CN218920182U

CN218920182U - Miniaturized motor

Info

Publication number: CN218920182U
Application number: CN202222860755.1U
Authority: CN
Inventors: 艾峰; 秦云峰; 王威廉
Original assignee: Kingclean Electric Co Ltd
Current assignee: Kingclean Electric Co Ltd
Priority date: 2022-10-28
Filing date: 2022-10-28
Publication date: 2023-04-25
Anticipated expiration: 2032-10-28

Abstract

The utility model discloses a miniaturized motor, which comprises a stator assembly, a rotor assembly, an electric brush, a commutator, a fan, an upper bracket and a lower bracket, wherein the upper bracket and the lower bracket are respectively positioned at the upper end and the lower end of the motor, one end of the stator assembly is fixedly connected with the lower bracket, the other end of the stator assembly is fixedly connected with the upper bracket, the rotor assembly and the fan are fixedly sleeved on a rotating shaft, the commutator is connected with the rotor assembly, the electric brush is abutted with the commutator, at least one air inlet is arranged at the upper end of the motor, an air outlet is arranged on the lower bracket, and at least part of air flow enters from the air inlet, passes through the stator assembly and/or the rotor assembly after flowing through the electric brush and the commutator, and finally flows out from the air outlet. The miniaturized motor provided by the utility model has a good heat dissipation effect, and the service life of the motor is prolonged.

Description

Miniaturized motor

Technical Field

The utility model relates to the technical field of motors, in particular to a miniaturized motor.

Background

The mower is used as a garden greening machine, is mainly used for pruning and finishing green lands such as urban street gardens, street green belts and family courtyards, and is the most widely applied garden machine. In order to facilitate carrying and operation of the mower, the mower motor preferably adopts a motor with small volume and large power, and the large power is accompanied with the increase of heat productivity.

At present, the cooling air duct inside most miniaturized motors has a single heat dissipation path, so that the motor of the mower has poor heat dissipation effect, and the motor is easy to burn due to heat accumulation.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model provides a miniaturized motor, which has good heat dissipation effect and prolongs the service life of the motor.

The utility model provides a miniaturized motor, includes stator module, rotor subassembly, brush, commutator, fan and is located respectively upper bracket and the lower carriage of motor upper end and lower extreme, stator module one end with lower carriage fixed connection, the other end with upper bracket fixed connection, rotor subassembly and fan are all fixed the cover and are established in the pivot, the commutator with rotor subassembly connects, the brush with commutator butt, the upper end of motor is provided with at least one air inlet, be provided with the air outlet on the lower carriage, at least part air current is followed the air inlet gets into, and flows through after brush and the commutator again through stator module and/or rotor subassembly, follow finally the air outlet flows.

Further, the air inlet comprises a first air inlet and a second air inlet, the first air inlet and the second air inlet are formed in the upper support, motor cooling air flow enters from the first air inlet and the second air inlet respectively, directly acts on the brushes and the reverser and passes through a gap between the stator assembly and the rotor assembly, and finally passes through the lower support and flows out of the air outlet.

Further, the air inlet further comprises a third air inlet, the third air inlet is formed between the upper bracket and the stator assembly, the motor cooling air flow enters from the third air inlet, directly acts on the rotor assembly and then passes through a gap between the stator assembly and the rotor assembly, and finally passes through the lower bracket and flows out of the air outlet.

Further, a bearing chamber for installing an upper bearing is arranged in the upper bracket, a plurality of installation ribs are uniformly distributed on the inner wall of the bearing chamber, and the installation ribs are fixedly connected with the upper bearing.

Further, a plurality of second air inlets are formed between the upper bearing and the inner wall of the bearing chamber, and the area of the second air inlets is 120-125mm ² 。

Further, a brush tube for accommodating the electric brush is further arranged on the upper bracket, and the first air inlet is formed between the brush tube and the bearing chamber.

Further, the upper bracket is further provided with a mounting frame, the mounting frame is fixedly connected with the stator assembly, and a gap between the mounting frame and the stator assembly forms the third air inlet.

Further, the lower bracket is in clearance uniform fit with the fan, and the distance between the lower bracket and the fan is 1-2mm.

Further, the lower support comprises a shell, the shell is provided with an accommodating cavity, the stator assembly is partially accommodated in the accommodating cavity, the stator assembly is in clearance fit with the accommodating cavity, and the distance between the stator assembly and the accommodating cavity is 0.2-0.8mm.

Further, the lower support still include with shell integrated into one piece's support frame, the support frame include supporting part and with lower bearing fixed mounting's boss portion, the supporting part sets up between boss portion and the shell, the support frame is concave surface form.

Compared with the prior art, the utility model has the advantages that:

1. the motor is provided with a first air inlet, a second air inlet and a third air inlet at one end close to the electric brush and the commutator, and cooling air flow entering from the first air inlet directly acts on the electric brush and the commutator, passes through a gap between the stator assembly and the rotor assembly, passes through the lower bracket and flows out from the air outlet; the cooling air flow entering from the second air inlet also directly acts on the electric brush and the commutator, passes through the gap between the stator assembly and the rotor assembly, finally passes through the lower bracket and flows out from the air outlet; the cooling air flow entering from the third air inlet directly acts on the rotor assembly, passes through a gap between the stator assembly and the rotor assembly, finally passes through the lower bracket and flows out from the air outlet. The material using cost can be reduced by arranging at least one air inlet, the weight and the volume of the motor are reduced, and the cooling air flow entering from the first air inlet and the second air inlet can not only reduce the high temperature generated by the work of the rotor winding, but also remove the abrasive dust on the electric brush, reduce the temperature of the electric brush and the surface of the commutator, further reduce the abrasion loss of the electric brush, prolong the service life of the motor, and the cooling air flow entering from the third air inlet is matched with the cooling air flow entering from the first air inlet and the second air inlet to cool the rotor winding, so that the heat dissipation effect of the motor is greatly improved, and the service life of the motor is prolonged by more than 10%.

2. Through setting the support frame to concave form, and the clearance is even between support frame and the fan, has greatly improved hot-blast discharge efficiency.

Drawings

Fig. 1 is a schematic structural view of a miniaturized motor according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of the overall structure of the upper bracket;

FIG. 3 is a schematic diagram of the overall structure of the upper bracket;

FIG. 4 is a schematic view of the overall structure of the lower bracket;

FIG. 5 is a top view of a mower motor;

FIG. 6 isbase:Sub>A cross-sectional view taken along the direction A-A of FIG. 5;

FIG. 7 is an enlarged view of a portion of FIG. 6;

FIG. 8 is an enlarged view of a portion of FIG. 5;

FIG. 9 is a partial cross-sectional view of a mower motor;

fig. 10 is a quarter sectional view of a mower motor.

1. A rotating shaft; 2. a stator assembly; 3. a rotor assembly; 4. an upper bracket; 40. a first air inlet; 41. a second air inlet; 42. a third air inlet; 43. a bearing chamber; 430. an inner wall; 431. installing ribs; 432. a main body portion; 433. a boss; 434. a bending part; 44. brushing a tube; 45. a mounting frame; 450. a side surface portion; 451. a planar portion; 5. a lower bracket; 50. an air outlet; 51. a housing; 510. a receiving chamber; 52. a support frame; 520. a support part; 521. a boss portion; 6. a brush; 7. a commutator; 8. a fan; 80. a blade; 9. an upper bearing; 10. a lower bearing; 11. an upper end; 12. and a lower end.

Detailed Description

The technical scheme of the utility model is further described in non-limiting detail below with reference to the preferred embodiments and the accompanying drawings. In the description of the present utility model, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. refer to the azimuth or positional relationship based on the azimuth or positional relationship shown in the drawings. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

As shown in fig. 1-9, a miniaturized motor according to an embodiment of the present utility model includes a rotating shaft 1, a stator assembly 2, a rotor assembly 3, an upper support 4 and a lower support 5 respectively located at an upper end 11 and a lower end 12 of the motor, an electric brush 6, a commutator 7 and a fan 8, wherein one end of the stator assembly 2 is fixedly connected with the lower support 5, the other end is fixedly connected with the upper support 4, a space is provided between the rotor assembly 3 and the stator assembly 2, a space a is 0.8-1.2mm, the rotor assembly 3 and the fan 8 are both sleeved on the rotating shaft 1 and are in interference fit with the rotating shaft 1, an upper bearing 9 is provided between the rotating shaft 1 and the upper support 4, a lower bearing 10 is provided between the rotating shaft 1 and the lower support 5, the commutator 7 is connected with the rotor assembly 3, and the electric brush 6 is in butt joint with the commutator 7. The upper end 11 of motor is provided with at least one air inlet, is provided with air outlet 50 on the lower carriage 5, and at least one air inlet compares air outlet 50 to be close to brush 6 or commutator 7 setting, and the motor is close to brush 6 and the one end of commutator 7 are provided with at least one air inlet, and wherein, the air inlet includes first air intake 40, second air intake 41 and third air intake 42, is provided with air outlet 50 on the lower carriage 5, and fan 8 adaptation air outlet 50, and specifically, lower carriage 5 and fan 8 clearance even fit, and the interval L between the lower carriage 5 with the fan 8 is 1-2mm. At least part of the air flow enters from the air inlet, flows through the brushes 6 and the commutator 7, passes through the stator assembly 2 and/or the rotor assembly 3, and finally flows out from the air outlet 50. The motor cooling air flow enters from at least one air inlet, flows out from the air outlet 50 after penetrating through the motor, and through the arrangement of at least one air inlet, the weight of the motor is reduced, the material cost is reduced, a plurality of cooling air channels can be formed in the motor under the driving of the fan 8, the cooling effect of the motor is greatly improved, and the service life of the motor is prolonged.

The upper bracket 4 is internally provided with a bearing chamber 43 for installing an upper bearing 9, a brush tube 44 for accommodating the electric brush 6 and a mounting frame 45 fixedly connected with the stator assembly 2, a first air inlet 40 is formed between the brush tube 44 and the bearing chamber 43, the first air inlet 40 is elliptical, and under the driving of the fan 8, the cooling air flow of the motor enters from the first air inlet 40, directly acts on the electric brush 6 and the commutator 7, passes through a gap between the stator assembly 2 and the rotor assembly 3, and finally passes through the lower bracket 5 and flows out from the air outlet 50. The cooling air flow formed by the air duct can not only reduce the high temperature generated by the work of the rotor winding, but also remove the abrasive dust on the electric brush 6, reduce the temperature of the surfaces of the electric brush 6 and the commutator 7, further reduce the abrasion loss of the electric brush 6 and prolong the service life of the motor.

Referring to fig. 8, a plurality of mounting ribs 431 are uniformly distributed on an inner wall 430 of the bearing chamber 43, and a circular arc chamfer is formed at a joint of the mounting ribs 431 and the inner wall 430, wherein a radius r of the circular arc chamfer is 0.3-0.7mm. The mounting rib 431 is fixedly connected with the upper bearing 9. A plurality of second air inlets 41 are formed between the upper bearing 9 and the inner wall 430 of the bearing chamber 43 at intervals of the mounting ribs 431, and the area S of the second air inlets 41 is 120-125mm ² . The motor cooling air enters from the plurality of second air inlets 41 under the drive of the fan 8, directly acts on the brushes 6 and the commutator 7, passes through the gap between the stator assembly 2 and the rotor assembly 3, finally passes through the lower bracket 5 and flows out from the air outlets 50. The second air inlet 41 and the first air inlet 40 jointly cool and protect the electric brush 6 and the commutator 7, and the service life of the motor is prolonged.

The mounting rib 431 includes a main body portion 432, a protruding portion 433 is disposed at one end of the main body portion 432, a bending portion 434 is disposed at the other end of the main body portion 432, the main body portion 432 is fixedly connected with the upper bearing 9, the bending portion 434 is used for limiting the upper bearing 9, and the bending portion 434 is used for enhancing stability of the structure of the bearing chamber 43.

The mounting frame 45 on the upper bracket 4 is fixedly connected with the stator assembly 2, and a gap between the mounting frame 45 and the stator assembly 2 forms the third air inlet 42. The motor cooling air enters from the third air inlet 42, directly acts on the rotor assembly 3, passes through the gap between the stator assembly 2 and the rotor assembly 3, finally passes through the lower bracket 5 and flows out from the air outlet 50. The third air inlet 42 is matched with the first air inlet 40 and the second air inlet 41, so that cooling air flows entering from the third air inlet 42, the first air inlet 40 and the second air inlet 41 can cool the rotor assembly 3, and the heat dissipation effect of the motor is greatly improved.

Referring to fig. 9, the mounting bracket 45 includes a side portion 450 and a plane portion 451, and the distance b between the side portion 450 and the rotor assembly 3 is 1.5-2.5mm, and the distance c between the plane portion 451 and the rotor assembly 3 is 2-3mm.

The lower bracket 5 comprises a shell 51 and a supporting frame 52 which is integrally formed with the shell 51, the shell 51 is provided with a containing cavity 510, the stator assembly 2 is partially contained in the containing cavity 510, the stator assembly 2 is in clearance fit with the containing cavity 510, and the distance d between the stator assembly 2 and the containing cavity 510 is 0.2-0.8mm.

The supporting frame 52 comprises a supporting portion 520 and a boss portion 521 fixedly installed with the lower bearing 10, the supporting portion 520 is arranged between the boss portion 521 and the housing 51, the air outlet 50 is arranged in the supporting portion 520, and the discharging efficiency of hot air is greatly improved by arranging the supporting frame 52 to be concave and in clearance uniform fit with the blades 80 on the fan 8.

In operation, referring to fig. 10, under the drive of the fan 8, the cooling air flow outside the motor enters the interior of the motor from different air inlets, and a plurality of air channels X are formed inside the motor: one enters from the first air inlet 40, directly acts on the electric brush 6 and the commutator 7, passes through the gap between the stator assembly 2 and the rotor assembly 3, finally passes through the lower bracket 5 and flows out from the air outlet 50; secondly, the electric brush enters from the second air inlet 41, directly acts on the electric brush 6 and the commutator 7, passes through the gap between the stator assembly 2 and the rotor assembly 3, finally passes through the lower bracket 5 and flows out from the air outlet 50; and thirdly, the cooling air flow enters from the third air inlet 42, directly acts on the rotor assembly 3, passes through the gap between the stator assembly 2 and the rotor assembly 3, finally passes through the lower bracket 5 and flows out from the air outlet 50. The use cost of materials can be reduced and the weight and the volume of the motor can be reduced by arranging at least one air inlet. The cooling air flow entering from the first air inlet 40 and the second air inlet 41 not only can reduce the high temperature generated by the work of the rotor winding, but also can remove the abrasive dust on the electric brush 6, reduce the temperature of the surfaces of the electric brush 6 and the commutator 7, further reduce the abrasion loss of the electric brush 6, and prolong the service life of the motor. The cooling air flow entering from the third air inlet 42 is matched with the cooling air flow entering from the first air inlet 40 and the second air inlet 41 to cool the rotor winding, so that the heat dissipation effect of the motor is greatly improved, and the service life of the motor is prolonged by more than 10%.

The foregoing examples illustrate only a few embodiments of the utility model and are described in detail herein without thereby limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims

1. The utility model provides a miniaturized motor, includes stator module (2), rotor subassembly (3), brush (6), commutator (7), fan (8) and is located respectively upper bracket (4) and lower carriage (5) of motor upper end (11) and lower extreme (12), stator module (2) one end with lower carriage (5) fixed connection, the other end with upper bracket (4) fixed connection, rotor subassembly (3) and fan (8) are all fixed the cover and are established on pivot (1), commutator (7) with rotor subassembly (3) are connected, brush (6) with commutator (7) butt, its characterized in that, upper end (11) of motor are provided with at least one air inlet, be provided with air outlet (50) on lower carriage (5), at least part air current follow the air inlet gets into, and flows through after stator module (2) and/or rotor subassembly (3) again after brush (6) and commutator (7), follow at last air outlet (50).

2. The miniaturized motor according to claim 1, characterized in that the air inlet comprises a first air inlet (40) and a second air inlet (41), the first air inlet (40) and the second air inlet (41) are arranged on the upper bracket (4), motor cooling air flows respectively enter from the first air inlet (40) and the second air inlet (41), directly act on the brushes (6) and the reverser (7) and then pass through a gap between the stator assembly (2) and the rotor assembly (3), and finally pass through the lower bracket (5) and flow out from the air outlet (50).

3. The miniaturized motor according to claim 1, characterized in that the air inlet further comprises a third air inlet (42), the third air inlet (42) is formed between the upper bracket (4) and the stator assembly (2), the motor cooling air flow enters from the third air inlet (42), directly acts on the rotor assembly (3) and then passes through the gap between the stator assembly (2) and the rotor assembly (3), finally passes through the lower bracket (5) and flows out from the air outlet (50).

4. The miniaturized motor according to claim 2, characterized in that a bearing chamber (43) for installing an upper bearing (9) is arranged in the upper bracket (4), a plurality of installation ribs (431) are uniformly distributed on the inner wall (430) of the bearing chamber (43), and the installation ribs (431) are fixedly connected with the upper bearing (9).

5. A miniaturized motor according to claim 4, characterized in that a plurality of second air inlets (41) are formed between the upper bearing (9) and the inner wall (430) of the bearing chamber (43), the area of the plurality of second air inlets (41) being 120-125 mm.

6. The miniaturized motor according to claim 4, characterized in that the upper bracket (4) is further provided with a brush tube (44) for accommodating the brush (6), and the first air inlet (40) is arranged between the brush tube (44) and the bearing chamber (43).

7. A miniaturized motor according to claim 3, characterized in that the upper bracket (4) is further provided with a mounting bracket (45), the mounting bracket (45) is fixedly connected with the stator assembly (2), and a gap between the mounting bracket (45) and the stator assembly (2) forms the third air inlet (42).

8. A miniaturized motor according to claim 1, characterized in that the lower bracket (5) and the fan (8) are in a uniform fit with a clearance, and the distance between the lower bracket (5) and the fan (8) is 1-2mm.

9. The miniaturized motor according to claim 1, characterized in that the lower bracket (5) comprises a housing (51), the housing (51) is provided with a containing cavity (510), the stator assembly (2) is partially contained in the containing cavity (510), the stator assembly (2) and the containing cavity (510) are in clearance fit, and the distance between the stator assembly (2) and the containing cavity (510) is 0.2-0.8mm.

10. The miniaturized motor according to claim 9, characterized in that the lower bracket (5) further comprises a supporting frame (52) integrally formed with the housing (51), the supporting frame (52) comprises a supporting portion (520) and a boss portion (521) fixedly mounted with the lower bearing (10), the supporting portion (520) is disposed between the boss portion (521) and the housing (51), and the supporting frame (52) is concave.