WO2019007040A1 - External rotor electric machine - Google Patents

Abstract

An external rotor electric machine, comprising a stator core (1), a coil winding (2), an end insulator (3), a plastic encapsulated body (4), a bearing base (5), and bearings (6). The end insulator is mounted on the end surface of the stator core; the coil winding is disposed on the end insulator; a central hole (11) is arranged at center of the stator core; the bearing base comprises a first bearing base (51) and a second bearing base (52); the first bearing base and the second bearing base are respectively embedded onto two ends of the central hole; the bearings are respectively mounted in the first bearing base and the second bearing base; at least one heat dissipation sheet (521) extends out of the edge of the end portion of the second bearing base; the plastic encapsulated body connects the stator core, the coil winding, the end insulator, the first bearing base, the second bearing base, and the heat dissipation sheet as one piece; at least a part of the heat dissipation sheet is exposed onto the end surface of the plastic encapsulated body so as to accelerate heat dissipation, such that the heat dissipation performance and operation efficiency of the electric machine is improved.

Description

External rotor motor Technical field:

The utility model relates to an outer rotor motor.

Background technique:

The heat dissipation of the existing plastic-sealed motor bearings has always been a relatively difficult technical problem. During the development of the plastic-sealed outer rotor air conditioner, the stator coil winding temperature is transmitted to the bearing, resulting in excessive bearing temperature rise and bearing operation. The heat generated in the process is difficult to dissipate, resulting in shortened bearing life, unstable operation, unreliable motor operation, and reduced motor life, which are not desired by designers or customers.

The specific structure comprises: a stator assembly, an outer rotor assembly, a rotating shaft, a bearing seat and a bearing, the outer rotor assembly is connected with the rotating shaft, the outer rotor assembly is sleeved outside the stator assembly, and the rotating shaft support is mounted on the bearing, the stator assembly comprises Stator core, end insulation and coil winding, the end insulation is installed on both end faces of the stator core, the coil winding is wound on the end insulation, the center hole is opened in the middle of the stator core, and the bearing seat is nested and mounted on the stator At both ends of the through hole in the middle of the iron core, when the motor is running, the coil winding generates heat, heat is quickly transferred from the stator core to the bearing housing, and then transmitted to the bearing, so that the bearing temperature is too high, resulting in short bearing life and motor running time. It will produce noise.

In addition, when the motor is integrally injection molded with end insulation, due to the limitation of the injection molding process, the positioning of the stator core is required for the injection molding. After the positioning, the insulating material is injected into the mold to form the injection stator, and the injection stator is taken out of the mold. After that, the end face of the injection stator will form a positioning hole at the position where the positioning column is positioned, thereby causing the winding of the coil winding through the positioning hole when the stator is wound, and the creepage distance is insufficient to cause a bad pressure or even a burning machine. It is not necessary to solve the insulation problem at the positioning hole.

Summary of the invention:

The purpose of the utility model is to provide a plastic-sealed stator and its application to an outer-rotor motor, which solves the technical problem that the bearing heat in the prior art is difficult to dissipate, the bearing life is shortened, the running efficiency of the motor is reduced, and the service life of the motor is shortened.

The purpose of the utility model is achieved by the following technical solutions:

An outer rotor motor comprising a molded stator and an outer rotor assembly, the outer rotor assembly being sleeved on a plastic stator comprising a stator core, a coil winding, an end insulation, a plastic body, a bearing seat and a bearing The end insulation is mounted on the end surface of the stator core, the coil winding is wound around the end insulation, the center of the stator core is provided with a central hole, and the bearing housing comprises a first bearing seat and a second bearing seat, the first bearing The seat and the second bearing seat are respectively nested at two ends of the center hole, and the bearings are respectively installed in the first bearing seat and the second bearing seat, wherein the end edge of the second bearing seat extends outwardly At least one heat sink, the molding body integrally connects the stator core, the coil winding, the end insulation, the first bearing seat, the second bearing seat and the heat sink, and the heat sink is at least partially exposed on the end surface of the molding body Speed up heat dissipation.

Two end fins extend outwardly from the end edge of the second bearing seat, the two fins are symmetrical, and the laminating body insulates the stator core, the coil winding, the end insulation, the first bearing seat, and the second bearing The seat and the two heat sinks are integrally connected, and the two heat sinks are at least partially exposed on the end surface of the plastic body to accelerate heat dissipation.

The top surface of the heat sink is at least partially exposed on the end surface of the molding body.

The top surface of the heat sink includes an A region and a B region, and the A region is exposed on an end surface of the molding body, and the B region is covered by the molding body, and the B region is provided with a plurality of through holes.

The top surface of the heat sink is all exposed on the end surface of the molded body.

The second bearing housing and the heat sink are integrally die cast or die cut.

The second bearing housing and the heat sink are made of aluminum or a metal material having a high thermal conductivity.

The above-mentioned at least one end of the end insulation of the one end is provided with a step, the step is located at one side of the through hole, one of the bearing seats is mounted on the step, and the bearing is mounted on the bearing seat.

A step is disposed on the inner side of the end insulation of the two ends, the two steps are respectively located at two sides of the center hole, the first bearing seat and the second bearing seat are respectively mounted on the steps of the two ends, and the bearing is mounted on the first bearing seat and On the second bearing housing.

The step described above is a circular step, and the first bearing housing and the second bearing housing are made of a metal material.

The end insulation described above includes an annular yoke insulator and a plurality of tooth insulators extending from the annular yoke insulator, the end portions are provided with a lower end surface and an upper end surface, and the end portions are provided with a plurality of insulation layers. The positioning hole has a boss protruding from the upper end surface around the positioning hole.

The above-mentioned bosses are annular bosses, and the positioning holes and the bosses are distributed on the tooth insulators.

At least one positioning hole and one boss are disposed on each of the tooth insulators described above.

A wire stud is disposed on the tooth insulator, and a connecting groove is disposed on the wire stud.

The stator core described above includes an annular yoke portion and a plurality of first and second tooth portions projecting outwardly from an outer edge of the annular yoke portion, the first tooth portion and the second tooth portion are alternately circumferentially arranged, and the second The tooth portion includes a common root portion, a left curved tooth extending outward from the common root portion, at least one second straight tooth and a right curved tooth, a left curved tooth and a second straight tooth, and a second straight tooth and a right curved tooth Forming a second welt groove therebetween, a first welt groove is formed between the first tooth portion and the second tooth portion, wherein the first tooth portion is split from the middle portion into the first root portion and the first top portion, The first portion and the first top are coupled together by a cooperation of the first card slot and the first card block.

The second straight tooth is divided into a second root portion and a second top portion from the middle portion, and the second root portion and the second top portion are connected together by the cooperation of the second card slot and the second card block.

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

1) The utility model comprises a stator core, a coil winding, an end insulation, a plastic sealing body, a bearing seat and a bearing, the end insulation is mounted on the end surface of the stator core, and the coil winding is wound around the end insulation, the stator a central hole is defined in the middle of the iron core, the bearing housing includes a first bearing seat and a second bearing seat, the first bearing seat and the second bearing seat are respectively nested at two ends of the center hole, and the end edge of the second bearing seat Extending at least one heat sink to the epitaxial body, the plastic body integrally connecting the stator core, the coil winding, the end insulation, the first bearing seat, the second bearing seat and the heat sink, and the heat sink is at least partially exposed in the plastic body Accelerate heat dissipation on the end face, improve heat dissipation, improve heat dissipation performance of the motor, and improve operating efficiency of the motor;

2) The end edge of the second bearing housing extends two fins outwardly, the two fins are symmetrical, and the plastic sealing body insulates the stator core, the coil winding, the end insulation, the first bearing seat and the second bearing The seat and the two heat sinks are integrally connected, and the two heat sinks are at least partially exposed on the end surface of the plastic body to accelerate heat dissipation;

3) The top surface of the heat sink is at least partially exposed on the end surface of the plastic body to improve the heat dissipation effect;

4) The top surface of the heat sink is all exposed on the end surface of the plastic body to improve the heat dissipation effect;

5) The second bearing housing and the heat sink are integrally die-cast or die-cut, and the structure is simple and easy to process.

6) The utility model at least has a step on the inner side of the end insulation of one end, the step is located on one side of the central hole, the bearing seat is mounted on the step, the bearing is mounted on the bearing seat, and the end insulation has a certain heat insulation effect. The bearing seat is mounted on the end insulation. When the motor is running, the heat transfer from the stator core to the bearing housing is reduced, which can prevent the bearing temperature from being too high, prolong the bearing life and reduce the running noise of the motor.

7) A step is provided on the inner side of the end insulation of both ends, two steps are respectively located on both sides of the center hole, and the two bearing seats are respectively mounted on the steps on both ends, and the bearing is mounted on the bearing seat, in addition to preventing the bearing temperature from being over Highly, the two-step positioning can also ensure the concentricity of the bearings on the two bearing seats, simplifying the process.

8) A step is arranged on the inner side of the end insulation, the step is located on one side of the center hole, and the bearing seat is mounted on the step so as to have a preliminary fixing effect on the bearing seat, and the bearing seat does not shift when the injection is performed. Simplify the process and improve the positioning accuracy of the bearing.

9) The utility model is provided with a plurality of positioning holes on the insulating body, and a protruding table is protruded around the positioning hole, and the creepage distance is increased by adding a boss around the positioning hole, thereby improving the safety and reliability of the injection molded stator. And the pass rate, the boss is an annular boss, so that the shape of the boss is reasonable, the forming is convenient, the positioning hole and the boss are distributed on the tooth insulator, so that the positioning hole is evenly distributed and the force is uniform when the stator is injection molded. To improve product quality, at least one positioning hole and one boss are distributed on each tooth insulator, the positioning hole and the boss position are more reasonable, and the force is more uniform. The above-mentioned tooth insulator is provided with a connecting stud, and the connecting stud is provided with a connecting groove, which not only makes the positioning of the stator accurate when injection molding, increases the creepage distance, and also has a lug groove on the stud. Make rational use of space.

10) in the stator core, the first tooth portion is split from the middle portion into the first root portion and the first top portion, so that the first weaving groove on both sides of a first tooth portion forms a common first slot. When the machine is wound, the enameled wire enters the first welt groove from the first slot, which effectively avoids the injury or hanging line when the enameled wire enters the first weaving groove; the first top is respectively mounted on the first root after the coil winding ends The independence and insulation between the first welt grooves are ensured, and the overall performance of the stator core is ensured; the second straight teeth are split from the middle into the second root and the second top, so that a second tooth Each of the second welt grooves in the portion forms a common second slot. When the machine is wound, the enameled wire enters the second welt groove from the second slot, and the second top is mounted on the second root after the coil is wound. In the above, the winding is convenient and efficient; the first card slot and the second card slot are trapezoidal slots or dovetail slots, and the first top and the second top are better fixed.

BRIEF DESCRIPTION OF THE DRAWINGS:

1 is a perspective view of a molded stator according to an embodiment of the present invention;

2 is a partial schematic view of a molded stator of the first embodiment of the present invention;

Figure 3 is a front elevational view of the molded stator of the first embodiment of the present invention;

Figure 4 is a cross-sectional view taken along line A-A of Figure 3;

Figure 5 is a perspective view of the outer rotor motor of the first embodiment of the present invention;

Figure 6 is a front elevational view of the outer rotor motor of the first embodiment of the present invention;

Figure 7 is a cross-sectional view taken along line B-B of Figure 6;

Figure 8 is a perspective view of the second embodiment of the present invention;

Figure 9 is a front elevational view of the second embodiment of the present invention;

Figure 10 is a cross-sectional view taken along line C-C of Figure 9;

Figure 11 is a schematic view showing the end insulation structure of the second embodiment of the present invention;

Figure 12 is a perspective view of the third embodiment of the present invention;

Figure 13 is a front elevational view of the third embodiment of the present invention;

Figure 14 is a cross-sectional view taken along line D-D of Figure 13;

Figure 15 is a perspective view of one of the plastic-sealed stators of the fourth embodiment of the present invention;

Figure 16 is a perspective view showing another angle of the molded stator of the fourth embodiment of the present invention;

Figure 17 is an exploded view of the molded stator of the fourth embodiment of the present invention;

Figure 18 is a plan view of the molded stator of the fourth embodiment of the present invention;

Figure 19 is a cross-sectional view taken along line E-E of Figure 18;

Figure 20 is a partial enlarged view of a portion F of Figure 19;

21 is a schematic structural view of a stator core according to Embodiment 5 of the present invention;

Figure 22 is a front elevational view of a stator core according to a fifth embodiment of the present invention;

23 is an exploded view of a stator core according to Embodiment 5 of the present invention;

Figure 24 is an enlarged view of I of Figure 23;

Figure 25 is a bottom plan view of the molded stator of the sixth embodiment of the present invention;

Figure 26 is a perspective view showing a structure of a plastic-sealed stator according to a sixth embodiment of the present invention;

Figure 27 is a wiring diagram of a plastic sealed stator according to Embodiment 6 of the present invention;

Figure 28 is a perspective view showing another structure of the plastic-sealed stator of the sixth embodiment of the present invention;

Figure 29 is an exploded view showing another structure of the molded stator of the sixth embodiment of the present invention.

Detailed ways:

The present invention will be further described in detail below through the specific embodiments and the accompanying drawings.

Embodiment 1:

As shown in FIGS. 1 to 7, the present embodiment is an outer rotor motor comprising a plastic-sealed stator and an outer rotor assembly 7, the outer rotor assembly 7 being sleeved on a plastic-sealed stator, the plastic-sealed stator including a stator core 1. The coil winding 2, the end insulation 3, the plastic sealing body 4, the bearing housing 5 and the bearing 6, the end insulation 3 is mounted on the end surface of the stator core 1, and the coil winding 2 is wound around the end insulation 3, A stator hole 5 is defined in the middle of the stator core 1 , and the bearing housing 5 includes a first bearing housing 51 and a second bearing housing 52 . The first bearing housing 51 and the second bearing housing 52 are respectively nested at two ends of the center hole 11 . The bearing 6 is respectively mounted in the first bearing housing 51 and the second bearing housing 52, wherein the end edge of the second bearing housing 52 extends outwardly to at least one heat sink 521, and the molding body 4 will be the stator. The iron core 1, the coil winding 2, the end insulation 3, the first bearing housing 51, the second bearing housing 52 and the heat sink 521 are integrally connected, and the heat sink 521 is at least partially exposed on the end surface 41 of the molding body 4 to accelerate heat dissipation. .

Two end fins 521 extend outwardly from the end edge of the second bearing housing 52. The two fins 521 are symmetrical, and the molding body 4 insulates the stator core 1, the coil winding 2, and the end portion. A bearing block 51, a second bearing block 52 and two fins 521 are integrally connected, and the two fins 521 are at least partially exposed on the end face 41 of the molding body 4 to accelerate heat dissipation.

The top surface 5211 of the heat sink 521 is at least partially exposed on the end surface 41 of the molding body 4.

The top surface 5211 of the heat sink 521 includes an A region 5211A and a B region 5211B exposed on the end surface 41 of the molding body 4, the B region 5211B being covered by the molding body 4, the B region 5211B A plurality of through holes 522 are provided in the upper portion.

The second bearing housing 52 and the heat sink 521 are integrally die-cast or die-cut.

The second bearing housing 52 and the heat sink 521 are made of a metal material having a high aluminum or thermal conductivity.

The above structure can be further improved: the top surface 5211 of the heat sink 521 is entirely exposed on the end surface 41 of the molding body 4.

Embodiment 2:

As shown in FIGS. 8 to 11, the present embodiment is an improvement of the first embodiment: a step 31 is provided on the inner side of the end insulation 3 at one end, and the step 31 is located on one side of the through hole 14, one of which The bearing housing 52 is mounted on the step 31 and the bearing 6 is mounted on the bearing housing 52. The step 31 is a circular step, and the first bearing housing 51 and the second bearing housing 52 are made of a metal material. The rotary shaft 8 is supported on the bearing 6 inside the first bearing housing 51 and the second bearing housing 52.

The advantage of this structure is that the heat transfer of the stator core 1 to the bearing housing is greatly reduced, which can prevent the bearing temperature from being too high, prolong the bearing life, and reduce the motor running noise.

Implementation of column three:

As shown in FIG. 12 to FIG. 14, this embodiment is an improvement to the second embodiment: a solution that is easily conceived by those skilled in the art: a step 31 is provided on the inner side of the end insulation 3 at both ends, two The steps 31 are respectively located on both sides of the center hole 11, and the first bearing housing 51 and the second bearing housing 52 are respectively mounted on the steps 31 at both ends, and the bearing 3 is mounted on the first bearing housing 51 and the second bearing housing 52. The step 31 is a circular step, and the first bearing housing 51 and the second bearing housing 52 are made of a metal material. The rotary shaft 8 is supported on the bearing 6 inside the first bearing housing 51 and the second bearing housing 52.

Implementation of column four:

As shown in FIGS. 15 to 20, this embodiment is an improvement of the first embodiment: the main improvement point is a plastically sealed stator comprising a stator core 1, an end insulation 3 and a coil winding 2, the stator The iron core 1 includes an annular yoke portion 12 and a plurality of tooth portions 13 extending from the annular yoke portion 12, and a wire groove 14 is formed between the adjacent two tooth portions 13, and an end portion of the stator core 1 is provided with an end insulation 3 The end insulation 3 includes an upper end insulation and a lower end insulation. The inner wall of the wire groove 14 is provided with a slot insulation 300. The upper end insulation, the lower end insulation and the slot insulation 300 are integrally molded on the stator core 1.

Wherein: the upper end insulation comprises an annular yoke insulator 32 and a plurality of tooth insulators 33 extending from the annular yoke insulator 32, the upper end portion being insulatedly provided with a lower end surface 34 and an upper end surface 35, the upper end portion being insulated A plurality of positioning holes 36 are defined, and a boss 37 is protruded from the upper end surface 35 around the positioning hole 36. The lower end portion 34 of the upper end insulation is attached to the end surface of the stator core 1, the annular yoke insulator 32 is placed over the annular yoke portion 12, and the tooth insulator 33 is placed over the tooth portion 13.

Wherein: the lower end insulation comprises an annular yoke insulator 32 and a plurality of tooth insulators 33 extending from the annular yoke insulator 32, the lower end portion being insulatedly provided with a lower end surface 34 and an upper end surface 35, the lower end portion being insulated A plurality of positioning holes 36 are defined, and a boss 37 is protruded from the upper end surface 35 around the positioning hole 36. The lower end insulating lower end surface 34 is attached to the end surface of the stator core 1, the annular yoke insulator 32 is placed on the annular yoke portion 12, and the tooth insulator 33 is placed on the tooth portion 13.

Preferably, the boss 37 is an annular boss.

Preferably, the boss 37 is a circular boss.

Preferably, the positioning holes 36 and the bosses 37 are distributed on the tooth insulator 33.

Preferably, at least one positioning hole 36 and one boss 37 are disposed on each of the tooth insulators 33.

Preferably, the tooth insulator 33 is provided with a wire stud 38, and the wire stud 38 is provided with a connecting groove 381.

Embodiment 5:

As shown in Figs. 21 to 24, this embodiment is an improvement of the first embodiment: the main improvement is in the stator core 1, the stator core 1 including the annular yoke portion 12 and the ring yoke portion A plurality of first tooth portions 131 and second tooth portions 132 projecting outwardly on the outer side edge 12, the first tooth portion 131 and the second tooth portion 132 are alternately circumferentially arranged, and the second tooth portion 132 includes a common root portion 1321, and is common a left curved tooth 1322 protruding outwardly from the root portion 1321, at least one second straight tooth 1323 and a right curved tooth 1324, between the left curved tooth 1322 and the second straight tooth 1323, and the second straight tooth 1323 and the right curved tooth 1324 A second wire groove 16 is formed, and a first wire groove 15 is formed between the first tooth portion 131 and the second tooth portion 132. The first tooth portion 131 is divided into a first root portion 131A and a first top portion 131B from the middle portion. The first root portion 131A and the first top portion 131B are connected together by the cooperation of the first card slot 131C and the first card block 131D. The second straight teeth 1323 are split into a second root portion 1323A and a second top portion 1323B from the middle portion, and the second root portion 1323A and the second top portion 1323B are coupled by the second card slot 1323C and the second card block 1323D. Together. The first card slot 131C is a dovetail slot or a T-shaped slot, and the second slot 1323C is a dovetail slot or a T-shaped slot.

Example 6:

As shown in FIG. 25 to FIG. 29, this embodiment is an improvement on Embodiment 4 and Embodiment 5: the main improvement is to add a boss 3313 to the end insulation 3 to solve the problem that the existing stator winding has an enameled wire. The specific structure of the problem of slotting, injury line and break line is as follows:

The stator core 1 includes an annular yoke portion 12 and a plurality of first and second tooth portions 131 and 132 extending outward from the outer edge of the annular yoke portion 12. The first tooth portion 131 and the second tooth portion 132 are alternately arranged circumferentially. The second tooth portion 132 includes a common root portion 1321 , a left curved tooth 1322 protruding outward from the common root portion 1321 , at least one second straight tooth 1323 and a right curved tooth 1324 , and a left curved tooth 1322 and a second straight tooth 1323 . a second wire groove 16 is formed between the second straight tooth 1323 and the right curved tooth 1324, and a first wire groove 15 is formed between the first tooth portion 131 and the second tooth portion 132;

The end insulation 3 includes an annular yoke insulator 32 and a plurality of tooth insulators 33 extending from the annular yoke insulator 32. The plurality of tooth insulators 33 include a first insulating tooth portion 332 and a second insulating tooth portion 331. The second insulating tooth portion 331 and the first insulating tooth portion 332 are alternately circumferentially arranged. The second insulating tooth portion 331 includes a common insulating tooth root portion 3311 and a plurality of insulating protruding teeth 3312 extending outward from the common insulating tooth root portion 3311. The outer side edge of the insulating protruding tooth 3312 is provided with a boss 3313;

The annular yoke insulator 32 is at an end surface of the annular yoke portion 12, the first insulating tooth portion 332 is at an end surface of the first tooth portion 131, and the second insulating tooth portion 331 is at the second tooth portion. End face of portion 132;

The boss 3313 includes a first boss 3313A. The first boss 3313A has a second boss 3313B extending along the insulating pin 3312 toward the common insulating root 3311. The coil winding 2 spans the first tooth. The portion 131 is placed in two adjacent second welt grooves 16 such that the first boss 3313A and the second boss 3313B press the coil winding 2 inward.

The outer edge of the first insulating tooth portion 332 is provided with a third boss 3321.

A baffle 3314 is disposed between the common insulating root portion 3311 and the insulating protruding teeth 3312, and the baffle 3314 is arcuate.

The insulating protruding teeth 3312 include two insulating bending teeth 3312A and one insulating straight tooth 3312B, and the first boss 3313A and the second boss 3313B are disposed on the insulating bending teeth 3312A.

The first protruding portion 3313A is disposed on the insulating protruding tooth 3312 of the end insulating member 3, and the second protruding portion 3313A extends from the side of the first protruding portion 3313A along the convex tooth toward the common root portion. By adding the second protruding portion 3313B, When the outer groove is wound, the enameled wire is pressed inward, thereby reducing the enameled wire exit slot and adding the second wedge without inserting the wedge at the groove of the weaving groove, which has fewer processing steps and improves production efficiency.

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

Claims (16)

An outer rotor motor comprising a molded stator and an outer rotor assembly (7), the outer rotor assembly (7) being sleeved on a plastic stator, the plastic stator comprising a stator core (1), a coil winding (2) End insulation (3), plastic sealing body (4), bearing housing (5) and bearing (6), end insulation (3) is mounted on the end face of the stator core (1), coil winding (2) is wound On the end insulation (3), a central hole (11) is defined in the middle of the stator core (1), and the bearing housing (5) includes a first bearing seat (51) and a second bearing seat (52), first A bearing housing (51) and a second bearing housing (52) are respectively nested at two ends of the center hole (11), and the bearings (6) are respectively mounted on the first bearing housing (51) and the second bearing housing (52) The feature is that the end edge of the second bearing housing (52) extends outwardly to at least one heat sink (521), and the plastic sealing body (4) connects the stator core (1) and the coil winding (2) The end insulation (3), the first bearing housing (51), the second bearing housing (52) and the heat sink (521) are integrally connected, and the heat sink (521) is at least partially exposed in the molding body (4). Accelerate heat dissipation on the end face (41). The outer rotor motor according to claim 1, wherein the end edge of the second bearing housing (52) extends outwardly from two fins (521), and the two fins (521) Is symmetrical, the molded body (4) will stator core (1), coil winding (2), end insulation (3), first bearing housing (51), second bearing housing (52) and two fins (521) is integrally connected, and the two fins (521) are at least partially exposed on the end surface (41) of the molding body (4) to accelerate heat dissipation. An outer rotor motor according to claim 1 or 2, characterized in that: the top surface (5211) of the heat sink (521) is at least partially exposed on the end face (41) of the molding body (4). An outer rotor motor according to claim 3, characterized in that the top surface (5211) of the heat sink (521) comprises an A area (5211A) and a B area (5211B), the A area (5211A) Exposed on the end face (41) of the molding body (4), the B region (5211B) is covered by the molding body (4), and the B region (5211B) is provided with a plurality of through holes (522). An outer rotor motor according to claim 3, characterized in that the top surface (5211) of the heat sink (521) is entirely exposed on the end face (41) of the molding body (4). The outer rotor motor according to claim 3, wherein the second bearing housing (52) and the heat sink (521) are integrally die-cast or die-cut, and the second bearing housing (52) And the heat sink (521) is made of aluminum or a metal material having a high thermal conductivity. An outer rotor motor according to claim 3, characterized in that at least one step (31) is provided on the inner side of the end insulation (3) at one end, and the step (31) is located on one side of the through hole (14). One of the bearing housings (52) is mounted on the step (31) and the bearing (6) is mounted on the bearing housing (52). An outer rotor motor according to claim 7, wherein a step (31) is provided on the inner side of the end insulation (3) at both ends, and the two steps (31) are respectively located at the center hole (11). On both sides, the first bearing housing (51) and the second bearing housing (52) are respectively mounted on the steps (31) at both ends, and the bearing (3) is mounted on the first bearing housing (51) and the second bearing housing (52) on. An outer rotor motor according to claim 8, wherein said step (31) is a circular step, and said first bearing housing (51) and said second bearing housing (52) are made of a metal material. to make. An outer rotor motor according to claim 1 or 2, wherein the end insulation (3) comprises an annular yoke insulator (32) and a plurality of tooth insulators extending from the annular yoke insulator (32) (33), the end insulation (3) is provided with a lower end surface (34) and an upper end surface (35), and the end insulation (3) is provided with a plurality of positioning holes (36), the positioning holes ( 36) A boss (37) protrudes from the upper end surface (35). An outer rotor motor according to claim 10, wherein said boss (37) is a toroidal boss, and said positioning hole (36) and boss (37) are distributed in the tooth insulator. (33) Upper. An outer rotor motor according to claim 11, wherein at least one positioning hole (36) and one boss (37) are disposed on each of the tooth insulators (33). The outer rotor motor according to claim 12, wherein the tooth insulator (33) is provided with a terminal stud (38), and the terminal stud (38) is provided with a connecting groove (381). ). An outer rotor motor according to claim 3, wherein said stator core (1) comprises an annular yoke (12) and a plurality of extensions extending outward from an outer edge of the annular yoke (12) a tooth portion (131) and a second tooth portion (132), the first tooth portion (131) and the second tooth portion (132) are alternately circumferentially arranged, and the second tooth portion (132) includes a common root portion (1321), Left curved teeth (1322) extending from the common root portion (1321), at least one second straight tooth (1323) and right curved tooth (1324), left curved tooth (1322) and second straight tooth (1323) A second wire groove (16) is formed between the second straight tooth (1323) and the right curved tooth (1324), and a first inlay is formed between the first tooth portion (131) and the second tooth portion (132). a wire groove (15), characterized in that the first tooth portion (131) is split from the middle portion into a first root portion (131A) and a first top portion (131B), the first root portion (131A) and the first top portion (131B) ) is connected by the cooperation of the first card slot (131C) and the first card block (131D). An outer rotor motor according to claim 14, wherein said second spur (1323) is split from the middle into a second root (1323A) and a second top (1323B), said first The two root portions (1323A) and the second top portion (1323B) are coupled together by a cooperation of the second card slot (1323C) and the second card block (1323D). The stator core according to claim 15, wherein the first card slot (131C) is a dovetail slot or a T-shaped slot, and the second card slot (1323C) is a dovetail slot or a T-shaped slot.

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