Miniature brush motor structure

Abstract

A miniature brush motor structure comprises a shell, a stator, a rotor, a carbon brush and an end cover, and is characterized in that the carbon brush is connected to a carbon brush plate, the middle part of the carbon brush plate is provided with a plate body through hole through which a rotating shaft of the rotor can pass, the carbon brush plate is connected to the shell close to a rotor fan blade, the outer wall of the shell corresponding to the rotor fan blade is provided with a ventilation hole, and the end cover is connected with the stator through the ventilation hole. And the end cover covers the carbon brush plate. The utility model has the advantages that the carbon brush plate is inversely arranged on the shell close to the rotor fan blade, the height of the iron core does not need to be reduced, the position and the structure of the motor carbon brush are compact, the occupied space is small, and the performance of the motor is fully exerted in a limited space; the carbon brush plate is close to the rotor fan blades, the rotor fan blades can take away heat at the positions of the carbon brushes, the effect of cooling the carbon brush mounting structure is achieved, and the carbon brush mounting structure is small in temperature rise and long in service life during working.

Description

Technical Field

[0001] The utility model relates to the technical field of micro motor manufacturing, in particular to a micro brush motor structure. Background Art

[0002] There is a Chinese utility model patent with application number CN201721861475.5 and the name of "A wear-resistant micro brush motor", which discloses a wear-resistant micro brush motor, including a main body shell, a No. 1 flip cover movably installed on the front end outer surface of the main body shell, a No. 2 flip cover movably installed on the rear end outer surface of the main body shell, a fixing screw fixedly installed on the front end inner surface of the No. 1 flip cover, a rotating shaft movably installed on the front end center part of the No. 1 flip cover, a card slot fixedly installed on the rear end inner surface of the rotating shaft, a carbon brush shell fixedly installed on the outer surface of the rotating shaft, a card block fixedly installed on the inner periphery of the carbon brush shell, and arc-shaped carbon brushes fixedly installed on both sides of the outer surface of the carbon brush shell. The wear-resistant micro brush motor described in the utility model is provided with a flip cover, a card slot and an arc-shaped carbon brush, which can prevent the cover from being lost and can be easily disassembled and replaced, and can also increase wear resistance, improve service life, save costs, and bring better usage prospects. However, when the brushed motor is in use, the temperature of the carbon brush increases, which can easily damage the carbon brush mounting structure and affect the service life of the motor. Therefore, the structure of the brushed motor needs to be further improved. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a micro brush motor structure with a compact structure, a small temperature rise of the carbon brush installation structure during operation and a long service life in view of the above-mentioned existing technical status.

[0004] The technical solution adopted by the utility model to solve the above technical problems is: the micro brush motor structure includes a shell, a stator, a rotor, a carbon brush, and an end cover, and is characterized in that: the carbon brush is connected to a carbon brush plate, a plate through hole that can pass through the rotor shaft is provided in the middle of the carbon brush plate, the carbon brush plate is connected to the shell close to the rotor blades, ventilation holes are provided on the outer wall of the shell corresponding to the rotor blades, and the end cover is covered on the carbon brush plate.

[0005] As an improvement, the carbon brush plate may preferably be provided with a heat insulation sheet, and the carbon brushes are connected to the heat insulation sheet.

[0006] As a further improvement, the carbon brush may preferably include a brush body and a brush holder, wherein the brush holder is connected to the heat insulation sheet, and the brush body is inserted and connected in a cavity surrounded by the brush holder and the heat insulation sheet.

[0007] As a further improvement, a connection hole may be preferably provided at the bottom of the carbon brush plate, and a connection hole is also provided at a corresponding position of the heat insulation sheet, and the pins of the brush holder pass through the heat insulation sheet and are plugged into the carbon brush plate.

[0008] As a further improvement, a side wall opening may be preferably provided on the side of the brush holder, and a brush flap is provided on the side of the brush body, the brush flap extends out of the brush holder and is connected to a conductive sheet, and the conductive sheet is connected to the carbon brush plate.

[0009] As a further improvement, the side of the conductive sheet may preferably be provided with a protruding portion, and the protruding portion is spot-welded to the brush flap.

[0010] As a further improvement, the end of the brush body may be preferably connected to one end of a torsion spring, the torsion spring is sleeved on a carbon brush plate boss on one side of the brush holder, and the other end of the torsion spring contacts the inner wall of the carbon brush plate.

[0011] As an improvement, a magnetic protection ring may preferably be sleeved on the outer wall of the shell.

[0012] As an improvement, one end of the housing may preferably be provided with connection notches at intervals, the carbon brush plate is mounted on the connection notches, and the end cover is sleeved on the conductive sheet connection column of the carbon brush plate.

[0013] As an improvement, the rotor may preferably include a commutator, fan blades, a rotating shaft, silicon steel sheets, a copper ring, and a rotor frame. The commutator, rotor frame, and copper ring are sequentially sleeved on the rotating shaft, the fan blades and silicon steel sheets are respectively inserted into the rotor frame, one end of the rotating shaft passes through a first bearing, the first bearing is fixed in a middle groove of the shell, the other end of the rotating shaft passes through a second bearing, and the second bearing is fixed in a positioning groove of the end cover.

[0014] Compared with the prior art, the advantages of the utility model are: the carbon brush plate is inverted on the shell near the rotor blades, there is no need to lower the height of the iron core, the position of the motor carbon brush is guaranteed, the structure becomes compact, and the space occupied is small, ensuring that the motor performance is fully exerted in a limited space; the carbon brush plate is close to the rotor blades, and the rotor blades can take away the heat from the carbon brush position, playing a role in cooling the carbon brush installation structure. The carbon brush installation structure has a small temperature rise during operation and a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A three-dimensional diagram of an embodiment of the utility model;

[0016] Figure 2 for Figure 1 Front projection of

[0017] Figure 3 yes Figure 2 Sectional view along line AA;

[0018] Figure 4 yes Figure 1 The structural breakdown diagram of

[0019] Figure 5 yes Figure 4 Further structural decomposition diagram of ;

[0020] Figure 6 yes Figure 5 Further structural decomposition diagram of ;

[0021] Figure 7 yes Figure 6 Further structural decomposition diagram of ;

[0022] Figure 8 yes Figure 7 Schematic diagram of the structure of the medium carbon brush plate;

[0023] Fig. 9 yes Figure 8 Structural breakdown diagram. DETAILED DESCRIPTION

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0025] like Figures 1 to 9 As shown, the micro brush motor structure of this embodiment includes a housing 1, a stator 2, a rotor 3, a carbon brush, and an end cover 5. The carbon brush is connected to a carbon brush plate 4. A plate through hole that can pass through the rotor shaft is provided in the middle of the carbon brush plate 4. The carbon brush plate 4 is connected to the housing 1 close to the rotor blades. A ventilation hole 11 is provided on the outer wall of the housing corresponding to the rotor blades. The end cover 5 covers the carbon brush plate 4. A heat insulation sheet 41 is provided on the carbon brush plate 4, and the carbon brush is connected to the heat insulation sheet 41. The carbon brush includes a brush body 42 and a brush holder 43. The brush holder 43 is connected to the heat insulation sheet 41. The brush body 42 is connected to the cavity surrounded by the brush holder 43 and the heat insulation sheet 41.

[0026] A connection hole is provided at the bottom of the carbon brush plate 4, and a connection hole is also provided at the corresponding position of the heat insulation sheet 41. The pins of the brush holder 43 pass through the heat insulation sheet 41 and are plugged into the carbon brush plate 4. A side wall opening is provided at the side of the brush holder 43, and a brush flap 421 is provided at the side of the brush body 42. The brush flap 421 extends out of the brush holder 43 and is connected to the conductive sheet 44, and the conductive sheet 44 is connected to the carbon brush plate 4.

[0027] The conductive sheet 44 is provided with an extension portion on its side, and the extension portion is spot-welded to the brush flap 421. The end of the brush body 42 is connected to one end of a torsion spring 45, and the torsion spring 45 is sleeved on the carbon brush plate protrusion on one side of the brush holder, and the other end of the torsion spring 45 contacts the inner wall of the carbon brush plate. A magnetic protection ring 6 is sleeved on the outer wall of the housing 1. A connection notch 12 is provided at one end of the housing 1, and the carbon brush plate 4 is mounted on the connection notch 12, and the end cover 5 is sleeved on the conductive sheet connection column 46 of the carbon brush plate 4.

[0028] The rotor 3 includes a commutator 31, a fan blade 32, a rotating shaft 33, a silicon steel sheet, a copper ring, and a rotor frame 34. The commutator 31, the rotor frame 34, and the copper ring are sequentially sleeved on the rotating shaft 33. The fan blade 32 and the silicon steel sheet are respectively plugged into the rotor frame 34. One end of the rotating shaft 33 passes through a first bearing 35, which is fixed in a middle groove of the housing 1. The other end of the rotating shaft 33 passes through a second bearing 36, which is fixed in a positioning groove of the end cover 5. The specific structure of the stator 2 belongs to the known technology, so it is no longer necessary to believe the description.

[0029] Working principle: The carbon brush plate is changed to inverted mounting, which does not need to lower the core height, ensuring the position of the motor carbon brush and ensuring that the motor can fully exert its performance in a limited space. Adding a heat shield to the carbon brush plate overcomes the problem of plastic parts deformation caused by excessive temperature under high power; the carbon brush uses a brush petal structure to ensure the stability of current input.

[0030] The copper terminals and brushes are spot welded to ensure production efficiency and motor operation stability.

[0031] The outer diameter of the motor is increased to 37-39mm to ensure the power of the motor; the rotor core uses 25-26mm to ensure the power of the motor.

Claims

1. A micro brushed motor structure, comprising a housing (1), a stator (2), a rotor (3), a carbon brush, and an end cover (5), characterized in that: The carbon brush is connected to a carbon brush plate (4), a plate through hole capable of passing a rotor shaft is provided in the middle of the carbon brush plate (4), the carbon brush plate (4) is connected to a housing (1) close to the rotor blades, a ventilation hole (11) is provided on an outer wall of the housing corresponding to the rotor blades, and the end cover (5) covers the carbon brush plate (4).

2. The micro brushed motor structure according to claim 1, characterized in that: A heat insulation sheet (41) is provided on the carbon brush plate (4), and the carbon brush is connected to the heat insulation sheet (41).

3. The micro brushed motor structure according to claim 2, characterized in that: The carbon brush comprises a brush body (42) and a brush holder (43); the brush holder (43) is connected to a heat insulating sheet (41); and the brush body (42) is inserted and connected in a cavity surrounded by the brush holder (43) and the heat insulating sheet (41).

4. The micro brushed motor structure according to claim 3, characterized in that: A connection hole is provided at the bottom of the carbon brush plate (4), and a connection hole is also provided at a corresponding position of the heat insulation sheet (41); the pins of the brush holder (43) pass through the heat insulation sheet (41) and are plugged into the carbon brush plate (4).

5. The micro brushed motor structure according to claim 3, characterized in that: A side wall opening is provided on the side of the brush holder (43), a brush flap (421) is provided on the side of the brush body (42), the brush flap (421) extends out of the brush holder (43) and is connected to a conductive sheet (44), and the conductive sheet (44) is connected to the carbon brush plate (4).

6. The micro brushed motor structure according to claim 5, characterized in that: A protruding portion is provided on the side of the conductive sheet (44), and the protruding portion is spot-welded to the brush flap (421).

7. The micro brushed motor structure according to claim 5, characterized in that: The end of the brush body (42) is connected to one end of a torsion spring (45), the torsion spring (45) is sleeved on a carbon brush plate boss on one side of the brush holder, and the other end of the torsion spring (45) contacts the inner wall of the carbon brush plate.

8. The micro brushed motor structure according to any one of claims 1 to 7, characterized in that: A magnetic protection ring (6) is sleeved on the outer wall of the shell (1).

9. The micro brushed motor structure according to any one of claims 1 to 7, characterized in that: A connection notch (12) is arranged at one end of the housing (1), the carbon brush plate (4) is mounted on the connection notch (12), and the end cover (5) is sleeved on the conductive sheet connection column (46) of the carbon brush plate (4).

10. The micro brushed motor structure according to any one of claims 1 to 7, characterized in that: The rotor (3) comprises a commutator (31), a fan blade (32), a rotating shaft (33), a silicon steel sheet, a copper ring, and a rotor frame (34). The commutator (31), the rotor frame (34), and the copper ring are sequentially sleeved on the rotating shaft (33). The fan blade (32) and the silicon steel sheet are respectively plugged into the rotor frame (34). One end of the rotating shaft (33) passes through a first bearing (35), and the first bearing (35) is fixed in a middle groove of the housing (1). The other end of the rotating shaft (33) passes through a second bearing (36), and the second bearing (36) is fixed in a positioning groove of the end cover (5).

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