Motor and scrubber

Abstract

The invention provides a motor and a scrubber. The motor comprises a motor rotating shaft, a stator assembly, a rotor, a movable impeller, a fixed impeller set and a stator shell. The movable impeller and the rotor are sequentially and fixedly arranged on the motor rotating shaft at intervals in the first direction parallel to the axial direction of the motor rotating shaft, and the stator assembly is configured to surround the rotor; the fixed impeller group sleeves the motor rotating shaft at intervals and is positioned between the movable impeller and the rotor; the stator assembly and the fixed impeller set are arranged on the stator shell. The orthographic projection of the fixed impeller group on a first reference plane is partially overlapped with the orthographic projection of the stator shell on the first reference plane; the first reference plane is a plane parallel to the first direction. According to the motor, the orthographic projection of the fixed impeller set and the orthographic projection of the stator shell on the first reference plane are partially overlapped, and the first reference plane is the plane parallel to the first direction, so that the axial size of the motor in the first direction is reduced, and the miniaturization design of the motor is facilitated.

Description

Technical Field

[0001] This application relates to the field of motor technology, specifically to a motor and a floor scrubber. Background Technology

[0002] As the core power component of various electromechanical equipment, electric motors are widely used in many fields such as floor scrubbers, sweepers, household appliances, and industrial machinery. In the structural design of electric motors, unreasonable structural design results in a large axial dimension, which is detrimental to motor miniaturization. Summary of the Invention

[0003] In view of this, the embodiments of this application aim to provide a motor and a floor scrubber to solve the problem of reducing the axial dimension of the motor to a certain extent and realizing the miniaturization of the motor in the prior art.

[0004] This application provides an electric motor, comprising: The motor shaft, stator assembly, rotor, and impeller are provided, wherein the impeller and the rotor are sequentially fixed to the motor shaft at intervals along a first direction parallel to the axial direction of the motor shaft, and the stator assembly is configured to surround the rotor. A fixed impeller assembly is spaced and sleeved on the motor shaft, and is located between the moving impeller and the rotor; The stator housing, wherein the stator impeller assembly is disposed outside the stator housing; Wherein, the orthographic projection of the stator impeller assembly on the first reference plane partially overlaps with the orthographic projection of the stator housing on the first reference plane; The first reference plane is a plane that is parallel to the first direction.

[0005] Compared to the structural layout in related technologies where the stator impeller and stator housing are arranged adjacent to each other along the axial direction of the motor, in this application, the stator impeller assembly and stator housing are designed to overlap in their orthogonal projections on a first reference plane, and the first reference plane is a plane that is parallel to the first direction (that is, parallel to the axial direction of the motor shaft), so as to reduce the axial dimension of the motor along the first direction, thereby facilitating the miniaturization design of the motor.

[0006] In one embodiment, the fixed impeller assembly includes a first fixed impeller and a second fixed impeller respectively spaced apart and sleeved on the motor shaft, with the first fixed impeller located between the moving impeller and the second fixed impeller; The orthographic projection of the first stator impeller onto the first reference plane partially overlaps with the orthographic projection of the stator housing onto the first reference plane; and / or, The orthographic projection of the second stator impeller on the first reference plane partially overlaps with the orthographic projection of the stator housing on the first reference plane.

[0007] In one embodiment, the stator housing has at least one first mounting hole at its first end facing the moving impeller, and the first stator impeller has a second mounting hole corresponding to the at least one first mounting hole; and / or The outer peripheral surface of the first end is provided with at least one first mounting part, and the inner peripheral surface of the second fixed impeller is provided with a second mounting part corresponding to the at least one first mounting part; The first mounting hole and the first mounting part are arranged alternately around the motor shaft.

[0008] In one embodiment, the first stator impeller is provided with an annular mounting groove, and the stator housing is provided with an annular protrusion that mates with the annular mounting groove; and / or, The second fixed impeller is constructed as a hollow structure, and the stator housing is partially housed inside the second fixed impeller at one end facing the moving impeller.

[0009] In one embodiment, the portion of the stator housing facing the impeller is located inside the stator-impeller assembly.

[0010] In one embodiment, the stator housing is located at one end facing the moving impeller, inside the first and / or the second stator impeller.

[0011] In one embodiment, the first fixed impeller and the motor shaft are provided with a first micro-gap along the radial direction of the motor shaft, and the ratio of the diameter of the central hole of the first fixed impeller to the diameter of the motor shaft is in the range of 1.05-1.2; and / or, The stator housing and the motor shaft are provided with a second micro gap along the radial direction of the motor shaft, and the ratio of the diameter of the central hole of the stator housing to the diameter of the motor shaft is in the range of 1.01-1.05.

[0012] In one embodiment, the motor further includes a first seal disposed between the first stator impeller and the stator housing.

[0013] In one embodiment, the motor further includes a wear-resistant component sandwiched between the first seal and the stator housing, the wear-resistant component being sleeved on the motor shaft and configured to have an interference fit with the motor shaft.

[0014] In one embodiment, the motor further includes a first bearing, which is sleeved on the motor shaft and housed within the stator housing. The outer ring of the first bearing is configured to be interference-fitted with the stator housing, and the inner ring of the first bearing is configured to be interference-fitted with the motor shaft.

[0015] In one embodiment, the motor further includes a control circuit module, which includes a circuit board and specific electronic components, the circuit board being located at the end of the stator housing away from the impeller; The stator housing includes a heat dissipation inclined shell, which forms a receiving cavity. At least a portion of the rotor, at least a portion of the stator assembly, and at least a portion of the specific electronic components are located within the receiving cavity. The receiving cavity of the heat dissipation inclined shell gradually expands along the direction from the first stator impeller toward the circuit board. The moving impeller, the first fixed impeller, and the stator housing together define a heat dissipation channel, and the airflow flowing out of the heat dissipation channel diffuses along the extension direction of the heat dissipation inclined shell.

[0016] In one embodiment, the stator housing includes a cover plate that covers the receiving cavity, the circuit board is fixed to the side of the cover plate away from the receiving cavity, and the specific electronic component is fixed to the side of the circuit board facing the cover plate and extends through the cover plate into the receiving cavity.

[0017] In one embodiment, the outermost contour of the orthographic projection of the heat dissipation slope housing onto the second reference plane coincides with the outermost contour of the orthographic projection of the stator housing onto the second reference plane; or, the outermost contour of the orthographic projection of the heat dissipation slope housing onto the second reference plane is located within the outermost contour of the orthographic projection of the stator housing onto the second reference plane. The first direction is the direction parallel to the axial direction of the motor shaft, and the second reference plane is a plane perpendicular to the first direction.

[0018] This application also provides a floor scrubbing machine, including the motor described in the above embodiments, the motor being used to provide driving force for the floor scrubbing machine. Attached Figure Description

[0019] Figure 1 The image shown is a top view of a motor provided in an embodiment of this application.

[0020] Figure 2 The image shown is an embodiment provided by this application. Figure 1 The corresponding AA section view.

[0021] Figure 3 The image shown is an embodiment provided by this application. Figure 1 The corresponding BB section view.

[0022] Figure 4 The image shown is an isometric view of a motor provided in an embodiment of this application.

[0023] Figure 5The image shown is an exploded view of a motor provided in an embodiment of this application.

[0024] Figure 6 The image shown is an embodiment provided by this application. Figure 3 The corresponding enlarged view at point C.

[0025] Figure 7 The image shown is an embodiment provided by this application. Figure 1 The corresponding DD section view.

[0026] Figure label: 100. Motor; 11. Motor shaft; 12. Rotor; 13. Stator assembly; 131. Iron core; 1311. Tooth; 1312. Yoke; 132. Coil; 133. Support structure; 1331. First support part; 1331a. First limiting part; 1332. Cover part; 1332 a. Second limiting part; 1333. Cover; 1334. Support member; 1334a. Second support part; 1334b. Third support part; 14. Moving impeller; 141. Impeller top cover; 142. Impeller mounting seat; 143. Moving blade; 1431. Third leading edge; 1432. Third trailing edge; 15. Impeller cover; 151. Air inlet; 16. Fixed impeller assembly; 161. First fixed impeller; 1611. First impeller seat; 1611a. Annular mounting groove; 1612. First blade; 1612a. First leading edge; 1612b. First trailing edge; 1613. Second mounting hole; 1614. Opening groove; 162. Second fixed impeller; 1621. Second impeller seat; 1622, Second blade; 1622a, Second leading edge; 1622b, Second trailing edge; 1623, Second mounting part; 17, Stator housing; 171, Annular protrusion; 172, Cover plate; 173, Heat dissipation inclined shell; 1731, Receiving cavity; 174, First mounting hole; 175, First mounting part; 18, Control circuit module; 181, Circuit board; 182, Specific electronic component; 19, Mounting part; 20, First seal; 201, Annular receiving part; 21, Wear-resistant part; 22, First bearing; 23, Bearing assembly; 231, Second bearing; 232, Bearing seat; 24, Positioning part; 25, Base; 26, Second seal; Z, First direction. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] As the core power component of various electromechanical equipment, electric motors are widely used in many fields such as floor scrubbers, sweepers, household appliances, and industrial machinery. In the structural design of electric motors, the moving impeller, one or more fixed impellers, and the stator housing pass through the motor shaft through their respective central holes and are arranged adjacent to each other along the motor's axial direction. Due to the unreasonable design of this motor structure, the axial dimension of the motor is relatively large, which is not conducive to the miniaturization of the motor.

[0029] See Figures 2 to 5 One embodiment of this application provides a motor 100, including a motor shaft 11, a stator assembly 13, a rotor 12, a moving impeller 14, a stator impeller assembly 16, and a stator housing 17. The moving impeller 14 and the rotor 12 are sequentially fixed to the motor shaft 11 at intervals along a first direction Z parallel to the axial direction of the motor shaft 11. The stator assembly 13 is configured to surround the rotor 12. The stator impeller assembly 16 is spaced and sleeved on the motor shaft 11, and located between the moving impeller 14 and the rotor 12. The stator impeller assembly 16 is disposed outside the stator housing 17. The orthographic projection of the stator impeller assembly 16 on a first reference plane partially overlaps with the orthographic projection of the stator housing 17 on the first reference plane. The first reference plane is a plane parallel to the first direction Z.

[0030] Compared to the structural layout in related technologies where the stator impeller and stator housing 17 are sequentially adjacent along the axial direction of the motor 100, in this application, the stator impeller assembly 16 and stator housing 17 are designed to overlap in their orthogonal projections on a first reference plane, and the first reference plane is a plane parallel to the first direction Z (that is, parallel to the axial direction of the motor shaft 11), so as to reduce the axial dimension of the motor 100 along the first direction Z, thereby facilitating the miniaturization design of the motor 100.

[0031] See Figure 2 , Figure 3 and Figure 5 In one embodiment, the impeller assembly 16 includes a first impeller 161 and a second impeller 162 respectively spaced apart from the motor shaft 11, with the first impeller 161 located between the moving impeller 14 and the second impeller 162; the orthographic projection of the first impeller 161 on the first reference plane partially overlaps with the orthographic projection of the stator housing 17 on the first reference plane; and / or, the orthographic projection of the second impeller 162 on the first reference plane partially overlaps with the orthographic projection of the stator housing 17 on the first reference plane.

[0032] It is understandable that, in order to reduce the axial dimension of the motor 100, the first stator impeller 161 may overlap with the orthographic projection of the stator housing 17 on the first reference plane; the second stator impeller 162 may overlap with the orthographic projection of the stator housing 17 on the first reference plane; the first stator impeller 161 and the second stator impeller 162 may each overlap with the orthographic projection of the stator housing 17 on the first reference plane; or both the first stator impeller 161 and the second stator impeller 162 may overlap with the orthographic projection of the stator housing 17 on the first reference plane, and simultaneously, the first stator impeller 161 and the second stator impeller 162 may each overlap with the orthographic projection of the stator housing 17 on the first reference plane. The orthographic projections of the first stator impeller 161 and the second stator impeller 162 on the first reference plane may partially overlap or not overlap at all.

[0033] In one embodiment of this application, in order to minimize the axial dimension of the motor 100 while meeting the usage requirements, the first stator impeller 161, the second stator impeller 162 and the stator housing 17 have overlapping orthographic projections on the first reference plane, and the first stator impeller 161 and the second stator impeller 162 overlap with the orthographic projections of the stator housing 17 on the first reference plane.

[0034] By designing at least one of the first stator impeller 161 and the second stator impeller 162 to overlap with the orthographic projection portion of the stator housing 17 on the first reference plane, the radial dimension of the motor 100 in the first direction Z is reduced, thereby achieving a miniaturized design of the motor 100.

[0035] See Figure 5 and Figure 7 and combined Figure 2 and Figure 3 In one embodiment, the stator housing 17 has at least one first mounting hole 174 at its first end facing the moving impeller 14, and the first stator impeller 161 has a second mounting hole 1613 corresponding to the at least one first mounting hole 174; and / or, the outer peripheral surface of the first end has at least one first mounting portion 175, and the inner peripheral surface of the second stator impeller 162 has a second mounting portion 1623 corresponding to the at least one first mounting portion 175; wherein the first mounting hole 174 and the first mounting portion 175 are arranged alternately around the motor shaft 11.

[0036] The first impeller 161 and the first end of the stator housing 17 can be stably connected by fasteners such as screws passing through the second mounting hole 1613 and the first mounting hole 174. The second mounting part 1623 extends toward the motor shaft 11. The first mounting part 175 can be a mounting groove. The second mounting part 1623 extends into the mounting groove and abuts against the bottom wall of the mounting groove to assemble the second impeller 162 onto the stator housing 17.

[0037] Because the stator housing 17 and the first stator impeller 161 are connected through the first mounting hole 174 and the second mounting hole 1613, the connection is highly stable, and the stator housing 17 and the first stator impeller 161 are tightly fitted to each other on the side facing each other. The central hole diameter for mates between the first stator impeller 161 and the motor shaft 11 is designed to be small, which improves the sealing performance of the motor 100 along the first direction Z. In addition, the second stator impeller 162 extends into the first mounting part 175 through the second mounting part 1623 to assemble the second stator impeller 162 onto the stator housing 17, so that the second stator impeller 162 and the orthographic projection of the stator housing 17 on the first reference plane overlap, thereby saving installation space along the first direction Z and further reducing the axial size of the motor 100.

[0038] Continue reading Figure 5 In one embodiment of this application, the first end is provided with three first mounting holes 174 at even intervals around the axis of the motor shaft 11, and three first mounting parts 175 are provided at even intervals. The three first mounting holes 174 and the three first mounting parts 175 are staggered. The first fixed impeller 161 is provided with three second mounting holes 1613 corresponding to the three first mounting holes 174, and the second fixed impeller 162 is provided with three second mounting parts 1623 corresponding to the three first mounting parts 175.

[0039] It is understood that the number of the first mounting hole 174, the second mounting hole 1613, the first mounting part 175, and the second mounting part 1623 can be set as needed, and is not limited to the three in this embodiment. In addition, the first impeller 161 and the stator housing 17 can also be connected by snap-fit ​​or other means. In this embodiment, the connection by fasteners and mounting holes improves the stability of the connection and the sealing of the motor 100, so that the motor 100 can be used in scenarios such as floor scrubbers that operate in humid environments for a long time.

[0040] See Figure 2 , Figure 3 and Figure 5In one embodiment, the first fixed impeller 161 is provided with an annular mounting groove 1611a, and the stator housing 17 is provided with an annular protrusion 171 that mates with the annular mounting groove 1611a; and / or, the second fixed impeller 162 is constructed as a hollow structure, and the stator housing 17 is partially housed inside the second fixed impeller 162 at one end facing the moving impeller 14.

[0041] Thus, by providing a matching annular mounting groove 1611a and annular protrusion 171, the first stator impeller 161 and the stator housing 17 are partially overlapped on the first reference plane, thereby saving installation space along the first direction Z and reducing the axial dimension of the motor 100. By constructing the second stator impeller 162 as a hollow structure, so that at least one end of the stator housing 17 is located inside the second stator impeller 162, the installation space along the first direction Z is further saved, thereby further reducing the axial dimension of the motor 100.

[0042] See Figure 2 and Figure 3 In one embodiment, the stator housing 17 has one end portion facing the moving impeller 14 located inside the stator impeller assembly 16. It is understood that the first end of the stator housing 17 may be partially located inside the first stator impeller 161; or the first end may be partially located inside the second stator impeller 162; or the first end may be partially located inside both the first and second stator impellers; or the first end may be located inside both the first and second stator impellers, and partially inside both the first and / or second stator impellers.

[0043] This saves installation space along the first direction Z, thereby reducing the axial dimension of the motor 100.

[0044] See Figure 2 and Figure 3 In one embodiment, the stator housing 17 is located at one end facing the moving impeller 14, inside the first stator impeller 161 and / or the second stator impeller 162. This saves mounting space along the axial direction of the motor shaft 11, thereby reducing the axial dimension of the motor 100 and facilitating miniaturization of the motor 100.

[0045] See Figure 2 , Figure 3 and Figure 5Specifically, in one embodiment, the first fixed impeller 161 includes a first impeller seat 1611 and a plurality of first blades 1612 evenly distributed on the first impeller seat 1611. The first blades 1612 have a first leading edge 1612a and a first trailing edge 1612b. The direction of the first leading edge 1612a pointing to the first trailing edge 1612b forms a first angle with the first direction Z. The second fixed impeller 162 includes a second impeller seat 1621 and a plurality of second blades 1622 evenly distributed on the second impeller seat 1621. The second blades 1622 have a second leading edge 1622a and a second trailing edge 1622b. The direction of the second leading edge 1622a pointing to the second trailing edge 1622b forms a second angle with the first direction Z. The moving impeller 14 includes a plurality of moving blades 143. The moving blades 143 have a third leading edge (not shown) and a third trailing edge (not shown). The direction of the third leading edge pointing to the third trailing edge forms a third angle with the first direction Z. Optionally, the first blade 1612 has 11 blades, and the second blade 1622 has 12 blades.

[0046] Wherein, the second included angle is greater than the first included angle, and the first included angle is greater than the third included angle; the first leading edge 1612a and the first trailing edge 1612b are respectively the starting point for airflow inflow and the ending point for airflow outflow on the working surface of the first blade 1612; the second leading edge 1622a and the second trailing edge 1622b are respectively the starting point for airflow inflow and the ending point for airflow outflow on the working surface of the second blade 1622; the third leading edge and the third trailing edge are respectively the starting point for airflow inflow and the ending point for airflow outflow on the working surface of the moving blade 143.

[0047] It is understandable that the first fixed impeller 161 and the second fixed impeller 162 will not rotate with the motor shaft 11. That is, the first fixed impeller 161 and the second fixed impeller 162 are spaced apart from the motor shaft 11, and the distance between the first fixed impeller 161 and the second fixed impeller 162 and the motor shaft 11 needs to ensure that the motor shaft 11 will not come into contact with or collide with the first fixed impeller 161 and the second fixed impeller 162 during the rotation of the motor shaft 11.

[0048] In this application, the second included angle is greater than the first included angle, and the first included angle is greater than the third included angle. That is, the tilt angle of the moving blade 143, the first blade 1612, and the second blade 1622 relative to the first direction Z gradually increases, so as to play a gradual guiding role for the airflow. This allows the airflow formed by the air to flow into the air inlet 151 and then flow downward along the heat dissipation channel formed by the gradual change of the tilt angle of the moving blade 143, the first blade 1612, and the second blade 1622. Moreover, the gradual increase of the tilt angle can make the airflow transition smoothly, reduce the noise generated by the impact of the airflow and the blades, and help improve the smoothness and efficiency of the airflow. If the tilt angle of the blades relative to the first direction Z is set to be large, the direction of airflow movement will suddenly make a large turn, resulting in a significant increase in noise, and will also affect the smoothness and efficiency of the airflow.

[0049] See Figure 2 , Figure 3 and Figure 5 In one embodiment, the first stator impeller 161 and the motor shaft 11 are provided with a first micro-gap along the radial direction of the motor shaft 11, and the ratio of the diameter of the central hole of the first stator impeller 161 to the diameter of the motor shaft 11 is in the range of 1.05-1.2; and / or, the stator housing 17 and the motor shaft 11 are provided with a second micro-gap along the radial direction of the motor shaft 11, and the ratio of the diameter of the central hole of the stator housing 17 to the diameter of the motor shaft 11 is in the range of 1.01-1.05. The first stator impeller 161 is disposed on the stator housing 17.

[0050] In one specific embodiment, the diameter of the motor shaft 11 is 20mm, the diameter of the central hole of the first stator impeller 161 is 22mm, and the diameter of the central hole of the stator housing 17 is 21mm.

[0051] Thus, in this application, by setting a first micro-gap in the radial direction between the first stator impeller 161 and the motor shaft 11, and setting a second micro-gap in the radial direction between the stator housing 17 and the motor shaft 11, the radial gap between the first stator impeller 161 and the motor shaft 11 is very small, and the radial gap between the stator housing 17 and the motor shaft 11 is also very small. By setting these two micro-gap layers, liquid water or water vapor can be reduced from entering the stator housing 17 from the assembly gap of the motor 100 to a certain extent, thereby improving the waterproof performance of the motor 100.

[0052] See Figure 2 , Figure 3 , Figure 5 and Figure 6In one embodiment, the motor 100 further includes a first seal 20, which is sandwiched between the first stator impeller 161 and the stator housing 17. The first seal 20 is located inside the annular protrusion 171 and is used to seal the gap between the first stator impeller 161 and the stator housing 17 along the first direction Z.

[0053] In this application, the first seal 20 at least partially abuts against the top wall of the annular mounting groove and the side of the stator housing 17 facing the first stator impeller 161 on its opposite sides along the first direction Z, so that the first seal 20 can seal the gap between the first stator impeller 161 and the stator housing 17 in the first direction Z. Furthermore, the first seal is generally annular in shape so that it can seal the circumferential gap between the first stator impeller and the stator housing along the motor shaft. Optionally, the material of the first seal may be, but is not limited to, rubber.

[0054] It is understandable that the size of the annular mounting groove can be designed to be larger than the size of the annular protrusion in order to install the first seal 20. Moreover, since the first stator impeller 161 and the motor shaft 11 are spaced apart, in one embodiment of this application, the side portion of the first stator impeller 161 facing the stator housing 17 is pressed onto the stator housing 17 to support the first stator impeller 161 in the first direction Z.

[0055] Thus, by setting the first sealing element 20, and sandwiching the first sealing element 20 between the first stator impeller 161 and the stator housing 17, the first sealing element 20 can seal the gap between the first stator impeller 161 and the stator housing 17 along the circumferential direction of the motor shaft 11, thereby further improving the waterproof performance of the motor 100.

[0056] See Figure 2 , Figure 3 , Figure 5 and Figure 6 In one embodiment, the motor 100 further includes a wear-resistant member 21 sandwiched between the first seal 20 and the stator housing 17. The wear-resistant member 21 is sleeved on the motor shaft 11 and configured to have an interference fit with the motor shaft 11. Optionally, the wear-resistant member 21 may be, but is not limited to, a Teflon wear-resistant sheet.

[0057] Because the wear-resistant part 21 is interference-fitted with the motor shaft 11 in the radial direction of the motor shaft 11, the wear-resistant part 21 remains in contact with the motor shaft 11 during the rotation of the motor shaft 11, thereby reducing the wear of the motor shaft 11 and protecting the motor shaft 11. In addition, by providing the wear-resistant part 21, it can also be used to seal the axial clearance of the motor shaft 11, thereby improving the waterproof performance of the motor 100.

[0058] See Figure 2 , Figure 3 and Figure 5 Specifically, in one embodiment, the diameter of the central hole of the wear-resistant component 21 is smaller than the diameter of the motor shaft 11. Further, in one embodiment, the difference between the diameter of the central hole of the wear-resistant component 21 and the diameter of the motor shaft 11 is greater than 0.1 mm, so that the wear-resistant component 21 remains in contact with the motor shaft 11 during rotation, preventing separation of the wear-resistant component 21 from the motor shaft 11 due to shaking during rotation.

[0059] See Figure 2 , Figure 3 , Figure 5 and Figure 6 In one embodiment, the motor 100 further includes a first bearing 22, which is sleeved on the motor shaft 11 and housed within the stator housing 17. The outer ring of the first bearing 22 is configured to be interference-fitted with the stator housing 17, and the inner ring of the first bearing 22 is configured to be interference-fitted with the motor shaft 11.

[0060] Thus, by placing the first bearing 22 inside the stator housing 17, rather than placing it inside the first stator impeller 161 or the stator housing 17 for fitting into the corresponding central hole of the motor shaft 11, the diameter of the corresponding central hole of the first stator impeller 161 and the stator housing 17 can be designed to be smaller. This can reduce the radial dimension of the end of the motor 100 where the first stator impeller 161 is located to a certain extent, thereby facilitating the miniaturization of the motor 100. Moreover, since the diameter of the corresponding central hole of the first stator impeller 161 and the stator housing 17 is designed to be smaller, it is more difficult for liquid water or water vapor to enter the stator housing 17, thereby improving the waterproof performance of the motor 100 to a certain extent.

[0061] See Figure 2 , Figure 3 , Figure 5 and Figure 7In one embodiment, the motor 100 further includes a control circuit module 18, which includes a circuit board 181 and specific electronic components 182. The circuit board 181 is located at the end of the stator housing 17 away from the moving impeller 14. The stator housing 17 includes a heat dissipation inclined shell 173, which forms a receiving cavity 1731. At least a portion of the rotor 12, at least a portion of the stator assembly 13, and at least a portion of the specific electronic components 182 are located within the receiving cavity 1731. The receiving cavity 1731 of the heat dissipation inclined shell 173 gradually expands along the direction from the first stator impeller 161 toward the circuit board 181. The moving impeller 14, the first stator impeller 161, and the stator housing 17 together define a heat dissipation channel, and the airflow flowing out of the heat dissipation channel diffuses along the extending direction of the heat dissipation inclined shell 173. See also... Figure 2 and Figure 3 The direction indicated by the bold arrow in the diagram is the direction of airflow.

[0062] Optionally, the heat dissipation inclined housing 173 is made of a thermally conductive material and is a thermally conductive metal part, so that the hot airflow in the receiving cavity 1731 can transfer heat to the heat dissipation inclined housing 173, thereby improving the heat dissipation efficiency of the motor 100.

[0063] In this application, on the one hand, since the receiving cavity 1731 of the heat dissipation inclined housing 173 gradually expands along the direction of the fixed impeller toward the circuit board 181, that is, the outer peripheral surface of the heat dissipation inclined housing 173 is designed as a smoothly transitioning expansion inclined structure, and the radial dimension of the outer peripheral surface gradually increases, the heat dissipation inclined housing 173 can effectively avoid the hot airflow from the heat dissipation channel from flowing along its extension direction and spreading into the air during the process of guiding the hot airflow from the heat dissipation channel to flow and diffuse into the air, thus avoiding the noise generated by the hot airflow due to the obstruction of the boss during the flow, thereby reducing the noise of the motor 100 to a certain extent and improving the comfort of using the household equipment. On the other hand, since the stator assembly 13 and at least some of the specific electronic components 182 are located within the receiving cavity 1731, that is, the length of the heat dissipation inclined housing 173 along the first direction Z is relatively long, the path length of the hot airflow can be extended, thereby improving the heat dissipation efficiency and heat dissipation performance of the motor 100 to a certain extent. Furthermore, since at least some of the specific electronic components 182 are located within the receiving cavity 1731, the length of the other end of the stator housing 17 connecting the circuit board 181 along the first direction Z is reduced, which is conducive to the rapid diffusion of hot airflow into the air, thereby improving the heat dissipation efficiency of the motor 100 to a certain extent.

[0064] See Figure 4 In one embodiment, the heat dissipation inclined housing 173 is configured as a frustum.

[0065] Since the outer peripheral surface of the heat dissipation inclined shell 173 is shaped like a frustum, and the cone surface of the frustum is a continuously gradually changing inclined surface, after the hot airflow comes into contact with the outer peripheral surface of the heat dissipation inclined shell 173, it will form a directional flow trend along its generatrix direction, so that the hot airflow can quickly flow naturally downward / outward along the inclined surface, reducing the stagnation of the hot airflow on the outer peripheral surface of the heat dissipation inclined shell 173, thereby improving the smoothness of the hot airflow and the heat dissipation efficiency.

[0066] See Figure 2 , Figure 3 and Figure 5 In one embodiment, the stator housing 17 includes a cover plate 172 that covers the receiving cavity 1731. A circuit board 181 is fixed to the side of the cover plate 172 facing away from the receiving cavity 1731. A specific electronic component 182 is fixed to the side of the circuit board 181 facing the cover plate 172 and extends through the cover plate 172 into the receiving cavity 1731. The cover plate 172 may be, but is not limited to, connected to the stator housing 17 by fasteners such as screws. The heat dissipation channel surrounds the outer periphery of the upper bottom surface of the heat dissipation inclined housing 173, and the cover plate 172 is inside the lower bottom surface of the heat dissipation inclined housing 173. The diameter of the upper bottom surface is smaller than the diameter of the lower bottom surface.

[0067] It is understood that a through hole adapted to the specific electronic component 182 can be provided at the position corresponding to the cover plate 172 and the specific electronic component 182, through which the specific electronic component 182 passes and extends into the receiving cavity 1731.

[0068] Since the specific electronic component 182 can partially extend into the receiving cavity 1731, the length of the heat dissipation inclined shell 173 along the first direction Z is relatively long, while the length of the other end of the stator shell 17 connected to the circuit board 181 is relatively short. In this way, on the one hand, the heat dissipation length of the heat dissipation inclined shell 173 can be extended, making the outer peripheral surface of the heat dissipation inclined shell 173 more gentle than the first direction Z, which is conducive to the smooth flow of hot air along the heat dissipation inclined shell 173 and the transfer of heat. It also extends the path length of the hot air, which is beneficial to improve the heat dissipation efficiency and heat dissipation performance of the motor 100 to a certain extent. On the other hand, it can make the hot air flowing out of the heat dissipation inclined shell 173 quickly diffuse into the air.

[0069] See Figure 5 Specifically, in one embodiment, the particular electronic component 182 is a large-size component with a thickness of 5 mm or more.

[0070] More specifically, in one embodiment, the large-size element is a capacitor.

[0071] It is understood that the specific electronic component 182 can also be other large-sized components with a thickness of 5 mm or more. There can be one or more specific electronic components 182, and at least a portion of at least one specific electronic component 182 passes through the cover plate 172 and extends into the receiving cavity 1731. Specifically, in one embodiment of this application, the specific electronic component 182 is a capacitor, which is fixed to the side of the circuit board 181 facing the cover plate 172 and extends through the cover plate 172 into the receiving cavity 1731.

[0072] See Figure 2 and Figure 3 In one embodiment, the accommodating cavity 1731 accounts for more than 85% of the total accommodating volume of the stator housing 17.

[0073] The overall size of the heat dissipation inclined shell 173 is designed to be large so that the accommodating cavity 1731 has a larger accommodating volume. This is to extend the heat dissipation length of the heat dissipation inclined shell 173 and to accommodate at least part of the rotor 12, at least part of the stator assembly 13 and at least part of the specific electronic components 182. The larger accommodating volume of the accommodating cavity 1731 is conducive to the flow, discharge and transfer of heat within the accommodating cavity 1731, and to avoid the normal operation of the motor 100 being affected by excessive heat accumulation within the accommodating cavity 1731.

[0074] See Figure 2 and Figure 3 In one embodiment, the outermost contour of the orthographic projection of the heat dissipation inclined housing 173 onto the second reference plane coincides with the outermost contour of the orthographic projection of the stator housing 17 onto the second reference plane; or, the outermost contour of the orthographic projection of the heat dissipation inclined housing 173 onto the second reference plane lies within the outermost contour of the orthographic projection of the stator housing 17 onto the second reference plane; wherein, the direction parallel to the axial direction of the motor shaft 11 is defined as the first direction Z, and the second reference plane is a plane perpendicular to the first direction Z. In other words, the maximum dimension of the heat dissipation inclined housing 173 along the radial direction of the motor 100 is not greater than the maximum dimension of the stator housing 17 along the radial direction of the motor 100.

[0075] See Figure 4 Specifically, in one embodiment, the outermost contours of the heat dissipation inclined shell 173 and the stator shell 17 projected onto the second reference plane are both circular, and the dimensional difference along the radial direction of the motor 100 is in the range of 0-6mm.

[0076] When the outermost contour of the heat dissipation inclined housing 173 projected onto the second reference plane coincides with the outermost contour of the stator housing 17 projected onto the second reference plane, the dimensions of the outermost contours of the heat dissipation inclined housing 173 and the stator housing 17 projected onto the second reference plane in the radial direction of the motor 100 are equal, and the difference is 0.

[0077] When the outermost contour of the orthographic projection of the heat dissipation inclined housing 173 on the second reference plane is located within the outermost contour of the orthographic projection of the stator housing 17 on the second reference plane, the outermost contour of the orthographic projection of the heat dissipation inclined housing 173 on the second reference plane and the outermost contour of the orthographic projection of the stator housing 17 on the second reference plane form a ring, the size of which is 0-3mm along the radial direction of the motor 100.

[0078] When the maximum dimension of the stator housing 17 along the radial direction of the motor 100 is greater than the maximum dimension of the heat dissipation inclined housing 173 along the radial direction of the motor 100, the maximum dimension of the stator housing 17 along the radial direction of the motor 100 will form a blocking structure (e.g., a step in the related art) that obstructs the smooth flow of hot airflow relative to the heat dissipation inclined housing 173. The impact of hot airflow on the blocking structure will also generate noise, affecting the comfort of using household appliances including the motor 100. Therefore, under the premise of meeting the assembly control circuit module 18 and other requirements, this application tries to ensure that the maximum dimension of the stator housing 17 along the radial direction of the motor 100 is equal to or close to the maximum dimension of the heat dissipation inclined housing 173 along the radial direction of the motor 100.

[0079] See Figures 2 to 4 In one embodiment, the heat dissipation inclined housing 173 is a continuous smooth curved surface and forms an acute angle with the radial direction of the motor 100, the acute angle ranging from 70 to 85°. That is, the angle between the heat dissipation inclined housing 173 and the first direction Z ranges from 5 to 20°, so that the heat dissipation inclined housing 173 is more gentle than the first direction Z, making the angle between the outlet direction of the heat dissipation channel and the heat dissipation inclined housing 173 smaller, thereby allowing the hot airflow from the heat dissipation channel to flow out more smoothly and reducing the noise generated when the hot airflow hits the heat dissipation inclined housing 173 after flowing out of the heat dissipation channel.

[0080] See Figure 1 , Figure 2 , Figure 4 and Figure 5In one embodiment, the motor 100 further includes an impeller housing 15, which has an air inlet 151 communicating with the heat dissipation channel. The moving impeller 14 is housed within the impeller housing 15. Air flows into the heat dissipation channel from the air inlet 151 and exits from the outlet of the heat dissipation channel. The shape of the impeller housing 15 is adapted to the shape of the moving impeller 14 to reduce the size of the impeller housing 15 along the radial direction of the motor 100 to a certain extent, thereby facilitating the miniaturization of the motor 100.

[0081] Thus, by setting the impeller cover 15, a partial heat dissipation channel can be formed between the impeller cover 15 and the moving impeller 14, so as to guide the flow direction of the air flowing in from the air inlet 151, reduce the diffusion and loss of airflow. At the same time, the impeller cover 15 can also isolate the high-speed rotating moving impeller 14, prevent foreign objects from being drawn into the moving impeller 14 and damaging the moving impeller 14, and also prevent operators from accidentally touching the moving impeller 14 and causing safety accidents.

[0082] See Figure 2 , Figure 3 and Figure 5 In one embodiment, the moving impeller 14 includes an impeller top cover 141, an impeller mounting base 142, and a plurality of moving blades 143. All the moving blades 143 are evenly distributed around the circumference of the moving impeller 14, and the opposite ends of each moving blade 143 are respectively connected to the impeller top cover 141 and the impeller mounting base 142. The impeller top cover 141 is constructed as a continuous, smooth arcuate surface structure, and along the direction from the moving impeller 14 toward the stator assembly 13, the cross-section of the impeller top cover 141 is constructed to gradually increase in the surrounding area. Optionally, there are nine moving blades 143.

[0083] It is understood that the impeller cover 15 portion corresponding to the impeller top cover 141 is also constructed as a continuous and smooth arc surface structure, and the cross-sectional area of ​​the impeller cover 15 portion corresponding to the impeller top cover 141 is also constructed to gradually increase along the direction of the moving impeller 14 toward the stator assembly 13.

[0084] Because the cross-sectional area of ​​the impeller cover 15 and the moving impeller 14 facing the air inlet 151 is relatively small, the airflow velocity from the air inlet 151 is relatively high. At this time, the kinetic energy of the airflow is relatively high and the static pressure energy is relatively low, which allows the airflow to enter the heat dissipation channel more smoothly. Then, the cross-sectional area of ​​the impeller cover 15 and the moving impeller 14 gradually increases to reduce the kinetic energy of the airflow and increase the static pressure energy, thereby reducing the loss of airflow in the heat dissipation channel and allowing the airflow to flow out more stably.

[0085] See Figure 2 , Figure 3 and Figure 5 In one embodiment, the motor 100 further includes a second seal 26, which is disposed between the impeller housing 15 and the impeller top cover 141 to seal the gap between the impeller housing 15 and the impeller top cover 141. This allows all the air flowing in from the air inlet 151 to enter the moving impeller 14, preventing air leakage from the assembly gap between the impeller housing 15 and the impeller top cover 141. Optionally, the second seal 26 is a sealing ring, and the material of the sealing ring can be, but is not limited to, rubber.

[0086] See Figures 1 to 3 In one embodiment, the motor 100 further includes a mounting member 19, which is interference-fitted with the motor shaft 11 and located at the end of the motor shaft 11 facing the air inlet 151. The impeller mounting seat 142 is fixedly mounted on the mounting member 19. Optionally, the impeller mounting seat 142 and the mounting member 19 can be fixedly connected by fasteners such as screws, but are not limited to this.

[0087] Thus, by setting the mounting part 19, the impeller 14 and the motor shaft 11 are fixedly connected through the mounting part 19, making the connection more stable and also facilitating assembly and subsequent maintenance and replacement of parts.

[0088] See Figure 2 , Figure 3 and Figure 5 In one embodiment, the motor 100 further includes a bearing device 23 housed within the heat dissipation inclined housing 173. The bearing device 23 includes a second bearing 231 and a bearing seat 232. The bearing seat 232 is fixed to the cover plate 172. The second bearing 231 is sleeved on the motor shaft 11, and the inner ring of the second bearing 231 is interference-fitted with the motor shaft 11, and the outer ring of the second bearing 231 is interference-fitted with the bearing seat 232.

[0089] Thus, by setting a second bearing 231 to connect the motor shaft 11 and the bearing housing 232, the motor shaft 11 can rotate stably relative to the bearing housing 232, while the bearing housing 232 remains stationary. This also avoids the motor shaft 11 from directly contacting the bearing housing 232 and causing wear.

[0090] In one embodiment, the cover plate 172 and the bearing housing 232 are designed as an integrally formed structure to reduce the number of connecting structures and improve assembly efficiency.

[0091] See Figure 2 , Figure 3 and Figure 5In one embodiment, the stator assembly 13 includes an integrally formed iron core 131 and a coil group wound around the iron core 131. The iron core 131 is configured to surround the rotor 12. The iron core 131 includes at least one tooth 1311 configured to extend toward the rotor 12. The coil group includes at least one coil 132. The tooth 1311 and the coil 132 are arranged in a one-to-one correspondence, and each coil 132 is wound around the corresponding tooth 1311. The coil group is electrically connected to the circuit board 181.

[0092] Optionally, the iron core 131 is made of laminated silicon steel sheets with good magnetic permeability; the coil 132 is made of high-temperature resistant electromagnetic wire; the coil group and the circuit board 181 are electrically connected by wires.

[0093] In one embodiment of this application, the iron core 131 includes six teeth 1311, and the coil group correspondingly includes six coils 132, so that the six coils 132 are wound one-to-one with the six teeth 1311.

[0094] Thus, when coil 132 is energized, current flows through coil 132 to excite iron core 131, thereby forming a rotating alternating magnetic field in the hollow cavity of stator assembly 13. Under the action of the rotating alternating magnetic field, rotor 12 is subjected to electromagnetic torque with continuously changing direction, so that rotor 12 can rotate at high speed relative to stator assembly 13 around its own axis, thereby driving motor shaft 11 to rotate.

[0095] See Figure 2 , Figure 3 and Figure 5 In one embodiment, the iron core 131 further includes a yoke 1312, and all the teeth 1311 are evenly distributed on the inner circumferential surface of the yoke 1312. The yoke 1312 and the teeth 1311 are integrally formed.

[0096] Because the yoke 1312 is provided to connect all the teeth 1311, the stability of the iron core 131 is enhanced. Furthermore, the yoke 1312 can also gather the magnetic fields of each tooth 1311 and form a closed loop, reducing magnetic field leakage.

[0097] See Figure 2 , Figure 3 and Figure 5In one embodiment, the stator assembly 13 further includes a support structure 133 disposed on the stator housing 17. The support structure 133 includes at least one first support portion 1331 configured to extend toward the impeller 14. The first support portion 1331 is disposed in a one-to-one correspondence with the tooth portion 1311, and each first support portion 1331 is used to support the corresponding tooth portion 1311 and the coil 132 corresponding to that tooth portion 1311. The support structure 133 is made of an insulating material to avoid using conductive metal materials and to protect electrical safety.

[0098] In one embodiment of this application, there are six first support portions 1331, and the six first support portions 1331 support the six teeth 1311 and the six coils 132 in a one-to-one correspondence.

[0099] Specifically, in one embodiment, the end of the tooth 1311 away from the moving impeller 14 extends into the corresponding first support portion 1331, and the coil 132 corresponding to the tooth 1311 is wound around the outer peripheral surface of the tooth 1311 and the first support portion 1331.

[0100] See Figure 2 , Figure 3 and Figure 5 Furthermore, in one embodiment, the support structure 133 further includes at least one of the cover portions 1332, which are correspondingly disposed one-to-one with the first support portions 1331. The cover portions 1332 are detachably disposed on the other end of the toothed portion 1311 away from the first support portion 1331, so that the cover portions 1332 and the corresponding first support portions 1331 together define a receiving space for accommodating at least a portion of the toothed portion 1311; wherein each coil 132 is wound around the outer periphery of the corresponding first support portion 1331 and the cover portion 1332 corresponding to the first support portion 1331.

[0101] In one embodiment of this application, there are six cover portions 1332, and the six cover portions 1332 are respectively covered on the six first support portions 1331.

[0102] Because the support structure 133 includes a first support portion 1331 and a cover portion 1332 that can be detachably closed, after the first support portion 1331 and the cover portion 1332 are closed, at least the portion of the tooth portion 1311 corresponding to the part on which the coil 132 is wound can be located in the receiving space, and the coil 132 is sleeved on the outer periphery of the first support portion 1331 and the cover portion 1332 after being closed, thereby separating the coil 132 and the tooth portion 1311, so as to avoid the coil 132 from directly conducting with the tooth portion 1311 when the insulation layer is damaged, which would cause the coil 132 to short circuit and current leakage.

[0103] See Figure 2 , Figure 3 and Figure 5 In one embodiment, the support structure 133 further includes a cover 1333, all of the cover portions 1332 being evenly distributed on the inner circumferential surface of the cover 1333 and configured to extend toward the rotor 12. The cover 1333 and all the cover portions 1332 are integrally formed.

[0104] Thus, by providing a cover 1333 to provide all the cover portions 1332, the all cover portions 1332 are evenly spaced.

[0105] See Figure 2 , Figure 3 and Figure 5 In one embodiment, the first support portion 1331 is provided with a first limiting portion 1331a configured to extend away from the cover portion 1332, and the cover portion 1332 is provided with a second limiting portion 1332a configured to extend away from the first support portion 1331. Both the first limiting portion 1331a and the second limiting portion 1332a are used to restrict the movement of the corresponding coil 132 toward the rotor 12. The first limiting portion 1331a and the first support portion 1331 are integrally formed; the second limiting portion 1332a, the cover portion 1332, and the cover body 1333 are integrally formed.

[0106] Thus, by setting the first limiting part 1331a and the second limiting part 1332a, the movement of the coil 132 toward the rotor 12 is jointly restricted, thereby preventing the coil 132 from slipping.

[0107] See Figure 2 , Figure 3 and Figure 5 In one embodiment, the support structure 133 further includes a support member 1334, with all the first support portions 1331 evenly distributed on one side of the support member 1334 facing the impeller 14. The support member 1334, the first limiting portion 1331a, and the first support portions 1331 are integrally formed.

[0108] Thus, by setting the support member 1334 to set all the first support parts 1331, all the first support parts 1331 are evenly spaced.

[0109] See Figure 2 , Figure 3 and Figure 5In one embodiment, the support member 1334 includes a second support portion 1334a and a plurality of third support portions 1334b spaced apart from the stator housing 17. All of the third support portions 1334b are evenly distributed on the side of the second support portion 1334a away from the impeller 14, and all of the first support portions 1331 are evenly distributed on the side of the second support portion 1334a opposite to the third support portions 1334b. Optionally, there are three third support portions 1334b.

[0110] Thus, by providing the second support portion 1334a, all the first support portions 1331 and all the third support portions 1334b are provided, and the third support portion 1334b is provided on the stator housing 17 so that the support structure 133 is connected to the stator housing 17, thereby enabling the support structure 133 to stably support the stator assembly 13.

[0111] See Figure 2 , Figure 3 and Figure 5 In one embodiment, the motor 100 further includes a plurality of positioning members 24 corresponding one-to-one with the plurality of third support portions 1334b. The positioning members 24 are engaged with the corresponding third support portions 1334b, and the positioning members 24 are used to position and limit the circuit board 181. Optionally, there are three positioning members 24; the circuit board 181 is engaged with the stator housing 17.

[0112] Specifically, the circuit board 181 has multiple positioning holes that correspond one-to-one with the positioning members 24. The end of the positioning member 24 away from the third support part 1334b passes through the positioning hole to accurately position the circuit board 181 during installation, thereby improving installation accuracy. In addition, since the positioning member 24 cooperates with the positioning hole, it restricts the rotation of the circuit board 181 around the motor shaft 11, thereby ensuring the stability of the components and circuits on the circuit board 181. In particular, for certain electronic components 182 with large thickness dimensions, such as capacitors, it is necessary to avoid interference with other components during installation. The cooperation between the positioning member 24 and the positioning hole can ensure the accurate installation position of the circuit board 181 and achieve high installation accuracy.

[0113] See Figures 2 to 5 In one embodiment, the motor 100 further includes a base 25, which is adapted to the end of the stator housing 17 away from the impeller 14. Optionally, the base 25 is snap-fitted into the stator housing 17.

[0114] See Figure 2 , Figure 3 and Figure 5Specifically, the base 25 has a hollow structure, and the base 25 has openings at both ends along the first direction Z, so that the heat generated by the control circuit module 18 and the heat in the cavity 1731 can be discharged from the openings of the base 25, thereby improving the heat dissipation efficiency of the motor 100.

[0115] This application also provides a floor scrubbing machine (not shown) including the motor 100 described in the above embodiments, the motor 100 being used to provide driving force for the floor scrubbing machine. It is understood that the floor scrubbing machine may be equipped with one or more motors 100 as needed.

[0116] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications or equivalent substitutions made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An electric machine characterized in that, The motor comprises: a motor shaft, a stator assembly, a rotor and a moving impeller, the moving impeller and the rotor are sequentially and fixedly arranged on the motor shaft along a first direction parallel to the axial direction of the motor shaft, and the stator assembly is configured to surround the rotor; a stator impeller group, which is arranged on the motor shaft and located between the moving impeller and the rotor; a stator housing, and the stator impeller group is arranged outside the stator housing; wherein the normal projection of the stator impeller group on a first reference plane partially overlaps with the normal projection of the stator housing on the first reference plane; the first reference plane is a plane arranged parallel to the first direction.

2. The electric machine of claim 1, wherein, The stator impeller group comprises a first stator impeller and a second stator impeller which are respectively arranged on the motor shaft, and the first stator impeller is located between the moving impeller and the second stator impeller; the normal projection of the first stator impeller on the first reference plane partially overlaps with the normal projection of the stator housing on the first reference plane; and / or, the normal projection of the second stator impeller on the first reference plane partially overlaps with the normal projection of the stator housing on the first reference plane.

3. The electric machine of claim 2, wherein, The first end of the stator housing towards the moving impeller is provided with at least one first mounting hole, and the first stator impeller is provided with a second mounting hole corresponding to the at least one first mounting hole; and / or, the outer circumferential surface of the first end is provided with at least one first mounting portion, and the inner circumferential surface of the second stator impeller is provided with a second mounting portion corresponding to the at least one first mounting portion; wherein the first mounting hole and the first mounting portion are arranged alternately around the motor shaft.

4. The electric machine of claim 2, wherein, The first stator impeller is provided with an annular mounting groove, and the stator housing is provided with an annular protruding portion matched with the annular mounting groove; and / or, the second stator impeller is configured as a hollow structure, and the end portion of the stator housing towards the moving impeller is partially accommodated inside the second stator impeller.

5. The electric machine of claim 2, wherein, The end portion of the stator housing towards the moving impeller is located inside the stator impeller group.

6. The electric machine of claim 5, wherein, The end portion of the stator housing towards the moving impeller is located inside the first stator impeller and / or the second stator impeller.

7. The electric machine of claim 2, wherein, The first stator impeller and the motor shaft are provided with a first micro-gap along the radial direction of the motor shaft, and the ratio of the diameter of the center hole of the first stator impeller to the diameter of the motor shaft ranges from 1.05 to 1.2; and / or, the stator housing and the motor shaft are provided with a second micro-gap along the radial direction of the motor shaft, and the ratio of the diameter of the center hole of the stator housing to the diameter of the motor shaft ranges from 1.01 to 1.

05.

8. The electric machine of claim 2, wherein, The motor further comprises a first sealing member arranged between the first stator impeller and the stator housing.

9. The electric machine of claim 8, wherein, The motor further comprises a wear-resistant member arranged between the first sealing member and the stator housing, and the wear-resistant member is arranged on the motor shaft and configured to be in interference fit with the motor shaft.

10. The electric machine of claim 1, wherein, The motor further comprises a first bearing sleeved on the motor shaft and accommodated in the stator housing, an outer ring of the first bearing is configured to be interference-fitted with the stator housing, and an inner ring of the first bearing is configured to be interference-fitted with the motor shaft.

11. The electric machine of claim 1, wherein, The motor further comprises a control circuit module comprising a circuit board and specific electronic components, the circuit board being arranged at one end of the stator housing away from the impeller. The stator housing comprises a heat dissipation inclined surface housing enclosing a receiving cavity, at least part of the rotor, at least part of the stator assembly and at least part of the specific electronic components being located in the receiving cavity, the receiving cavity of the heat dissipation inclined surface housing gradually expanding along a direction from the first impeller to the circuit board. The impeller, the first impeller and the stator housing jointly define a heat dissipation channel, and airflow flowing out of the heat dissipation channel diffuses along an extension direction of the heat dissipation inclined surface housing.

12. The electric machine of claim 11, wherein, The stator housing comprises a cover plate member covering the receiving cavity, the circuit board being fixed to a side of the cover plate member away from the receiving cavity, and the specific electronic components being fixed to a side of the circuit board facing the cover plate member and extending into the receiving cavity through the cover plate member.

13. The electric machine of claim 11, wherein, A most outer contour of a normal projection of the heat dissipation inclined surface housing on a second reference plane coincides with a most outer contour of a normal projection of the stator housing on the second reference plane. Or, the most outer contour of the normal projection of the heat dissipation inclined surface housing on the second reference plane is located within the most outer contour of the normal projection of the stator housing on the second reference plane. The second reference plane is a plane arranged perpendicularly to a first direction parallel to an axial direction of the motor shaft.

14. A scrubber, characterized in that The motor comprises the motor according to any one of claims 1-13, and the motor is used to provide driving force for the scrubber.

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