CN215646467U

CN215646467U - Outer rotor brushless direct current motor

Info

Publication number: CN215646467U
Application number: CN202122014291.8U
Authority: CN
Inventors: 郭峰; 牛勇; 张鹏
Original assignee: Guangdong Xinren Technology Co ltd
Current assignee: Guangdong Xinren Technology Co ltd
Priority date: 2021-08-25
Filing date: 2021-08-25
Publication date: 2022-01-25
Anticipated expiration: 2031-08-25

Abstract

The utility model relates to an outer rotor brushless DC motor, comprising: the assembling seat comprises a bottom plate and a first limiting part, the first limiting part is arranged on the bottom plate, and a first mounting groove is formed in the first limiting part; the stator assembly is sleeved outside the first limiting part of the assembling seat through the first mounting through hole; the rotor assembly is arranged outside the stator assembly and comprises a rotor body and a second limiting part, the second limiting part is arranged on the rotor body, and the second limiting part is provided with a plug hole; the bearing assembly is arranged in the first mounting groove of the first limiting part; one end of the rotating shaft penetrates through the bearing assembly to be connected with the side wall of the inserting hole of the rotor assembly, and the other end of the rotating shaft is connected with the driving device; the circuit board is sleeved outside the first limiting part of the assembling seat through the second mounting through hole on the circuit board. The outer rotor brushless direct current motor provided by the utility model has the advantages of high assembly precision, good production stability, high assembly efficiency and low cost.

Description

Outer rotor brushless direct current motor

Technical Field

The utility model relates to the technical field of motors, in particular to an outer rotor brushless direct current motor.

Background

The outer rotor brushless direct current motor consists of a motor main body and a driver, is an electromechanical integrated product, has good rotation inertia and static speed regulation performance, and has the advantages of compact structure, reliable operation, easy control and the like.

The existing outer rotor brushless direct current motor structure is generally complex in mold manufacturing process, poor in manufacturing reliability, low in machining precision, easy to produce assembly errors, low in assembly efficiency and not beneficial to automatic production.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a brushless dc motor with high assembly accuracy, long service life of the mold, good production stability, high assembly efficiency, low cost, and suitability for mass production, aiming at the problems of low assembly accuracy, complex mold manufacturing process, poor production stability, and low assembly efficiency of the existing brushless dc motor.

An outer rotor brushless dc motor comprising: the assembling seat comprises a bottom plate and a first limiting part, wherein the first limiting part is arranged on the bottom plate, and is provided with a first mounting groove; the stator assembly is provided with a first mounting through hole, and the stator assembly is sleeved outside the first limiting part of the assembling seat through the first mounting through hole; the rotor assembly is arranged outside the stator assembly and comprises a rotor body and a second limiting part, the second limiting part is arranged on the rotor body, and a plug hole is formed in the second limiting part; the bearing assembly is arranged in the first mounting groove of the first limiting part; one end of the rotating shaft penetrates through the bearing assembly to be connected with the side wall of the inserting hole of the rotor assembly, and the other end of the rotating shaft is connected with a driving device; the circuit board is provided with a second mounting through hole, and the circuit board is sleeved outside the first limiting part of the assembling seat through the second mounting through hole.

The utility model provides an outer rotor brushless DC motor, bearing assembly and stator module set up respectively in the inside and outside both sides of the first spacing portion of assembly seat, and the rotor subassembly sets up outside stator module, and outside the first spacing portion of assembly seat was located through the second installation through-hole cover on it to the circuit board to make stator module and rotor subassembly set up on the circuit board. The stator assembly, the rotor assembly, the bearing assembly and the circuit board are connected and assembled into the outer rotor brushless direct current motor through the rotating shaft. When the circuit board is electrified, the stator assembly connected to the circuit board generates a rotating magnetic field, and the rotor assembly supported by the bearing assembly is cut by magnetic lines of force in the rotating magnetic field to generate output current.

Specifically, in the brushless direct current motor of outer rotor in this application, stator module locates the first spacing portion outside of assembly seat through the first installation through-hole cover on it, realizes the location of stator module on the assembly seat. The bearing assembly sets up in the first mounting groove of the first spacing portion of assembly seat to realize the location of bearing assembly on the assembly seat, stator module's outside is located to the rotor subassembly cover. The circuit board is provided with a second mounting through hole, and the second mounting through hole is used for sleeving the circuit board outside the first limiting part of the assembling seat. One end of the rotating shaft penetrates through the bearing assembly to be connected with the side wall of the inserting hole of the rotor assembly, and the other end of the rotating shaft is connected with the driving device. In conclusion, the outer rotor brushless direct current motor can be rapidly assembled through the implementation mode, in addition, the motor assembling mode mainly realizes rapid and accurate positioning of all parts through the structure of the assembling seat, the structure is simple, the assembling difficulty is low, and the assembling can be completed without an external complex mounting tool, so that the assembling efficiency of the brushless direct current motor can be effectively improved.

In one embodiment, a positioning convex rib is arranged on the peripheral side wall of the first limiting part, a positioning groove matched with the positioning convex rib is arranged on the side wall of the first mounting through hole of the stator assembly, and the stator assembly and the first limiting part are connected with the positioning convex rib in a clamping manner through the positioning groove.

Among the foretell outer rotor brushless DC motor, stator module is through setting up positioning groove on the lateral wall at first installation through-hole, and set up the protruding muscle of location with positioning groove looks adaptation on the first spacing portion periphery lateral wall of assembly seat, in order to realize that stator module and the location of the first spacing portion of assembly seat are connected, moreover, the steam generator is simple in structure and reliable, can prevent effectively that stator module from taking place to shift and influencing the block with the rotor subassembly at the high-speed in-process of running of motor relatively assembly seat, and produce great noise, or increase the condition of friction and wearing and tearing between the part, influence the life-span of each part of motor.

Preferably, be equipped with a plurality of location convex ribs in the first spacing portion, a plurality of location convex ribs evenly set up along the periphery lateral wall of first spacing portion. The stator component is provided with a plurality of positioning grooves matched with the positioning convex ribs. The structure can further improve the position fixation of the stator assembly in the assembling seat and improve the running reliability of the motor.

In one embodiment, the first limiting part comprises a first boss and a second boss, the second boss is connected with the base plate, the first boss is connected with the second boss, the first boss is provided with the positioning convex rib and a first mounting groove, the second boss is provided with a second mounting groove, and the second mounting groove is communicated with the first mounting groove; the bearing assembly includes a first bearing and a second bearing, the first bearing and the second bearing being disposed in the first mounting groove and the second mounting groove, respectively.

In the outer rotor brushless direct current motor, the first limiting part comprises the first boss and the second boss, the first boss and the second boss are both arranged in the same side direction of the base plate, and the second boss is respectively connected with the first boss and the base plate. The bearing assembly includes a first bearing and a second bearing. Wherein, be equipped with location protruding muscle and first mounting groove on the first boss for the location of stator module and first bearing. The second boss is provided with a second mounting groove for mounting and positioning of a second bearing.

In the structure, the bearing assembly comprises two bearings, friction can be reduced by arranging the two bearings, so that the motor can rotate stably, the two bearings are arranged in the same side direction of the assembly seat, the structure of the motor is more compact, and the structural space of the outer rotor brushless direct current motor is saved.

Optionally, one of the bearings of the bearing assembly is a ball bearing and the other is a ball bearing.

In one embodiment, the first limiting part comprises a first boss and a second boss, the first boss and the second boss are oppositely arranged on two sides of the base plate, the first boss is provided with the positioning convex rib and a first mounting groove, the second boss is provided with a second mounting groove, and the second mounting groove is communicated with the first mounting groove; the bearing assembly includes a first bearing and a second bearing, the first bearing and the second bearing being disposed in the first mounting groove and the second mounting groove, respectively.

In the outer rotor brushless direct current motor, the first limiting part comprises the first boss and the second boss, the first boss and the second boss are oppositely arranged in the directions of two sides of the base plate, and the second boss is respectively connected with the first boss and the base plate. The bearing assembly includes a first bearing and a second bearing. Wherein, be equipped with location protruding muscle and first mounting groove on the first boss for the location of stator module and first bearing. The second boss is provided with a second mounting groove for mounting and positioning of a second bearing.

In the structure, the bearing assembly comprises two bearings which are arranged oppositely on two sides of the base plate respectively, friction of each part of the motor is reduced, the motor rotates more stably, and the running stability of the outer rotor brushless direct current motor is improved.

The outer rotor brushless direct current motor in one embodiment further comprises at least one gasket, wherein the at least one gasket is arranged in the first mounting groove and/or the second mounting groove and abuts against the first bearing and/or the second bearing.

In the outer rotor brushless direct current motor, the upper gasket is arranged between the first bearing and/or the second bearing and the groove wall of the first mounting groove and/or the second mounting groove. Through set up the packing ring on bearing assembly, can effectively offset the tolerance between each part during the motor assembly, convenient assembly improves efficiency, practices thrift the cost.

In one embodiment, a limiting boss is arranged on the groove wall of the first mounting groove and/or the second mounting groove, and the limiting boss can abut against the bearing assembly.

According to the outer rotor brushless direct current motor, the groove wall of the first mounting groove and/or the groove wall of the second mounting groove are/is provided with the limiting bosses, and the limiting bosses can be abutted to the bearing assembly, so that the bearing assembly is better positioned in the mounting groove.

In one embodiment, the assembly seat further comprises at least three supporting blocks, the circuit board is provided with a limiting groove matched with the supporting blocks, and the circuit board and the assembly seat are detachably connected through the limiting groove and the supporting blocks.

The assembly seat of the outer rotor brushless direct current motor further comprises at least three supporting blocks, the supporting blocks are used for supporting the circuit board arranged on the assembly seat, and the circuit board is provided with limiting grooves matched with the supporting blocks and used for positioning the circuit board. The assembly mode can effectively isolate the assembly seat from the circuit board and prevent the assembly seat from interfering the working performance of the circuit board. Therefore, the structure can further improve the operation reliability of the outer rotor brushless direct current motor.

In one embodiment, the support block comprises a support seat body and at least two protrusions spaced apart on the support seat body.

In the above brushless dc motor with an outer rotor, the support block further includes a support body and at least two protrusions. Through set up two at least bellyings at the interval on the supporting seat body, can improve the assembly frictional force between spacing groove and the supporting shoe, consequently can be better with the circuit board block on the supporting shoe. The circuit board is prevented from falling off from the supporting block of the assembling seat when the motor runs at high speed.

In one embodiment, the supporting block comprises a supporting seat body, a first protruding portion and a second protruding portion, the first protruding portion and the second protruding portion are arranged on the supporting seat body at intervals, the first protruding portion and the second protruding portion are bent outwards to form a bent portion, and the bent portion is matched with the limiting groove.

In the outer rotor brushless direct current motor, the supporting block comprises the supporting body, the first protruding part and the second protruding part. First bellying and second bellying interval set up on the supporting seat body, and first bellying and second bellying form the bending part to the outside lateral buckling, can further improve the ability of grabbing of riveting between spacing groove and the supporting shoe, and assembly frictional force further improves, and the spacing groove is more firm with the tight-fitting effect of supporting shoe, can be better with the circuit board block on the supporting shoe. The circuit board is prevented from falling off from the supporting block of the assembling seat when the motor runs at high speed.

In one embodiment, the circuit board is provided with a power supply interface.

The circuit board is provided with the power supply interface, so that the power supply is directly connected with the circuit board, the complexity of circuit assembly can be reduced, the electromagnetic interference of the rotor assembly and the stator assembly on the circuit board is avoided, and the structural reliability of the outer rotor brushless direct current motor is improved.

In one embodiment, the stator assembly comprises a stator body, wherein a circumferential surface of the outer circumference of the stator body is uniformly provided with a plurality of tooth parts, and tooth grooves are formed between the adjacent tooth parts.

Foretell brushless DC motor of outer rotor, stator module include stator body, evenly set up a tooth portion and a tooth socket on stator body's the periphery, under the prerequisite of guaranteeing not increase the magnetic leakage, through the width that reduces the tooth socket notch, and then realize reducing the vibration of motor in the operation process and the purpose of electromagnetic noise.

Drawings

Fig. 1 is a schematic view of an overall structure of an outer rotor brushless dc motor according to the present invention;

fig. 2 is a view of the assembled outer rotor brushless dc motor of the present invention;

fig. 3 is a schematic structural diagram of an outer rotor brushless dc motor according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of the assembly base according to an embodiment of the outer rotor brushless dc motor of the present invention;

fig. 5 is a second schematic structural view of the assembly base according to an embodiment of the outer rotor brushless dc motor of the present invention;

fig. 6 is a schematic structural diagram of the mounting base according to another embodiment of the outer rotor brushless dc motor of the present invention;

fig. 7 is a sectional view of an assembly base of the outer rotor brushless dc motor according to the present invention;

fig. 8 is a schematic structural diagram of a stator assembly of the outer rotor brushless dc motor according to the present invention;

fig. 9 is a schematic structural diagram of a circuit board of the outer rotor brushless dc motor according to the present invention;

fig. 10 is a schematic structural diagram of a rotor assembly of an outer rotor brushless dc motor according to the present invention.

Wherein, the corresponding relation between the reference signs and the component names is as follows:

1. the mounting base comprises a mounting base body, 11, a bottom plate, 12, a first limiting part, 121, a first boss, 122, a second boss, 13, a positioning convex rib, 101, a first mounting groove, 102, a second mounting groove, 14, a supporting block, 141, a supporting base body, 142, a convex part, 1421, a first convex part, 1422, a second convex part and 15 limiting bosses;

2. the stator assembly comprises a stator assembly 201, a first mounting through hole 202, a positioning groove 21, a stator body 211, a tooth part 203 and a tooth groove;

3. the rotor assembly comprises a rotor assembly 31, a second limiting part 301, a plug hole 32 and a rotor body;

4. bearing assembly, 41 first bearing, 42 second bearing;

5. a rotating shaft;

6. the circuit board 601, the second mounting through hole 602, the limiting groove 603 and the power supply interface;

7. a gasket.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the utility model will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

An outer rotor brushless dc motor according to some embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in fig. 1 to 10, the present embodiment discloses an outer rotor brushless dc motor, including: the assembling seat 1 comprises a bottom plate 11 and a first limiting part 12, wherein the first limiting part 12 is arranged on the bottom plate 11, and the first limiting part 12 is provided with a first mounting groove 101; the stator assembly 2 is provided with a first mounting through hole 201, and the stator assembly 2 is sleeved outside the first limiting part 12 of the assembling seat 1 through the first mounting through hole 201; the rotor assembly 3 is arranged outside the stator assembly 2, the rotor assembly 3 comprises a rotor body 32 and a second limiting part 31, the second limiting part 31 is arranged on the rotor body 32, and the second limiting part 31 is provided with a plug hole 301; the bearing assembly 4, the bearing assembly 4 is set up in the first mounting groove 101 of the first spacing part 12; one end of the rotating shaft 5 penetrates through the bearing assembly 4 to be connected with the side wall of the inserting hole 301 of the rotor assembly 3, and the other end of the rotating shaft 5 is connected with a driving device; the circuit board 6, the circuit board 6 is provided with a second mounting through hole 601, and the circuit board 6 is sleeved outside the first limiting portion 12 of the assembling base 1 through the second mounting through hole 601.

The utility model provides an outer rotor brushless DC motor, bearing subassembly 4 and stator module 2 set up respectively in the inside and outside both sides of the first spacing portion 12 of assembly seat 1, and rotor module 3 sets up outside stator module 2, and outside the first spacing portion 12 of assembly seat 1 was located to the circuit board through the second mounting hole 601 cover on it to make stator module 2 and rotor module 3 set up on the circuit board. The stator assembly 2, the rotor assembly 3, the bearing assembly 4 and the circuit board are connected and assembled into an outer rotor brushless direct current motor through a rotating shaft 5. When the circuit board is electrified, the stator assembly 2 connected to the circuit board generates a rotating magnetic field, and the rotor assembly 3 supported by the bearing assembly 4 is cut by magnetic lines of force in the rotating magnetic field to generate output current.

Specifically, in the outer rotor brushless dc motor in this application, stator module 2 locates the first spacing portion 12 outside of assembly seat 1 through the first installation through-hole 201 cover on it, realizes stator module 2 location on assembly seat 1. The bearing assembly 4 is arranged in the first mounting groove 101 of the first limiting part 12 of the mounting seat 1, so that the positioning of the bearing assembly 4 on the mounting seat 1 is realized, and the rotor assembly 3 is sleeved outside the stator assembly 2. The circuit board is provided with a second mounting through hole 601, and the second mounting through hole 601 is used for sleeving the circuit board outside the first limiting portion 12 of the assembling base 1. One end of the rotating shaft 5 passes through the bearing assembly 4 to be connected with the side wall of the insertion hole 301 of the rotor assembly 3, and the other end is connected with the driving device. In conclusion, the outer rotor brushless direct current motor can be rapidly assembled through the embodiment, in addition, the motor assembling mode mainly realizes rapid and accurate positioning of all parts through the structure of the assembling seat 1, the structure is simple, the assembling difficulty is low, and the assembling can be completed without an external complex mounting tool, so that the assembling efficiency of the brushless direct current motor can be effectively improved.

As shown in fig. 4 and 8, in addition to the features of the above embodiment, the present embodiment further defines: be equipped with location convex rib 13 on the periphery lateral wall of first spacing portion 12, be equipped with on the lateral wall of stator module 2's first mounting hole 201 with the positioning groove 202 of location convex rib 13 looks adaptation, stator module 2 is connected through positioning groove 202 and location convex rib 13 block with first spacing portion 12.

In the external rotor brushless direct current motor, the stator assembly 2 is provided with the positioning groove 202 on the side wall of the first mounting through hole 201, and the positioning convex rib 13 matched with the positioning groove 202 is arranged on the peripheral side wall of the first limiting part 12 of the assembly seat 1, so that the positioning connection between the stator assembly 2 and the first limiting part 12 of the assembly seat 1 is realized, the structure is simple and reliable, the situation that the stator assembly 2 is displaced relative to the assembly seat 1 in the high-speed operation process of the motor to influence the clamping with the rotor assembly 3 can be effectively prevented, and larger noise is generated, or the friction and abrasion among components are increased, and the service life of each component of the motor is influenced.

Preferably, a plurality of positioning ribs 13 are arranged on the first limiting portion 12, and the plurality of positioning ribs 13 are uniformly arranged along the peripheral side wall of the first limiting portion 12. The stator assembly 2 is provided with a plurality of positioning grooves 202 matched with the positioning convex ribs 13. The structure can further improve the position fixation of the stator assembly 2 in the assembly seat 1 and improve the operation reliability of the motor.

As shown in fig. 1, 4, 5 and 7, further, in this embodiment, the first position-limiting portion 12 includes a first boss 121 and a second boss 122, the second boss 122 is connected to the bottom plate 11, the first boss 121 is connected to the second boss 122, the first boss 121 is provided with a positioning convex rib 13 and a first mounting groove 101, the second boss 122 is provided with a second mounting groove 102, and the second mounting groove 102 is communicated with the first mounting groove 101; the bearing assembly 4 includes a first bearing 41 and a second bearing 42, and the first bearing 41 and the second bearing 42 are respectively disposed in the first mounting groove 101 and the second mounting groove 102.

In the outer rotor brushless dc motor, the first limiting portion 12 includes the first boss 121 and the second boss 122, the first boss 121 and the second boss 122 are both disposed on the same side of the bottom plate 11, and the second boss 122 is connected to the first boss 121 and the bottom plate 11 respectively. The bearing assembly 4 includes a first bearing 41 and a second bearing 42. The first boss 121 is provided with a positioning rib 13 and a first mounting groove 122 for positioning the stator assembly 2 and the first bearing 41. The second boss 122 is provided with a second mounting groove 102 for mounting and positioning the second bearing 42.

In the structure, the bearing assembly 4 comprises two bearings, friction can be reduced by arranging the two bearings, so that the motor can rotate stably, the two bearings are arranged in the same side direction of the assembly seat 1, the structure of the motor is more compact, and the structural space of the outer rotor brushless direct current motor is saved.

In this embodiment, the first position-limiting portion 12 includes a first boss 121 and a second boss 122, the first boss 121 and the second boss 122 are disposed on two sides of the bottom plate 11, the first boss 121 is provided with a positioning convex rib 13 and a first mounting groove 101, the second boss 122 is provided with a second mounting groove 102, and the second mounting groove 102 is communicated with the first mounting groove 101; the bearing assembly 4 includes a first bearing 41 and a second bearing 42, and the first bearing 41 and the second bearing 42 are respectively disposed in the first mounting groove 101 and the second mounting groove 102.

In the outer rotor brushless dc motor, the first limiting portion 12 includes a first boss 121 and a second boss 122, the first boss 121 and the second boss 122 are oppositely disposed on two sides of the bottom plate 11, and the second boss 122 is respectively connected to the first boss 121 and the bottom plate 11. The bearing assembly 4 includes a first bearing 41 and a second bearing 42. The first boss 121 is provided with a positioning rib 13 and a first mounting groove 122 for positioning the stator assembly 2 and the first bearing 41. The second boss 122 is provided with a second mounting groove 102 for mounting and positioning the second bearing 42.

In the structure, the bearing assembly 4 comprises two bearings which are arranged oppositely on two sides of the bottom plate 11, friction of each part of the motor is reduced, the motor rotates more stably, and the running stability of the outer rotor brushless direct current motor is improved.

As shown in fig. 1, the outer rotor brushless dc motor in this embodiment further includes at least one washer 7, and the at least one washer 7 is disposed in the first mounting groove 101 and/or the second mounting groove 102 and abuts against the first bearing 41 and/or the second bearing 42.

In the above-described outer rotor brushless dc motor, the upper washer 7 is disposed between the first bearing 41 and/or the second bearing 42 and the groove wall of the first mounting groove 101 and/or the second mounting groove 102. Through set up packing ring 7 on bearing assembly 4, can effectively offset the tolerance between each part during the motor assembly, convenient assembly improves efficiency, practices thrift the cost.

As shown in fig. 6 and 7, in the present embodiment, a limiting boss 15 is disposed on a groove wall of the first mounting groove 101 and/or the second mounting groove 102, and the limiting boss 15 can abut against the bearing assembly 4.

In the outer rotor brushless direct current motor, the groove wall of the first mounting groove 101 and/or the second mounting groove 102 is provided with the limiting boss 15, and the limiting boss 15 can abut against the bearing assembly 4, so that the bearing assembly 4 is better positioned in the mounting groove 101.

As shown in fig. 4, 5 and 9, in the present embodiment, the assembly base 1 further includes at least three supporting blocks 14, the circuit board 6 is provided with a limiting groove 602 adapted to the supporting blocks 14, and the circuit board 6 and the assembly base 1 are detachably connected through the limiting groove 602 and the supporting blocks 14.

In the outer rotor brushless dc motor, the assembly base 1 further includes at least three supporting blocks 14, the supporting blocks 14 are used for supporting the circuit board 6 disposed on the assembly base 1, and the circuit board 6 is provided with a limiting groove 602 adapted to the supporting blocks 14 for positioning the circuit board 6. By the assembly mode, the assembly seat 1 can be effectively isolated from the circuit board 6, and the interference of the assembly seat 1 on the working performance of the circuit board 6 is prevented. Therefore, the structure can further improve the operation reliability of the outer rotor brushless direct current motor.

As shown in fig. 4, in the present embodiment, the supporting block 14 includes a supporting seat body 141 and at least two protrusions 142, and the at least two protrusions 142 are spaced apart from each other on the supporting seat body 141.

In the above brushless dc motor with outer rotor, the supporting block 14 further includes a supporting body 141 and at least two protrusions 142. By providing at least two protrusions 142 on the supporting seat body 141 at intervals, the assembling friction between the limiting groove 602 and the supporting block 14 can be increased, and thus the circuit board can be better clamped on the supporting block 14. The circuit board is prevented from falling off the supporting block 14 of the assembly base 1 when the motor runs at high speed.

As shown in fig. 6, in the present embodiment, the supporting block 14 includes a supporting seat body 141, a first protrusion 1421 and a second protrusion 1422, the first protrusion 1421 and the second protrusion 1422 are disposed on the supporting seat body 141 at intervals, the first protrusion 1421 and the second protrusion 1422 are bent outward to form a bending portion, and the bending portion is adapted to the limiting groove 602.

In the outer rotor brushless dc motor, the supporting block 14 includes a supporting body 141, a first protrusion 1421 and a second protrusion 1422. First bellying 1421 and second bellying 1422 set up at the interval on supporting seat body 141, and first bellying 1421 and second bellying 1422 form the bending part to the outside bending, can further improve the riveting ability between spacing groove 602 and the supporting shoe 14, and assembly friction further improves, and spacing groove 602 is more firm with the tight fit effect of supporting shoe 14, can better block circuit board 6 on supporting shoe 14. The circuit board is prevented from falling off the supporting block 14 of the assembly base 1 when the motor runs at high speed.

As shown in fig. 2 and 9, in the present embodiment, the circuit board 6 is provided with a power jack 603.

The circuit board 6 is provided with the power socket 603, so that the power is directly connected with the circuit board 6, the complexity of circuit assembly can be reduced, the electromagnetic interference of the rotor assembly 3 and the stator assembly 2 on the circuit board is avoided, and the structural reliability of the outer rotor brushless direct current motor is improved.

As shown in fig. 8, in the present embodiment, the stator assembly 2 includes a

stator body

21, 12 tooth portions 211 are uniformly provided on the circumferential surface of the outer circumference of the stator body 21, and tooth slots 203 are provided between adjacent tooth portions 211.

Foretell outer rotor brushless DC motor, stator module 2 include stator body 21, evenly set up 12

tooth portions

211 and 12 tooth grooves 203 on stator body 21's the periphery, under the prerequisite of guaranteeing not to increase the magnetic leakage, through the width that reduces the tooth groove notch, and then realize reducing the purpose of motor vibration and electromagnetic noise in the operation process.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An outer rotor brushless DC motor, comprising:

the assembling seat (1) comprises a bottom plate (11) and a first limiting part (12), the first limiting part (12) is arranged on the bottom plate (11), and the first limiting part (12) is provided with a first mounting groove (101);

the stator assembly (2) is provided with a first mounting through hole (201), and the stator assembly (2) is sleeved outside the first limiting part (12) of the assembling seat (1) through the first mounting through hole (201);

the rotor assembly (3) is arranged outside the stator assembly (2), the rotor assembly (3) comprises a rotor body (32) and a second limiting part (31), the second limiting part (31) is arranged on the rotor body (32), and the second limiting part (31) is provided with an inserting hole (301);

a bearing assembly (4), the bearing assembly (4) being disposed within the first mounting groove (101) of the first limiting portion (12);

one end of the rotating shaft (5) penetrates through the bearing assembly (4) to be connected with the side wall of the inserting hole (301) of the rotor assembly (3), and the other end of the rotating shaft (5) is connected with a driving device;

the circuit board (6), be equipped with second mounting through hole (601) on circuit board (6), circuit board (6) pass through second mounting through hole (601) cover is located outside first spacing portion (12) of assembly seat (1).

2. The external rotor brushless DC motor according to claim 1, wherein a positioning rib (13) is disposed on a peripheral sidewall of the first position-limiting portion (12), a positioning groove (202) adapted to the positioning rib (13) is disposed on a sidewall of the first mounting through hole (201) of the stator assembly (2), and the stator assembly (2) and the first position-limiting portion (12) are connected by the positioning groove (202) and the positioning rib (13) in a clamping manner.

3. The external rotor brushless DC motor of claim 2, wherein the first position-limiting portion (12) comprises a first boss (121) and a second boss (122), the second boss (122) is connected with the base plate (11), the first boss (121) is connected with the second boss (122), the first boss (121) is provided with the positioning convex rib (13) and a first mounting groove (101), the second boss (122) is provided with a second mounting groove (102), and the second mounting groove (102) is communicated with the first mounting groove (101);

the bearing assembly (4) includes a first bearing (41) and a second bearing (42), the first bearing (41) and the second bearing (42) being disposed in the first mounting groove (101) and the second mounting groove (102), respectively.

4. The external rotor brushless DC motor of claim 2, wherein the first limiting portion (12) comprises a first boss (121) and a second boss (122), the first boss (121) and the second boss (122) are oppositely arranged on two sides of the base plate (11), the first boss (121) is provided with the positioning convex rib (13) and a first mounting groove (101), the second boss (122) is provided with a second mounting groove (102), and the second mounting groove (102) is communicated with the first mounting groove (101);

5. The external rotor brushless DC motor according to claim 3 or 4, further comprising at least one washer (7), wherein the at least one washer (7) is disposed in the first mounting groove (101) and/or the second mounting groove (102) and abuts against the first bearing (41) and/or the second bearing (42); and/or

And a limiting boss (15) is arranged on the groove wall of the first mounting groove (101) and/or the second mounting groove (102), and the limiting boss (15) can be abutted against the bearing assembly (4).

6. The external rotor brushless DC motor according to claim 1, wherein the assembly base (1) further comprises at least three support blocks (14), the circuit board (6) is provided with a limit groove (602) adapted to the support blocks (14), and the circuit board (6) and the assembly base (1) are detachably connected through the limit groove (602) and the support blocks (14).

7. The external rotor brushless DC motor of claim 6, wherein the support block (14) comprises a support seat body (141) and at least three protrusions (142), the at least three protrusions (142) being spaced apart on the support seat body (141).

8. The external rotor brushless DC motor of claim 6, wherein the support block (14) comprises a support body (141), a first protrusion (1421) and a second protrusion (1422), the first protrusion (1421) and the second protrusion (1422) are spaced apart from each other on the support body (141), the first protrusion (1421) and the second protrusion (1422) are bent outward to form a bending portion, and the bending portion is adapted to the limit groove (602).

9. The external rotor brushless dc motor of claim 1, wherein the circuit board (6) is provided with a power socket (603).

10. The external rotor brushless DC motor of claim 1, wherein the stator assembly (2) comprises a stator body (21), 12 tooth parts (211) are uniformly arranged on the circumferential surface of the outer circumference of the stator body (21), and tooth slots (203) are arranged between adjacent tooth parts (211).