Stator structure of a brushless DC permanent magnet motor

Abstract

The invention discloses a stator structure of a DC brushless permanent magnet motor, including a DC brushless permanent magnet motor body, the DC brushless permanent magnet motor body including a rotating shaft, a bearing, a stator assembly, a rotor assembly, a rear end cover and a front end cover, the rotating shaft is rotatably mounted inside the rear end cover and the front end cover through a bearing, a rotor assembly is mounted on the rotating shaft, the inner end surfaces of the rear end cover and the front end cover are mounted with a stator assembly, the rotor assembly is mounted inside the stator assembly, the adjacent ends of the rear end cover and the front end cover are locked and connected by screws and nuts, the adjacent ends of the rear end cover and the front end cover are provided with a limiting groove, the rotating shaft is rotatably connected with the adjacent rear end cover and the front end cover through a bearing, and also includes a stator retainer for positioning the stator assembly inside the rear end cover and the front end cover. The invention can accelerate heat dissipation while improving the heat dissipation efficiency during use, and at the same time locate the position of the stator inside the permanent magnet brushless motor, improve the stability of the stator during use, and facilitate installation and limiting.

Description

Technical Field

[0001] The invention relates to the technical field of brushless DC permanent magnet motors, and in particular to a stator structure of a brushless DC permanent magnet motor. Background Art

[0002] Permanent magnet brushless motors are small and exquisite and are everywhere. They are widely used in almost every field of aerospace, national defense, industrial and agricultural production and daily life. Permanent magnet brushless DC motors are generally composed of three parts: the motor body, the electronic switching circuit and the rotor position sensor.

[0003] Existing range hoods and new energy vehicle air-conditioning motors all use brushless DC permanent magnet motors, but the existing motor stator punchings are key components in the motor, which have a direct impact on the efficiency of the motor. The existing motor stator punchings have a small heat dissipation area and cannot effectively and quickly take away the heat generated by the stator core. The heat is easily accumulated and increased, affecting the normal use of the motor and even burning the motor. At the same time, the existing stator assembly lacks a dedicated stator retainer, and the stator assembly cannot be clamped and positioned in the later stage.

[0004] Therefore, a stator structure of a DC brushless permanent magnet motor is needed, which can accelerate heat dissipation and improve the heat dissipation efficiency during use, and at the same time locate the position of the stator inside the permanent magnet brushless motor, improve the stability of the stator during use, and facilitate installation and limiting. Summary of the invention

[0005] The purpose of the present invention is to provide a stator structure of a brushless DC permanent magnet motor, aiming to improve the existing motor stator punching sheet, which is a key component in the motor and has a direct impact on the efficiency of the motor. The existing motor stator punching sheet has a small heat dissipation area and cannot effectively and quickly take away the heat generated by the stator core. The heat is easily accumulated and increased, affecting the normal use of the motor and even burning the motor. At the same time, the existing stator assembly has few dedicated stator retainers, and the stator assembly cannot be clamped and positioned in the later stage.

[0006] The present invention is achieved in that:

[0007] A stator structure of a DC brushless permanent magnet motor comprises a DC brushless permanent magnet motor body, wherein the DC brushless permanent magnet motor body comprises a rotating shaft, a bearing, a stator assembly, a rotor assembly, a rear end cover and a front end cover, wherein the rotating shaft is rotatably mounted inside the rear end cover and the front end cover via a bearing, the rotor assembly is mounted on the rotating shaft, the stator assembly is mounted on the inner end surfaces of the rear end cover and the front end cover, the rotor assembly is mounted inside the stator assembly, the adjacent ends of the rear end cover and the front end cover are locked and connected via screws and nuts, the adjacent ends of the rear end cover and the front end cover are provided with limiting grooves, the rotating shaft is rotatably connected with the adjacent rear end cover and the front end cover via a bearing, and further comprises a stator retainer for positioning the stator assembly inside the rear end cover and the front end cover.

[0008] Furthermore, the stator assembly includes a stator core and a frame made of insulating material, the frame is arranged inside the rear cover and the front cover, and multiple stator cores are evenly installed on the frame, and the stator core is composed of multiple stator punchings.

[0009] Furthermore, a plurality of insulating grooves are evenly arranged on both sides of the frame, an insulating cylinder is fixedly sleeved on the outer circumference of the frame, and a plurality of winding frames are evenly arranged inside the frame.

[0010] Furthermore, the wire groups are wound on the winding frames of the skeleton, the wires of the wire groups of the skeleton are arranged in the insulating grooves, the wires of the wire groups of the skeleton are bound by wire harnesses, and the wires of the wire groups of the skeleton are bound to the skeleton by binding tapes.

[0011] Furthermore, an outer circumferential surface of the stator punching sheet is provided with an external heat dissipation groove penetrating through the end surfaces on both sides, and a plurality of the external heat dissipation grooves are evenly arranged along the outer circumferential direction of the stator punching sheet, and an inner heat dissipation groove is provided on the inner circumferential surface of the stator punching sheet, penetrating through the end surfaces on both sides, and a plurality of the internal heat dissipation grooves are evenly arranged along the inner circumferential direction of the stator punching sheet.

[0012] Furthermore, a heat dissipation hole groove is provided on the side end face of the stator punching sheet and horizontally penetrates the other side end face. A plurality of heat dissipation hole grooves are evenly arranged along the outer circumferential direction of the stator punching sheet. A plurality of positioning holes are evenly provided on the side end face of the stator punching sheet. The positioning holes on the stator punching sheet are connected to the frame through positioning rods.

[0013] Furthermore, a cable sheath is connected through the bottom surface of the front end cover, and a power line extending from the inside of the rear end cover and the front end cover is inserted through the cable sheath, and terminals are welded at the ends of the power line.

[0014] Furthermore, the power cord includes a first wire group, a second wire group and a third wire group, and the first wire group, the second wire group and the third wire group are wound on winding frames on adjacent skeletons in sequence.

[0015] Furthermore, the stator retainer includes an insert sleeve and a clamping sleeve. The insert sleeve is limitedly inserted into the interior of the clamping sleeve. The insert sleeve and the clamping sleeve are assembled and limitedly fixed in the limiting grooves adjacent to the inner walls of the rear end cover and the front end cover.

[0016] Furthermore, a plurality of positioning sheet grooves are evenly arranged on the outer circumference of the insert tube, and positioning sheets are installed in the positioning sheet grooves of the insert tube. The positioning sheets are made of elastic material, and one end of the positioning sheets is fixed in the positioning sheet groove of the insert tube. A clamping groove is evenly arranged on the inner circumference of the clamping tube, and the clamping groove of the clamping tube is engaged with the positioning sheet groove on the insert tube. A first positioning ring is fixed at one end of the insert tube, and the first positioning ring is installed in the limiting groove of the rear end cover. A second positioning ring is fixed at one end of the clamping tube, and the second positioning ring is installed in the limiting groove of the front end cover.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: when the stator structure of the brushless DC permanent magnet motor is used, the insulating sleeve is firstly fixed on the outside of the stator assembly, and then the stator assembly is inserted into the insert sleeve of the stator holder, and then the sleeve in the stator holder is clamped on the outside of the insert sleeve, and then the rotor assembly is installed on the rotating shaft, and the rotor assembly is inserted into the inner ring of the skeleton of the stator assembly, and then the rear end cover and the front end cover are respectively assembled and connected by bearings on both sides of the rotating shaft, and then the rear end cover and the front end cover are assembled and connected by screws, nuts and gaskets, and the rear end cover and the front end cover are clamped by the limit grooves of the limit grooves of the rear end cover and the front end cover. The stator retainer limits the position of the stator assembly. At the same time, the stator core is composed of multiple stator punchings. The stator punchings are provided with external heat dissipation grooves, heat dissipation hole grooves and internal heat dissipation grooves to accelerate heat dissipation, avoid heat accumulation, and reduce the heat of the core. This can accelerate heat dissipation while improving the heat dissipation efficiency during use. At the same time, the position of the stator inside the permanent magnet brushless motor is positioned, the stability of the stator during use is improved, and installation limitation is convenient, thereby overcoming the existing problem of accelerating heat dissipation while improving the heat dissipation efficiency during use. At the same time, the position of the stator inside the permanent magnet brushless motor is positioned, the stability of the stator during use is improved, and installation limitation is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the overall structure of the stator structure of a brushless DC permanent magnet motor;

[0020] Figure 2 It is an overall side view of the stator structure of the brushless DC permanent magnet motor;

[0021] Figure 3 is a side view of a stator assembly in an embodiment of a stator structure of a brushless DC permanent magnet motor;

[0022] Figure 4 is a front view of a terminal in an embodiment of a stator structure of a brushless DC permanent magnet motor;

[0023] Figure 5 1 is a front view of a stator assembly in an embodiment of a stator structure of a brushless DC permanent magnet motor;

[0024] Figure 6 1 is a structural schematic diagram of a vertical cross section of a stator assembly in an embodiment of a stator structure of a brushless DC permanent magnet motor;

[0025] Figure 7 It is a schematic diagram of the winding of the cable winding in the stator assembly of the stator structure embodiment of the brushless DC permanent magnet motor;

[0026] Figure 8 It is a schematic diagram of a stator punching sheet in a stator assembly of a stator structure embodiment of a brushless DC permanent magnet motor;

[0027] Fig. 9 1 is a schematic structural diagram of a stator retainer in a stator structure embodiment of a brushless DC permanent magnet motor;

[0028] Fig.10 1 is a schematic diagram of the exploded structure of a stator retainer in an embodiment of the stator structure of a brushless DC permanent magnet motor;

[0029] Fig.11 It is a structural schematic diagram of a skeleton in a stator structure embodiment of a brushless DC permanent magnet motor.

[0030] In the figure: 1, rotating shaft; 11, washer; 12, retaining ring; 13, wave spring washer; 2, bearing; 3, stator assembly; 31, stator core; 32, insulation groove; 33, wire harness; 34, winding group; 35, binding band; 36, insulation cylinder; 37, skeleton; 371, winding rack; 38, stator punching plate; 381, outer heat dissipation groove; 382, ​​heat dissipation hole groove; 383, inner heat dissipation groove; 384, positioning hole; 4, rotor assembly; 5, rear end cover; 6, front end cover; 7, screw; 8, cable sheath; 9, power cord; 91, first wire group; 92, second wire group; 93, third wire group; 10, terminal; 14, stator retainer; 141, insert sleeve; 142, positioning plate groove; 143, positioning plate; 145, clamping sleeve; 146, clamping groove; 147, second positioning ring. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 and Fig.11 As shown, a stator structure of a DC brushless permanent magnet motor includes a DC brushless permanent magnet motor body, which includes a rotating shaft 1, a bearing 2, a stator assembly 3, a rotor assembly 4, a rear end cover 5 and a front end cover 6. The rotating shaft 1 is rotatably mounted inside the rear end cover 5 and the front end cover 6 through the bearing 2, the rotor assembly 4 is mounted on the rotating shaft 1, the stator assembly 3 is mounted on the inner end surfaces of the rear end cover 5 and the front end cover 6, the rotor assembly 4 is mounted inside the stator assembly 3, the adjacent ends of the rear end cover 5 and the front end cover 6 are locked and connected by screws 7 and nuts, and the adjacent ends of the rear end cover 5 and the front end cover 6 are provided with limiting grooves, the rotating shaft 1 is rotatably connected with the adjacent rear end cover 5 and the front end cover 6 through the bearing 2, the end of the rotating shaft 1 and the inside of the front end cover 6 are connected by a gasket 11, the rotating shaft 1 and the rear end cover 5 are connected by a retaining ring 12 and a wave spring washer 13, and also includes a stator retainer 14 for positioning the stator assembly 3 inside the rear end cover 5 and the front end cover 6.

[0033] Furthermore, when using the stator structure of the brushless DC permanent magnet motor, firstly, the outer part of the stator assembly 3 is fixedly sleeved with an insulating sleeve 36, and then the stator assembly 3 is inserted into the insert sleeve 141 of the stator holder 14, and then the clamping sleeve 145 in the stator holder 14 is clamped on the outer part of the insert sleeve 141, and then the rotor assembly 4 is installed on the rotating shaft 1, and the rotor assembly 4 is inserted into the inner ring of the skeleton 37 of the stator assembly 3, and then the rear end cover 5 and the front end cover 6 are respectively rotated and connected on both sides of the rotating shaft 1 through the bearing 2, and then assembled by screws 7 with nuts and gaskets. The rear end cover 5 and the front end cover 6 are connected, and the stator retainer 14 is limited and clamped through the limiting grooves of the rear end cover 5 and the front end cover 6 to limit the position of the stator assembly. At the same time, the stator core 31 is composed of multiple stator punchings 38. The stator punchings 38 are provided with external heat dissipation grooves 381, heat dissipation hole grooves 382 and internal heat dissipation grooves 383 to accelerate heat dissipation, avoid heat accumulation, and reduce the heat of the core. This can accelerate heat dissipation and improve the heat dissipation efficiency during use. At the same time, the position of the stator inside the permanent magnet brushless motor is positioned, the stability of the stator during use is improved, and installation and limiting are facilitated.

[0034] See also Figure 3 The stator assembly 3 includes a stator core 31 and a frame 37 made of insulating material. The frame 37 is arranged inside the rear cover 5 and the front cover 6. A plurality of stator cores 31 are evenly mounted on the frame 37. The stator core 31 is composed of a plurality of stator punchings 38.

[0035] Furthermore, a skeleton 37 is arranged inside the rear end cover 5 and the front end cover 6, and a plurality of stator cores 31 are evenly mounted on the skeleton 37. The stator core 31 is composed of a plurality of stator punching sheets 38, thereby ensuring the magnetic flux while dispersively installing the plurality of stator cores 31 and the wire group 34.

[0036] See also Fig.11 A plurality of insulating grooves 32 are evenly arranged on both sides of the frame 37 , an insulating cylinder 36 is fixedly sleeved on the outer circumference of the frame 37 , and a plurality of winding frames 371 are evenly arranged inside the frame 37 .

[0037] Furthermore, multiple insulating grooves 32 are evenly arranged on both sides of the skeleton 37 for guiding and installing winding cables. An insulating tube 36 is fixedly sleeved on the outer circumference of the skeleton 37 to improve the overall insulation of the wire group 34. Multiple winding frames 371 are evenly arranged inside the skeleton 37 to facilitate the installation of the wire group 34.

[0038] See also Figure 3 The wire group 34 is wound on the winding frame 371 of the skeleton 37, the wires of the wire group 34 of the skeleton 37 are arranged in the insulating groove 32, the wires of the wire group 34 of the skeleton 37 are bound by the wire harness 33, and the wires of the wire group 34 of the skeleton 37 are bound to the skeleton 37 by the binding belt 35.

[0039] Furthermore, the wire group 34 is wound on the winding frame 371 of the skeleton 37, the wires of the wire group 34 of the skeleton 37 are set in the insulating groove 32, the wires of the wire group 34 of the skeleton 37 are bound by the wire harness 33, and the wires of the wire group 34 of the skeleton 37 are bound to the skeleton 37 by the binding tape 35, so as to ensure the stability of the cable winding and avoid the complexity of the cable.

[0040] See also Figure 7 An outer circumferential surface of the stator punching sheet 38 is provided with an outer heat dissipation groove 381 penetrating through the end surfaces on both sides, and a plurality of outer heat dissipation grooves 381 are evenly arranged along the outer circumferential direction of the stator punching sheet 38. An inner circumferential surface of the stator punching sheet 38 is provided with an inner heat dissipation groove 383 penetrating through the end surfaces on both sides, and a plurality of inner heat dissipation grooves 383 are evenly arranged along the inner circumferential direction of the stator punching sheet 38.

[0041] Furthermore, external heat dissipation grooves 381 are provided on the outer circumferential surface of the stator punching 38 and penetrate the end surfaces on both sides. Multiple external heat dissipation grooves 381 are evenly arranged along the outer circumferential direction of the stator punching 38. Internal heat dissipation grooves 383 are provided on the inner circumferential surface of the stator punching 38 and penetrate the end surfaces on both sides. Multiple internal heat dissipation grooves 383 are evenly arranged along the inner circumferential direction of the stator punching 38. The external heat dissipation grooves 381 and the internal heat dissipation grooves 383 provided on the inner and outer circumferences of the stator punching 38 increase the contact area with the air, provide air flow channels, and accelerate the air dissipation flow rate.

[0042] See also Figure 7A heat dissipation hole groove 382 is horizontally opened on the side end surface of the stator punching sheet 38 and runs horizontally through the other side end surface. A plurality of heat dissipation hole grooves 382 are evenly arranged along the outer circumferential direction of the stator punching sheet 38. A plurality of positioning holes 282 are evenly opened horizontally on the side end surface of the stator punching sheet 38. The positioning holes 282 on the stator punching sheet 38 are connected to the frame 37 through a positioning rod.

[0043] Furthermore, a heat dissipation hole groove 382 is opened horizontally through the other side end face of the stator punching sheet 38, and a plurality of heat dissipation hole grooves 382 are evenly arranged along the outer circumferential direction of the stator punching sheet 38. A plurality of positioning holes 282 are evenly opened horizontally on the side end face of the stator punching sheet 38. The positioning holes 282 on the stator punching sheet 38 are connected to the frame 37 through a positioning rod. An internal air flow channel is set through the heat dissipation hole groove 382 to accelerate air heat dissipation. At the same time, a plurality of positioning holes 282 are evenly opened horizontally on the side end face of the stator punching sheet 38 to facilitate the later positioning and installation of the stator punching sheet 38 on the frame 37.

[0044] See also Figure 2 A cable sheath 8 is connected to the bottom surface of the front end cover 6, and a power line 9 extending from the inside of the rear end cover 5 and the front end cover 6 is inserted into the cable sheath 8, and a terminal 10 is welded to the end of the power line 9.

[0045] Furthermore, a cable sheath 8 is connected through the bottom surface of the front end cover 6, and a power cord 9 extending from the inside of the rear end cover 5 and the front end cover 6 is inserted through the cable sheath 8 to facilitate the protection of the guiding power cord 9. A terminal 10 is welded at the end of the power cord 9 to facilitate the connection of the terminal 10.

[0046] See also Figure 2 The power cord 9 includes a first wire group 91 , a second wire group 92 and a third wire group 93 , and the first wire group 91 , the second wire group 92 and the third wire group 93 are sequentially wound on a winding frame 371 on an adjacent skeleton 37 .

[0047] Then, the first wire group 91 , the second wire group 92 and the third wire group 93 are sequentially wound around the winding frame 371 on the adjacent skeleton 37 , thereby being sequentially wound around the skeleton 37 .

[0048] See also Fig. 9 and Fig.10 The stator retainer 14 includes an insert sleeve 141 and a clamp sleeve 145 . The insert sleeve 141 is limitedly inserted into the interior of the clamp sleeve 145 . The insert sleeve 141 and the clamp sleeve 145 are assembled and fixed in the limiting grooves adjacent to the inner walls of the rear end cover 5 and the front end cover 6 .

[0049] Then, the insert sleeve 141 is limitedly inserted into the interior of the clamping sleeve 145, and the insert sleeve 141 and the clamping sleeve 145 are assembled and fixed in the limiting grooves adjacent to the inner walls of the rear end cover 5 and the front end cover 6, so as to position and clamp the insert sleeve 141 and the clamping sleeve 145 on the stator retainer 14.

[0050] See also Fig. 9 and Fig.10 A plurality of positioning sheet grooves 142 are evenly provided on the outer circumference of the insert cylinder 141, and positioning sheets 143 are installed in the positioning sheet grooves 142 of the insert cylinder 141. The positioning sheets 143 are made of elastic material, and one end of the positioning sheet 143 is fixed in the positioning sheet groove 142 of the insert cylinder 141. A card groove 146 is evenly provided on the inner circumference of the cartridge 145, and the card groove 146 of the cartridge 145 is snap-fitted with the positioning sheet groove 142 on the insert cylinder 141. A first positioning ring 144 is fixed at one end of the insert cylinder 141, and the first positioning ring 144 is installed in the limiting groove of the rear end cover 5. A second positioning ring 147 is fixed at one end of the cartridge 145, and the second positioning ring 147 is installed in the limiting groove of the front end cover 6.

[0051] Furthermore, a plurality of positioning sheet grooves 142 are evenly provided on the outer circumference of the insert sleeve 141, and positioning sheets 143 are installed in the positioning sheet grooves 142 of the insert sleeve 141. The positioning sheets 143 are made of elastic material, and one end of the positioning sheet 143 is fixed in the positioning sheet groove 142 of the insert sleeve 141. A clamping groove 146 is evenly provided on the inner circumference of the clamping sleeve 145, and the clamping groove 146 of the clamping sleeve 145 is engaged with the positioning sheet groove 142 on the insert sleeve 141, so as to plug and hold the positioning insert sleeve 141 and the clamping sleeve 145, and a first positioning ring 144 is fixed at one end of the insert sleeve 141, and the first positioning ring 144 is installed in the limiting groove of the rear end cover 5, and a second positioning ring 147 is fixed at one end of the clamping sleeve 145, and the second positioning ring 147 is installed in the limiting groove of the front end cover 6, so as to be limitedly installed on the rear end cover 5 and the front end cover 6.

[0052] Working principle: When using the stator structure of the DC brushless permanent magnet motor, first, the outer part of the stator assembly 3 is fixedly sleeved with an insulating sleeve 36, and then the stator assembly 3 is inserted into the insert sleeve 141 of the stator holder 14, and then the clamping sleeve 145 in the stator holder 14 is clamped on the outer part of the insert sleeve 141, and then the rotor assembly 4 is installed on the rotating shaft 1, and the rotor assembly 4 is inserted into the inner ring of the skeleton 37 of the stator assembly 3, and then the rear end cover 5 and the front end cover 6 are respectively rotated and connected on both sides of the rotating shaft 1 through the bearing 2, and then assembled by screws 7 with nuts and gaskets. The rear end cover 5 and the front end cover 6 are connected, and the stator retainer 14 is limited and clamped through the limiting grooves of the rear end cover 5 and the front end cover 6 to limit the position of the stator assembly. At the same time, the stator core 31 is composed of multiple stator punchings 38. The stator punchings 38 are provided with external heat dissipation grooves 381, heat dissipation hole grooves 382 and internal heat dissipation grooves 383 to accelerate heat dissipation, avoid heat accumulation, and reduce the heat of the core. This can accelerate heat dissipation and improve the heat dissipation efficiency during use. At the same time, the position of the stator inside the permanent magnet brushless motor is positioned, the stability of the stator during use is improved, and installation and limiting are facilitated.

[0053] The device obtained through the above design can basically meet the requirements of accelerating heat dissipation, improving the heat dissipation efficiency during use, and at the same time positioning the stator inside the permanent magnet brushless motor, improving the stability of the stator during use, and facilitating the installation of the stator structure of the limited DC brushless permanent magnet motor. However, in order to further improve its functions, the designer has made further improvements to the device.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A stator structure of a brushless DC permanent magnet motor, comprising a brushless DC permanent magnet motor body, the brushless DC permanent magnet motor body comprising a rotating shaft (1), a bearing (2), a stator assembly (3), a rotor assembly (4), a rear end cover (5) and a front end cover (6), the rotating shaft (1) being rotatably mounted inside the rear end cover (5) and the front end cover (6) through the bearing (2), the rotor assembly (4) being mounted on the rotating shaft (1), the stator assembly (3) being mounted on the inner end surfaces of the rear end cover (5) and the front end cover (6), the rotor assembly (4) being mounted inside the stator assembly (3), the adjacent ends of the rear end cover (5) and the front end cover (6) being locked and connected by screws (7) and nuts, the adjacent ends of the rear end cover (5) and the front end cover (6) being provided with limiting grooves, characterized in that: It also includes a stator retainer (14) for positioning the stator assembly (3) inside the rear end cover (5) and the front end cover (6); the stator assembly (3) includes a stator core (31) and a frame (37) made of an insulating material, the frame (37) is arranged inside the rear end cover (5) and the front end cover (6), a plurality of stator cores (31) are evenly mounted on the frame (37), and the stator cores (31) are composed of a plurality of stator punching sheets (38); the stator retainer (14) includes an insert sleeve (141) and a clamping sleeve (145), and the stator assembly (3) is inserted into the insert sleeve (141) of the stator retainer (14); the insert sleeve (141) is limitedly inserted into the interior of the clamping sleeve (145), and the insert sleeve (141) and the clamping sleeve (145) are assembled and limitedly fixed in the limit grooves adjacent to the inner walls of the rear end cover (5) and the front end cover (6); A plurality of positioning sheet grooves (142) are uniformly provided on the outer circumference of the insert cylinder (141), and positioning sheets (143) are installed in the positioning sheet grooves (142) of the insert cylinder (141). The positioning sheets (143) are made of elastic material, and one end of the positioning sheets (143) is fixed in the positioning sheet groove (142) of the insert cylinder (141). A clamping groove (146) is uniformly provided on the inner circumference of the clamping cylinder (145), and the clamping groove (146) of the clamping cylinder (145) is engaged with the positioning sheet groove (142) on the insert cylinder (141). A first positioning ring (144) is fixed at one end of the insert cylinder (141), and the first positioning ring (144) is installed in the limiting groove of the rear end cover (5). A second positioning ring (147) is fixed at one end of the clamping cylinder (145), and the second positioning ring (147) is installed in the limiting groove of the front end cover (6).

2. The stator structure of a brushless DC permanent magnet motor according to claim 1, characterized in that: A plurality of insulating grooves (32) are evenly arranged on both sides of the frame (37), an insulating cylinder (36) is fixedly sleeved on the outer circumference of the frame (37), and a plurality of winding frames (371) are evenly arranged inside the frame (37).

3. The stator structure of a brushless DC permanent magnet motor according to claim 2, characterized in that: A wire group (34) is wound on the winding frame (371) of the frame (37), the wires of the wire group (34) of the frame (37) are arranged in the insulating groove (32), the wires of the wire group (34) of the frame (37) are bound by a wire harness (33), and the wires of the wire group (34) of the frame (37) are bound to the frame (37) by a binding belt (35).

4. The stator structure of a brushless DC permanent magnet motor according to claim 1, characterized in that: An outer circumferential surface of the stator punching sheet (38) is provided with an outer heat dissipation groove (381) penetrating through the end surfaces on both sides, and a plurality of the outer heat dissipation grooves (381) are evenly arranged along the outer circumferential direction of the stator punching sheet (38). An inner circumferential surface of the stator punching sheet (38) is provided with an inner heat dissipation groove (383) penetrating through the end surfaces on both sides, and a plurality of the inner heat dissipation grooves (383) are evenly arranged along the inner circumferential direction of the stator punching sheet (38).

5. The stator structure of a brushless DC permanent magnet motor according to claim 4, characterized in that: A heat dissipation hole groove (382) is provided on the side end surface of the stator punching sheet (38) and runs horizontally through the other side end surface. A plurality of heat dissipation hole grooves (382) are evenly arranged along the outer circumference direction of the stator punching sheet (38). A plurality of positioning holes (282) are evenly provided on the side end surface of the stator punching sheet (38). The positioning holes (282) on the stator punching sheet (38) are connected to the frame (37) via positioning rods.

6. The stator structure of a brushless DC permanent magnet motor according to claim 1, characterized in that: A cable sheath (8) is connected to and penetrates the bottom surface of the front end cover (6), and a power line (9) extending from the inside of the rear end cover (5) and the front end cover (6) is sleeved through the cable sheath (8), and a terminal (10) is welded to the end of the power line (9).

7. The stator structure of a brushless DC permanent magnet motor according to claim 6, characterized in that: The power cord (9) comprises a first wire group (91), a second wire group (92) and a third wire group (93), and the first wire group (91), the second wire group (92) and the third wire group (93) are sequentially wound on a winding frame (371) on an adjacent frame (37).

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