Low-noise brushless electric motor

Abstract

A low-noise brushless electric motor, comprising: a stator assembly comprising a base (101) and a winding stator (102), wherein the base (101) comprises an end cover (103) and a sleeve (104) formed on one side of the end cover (103), the winding stator (102) is arranged around the outer wall of the sleeve (104), the sleeve (104) is made of a metal material, and a first mounting groove (105) and a second mounting groove (106) that are spaced apart from each other are formed in the sleeve (104); a bearing assembly comprising a first bearing (301), a first limiting member and a second bearing (302), wherein the first bearing (301) is arranged in the first mounting groove (105) and is in clearance fit with a groove wall (110) of the first mounting groove (105), and the second bearing (302) is arranged in the second mounting groove (106) and is in clearance fit with a groove wall (112) of the second mounting groove (106); and a rotor assembly comprising a rotary shaft (201), a housing (204) fixed on the rotary shaft (201), and a plurality of magnetic steels (202) arranged on an inner wall of the housing (204), wherein the rotary shaft (201) passes through the second bearing (302) and the first bearing (301) and is connected to the first limiting member, the second bearing (302) is in limiting fit with the rotary shaft (201), and the first bearing (301) axially abuts against the first limiting member to be axially limited on the rotary shaft (201). The low-noise brushless electric motor can reduce bearing deformation and minimize noise generation.

Description

A low-noise brushless motor Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a low-noise brushless motor. Background Art

[0002] Brushless motors have stringent noise control requirements during operation, with the coaxiality between the stator assembly and bearings being one of the factors influencing this noise. However, due to cost considerations, current brushless motors typically use plastic components for the bearing housings. Factors such as machining and assembly errors, as well as deformation caused by the interference fit between the bearings to ensure stability, can lead to poor coaxiality between the two opposing bearings, making it difficult to reduce this noise.

[0003] Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a low-noise brushless motor that can improve the stability of the bearing part and achieve the purpose of noise reduction.

[0005] The present disclosure provides a low-noise brushless motor, comprising:

[0006] The stator assembly includes a base and a winding stator, wherein the base includes an end cover and a sleeve formed on one side of the end cover, the winding stator is arranged around the outer wall of the sleeve, the sleeve is made of a metal material, and a first mounting groove and a second mounting groove are formed in the sleeve at intervals;

[0007] A bearing assembly comprising a first bearing, a first stopper, and a second bearing, wherein the first bearing is disposed in the first mounting groove and has a clearance fit with a groove wall of the first mounting groove, and the second bearing is disposed in the second mounting groove and has a clearance fit with a groove wall of the second mounting groove;

[0008] The rotor assembly includes a rotating shaft, a housing fixed to the rotating shaft, and a plurality of magnets provided on the inner wall of the housing. The rotating shaft passes through the second bearing and the first bearing to connect to the first limiting member. The second bearing is limitedly engaged with the rotating shaft. The first bearing abuts against the first limiting member in the axial direction to be axially limited on the rotating shaft.

[0009] Optionally, a through hole is provided in the middle of the end cap, the sleeve has a first side and a second side opposite to each other, the interior of the sleeve has a hollow channel passing through the first side and the second side, the first side of the sleeve is connected to the end cap, and the hollow channel passes through the through hole;

[0010] The first mounting groove is recessed from the first side to the second side of the hollow channel, and the second mounting groove is recessed from the second side to the first side of the hollow channel. The diameter of the first mounting groove and the diameter of the second mounting groove are both larger than the diameter of the hollow channel; the diameter of the first bearing is larger than the diameter of the hollow channel and smaller than the diameter of the first mounting groove, and the diameter of the second bearing is larger than the diameter of the hollow channel and smaller than the diameter of the second mounting groove.

[0011] Optionally, the base is made of metal material, and the end cover and the sleeve are integrally formed.

[0012] Optionally, the base is die-casted from ADC12 aluminum alloy.

[0013] Optionally, a guide portion is provided at the notch of the first installation slot, and the guide portion is used to guide the first bearing into the first installation slot, and the diameter of the guide portion is larger than the diameter of the first installation slot.

[0014] Optionally, an inner chamfer is provided between the groove wall of the first mounting groove and the end surface of the sleeve, and the inner chamfer forms the guide portion.

[0015] Optionally, the first bearing and / or the second bearing are / is an angular contact bearing.

[0016] Optionally, the first limiting member includes an open retaining ring.

[0017] An annular groove is provided on the outer wall of the rotating shaft, the open retaining ring is embedded in the annular groove, the first bearing is loosely fitted with the rotating shaft, the lower end face of the first bearing abuts against the bottom of the first mounting groove, and the upper end face of the first bearing is limited by the open retaining ring.

[0018] Optionally, the bearing assembly further includes a gasket, which is sleeved on the rotating shaft and clamped between the open retaining ring and the upper end surface of the first bearing.

[0019] Optionally, the bearing assembly further includes a bearing cover, an outer wall of the bearing cover is interference fit with a groove wall of the first mounting groove, and a lower end surface of the bearing cover abuts against an upper end surface of the first bearing.

[0020] Optionally, a disassembly groove is further provided at the notch of the first installation groove, and the disassembly groove extends from the first side to the second side of the sleeve and passes through the groove wall of the first installation groove, and the bearing cover partially enters the disassembly groove.

[0021] Optionally, the second bearing is interference fit with the rotating shaft.

[0022] Optionally, the bearing assembly also includes a second limit member and a buffer pad, the second limit member includes an open retaining ring, the open retaining ring and the buffer pad are respectively located on opposite sides of the second bearing, and the buffer pad is sleeved on the rotating shaft and clamped between the upper end surface of the second bearing and the bottom of the second mounting groove.

[0023] Optionally, the plurality of magnetic steels surround the winding stator in the axial direction and are arranged opposite to the winding stator in the radial direction.

[0024] Optionally, a heat dissipation gap is formed between the housing and the end cover, and the housing and the end cover are not in contact with each other.

[0025] The implementation of the above scheme has the following beneficial effects:

[0026] The present invention adopts metal material to make the sleeve, which improves the strength of the sleeve and reduces the risk of deformation of the sleeve itself. In addition, the first bearing and the second bearing are both loosely matched with the sleeve, and the first bearing and the second bearing are not in hard contact with the inner wall of the sleeve, which can ensure the stability of the sleeve structure, ensure the concentricity of the first bearing and the second bearing, reduce the deformation of the bearing itself, and thus greatly reduce the probability of noise generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG1 is a schematic structural diagram of a low-noise brushless motor provided by an embodiment of the present utility model.

[0028] FIG2 is an exploded view of a low-noise brushless motor provided in an embodiment of the present invention.

[0029] FIG3 is an exploded view of a low-noise brushless motor provided in an embodiment of the present invention.

[0030] FIG4 is a cross-sectional view of a low-noise brushless motor provided by an embodiment of the present invention.

[0031] FIG5 is a cross-sectional view of the structure after the rotating shaft and the base are assembled according to an embodiment of the present invention.

[0032] FIG6 is a cross-sectional view of the base provided in an embodiment of the present utility model.

[0033] FIG7 is a schematic structural diagram of the rotating shaft and the rotating shaft after assembly provided by an embodiment of the present utility model.

[0034] FIG8 is a cross-sectional view of the structure after the rotating shaft and the rotating shaft are assembled provided by an embodiment of the present utility model.

[0035] FIG9 is a partial cross-sectional view of a low-noise brushless motor provided in an embodiment of the present invention.

[0036] In the figure: 101 base, 102 winding stator, 103 end cover, 104 sleeve, 105 first mounting groove, 106 second mounting groove, 107 hollow channel, 108 guide portion, 109 disassembly groove, 110 groove wall of the first mounting groove, 111 groove bottom of the first mounting groove, 112 groove wall of the second mounting groove, 113 groove bottom of the second mounting groove, 201 rotating shaft, 202 magnetic steel, 203 ring groove, 204 housing, 301 first bearing, 302 second bearing, 303 open retaining ring, 304 gasket, 305 bearing cover, 306 buffer pad. DETAILED DESCRIPTION

[0037] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0040] In the description of the present utility model, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0041] It should also be noted that, in the description of this utility model, unless otherwise specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0042] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0043] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0044] This embodiment provides a low-noise brushless motor. Referring to Figures 1-9 , the low-noise brushless motor includes a stator assembly, a bearing assembly, and a rotor assembly. The stator assembly includes a base 101 and a winding stator 102. The base 101 includes an end cap 103 and a sleeve 104 formed on one side of the end cap 103. The winding stator 102 is arranged around the outer wall of the sleeve 104. The sleeve 104 is made of a metal material. A first mounting groove 105 and a second mounting groove 106 are formed therein. The bearing assembly includes a first bearing 301, a first stopper, and a second bearing 302. The first bearing 301 is disposed in the first mounting groove 105 and is loosely fitted with the groove wall 110 of the first mounting groove. The second bearing 302 is disposed in the second mounting groove 106 and is loosely fitted with the groove wall 112 of the second mounting groove. The rotor assembly includes a rotating shaft 201, a casing 204 fixed on the rotating shaft 201, and a plurality of magnets 202 arranged on the inner wall of the casing 204. The rotating shaft 201 passes through the second bearing 302, and the first bearing 301 is connected to the first limiting member. The second bearing 302 is limitedly engaged with the rotating shaft 201, and the first bearing 301 abuts against the first limiting member in the axial direction to be axially limited on the rotating shaft 201.

[0045] This embodiment uses metal to make sleeve 104. Compared to plastic parts, sleeve 104 made of metal has higher hardness and can maintain good mechanical properties in high or low temperature working environments, reducing the risk of deformation of sleeve 104 itself. The first bearing 301 and the second bearing 302 have a clearance fit with sleeve 104 and do not abut against the inner wall of sleeve 104. Therefore, they will not squeeze and deform sleeve 104, thus ensuring the stability of the sleeve 104 structure. At the same time, they also prevent the outer rings of the first bearing 301 and the second bearing 302 from deforming due to abutment against sleeve 104, preventing the balls in the bearings from being squeezed and displaced, reducing the deformation of the first bearing 301 and the second bearing 302 themselves, ensuring the concentricity of the first bearing 301 and the second bearing 302 after installation, and reducing the generation of noise during operation. In one possible implementation, as shown in Figures 5 and 6 , a through-hole is provided in the middle of the end cap 103. The sleeve 104 has opposing first and second sides. A hollow passage 107 is formed within the sleeve 104, extending through the first and second sides. The first side of the sleeve 104 is connected to the end cap 103, and the hollow passage 107 extends through the through-hole. A first mounting groove 105 is recessed from the first side of the hollow passage 107 toward the second side, while a second mounting groove 106 is recessed from the second side of the hollow passage 107 toward the first side. The diameters of the first mounting groove 105 and the second mounting groove 106 are both larger than the diameter of the hollow passage 107. The diameter of the first bearing 301 is larger than that of the hollow passage 107 and smaller than that of the first mounting groove 105. The first bearing 301 is assembled in the first mounting groove 105 via a sliding fit, with the bottom 111 of the first mounting groove supporting and limiting the lower end surface of the first bearing 301. The diameter of the second bearing 302 is larger than the diameter of the hollow channel 107 and smaller than the diameter of the second mounting groove 106. The second bearing 302 is assembled in the second mounting groove 106 by a sliding installation method, and the upper end surface of the second bearing 302 is limited by the bottom 113 of the second mounting groove.

[0046] In one possible implementation, the end cap 103 and the sleeve 104 are integrally formed. In the structure shown in FIG6 , the end cap 103 and the sleeve 104 are integrally formed, and the through hole on the end cap 103 coincides with the first side of the hollow channel 107 of the sleeve 104. The base 101 is made of a metal material. For example, the base 101 is die-cast using ADC12 aluminum alloy. This material has low density and high strength, and can maintain good mechanical properties when working in high or low temperature environments. It has good corrosion resistance and oxidation resistance, and can avoid abnormal noise in the motor caused by rusting of the first mounting groove 105 and the second mounting groove 106, thereby ensuring stable and reliable operation of the motor. In addition, ADC12 aluminum alloy also has the advantage of fast heat transfer, which can improve the heat dissipation efficiency of the motor. The side of the end cap 103 facing away from the stator assembly is used to install the circuit board. Combined with the above-mentioned advantage of fast heat transfer of ADC12 aluminum alloy, the heat generated by the circuit board can be discharged in a timely manner, ensuring the stability and safety of the circuit board's operating temperature.

[0047] It's also worth noting that the rotor assembly includes multiple magnets 202 that surround the stator winding 102 axially along the rotating shaft 201 and are radially arranged opposite the stator winding 102. Furthermore, a heat dissipation gap is formed between the housing 204 and the end cover 103, and the housing and end cover are not in contact. This arrangement allows heat generated by the rotor and stator assemblies within the housing 204 to flow out through this gap, dissipating heat promptly and ensuring that the motor's operating temperature remains within a safe range.

[0048] In one possible implementation, the first bearing 301 is loosely fitted with the rotating shaft 201. After the first bearing 301 is installed in the first mounting groove 105, the bottom 111 of the first mounting groove supports and limits the lower end face of the first bearing 301. To prevent the first bearing 301 from moving in the axial direction of the rotating shaft 201, this embodiment further provides a first limiting member, which includes an open retaining ring 303. The open retaining ring 303 limits the upper end face of the first bearing 301. Specifically, referring to Figures 5 and 9, the bearing assembly further includes an open retaining ring 303. The outer wall of the rotating shaft 201 is provided with an annular groove 203, and the open retaining ring 303 is embedded in the annular groove 203. The lower end face of the first bearing 301 abuts the bottom 111 of the first mounting groove, and the upper end face of the first bearing 301 is limited by the open retaining ring 303. Preferably, a gasket 304 can be provided between the open retaining ring 303 and the first bearing 301, and the gasket 304 can be sleeved on the rotating shaft 201 so that the gasket 304 is clamped between the open retaining ring 303 and the upper end surface of the first bearing 301, thereby restricting the first bearing 301 between the bottom 111 of the first mounting groove and the open retaining ring 303, preventing the first bearing 301 from moving axially along the rotating shaft 201.

[0049] In one possible implementation, referring to FIG9 , the bearing assembly further includes a bearing cap 305. The outer wall of the bearing cap 305 is interference-fitted with the groove wall 110 of the first mounting groove. The lower end surface of the bearing cap 305 abuts the upper end surface of the first bearing 301, specifically, the lower end surface of the bearing cap 305 abuts the upper end surface of the outer ring of the first bearing 301. After the first bearing 301 is assembled into the first mounting groove 105, the groove bottom 111 of the first mounting groove restrains the lower end surface of the first bearing 301, and the bearing cap 305 restrains the upper end surface of the first mounting groove 105, thereby securing the first bearing 301 in the first mounting groove 105.

[0050] Furthermore, a disassembly slot 109 is provided on the sleeve 104 near the bearing cap 305 to facilitate removal of the bearing cap 305 and replacement or repair of the first bearing 301. Referring to Figures 6 and 9, the disassembly slot 109 is provided at the notch of the first mounting slot 105. The disassembly slot 109 extends from the first side to the second side of the sleeve 104 and penetrates the slot wall 110 of the first mounting slot, allowing the bearing cap 305 to partially enter the disassembly slot 109. To remove the bearing cap 305, the tip of a tool, such as a screwdriver, is inserted into the disassembly slot 109 to abut against the bearing cap 305. The sleeve 104 is then used as a fulcrum to pry the bearing cap 305 away from the sleeve 104.

[0051] In one possible implementation, a guide portion 108 is provided at the opening of the first mounting groove 105. The guide portion 108 is used to guide the first bearing 301 into the first mounting groove 105. The diameter of the guide portion 108 is larger than the diameter of the first mounting groove 105. As shown in FIG6 , an inner chamfer is provided between the groove wall 110 of the first mounting groove and the end surface of the sleeve 104, forming the guide portion 108. The provision of the guide portion 108 facilitates the assembly and positioning of the first bearing 301, thereby improving the assembly efficiency of the first bearing 301.

[0052] In one possible implementation, the second bearing 302 and the rotating shaft 201 have an interference fit to prevent the second bearing 302 from moving axially along the rotating shaft 201. In another possible implementation, the second bearing 302 and the rotating shaft 201 may have a clearance fit. In this case, to prevent the second bearing 302 from moving axially along the rotating shaft 201, a second stopper may be provided between the second mounting groove 112 and the second bearing 302 so that the second bearing 302 abuts against the second stopper in the axial direction. Referring to Figures 5 and 7 , the bearing assembly includes a second stopper and a buffer pad 306 . The second stopper can be an open retaining ring. The open retaining ring and buffer pad 306 are located on opposite sides of the second bearing 302 . The buffer pad 306 is sleeved on the rotating shaft 201 and located in the second mounting groove 106 . When the stator assembly and the rotor assembly are assembled, the buffer pad 306 is clamped between the upper end surface of the second bearing 302 and the groove bottom 113 of the second mounting groove, ensuring soft contact between the upper end surface of the second bearing 302 and the groove bottom 113 of the second mounting groove, achieving axial limit while also reducing vibration and noise. For example, the buffer pad 306 can be a corrugated ring.

[0053] In one possible implementation, the first bearing 301 or the second bearing 302 is an angular contact bearing, or both the first bearing 301 and the second bearing 302 are angular contact bearings. Angular contact bearings can withstand axial and radial forces, maintain structural stability during the rotation of the rotating shaft 201, and further reduce noise.

[0054] Note that the above are merely preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions are readily apparent to those skilled in the art without departing from the scope of protection of the present invention. Therefore, while the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the appended claims.

Claims

1. A low-noise brushless motor, characterized in that, Comprising: A stator assembly, including a base (101) and a winding stator (102), the base (101) includes an end cover (103) and a sleeve (104) formed on one side of the end cover (103), the winding stator (102) is disposed around the outer wall of the sleeve (104), the sleeve (104) is made of a metal material, and a first mounting groove (105) and a second mounting groove (106) are formed at intervals within the sleeve (104); A bearing assembly, including a first bearing (301), a first limiting member, and a second bearing (302), the first bearing (301) is disposed within the first mounting groove (105) and is in clearance fit with the groove wall (110) of the first mounting groove, the second bearing (302) is disposed within the second mounting groove (106) and is in clearance fit with the groove wall (112) of the second mounting groove; A rotor assembly, including a rotating shaft (201), a housing (204) fixed to the rotating shaft (201), and a plurality of permanent magnets (202) disposed on the inner wall of the housing (204), the rotating shaft (201) passes through the second bearing (302) and the first bearing (301) to connect to the first limiting member, the second bearing (302) is in limiting fit with the rotating shaft (201), and the first bearing (301) abuts against the first limiting member axially to be axially limited on the rotating shaft (201).

2. The low-noise brushless motor according to claim 1, wherein A through hole is provided in the middle of the end cover (103), the sleeve (104) has opposite first and second sides, a hollow channel (107) that penetrates the first and second sides is provided inside the sleeve (104), the first side of the sleeve (104) is connected to the end cover (103), and the hollow channel (107) penetrates the through hole; The first mounting groove (105) is recessed from the first side to the second side of the hollow channel (107), the second mounting groove (106) is recessed from the second side to the first side of the hollow channel (107), the diameters of the first mounting groove (105) and the second mounting groove (106) are both larger than the diameter of the hollow channel (107); the diameter of the first bearing (301) is larger than the diameter of the hollow channel (107) and smaller than the diameter of the first mounting groove (105), and the diameter of the second bearing (302) is larger than the diameter of the hollow channel (107) and smaller than the diameter of the second mounting groove (106).

3. The low-noise brushless motor according to claim 1, wherein The base (101) is made of a metal material, and the end cover (103) and the sleeve (104) are integrally formed.

4. The low-noise brushless motor according to claim 2, wherein The base (101) is formed by die-casting ADC12 aluminum alloy.

5. The low-noise brushless motor according to claim 1, wherein A guiding portion (108) is provided at the notch of the first mounting groove (105). The guiding portion (108) is used to guide the first bearing (301) into the first mounting groove (105), and the diameter of the guiding portion (108) is larger than that of the first mounting groove (105).

6. The low-noise brushless motor according to claim 5, wherein An inner chamfer is provided between the groove wall (110) of the first mounting groove (105) and the end face of the sleeve (104), and the inner chamfer forms the guiding portion (108).

7. The low-noise brushless motor according to claim 1, wherein Both the first bearing (301) and / or the second bearing (302) are angular contact bearings.

8. The low-noise brushless motor according to claim 1, wherein The first limiting member includes a snap ring (303). A ring groove (203) is formed on the outer wall of the rotating shaft (201). The snap ring (303) is embedded in the ring groove (203). The first bearing (301) is in clearance fit with the rotating shaft (201). The lower end face of the first bearing (301) abuts against the bottom (111) of the first mounting groove, and the upper end face of the first bearing (301) is limited by the snap ring (303).

9. The low-noise brushless motor according to claim 8, wherein The bearing assembly further includes a gasket (304). The gasket (304) is sleeved on the rotating shaft (201) and clamped between the snap ring (303) and the upper end face of the first bearing (301).

10. The low-noise brushless motor according to claim 1, wherein The bearing assembly further includes a bearing cover (305). The outer wall of the bearing cover (305) is in interference fit with the groove wall (110) of the first mounting groove, and the lower end face of the bearing cover (305) abuts against the upper end face of the first bearing (301).

11. The low-noise brushless motor according to claim 10, wherein A disassembly groove (109) is further provided at the notch of the first mounting groove (105). The disassembly groove (109) extends from the first side to the second side of the sleeve (104) and penetrates the groove wall (110) of the first mounting groove. Part of the bearing cover (305) enters the disassembly groove (109).

12. The low-noise brushless motor according to claim 1, wherein The second bearing (302) is in interference fit with the rotating shaft (201).

13. The low-noise brushless motor according to claim 12, wherein The bearing assembly further includes a second limiting member and a buffer pad (306). The second limiting member includes a snap ring. The snap ring and the buffer pad (306) are respectively located on opposite sides of the second bearing (302). The buffer pad (306) is sleeved on the rotating shaft (201) and clamped between the upper end face of the second bearing (302) and the bottom (113) of the second mounting groove.

14. The brushless motor with low noise according to claim 1, characterized in that, A plurality of the permanent magnets (202) surround the winding stator (102) axially and are arranged opposite to the winding stator (102) radially.

15. The brushless motor with low noise according to claim 1, characterized in that, A heat dissipation gap is formed between the machine housing (204) and the end cover (103), and the machine housing (204) and the end cover (103) are not in contact with each other.

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