Three-phase permanent magnet synchronous motor and vacuum cleaner having the same

Abstract

The present invention provides a three-phase permanent magnet synchronous motor and a vacuum cleaner having the same. The three-phase permanent magnet synchronous motor includes a first stator core, the first stator core has a first stator tooth; a second stator core, the second stator core has a second stator tooth, and the second stator core is separately arranged from the first stator core; wherein, there are multiple first stator teeth, the number of the second stator teeth is the same as the number of the first stator teeth, the first stator teeth and the second stator teeth are arranged to form a working chamber for accommodating a rotor part, and the number of the first stator teeth is n, n=3t, and t is a positive integer. The present application provides a new three-phase permanent magnet synchronous motor structure, which can reduce the difficulty of winding by arranging the core part of the motor in a split manner, thereby improving the production efficiency of the motor structure. At the same time, the motor can reduce the volume and weight of the stator core through the stator block arrangement, effectively reducing the manufacturing cost of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of compressor equipment, and in particular to a three-phase permanent magnet synchronous motor and a vacuum cleaner having the same. Background Art

[0002] In the prior art, the commonly used small-sized high-speed three-phase permanent magnet motors have an integrated motor stator structure, and the motor is a whole. However, due to the small size of the small-sized high-speed three-phase permanent magnet motor, the inner diameter of the motor stator is small, which makes the stator winding difficult, resulting in poor processability during motor manufacturing and reduced motor efficiency. Summary of the invention

[0003] The main purpose of the present invention is to provide a three-phase permanent magnet synchronous motor and a vacuum cleaner having the same, so as to solve the problem of difficulty in motor winding in the prior art.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided a three-phase permanent magnet synchronous motor, comprising: a first stator core, the first stator core having first stator teeth; a second stator core, the second stator core having second stator teeth, the second stator core and the first stator core being separately arranged; wherein, there are a plurality of first stator teeth, the number of the second stator teeth is the same as the number of the first stator teeth, the first stator teeth and the second stator teeth are arranged to form a working cavity for accommodating a rotor part, the number of the first stator teeth is n, n=3t, and t is a positive integer.

[0005] Further, the number of turns of the three-phase winding on the first stator teeth of the first stator core is the same, and / or the number of turns of the three-phase winding on the second stator teeth of the second stator core is the same.

[0006] Furthermore, the first stator core is an axisymmetric structure, and the first stator core and the second stator core are also axisymmetrically distributed in space.

[0007] Further, t=1, an intersection point of a first tooth body of a plurality of first stator teeth and a geometric center line along a radial direction of the rotor part is arranged away from the geometric center of the rotor part, and / or an intersection point of a second tooth body of a plurality of second stator teeth and a geometric center line along a radial direction of the rotor part is arranged away from the geometric center of the rotor part.

[0008] Furthermore, the intersection of the geometric center lines of the multiple first tooth bodies is located on the side of the rotor part away from the first stator tooth, and the distance between the intersection of the geometric center lines of the multiple first tooth bodies and the geometric center of the rotor part is a, where e<a<3e, e is the thickness of the first tooth body.

[0009] Furthermore, 2e<a<2.5e.

[0010] Furthermore, the included angle formed by the geometric center lines of the outermost first tooth bodies of the plurality of first stator teeth is θ, wherein 0.4π / m<θ<0.8π / m, and m is the number of the parts of the motor stator core.

[0011] Furthermore, a uniform air gap structure is formed between the first stator teeth and the rotor portion, and a uniform air gap structure is formed between the second stator teeth and the rotor portion.

[0012] Furthermore, the tooth top of at least one of the first stator tooth and the second stator tooth includes: a first straight segment, the end surface of the first straight segment facing the rotor part is a plane; an arc segment, the first end of the arc segment is connected to the first straight segment; a second straight segment, the first end of the second straight segment is connected to the second end of the arc segment, and the end surface of the second straight segment facing the rotor part is a plane.

[0013] Furthermore, the center of the arc segment is arranged to coincide with the geometric center of the rotor part.

[0014] Further, a minimum distance between at least one of the first straight segment and the second straight segment and a geometric center of the rotor portion is L, wherein 1.05r<L<1.25r, and r is a radius of a rotor of the rotor portion.

[0015] Furthermore, at least one of the first stator core and the second stator core is provided with a protruding structure at one end away from the rotor part, and a through hole is provided in the middle of the protruding structure.

[0016] Further, a positioning groove is provided at one end of at least one of the first stator core and the second stator core away from the rotor part.

[0017] Furthermore, an arc-shaped groove is provided at one end of at least one of the first stator core and the second stator core, which is away from the rotor part, and the arc-shaped groove is spaced apart from the positioning groove.

[0018] Further, the depth of the positioning groove along the radial direction of the rotor part is d, wherein 0.3b<d<0.5b, and b is the thickness of the first tooth body of the first stator tooth or the second tooth body of the second stator tooth.

[0019] Furthermore, the positioning groove has a groove bottom and a side wall, and the angle between the groove bottom and the side wall is Φ, wherein 45 degrees <Φ < 75 degrees.

[0020] Further, the width of the slot bottom is c, wherein 0.6M<c<0.85M, M is the width of the tooth shoe of the first stator tooth, and / or, M is the width of the tooth shoe of the second stator tooth.

[0021] According to another aspect of the present invention, there is provided a vacuum cleaner, comprising a three-phase permanent magnet synchronous motor, wherein the three-phase permanent magnet synchronous motor is the three-phase permanent magnet synchronous motor described above.

[0022] By applying the technical solution of the present invention, the present application provides a new three-phase permanent magnet synchronous motor structure, which can reduce the difficulty of winding by arranging the iron core part of the motor into segments, and improve the production efficiency of the motor structure. At the same time, the motor can reduce the volume and weight of the stator core by arranging the stator segment, effectively reducing the manufacturing cost of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0024] Figure 1 A schematic structural diagram of a first embodiment of a three-phase permanent magnet synchronous motor structure according to the present invention is shown;

[0025] Figure 2 A schematic structural diagram of a second embodiment of a three-phase permanent magnet synchronous motor structure according to the present invention is shown;

[0026] Figure 3 Shows Figure 2 A is an enlarged structural diagram;

[0027] Figure 4 A schematic structural diagram of a fourth embodiment of a three-phase permanent magnet synchronous motor structure according to the present invention is shown;

[0028] Figure 5 A structural schematic diagram of a fifth embodiment of a three-phase permanent magnet synchronous motor structure according to the present invention is shown.

[0029] The above drawings include the following reference numerals:

[0030] 10. first stator core; 11. first stator tooth; 112. tooth shoe;

[0031] 20. second stator core; 21. second stator tooth; 212. tooth shoe;

[0032] 30. Rotor unit;

[0033] 41, first straight segment; 42, arc segment; 43, second straight segment;

[0034] 50. protrusion structure; 51. through hole;

[0035] 60. positioning groove; 61. groove bottom; 62. side wall;

[0036] 70. Arc-shaped groove. DETAILED DESCRIPTION

[0037] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0038] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0039] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0040] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of the layers and regions may be enlarged, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0041] Combination Figures 1 to 5 As shown, according to a specific embodiment of the present application, a three-phase permanent magnet synchronous motor is provided.

[0042] Specifically, Figure 1As shown, the three-phase permanent magnet synchronous motor (hereinafter referred to as the motor) includes a first stator core 10 and a second stator core 20. The first stator core 10 has a first stator tooth 11; the second stator core 20 has a second stator tooth 21, and the second stator core 20 and the first stator core 10 are separately arranged; wherein, there are multiple first stator teeth 11, and the number of the second stator teeth 21 is the same as the number of the first stator teeth 11, and the first stator teeth 11 and the second stator teeth 21 are arranged to form a working cavity for accommodating the rotor part 30, and the number of the first stator teeth 11 is n, n=3t, and t is a positive integer.

[0043] In this embodiment, the three-phase permanent magnet synchronous motor includes at least two completely separated stator cores of the same size and structure. A new three-phase permanent magnet synchronous motor structure is provided. The motor core part is arranged in a segmented manner, which can reduce the difficulty of winding and improve the production efficiency of the motor structure. At the same time, the motor can reduce the volume and weight of the stator core by arranging the stator segmented, effectively reducing the motor manufacturing cost.

[0044] In order to improve the performance of the motor, in this embodiment, the three-phase windings on the first stator teeth 11 of the first stator core 10 are arranged to have the same number of turns. The three-phase windings on the second stator teeth 21 of the second stator core 20 are also arranged to have the same number of turns. Figure 1 As shown, the first stator core 10 is an axisymmetric structure, and the first stator core 10 and the second stator core 20 are also axisymmetrically distributed in space. That is, the first stator core 10 and the second stator core 20 are axisymmetric structures, wherein the axisymmetric line is arranged along the radial direction of the rotor part 30. Specifically, the windings of the first stator tooth 11 and the second stator tooth 21 are both concentrated winding wires, and the number of winding turns on the first stator tooth 11 of the first stator core 10 is the same as the number of winding turns on the second stator tooth 21 of the second stator core 20.

[0045] like Figure 2 As shown, in one embodiment of the present application, t=1, the intersection of the geometric center line of the first tooth body of the plurality of first stator teeth 11 along the radial direction of the rotor part 30 is arranged away from the geometric center of the rotor part 30, and the intersection of the geometric center line of the second tooth body of the plurality of second stator teeth 21 along the radial direction of the rotor part 30 is arranged away from the geometric center of the rotor part 30. Such an arrangement can effectively improve the performance of the motor.

[0046] Specifically, Figure 2As shown, the intersection of the geometric center lines of the plurality of first tooth bodies is located on the side of the rotor portion 30 away from the first stator tooth 11, and the distance between the intersection of the geometric center lines of the plurality of first tooth bodies and the geometric center of the rotor portion 30 is a, wherein e<a<3e, and e is the thickness of the first tooth body. Of course, the structure of the second tooth body of the second stator tooth can also be set to be the same as the structure of the first tooth body. Preferably, 2e<a<2.5e.

[0047] In this embodiment, the angle formed between the geometric center lines of the outermost first tooth bodies of the plurality of first stator teeth 11 is θ, wherein 0.4π / m<θ<0.8π / m, and m is the number of the motor stator core. A uniform air gap structure is formed between the first stator teeth 11 and the rotor portion 30, and a uniform air gap structure is formed between the second stator teeth 21 and the rotor portion 30.

[0048] like Figure 3 As shown, the tooth top of at least one of the first stator tooth 11 and the second stator tooth 21 includes a first straight section 41, a circular arc section 42, and a second straight section 43. The end surface of the first straight section 41 facing the rotor part 30 is a plane. The first end of the circular arc section 42 is connected to the first straight section 41. The first end of the second straight section 43 is connected to the second end of the circular arc section 42, and the end surface of the second straight section 43 facing the rotor part 30 is a plane. This arrangement can also further improve the performance of the motor. Preferably, the center of the circular arc section 42 is arranged to coincide with the geometric center of the rotor part 30. The minimum distance between at least one of the first straight section 41 and the second straight section 43 and the geometric center of the rotor part 30 is L, wherein 1.05r<L<1.25r, and r is the radius of the rotor of the rotor part 30.

[0049] like Figure 5 As shown, in order to reduce the difficulty of motor assembly, a protrusion structure 50 is provided at one end of at least one of the first stator core 10 and the second stator core 20 away from the rotor part 30. A through hole 51 is opened in the middle of the protrusion structure 50. A positioning groove 60 is provided at one end of at least one of the first stator core 10 and the second stator core 20 away from the rotor part 30. The depth of the positioning groove 60 along the radial direction of the rotor part 30 is d, wherein 0.3b<d<0.5b, b is the thickness of the first tooth body of the first stator tooth 11 or the second tooth body of the second stator tooth 21. The positioning groove 60 has a groove bottom 61 and a side wall 62, and the angle between the groove bottom 61 and the side wall 62 is Φ, wherein 45deg<Φ<75deg. The width of the groove bottom 61 is c, where 0.6M<c<0.85M, M is the width of the tooth shoe 112 of the first stator tooth 11, and / or M is the width of the tooth shoe 212 of the second stator tooth 21. This arrangement can facilitate the assembly of the motor and improve the motor production efficiency.

[0050] like Figure 2 As shown, at least one of the first stator core 10 and the second stator core 20 is further provided with an arc groove 70 at one end away from the rotor part 30, and the arc groove 70 is arranged at a distance from the positioning groove 60. Such an arrangement can facilitate fixing of the motor.

[0051] Specifically, the motor structure of the present application solves the problem of difficulty in winding due to the small inner diameter of the motor stator in the prior art. The motor structure of the present application reduces the size and weight of the motor and saves costs. By arranging the stator in blocks, winding is simple and the processability is good.

[0052] Specifically, the motor has a concentrated winding structure, and the motor stator core is divided into at least two completely separated parts according to a certain rule. The stator is divided into blocks, wherein each stator core includes n stator teeth with armature windings, wherein n=3*t, and t is a positive integer. On these n stator teeth, the number of three-phase windings is the same. The stator core of a single block is a symmetrical structure, and there are three stator teeth on the stator core. The intersection point between the center lines of the tooth bodies of the three stator teeth of the motor is not at the same point as the axis center of the motor rotor shaft. The distance between the intersection point of the center lines of the tooth bodies of the motor stator teeth and the intersection point of the axis center of the rotating shaft is a, wherein e<a<3e. Further, the distance a can be narrowed to a range of 2e<a<2.5e, wherein e is the thickness of the tooth body of the motor stator teeth. The contour line of the air gap portion corresponding to a single stator tooth on the stator core is divided into three sections, wherein the middle section is an arc with its center on the rotor axis, and the other two sections of the contour line on both sides are straight lines, and the two straight line sections of the contour line are formed by cutting edges.

[0053] A raised structure is arranged on the yoke of the motor stator punching sheet, an arc-shaped groove is arranged on the surface of the raised structure, and a trapezoidal through hole is arranged in the middle of the raised structure. The raised structure is mainly used for motor installation, wherein the trapezoidal through hole is used to fix the position of the iron core, and the arc-shaped groove is used for welding and fixing multiple stator iron cores.

[0054] The commonly used small-scale high-speed three-phase permanent magnet motors have an integrated motor stator structure, and the motor is a whole. However, due to the small size of the small-scale high-speed three-phase permanent magnet motor, the inner diameter of the motor stator is small, which makes the stator winding difficult and the processability is poor during motor manufacturing.

[0055] The three-phase permanent magnet synchronous motor provided in the present application sets the motor stator to a block structure, which can effectively reduce the difficulty of stator winding. Specifically, the motor can be set to a 6-slot 4-pole structure. Figure 1As shown, the motor includes two block stators and a rotor part. Among them, the motor rotor part includes a plurality of permanent magnets attached to the rotating shaft, and the N and S poles of the motor permanent magnets are arranged alternately. Each stator core includes 3 stator teeth. Since the three stator teeth include a set of three-phase windings A, B, and C respectively, and since the sum of the currents of the three-phase windings is zero, the total magnetic flux generated by the three-phase windings on the stator core is zero, and the magnetic field generated by the three-phase windings on the stator core can form a loop. Therefore, this block method has little effect on the output torque of the motor. If the sum of the magnetic field on a single stator core is not zero, a large magnetic field loss will be generated on the core, the output torque of the motor will drop significantly, and the torque pulsation of the motor will be reduced.

[0056] Furthermore, in order to reduce the volume and weight of the motor stator core, the yokes of the two teeth on the outside of a single stator core of the motor are brought closer to the middle teeth, that is, the intersection of the center lines of the tooth bodies of the three stator teeth of the motor is not at the same point as the motor rotor axis. Since the tops of the motor teeth must be evenly distributed and their positions are fixed and cannot be changed, in order to reduce the weight and volume of the motor, the outer tooth yoke can only be brought closer to the middle tooth with the boot as the center while the tops of the teeth remain unchanged. A convex structure is provided on the periphery of the yoke of the motor stator punching sheet, and an arc-shaped groove is provided on the surface of the convex structure. Multiple pieces of iron core can be welded together at the arc-shaped groove by laser welding. At the same time, a trapezoidal through hole is provided in the middle of the convexity. The convex structure is mainly used for motor installation. The trapezoidal through hole is used to fix the position of the iron core, and can also prevent the magnetic field from entering the convex structure, thereby reducing the iron loss of the motor.

[0057] In another embodiment of the present application, the air gap structure of each stator tooth is a uniform air gap structure, that is, the air gap contour corresponding to a single stator tooth is an arc with its center on the rotor axis, such as Figure 4 As shown in B and C.

[0058] In another embodiment of the present application, no protruding structure is provided on the periphery of the yoke of the motor stator punching sheet, but a positioning groove structure is provided at the periphery of the central axis of the tooth body of the stator tooth, and a protruding portion cooperating therewith is provided on the inner side of the motor housing. The positioning groove structure is used for the installation and fixation of the stator core, and an arc groove is provided for the welding and fixation of the stator core, such as Figure 5 shown.

[0059] Furthermore, the depth of the positioning groove is d, and the structural dimension constraints of the positioning groove are as follows: 0.3*b<d<0.5*b, where b is the width of the tooth body of the stator tooth. The angle between the two sides of the positioning groove is Φ, where 45deg<Φ<75deg. The width of the bottom of the stator tooth groove is c, where 0.6M<c<0.85M, where M is the length of the two end vertices of the tooth boot of the stator tooth. This arrangement can further reduce the inner diameter of the motor, thereby reducing the overall size of the motor. At the same time, not providing a raised structure can also reduce part of the core weight, which can further improve the miniaturization and lightweight of the motor as a whole.

[0060] The three-phase permanent magnet synchronous motor in the above embodiment can also be used in the technical field of vacuum cleaner equipment. That is, according to another aspect of the present invention, a vacuum cleaner is provided, including a three-phase permanent magnet synchronous motor, and the three-phase permanent magnet synchronous motor is the three-phase permanent magnet synchronous motor in the above embodiment.

[0061] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0062] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present invention.

[0063] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A three-phase permanent magnet synchronous motor, characterized in that: include: A first stator core (10), wherein the first stator core (10) has a first stator tooth (11); A second stator core (20), the second stator core (20) having second stator teeth (21), the second stator core (20) and the first stator core (10) being arranged separately; There are a plurality of first stator teeth (11), the number of the second stator teeth (21) is the same as the number of the first stator teeth (11), the first stator teeth (11) and the second stator teeth (21) are arranged to form a working chamber for accommodating a rotor part (30), the number of the first stator teeth (11) is n, n=3t, and t is a positive integer.

2. The three-phase permanent magnet synchronous motor according to claim 1, characterized in that: The number of turns of the three-phase winding on the first stator tooth (11) of the first stator core (10) is the same, and / or the number of turns of the three-phase winding on the second stator tooth (21) of the second stator core (20) is the same.

3. The three-phase permanent magnet synchronous motor according to claim 2, characterized in that: The first stator core (10) is an axisymmetric structure, and the first stator core (10) and the second stator core (20) are also axisymmetrically distributed in space.

4. The three-phase permanent magnet synchronous motor according to claim 1, characterized in that: t=1, the intersection of the first tooth bodies of the plurality of first stator teeth (11) and the geometric center lines in the radial direction of the rotor part (30) is arranged away from the geometric center of the rotor part (30), and / or the intersection of the second tooth bodies of the plurality of second stator teeth (21) and the geometric center lines in the radial direction of the rotor part (30) is arranged away from the geometric center of the rotor part (30).

5. The three-phase permanent magnet synchronous motor according to claim 4, characterized in that: The intersection of the geometric center lines of the plurality of first tooth bodies is located on a side of the rotor portion (30) away from the first stator tooth (11), and the distance between the intersection of the geometric center lines of the plurality of first tooth bodies and the geometric center of the rotor portion (30) is a, wherein e<a<3e, and e is the thickness of the first tooth body.

6. The three-phase permanent magnet synchronous motor according to claim 5, characterized in that: 2e<a<2.5e.

7. The three-phase permanent magnet synchronous motor according to claim 4, characterized in that: The angle formed between the geometric center lines of the outermost first tooth bodies of the plurality of first stator teeth (11) is θ, wherein 0.4π / m<θ<0.8π / m, and m is the number of parts of the motor stator core.

8. The three-phase permanent magnet synchronous motor according to claim 4, characterized in that: A uniform air gap structure is formed between the first stator teeth (11) and the rotor part (30), and a uniform air gap structure is formed between the second stator teeth (21) and the rotor part (30).

9. The three-phase permanent magnet synchronous motor according to claim 1, characterized in that: A tooth top of at least one of the first stator tooth (11) and the second stator tooth (21) comprises: A first straight section (41), wherein an end surface of the first straight section (41) facing the rotor portion (30) is a plane; An arc segment (42), wherein a first end of the arc segment (42) is connected to the first straight segment (41); A second straight segment (43), wherein a first end of the second straight segment (43) is connected to a second end of the arc segment (42), and an end surface of the second straight segment (43) facing the rotor portion (30) is a plane.

10. The three-phase permanent magnet synchronous motor according to claim 9, characterized in that: The center of the circular arc segment (42) is arranged to coincide with the geometric center of the rotor part (30).

11. The three-phase permanent magnet synchronous motor according to claim 9, characterized in that: The minimum distance between at least one of the first straight segment (41) and the second straight segment (43) and the geometric center of the rotor part (30) is L, wherein 1.05r<L<1.25r, and r is the radius of the rotor of the rotor part (30).

12. The three-phase permanent magnet synchronous motor according to claim 1, characterized in that: At least one of the first stator core (10) and the second stator core (20) is provided with a protruding structure (50) at one end away from the rotor part (30), and a through hole (51) is provided in the middle of the protruding structure (50).

13. The three-phase permanent magnet synchronous motor according to claim 1, characterized in that: At least one of the first stator core (10) and the second stator core (20) is provided with a positioning groove (60) at one end away from the rotor part (30).

14. The three-phase permanent magnet synchronous motor according to claim 13, characterized in that: An arc-shaped groove (70) is further provided at one end of at least one of the first stator core (10) and the second stator core (20) away from the rotor part (30), and the arc-shaped groove (70) is spaced apart from the positioning groove (60).

15. The three-phase permanent magnet synchronous motor according to claim 13, characterized in that: The depth of the positioning groove (60) along the radial direction of the rotor part (30) is d, wherein 0.3b<d<0.5b, and b is the thickness of the first tooth body of the first stator tooth (11) or the second tooth body of the second stator tooth (21).

16. The three-phase permanent magnet synchronous motor according to claim 13, characterized in that: The positioning groove (60) comprises a groove bottom (61) and a side wall (62), wherein the angle between the groove bottom (61) and the side wall (62) is Φ, wherein 45 degrees < Φ < 75 degrees.

17. The three-phase permanent magnet synchronous motor according to claim 16, characterized in that: The width of the groove bottom (61) is c, wherein 0.6M<c<0.85M, M is the width of the tooth shoe (112) of the first stator tooth (11), and / or M is the width of the tooth shoe (212) of the second stator tooth (21).

18. A vacuum cleaner, comprising a three-phase permanent magnet synchronous motor, characterized in that: The three-phase permanent magnet synchronous motor is the three-phase permanent magnet synchronous motor according to any one of claims 1 to 17.

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