motor. The stepping motor comprises a rotor assembly, a stator assembly and a support assembly. The rotor assembly comprises a rotating shaft and a plurality of magnetic steel units which are sequentially connected along the circumference of the rotating shaft. The inner wall of the magnetic steel unit is in abutment with the outer wall of the rotating shaft. The plurality of magnetic steel units are connected to form a magnetic steel.

2. The stepper motor of claim 1, wherein, The stator assembly is arranged outside the rotor assembly.

3. The stepper motor of claim 2, wherein, The stator assembly comprises fixed claw poles arranged outside the magnetic steel and coils arranged outside the fixed claw poles.

4. The stepper motor of claim 3, wherein, The support assembly comprises bearings arranged outside the rotating shaft.

5. The stepper motor of claim 2, wherein, The rotating shaft comprises a main body connected with the magnetic steel and two end portions arranged at the two ends of the main body.

6. The stepper motor of claim 1, wherein, The bearings are arranged outside the end portions. The diameter of the main body is smaller than the diameter of the end portions.

7. The stepper motor of claim 6, wherein, The bearings are ball bearings or sliding bearings.

8. The stepper motor of claim 6, wherein, The support assembly further comprises end covers connected with the rotating shaft through the bearings. The rotating shaft rotates relative to the end covers. The top and bottom of the magnetic steel are provided with gaskets.

9. A stepper motor according to any one of claims 1 to 8, characterised in that, The gaskets are arranged outside the end portions. The outer periphery of the gaskets has the same diameter as the outer periphery of the magnetic steel. The bearings comprise inner rings connected with the end portions, outer rings arranged outside the inner rings and balls arranged between the inner rings and the outer rings. The outer periphery of the inner ring is provided with first ball guide grooves matched with the balls. The inner periphery of the outer ring is provided with second ball guide grooves matched with the balls. The first ball guide grooves and the second ball guide grooves jointly form accommodating cavities for accommodating the balls. The stator assembly further comprises a shell arranged outside the coils. The shell comprises a plurality of shell walls connected along the circumference of the coils. Two of the shell walls are configured as first shell walls. The outer wall of the first shell wall is in a plane shape. The first shell wall is provided with a hollow portion for avoiding the coils. The coils are arranged in the hollow portion. The coils arranged in the hollow portion are provided with first planes parallel to the outer wall of the first shell wall. The shell comprises four shell walls connected along the circumference of the coils. The shell further comprises second shell walls and third shell walls. The third shell wall comprises a plurality of shell wall segments connected along the circumference of the coils. The outer wall of each shell wall segment is in a plane shape. The stepping motor further comprises a circuit board fixed on the third shell wall. The circuit board comprises a plurality of circuit board units matched with the plurality of shell wall segments. The stepping motor comprises a plurality of stator assemblies and a plurality of shells arranged outside the stator assemblies. 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The first claw The first claw pole part comprises a first base sleeved on the rotating shaft and a first pole claw bent and extended from the edge of the first base along the axial direction of the rotating shaft towards the second claw pole part, the first pole claw being spaced along the circumferential direction of the first base; The second claw pole part comprises a second base sleeved on the rotating shaft and a second pole claw bent and extended from the edge of the second base along the axial direction of the rotating shaft towards the first base, the second pole claw being spaced along the axial direction of the second base; The first pole claw and the second pole claw are staggered, each first pole claw being located between two adjacent second pole claws, and the first pole claw and the second pole claw form a pole claw ring, the coil being sleeved on the outer periphery of the pole claw ring.

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