Motor structure and brushless motor

Abstract

The utility model belongs to the technical field of motors, and particularly relates to a motor structure and a brushless motor. The annular clearance groove is formed in the bearing chamber, so that when the bearing is mounted, the contact surface between the bearing chamber and the bearing is adjusted by changing the size of the annular clearance groove, the inward shrinkage degree of the bearing is further changed, and the effect of being matched with a rotating shaft is achieved. Through the arrangement of the annular clearance groove, when the motor is designed, the problems of high production cost and long development time caused by the fact that the aperture size is not matched due to the internal shrinkage of the bearing and the mold needs to be opened again finally are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and particularly relates to a motor structure and a brushless motor. Background Art

[0002] Bearings are commonly used components in motors and play a very important role in ensuring the stable, efficient and low-noise operation of motors. Among bearings, powder metallurgy bearings are bearings made by powder metallurgy process. This process mixes metal powders and then forms solid parts through pressing and sintering processes. Powder metallurgy bearings are usually used in small motors, household appliances, automobiles and other industrial applications.

[0003] However, in the prior art, the texture of the powder metallurgy bearing itself is relatively soft, which leads to the shrinkage of the inner hole of the powder metallurgy bearing when the powder metallurgy bearing contacts the side wall of the bearing chamber after being installed in the bearing chamber, and further fails to match the predetermined shaft core size, resulting in the inability to install the shaft core. This further requires the entire mold to be re-opened and re-tested. Such minor adjustments often require multiple debuggings, which greatly increases the production cost and the production cycle of the motor. Summary of the Utility Model

[0004] To achieve the above object, the utility model is provided with an annular clearance groove in the bearing chamber. By changing the size of the annular clearance groove, the contact surface between the bearing and the bearing chamber during bearing installation is reduced, and further the shrinkage degree of the inner hole of the bearing is reduced. By this method, the fit between the bearing chamber and the bearing during shaft core installation can be adjusted only by adjusting the size of the annular clearance groove, reducing the cost of re-opening the mold.

[0005] The object of the utility model is achieved in the following way:

[0006] In a first aspect, the utility model provides a motor structure, including:

[0007] A stator assembly; the stator assembly includes a stator base and bearings. At least one bearing chamber is provided in the stator base, the bearings are arranged in the bearing chambers, and an installation through hole is provided through the stator base, and the installation through hole penetrates through all bearing chambers; and

[0008] A rotor assembly; the rotor assembly includes a shaft core and a rotor structure; the shaft core is installed on the stator assembly through the installation through hole; the rotor structure is fixedly connected to the shaft core and the rotor structure is arranged on the outer circumferential side of the stator assembly;

[0009] Wherein, an annular clearance groove is provided in the bearing chamber, and the bearing chamber adjusts the contact surface between the bearing fixed on the stator base and the bearing chamber by adjusting the annular clearance groove to adjust the shrinkage degree of the bearing.

[0010] By providing an annular clearance groove in the bearing chamber, when the shaft core is arranged on the stator base of the stator assembly through the mounting through-hole, the annular clearance groove reduces the contact surface between the bearing chamber and the bearing, and further makes the degree of inward contraction of the bearing during installation vary with the size of the annular clearance groove. In the above manner, when adjusting the size of the bearing chamber, only by adjusting the size of the annular clearance groove can the design of the entire motor stator assembly be achieved, rather than re-opening the mold for the entire stator assembly, reducing the waste of production costs caused by repeated mold opening and further reducing the production cycle. At the same time, in the design of the annular clearance groove, when the powder metallurgy bearing is installed, the generated debris will fall into the groove, which can prevent the debris from accumulating at the bottom of the bearing, thereby preventing the incomplete installation of the bearing. The debris in the annular clearance groove will also hinder the removal of the bearing, further making the bearing installation more stable.

[0011] In some preferred embodiments, there is one annular clearance groove and it is arranged in the middle of the bearing chamber.

[0012] Having one annular clearance groove arranged in the middle makes the shrinkage forces received by the upper and lower ends of the bearing relatively uniform during installation.

[0013] Optionally, there are two annular clearance grooves, which are respectively arranged near the upper and lower ends of the bearing chamber.

[0014] In some embodiments, the bearing chamber includes a bearing chamber inlet portion and a bearing chamber outlet portion; the annular clearance groove is arranged between the bearing chamber inlet portion and the bearing chamber outlet portion.

[0015] The bearing chamber includes a bearing chamber inlet and a bearing chamber outlet. During installation, the bearing is installed in the bearing chamber from the bearing chamber inlet. The annular clearance groove is arranged between the bearing chamber inlet portion and the bearing chamber outlet portion, and the setting position of the annular clearance groove is determined according to the specific bearing force.

[0016] In some embodiments, the annular clearance groove is provided with a first side wall and a second side wall. The first side wall is close to the bearing chamber inlet portion, and the second side wall is close to the bearing chamber outlet portion. The second side wall is an arc surface or an inclined surface.

[0017] The annular clearance groove is composed of two side walls. The first side wall is close to the bearing chamber inlet portion and the second side wall is close to the bearing chamber outlet portion. Among them, the second side wall is an arc surface or an inclined surface, so that the bottom of the bearing is not stuck in the annular clearance groove during installation. Further, when the shaft core is installed, the bottom of the shaft core is not stuck in the annular clearance groove.

[0018] In some embodiments, the bearing chamber inlet portion is provided with a first inclined surface, and the bearing chamber outlet portion is provided with a second inclined surface.

[0019] A first inclined surface is provided at the entrance of the bearing chamber so that the bearing is guided into the bearing chamber by the first inclined surface during installation, and further, when the shaft core is installed, the shaft core is guided into the bearing chamber by the first inclined surface. A second inclined surface is provided at the exit of the bearing chamber so that the shaft core is guided out of the bearing chamber by the second inclined surface during installation, and further, when the shaft core is installed, the shaft core is guided out of the bearing chamber by the second inclined surface and enters the installation through-hole outside the bearing chamber.

[0020] In some embodiments, the installation through-hole is provided with a shaft core entrance portion and a shaft core exit portion; a clamping protrusion is provided at the shaft core exit portion.

[0021] The shaft core is installed into the stator assembly through the shaft core entrance portion of the installation through-hole, and when the end of the shaft core extends to the shaft core exit portion, the end of the shaft core is clamped by the clamping protrusion, thereby realizing the clamping of the shaft core in the entire installation through-hole.

[0022] In some embodiments, the shaft core is provided with a clamping structure, and the clamping structure includes a chamfered portion and a clamping groove. The chamfered portion is provided at one end of the shaft core, and the clamping groove is connected to the chamfered portion; the chamfered portion is an arc surface or an inclined surface so that the clamping protrusion is clamped into the clamping groove through the chamfered portion.

[0023] The clamping structure is provided with a chamfered portion and a clamping groove. The chamfer is provided at the end of the shaft core. During installation, the chamfer of the shaft core contacts the clamping protrusion and guides the clamping protrusion into the clamping groove, finally realizing the installation of the shaft core.

[0024] In some embodiments, the stator base is provided with two bearing chambers, and the bearing chambers are arranged facing each other.

[0025] The bearing chambers are arranged at the shaft core entrance portion and the shaft core exit portion of the installation through-hole, and are usually arranged in a mirror image for bearing installation so that the bearings are respectively installed into the bearing chambers through the shaft core entrance portion and the shaft core exit portion.

[0026] In some embodiments, the stator assembly further includes a housing, one end of the housing is fixedly connected to the stator base, and the rotor assembly and the stator assembly are both arranged inside the housing.

[0027] By providing the housing, a running space for the stator assembly and the rotor assembly of the motor is provided, and the stator assembly and the rotor assembly are protected.

[0028] In a second aspect, the present utility model provides a brushless motor, including any one of the above motor structures.

[0029] The motor structure and the brushless motor of the present utility model produce beneficial effects:

[0030] By providing an annular clearance groove in the bearing chamber, when installing the bearing, the contact surface between the bearing chamber and the bearing can be adjusted by changing the size of the annular clearance groove, thereby changing the degree of inward contraction of the bearing and achieving the effect of matching the rotating shaft. Through the provision of this annular clearance groove, when designing the motor, it is possible to avoid problems such as the mismatch of the aperture size caused by the inward contraction of the bearing, and finally the high production cost and long development time caused by the need to re-open the mold. Brief Description of the Drawings

[0031] Figure 1 Structural diagram of the motor of the present utility model;

[0032] Figure 2 Structural diagram of the stator base and bearing chamber of the present utility model;

[0033] Figure 3 is Figure 2 Enlarged view of part b;

[0034] Figure 4 Schematic diagram of the installation through-hole of the present utility model;

[0035] Figure 5 is Figure 1 Enlarged view of part a;

[0036] Figure 6 Schematic diagram of the shaft core part of the present utility model.

[0037] Reference Signs:

[0038] 100, stator assembly; 110, stator base; 111, installation through-hole; 1111, shaft core inlet part; 1112, shaft core outlet part; 112, clamping protrusion; 120, bearing; 130, bearing chamber; 1301, first inclined surface; 1302, second inclined surface; 131, annular clearance groove; 1311, first side wall; 1312, second side wall;

[0039] 200, rotor assembly; 210, shaft core; 211, chamfered part; 212, clamping groove; 220, rotor structure;

[0040] 300, housing. Detailed Description of the Preferred Embodiments

[0041] It should be noted that, without conflict, the embodiments and technical features in the embodiments of the present utility model can be combined with each other. The detailed description in the specific implementation manners should be understood as an explanatory illustration of the purpose of the present utility model and should not be regarded as an improper limitation of the present utility model.

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will further describe in detail the specific technical solutions of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0043] In the embodiments of the present utility model, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present utility model, unless otherwise stated, the meaning of "a plurality" is two or more.

[0044] In addition, in the embodiments of the present utility model, orientation terms such as "upper", "lower", "left", and "right" are defined relative to the orientation in which the components in the accompanying drawings are schematically placed. It should be understood that these directional terms are relative concepts, and they are used for relative description and clarification, and they can change accordingly with the change of the orientation in which the components in the accompanying drawings are placed.

[0045] In the embodiments of the present utility model, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or integrated; it can be directly connected or indirectly connected through an intermediate medium.

[0046] In the embodiments of the present utility model, the terms "include", "comprise", or any other variant thereof are intended to cover non-exclusive inclusion. Without further limitation, elements defined by the statement "including one..." do not exclude the existence of additional identical elements in the process, method, article, or device including such element.

[0047] In the embodiments of the present utility model, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present utility model should not be construed as being more preferred or having more advantages than other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant in a specific manner.

[0048] Embodiment 1:

[0049] As Figure 1 shown, this embodiment provides a motor structure, including:

[0050] Stator assembly 100; the stator assembly 100 includes a stator base 110 and a bearing 120. The stator base 110 is provided with at least one bearing chamber 130, the bearing 120 is arranged in the bearing chamber 130, and an installation through hole 111 is arranged through the stator base 110, and the installation through hole 111 penetrates through all bearing chambers 130;

[0051] Rotor assembly 200; the rotor assembly 200 includes a shaft core 210 and a rotor structure 220; the shaft core 210 is installed on the stator assembly 100 through the installation through hole 111; the rotor structure 220 is fixedly connected to the shaft core 210 and the rotor structure 220 is arranged on the outer circumferential side of the stator assembly 100; and a housing 300; the housing 300 is arranged outside the rotor assembly 200,

[0052] Wherein, an annular clearance groove 131 is arranged in the bearing chamber 130, and the bearing chamber 130 adjusts the contact surface between the bearing 120 fixed on the stator base 110 and the bearing chamber 130 by adjusting the annular clearance groove 131 to adjust the degree of inward contraction of the bearing 120.

[0053] Specifically, the motor structure is provided with a stator assembly 100, the stator assembly 100 includes a stator base 110, and other stator structures are also arranged on the upper circumferential side of the stator base 110. The stator structure includes windings. A bearing chamber 130 for arranging the bearing 120 is arranged in the stator base 110, and an installation through hole 111 is arranged in the stator base 110. The installation through hole 111 is used for installing the shaft core 210 of the rotor. The installation through hole 111 passes through each bearing chamber 130 so that when the shaft core 210 is installed, the shaft core 210 abuts against the bearing 120 in all bearing chambers 130 with the rotor structure 220. The rotor structure 220 is arranged on the outer peripheral side of the stator assembly 100, wraps the stator structure, and a housing 300 is arranged on the rotor structure 220 to include the entire rotor structure 220, and further includes all the above-mentioned stator assemblies 100 and rotor assemblies 200.

[0054] Further, during design and debugging, by adjusting the size, shape, depth, etc. of the annular clearance groove 131, gradually adjusting the annular clearance groove 131 from small to large, so that the degree of inward contraction of the bearing 120 installed in the bearing chamber 130 is exactly the size of the aperture of the corresponding shaft core 210.

[0055] Preferably, the clearance groove is selected to have a rectangular cross-section so that the force on the entire clearance groove is more uniform.

[0056] By providing an annular clearance groove 131 in the bearing chamber 130, when the shaft core 210 is disposed on the stator base 110 of the stator assembly 100 through the mounting through hole 111, the annular clearance groove 131 reduces the contact surface between the bearing chamber 130 and the bearing 120. Furthermore, the degree of inward contraction of the bearing 120 during installation varies with the size of the annular clearance groove 131. In this way, when adjusting the size of the bearing chamber 130, only by adjusting the size of the annular clearance groove 131 can the design of the entire motor stator assembly 100 be achieved, rather than remolding the entire stator assembly 100, which reduces the waste of production costs due to repeated mold opening and further reduces the production cycle. At the same time, with the design of the annular clearance groove 131, when the powder metallurgy bearing 120 is installed, the generated debris will fall into the groove, preventing the debris from accumulating at the bottom of the bearing 120 and further preventing the incomplete installation of the bearing 120. The debris in the annular clearance groove 131 will also hinder the removal of the bearing 120, further making the installation of the bearing 120 more stable.

[0057] Embodiment 2:

[0058] As Figures 2 to 6 shown, this embodiment is based on Embodiment 1 and further illustrates and defines the structure described in Embodiment 1.

[0059] In some preferred embodiments, there is one annular clearance groove 131 and it is provided in the middle of the bearing chamber 130.

[0060] Specifically, the annular clearance groove 131 is provided in the middle of the bearing chamber 130, and the size, depth, and shape of the annular clearance groove 131 are adjusted according to the aperture of the installed shaft core 210. The annular clearance groove 131 is provided in the middle, and the two sides of the transverse axis of the annular clearance groove 131 are kept the same in size and shape, which can make the reduced amounts of the contact surfaces with the bearing 120 on both sides of the annular clearance groove 131 the same, making the inward contraction amount of the entire bearing 120 controllable and overall uniform.

[0061] With one annular clearance groove 131 provided in the middle, when the bearing 120 is installed, the contraction forces received at the upper and lower ends of the bearing 120 are relatively uniform.

[0062] Optionally, there are two annular clearance grooves 131, and they are respectively provided near the upper and lower ends of the bearing chamber 130.

[0063] Specifically, the annular clearance grooves 131 are symmetrically provided at the upper and lower ends of the bearing chamber 130 and are the same in size and shape, so that the contact surfaces at the upper and lower ends are as consistent as possible, and further making the inward contraction amount of the entire bearing 120 controllable.

[0064] The setting of the above-mentioned annular clearance groove 131 needs to be actually set according to specific circumstances. When setting, the clearance groove can be asymmetrically set according to the design accuracy of the motor, or the annular clearance groove 131 can be set according to the shrinkage amount distribution of the bearing 120 model, so as to change the contact surface and then adjust the shrinkage amount of the bearing 120.

[0065] In some embodiments, the bearing housing 130 includes a bearing housing inlet portion and a bearing housing outlet portion; the annular clearance groove 131 is provided between the bearing housing inlet portion and the bearing housing outlet portion.

[0066] Specifically, the bearing housing 130 is provided with a bearing housing inlet portion and a bearing housing outlet portion. A platform for placing the bearing 120 is provided at the outlet portion. During installation, when the bearing 120 is pushed onto the platform and abuts, the installation is completed. However, when the powder metallurgy bearing 120 is installed, burrs or debris will be generated. As the installation progresses, the burrs and debris will accumulate under the bearing 120, resulting in the bearing 120 being unable to abut against the bottom during installation. After designing the annular clearance groove 131, the debris or burrs will fall into the annular clearance groove 131, so that the bearing 120 can abut against the platform.

[0067] The bearing housing 130 includes a bearing housing 130 inlet and a bearing housing 130 outlet. During installation, the bearing 120 is installed between the bearing housing 130 through the bearing housing 130 inlet. The annular clearance groove 131 is provided between the bearing housing inlet portion and the bearing housing outlet portion. The setting position of the annular clearance groove 131 is determined according to the specific force on the bearing 120.

[0068] In some embodiments, the annular clearance groove 131 is provided with a first side wall 1311 and a second side wall 1312. The first side wall 1311 is close to the bearing housing inlet portion, and the second side wall 1312 is close to the bearing housing outlet portion. The second side wall 1312 is an arc surface or an inclined surface.

[0069] Specifically, an arc surface or an inclined surface is provided on the second side wall 1312. In cooperation with the arc surface provided at the bottom of the bearing 120, during installation, the arc surface or the inclined surface prevents the bearing 120 from being stuck in the annular clearance groove 131, and further makes the installation of the bearing 120 more convenient.

[0070] The annular clearance groove 131 is composed of two side walls. The first side wall 1311 is close to the bearing housing inlet portion, and the second side wall 1312 is close to the bearing housing outlet portion. The second side wall 1312 is an arc surface or an inclined surface, so that during installation, the bottom of the bearing 120 is not stuck in the annular clearance groove 131. Further, when the shaft core 210 is installed, the bottom of the shaft core 210 is not stuck in the annular clearance groove 131.

[0071] In some embodiments, a first inclined surface 1301 is provided at the inlet of the bearing chamber, and a second inclined surface 1302 is provided at the outlet of the bearing chamber.

[0072] Specifically, a first inclined surface 1301 is provided at the inlet of the bearing chamber. The bearing 120 is introduced into the mounting through-hole 111 by the first inclined surface 1301, making the installation of the bearing 120 more convenient. A second inclined surface 1302 is provided at the outlet of the bearing chamber. The shaft core 210 is led out of the bearing chamber 130 from the outlet of the bearing chamber by the second inclined surface 1302 and further introduced into the mounting through-hole 111.

[0073] A first inclined surface 1301 is provided at the inlet of the bearing chamber 130 so that the bearing 120 is introduced into the bearing chamber 130 by the first inclined surface 1301 during installation. When the shaft core 210 is installed, the shaft core 210 is introduced into the bearing chamber 130 by the first inclined surface 1301. A second inclined surface 1302 is provided at the outlet of the bearing chamber 130 so that the shaft core 210 is led out of the bearing chamber 130 by the second inclined surface 1302 during installation. When the shaft core 210 is installed, the shaft core 210 is led out of the bearing chamber 130 by the second inclined surface 1302 and enters the mounting through-hole 111 outside the bearing chamber 130.

[0074] In some embodiments, the mounting through-hole 111 is provided with a shaft core inlet 1111 and a shaft core outlet 1112; a clamping protrusion 112 is provided at the shaft core outlet 1112.

[0075] Specifically, the mounting through-hole 111 is provided with a shaft core inlet 1111 and a shaft core outlet 1112. The shaft core 21 is installed through the shaft core inlet 1111 and is installed to the clamping protrusion 112 at the shaft core outlet 1112, thereby connecting the rotor assembly 200 and the stator assembly 100.

[0076] The shaft core 210 is installed into the stator assembly 100 through the mounting through-hole 111 via the shaft core inlet 1111. When the end of the shaft core 210 extends to the shaft core outlet 1112, the end of the shaft core 210 is clamped by the clamping protrusion 112, thereby realizing the clamping of the shaft core 210 in the entire mounting through-hole 111.

[0077] In some embodiments, the shaft core 210 is provided with a clamping structure. The clamping structure includes a chamfered portion 211 and a clamping groove 212. The chamfered portion 211 is provided at one end of the shaft core 210, and the clamping groove 212 is connected to the chamfered portion 211; the chamfered portion 211 is an arc surface or an inclined surface to enable the clamping protrusion 112 to be clamped into the clamping groove 212 through the chamfered portion 211.

[0078] Specifically, the clamping structure of the shaft core 210 includes a chamfered part 211 and a clamping groove 212. The chamfered part 211 is provided with a cambered surface. When the shaft core 210 is installed, the cambered surface has a guiding effect on the shaft core 210. During production and installation, the installation time can be reduced and the installation efficiency can be increased. At the same time, the existence of the cambered surface enables the clamping protrusion 112 to have a guiding structure relative to a rigid structure when it is on the clamping structure, which further avoids damaging the entire motor base during installation.

[0079] The clamping structure is provided with a chamfered part 211 and a clamping groove 212. The chamfer is arranged at the end of the shaft core 210. During installation, the chamfer of the shaft core 210 contacts the clamping protrusion 112 and guides the clamping protrusion 112 into the clamping groove 212, finally realizing the installation of the shaft core 210.

[0080] In some embodiments, the stator base 110 is provided with two bearing chambers 130, and the bearing chambers 130 are arranged facing each other.

[0081] The shaft core inlet part 1111 is provided with a first bearing chamber 130, and the shaft core inlet part 1111 is provided with a second bearing chamber 130. The outlet parts of the first bearing chamber 130 and the second bearing chamber 130 are arranged oppositely, so that the inlet parts of the first bearing chamber 130 and the second bearing chamber 130 both face the outside of the stator base 110, thereby facilitating the installation of the bearings 120.

[0082] The bearing chambers 130 are arranged at the shaft core inlet part 1111 and the shaft core outlet part 1112 of the installation through hole 111. And for the installation of the bearings 120, they are usually arranged in a mirror image so that the bearings 120 are respectively installed into the bearing chambers 130 from the shaft core inlet part 1111 and the shaft core outlet part 1112.

[0083] Embodiment 3:

[0084] Based on Embodiment 1 and Embodiment 2, this embodiment further illustrates some application scenarios of the motor structure.

[0085] Please refer to Figure 1 As shown, this embodiment provides a brushless motor. Among them, the stator assembly 100 further includes a housing 300. One end of the housing 300 is fixedly connected to the stator base 110, and the rotor assembly 200 and the stator assembly 100 are both arranged inside the housing 300.

[0086] Specifically, the housing wraps the outside of the rotor assembly 100 and is fixed on the stator base 110 of the stator assembly 100, and is connected to an external power supply through the stator base 110. The housing 300 is further provided with a through hole for the shaft core 210 to extend out of the housing.

[0087] By providing the housing, a running space for the stator assembly and the rotor assembly of the motor is provided, and the stator assembly and the rotor assembly are protected.

[0088] It includes any one of the motor structures in Embodiment 1 and Embodiment 2.

[0089] Specifically, by setting the annular clearance groove 131 in the motor structure, the motor can adjust the clearance groove and then adjust the inner diameter shrinkage of the bearing 120, so that the bearing 120 fits the shaft core 210 better.

[0090] By setting the above motor structure, the motor has a bearing chamber 130 during installation, and the inner shrinkage degree of the bearing 120 is adjusted through the annular clearance groove 131 in the bearing chamber 130.

[0091] The serial numbers of the utility model embodiments are only for description and do not represent the advantages or disadvantages of the embodiments. The above are only the preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent device or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present utility model.

Claims

1. A motor structure, characterized in that, Comprising: A stator assembly (100); the stator assembly (100) includes a stator base (110) and bearings (120), the stator base (110) is provided with at least one bearing chamber (130), the bearings (120) are arranged in the bearing chambers (130), and an installation through-hole (111) is penetrated through the stator base (110), and the installation through-hole (111) penetrates through all the bearing chambers (130); And a rotor assembly (200); the rotor assembly (200) includes a shaft core (210) and a rotor structure (220); the shaft core (210) is installed on the stator assembly (100) through the installation through-hole (111); the rotor structure (220) is fixedly connected to the shaft core (210) and the rotor structure (220) is arranged on the outer circumferential side of the stator assembly (100); Wherein, an annular clearance groove (131) is arranged in the bearing chamber (130), and the bearing chamber (130) adjusts the contact surface between the bearing (120) fixed on the stator base (110) and the bearing chamber (130) by adjusting the annular clearance groove (131) to adjust the degree of inward contraction of the bearing (120).

2. The motor structure according to claim 1, wherein, There is one annular clearance groove (131) and it is arranged in the middle of the bearing chamber (130).

3. The motor structure according to claim 1, wherein, The bearing chamber (130) includes a bearing chamber inlet part and a bearing chamber outlet part; the annular clearance groove (131) is arranged between the bearing chamber inlet part and the bearing chamber outlet part.

4. The motor structure according to claim 3, wherein, The annular clearance groove (131) is provided with a first side wall (1311) and a second side wall (1312), the first side wall (1311) is close to the bearing chamber inlet part, the second side wall (1312) is close to the bearing chamber outlet part, and the second side wall (1312) is an arc surface or an inclined surface.

5. The motor structure according to claim 3, characterized in that The bearing chamber inlet part is provided with a first inclined surface (1301), and the bearing chamber outlet part is provided with a second inclined surface (1302).

6. The motor structure according to claim 1, wherein The installation through-hole (111) is provided with a shaft core inlet part (1111) and a shaft core outlet part (1112); a clamping protrusion (112) is arranged at the shaft core outlet part (1112).

7. The motor structure according to claim 6, wherein, The shaft core (210) is provided with a clamping structure, the clamping structure includes a chamfered part (211) and a clamping groove (212), the chamfered part (211) is arranged at one end of the shaft core (210), and the clamping groove (212) is connected to the chamfered part (211); the chamfered part (211) is an arc surface or an inclined surface so that the clamping protrusion (112) is clamped into the clamping groove (212) through the chamfered part (211).

8. The motor structure according to claim 1, characterized in that, The stator base (110) is provided with two bearing chambers (130), and the bearing chambers (130) are arranged in a mirror image.

9. The motor structure according to claim 1, characterized in that, The stator assembly (100) further includes a housing (300), one end of the housing (300) is fixedly connected to the stator base (110), and the rotor assembly (200) and the stator assembly (100) are both arranged in the housing (300).

10. A brushless motor, characterized in that, Including the motor structure according to any one of claims 1-9.

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