CN217741534U

CN217741534U - External rotor motor

Info

Publication number: CN217741534U
Application number: CN202221255831.XU
Authority: CN
Inventors: 郭烈维; 黄廷帅; 王鸿彬; 林炎虎
Original assignee: Hubei Queen Ocean Electrical Appliance Manufacture Co Ltd
Current assignee: Hubei Queen Ocean Electrical Appliance Manufacture Co Ltd
Priority date: 2022-05-24
Filing date: 2022-05-24
Publication date: 2022-11-04
Anticipated expiration: 2032-05-24

Abstract

The utility model discloses an external rotor electric machine, including motor monomer and controller, the motor monomer includes stator module, external rotor and cover barrel seat, stator module includes end insulation and coil winding, be equipped with binding post on the end insulation, binding post is connected with the coil winding electricity, the cover barrel seat includes end plate and first sleeve, stator module overlaps outside first sleeve, be provided with a plurality of terminal hole on the end plate, the insulating sealed pad that is equipped with on the end plate, the position that corresponds every terminal hole on the insulating sealed pad is provided with first through-hole, the apron is used for the insulating sealed pad of closing cap, the position that corresponds every first through-hole on the apron is provided with the second through-hole, binding post passes the terminal hole, be connected with the controller electricity behind first through-hole and the second through-hole, still be provided with a plurality of insulating terminal covers on the end insulation, insulating terminal cover locates the binding post outside, binding post's tip is worn out in insulating terminal cover, the tip of insulating terminal cover inlays the dress in insulating sealed pad or supports on the bottom surface of apron.

Description

External rotor motor

The technical field is as follows:

the utility model relates to an external rotor electric machine.

The background art comprises the following steps:

the existing external rotor motor comprises a motor and a controller, the motor comprises a rotating shaft, a stator assembly, an outer rotor and a sleeve seat, the stator assembly comprises a stator core, an end insulator and a coil winding, a plurality of wiring terminals are installed on the end insulator, the wiring terminals are electrically connected with the coil winding, the sleeve seat comprises an end plate and a sleeve protruding upwards from the middle of the end plate, bearing chambers are formed in two ends of the sleeve, bearings are installed in the bearing chambers, the rotating shaft is located in the sleeve, two ends of the rotating shaft are supported on the bearings respectively, the outer rotor comprises a casing sleeve and a plurality of permanent magnets installed on the inner wall surface of the casing sleeve, one end of the rotating shaft extends out of the sleeve and is connected with the casing sleeve in an installing mode, the stator assembly is installed outside the sleeve in a nested mode, and the outer rotor sleeve is located outside the stator assembly.

In order to solve the above problems, the existing external transmission motor is improved and optimized for the structure thereof, and the specific scheme is as follows: dig out the recess on the bottom surface of end plate, a plurality of terminal holes are located the recess and set up on the bottom surface of recess, install insulating sealing pad in the recess, the position protrusion that corresponds every terminal hole on the insulating sealing pad has the flange, the flange nestification is in terminal hole the inside, be provided with the through-hole on the flange, binding post's middle part passes the through-hole, binding post's tip stretches out from insulating sealing pad's through-hole and is connected with the circuit board electricity of controller, there is the apron through the bolted mounting at the opening part of recess, the apron is fixed insulating sealing pad in the recess, can guarantee under the condition that motor and controller electricity directly connect through adopting insulating sealing pad, realize the inside isolated with the controller of motor, it is sealed effectual, the inside protectiveness of motor and controller has been improved, and it is insulating effectual.

However, the above scheme has the following disadvantages: 1) Because the wiring terminal needs to extend into the controller, the whole length of the wiring terminal can be designed to be longer in design, and because the wiring terminal is longer and the whole thickness is thinner, the wiring terminal is easy to deform in the assembling process to cause the deviation of the wiring terminal, so that the wiring terminal is not well matched with the insulating sealing gasket, and the hidden danger of water leakage exists; 2) The sleeve seat of the existing outer rotor motor is generally made of aluminum metal, the insulating sealing gasket in the scheme can only realize the isolation between the inside of the motor and the inside of the controller, and the wiring terminal and the sleeve seat in the motor have no insulating effect.

The invention content is as follows:

the utility model aims at providing a binding post non-deformable squints, the uniformity is good, and the product security is high, the leakproofness is good, the external rotor electric machine that the reliability is high.

The purpose of the utility model is realized by the following technical scheme.

The utility model aims at providing an external rotor electric machine, include:

the motor single body comprises a stator assembly, an outer rotor and a sleeve seat, wherein the outer rotor and the sleeve seat are sleeved outside the stator assembly, the stator assembly comprises a stator core, an end insulation and a coil winding, a plurality of wiring terminals are arranged on the end insulation, the wiring terminals are electrically connected with the coil winding, the sleeve seat comprises an end plate and a first sleeve arranged in the middle of the end plate, the stator assembly is sleeved outside the first sleeve, a plurality of terminal holes are formed in the end plate, an insulation sealing gasket is arranged on the end plate, a first through hole is formed in the position, corresponding to each terminal hole, on the insulation sealing gasket, a cover plate is further arranged on the end plate and used for sealing the insulation sealing gasket, and a second through hole is formed in the position, corresponding to each first through hole, on the cover plate;

the controller is arranged on the end plate, and the wiring terminal penetrates through the terminal hole, the first through hole and the second through hole and then is electrically connected with a circuit board in the controller;

the end part insulation is also provided with a plurality of insulation terminal sleeves, the insulation terminal sleeves are sleeved outside the wiring terminals, the end parts of the wiring terminals penetrate through the insulation terminal sleeves, and the end parts of the insulation terminal sleeves are embedded in the insulation sealing gaskets or abut against the bottom surface of the cover plate.

Preferably, the top surface of the insulating sealing gasket corresponds to each first through hole, and a flange is arranged at the position of the first through hole and embedded in the second through hole, a boss is arranged at the position of the bottom surface of the insulating sealing gasket corresponding to each first through hole and extends into the terminal hole, the boss is provided with a mounting groove communicated with the first through hole, and the end part of the insulating terminal sleeve is embedded in the mounting groove.

Preferably, the width W1 of the insulative terminal bushing is gradually reduced from a lower portion of the insulative terminal bushing toward an upper portion of the insulative terminal bushing.

Preferably, the insulating terminal cover is provided with the confession the third through-hole that binding post passed, and the third through-hole includes the guide section and corrects the section, binding post gets into through the guide section and corrects the section, then wears out from correcting the section, and the aperture width W2 of guide section reduces from the open end of guide section towards correcting the section gradually.

Preferably, two adjacent insulating terminal sleeves are connected through a connecting plate to form a fixing bracket.

Preferably, the bottom of the connecting plate is provided with a positioning column, the end part of the connecting plate is provided with a positioning hole matched with the positioning column in an insulating way, the positioning column is inserted into the positioning hole, and the fixed support is supported on the top surface of the end part of the connecting plate in an insulating way.

Preferably, the insulating terminal sleeve is supported on the top surface of the end portion insulation, the insulating terminal sleeve is a silica gel sleeve, and the end portion of the insulating terminal sleeve passes through the terminal hole and the first through hole and then abuts against the bottom surface of the cover plate.

Preferably, a second sleeve is arranged on the bottom surface of the cover plate corresponding to each second through hole, and the second sleeve penetrates through the terminal hole and is sleeved outside the insulating terminal sleeve.

Preferably, the lower part of the connecting terminal is provided with a folded part, and the bottom of the insulating terminal sleeve is provided with a clearance groove for accommodating the folded part.

Preferably, the outer rotor further comprises a rotating shaft, bearing chambers are arranged at two ends of the first sleeve, bearings are installed in the bearing chambers, and the rotating shaft is located in the first sleeve and supported on the bearings; the outer rotor comprises a casing sleeve and a plurality of permanent magnets arranged on the inner wall surface of the casing sleeve, one end of the rotating shaft extends out of the first sleeve to be connected with the casing sleeve, a flange extends out of an opening of the casing sleeve, and a wind wheel is arranged on the flange.

Compared with the prior art, the utility model, following effect has:

1) The utility model provides an external rotor electric machine, establish insulating terminal cover through the cover outside binding post, adopt insulating terminal cover can play a reinforcing action to binding post, avoid binding post in the assembling process of motor because take place deformation skew and lead to shortening the electric clearance between the terminal hole of binding post and cover barrel seat, can ensure binding post's uniformity, non-deformable ensures that the motor has sufficient electrical strength, make the stability in use of motor high, and can also ensure that binding post and insulating sealed pad cooperate well, in order to improve the leakproofness of motor.

2) The utility model provides an external rotor electric machine establishes the insulation that the insulating terminal cover can realize between binding post and the cover barrel holder at binding post outside cover to optimize the insulating effect between binding post and the cover barrel holder better, the motor has sufficient electrical strength, effectively improves the stability in use and the security of motor, makes the quality of motor more reliable.

3) The utility model provides an external rotor electric machine inlays the tip through with insulating terminal cover and inlays and adorn in insulating sealing pad or support on the bottom surface of apron, can further improve the leakproofness between a plurality of terminal holes on binding post and the end plate to improve the quality of product.

4) Other advantages of the present invention will be described in detail in the examples section.

Description of the drawings:

fig. 1 is a schematic perspective view of an external rotor motor provided by the present invention;

fig. 2 is an exploded schematic view of a motor unit according to an embodiment of the present invention;

FIG. 3 is an enlarged schematic view of portion A provided for FIG. 2;

fig. 4 is a schematic top view of a motor unit according to an embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view B-B provided in FIG. 4;

FIG. 6 is an enlarged schematic view of section C provided for FIG. 5;

fig. 7 is a schematic perspective view of a fixing bracket according to an embodiment of the present invention;

fig. 8 is a schematic view of an internal structure of an insulating terminal sleeve according to an embodiment of the present invention;

fig. 9 is an exploded schematic view of a motor unit according to a second embodiment of the present invention;

fig. 10 is an enlarged structural view of a portion D provided for fig. 9;

fig. 11 is a schematic top view of a motor unit according to a second embodiment of the present invention;

FIG. 12 is a schematic cross-sectional view of E-E provided for FIG. 11;

fig. 13 is an enlarged structural view of a portion F provided for fig. 12.

The specific implementation mode is as follows:

the present invention will be described in further detail with reference to the following detailed description of preferred embodiments and accompanying drawings.

The first embodiment is as follows:

as shown in fig. 1 to 8, the present embodiment provides an external rotor motor, which includes a motor unit 100 and a controller 200, wherein the controller 200 is used to control the motor unit 100 to operate; the motor unit 100 comprises a rotating shaft 8, a stator assembly 1, an outer rotor 2 sleeved outside the stator assembly 1 and a sleeve seat 3, wherein the stator assembly 1 comprises a stator core 11, end insulators 12 and coil windings 13, the end insulators 12 are respectively arranged at two ends of the stator core 11 and then are wound on the coil windings 13, the end insulators 12 are provided with a plurality of wiring terminals 14, the wiring terminals 14 are electrically connected with the coil windings 13, the sleeve seat 3 comprises an end plate 31 and a first sleeve 32 arranged in the middle of the end plate 31, the stator assembly 1 is sleeved outside the first sleeve 32, two ends of the first sleeve 32 are provided with bearing chambers 321, bearings are arranged in the bearing chambers 321, the rotating shaft 8 is positioned in the first sleeve 32 and supported on the bearings, the outer rotor 2 comprises a casing sleeve 21 and a plurality of permanent magnets 22 arranged on the inner wall surface of the casing sleeve 21, one end of a rotating shaft 8 extends out of a first sleeve 32 to be connected with the casing sleeve 21, a flange 10 extends out of an opening of the casing sleeve 21, a wind wheel 20 is arranged on the flange 10, a groove 310 is arranged on an end plate 31, a plurality of terminal holes 311 through which wiring terminals 14 penetrate are arranged on the bottom surface of the groove 310, an insulating sealing gasket 4 is arranged in the groove 310, first through holes 41 through which the wiring terminals 14 penetrate are arranged at positions, corresponding to the terminal holes 311, on the insulating sealing gasket 4, a cover plate 5 is arranged at the opening of the groove 310 through screws 30 and used for sealing the insulating sealing gasket 4, and second through holes 51 through which the wiring terminals 14 penetrate are arranged at positions, corresponding to the first through holes 41, on the cover plate 5; the controller 200 comprises a housing and a circuit board (not shown) installed in the housing, the housing is installed on the end plate 31, the wiring terminal 14 penetrates through the terminal hole 311, the first through hole 41 and the second through hole 51 and then is electrically connected with the circuit board inside the controller 200, the end insulator 12 is further provided with a plurality of insulating terminal sleeves 6, the insulating terminal sleeves 6 are sleeved outside the wiring terminal 14, the end of the wiring terminal 14 penetrates through the insulating terminal sleeves 6, and the end of the insulating terminal sleeves 6 is embedded in the insulating sealing gasket 4.

The insulating terminal sleeve 6 is sleeved outside the wiring terminal 14, the insulating terminal sleeve 6 can play a role in reinforcing the wiring terminal 14, the phenomenon that the electric gap between the wiring terminal 14 and the terminal hole 311 of the sleeve seat 3 is shortened due to deformation and deflection of the wiring terminal 14 in the assembly process of the motor is avoided, the consistency of the wiring terminal 14 can be ensured, the motor has enough electric strength, the use stability of the motor is high, the good matching of the wiring terminal 14 and the insulating sealing gasket 4 can be ensured, the sealing performance of the motor is improved, the insulation between the wiring terminal 14 and the sleeve seat 3 can be realized by sleeving the insulating terminal sleeve 6 outside the wiring terminal 14, the insulation effect between the wiring terminal 14 and the sleeve seat 3 is better optimized, the motor has enough electric strength, the use stability and the safety of the motor are effectively improved, and the quality of the motor is more reliable; in addition, the end of the insulating terminal cover 6 is fitted into the insulating gasket 4, so that the sealing performance between the terminal 14 and the plurality of terminal holes 311 of the end plate 31 can be further improved, thereby improving the quality of the product.

As shown in fig. 1, the top surface of the insulating sealing gasket 4 is provided with a flange 42 corresponding to each position of the first through hole 41, the flange 42 is embedded in the second through hole 51, the bottom surface of the insulating sealing gasket 4 is provided with a boss 43 corresponding to each position of the first through hole 41, the boss 43 extends into the terminal hole 311, the boss 43 is provided with a mounting groove 45 communicated with the first through hole 41, the end of the insulating terminal sleeve 6 is embedded in the mounting groove 45, the width W1 of the insulating terminal sleeve 6 gradually decreases from the lower part of the insulating terminal sleeve 6 to the upper part of the insulating terminal sleeve 6, and the sealing performance between the terminal 14 and the terminal holes 311 on the end plate 31 can be further improved through the cooperation mode of gradually extruding the inclined surface, so that the quality of the product is improved, and the installation is convenient and quick.

As shown in fig. 8, the insulating terminal housing 6 is provided with a third through hole 61 through which the connection terminal 14 passes, the third through hole 61 includes a guide section 611 and a correction section 612, the connection terminal 14 enters the correction section 612 through the guide section 611 and then passes out of the correction section 612, and the aperture width W2 of the guide section 611 gradually decreases from the open end of the guide section 611 toward the correction section 612, so that the design is reasonable, and even if the connection terminal 14 deforms during the assembly of the motor, the connection terminal 14 can be ensured to enter the third through hole 61, and the connection terminal 14 has a good correction effect.

As shown in fig. 7, two adjacent insulating terminal sleeves 6 are connected by a connecting plate 7 to form a fixing bracket 300, and a plurality of insulating terminal sleeves 6 are connected by the connecting plate 7, so that the insulating terminal sleeves 6 have better integrity and higher structural strength.

As shown in fig. 7, the bottom of the connecting plate 7 is provided with a positioning column 71, the end insulator 12 is provided with a positioning hole 121 matched with the positioning column 71, the positioning column 71 is inserted into the positioning hole 121, and the fixing bracket 300 is supported on the top surface of the end insulator 12, so that quick positioning and installation can be realized, and the fixing bracket 300 can be installed more stably.

The second embodiment:

as shown in fig. 1 and 9 to 13, the present embodiment provides an external rotor motor, which includes a motor unit 100 and a controller 200, where the controller 200 is used to control the motor unit 100 to operate; the motor unit 100 comprises a rotating shaft 8, a stator assembly 1, an outer rotor 2 sleeved outside the stator assembly 1 and a sleeve seat 3, wherein the stator assembly 1 comprises a stator core 11, end insulators 12 and coil windings 13, the end insulators 12 are respectively arranged at two ends of the stator core 11 and then are wound on the coil windings 13, the end insulators 12 are provided with a plurality of wiring terminals 14, the wiring terminals 14 are electrically connected with the coil windings 13, the sleeve seat 3 comprises an end plate 31 and a first sleeve 32 arranged in the middle of the end plate 31, the stator assembly 1 is sleeved outside the first sleeve 32, two ends of the first sleeve 32 are provided with bearing chambers 321, bearings are arranged in the bearing chambers 321, the rotating shaft 8 is positioned in the first sleeve 32 and supported on the bearings, the outer rotor 2 comprises a casing sleeve 21 and a plurality of permanent magnets 22 arranged on the inner wall surface of the casing sleeve 21, one end of a rotating shaft 8 extends out of a first sleeve 32 to be connected with the casing sleeve 21, a flange 10 extends out of an opening of the casing sleeve 21, a wind wheel 20 is arranged on the flange 10, a groove 310 is arranged on an end plate 31, a plurality of terminal holes 311 through which wiring terminals 14 penetrate are arranged on the bottom surface of the groove 310, an insulating sealing gasket 4 is arranged in the groove 310, first through holes 41 through which the wiring terminals 14 penetrate are arranged at positions, corresponding to the terminal holes 311, on the insulating sealing gasket 4, a cover plate 5 is arranged at the opening of the groove 310 through screws 30 and used for sealing the insulating sealing gasket 4, and second through holes 51 through which the wiring terminals 14 penetrate are arranged at positions, corresponding to the first through holes 41, on the cover plate 5; the controller 200 comprises a shell and a circuit board installed in the shell, the shell is installed on the end plate 31, the wiring terminal 14 penetrates through the terminal hole 311, the first through hole 41 and the second through hole 51 and then is electrically connected with the circuit board of the controller 200, a plurality of insulating terminal sleeves 6 are further arranged on the end insulation 12, the insulating terminal sleeves 6 are sleeved outside the wiring terminal 14, the end portion of the wiring terminal 14 penetrates through the insulating terminal sleeves 6, and the end portion of the insulating terminal sleeves 6 abuts against the bottom surface of the cover plate 5.

The insulating terminal sleeve 6 is sleeved outside the wiring terminal 14, the insulating terminal sleeve 6 can play a role in reinforcing the wiring terminal 14, the phenomenon that the electric gap between the wiring terminal 14 and the terminal hole 311 of the sleeve seat 3 is shortened due to deformation and deflection of the wiring terminal 14 in the assembly process of the motor is avoided, the consistency of the wiring terminal 14 can be ensured, the motor has enough electric strength, the use stability of the motor is high, the good matching of the wiring terminal 14 and the insulating sealing gasket 4 can be ensured, the sealing performance of the motor is improved, the insulating between the wiring terminal 14 and the sleeve seat 3 can be realized by sleeving the insulating terminal sleeve 6 outside the wiring terminal 14, the insulating effect between the wiring terminal 14 and the sleeve seat 3 is better optimized, the motor has enough electric strength, the use stability and the safety of the motor are effectively improved, and the quality of the motor is more reliable; in addition, the end of the insulating terminal sleeve 6 is abutted against the bottom surface of the cover plate 5, so that the sealing performance between the terminal 14 and the terminal holes 311 of the end plate 31 can be further improved, and the quality of the product can be improved.

As shown in fig. 13, the insulating terminal sleeve 6 is supported on the top surface of the end insulator 12, the insulating terminal sleeve 6 is a silica gel sleeve, the end of the insulating terminal sleeve 6 passes through the terminal hole 311 and the first through hole 41 and then abuts against the bottom surface of the cover plate 5, the structure is simple, and the insulating terminal sleeve 6 is directly pressed through the cover plate 5, so that the installation is convenient, and the sealing performance of each insulating terminal sleeve 6 can be ensured.

As shown in fig. 13, a second sleeve 52 is disposed on the bottom surface of the cover plate 5 corresponding to each second through hole 51, and the second sleeve 52 penetrates through the terminal hole 311 and is sleeved outside the insulating terminal sleeve 6, so as to further optimize the insulating effect between the terminal 14 and the sleeve base 3, improve the insulation property inside the motor unit 100, and thus improve the use stability and safety of the motor, and make the quality of the motor more reliable.

As shown in fig. 10 and 13, the lower portion of the terminal 14 is provided with a folded portion 141, and the bottom of the insulating terminal sleeve 6 is provided with a clearance groove 62 for accommodating the folded portion 141, so that the design is reasonable, and the insulating protection between the terminal 14 and the sleeve base 3 is ensured.

The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited thereto, and any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention are equivalent replacement modes, and are all included in the scope of the present invention.

Claims

1. An external rotor electric machine comprising:

the motor single body (100) comprises a stator assembly (1), an outer rotor (2) and a sleeve seat (3), wherein the outer rotor (2) and the sleeve seat (3) are sleeved outside the stator assembly (1), the stator assembly (1) comprises a stator iron core (11), an end insulator (12) and a coil winding (13), a plurality of wiring terminals (14) are arranged on the end insulator (12), the wiring terminals (14) are electrically connected with the coil winding (13), the sleeve seat (3) comprises an end plate (31) and a first sleeve (32) arranged in the middle of the end plate (31), the stator assembly (1) is sleeved outside the first sleeve (32), a plurality of terminal holes (311) are formed in the end plate (31), an insulating sealing gasket (4) is arranged on the end plate (31), first through holes (41) are formed in the insulating sealing gasket (4) corresponding to the positions of the terminal holes (311), a cover plate (5) is further arranged on the end plate (31), the cover plate (5) is used for sealing the insulating sealing gasket (4), and second through holes (51) are formed in the cover plate (5) corresponding to the positions of the first through holes (41);

the controller (200) is installed on the end plate (31), and the wiring terminal (14) penetrates through the terminal hole (311), the first through hole (41) and the second through hole (51) and then is electrically connected with a circuit board in the controller (200);

the method is characterized in that: the end part insulator (12) is also provided with a plurality of insulating terminal sleeves (6), the insulating terminal sleeves (6) are sleeved outside the wiring terminals (14), the end parts of the wiring terminals (14) penetrate through the insulating terminal sleeves (6), and the end parts of the insulating terminal sleeves (6) are embedded in the insulating sealing gaskets (4) or abut against the bottom surface of the cover plate (5).

2. The external rotor electric machine according to claim 1, wherein: the top surface (40) of insulating sealing pad (4) correspond every the position of first through-hole (41) is provided with flange (42), and flange (42) inlay and adorn in second through-hole (51), bottom surface (44) of insulating sealing pad (4) correspond every the position of first through-hole (41) is provided with boss (43), and boss (43) stretch into to in terminal hole (311), boss (43) be provided with mounting groove (45) of first through-hole (41) intercommunication, the tip of insulating terminal cover (6) inlays and is adorned in mounting groove (45).

3. An external rotor electric machine as claimed in claim 2, wherein: the width W1 of the insulation terminal sleeve (6) is gradually reduced from the lower part of the insulation terminal sleeve (6) to the upper part of the insulation terminal sleeve (6).

4. The external rotor electric machine according to claim 3, wherein: the insulation terminal sleeve (6) is provided with a third through hole (61) for the connection terminal (14) to pass through, the third through hole (61) comprises a guide section (611) and a correction section (612), the connection terminal (14) enters the correction section (612) through the guide section (611) and then penetrates out of the correction section (612), and the aperture width W2 of the guide section (611) gradually decreases from the opening end of the guide section (611) to the correction section (612).

5. The external rotor electric machine according to claim 4, wherein: two adjacent insulating terminal sleeves (6) are connected through a connecting plate (7) to form a fixing support (300).

6. The external rotor electric machine according to claim 5, wherein: the bottom of the connecting plate (7) is provided with a positioning column (71), the end part insulator (12) is provided with a positioning hole (121) matched with the positioning column (71), the positioning column (71) is inserted into the positioning hole (121), and the fixed support (300) is supported on the top surface of the end part insulator (12).

7. The external rotor electric machine according to claim 1, wherein: the insulating terminal sleeve (6) is supported on the top surface of the end insulating sleeve (12), the insulating terminal sleeve (6) is a silica gel sleeve, and the end part of the insulating terminal sleeve (6) penetrates through the terminal hole (311) and the first through hole (41) and then abuts against the bottom surface of the cover plate (5).

8. The external rotor electric machine according to claim 7, wherein: and a second sleeve (52) is arranged on the bottom surface of the cover plate (5) corresponding to each second through hole (51), and the second sleeve (52) penetrates through the terminal hole (311) and is sleeved outside the insulating terminal sleeve (6).

9. The external rotor electric machine according to claim 8, wherein: the lower part of the wiring terminal (14) is provided with a folded part (141), and the bottom of the insulating terminal sleeve (6) is provided with a clearance groove (62) for accommodating the folded part (141).

10. An external rotor electric machine according to any of claims 1 to 9, wherein: the bearing device is characterized by further comprising a rotating shaft (8), bearing chambers (321) are arranged at two ends of the first sleeve (32), bearings (9) are installed in the bearing chambers (321), and the rotating shaft (8) is located in the first sleeve (32) and supported on the bearings (9); the outer rotor (2) comprises a casing sleeve (21) and a plurality of permanent magnets (22) arranged on the inner wall surface of the casing sleeve (21), one end of the rotating shaft (8) extends out of the first sleeve (32) to be connected with the casing sleeve (21), a flange (10) extends out of an opening of the casing sleeve (21), and a wind wheel (20) is arranged on the flange (10).