Motor

Abstract

The utility model relates to the technical field of motors, and provides a motor which comprises a rotor and a stator. The rotor comprises a rotor frame, a rotor magnet and a shaft; the stator comprises a stator core, a coil, a bearing holding part and a circuit board. The bearing holding part is provided with a cylindrical part extending in the axial direction, and a fixing seat is arranged at the bottom of the cylindrical part; a first positioning bulge and a plurality of uniformly distributed second positioning bulges are arranged on the fixed seat in the circumferential direction; the second positioning bulge is arc-shaped in the circumferential direction, and the height of the second positioning bulge is gradually reduced from outside to inside in the radial direction; the circuit board is fixed on the periphery of the cylindrical part and is positioned on the fixed seat; and the first positioning bulge and the plurality of second positioning bulges are in close contact with the circuit board. According to the utility model, the circuit board can be simultaneously fixed in the radial direction and the axial direction, so that the circuit board is more stably fixed on the bearing holding component, and the noise caused by infirm fixation of the circuit board is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field especially relates to a motor. BACKGROUND

[0002] The outer rotor motor used in the current high-power air purifier needs to improve the vibration noise of the motor while realizing low cost.

[0003] In the existing motor structure, the circuit board is arranged on the bearing retaining part, and the circuit board is positioned in the circumferential direction through a positioning protrusion arranged on the bearing retaining part. However, there is a lack of positioning structure in the radial direction with the motor axial center as the center, and the positioning of the circuit board in the axial direction cannot be realized, so the position fixing in the radial direction and the axial direction cannot be realized, and thus when vibration occurs, the vibration of the circuit board in the motor is strengthened, resulting in abnormal noise of the motor. SUMMARY

[0004] The utility model mainly solves the technical problem that the existing technology lacks positioning structure in the radial direction with the motor axial center as the center, cannot realize the position fixing in the radial direction and the axial direction, and thus when vibration occurs, the vibration of the circuit board in the motor is strengthened, resulting in abnormal noise of the motor, and proposes a motor which can fix the circuit board in the radial direction and the axial direction at the same time, so that the circuit board is more stably fixed on the bearing retaining part, and the noise caused by the unstable fixing of the circuit board is reduced.

[0005] The utility model provides a motor, which comprises a rotor and a stator.

[0006] The rotor comprises a rotor frame, a rotor magnet and a shaft.

[0007] The stator comprises a stator core, a coil, a bearing retaining part and a circuit board.

[0008] The bearing retaining part has a cylindrical portion extending in the axial direction, and the bottom of the cylindrical portion is provided with a fixing seat.

[0009] The fixing seat is provided with a first positioning protrusion and a plurality of second positioning protrusions uniformly distributed in the circumferential direction.

[0010] The second positioning protrusions are arc-shaped in the circumferential direction, and the height of the second positioning protrusions gradually decreases from the outside to the inside in the radial direction.

[0011] The circuit board is fixed to the outer periphery of the cylindrical portion and located on the fixing seat; the first positioning protrusion and the plurality of second positioning protrusions are in close contact with the circuit board.

[0012] Preferably, the outer periphery of the fixing seat is uniformly provided with a plurality of mounting portions.

[0013] Preferably, the mounting portion is provided with a mounting hole; and the mounting portion is provided with an extension step portion above the mounting portion.

[0014] The mounting hole and the extension step portion are provided with a threaded structure.

[0015] Preferably, the second positioning protrusion corresponds to the position of the mounting portion.

[0016] Preferably, the outer periphery of the fixing seat is provided with a plurality of extension structures.

[0017] The extension structures are connected between adjacent mounting portions.

[0018] Preferably, the extension structures are provided with a plurality of hollow structures between the extension structures and the fixing seat.

[0019] Preferably, the inner side of the stator core is uniformly provided with a plurality of long groove structures.

[0020] The outer periphery of the cylindrical member is provided with a plurality of protrusion structures extending in the axial direction.

[0021] The protrusion structures are arranged in cooperation with the long groove structures.

[0022] Preferably, the outer surface of the protrusion structure is provided with an inwardly recessed arc shape.

[0023] Preferably, the fixing seat is provided with a plurality of limiting table surfaces for fixing the stator core.

[0024] The limiting table surfaces and the second positioning protrusions are alternately arranged in the circumferential direction.

[0025] Preferably, the electronic components on the circuit board are located on the side of the circuit board away from the stator core.

[0026] The motor provided by the utility model is provided with a plurality of second positioning protrusions on the bearing retaining member, which can fix the circuit board in the radial and axial directions at the same time, so that the circuit board is more stably fixed on the bearing retaining member, and the noise caused by the unstable fixing of the circuit board can be reduced. The fixing seat adopts a double-layer structure, the radial wall thickness of the bearing retaining member is increased, the contact area with the circuit board can be increased, and the vibration noise of the circuit board can be suppressed. The utility model is provided with a threaded structure and the length of the thread is increased, so that the reliability of the connection and fixation is improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a structure diagram of the motor provided by the utility model Figure 1 ;

[0028] Figure 2 is a structure diagram of the motor provided by the utility model Figure 2 ;

[0029] Figure 3 is the internal structure schematic diagram of the motor provided by the utility model;

[0030] Figure 4 is the structure schematic diagram of the stator core provided by the utility model;

[0031] Figure 5 is the structure schematic diagram of the bearing retaining part provided by the utility model;

[0032] Figure 6 is the top view of the bearing retaining part provided by the utility model;

[0033] Figure 7 is the bottom view of the bearing retaining part provided by the utility model.

[0034] Reference signs: 1, shell; 2, bearing retaining part; 3, circuit board; 4, shaft; 5, stator core; 6, coil; 7, rotor magnet; 201, cylindrical portion; 202, fixed seat; 203, protruding structure; 204, mounting portion; 205, first positioning protrusion; 206, second positioning protrusion; 207, extension step portion; 208, limiting mesa; 209, mounting hole; 210, extension structure; 211, hollow structure; 501, long groove. DETAILED DESCRIPTION

[0035] In order to make the technical problems solved by the utility model, the technical scheme adopted and the technical effects reached more clear, the utility model will be further described in detail below in combination with the drawings and examples. It can be understood that the specific examples described here are only used to explain the utility model, not to limit the utility model. In addition, it should be noted that, in order to facilitate the description, only the parts related to the utility model are shown in the drawings, not all the contents.

[0036] As shown in Figures 1-4 , the utility model embodiment provides a kind of motor, comprising: stator and rotor.

[0037] The utility model adopts a kind of outer rotor motor.The rotor, including: rotor frame 1, rotor magnet 7, shaft 4;The rotor magnet 7 is installed in rotor frame 1 inner wall, specifically, the rotor magnet 7 uses the multiple magnetic blocks of uniform distribution in circumferential direction.The shaft 4 is stretched out from rotor frame 1, and the shaft 4 is located in the center of rotor frame 1.

[0038] The stator is located within the rotor frame 1 and the rotor magnet 7. The stator includes: a stator core 5, coils 6, a bearing retaining component 2, and a circuit board 3. Bearings are respectively installed at both ends of the inner circumference of the bearing retaining component 2, and the bearings are located on a shaft 4. The stator core 5 is mounted outside the bearing retaining component 2, and coils 6 are wound around each tooth of the stator core 5. The coils 6 and the circuit board 3 are electrically connected. The circuit board 3 is located at the bottom of the stator core 5.

[0039] The electronic components on the circuit board 3 are located on the side of the circuit board 3 away from the stator core 5, which prevents interference between the electronic components and the stator windings (stator core 5 and coil 6) and can reduce the overall axial dimension of the motor.

[0040] like Figures 5-7 As shown, the bearing retaining component 2 has a cylindrical portion 201 extending axially, and a fixing seat 202 is provided at the bottom of the cylindrical portion 201.

[0041] The fixing base 202 is provided with a first positioning protrusion 205 and a plurality of evenly distributed second positioning protrusions 206 in the circumferential direction; the second positioning protrusions 206 are arc-shaped in the circumferential direction, and the height of the second positioning protrusions 206 gradually decreases from the outside to the inside in the radial direction; the circuit board 3 is fixed to the outer periphery of the cylindrical part 201 and is located on the fixing base 202; the first positioning protrusion 205 and the plurality of second positioning protrusions 206 are in close contact with the circuit board 3. The first positioning protrusion 205 can perform circumferential positioning, and the present invention provides a plurality of second positioning protrusions 206 on the bearing retaining component 2 that can fix the circuit board 3 in both the radial and axial directions, which can more firmly fix the circuit board 3 on the bearing retaining component 2 and reduce noise caused by the loose fixing of the circuit board 3.

[0042] Multiple mounting portions 204 are evenly arranged on the outer periphery of the fixing base 202. Each mounting portion 204 has a mounting hole 209; an extended step portion 207 is located above the mounting portion 204; threaded structures are provided in the mounting holes 209 and the extended step portion 207. The second positioning protrusion 206 corresponds to the position of the mounting portion 204. This invention provides mounting portions 204 for fixing a motor to its application equipment on the outer periphery of the bearing retaining component 2 fixing base 202. Threaded structures are provided in the mounting holes 209 and the extended step portion 207 of the mounting portions 204, i.e., the threaded structures are stepped. This invention improves the reliability of the connection and fixation by providing threaded structures and increasing the thread length.

[0043] The fixing seat 202 can adopt a single-layer structure or a double-layer structure. The fixing seat 202 adopts a double-layer structure as the preferred mode of the utility model, specifically: the fixing seat 202 has multiple epitaxial structures 210 on the outer periphery; the epitaxial structures 210 are connected between adjacent mounting portions 204. The epitaxial structures 210 and the fixing seat 202 have multiple hollow structures 211 therebetween. The fixing seat 202 adopts a double-layer structure (the fixing seat 202 and the epitaxial structures 210), which increases the radial wall thickness of the bearing retaining part 2, and the fixing seat 202 and the epitaxial structures 210 are both in contact with the circuit board 3, which can increase the contact area with the circuit board 3, thereby suppressing the vibration noise of the circuit board 3 and better solving the problem of vibration noise. The hollow structures 211 are arranged between the epitaxial structures 210 and the fixing seat 202, which can appropriately save the consumption of resin materials while increasing the strength.

[0044] The inner side of the stator core 5 is uniformly distributed with multiple long groove 501; the outer periphery of the cylindrical part 201 is provided with multiple protruding structures 203 extending in the axial direction; the protruding structures 203 are arranged in cooperation with the long groove 501. The outer surface of the protruding structure 203 adopts an inwardly recessed arc shape. The protruding structure 203 is arranged in cooperation with the long groove 501, facilitating the fixed installation of the stator core 5.

[0045] Multiple limiting table surfaces 208 for fixing the stator core 5 are arranged on the fixing seat 202; the limiting table surfaces 208 and the second positioning protrusions 206 are alternately arranged in the circumferential direction. The limiting table surfaces 208 can axially position the stator core 5, and the radial outer end of the limiting table surfaces 208 is located on the radial inner side of the circuit board 3, which is convenient for molding and also facilitates the assembly of the motor.

[0046] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: the technical solutions recorded in the foregoing embodiments are modified, or some or all of the technical features are replaced, without making the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A motor comprising: A rotor and a stator; The rotor comprises a rotor frame (1), a rotor magnet (7), and a shaft (4); The stator comprises a stator core (5), a coil (6), a bearing retaining member (2), and a circuit board (3); It is characterized in that: The bearing retaining member (2) has a cylindrical portion (201) extending in the axial direction, and the bottom of the cylindrical portion (201) is provided with a fixing seat (202); The fixing seat (202) is provided with a first positioning protrusion (205) and a plurality of second positioning protrusions (206) uniformly distributed in the circumferential direction; The second positioning protrusions (206) are arc-shaped in the circumferential direction, and the height of the second positioning protrusions (206) gradually decreases from outside to inside in the radial direction; The circuit board (3) is fixed to the outer periphery of the cylindrical portion (201) and located on the fixing seat (202); the first positioning protrusion (205) and the plurality of second positioning protrusions (206) are in close contact with the circuit board (3).

2. The motor of claim 1, wherein The outer periphery of the fixing seat (202) is uniformly provided with a plurality of mounting portions (204).

3. The motor of claim 2, wherein Mounting holes (209) are left on the mounting portions (204); the mounting portions (204) have extension step portions (207) above them; Threaded structures are provided in the mounting holes (209) and the extension step portions (207).

4. The motor of claim 2, wherein The second positioning protrusions (206) correspond in position to the mounting portions (204).

5. The motor of claim 2, wherein The outer periphery of the fixing seat (202) has a plurality of extension structures (210); The extension structures (210) are connected between adjacent mounting portions (204).

6. The motor of claim 5, wherein There are a plurality of hollow structures (211) between the extension structures (210) and the fixing seat (202).

7. The motor of claim 1, wherein The inner side of the stator core (5) is uniformly distributed with a plurality of long groove (501); The outer periphery of the cylindrical member (201) is provided with a plurality of protruding structures (203) extending in the axial direction; The protruding structures (203) are arranged in cooperation with the long grooves (501).

8. The motor of claim 7, wherein The outer surface of the protruding structure (203) is arc-shaped inwardly recessed.

9. The motor of claim 1, wherein A plurality of limiting platforms (208) for fixing the stator core (5) are provided on the fixing seat (202); The limiting platforms (208) and the second positioning protrusions (206) are alternately arranged in the circumferential direction.

10. The motor of claim 1, wherein The electronic components on the circuit board (3) are located on the side of the circuit board (3) away from the stator core (5).

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