Electric motor, air supply assembly and air handling device

Abstract

Disclosed in the present application are an electric motor, an air supply assembly and an air handling device, the electric motor (10) comprising: a rotor assembly (200) and a stator assembly (100). The rotor assembly (200) is configured to rotate about a rotation axis (20), and the rotor assembly (200) comprises a plurality of permanent magnets (230) distributed around the rotation axis (20), wherein the plurality of permanent magnets (230) comprise first permanent magnets (230a) and second permanent magnets (230b), the first permanent magnets (230a) and the second permanent magnets (230b) being distributed on two opposite sides of the rotation axis (20); a first direction (X) is perpendicular to the rotation axis (20); and each first permanent magnet (230a) is provided with a first wall surface (231) facing away from the corresponding second permanent magnet (230b), each second permanent magnet (230b) is provided with a second wall surface (232) facing away from the corresponding first permanent magnet (230a), and the minimum distance between the first wall surface (231) and the second wall surface (232) is D1. The stator assembly (100) comprises stator cores (110), and the maximum outer diameter of each stator core (110) is D2, where 0.5≤D1 / D2≤0.6.

Description

Motors, air supply components and air handling devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application number 202311670605.7 filed on December 6, 2023, entitled “Motor, air supply assembly and air treatment device”. The entire contents of the above patent application are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of electric drive components, and in particular to a motor, an air supply assembly, and an air handling device. Background Art

[0004] Iron loss and stator winding AC loss are two major energy losses in motors. Iron loss refers to the loss caused by electromagnetic forces acting on the iron core during motor operation. It primarily consists of hysteresis loss and eddy current loss in the magnetic material. Hysteresis loss is caused by the constant shifting of the magnetization state of the iron core during motor operation, resulting in constant flipping of magnetic domains within the core and frictional heat generation. Eddy current loss is caused by the constant shifting of the magnetic field within the iron core during motor operation, which generates eddy currents within the core. These eddy currents are affected by resistance during their flow and result in losses. Stator winding AC loss refers to the loss caused by the resistance of the current flowing in the conductor during motor operation. It primarily consists of the resistance loss of the conductor itself and additional losses caused by the interaction of the magnetic field between the conductor and the iron core.

[0005] The AC losses and iron losses in the motor's stator windings differ under heavy and light loads, resulting in different motor efficiencies under these conditions. Related technologies often prioritize heavy-load efficiency, resulting in lower efficiency under light loads, or prioritize light-load efficiency, resulting in lower efficiency under heavy loads. When a motor operates under both heavy and light load conditions, regardless of whether the motor design prioritizes heavy or light load operation, its overall efficiency remains suboptimal under these conditions.

[0006] Summary of the Invention

[0007] The main purpose of this application is to propose a motor, an air supply assembly and an air handling device to at least partially solve one of the above technical problems.

[0008] An embodiment of a first aspect of the present application provides an electric motor, including a rotor assembly and a stator assembly.

[0009] The rotor assembly is configured to rotate about a rotation axis, and the rotor assembly includes a plurality of permanent magnets distributed about the rotation axis, the plurality of permanent magnets including a first permanent magnet and a second permanent magnet, the first permanent magnet and the second permanent magnet are distributed on opposite sides of the rotation axis along a first direction, the first direction is perpendicular to the rotation axis, the first permanent magnet has a first wall surface facing away from the second permanent magnet, the second permanent magnet has a second wall surface facing away from the first permanent magnet, and the minimum distance between the first wall surface and the second wall surface is D1.

[0010] The stator assembly includes a stator core, which includes a yoke and multiple teeth. The yoke is annular and is arranged around the outside of the rotor assembly. The teeth are distributed around the outside of the rotor assembly. One end of each tooth is connected to the inner circumferential wall of the yoke, and the other end is spaced apart from the rotor assembly. The maximum outer diameter of the stator core is D2.

[0011] Among them, 0.5≤D1 / D2≤0.6.

[0012] In some embodiments, 0.53≤D1 / D2≤0.57.

[0013] In some embodiments, 40 mm ≤ D1 ≤ 100 mm.

[0014] In some embodiments, 60 mm ≤ D1 ≤ 80 mm.

[0015] In some embodiments, the number of the teeth is N, N≥6, and the teeth have a third wall and a fourth wall arranged opposite to each other along the circumference of the rotation axis, and a minimum distance Wt between the third wall and the fourth wall satisfies:

[0016] In some embodiments, the number of the tooth portions is N, where N is greater than or equal to 6. The plurality of tooth portions include a first tooth portion and a second tooth portion that are adjacently arranged along the circumferential direction of the rotation axis. The first tooth portion includes a first end portion facing away from the yoke portion, and the second tooth portion includes a second end portion facing away from the yoke portion. The first end portion and the second end portion are spaced apart from each other along the circumferential direction, and a minimum spacing Wx between the first end portion and the second end portion satisfies:

[0017] In some embodiments, the tooth portion has a third wall surface on one side along the circumferential direction of the rotation axis, the third wall surface has a first intersection line with the inner circumferential wall, the maximum outer diameter of the outer circumferential wall of the yoke portion is the maximum outer diameter of the stator core, and the minimum distance We between the first intersection line and the outer circumferential wall of the yoke portion satisfies:

[0018] In some embodiments, the tooth portion has a third wall surface and a fourth wall surface that are arranged relative to each other along the circumference of the rotation axis, and the minimum distance between the third wall surface and the fourth wall surface is Wt; the multiple tooth portions include a first tooth portion and a second tooth portion that are adjacently arranged along the circumference of the rotation axis, the first tooth portion includes a first end portion facing away from the yoke portion, and the second tooth portion includes a second end portion facing away from the yoke portion, and along the circumference, the first end portion and the second end portion are spaced apart, and the minimum distance between the first end portion and the second end portion is Wx; the rotor assembly also includes a rotor core and a rotating shaft, the rotor core includes an inner core and an outer core, and the inner core It is annular and arranged around the rotation axis, and the rotation shaft passes through the inner iron core; the outer iron core includes a plurality of iron core units distributed around the inner iron core, and along the circumference of the rotation axis, each of the iron core units and each of the permanent magnets are alternately arranged one by one; and the plurality of iron core units include a first iron core unit and a second iron core unit adjacent to each other along the circumference of the rotation axis, the first iron core unit includes a third end facing away from the inner iron core, the second iron core unit includes a fourth end facing away from the inner iron core, the third end and the fourth end are arranged at intervals, and the minimum spacing K between the third end and the fourth end satisfies: Wx≤K≤Wt.

[0019] In some embodiments, the core units are disconnected from each other along the circumferential direction, and ends of the core units close to the inner core are disconnected from the inner core.

[0020] In some embodiments, the rotor assembly further includes an injection molding portion, which fills a gap between the outer iron core and the inner iron core and connects the outer iron core and the inner iron core.

[0021] In some embodiments, the stator core includes a plurality of laminations stacked in a direction parallel to the rotation axis, and the laminations satisfy one of the following conditions a)-d):

[0022] a) The laminate is configured to be integrally stamped from a first sheet;

[0023] b) the laminations are configured to be formed by splicing a plurality of core monomers distributed circumferentially along the rotation axis, the core monomers are configured to be integrally stamped from the second sheet, and the core monomers include at least one tooth portion;

[0024] c) the laminations are configured to be formed by an intermediate body in a strip shape being annularly bent along the circumference of the rotation axis and connected end to end, and the intermediate body is configured to be integrally stamped from a third sheet;

[0025] d) The lamination is provided with a limiting portion, which forms a recess on one side wall of the lamination along the second direction and a protrusion on the other side wall of the lamination along the second direction, and the second direction is parallel to the rotation axis.

[0026] In some embodiments, the stator assembly further includes a coil winding sleeved on each of the teeth, and the coil winding is a copper wire winding.

[0027] In some embodiments, the stator assembly further includes a coil winding sleeved on each of the teeth, and the coil winding is an aluminum wire winding.

[0028] An embodiment of the second aspect of the present application further provides an air supply assembly, comprising the motor described in any one of the above items.

[0029] An embodiment of the third aspect of the present application further provides an air treatment device, comprising the above-mentioned air supply assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0031] FIG1 is a side view schematic diagram of a stator core, a rotor core, and a permanent magnet assembly in a motor according to an embodiment of the present application; wherein the viewing angle is parallel to the second direction;

[0032] FIG2 is a side view schematic diagram of a stator core in a motor according to an embodiment of the present application; wherein the viewing angle is parallel to the second direction;

[0033] FIG3 is a partial enlarged schematic diagram of point A1 in FIG2 ;

[0034] FIG4 is a side view schematic diagram of a rotor assembly in one embodiment of the present application; wherein the viewing angle is parallel to the second direction;

[0035] FIG5 is a side view schematic diagram of each permanent magnet assembly in one embodiment of the present application; wherein the viewing angle is parallel to the second direction;

[0036] FIG6 is a side view schematic diagram of a stator core in one embodiment of the present application; wherein the viewing angle is parallel to the second direction;

[0037] FIG7 is a partial enlarged schematic diagram of point A2 in FIG6;

[0038] FIG8 is a partial enlarged schematic diagram of point A3 in FIG6 ;

[0039] FIG9 is a side view schematic diagram of an iron core lamination in one embodiment of the present application; wherein the viewing angle is parallel to the second direction;

[0040] FIG10 is a perspective schematic diagram of a stator core in one embodiment of the present application;

[0041] FIG11 is a schematic side view of the inner core in one embodiment of the present application; wherein the viewing angle is parallel to the second direction;

[0042] FIG12 is a perspective schematic diagram of a stator assembly in one embodiment of the present application; wherein the stator assembly includes an injection molding portion;

[0043] FIG13 is a schematic side view of a laminate according to an embodiment of the present application; wherein the viewing angle is parallel to the second direction;

[0044] FIG14 is a schematic side view of a laminate according to an embodiment of the present application; wherein the viewing angle is parallel to the second direction;

[0045] FIG15 is a schematic side view of a stator core in one embodiment of the present application; wherein the viewing angle is parallel to the second direction, and the inner core and the outer core of the stator core are connected; and

[0046] FIG16 is a graph showing D1 / D2 and motor efficiency in one embodiment of the present application, wherein the motor high-speed heavy-load efficiency curve, low-speed light-load efficiency curve, and comprehensive average efficiency curve are shown.

[0047] Description of Figure Numbers:

[0048] 10-motor;

[0049] 100-stator assembly;

[0050] 110 - stator core; 111 - yoke; 1111 - second injection molding groove; 1112 - limiting portion; 112 - tooth portion;

[0051] 1121 - first end; 1122 - second end; 1123 - third wall; 1124 - fourth wall; 1125 - first boundary line; 112a - first tooth portion; 112b - second tooth portion; 113 - lamination;

[0052] 200-rotor assembly;

[0053] 210 - rotor core; 211 - inner core; 212 - outer core; 2121 - core unit; 21211 - third end; 21212 - fourth end; 21213 - first limiting protrusion; 21214 - second limiting protrusion; 21215 - third limiting protrusion; 21216 - fourth limiting protrusion; 21217 - first injection molding groove; 213 - core lamination; 214 - mounting groove; 2121a - first core unit; 2121b - second core unit;

[0054] 220-Injection molding department;

[0055] 230 - permanent magnet; 231 - first wall; 232 - second wall; 233 - fifth wall; 234 - sixth wall; 235 - seventh wall; 236 - eighth wall; 230a - first permanent magnet; 230b - second permanent magnet;

[0056] 20-rotation axis;

[0057] X-first direction;

[0058] Y-second direction;

[0059] m-circumferential direction.

[0060] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0061] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0062] The AC loss and iron loss of the stator winding of the motor are different under heavy load and light load, which makes the efficiency of the motor different under heavy load and light load. In the related art, the motor either focuses on the efficiency under heavy load (the actual working load is greater than 80% of the rated load), so the efficiency is low under light load (the actual working load is less than 30% of the rated load); or focuses on the efficiency under light load, so the efficiency is low under heavy load. When the motor has both heavy load and light load conditions, no matter whether the motor design focuses more on heavy load conditions or light load conditions, its overall comprehensive efficiency when working under various conditions is not ideal, that is, when the motor design focuses more on heavy load conditions, due to its low efficiency under light load conditions, the overall comprehensive efficiency of the motor is poor; when the motor design focuses more on light load conditions, due to its low efficiency under heavy load conditions, the overall comprehensive efficiency of the motor is poor.

[0063] In summary, in order to make the overall comprehensive power of the motor better under heavy load conditions and light load conditions, it is necessary to balance the AC loss and iron loss of the stator winding of the motor under different working conditions. However, in the related art, the specific means to achieve the balance between the two are not clear. After demonstration and analysis, the applicant found that the ratio of the outer diameter of the motor's magnet to the outer diameter of the stator core is correlated with the overall comprehensive power of the motor. That is, the present application first provides an idea for balancing the AC loss and iron loss of the motor's stator winding, and under the guidance of this idea, provides a specific means to achieve the balance of the AC loss and iron loss of the motor's stator winding through experimental demonstration, thereby achieving a technical effect of better overall efficiency when the motor works under different working conditions.

[0064] 1 to 16 , some embodiments of the present application provide a motor 10 having a relatively good overall efficiency under heavy-load and light-load conditions. Specifically, the motor 10 includes a rotor assembly 200 and a stator assembly 100 .

[0065] 1 to 4 and 10 , the rotor assembly 200 is configured to rotate relative to the stator assembly 100 around the rotation axis 20 when the motor 10 is operating. The rotor assembly 200 includes a plurality of permanent magnets 230 distributed around the rotation axis 20. Specifically, each permanent magnet 230 is arranged in a circular array with the rotation axis 20 as the central axis, and along the circumferential direction m of the rotation axis 20, the intervals between each two adjacent permanent magnets 230 are equal. The specific number of permanent magnets 230 depends on actual needs, and can be six, eight, ten or twelve, etc. For ease of explanation, referring to FIG1 , the following example is given with ten permanent magnets 230.

[0066] The plurality of permanent magnets 230 include a first permanent magnet 230a and a second permanent magnet 230b. The first permanent magnet 230a and the second permanent magnet 230b are located on opposite sides of the rotation axis 20 along a first direction X, where the first direction X is perpendicular to the rotation axis 20. In other words, in some embodiments, referring to FIG. 4 and FIG. 5 , two of the ten permanent magnets 230 are named the first permanent magnet 230a and the second permanent magnet 230b, and the first permanent magnet 230a and the second permanent magnet 230b are located on opposite sides of the rotor assembly 200 in the radial direction. It should be noted that the "first permanent magnet 230a" and "second permanent magnet 230b" referred to in this application are any two permanent magnets 230 located on radially opposite sides of the rotor assembly 200. Therefore, in the embodiment shown in FIG5 , there are five pairs of permanent magnets 230, and the two permanent magnets 230 in each pair of permanent magnets 230 can be referred to as the "first permanent magnet 230a" and the "second permanent magnet 230b." In other embodiments, for example, when the rotor assembly 200 includes twelve permanent magnets 230, there are six pairs of "first permanent magnet 230a" and "second permanent magnet 230b." For ease of description, the following uses the "first permanent magnet 230a" and "second permanent magnet 230b" in one pair as an example.

[0067] 2 , 4 , and 5 , the first permanent magnet 230a has a first wall 231 facing away from the second permanent magnet 230b, and the second permanent magnet 230b has a second wall 232 facing away from the first permanent magnet 230a. The minimum distance between the first wall 231 and the second wall 232 is D1. In particular, the first wall 231 and the second wall 232 can both be planar walls and parallel to each other. In this case, the minimum distance between the first wall 231 and the second wall 232 is D1, which is the distance from any point on the first wall 231 to the second wall 232, or the distance from any point on the second wall 232 to the first wall 231. In other embodiments, the first wall 231 and the second wall 232 are both plane walls and there may be a small angle between them (the existence of the angle may be due to design requirements, or may be caused by processing errors or assembly errors); or the first wall 231 and the second wall 232 may also be arc surfaces. In this case, D1 is the minimum distance between the first wall 231 and the second wall 232 along the radial direction of the rotor assembly 200.

[0068] 5-8 , the rotor assembly 200 further includes a rotor core 210. The rotor core 210 defines a plurality of mounting slots 214 distributed along the circumferential direction m of the rotation axis 20. The number of mounting slots 214 is the same as the number of permanent magnets 230, and each permanent magnet 230 is disposed in a one-to-one correspondence within each mounting slot 214. In some embodiments, to facilitate injection molding and securing each permanent magnet 230, a first injection molding slot 21217 may be further provided on the side of the rotor core 210 facing the permanent magnet 230. The opening of the first injection molding slot 21217 communicates with the mounting slot 214 and faces the permanent magnet 230. After the rotor assembly 200 is injection molded, the injection molding material fills the first injection molding slot 21217 and the gap between the permanent magnet 230 and the rotor core 210, thereby further securing the positioning of the permanent magnet 230. The rotor core 210 may include an inner core 211 and an outer core 212. The outer core 212 includes a plurality of core units 2121 arranged around the rotation axis 20. A mounting slot 214 is defined between each adjacent core unit 2121. Each core unit 2121 is provided with a first injection molding slot 21217 on both sides of the circumferential direction m. This ensures that each permanent magnet 230 is provided with a first injection molding slot 21217 on both sides of the circumferential direction m, further enhancing the positioning stability of the permanent magnet 230. The related structures of the inner core 211 and outer core 212 of the rotor core 210 are described in detail below.

[0069] Referring to Figures 1-4 and 10 , the stator assembly 100 is arranged around the rotor assembly 200 and includes a stator core 110. Specifically, the stator core 110 includes a yoke 111 and a plurality of teeth 112. The yoke 111 is annular and arranged around the outside of the rotor assembly 200. Each tooth 112 is disposed between the yoke 111 and the rotor core 210 and is connected to the yoke 111. Each tooth 112 is distributed around the outside of the rotor assembly 200, with one end of each tooth 112 connected to the inner circumferential wall of the yoke 111 and the other end spaced apart from the rotor assembly 200. Specifically, the teeth 112 are arranged in a circular array with the rotation axis 20 as the central axis. Along the circumferential direction m of the rotation axis 20, the spacing between each adjacent tooth 112 is the same. The stator assembly 100 may also include a coil winding disposed around each tooth 112.

[0070] Referring to Figures 1 to 4 and Figure 10, the maximum outer diameter of the stator core 110 is D2. In some embodiments, the maximum outer diameter of the stator core 110 may be the maximum outer diameter of the outer peripheral wall of the yoke 111; in other embodiments, when the outer peripheral wall of the yoke 111 is also provided with other structures, for example, when the outer peripheral wall of the yoke 111 is also connected to the external teeth, the maximum outer diameter of the stator core 110 is the maximum outer diameter of the external teeth. In this embodiment, the maximum outer diameter of the stator is taken as an example to illustrate the maximum outer diameter of the yoke 111. When the outer peripheral wall of the stator core 110 is a regular circle, D2 is the diameter of the outer peripheral wall of the stator core 110. When the outer peripheral wall of the stator core 110 is an irregular ring, D2 is the maximum dimension of the outer peripheral wall of the stator core 110 in a direction perpendicular to the rotation axis 20. During actual measurement, a vernier caliper can be used to abut both sides of the stator core 110 in a direction perpendicular to the rotation axis 20, and the stator assembly 100 can be rotated relative to the vernier caliper with the rotation axis 20 as the center. At this time, the maximum degree displayed by the vernier caliper is the maximum outer diameter D2 of the stator core 110.

[0071] After demonstration, the size of the ratio of D1 / D2 is correlated with the distribution of the AC loss and iron loss of the stator winding of the motor 10. Specifically, when the ratio of D1 / D2 is small, the iron loss may account for a small proportion. When the ratio of D1 / D2 is large, the AC loss of the stator winding may account for a relatively small proportion. Only when D1 / D2 is within a certain range, the distribution of the AC loss and iron loss of the stator winding is optimal, and the efficiency of the motor 10 is also the highest at this time. When the AC loss and iron loss distribution of the stator winding of the motor 10 are both better, the overall working efficiency of the motor 10 is better under heavy load conditions and light load conditions. Referring to Figure 16, in this embodiment, by changing the ratio of D1 / D2, the working efficiency of the motor 10 under heavy load conditions and light load conditions is obtained respectively. After verification and analysis, when 0.5≤D1 / D2≤0.6, for example, D1 / D2 can be 0.5, 0.52, 0.54, 0.56, 0.58 or 0.6, etc. When 0.5≤D1 / D2≤0.6, the magnetic field distribution in the permanent magnet motor 10 can be optimized, so that the AC loss and iron loss of the stator winding of the motor 10 are minimized under various operating conditions. Therefore, when the motor 10 has both heavy-load and light-load operating conditions, the overall comprehensive efficiency of the motor 10 is better. Referring to Figure 16, when D1 / D2 is 0.53 to 0.55, the heavy-load efficiency of the motor 10 shows an upward trend, and the light-load efficiency of the motor 10 shows a downward trend; when D1 / D2 is 0.61 to 0.63, the heavy-load power of the motor 10 shows a slight downward trend, and the light-load power of the motor 10 shows a downward trend. In summary, the position with the best comprehensive power appears in the middle section between D1 / D2 of 0.53 and 0.63. After demonstration, when 0.5≤D1 / D2≤0.6, the comprehensive power of the motor 10 is better.

[0072] To further improve the overall power of the motor 10 , in some embodiments, 0.53≤D1 / D2≤0.57, for example, D1 / D2 may be 0.53, 0.54, 0.55, 0.56, or 0.57, etc. When 0.53≤D1 / D2≤0.57, the overall power of the motor 10 is better.

[0073] Referring to Figures 1 to 4 and Figure 10, in some embodiments, 40mm≤D1≤100mm, for example, D1 is 40mm, 50mm, 60mm, 70mm, 80mm, 90mm or 100mm, etc. When 40mm≤D1≤100mm, the ratio of D1 / D2 can be made more relevant to the overall efficiency of the motor 10, and while improving the overall efficiency of the motor 10, the expectation of improving the overall efficiency of the motor 10 is more accurate. Preferably, 60mm≤D1≤80mm. For example, D1 is 60mm, 65mm, 70mm, 75mm or 80mm, etc. When 60mm≤D1≤80mm, the ratio of D1 / D2 can be made more relevant to the overall efficiency of the motor 10, and while further improving the overall efficiency of the motor 10, the expectation of improving the overall efficiency of the motor 10 is more accurate.

[0074] In order to evenly distribute the iron loss of the motor 10 across the teeth 112 and the yoke 111 of the motor 10, the motor 10 is further optimized. Referring to FIG. 1-FIG . 5 and FIG. 10 , in some embodiments, the number of teeth 112 of the stator core 110 is N, where N ≥ 6. The number N of teeth 112 may be greater than the number of permanent magnets 230. Each tooth 112 has a third wall 1123 and a fourth wall 1124 that are arranged opposite to each other along the circumferential direction m of the rotation axis 20. The minimum distance Wt between the third wall 1123 and the fourth wall 1124 satisfies:

[0075] Specifically, the above formula is equivalent to:

[0076] Among them, let:

[0077] Therefore:

[0078] Among them, the size of T1 is equal to the theoretical maximum arrangement space of a single tooth portion 112 at the basic middle position along the radial direction of the stator assembly 100 in the circumferential direction m. That is, Wt is between T1 / 4 and 2T1 / 3 of the theoretical maximum arrangement space of the said middle position of the tooth portion 112. Specifically, Wt can be T1 / 4, T1 / 3, 5T1 / 12, T1 / 2, 7T1 / 12, or 2T1 / 3. This solution can evenly distribute the iron loss of the stator assembly 100 at the positions of the tooth portion 112 and the yoke portion 111 of the motor 10. It should be noted that when the sizes of multiple laminations of the tooth portion 112 along the direction parallel to the rotation axis 20 are different, Wt is the width size of the lamination with the smallest size along the circumferential direction m.

[0079] It should be noted that in this embodiment, the third wall 1123 and the fourth wall 1124 are both planar walls and are parallel to each other. In this case, Wt is the distance between two corresponding points at any position on the third wall 1123 and the fourth wall 1124. In other embodiments, the third wall 1123 and the fourth wall 1124 are both planar walls and have an angle between them (this angle may be due to design requirements or processing errors). In this case, Wt is the minimum distance between the third wall 1123 and the fourth wall 1124. In specific operation, the two measuring ends of a vernier caliper can be respectively abutted against the third wall 1123 and the fourth wall 1124, and the vernier caliper can be translated in the radial direction of the stator assembly 100. The minimum reading on the vernier caliper is the minimum distance Wt between the third wall 1123 and the fourth wall 1124. In another embodiment, the third wall 1123 and the fourth wall 1124 may also be other irregular shapes. The definition of Wt in this embodiment is the same as that in the above embodiment and will not be repeated here.

[0080] 1-5 and 10 , in some embodiments, the number of teeth 112 of the stator core 110 is N, where N ≥ 6. The number N of teeth 112 may be greater than the number of permanent magnets 230. The plurality of teeth 112 include a first tooth 112a and a second tooth 112b adjacently arranged along the circumferential direction m of the rotation axis 20. The first tooth 112a and the second tooth 112b are spaced apart, and the space (i.e., the tooth slot) therebetween is used to accommodate the coil winding. It should be noted that the first tooth 112a and the second tooth 112b are any two adjacent teeth 112 along the circumferential direction m among the teeth 112, and the difference in naming between the two is only for distinction. The first tooth portion 112a includes a first end portion 1121 facing away from the yoke portion 111 (the first end portion 1121 is the tooth shoe portion of the first tooth portion 112a), and the second tooth portion 112b includes a second end portion 1122 facing away from the yoke portion 111 (the second end portion 1122 is the tooth shoe portion of the second tooth portion 112b). Along the circumferential direction m, the first end portion 1121 and the second end portion 1122 are spaced apart, and the minimum spacing Wx between the first end portion 1121 and the second end portion 1122 satisfies:

[0081] Specifically, the above formula is equivalent to:

[0082] Among them, let:

[0083] Therefore:

[0084] The size of T2 is substantially equal to the maximum arrangement space along the sidewall of a single permanent magnet 230 facing away from the rotation axis 20 along the circumferential direction m. The minimum spacing Wx between the first end 1121 and the second end 1122 can be T2 / 10, 3T2 / 25, 7T2 / 50, 4T2 / 25, or T2 / 5, among others. The width between the tooth shoes of the stator core 110 significantly affects the iron loss of the tooth shoes and the sinusoidality of the air gap flux density, thus affecting the efficiency of the motor 10, as well as the cogging torque and torque ripple. Cogging torque is the torque generated by the interaction between the permanent magnet 230 and the core when the winding of the permanent magnet motor 10 is not energized. It is caused by fluctuations in the tangential component of the interaction force between the permanent magnet 230 and the armature teeth. When Wx ranges from T2 / 10 to T2 / 5, the distribution of the air gap flux density can be altered, reducing the cogging torque of the motor 10.

[0085] 1-5 and 10 , in some embodiments, the tooth portion 112 has a third wall surface 1123 on one side along the circumferential direction m of the rotation axis 20 and a fourth wall surface 1124 on the other side along the circumferential direction m. The third wall surface 1123 defines a first intersection line 1125 with the inner circumferential wall of the yoke 111. The intersection of the third wall surface 1123 and the inner circumferential wall of the yoke 111 may have a rounded chamfer or a straight chamfer. When the intersection of the third wall surface 1123 and the inner circumferential wall of the yoke 111 has a chamfer, the first intersection line 1125 is defined as the side edge of the chamfer away from the third wall surface 1123. In this embodiment, the maximum outer diameter of the outer peripheral wall of the yoke 111 is the maximum outer diameter of the stator core 110 (in other embodiments, the outer side of the yoke 111 may further be provided with external teeth, and the maximum outer diameter of the external teeth is the maximum outer diameter of the stator core 110). The minimum distance We between the first boundary line 1125 and the outer peripheral wall of the yoke 111 satisfies:

[0086] Specifically, the above formula is equivalent to:

[0087] Among them, let:

[0088] Therefore:

[0089] T3 is substantially equal to the maximum radial width of the stator core 110. The minimum distance We between the first boundary line 1125 and the outer peripheral wall of the yoke 111 can be T3 / 6, 2T3 / 9, 5T3 / 18, or T3 / 3. When We is within the range of T3 / 6 to T3 / 3, the distribution of AC loss and iron loss in the stator winding of the motor 10 can be optimized, thereby improving the overall efficiency of the motor 10.

[0090] Referring to Figures 1 to 5 and Figure 10, in some embodiments, the number of teeth 112 of the stator core 110 is N, and the number N of teeth 112 can be greater than the number of permanent magnets 230. The tooth 112 has a third wall 1123 and a fourth wall 1124 arranged relative to each other along the circumferential direction m of the rotation axis 20, and the minimum distance between the third wall 1123 and the fourth wall 1124 is Wt. The multiple teeth 112 include a first tooth 112a and a second tooth 112b arranged adjacent to each other along the circumferential direction m of the rotation axis 20. The first tooth 112a and the second tooth 112b are arranged at intervals, and the space between them (i.e., the tooth slot) is used to accommodate the coil winding. It should be noted that the first tooth 112a and the second tooth 112b are any two adjacent tooth portions 112 in each tooth portion 112, and the difference in naming between the two is only for distinction. The first tooth portion 112a includes a first end portion 1121 facing away from the yoke portion 111, and the second tooth portion 112b includes a second end portion 1122 facing away from the yoke portion 111. The first end portion 1121 is the tooth shoe position of the first tooth portion 112a, and the second end portion 1122 is the tooth shoe position of the second tooth portion 112b. Along the circumferential direction m, the first end portion 1121 and the second end portion 1122 are spaced apart, and the minimum spacing between the first end portion 1121 and the second end portion 1122 is Wx. The rotor assembly 200 also includes a rotor core 210 and a rotating shaft. The rotor core 210 includes an inner core 211 and an outer core 212. The inner core 211 is annular and arranged around the rotation axis 20. The rotating shaft passes through the inner core 211. The outer core 212 includes a plurality of core units 2121 distributed around the inner core 211. Along the circumferential direction m of the rotation axis 20, the core units 2121 and the permanent magnets 230 are alternately arranged one by one, i.e., each permanent magnet 230 is sandwiched between two adjacent core units 2121. The plurality of core units 2121 include a first core unit 2121a and a second core unit 2121b that are adjacent to each other along the circumferential direction m of the rotation axis 20 (i.e., for ease of description, the two adjacent core units 2121 along the circumferential direction m in each core unit 2121 are named the first core unit 2121a and the second core unit 2121b). The first core unit 2121a includes a third end 21211 facing away from the inner core 211, and the second core unit 2121b includes a fourth end 21212 facing away from the inner core 211. The third end 21211 and the fourth end 21212 are spaced apart, and the minimum spacing K between the third end 21211 and the fourth end 21212 satisfies the following: Wx ≤ K ≤ Wt. In this solution, the third end 21211 and the fourth end 21212 are spaced apart, thereby reducing magnetic flux leakage at this location.At the same time, when the minimum spacing K between the third end 21211 and the fourth end 21212 is too small, the motor 10 experiences significant magnetic flux leakage, reducing the air gap flux density and lowering the efficiency of the motor 10. When the minimum spacing K between the third end 21211 and the fourth end 21212 is too large, the limiting effect of each battery cell assembly on the permanent magnet 230 is reduced. Therefore, the minimum spacing K between the third end 21211 and the fourth end 21212 must be considered from three perspectives: magnetic flux leakage, increased armature current, and the anti-demagnetization capability of the motor 10. When Wx ≤ K ≤ Wt, the various effects of the motor 10 can be balanced.

[0091] It should be noted that in the above embodiment, the value of Wx can be arbitrarily selected based on actual needs and does not need to meet the range of T2 / 6 ≤ Wx ≤ T2 / 2 in the aforementioned embodiment. The value of Wt can also be arbitrarily selected based on actual needs and does not need to meet the range of T1 / 4 ≤ Wt ≤ 2T1 / 3 in the aforementioned embodiment. In a further embodiment, Wx ≤ K ≤ Wt; and T2 / 6 ≤ Wx ≤ T2 / 2; and T1 / 4 ≤ Wt ≤ 2T1 / 3. This solution can further improve the balance of various aspects of the motor 10.

[0092] 6-9 , in some embodiments, a first limiting protrusion 21213 is provided on a side of the third end 21211 proximate to the fourth end 21212, and a second limiting protrusion 21214 is provided on a side of the fourth end 21212 proximate to the third end 21211. The first limiting protrusion 21213 and the second limiting protrusion 21214 are spaced apart and arranged opposite each other along the circumferential direction m, and the minimum spacing between the first limiting protrusion 21213 and the second limiting protrusion 21214 is equal to the minimum spacing K between the third end 21211 and the fourth end 21212. The sidewall of the permanent magnet 230 disposed between the first core unit 2121a and the second core unit 2121b facing away from the rotation axis 20 abuts against the first limiting protrusion 21213 and the sidewall of the second limiting protrusion 21214 facing toward the rotation axis 20, respectively.

[0093] Referring to Figures 6-9, in some embodiments, a third limiting protrusion 21215 is further provided on the side of the end of the first core unit 2121a near the rotation axis 20 near the second core unit 2121b, and a fourth limiting protrusion 21216 is further provided on the side of the end of the second core unit 2121b near the rotation axis 20 near the first core unit 2121a. The third limiting protrusion 21215 and the fourth limiting protrusion 21216 are spaced apart and arranged opposite each other along the circumferential direction m. The wall surface of the permanent magnet 230 near the rotation axis 20 abuts against the third limiting protrusion 21215 and the wall surface of the fourth limiting protrusion 21216 facing away from the rotation axis 20, thereby limiting the displacement of the permanent magnet 230 toward the rotation axis 20.

[0094] Referring to Figures 6 and 10-12, in some embodiments, the outer core 212 is disconnected from the inner core 211, thereby reducing magnetic leakage. Furthermore, along the circumferential direction m, each core unit 2121 is disconnected from each other. This further reduces magnetic leakage. When the core units 2121 in the outer core 212 are disconnected from each other and the outer core 212 is disconnected from the inner core 211, to facilitate assembly, in some embodiments, the rotor assembly 200 further includes an injection molding portion 220, which fills the gap between the outer core 212 and the inner core 211 and connects the outer core 212 and the inner core 211. During the specific processing process, the outer core 212, the inner core 211, and the permanent magnet 230 can be first positioned in corresponding positions, and then the injection molding portion 220 can be injection molded so that the injection molding portion 220 at least fills the gap between the outer core 212 and the inner core 211, thereby connecting the outer core 212 and the inner core 211. In some embodiments, the injection molding portion 220 may further be connected to the permanent magnet 230 , so that the connection between the permanent magnet 230 and each outer core 212 is more stable.

[0095] In some embodiments, the outer peripheral wall of the outer iron core 212 can be arc-shaped and designed to be non-concentric with the axis of the rotating shaft. At the same time, the tooth boots of the tooth portion 112 are chamfered to make the air gap of the motor 10 uneven, thereby changing the distribution of the air gap magnetic density and reducing the cogging torque of the motor 10.

[0096] Referring to FIG. 12 , in some embodiments, the stator assembly 100 may also include an injection molded part separate from the injection molded portion 220 of the rotor assembly 200. A second injection molding groove 1111 may be provided on the outer periphery of the yoke 111 at a position opposite each tooth portion 112. Each second injection molding groove 1111 is used for injection molding after the stator assembly 100 is assembled, thereby improving the structural stability of the stator assembly 100. Specifically, the second injection molding groove 1111 may penetrate the stator assembly 100 along the second direction Y, and the cross-sectional area of ​​each second injection molding groove 1111 on the side closer to the rotation axis 20 is larger than the cross-sectional area on the side facing away from the rotation axis 20. This prevents the plastic injected into the second injection molding groove 1111 from easily separating from the stator core 110. Specifically, in some embodiments, the injection molding material connecting the stator assembly 100 and the injection molding material connecting the rotor assembly 200 may both be thermosetting plastics, specifically PBT plastics. In other embodiments, a fixing member, such as a screw or other component, may be passed through the second injection molding groove 1111 to fix the stator core.

[0097] In some embodiments, the stator core 110 includes a plurality of laminations 113 stacked in a direction parallel to the rotation axis 20 , and the laminations 113 satisfy one of the following conditions a)-d):

[0098] a) Referring to FIG13 , in some embodiments, the laminations 113 are configured to be integrally stamped from a first sheet, and multiple integrally formed laminations 113 are stacked in a direction parallel to the rotation axis 20 to form the stator core 110. In this solution, the laminations 113 can be processed more quickly.

[0099] b) Referring to FIG2 , in some embodiments, the laminations 113 are configured to be formed by splicing together a plurality of core monomers distributed along the circumferential direction m of the rotation axis 20, and the core monomers are configured to be integrally stamped from the second sheet, and the core monomers include at least one tooth portion 112. In this embodiment, each core monomer has the same shape, so twelve core monomers can be stamped, and the twelve core monomers are spliced ​​in a ring shape, and two adjacent core monomers are connected to form a single lamination 113, and multiple laminations 113 are stacked in a direction parallel to the rotation axis 20 to form the stator core 110. In this solution, stamping waste can be reduced and material costs can be reduced. In this embodiment, the core monomer includes one tooth portion 112, and in other embodiments, one core monomer may include multiple tooth portions 112, thereby reducing material costs while improving processing efficiency.

[0100] c) Referring to FIG. 14 , in some embodiments, the laminations 113 are formed by annularly bending a strip-shaped intermediate body along the circumferential direction m of the rotation axis 20 and connecting them end to end. The intermediate body is configured to be integrally stamped from a third sheet. This embodiment, on the one hand, reduces stamping waste compared to a method in which the laminations 113 are integrally stamped from a first sheet; on the other hand, it improves processing efficiency compared to a method in which the laminations 113 are formed by stamping individual cores and then splicing them together.

[0101] d) Referring to FIG. 13 , in some embodiments, the laminate 113 is provided with a stopper 1112 . The stopper 1112 forms a depression on one side wall of the laminate 113 along the second direction Y and a protrusion on the other side wall of the laminate 113 along the second direction Y. The second direction Y is parallel to the rotation axis 20. In this embodiment, when multiple laminates 113 are stacked in a direction parallel to the rotation axis 20, the protrusions of other laminates 113 on one side of a current laminate 113 extend into the depressions of the current laminate 113 , and the protrusions on the other side of the current laminate 113 extend into the depressions of other laminates 113 . This stabilizes the relative positions of the laminates 113 along the circumferential direction m, making relative movement of the laminates 113 less likely to occur along the circumferential direction m. The number of limiting portions 1112 depends on actual needs. In this embodiment, each core unit has three limiting portions 1112, wherein the yoke 111 portion of each lamination 113 unit has two limiting portions 1112, and the two limiting portions 1112 are respectively located at the two ends of the yoke 111 portion of each lamination 113 unit along the circumferential direction m. The tooth portion 112 portion of each lamination 113 unit has one limiting portion 1112. The specific structure of the limiting portion 1112 depends on actual needs. In this embodiment, the recess and protrusion formed by the limiting portion 1112 are both rectangular. In other embodiments, the rotor assembly 200 may also be provided with a limiting portion 1112, which will not be described here.

[0102] In some embodiments, the stator assembly 100 further includes a coil winding sleeved around each tooth portion 112, and the coil winding is a copper wire winding. The copper wire winding improves the overall performance of the motor 10. Alternatively, in other embodiments, the stator assembly 100 further includes a coil winding sleeved around each tooth portion 112, and the coil winding is an aluminum wire winding. Although the overall performance of the aluminum wire winding is not as good as that of the copper wire winding, when the aforementioned 0.5≤D1 / D2≤0.6, the performance of the motor 10 with the aluminum wire winding is more significantly improved compared to the related art.

[0103] 6-7 and 10-11 , in some embodiments, each core unit 2121 includes a plurality of core laminations 213 stacked along a second direction Y, parallel to the rotation axis 20. Along the second direction Y, the core laminations 213 have a minimum thickness dimension Ts. In other words, among the core laminations 213 , the core lamination 213 with the smallest wall thickness along the second direction Y has a wall thickness Ts. A mounting slot 214 is provided between each adjacent core unit 2121 . The core unit 2121 includes M permanent magnets 230 , specifically, ten permanent magnets 230 . Each permanent magnet 230 is disposed in a one-to-one correspondence in each mounting slot 214. The M permanent magnets 230 include a first permanent magnet 230a and a second permanent magnet 230b (the first permanent magnet 230a and the second permanent magnet 230b are any two permanent magnets 230 located on opposite sides of the rotation axis 20 along the first direction X). The first permanent magnet 230a and the second permanent magnet 230b are distributed on opposite sides of the rotation axis 20 along the first direction X, and the first direction X is perpendicular to the rotation axis 20. The first permanent magnet 230a includes a fifth wall 233 facing the second permanent magnet 230b, and the second permanent magnet 230b includes a sixth wall 234 facing the first permanent magnet 230a. The maximum spacing between the fifth wall 233 and the sixth wall 234 is D3, and the maximum spacing Wm between the two sides of the fifth wall 233 along the circumferential direction m satisfies:

[0104] The above formula is equivalent to:

[0105] Among them, let:

[0106] Therefore:

[0107] T4=Wm+X×Ts;

[0108] Wherein: 1≤X≤5. For example, X can be 1, 2, 3, 4 or 5, etc. T4 is basically equal to the theoretical upper limit size of the fifth wall 233. 1≤X≤5, that is, the maximum spacing Wm on both sides of the fifth wall 233 along the circumferential direction m is less than its theoretical maximum size minus one to five times the minimum wall thickness of the core lamination 213. In this solution, the leakage flux of the permanent magnet 230 at the two end support positions of the outer core 212 close to the rotating axis 20 is effectively limited, the power density of the motor 10 is improved, and the cost of the motor 10 is reduced. By constraining the width of one end of the permanent magnet 230 close to the rotating axis 20, the low-speed and light-load performance of the motor 10 and the anti-demagnetization strength of the permanent magnet 230 are improved, and the motor 10 achieves high efficiency and high reliability operation.

[0109] It should be noted that since the first permanent magnet 230a can be any one of the permanent magnets 230, in some embodiments, the maximum spacing between the walls of all permanent magnets 230 facing the rotation axis 20 along the circumferential direction m can be Wm. Furthermore, the first permanent magnet 230a includes a seventh wall 235 and an eighth wall 236 that are opposed to each other along the circumferential direction m. When the seventh wall 235 and the eighth wall 236 are both planar walls and arranged parallel to each other, the spacing between the seventh wall 235 and the eighth wall 236 is equal to the maximum spacing Wm between the fifth wall 233 along the circumferential direction m. When the seventh wall 235 and the eighth wall 236 are not parallel or both are not planar walls, the maximum spacing between the end of the seventh wall 235 near the rotation axis 20 and the end of the eighth wall 236 near the rotation axis 20 is equal to the maximum spacing Wm between the fifth wall 233 along the circumferential direction m. When there are chamfers between the fifth wall 233 and the seventh wall 235 and the eighth wall 236, the maximum distance between the side of the chamfer between the fifth wall 233 and the seventh wall 235 close to the seventh wall 235 and the side of the chamfer between the fifth wall 233 and the eighth wall 236 close to the eighth wall 236 is defined as Wm.

[0110] Referring to Figures 6-7 and 10-11, in some embodiments, the inner core 211 is annular and arranged around the rotation axis 20. The inner core 211 includes an inner circumferential wall proximal to the rotation axis 20 and an outer circumferential wall facing away from the rotation axis 20. Along the first direction X, the maximum distance Wr between the inner circumferential wall of the inner core 211 and the outer circumferential wall of the inner core 211 satisfies the following: Wr ≥ 2 × Ts. For example, Wr can be 2Ts, 2.2Ts, 2.4Ts, 2.6Ts, 2.8Ts, or 3Ts. In this embodiment, Wr is equal to the annular width of the inner core 211 along the first direction X. When Wr is too large, the gap between the inner core 211 and the outer core 212 is reduced, making injection molding difficult and reducing the stability of the connection between the inner core 211 and the outer core 212. When Wr is too small, the inner core 211 provides poor support for the rotating shaft. In this embodiment, when Wr≥2×Ts, on the one hand, the gap between the inner iron core 211 and the outer iron core 212 can be increased, thereby increasing the injection space and improving the connection stability between the inner iron core 211 and the outer iron core 212; on the other hand, the support stability for the rotating shaft can also be improved.

[0111] Referring to Figures 6-7 and 10-11, in some embodiments, the inner core 211 is annular and arranged around the rotation axis 20. The inner core 211 includes an inner peripheral wall close to the rotation axis 20 and an outer peripheral wall facing away from the rotation axis 20. Along the first direction X, the maximum distance Wr between the inner peripheral wall and the outer peripheral wall satisfies: Wr ≥ 2.5 mm. For example, Wr can be 2.5 mm, 2.7 mm, 3 mm, 3.2 mm, 3.5 mm, or 3.7 mm. In this solution, on the one hand, the gap between the inner core 211 and the outer core 212 can be increased, thereby increasing the injection molding space and improving the connection stability between the inner core 211 and the outer core 212; on the other hand, it can also improve the support stability of the rotating shaft. In further embodiments, Wr can also simultaneously satisfy Wr ≥ 2 × Ts.

[0112] Referring to Figures 6-7 and 10-11, in some embodiments, along the radial direction of the rotor assembly 200, the minimum distance Wa between each core unit 2121 and the inner core 211 satisfies the following: Wa ≥ 2 × Ts. For example, Wa can be 2Ts, 2.2Ts, 2.4Ts, 2.6Ts, 2.8Ts, or 3Ts. This solution can, on the one hand, increase the gap between the inner core 211 and the outer core 212, thereby increasing the injection molding space and improving the connection stability between the inner core 211 and the outer core 212; on the other hand, it can also improve the support stability of the rotating shaft.

[0113] Referring to Figures 6-7 and 10-11, in some embodiments, along the radial direction of the rotor assembly 200, the minimum distance Wa between each core unit 2121 and the inner core 211 satisfies: Wa ≥ 2.5 mm. For example, Wa can be 2.5 mm, 2.7 mm, 3 mm, 3.2 mm, 3.5 mm or 3.7 mm, etc. In this solution, on the one hand, the gap between the inner core 211 and the outer core 212 can be increased, thereby increasing the injection molding space and improving the connection stability between the inner core 211 and the outer core 212; on the other hand, it can also improve the support stability for the rotating shaft. In a further embodiment, Wa can also simultaneously satisfy Wa ≥ 2 × Ts.

[0114] Referring to Figures 1-3, 7-11 and 16, in a specific embodiment, when the D1 size is 74.8 mm (error ±0.1 mm), the D2 size is 136-142 mm, the Wt size is 9.95 mm (error ±0.1 mm), the We size is 7.3 mm (error ±0.1 mm), the Wx size is 3-4.2 mm, and the K size is 4.4 mm (error ±0.1 mm), the efficiency and cost ratio of the motor 10 is relatively good.

[0115] The second embodiment of the present application further provides an air supply assembly, comprising the motor 10 of any of the above embodiments. The air supply assembly is used to drive air toward a target direction, and can be used in electrical appliances such as electric fans, air conditioners, hair dryers, range hoods, and fresh air devices.

[0116] The third embodiment of the present application further provides an air treatment device, which includes the above-mentioned air supply assembly. The air treatment device can specifically be an electric fan, air conditioner, hair dryer, range hood, fresh air device or other electrical appliances.

[0117] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0118] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or", "and / or" or "and / or" appear in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0119] The above are only preferred embodiments of the present application and do not limit the patent scope of the present application. All equivalent structural transformations made using the contents of the present application description and drawings under the inventive concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A motor, comprising: A rotor assembly configured to rotate around a rotation axis, the rotor assembly comprising a plurality of permanent magnets distributed around the rotation axis, the plurality of permanent magnets comprising a first permanent magnet and a second permanent magnet, the first permanent magnet and the second permanent magnet being distributed on opposite sides of the rotation axis along a first direction, the first direction being perpendicular to the rotation axis, the first permanent magnet having a first wall facing away from the second permanent magnet, the second permanent magnet having a second wall facing away from the first permanent magnet, and a minimum distance between the first wall and the second wall being D1; as well as, A stator assembly, comprising a stator core, the stator core comprising a yoke and a plurality of teeth, the yoke is annular and arranged around the outer side of the rotor assembly, the teeth are distributed around the outer side of the rotor assembly, one end of each tooth is connected to the inner circumferential wall of the yoke, and the other end is spaced apart from the rotor assembly, and the maximum outer diameter of the stator core is D2; and Among them, 0.5≤D1 / D2≤0.

6.

2. The motor according to claim 1, wherein: 0.53≤D1 / D2≤0.

57.

3. The motor according to claim 1 or 2, wherein: 40mm≤D1≤100mm; or, 60mm≤D1≤80mm.

4. The motor according to any one of claims 1 to 3, wherein the number of the tooth portions is N, N ≥ 6, the tooth portion has a third wall surface and a fourth wall surface arranged opposite to each other along the circumferential direction of the rotation axis, and the minimum distance Wt between the third wall surface and the fourth wall surface satisfies:

5. The motor according to any one of claims 1 to 4, wherein the number of the tooth portions is N, N≥6, the plurality of tooth portions include a first tooth portion and a second tooth portion adjacently arranged along the circumferential direction of the rotation axis, the first tooth portion includes a first end portion facing away from the yoke portion, the second tooth portion includes a second end portion facing away from the yoke portion, along the circumferential direction, the first end portion is spaced from the second end portion, and a minimum spacing Wx between the first end portion and the second end portion satisfies:

6. The motor according to any one of claims 1 to 5, wherein the tooth portion has a third wall surface on one side along the circumferential direction of the rotation axis, the third wall surface and the inner peripheral wall have a first boundary line, the maximum outer diameter of the outer peripheral wall of the yoke portion is the maximum outer diameter of the stator core, and the minimum distance We between the first boundary line and the outer peripheral wall of the yoke portion satisfies:

7. The motor according to any one of claims 1 to 6, wherein: The tooth portion has a third wall surface and a fourth wall surface which are arranged opposite to each other along the circumferential direction of the rotation axis, and the minimum distance between the third wall surface and the fourth wall surface is Wt; The plurality of tooth portions include a first tooth portion and a second tooth portion which are adjacently arranged along the circumferential direction of the rotation axis, the first tooth portion includes a first end portion which faces away from the yoke portion, the second tooth portion includes a second end portion which faces away from the yoke portion, and along the circumferential direction, the first end portion and the second end portion are spaced apart from each other, and a minimum spacing between the first end portion and the second end portion is Wx; The rotor assembly further includes a rotor core and a rotating shaft, wherein the rotor core includes an inner core and an outer core, wherein the inner core is annular and arranged around the rotating axis, and the rotating shaft passes through the inner core; the outer core includes a plurality of core units distributed around the inner core, and along the circumference of the rotating axis, the core units and the permanent magnets are alternately arranged one by one; and The plurality of core units include a first core unit and a second core unit adjacent to each other in a circumferential direction of the rotation axis, The first core unit includes a third end away from the inner core, the second core unit includes a fourth end away from the inner core, the third end and the fourth end are arranged at intervals, and the minimum spacing K between the third end and the fourth end satisfies: Wx≤K≤Wt.

8. The electric machine according to claim 7, wherein: Along the circumferential direction, the core units are disconnected from each other, and the ends of the core units close to the inner core are disconnected from the inner core.

9. The electric machine according to claim 8, wherein: The rotor assembly further includes an injection molding part, which fills a gap between the outer iron core and the inner iron core and connects the outer iron core and the inner iron core.

10. The electric machine according to any one of claims 1 to 9, wherein: The stator core includes a plurality of laminations stacked in a direction parallel to the rotation axis, and the laminations satisfy one of the following conditions a)-d): a) the stack is configured to be integrally stamped from the first sheet; b) the lamination is configured to be formed by splicing a plurality of core monomers distributed in the circumferential direction of the rotation axis, the core monomer is configured to be integrally stamped by the second sheet, and the core monomer includes at least one tooth portion; c) the laminations are configured to be formed by an intermediate body in a strip shape being annularly bent along the circumference of the rotation axis and connected end to end, and the intermediate body is configured to be integrally stamped by a third sheet body; d) The stack is provided with a limiting portion, the limiting portion forms a depression on one side wall of the stack along the second direction and forms a protrusion on the other side wall of the stack along the second direction, and the second direction is parallel to the rotation axis.

11. The electric machine according to any one of claims 1 to 10, wherein: The stator assembly further comprises a coil winding sleeved on each of the teeth, wherein the coil winding is a copper wire winding; or; The stator assembly further comprises a coil winding sleeved on each of the teeth, and the coil winding is an aluminum wire winding.

12. An air supply assembly, comprising the motor according to any one of claims 1-11.

13. An air handling device, comprising the air supply assembly according to claim 12.

Images