A brushless DC motor

Abstract

The present invention discloses a brushless DC motor, comprising a fixedly configured stator assembly; a rotor assembly rotatably configured in the stator assembly; and an electronic control board fixed to the rear of the stator assembly; wherein the stator assembly comprises a stator, an insulating injection mold matched and fixed to the stator, and a winding; a plurality of groove assemblies are configured at the rear of the insulating injection mold; the electronic control board is mounted to the rear of the insulating injection mold via a connector; the rotor assembly comprises a motor shaft and a rotor fixed to the motor shaft; a plurality of first through-slots and second through-slots are provided on the rotor. Based on the above structure, the present application can fix, install, and insulate the stator through the insulating injection mold; the enameled wire drawn from the winding can be confined in the groove assembly; the connector can significantly save installation space within the motor; and the first through-slots and second through-slots can reduce the moment of inertia of the rotor assembly and improve the heat dissipation capacity of the rotor assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of electric motors, and in particular to a brushless DC motor. Background Art

[0002] A brushless DC motor is a motor without brushes or a commutator (or slip ring). It combines the advantages of a traditional DC motor while eliminating the carbon brushes and slip rings. Consequently, it is widely used in automotive, tool, industrial control, automation, and aerospace applications. In existing technologies, the stator in a brushless DC motor is directly fixed to the motor housing and isolated only by insulating paper. This makes it difficult to ensure the stator's stable installation and assembly, making it difficult to disassemble and install, and also makes it difficult to ensure the safe operation of the components within. The windings in a brushless DC motor are directly connected to the circuit board via leads, resulting in a disordered arrangement of leads within the motor housing. This not only causes interference between the multiple leads but can also seriously affect the normal operation of the components. The circuit boards in existing brushless DC motors are all fixed by mounting brackets, resulting in numerous problems such as difficulty optimizing the motor size, a complex internal structure, and inconvenient circuit board assembly and disassembly. Furthermore, the rotors in existing brushless DC motors are all solid structures with a large moment of inertia, which is not conducive to high-dynamic acceleration response. Furthermore, rotors with such structures have poor heat dissipation capabilities. Therefore, it is necessary to design an improved DC brushless motor to address the above problems. Summary of the Invention

[0003] In view of the shortcomings of the above technologies, the present invention provides a brushless DC motor.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] A brushless DC motor comprises: a fixedly arranged stator assembly; a rotor assembly rotatably arranged in the stator assembly; and an electronic control board fixed to the rear of the stator assembly. The stator assembly comprises a stator, an insulating injection mold matched and fixed to the stator, and a winding. The rear of the insulating injection mold is provided with a plurality of groove assemblies for separating a plurality of enameled wires in the winding. The electronic control board is mounted to the rear of the insulating injection mold via a connector. The rotor assembly comprises a motor shaft and a rotor fixed to the motor shaft. The rotor is provided with a plurality of first through slots and second through slots.

[0006] Preferably, the insulating injection mold includes a base mold, on which a plurality of embedding grooves are evenly opened along the circumference; and an iron core sleeve formed on the inner side of the base mold; wherein the iron core sleeve corresponds one-to-one to the embedding grooves; the iron core sleeve includes an iron core sleeve and an iron core sleeve plate; and the iron core sleeve plate is provided with a sink groove communicating with the embedding grooves.

[0007] Preferably, the stator includes a stator sleeve and an iron core body integrally formed on the inner side of the stator sleeve; the iron core body includes an iron core portion, one end of which is connected to the stator sleeve; and an iron core end plate, which is arranged at the other end of the iron core portion; wherein the iron core portion passes through the embedding slot and is inserted into the iron core sleeve one by one; the iron core end plate is fixedly arranged in the sinking groove.

[0008] Preferably, an insulating sleeve is fixed on the stator assembly for isolating the electric control board; wherein the insulating sleeve cover is arranged on the outer periphery of the electric control board, and a plurality of inserts are fixedly arranged on the front end thereof; the inserts are evenly arranged along the circumference of the insulating sleeve.

[0009] Preferably, the plurality of groove components are evenly arranged along the circumference of the insulating injection mold; a wiring gap is arranged between two adjacent groove components; wherein the wiring gap is flared from front to back.

[0010] Preferably, the groove assembly includes a first groove, a second groove, a third groove and a fourth groove sequentially arranged at the rear of the insulating injection mold; wherein the lengths of the first groove, the second groove, the third groove and the fourth groove decrease sequentially.

[0011] Preferably, the connecting member includes a connecting substrate; a first plug-in plate formed in the middle of the front end of the connecting substrate; a second plug-in plate formed in the middle of the front end of the connecting substrate; and two third plug-in plates respectively arranged on both sides of the first plug-in plate; wherein, both sides of the first plug-in plate are formed with first strip-shaped teeth; the side of the third plug-in plate facing away from the first plug-in plate is formed with second strip-shaped teeth; and the side of the third plug-in plate facing the first plug-in plate is formed with a hook plate.

[0012] Preferably, a plurality of plug-in components are formed on the rear portion of the insulating injection mold; the plug-in components are provided with a first slot, a second slot and a third slot; the second slot and the third slot are symmetrically arranged on both sides of the first slot; wherein the first plug-in board is matched and inserted into the first slot; the two third plug-in boards are correspondingly inserted into the second slot and the third slot; a plurality of jacks are provided on the electrical control board, and the second plug-in board is inserted into the jacks.

[0013] Preferably, the first through-slots and the second through-slots are both opened along the axial direction of the motor shaft; the plurality of first through-slots are evenly arranged along the circumferential direction of the rotor; and the second through-slots are evenly arranged between two adjacent first through-slots.

[0014] Preferably, the longitudinal section of the first through groove is square, and the longitudinal section of the second through groove is circular.

[0015] Compared with the prior art, the present invention has the following advantages: the brushless DC motor provided by the present invention can fix, install and insulate the stator through an insulating injection mold, which not only improves the installation stability of the stator and facilitates its disassembly and assembly, but also ensures the safe operation of various components in the motor; the enameled wire led out from the winding can be confined in the groove assembly, so that the direction of the enameled wire is more regular, which not only optimizes the winding space but also improves the insulation capacity between each winding; in the present application, the electronic control board is installed at the rear of the insulating injection mold through a connector, which greatly saves the installation space in the motor and has the advantages of simple and compact structure and easy installation; in addition, a plurality of first through slots and second through slots are provided on the rotor of the present application, which not only reduces the rotational inertia of the rotor assembly, enabling it to accelerate the response with high dynamics, but also improves the heat dissipation capacity of the rotor assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the external structure of the brushless DC motor in the present invention;

[0017] Figure 2 Schematic diagram of the internal structure of the brushless DC motor of the present invention;

[0018] Figure 3 Schematic diagram of the exploded structure of the brushless DC motor of the present invention;

[0019] Figure 4 Schematic diagram of the overall structure of the stator assembly in the present invention;

[0020] Figure 5 This is one of the schematic diagrams of the exploded structure of the stator assembly in the present invention;

[0021] Figure 6 This is the second schematic diagram of the decomposed structure of the stator assembly in the present invention;

[0022] Figure 7 Schematic diagram of the overall structure of the insulating injection mold of the present invention;

[0023] Figure 8 Schematic diagram of the partial structure of the insulation injection mold in the present invention;

[0024] Figure 9 This is one of the structural diagrams of the rotor assembly in the present invention;

[0025] Figure 10 This is the second structural diagram of the rotor assembly in the present invention;

[0026] Figure 11 Schematic diagram of the assembly structure of the rotor and permanent magnet in the present invention;

[0027] Figure 12 This is a schematic diagram of the assembly structure of the insulating sleeve in the present invention;

[0028] Figure 13 This is a schematic diagram of the assembly structure of the electric control board in the present invention;

[0029] Figure 14 This is one of the structural diagrams of the connecting member in the present invention;

[0030] Figure 15 This is the second structural diagram of the connecting member in the present invention;

[0031] Figure 16 It is a schematic diagram of the exploded structure and the assembled structure of the magnetic ring assembly in the present invention. DETAILED DESCRIPTION

[0032] The present invention will be described in further detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0033] like Figure 1 — Figure 16 As shown, the present invention provides a brushless DC motor, comprising:

[0034] The housing 10 has a mounting cavity 100 formed therein;

[0035] A stator assembly 2 fixedly configured in the installation cavity 100;

[0036] Rotating the rotor assembly 3 disposed in the installation cavity 100;

[0037] The electric control board 4 is fixedly arranged in the installation cavity 100;

[0038] A first end cover 11 fixedly disposed at the front end of the housing 10 for closing the front end of the installation cavity 100; and

[0039] The second end cover 12 fixedly arranged at the rear end of the housing 10 is used to close the rear port of the installation cavity 100;

[0040] Specifically, the rotor assembly 3 is rotatably disposed in the stator assembly 2; the electric control board 4 is fixed to the rear of the stator assembly 2 via a connector 9;

[0041] The rotor assembly 3 includes a motor shaft 31 with at least one end extending out of the mounting cavity 100 , a rotor 32 is fixed on the motor shaft 31 , and a plurality of evenly distributed permanent magnets 33 are fixed on the outer circumference of the rotor 32 ;

[0042] The stator assembly 2 includes a plurality of evenly spaced iron cores 212 disposed toward the rotor 32. A winding 23 is wound around each of the iron cores 212. The electrical control board 4 can energize or de-energize the plurality of windings 23 as needed. The energized windings 23 can generate a magnetic field acting on the permanent magnets 33 to drive the rotor assembly 3 to rotate. The number of the iron cores 212 is equal to the number of the permanent magnets 33.

[0043] One end of the motor shaft 31 extends outside the first end cover 11; the first end cover 11 is detachably connected to the housing 10 via a first bolt 131; a first sealing ring 53 is installed between the first end cover 11 and the housing 10; and a first bearing 61 for supporting the motor shaft 31 is disposed in the first end cover 11.

[0044] The second end cover 12 is detachably connected to the housing 10 via a second bolt 132 ; a second sealing ring 54 is installed between the second end cover 12 and the housing 10 ; and a second bearing 62 for supporting the motor shaft 31 is disposed in the second end cover 12 .

[0045] Furthermore, the number of the iron core 212 and the number of the permanent magnets 33 are both limited to six.

[0046] In order to facilitate the installation and fixation of the brushless DC motor, the first end cover 11 is provided with a plurality of first mounting holes 110 , and the second end cover 12 is provided with a plurality of second mounting holes 120 ; wherein the first mounting holes 110 and the second mounting holes 120 are both threaded holes.

[0047] As an embodiment of the present invention, a power line connector (power line connector) 15 and a control circuit connector 14 are respectively fixed to the housing 10; a distance is provided between the power line connector 15 and the control circuit connector 14 to avoid mutual interference between the power line and the control line;

[0048] The power line connector 15 and the control circuit connector 14 are both electrically connected to the electric control board 4; a plurality of terminals 41 are fixed to the electric control board 4; one end of the power line is formed on the power line connector 15, and the other end is connected to the terminals 41 by screws to facilitate disassembly and assembly;

[0049] Specifically, there are three terminals 41 .

[0050] An electric control socket 42 is also fixed on the electric control board 4 ; one end of the control circuit is formed on the control circuit connector 14 , and the other end is formed on the electric control plug 141 ; the electric control plug 141 can be matched and plugged with the electric control socket 42 .

[0051] In a specific application scenario, a first annular groove 312 and a second annular groove 313 are provided on the motor shaft 31; a first retaining spring 71 is clamped in the first annular groove 312, and a second retaining spring 72 is clamped in the second annular groove 313; wherein, the first bearing 61 is sleeved on the motor shaft 31 and is arranged between the first retaining spring 71 and the second retaining spring 72; based on this, the first bearing 61 can be limited on the motor shaft 31 along the axial direction of the motor shaft 31.

[0052] Furthermore, a key slot 310 is provided on the motor shaft 31 ; a flat key 311 is installed in the key slot 310 for transmitting the torque output outward through the motor shaft 31 .

[0053] As an embodiment of the present application, a front boss 111 is formed on the first end cover 11, and a third annular groove (not shown in the figure) is formed in the first end cover 11, and a third clamping spring 73 is clamped in the third annular groove;

[0054] The first bearing 61 is disposed between the front boss 111 and the third retaining spring 73 . Based on the above structure, the first bearing 61 can be confined in the first end cover 11 along the axial direction of the motor shaft 31 .

[0055] In the present application, the second bearing 62 is limited on the motor shaft 31 along the axial direction of the motor shaft 31; a rear boss 121 is formed on the second end cover 12, and the second bearing 62 is arranged against the front part of the rear boss 121; wherein, a corrugated gasket 74 is arranged between the second bearing 62 and the rear boss 121; based on the above structure, the motor shaft 31 can be prevented from jumping along its axial direction.

[0056] In order to ensure the safe operation of the stator assembly 2, the rotor assembly 3, the electric control board 4 and each circuit in the brushless DC motor, insulating paper 51 and insulating sleeve 52 are fixedly arranged in the installation cavity 100 to provide protection against electric shock.

[0057] The insulating paper 51 is sleeved on the motor shaft 31 , fixedly disposed at the rear of the first end cover 11 , and disposed at the front of the stator assembly 2 ;

[0058] The insulating sleeve 52 is fixedly disposed at the rear of the stator assembly 2 and covers the outer periphery of the electric control board 4 .

[0059] As an embodiment of the present invention, the stator assembly 2 includes

[0060] stator 21;

[0061] an insulating injection mold 22 matched and fixed to the stator 21; and

[0062] The winding 23;

[0063] The stator 21 includes a stator sleeve 211 and an iron core 212. The iron core 212 is integrally formed on the inner side of the stator sleeve 211. An installation gap 215 is provided between two adjacent iron cores 212. The stator sleeve 211 and the iron core 212 are made of silicon steel.

[0064] Specifically, the iron core 212 includes

[0065] an iron core portion 213 , one end of which is connected to the stator sleeve 211 ; and

[0066] an iron core end plate 214 , which is disposed at the other end of the iron core portion 213 ;

[0067] The winding 23 is wound outside the core portion 213 .

[0068] Furthermore, the insulating injection mold 22 includes

[0069] The base mold 221 has a plurality of embedding grooves 220 uniformly formed along its circumference; and

[0070] The core sleeve 224 is formed inside the base mold 221;

[0071] The core sleeve 224 corresponds to the embedding groove 220 one by one; the core sleeve 224 includes a core sleeve 2241 and a core sleeve plate 2242 ; the core sleeve plate 2242 is provided with a sinking groove 2240 communicating with the embedding groove 220 .

[0072] It can be understood that the core part 213 passes through the embedding groove 220 and is inserted into the core sleeve 2241 one by one; the core end plate 214 is fixedly configured in the sinking groove 2240; the winding 23 is fixedly wound on the outer wall of the core sleeve 2241; in addition, under the action of the core sleeve plate 2242, the winding 23 can be confined on the core sleeve 2241 without falling off.

[0073] In order to improve the strength of the base mold 221 , a plurality of base mold reinforcement ribs 2211 are formed on the inner side of the base mold 221 ; the base mold reinforcement ribs 2211 are correspondingly arranged between two adjacent core sleeves 224 .

[0074] At the same time, in order to improve the support strength of the core sleeve 224 for the winding 23, a first reinforcing rib 2243 and a second reinforcing rib 2244 are formed on the core sleeve plate 2242;

[0075] The first reinforcing rib 2243 is formed at the inner front end of the core plate 2242, and the second reinforcing rib 2244 is formed at the inner rear end of the core plate 2242.

[0076] Specifically, there is one first reinforcing rib 2243 and two second reinforcing ribs 2244 .

[0077] More specifically, a first retaining ring 222 and a second retaining ring 223 are formed on the outer periphery of the base mold 221 ; the embedding groove 220 is configured between the first retaining ring 222 and the second retaining ring 223 ; and the stator sleeve 211 is confined between the first retaining ring 222 and the second retaining ring 223 .

[0078] In a specific application scenario, the winding 23 includes a plurality of enameled wires (not shown) connected to the terminal 41. In order to prevent interference between the plurality of enameled wires, enhance insulation, and make the enameled wires run more regularly, a plurality of groove assemblies 24 are disposed at the rear of the insulating injection mold 22.

[0079] The plurality of groove components 24 are evenly arranged along the circumference of the insulating injection mold 22 ; and a wiring gap 246 is arranged between two adjacent groove components 24 .

[0080] Specifically, there are six routing gaps 246 .

[0081] Furthermore, the groove assembly 24 includes a first groove 241, a second groove 242, a third groove 243 and a fourth groove 244 arranged in parallel; the first groove 241, the second groove 242, the third groove 243 and the fourth groove 244 are sequentially arranged at the rear of the insulating injection mold 22;

[0082] The lengths of the first groove 241, the second groove 242, the third groove 243, and the fourth groove 244 decrease in sequence, and both ends of the grooves form a stepped edge 245.

[0083] Specifically, the wiring gap 246 is defined between the two opposite edges 245, and the wiring gap 246 is flared from front to back; based on the above structure, the enameled wires configured on the multiple windings 23 can be wound and embedded in the groove assembly 24 and connected to the electronic control board 4; not only the winding space is optimized, but also the insulation capacity between each winding is improved.

[0084] In order to reduce the moment of inertia of the rotor assembly 3 so that it can respond to high dynamic acceleration, a through slot assembly (not shown in the figure) is provided on the rotor 32; the through slot assembly includes

[0085] a plurality of first through slots 321 arranged along the axial direction of the motor shaft 31; and

[0086] a plurality of second through slots 322 arranged along the axial direction of the motor shaft 31;

[0087] The first through slots 321 are evenly arranged along the circumference of the rotor 32 ; and the second through slots 322 are evenly arranged between two adjacent first through slots 321 .

[0088] Furthermore, there are four first through slots 321 and twelve second through slots 322 . It is understandable that three second through slots 322 are disposed between every two adjacent first through slots 321 .

[0089] Furthermore, the longitudinal section of the first through slot 321 is square, and the longitudinal section of the second through slot 322 is circular; the central axis of the first through slot 321, the central axis of the second through slot 322 and the central axis of the motor shaft 31 are at the same distance.

[0090] Through the above-mentioned manner, the rotational inertia of the rotor assembly 3 can be reduced and the heat dissipation capacity of the rotor assembly 3 can be improved.

[0091] In the present application, the permanent magnets 33 are bonded to the rotor 32 ; a plurality of ridges 323 are evenly formed on the outer peripheral surface of the rotor 32 to separate the plurality of permanent magnets 33 ; wherein a permanent magnet 33 is disposed between every two adjacent ridges 323 .

[0092] In order to strengthen the fastening force with the motor shaft 31, a plurality of arc-shaped connecting protrusions 324 are evenly formed on the inner circumference of the rotor 32; wherein, the plurality of connecting protrusions 324 are arranged at the front and rear ends of the rotor 32; the total number of the connecting protrusions 324 is six.

[0093] As one embodiment of the present application, the insulating sleeve 52 is cylindrical, and a plurality of inserting strips 521 are fixedly disposed at the front end thereof; the inserting strips 521 are evenly disposed along the circumference of the insulating sleeve 52 .

[0094] Specifically, the number of the inserts 521 is six.

[0095] In the present application, a plurality of positioning grooves 210 are configured on the outer peripheral surface of the stator 21 ; the insertion strips 521 can be inserted into the positioning grooves 210 one by one; based on this, the insulating sleeve 52 can be fixedly configured at the rear of the stator assembly 2 .

[0096] Furthermore, a plurality of extrusion blocks 522 are arranged on the outer circumference of the insulating sleeve 52; the extrusion blocks 522 are arranged one by one at the rear of the insert 521; and a wedge-shaped surface 523 is arranged at the top rear end of the extrusion block 522 to facilitate extrusion installation on the inner wall of the housing 10.

[0097] As an embodiment of the present invention, a plurality of plug-in components 25 are formed at the rear of the insulating injection mold 22 for fixing the connector 9 ; wherein the plug-in components 25 are correspondingly arranged at the rear of the groove component 24 .

[0098] Specifically, the plug-in component 25 is configured with a first slot 251 , a second slot 252 and a third slot 253 ; the second slot 252 and the third slot 253 are symmetrically arranged on both sides of the first slot 251 .

[0099] In this application, the connecting member 9 includes

[0100] Connecting substrate 90;

[0101] a first plug-in board 91 formed at the middle of the front end of the connecting substrate 90;

[0102] a second plug-in board 92 formed in the middle of the front end of the connecting substrate 90; and

[0103] Two third plug-in boards 93 are respectively arranged on both sides of the first plug-in board 91;

[0104] Among them, the first plug-in board 91 can be matched and inserted into the first slot 251; the two third plug-in boards 93 can be correspondingly inserted into the second slot 252 and the third slot 253; the electric control board 4 is provided with a plurality of sockets 40, and the second plug-in board 92 can be inserted into the sockets 40; based on the above structure, the electric control board 4 can be positioned at the rear of the stator assembly 2.

[0105] In order to improve the insertion stability between the connecting member 9 and the plug-in component 25, first strip-shaped teeth 911 are formed on both sides of the first plug-in plate 91; second strip-shaped teeth 932 are formed on the side of the third plug-in plate 93 facing away from the first plug-in plate 91; and a hook plate 931 is formed on the side of the third plug-in plate 93 facing the first plug-in plate 91.

[0106] In order to facilitate the insertion of the second plugging plate 92 into the plug hole 40 , a plurality of chamfers 921 are configured on the rear end portion of the second plugging plate 92 .

[0107] The portion of the enameled wire extending from the groove assembly 24 to the electric control board 4 is in a non-fixed state. To prevent the portion of the enameled wire from interfering with the components inside the motor, at least two pressure plates 95 are provided on the connecting substrate 90. A hook-pressing gap 950 is provided between the pressure plate 95 and the connecting substrate 90, and the enameled wire is fixedly arranged in the hook-pressing gap 950. Based on the above structure, the portion of the enameled wire extending from the groove assembly 24 to the electric control board 4 can be effectively fixed.

[0108] In order to enable the electric control board 4 to accurately energize / de-energize the plurality of windings 23 , a magnetic ring assembly 8 is fixed to the motor shaft 31 ; and a plurality of Hall sensors 43 are provided on the electric control board 4 for detecting the rotation of the magnetic ring assembly 8 .

[0109] Specifically, there are three Hall sensors 43 , which are evenly arranged on the outside of the magnetic ring assembly 8 along the circumferential direction.

[0110] As an embodiment of the present invention, the magnetic ring assembly 8 includes

[0111] Magnetic ring body 81; and

[0112] annular insert 82;

[0113] The annular insert 82 is fixedly arranged on the motor shaft 31 ; the magnetic ring body 81 and the annular insert 82 are injection-molded into one piece; through the above-mentioned manner, the strength of the magnetic ring body 81 is increased, making the magnetic ring body 81 less susceptible to damage.

[0114] In order to ensure that the magnetic ring body 81 and the annular insert 82 are firmly connected, annular teeth 821 are formed on the outer peripheral surface of the annular insert 82 .

[0115] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A brushless DC motor, characterized in that: include: a stator assembly (2) of a fixed configuration; Rotating a rotor assembly (3) disposed in the stator assembly (2); as well as an electric control panel (4) fixed to the rear of the stator assembly (2); The stator assembly (2) comprises a stator (21), an insulating injection mold (22) matched and fixed to the stator (21), and a winding (23); a plurality of groove assemblies (24) are arranged at the rear of the insulating injection mold (22) for separating a plurality of enameled wires in the winding (23); the electric control board (4) is mounted at the rear of the insulating injection mold (22) via a connector (9); the rotor assembly (3) comprises a motor shaft (31) and a rotor (32) fixed to the motor shaft (31); a plurality of first through slots (321) and second through slots (322) are provided on the rotor (32); The insulating injection mold (22) comprises: A base mold (221) is provided with a plurality of embedding grooves (220) uniformly arranged along its circumference; and an iron core sleeve (224) formed inside the base mold (221); The core sleeve (224) corresponds to the embedded groove (220) one by one; the core sleeve (224) includes a core sleeve (2241) and a core sleeve plate (2242); the core sleeve plate (2242) is provided with a sinking groove (2240) communicating with the embedded groove (220); The stator (21) comprises a stator sleeve (211) and an iron core body (212) integrally formed inside the stator sleeve (211); The iron core (212) includes: an iron core portion (213), one end of which is connected to the stator sleeve (211); and an iron core end plate (214) disposed at the other end of the iron core portion (213); The iron core parts (213) pass through the embedding grooves (220) and are inserted into the iron core sleeves (2241) in a one-to-one correspondence; the iron core end plates (214) are fixedly arranged in the sinking grooves (2240); The connecting member (9) comprises: connecting substrate (90); a first plug-in board (91) formed in the middle of the front end of the connecting substrate (90); a second plug-in board (92) formed in the middle of the front end of the connecting substrate (90); and Two third plug-in boards (93) respectively arranged on both sides of the first plug-in board (91); Wherein, both sides of the first plug plate (91) are formed with first strip-shaped teeth (911); the side of the third plug plate (93) facing away from the first plug plate (91) is formed with second strip-shaped teeth (932); the side of the third plug plate (93) facing the first plug plate (91) is formed with a hook plate (931); A plurality of plug-in components (25) are formed on the rear portion of the insulating injection mold (22); a first slot (251), a second slot (252), and a third slot (253) are configured on the plug-in component (25); the second slot (252) and the third slot (253) are symmetrically configured on both sides of the first slot (251); The first plug-in board (91) is matched and inserted into the first slot (251); the two third plug-in boards (93) are correspondingly inserted into the second slot (252) and the third slot (253); the electric control board (4) is provided with a plurality of jacks (40), and the second plug-in boards (92) are inserted into the jacks (40).

2. The brushless DC motor according to claim 1, wherein: An insulating sleeve (52) is fixed on the stator assembly (2) for isolating the electric control board (4); The insulating sleeve (52) is arranged on the outer periphery of the electric control board (4), and a plurality of inserting strips (521) are fixedly arranged at the front end thereof; the inserting strips (521) are evenly arranged along the circumference of the insulating sleeve (52).

3. The brushless DC motor according to claim 1, wherein: A plurality of the groove components (24) are evenly arranged along the circumference of the insulating injection mold (22); a wiring gap (246) is arranged between two adjacent groove components (24); The wiring gap (246) is flared from front to back.

4. The brushless DC motor according to claim 3, wherein: The groove assembly (24) comprises a first groove (241), a second groove (242), a third groove (243) and a fourth groove (244) sequentially arranged at the rear of the insulating injection mold (22); The lengths of the first groove (241), the second groove (242), the third groove (243), and the fourth groove (244) decrease in sequence.

5. The brushless DC motor according to claim 1, wherein: The first through-slot (321) and the second through-slot (322) are both opened along the axial direction of the motor shaft (31); A plurality of the first through slots (321) are evenly arranged along the circumferential direction of the rotor (32); and the second through slots (322) are evenly arranged between two adjacent first through slots (321).

6. The brushless DC motor according to claim 5, wherein: The longitudinal section of the first through groove (321) is square, and the longitudinal section of the second through groove (322) is circular.

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