WO2011063651A1

WO2011063651A1 - Outer rotor brushless dc motor

Info

Publication number: WO2011063651A1
Application number: PCT/CN2010/074643
Authority: WO
Inventors: 郭守华; 邵浩锡; 黄剑来; 蒋亮健
Original assignee: 佛山市南海区东唐电机厂
Priority date: 2009-11-25
Filing date: 2010-06-28
Publication date: 2011-06-03
Also published as: CN102075050A

Abstract

An outer rotor brushless DC motor includes an outer rotor assembly, a stator coil assembly (5, 28, 51, and 71), and a stator bearing bracket (11, 27, 45, and 67), a stator protection end cover (6, 38, 50, and 63) and a DC controlled circuit board (12, 33, 44, and 83). A casing (2, 37, 59, and 62) is fixed at the edge of the stator protection end cover (6, 38, 50, and 63). An outer rotor side protection end cover (1, 36, 57 and 78) is provided on the other end of the casing (2, 37, 59, and 62). An outer rotor solid shaft (8, 30, 56, and 72) passes through the outer rotor side protection end cover (1, 36, 57 and 78) and is provided with a power output transfer fixing structure, such that the problem that the power output with a conventional inner rotor motor is not completely compatible, which results from taking the outer rotor shaft to be protruded outside from the side of the outer rotor casing or the stator protection end cover, is solved. The heat radiating problem of key elements is solved with the built-in blowing-in cooling means of providing a fan blade (26, 48, 73, and 105) on the outer rotor solid shaft and the external blowing-in cooling means of providing a DC controlled circuit board box (84 and 88) and an air-cooled chamber (81 and 95) outside the casing. The employ limit about wires being directed from the side of the stator protection end cover is overcome with a wire outlet (106) provided on the casing.

Description

External rotor DC brushless motor

The present invention relates to a brushless DC motor, and more particularly to an outer rotor DC brushless motor. Background technique

At present, the power output transmission mode of the prior art outer rotor DC brushless motor is mainly that the outer rotor shell or the outer rotor shaft on the side of the stator protection end cover is a power output transmission member, and is concentrically set on the outer rotor shell. a fan impeller cylinder, an electric wheel 轱, or by attaching a coupling member to the outer rotor shaft on one side of the stator protection end cover, thereby transmitting the power output to the actual use functional component, such as the outer rotor housing and the stator The outer rotor DC brushless motor with the outer rotor shaft on one side of the protective cover is a power output transmission member, which has the advantages of high electromechanical efficiency, power saving, clear resolution of magnetic signal, large torque, stable operation and low noise. It is especially suitable for use in some specific products in the professional fields such as ventilation equipment and electric vehicles. However, most of the conventional electric motors used in industrial machinery and household appliances currently use either one end or both ends of the inner rotor electric shaft as power output transmission members, compared with the prior art. The rotor housing and the outer rotor DC brushless motor with the outer rotor outer rotor shaft as the power output transmission member are present in the inner rotor shaft of the conventional motor in terms of the diameter and the output transmission portion of the power output transmission member. It is not fully compatible with the promotion of application barriers, it is difficult to be compatible in most household appliances and industrial equipment. To promote the application, this needs improvement. In addition, the prior art outer rotor DC brushless motor can only be installed in the fixed position of the stator protection end cover, and the conventional inner rotor motor can be arbitrarily set in the motor housing and the protective end cover at both ends. Compared with the multi-directional multi-position installation method, there is a great difference in installation and use, which is difficult to adapt to the installation requirements of various different occasions of the existing machine, especially for floor-standing installation and use; The key electronic components in the DC control circuit board inside the stator protection end cover of the DC brushless motor are limited by the internal position conditions of the stator protection end cover, and there is accumulated heat, which also adversely affects the service life and working reliability of the product. These problems are in need of improvement. Summary of the invention

The technical problem to be solved by the present invention is to provide an outer rotor DC brushless motor which is compatible not only with the power output transmission member and the conventional inner rotor motor, but also with the conventional inner rotor motor in terms of installation and use and product reliability integrity. .

In order to solve the above technical problem, the outer rotor DC brushless motor of the present invention comprises a stator coil assembly, a stator bearing bracket, a bearing mounted in the stator bearing bracket, a stator protection end cover, an outer rotor housing, a permanent magnet, and an outer rotor. An outer rotor assembly consisting of a solid shaft of a rotor, a DC electronically controlled circuit board, and one end of the solid shaft of the outer rotor is fixed in the shaft of the stator shaft bracket, and the casing is fixed at the edge of the stator protection end cover, and the other end of the casing is placed outside. The rotor side protection end cover, the outer rotor solid shaft passes through the protective end cover, and the outer rotor solid shaft body which is exposed outside the protective end cover and can be coupled with other members to form a power output has a power output transmission fixing structure, The power output transmission fixed structure is a W slot. As a first technical solution for realizing the outer shaft of the outer rotor to pass through the protective end cover in the basic concept of the present invention, the stator bearing bracket has two bearings built therein as the outer shaft solid shaft fulcrum, and the outer rotor side protection end cover has a through hole at the center. The outer rotor solid shaft is fixed at one end of the outer rotor shell through the outer rotor shell and the outer rotor side protection end cover central through hole, and passes out of the outer rotor side protection end cover.

As a second technical solution for realizing the solid shaft of the outer rotor to pass through the protective end cover in the basic concept of the present invention, the stator shaft bracket has two shafts built therein as the solid shaft fulcrum of the outer rotor, and a through hole is formed in the center of the stator protection end cover. The solid outer shaft of the outer rotor is adjacent to the central end of the stator protection end cover and passes through the central end of the stator protection end cover.

As a third technical solution for realizing the outer shaft of the outer rotor to pass through the protective end cover in the basic concept of the present invention, a through hole bearing chamber is formed in the center of the outer rotor side protection end cover, the through hole bearing chamber has a built-in bearing, and the outer rotor solid shaft Fixed at one end of the outer rotor housing through the outer rotor housing, with the through-hole bearing chamber built-in bearing set, and through the through-hole bearing chamber and built-in bearing, out of the outer rotor side protective end cover, the outer rotor solid shaft at the other end It is installed in the shaft of the stator shaft bracket adjacent to the side of the stator protection end cover. The technical solution for setting the shaft fulcrum on the outer rotor side protection end cover can be understood as an external bearing scheme. External rotor with external bearing solution DC brushless motor is especially suitable for heavy-duty motors.

As a fourth technical solution for realizing the outer shaft of the outer rotor to pass through the protective end cover in the basic concept of the present invention, there is only a through hole in the center of the protective cover of the stator, and only a bearing chamber in the center of the outer end of the outer end of the protective cover, and a bearing is built in the bearing chamber. The outer rotor solid shaft is fixed at one end of the outer rotor casing through the outer rotor casing, and is inserted into the bearing of the outer rotor side protection end cover bearing chamber, and the other end of the outer rotor solid shaft is mounted on the stator shaft bracket adjacent to the stator protection end cover One side A central through hole extending through the bearing and the stator protection end cover adjacent to the stator protection end cover extends out of the stator protection end cover. This technical solution belongs to the bearing external solution. The outer rotor solid shaft passes through the end of the stator protection end cover and has a power output position conversion, which is also particularly suitable for heavy-duty electric motors.

As an implementation of the basic idea of the present invention, it can solve the problem that the internal stator wire exit line and the power lead of the external rotor DC brushless motor of the prior art are both an installation and use incompatibility problem from the side of the motor. In the casing, there is an outlet, the stator winding line and the DC electric control board are out of the line, passing through the outlet of the casing, and connected to the external power supply. The technical solution for the outlet from the casing is compatible with most of the conventional inner rotors. The way the motor is wired and how it is installed.

As a basic concept of the present invention, a heat-dissipating technical solution for improving the heat dissipation effect of the key electronic components of the DC-controlled circuit board of the external rotor DC brushless motor and improving the effective power and working life of the external rotor DC brushless motor can be improved. The outer shaft of the outer rotor is provided with a fan blade on the shaft body passing through the outer side of the outer end cover of the outer rotor or a shaft on the shaft body passing through the protective cover of the stator, and a protective cover is arranged on the outer side of the fan blade, and the protective cover is provided with a vent. During operation, the fan blades can draw cool air from the vents, forcibly blowing cool air to the key electronic components of the DC control board.

As a basic scheme of the present invention, another forced air cooling technology solution capable of improving the heat dissipation effect of key electronic components of a DC electronic circuit board is provided with a DC electronic circuit board box, a casing and a DC electronic circuit board on the outside of the casing. There is an outlet port between the boxes, the DC electric control circuit board box system has an outlet port, the DC electric control circuit board is placed in the DC electric control circuit board box body, and the DC electric control circuit board box body is dissipated in the key electronic components of the corresponding DC electric control circuit board. There is an air-cooling chamber on one side of the board, a venting port is formed in the air-cooling room, and an electric fan is installed in the air-cooling room. During operation, the electric fan can suck in the cool air from the vent, and forcibly blow the cool air to the key electronic components. On the board. As another improvement of the DC electric control circuit board and the air-cooling room heat dissipation technology on the outside of the casing, the air-cooling room is not equipped with an electric fan, and the fan blade is installed in the outer shaft of the outer rotor, and the fan is installed in the air-cooling room and the fan. The protective end cover of the leaf is provided with a blasting port between the blast chambers, and the air-cooling chamber side wall is provided with a venting port. During operation, the fan blade can blow the cool air through the blasting port to the key electronic component heat dissipating surface of the air-cooling chamber. on.

As a basic idea of implementing the present invention, it is possible to solve the technical problem that the prior art must fix the fixing limitation of the fixed base frame on one side of the stator protection end cover, and the casing is provided with a similar machine foot and a hanging ear. The fixed component or the fixed end cover of the outer rotor side is provided with a fixing member like a through-hole mounting bracket and a base frame, thereby being compatible with all the mounting orientations and fixing modes of all the inner rotor motors.

As an improvement of the first technical solution for realizing the outer shaft of the outer rotor to pass through the protective end cover, in the first technical solution, the inner side of the outer rotor side protection end cover is provided with a protective pad 圏, which can To protect against dust and moisture, better protect the operating life of the rotor, stator and circuit board inside the casing; as another improvement of the above first technical solution, the outer rotor side protection end in the above first technical solution The center of the through hole of the cover is concentrically formed with a bearing chamber, the bearing chamber has a built-in bearing, and an elastic bearing sleeve is arranged between the bearing chamber and the bearing, which can also play a protective role.

Since the outer rotor DC brushless motor has a casing added to the prior art, the outer rotor side protects the end cover, and the outer rotor solid shaft extends beyond the protective end cover of either end or both ends, and the outer shaft of the outer rotor is exposed. The power output transmits the fixed structure, and thus Like the inner rotor motor, the rotor shaft is either end or both ends as the power output transmission member, so that the size and orientation of the power output transmission member and the conventional inner rotor motor cannot be completely completed. Compatible for the promotion and application of obstacles, and the use of the outer rotor side protection end cover to set a shaft as an external fulcrum shaft ^ external technical solution, greatly improving the load capacity and smooth running of the outer rotor DC brushless motor, overcoming the present In the technology, the weak point of the low overall load of the motor formed by the built-in technical solution of the bearing can be promoted and applied in the heavy-duty motor. In addition, since the casing and the outer rotor side protection end cover are added in the technology of the present invention, the overall product integrity and safety of the outer rotor DC brushless motor as an independent power output unit are improved on the one hand; The outer rotor DC brushless motor can have more flexible installation options and more flexible structure options in the direction of the power lead outlet and the mounting direction of the base and the specific fixing structure. The technical external rotor DC brushless motor can only be used on the side of the stator protection end cover. It can be used in all kinds of industrial machinery and equipment, automobiles, ships, home appliances, etc. And the solid shaft body of the outer rotor between the protective cover and the protective end cover is provided with a built-in forced air cooling solution of the fan blade, or a DC electronic circuit board box with an electric fan air cooling chamber is arranged in the casing The external forced air supply cooling technology solution effectively solves the key electric power in the DC control circuit board of the outer rotor DC brushless motor. The heat dissipation of the sub-component significantly improves the effective power and service life of the outer rotor DC brushless motor, further improving the integrity and reliability of the use as an independent motor product, thus further expanding the outer rotor DC brushless motor. A range of compatible alternative applications in rotor motors in a variety of powers. DRAWINGS

1 is a cross-sectional view showing an embodiment in which two bearings are built in a stator bearing bracket as a built-in fulcrum, and the outer ends of the outer rotor solid shaft are passed out of the protective end cover;

Figure 2 is a view showing the overall appearance of the embodiment of Figure 1;

3 is a cross-sectional view showing an embodiment in which two bearings are built in a stator bearing bracket as a built-in fulcrum, and one end of the outer rotor solid shaft passes out of the outer rotor side protective end cover; FIG. 4 is an overall view of the embodiment of FIG. Appearance diagram;

Figure 5 is a cross-sectional view showing an embodiment in which the bearing for protecting the end cover on the outer rotor side is an external fulcrum, and one end of the solid inner shaft of the outer rotor passes through the outer rotor side protective end cover;

Figure 6 is a view showing the overall appearance of the embodiment of Figure 5;

Figure 7 is a cross-sectional view showing an embodiment in which the bearing for protecting the end cover on the outer rotor side is an external fulcrum, and one end of the solid inner shaft of the outer rotor passes through the outer protective cover of the stator;

Figure 8 is a view showing the overall appearance of the embodiment of Figure 7;

Figure 9 is a cross-sectional view showing an embodiment of a strong-discharge air-dissipating scheme in which an air-cooling chamber with an electric fan is provided on a casing;

Figure 10 is a view showing the overall appearance of the embodiment of Figure 9;

Figure 11 is a cross-sectional view showing an embodiment of a strong exhaust air dissipating scheme in which a fan blade is placed on a solid shaft of an outer rotor in the present invention;

Figure 12 is a view showing the overall appearance of the embodiment of Figure 11; detailed description

The invention is further illustrated by the following examples and the accompanying drawings:

In the embodiment of FIGS. 1 and 2, the outer rotor DC brushless motor includes a stator coil assembly 5, a stator bearing bracket 11, a bearing 10, 16 mounted on the stator bearing bracket 11, and a stator protection end cover 6, An outer rotor assembly consisting of an outer rotor casing 3, a permanent magnet 4, and an outer rotor solid shaft 8, a DC electric control circuit board 12, and an outer rotor solid shaft 8 end is fixed in two bearings 10, 16 in the stator bearing bracket The casing 2 is fixed on the edge of the stator protection end cover 6, and the outer rotor side protection end cover 1 is disposed at the other end of the casing 2, and the outer rotor side protection end cover 1 is provided with a through hole 15 at the center, and the outer rotor solid shaft 8 is fixed. At the outer rotor housing 3 end, the outer rotor housing 3 and the outer rotor side protective end cover 1 central through hole 15 are passed through, and the outer rotor side protective end cover 1 is pierced, and is exposed outside the outer rotor protective end cover 1 The outer rotor solid shaft 8 which can be connected with other members to form a power output has a groove 14 formed on the shaft body; a through hole 9 is formed in the center of the stator protection end cover 6, and the outer rotor solid shaft 8 is adjacent to the stator protection end cover 6 end The stator protects the end cover 6 from the central through hole 9 and passes through the stator Outside the end cover 6, an outer rotor solid shaft 8 which is exposed outside the stator protection end cover 6 and which can be connected to other members to form a power output is formed with a groove 7 on the shaft body, and a pad 13 is disposed on the outer rotor side protection end cover 1 A fixing member 17 is formed on the surface of the casing 2, and a wire outlet hole 18 is formed in the stator protection end cover 6. This embodiment can be adapted to a ventilation device (such as an air curtain machine and a blower) that requires coaxial double-end power output. Used in).

In the embodiment of FIGS. 3 and 4, the outer rotor DC brushless motor includes a stator coil assembly 28, a stator bearing bracket 27, and bearings 24, 29 mounted in the stator bearing bracket. The stator protection end cover 38 is composed of an outer rotor housing 20, a permanent magnet 21, an outer rotor solid shaft 30, an outer rotor assembly 23, a direct current control circuit board 23, and an outer rotor solid shaft 30-end fixed in the stator bearing bracket. In the two bearings 24, 29, a casing 37 is fixed on the edge of the stator protection end cover 38, and an outer rotor side protection end cover 36 is disposed at the other end of the casing 37, and a through hole 33 is formed in the center of the outer rotor side protection end cover 36. A shaft chamber 35 is concentrically formed on the circumference of the through hole 33. The bearing chamber 35 has a bearing 32 built therein. A rubber bearing sleeve 31 is disposed between the bearing chamber 35 and the bearing 32. The outer rotor solid shaft 30 is fixed to the outer rotor housing 20-end. Through the outer rotor housing 20, the bearing 32 and the through hole 33 are pierced, and the outer rotor side protective end cover 36 is passed out. The outer exposed solid shaft 30 is axially formed with a recess 34, and the stator protects the end cover 38. The key component of the DC electronic circuit board is coated with thermal silica gel, which also serves as the key component heat sink 22 of the DC electronic circuit board. The outer rotor solid shaft 30 is provided with a fan blade 26 on the shaft body passing through the outer side of the stator protection end cover 38. The outer side of the leaf 26 is provided with a protective cover 19, and the protective cover 19 is provided with a vent 25, which is secured on the outer rotor side. The end cap 36 is provided with a fixing member 39 with a fixed through hole 40, and the housing 37 is provided with an outlet 41. This embodiment is particularly suitable for the same side of the rotor shaft power output end in the automobile, aircraft, and chemical industries. Installation and power outlets are promoted in the motor at the other end.

In the embodiment of FIG. 5 and FIG. 6, the outer rotor DC brushless motor comprises a stator coil assembly 51, a stator bearing bracket 45, a bearing 46 mounted in the stator bearing bracket, a stator protection end cover 50, and an outer rotor shell. The outer rotor assembly consisting of the body 58, the permanent magnet 42 and the outer rotor solid shaft 56, the DC electric control circuit board 44 is fixed on the inner side of the stator protection end cover 50, and the interface 59 is fixed at the edge of the stator protection end cover 50, and the casing 59 is manufactured. There is an outlet 60, and an outgoing line (not shown) of the DC control board 44 passes through the outlet 60 and is connected to an external power supply. An outer rotor side protective end cover 57 is disposed at the other end of the casing 59, and a through hole bearing chamber 53 is formed in the center of the outer rotor side protective end cover 57. The through hole bearing chamber 53 has a bearing 54 built therein, and the outer rotor solid shaft 56 is fixedly mounted. The rotor housing 58-end is fitted through the outer rotor housing 58 and the through-hole bearing chamber 53 built-in bearing 54, and passes through the through-hole bearing chamber 53 built-in bearing 54, and passes out of the outer rotor-side protective end cover 57, and is exposed outside. The outer rotor solid shaft 56 has a groove 55 formed on the shaft body, and the stator protection end cover 50 is closely attached to the key component of the DC electric control circuit board, and is coated with a thermal conductive silica gel, which also serves as a key component heat sink plate 43 of the DC electric control circuit board, and the other end of the outer rotor solid shaft 46 Mounted in the bearing 46 of the stator bearing bracket 45 near the side of the stator protection end cover 50, the outer rotor solid shaft 56 is provided with a fan blade 48 on the shaft body passing outside the stator protection end cover 50, and is protected outside the fan blade 48. The cover 49, the protective cover 49 is provided with a vent 47, and the fixed foot 52 is disposed at the bottom of the casing 59. This embodiment is suitable for popularization and application in a general-purpose machine requiring floor-standing installation.

In the embodiment of FIGS. 7 and 8, the outer rotor DC brushless motor includes a stator coil assembly 71, a stator bearing bracket 67, a bearing 66 mounted in the fixed bearing bracket, a stator protection end cover 63, and an outer rotor housing. The outer rotor assembly consisting of the body 69, the permanent magnet 68 and the outer rotor solid shaft 72, the casing 62 is fixed at the edge of the stator protection end cover 63, and the outer rotor side protection end cover 78 is disposed at the other end of the casing 62, and the outer rotor side The protective end cap 78 is centrally provided with a through hole shaft chamber 76. The through hole shaft chamber 76 has a shaft 7|74 built therein, and the outer rotor solid shaft 72 is fixed to the outer rotor housing 69-end through the outer rotor housing 69, and is inserted outside. The rotor side protection end cover 78 is disposed in the bearing 74 of the through hole bearing chamber 76 and extends through the outer side of the outer rotor side protection end cover 78, and the fan body 73 is disposed on the shaft body passing through the outer rotor side protection end cover 78. The outer side of the fan blade 73 is provided with a protective cover 77, and the protective cover 77 is provided with a vent 75, and the outer side of the casing 62 is provided The DC electric control circuit board box 84 and the DC electric control circuit board 83 are placed in the DC electric control circuit board box 84. The outlet 62 is formed between the casing 62 and the DC electric control circuit board box 84, and the stator winding assembly 71 is out. (not shown) is connected to the DC electric control circuit board 83 through the outlet 61, the DC control circuit board casing 84 is provided with an outlet 85, and the DC electric control board 83 power supply lead (not shown) passes through the outlet 85 and the outside. The power supply is connected, the DC control circuit board box 84 corresponds to the DC power control circuit board. The key electronic component heat dissipation board 82 has an air cooling chamber 81, an air cooling chamber 81 and an outer rotor protection end cover 78 with a fan blade 73. A blast port 80 is disposed between the outer blast chambers 79, a vent 86 is formed on the side wall of the air-cooling chamber 81, and the other end of the outer rotor solid shaft 72 is mounted on the bearing 66 of the stator shaft bracket 67 near the stator protection end cover 63. And extending through the central through hole 65 of the bearing 66 and the stator protection end cover 63, and extending out of the stator protection end cover 63, the externally exposed outer rotor solid shaft 72 is formed with a groove 64 on the shaft body, and is disposed at the bottom of the casing 62. There are fixed machine feet 70, this embodiment is especially suitable for heavy burden The motor application.

The present invention can also design another external rotor DC brushless motor with an external independent forced air supply technical solution structure according to another embodiment. Referring to FIG. 9 and FIG. 10, a DC electronic control circuit board box is arranged outside the casing 93. The body 88, the DC control circuit board 89 is placed in the DC electronic circuit board box 88, and the outlet 93 is formed between the casing 93 and the DC control circuit board box 88, and the stator winding assembly 94 is out of line (not shown). The DC control circuit board box 88 is provided with an outlet 96, and the DC power control board 89 power lead (not shown) is connected to the external power supply through the outlet 96, the machine is connected to the DC power control circuit board 89. The shell 93 and the DC electric control circuit board box 88 correspond to the DC electric control circuit board 89. The key electronic component heat sink 90 has an air cooling chamber 95 on the lower side thereof, and the air cooling chamber 95 has a vent opening. 97. The air-cooling chamber 95 is equipped with an electric fan 91. During operation, the electric fan 91 can suck the cool air from the vent 97, and is forcibly blown to the surface of the key electronic component heat sink 90, and the key electronic component heat sink 90 is The accumulated tropical belt is taken away from the vent (not shown) at the other end of the air-cooling chamber 95. This embodiment is particularly suitable for popularization and application in a speed regulating motor with a speed regulation ratio and a heavy load.

11 and 12 illustrate another embodiment of a built-in heat dissipation scheme for a cooling fan blade and a power output transmission fixed structure device on the same side shaft of the stator protection end cover, the outer rotor solid shaft 104 passing through the stator The protective end cover 99 is provided with a fan blade 105 on the shaft body, and a protective cover 100 with a vent 101 is disposed outside the fan blade 105. The protective cover 100 has a through hole 102 formed therein, and the outer rotor solid shaft 104 extends through the protective cover 100. The through hole 102, outside the outer through hole 102 can be connected with other members to form a power output of the outer rotor solid shaft 104 shaft body, a groove 103 is formed, the casing 98 is provided with a wire outlet 106.

Of course, in the present invention, the power output transmission fixing structure formed on the solid shaft of the outer rotor is not limited to the groove type of the above embodiment, and pin keys, anti-thread threads, threading pins, positioning holes, flat blocks, etc. may be used. The motor shaft power output transmission type is such that the conversion is within the protection scope of the present invention.

Claims

1. An outer rotor DC brushless motor, comprising a stator coil assembly, a stator bearing bracket, a bearing mounted in the stator bearing bracket, a stator protection end cover, an outer rotor shell, a permanent magnet, and an outer rotor solid shaft The outer rotor assembly and the DC electric control circuit board are formed, and one end of the solid shaft of the outer rotor is fixed in the shaft of the stator shaft bracket, and the utility model is characterized in that: the shell is fixed on the edge of the stator protection end cover, and the other end of the casing is disposed The outer rotor side protects the end cap.

2. The outer rotor brushless DC motor according to claim 1, wherein: the outer rotor side protection end cover has a through hole at the center, and the outer rotor solid shaft is fixed at one end of the outer rotor housing through the outer rotor. The housing and the outer rotor side protect the central through hole of the end cover and pass out of the outer rotor side protection end cover.

The outer rotor brushless DC motor according to claim 1, wherein: the outer rotor side protection end cover has a through hole bearing chamber in the center, the through hole bearing chamber has a built-in bearing, and the outer rotor solid shaft solid The outer rotor housing is mounted at one end of the outer rotor housing through the outer rotor housing, and the through-hole bearing chamber has a built-in bearing assembly, and passes through the through-hole bearing chamber and the built-in bearing, and passes out of the outer rotor-side protective end cover.

The outer rotor brushless DC motor according to claim 1, wherein: the outer rotor side protection end cover has a bearing chamber in the center, the bearing chamber has a built-in bearing, and the outer rotor solid shaft is fixed on the outer rotor shell. One end of the body passes through the outer rotor casing, and is inserted into the shaft of the outer rotor side protection end cover shaft chamber, and the other end of the outer rotor solid shaft is mounted on the shaft of the stator shaft bracket adjacent to the side of the stator protection end cover, and extends A central through hole that passes through the side of the stator protection end cover ₇ | and the stator protection end cover passes outside the stator protection end cover.

5. The outer rotor brushless DC motor according to claim 1, wherein: said casing has an outlet.

The outer rotor DC brushless motor according to claim 1, wherein: the outer rotor solid shaft is provided with a fan blade on a shaft body passing through the outer rotor side protection end cover, outside the fan blade It is equipped with a protective cover and the protective cover has a vent.

7. The outer rotor brushless DC motor according to claim 1, wherein: said outer rotor solid shaft is provided with a fan blade on a shaft body passing through the outer side of the stator protection end cover, and is mounted on the outer side of the fan blade. The protective cover has a vent.

8. The outer rotor DC brushless motor according to claim 1, wherein: the outer casing of the casing is provided with a DC electric control circuit board box body, and the casing and the DC electric control circuit board box are formed. The outlet port, the DC electric control circuit board box system has an outlet port, and the DC electric control circuit board box has an air cooling chamber on the side of the key electronic component heat dissipation board corresponding to the DC electric control circuit board, and the air cooling chamber has a venting port, and the air cooling room is installed. There is an electric fan.

9. The outer rotor DC brushless motor according to claim 1, 5, 6, and 7, wherein: the outer casing is provided with a DC electronically controlled circuit board box, the casing and the DC electronically controlled circuit board box. There is an outlet port between them, the DC electric control circuit board box system has an outlet port, and the DC electric control circuit board box body corresponds to the DC electronic control circuit board. The key electronic components of the heat dissipation plate are provided with an air cooling chamber, the air cooling chamber and the fan blade. A blasting port is arranged between the outer blast chambers of the protective end cover, and a venting opening is formed on the side wall of the air cooling chamber.

10. An outer rotor brushless DC motor according to claims 6, 7 and 9, wherein: said outer rotor solid shaft extends out of the protective cover.

11. An outer rotor brushless DC motor according to claim 1 wherein: The casing is provided with a fixed member.

The outer rotor brushless DC motor according to claim 1, wherein said outer rotor side protective end cover is provided with a fixing member.

The outer rotor brushless DC motor according to claim 2, wherein a spacer is disposed inside the center through hole of the outer rotor side protection end cover.

The outer rotor brushless DC motor according to claim 2, wherein: a bearing chamber is concentrically formed on a circumference of the central through hole of the outer rotor side protection end cover, and the bearing chamber has a bearing, a bearing chamber and a bearing. An elastic bearing sleeve is placed between them.