CN103795174B - motor - Google Patents

Abstract

The present invention discloses a motor, comprising a mounting base, the mounting base comprising a bracket portion and a bearing seat connected to the bracket portion, wherein the bracket portion and the bearing seat are provided separately. The bracket portion and the bearing seat of the mounting base are provided separately, which is convenient for manufacturing and low in cost.

Description

motor

【Technical field】

The invention relates to the technical field of aircraft power devices, in particular to a motor.

【Background technique】

With the development of new permanent magnet materials, microelectronics technology, automatic control technology and power electronics technology, motors have made great progress. The motor uses electronic commutation to replace the traditional mechanical commutation. With its advantages of reliable performance, no wear, low failure rate, small size and high efficiency, it has gradually developed from the initial military field to the aerospace field.

The aircraft is capable of vertical take-off and landing, stable hovering and autonomous cruising, and is suitable for police surveillance, news photography, fire command, traffic management, geological disaster investigation and pipeline cruising to realize real-time mobile surveillance in the air. At present, the power of the aircraft is realized in the form of a motor-driven propeller. That is, the motor is equipped with a propeller, so that the rotation of the rotor of the motor is converted into thrust or lift to the propeller.

A motor in the related art includes a mounting base, a stator fixed on the mounting base, a rotating shaft connected in rotation with the mounting base, and a rotor connected with the rotating shaft. As shown in Fig. 13, the mounting seat 1' includes a bracket part 2' and a bearing seat 3' extending from the middle of the bracket part 2' to a direction away from the bracket part 2'. The bracket part 2' is integrally formed with the bearing seat 3'. The bearing seat 3' includes a connecting portion 31' connected to the bracket part 2', and an upper end part 32' extending from the connecting part 31' in a direction away from the bracket part 2', penetrating from the upper end part 32' to the connecting part 31' The accommodating part 33' for accommodating the rotating shaft and the bearing (not shown) housed in the upper end part 32' and sheathed outside the rotating shaft. The stator includes a main body and a through hole passing through the main body and sleeved on the outer surface of the bearing housing 3'.

When assembling the above-mentioned motor, since the bracket part and the bearing seat are integrally formed, it is inconvenient to manufacture and the cost is high. Moreover, the through hole of the stator can only be sleeved into the bearing seat from the upper end of the bearing seat. Thus, the dimensions of the upper end must match the inner diameter of the through-hole.

In order to meet the miniaturization of the motor, the inner diameter of the through hole cannot be enlarged arbitrarily, resulting in corresponding restrictions on the size of the bearing and the rotating shaft accommodated in the bearing housing. Therefore, larger-sized bearings and rotating shafts cannot be realized, resulting in smaller sizes of the upper end, bearing housing and rotating shaft, and weak impact resistance.

Therefore, it is necessary to provide a new motor to overcome the above disadvantages.

【Content of invention】

The object of the present invention is to provide a motor that is easy to manufacture.

The object of the present invention is achieved in the following way: a motor, which includes a mounting base, the mounting base includes a bracket part and a bearing seat connected to the bracket part, wherein the bracket part and the bearing seat are separately arranged . The bearing housing includes a connecting portion and an upper end connected to the connecting portion and away from the support portion, the connecting portion includes a connecting wall and a receiving space surrounded by the connecting wall, and the upper end includes a The upper storage tank, the projection of the inner surface of the connecting wall from the connecting part to the upper end falls in the upper receiving tank, and the outer surface of the connecting part is from the connecting part to the upper end The projection of the direction falls within the outer surface of the upper end. The bracket part is provided with a bracket body, the bracket body is provided with a receiving hole, and the bearing seat also includes a lower end connected to the connecting wall and inserted into the receiving hole.

Preferably, the upper end further includes an extension wall extending from the connecting wall in a direction away from the receiving space and an upper wall bent and extending from the extending wall away from the connecting wall, and the upper receiving groove It is jointly surrounded by the extension wall and the upper wall.

Preferably, the motor further includes a rotating shaft that is rotatably connected to the mounting base, and the rotating shaft includes an upper shaft portion inserted into the upper receiving groove of the upper end portion and the connecting portion inserted into the shaft portion. The outer diameter of the upper shaft part is larger than the outer diameter of the lower shaft part.

Preferably, the lower end is provided with a lower receiving groove, and the motor further includes an upper bearing accommodated in the upper receiving groove and a lower bearing accommodated in the lower receiving groove, and the outer diameter of the upper bearing is larger than The outer diameter of the lower bearing.

Preferably, from an end away from the connecting portion to an end close to the connecting portion, the inner diameter of the receiving hole gradually decreases.

Preferably, the motor also includes a stator fixed on the mounting seat and a rotor rotating relative to the stator, the stator includes at least one pair of coil leads, and the motor also includes a The protection structure on the mounting seat and/or the stator, the protection structure is used to prevent the rotor from being in direct contact with the coil lead wires.

Preferably, the stator includes a hollow receiving portion, and the inner diameter of the receiving portion is smaller than the outer diameter of the upper end portion.

Compared with the related art, in the motor of the present invention, the bracket part of the installation seat is separately provided from the bearing seat, which is convenient to manufacture and low in cost.

【Description of drawings】

FIG. 1 is an exploded perspective view of the motor of the present invention, in which the coils of the stator are omitted.

Fig. 2 is a perspective view of the motor of the present invention.

Fig. 3 is a perspective view of the mounting seat of the motor of the present invention.

Fig. 4 is a three-dimensional exploded view of the mounting seat of the motor of the present invention.

Fig. 5 is an exploded perspective view of the motor of the present invention with the rotor omitted, wherein the coil leads of the stator are omitted.

Fig. 6 is a three-dimensional exploded view of the motor of the present invention omitting the rotor from another perspective, wherein the coil leads of the stator are omitted.

Fig. 7 is a perspective view of the stator and the mounting seat of the motor of the present invention, wherein the coil of the stator is omitted.

Fig. 8 is a sectional view of the motor of the present invention.

Fig. 9 is a perspective view of the stator of the motor of the present invention.

Fig. 10 is an exploded perspective view of the rotor of the motor of the present invention.

Fig. 11 is a schematic diagram of the assembly of the protection structure of the motor and the lead wire group of the stator according to the present invention.

Fig. 12 is a schematic cross-sectional view of the lead wire group wrapped by the stator by the protective structure of the motor according to the present invention.

Fig. 13 is an exploded perspective view of the mounting base of the motor related to the present invention.

【detailed description】

The motor 100 of the present invention will be described in detail below with reference to the accompanying drawings.

The motor 100 can be used to drive the propeller of an aircraft. As shown in Figures 1 and 2, the motor 100 includes a mounting base 1, a stator 2 fixed on the mounting base 1, a rotor 4 rotating relative to the stator 2, and a rotating shaft connected to the rotor 4 3.

As shown in FIGS. 3 to 4 , the mounting base 1 includes a bracket part 5 and a bearing seat 6 connected to the bracket part 5 . In order to facilitate the manufacture of the mounting seat 1 and lower the cost, the bracket part 5 and the bearing seat 6 are separately provided.

The bracket part 5 is provided with a bracket body 51, a receiving hole 52 on the bracket body 51 for accommodating the bearing seat 6, and a plurality of reliefs on the bracket body 51 and arranged around the receiving hole 52. Heavy part 53. The accommodating hole 52 is located in the middle of the bracket body 51 and is used to cooperate with the bearing seat 6 . The accommodating hole 52 can be a blind hole or a through hole, as long as it plays the role of accommodating the bearing seat 6 . In this embodiment, the receiving hole 52 is a through hole. The weight reducing portion 53 can be a blind hole, a through hole or a notch, as long as the weight of the bracket portion 5 can be reduced.

As shown in FIGS. 3 to 8 , the bearing seat 6 is in the shape of a hollow column, and includes a lower end portion 61 accommodated in the receiving hole 52 of the support portion 5 and an upper end portion 62 away from the support portion 5 And the connecting portion 63 connecting the lower end portion 61 and the upper end portion 62 .

The connecting portion 63 includes a connecting wall 631 and a receiving space 632 surrounded by the connecting wall 631 .

The upper end portion 62 includes an extension wall 621 extending from the connecting wall 631 away from the receiving space 632 , an upper wall 622 bent and extending from the extending wall 621 away from the connecting wall 631 , and a The extension wall 621 and the upper wall 622 jointly define an upper receiving groove 623 . Preferably, the extension wall 621 can be omitted, and the upper wall 622 extends radially from the connecting wall 631 .

The lower end portion 61 includes an abutment wall 611 extending from an end of the connecting wall 63 away from the upper end portion 62 toward the receiving space 632 , and an abutment wall 611 extending away from the upper end portion 62 from the abutment wall 611 . The bent and extended installation wall 612 , and the lower receiving groove 613 formed by the abutting wall 611 and the installation wall 612 together. The extension direction of the extension wall 621 is opposite to the extension direction of the abutting wall 611 ; the extension direction of the upper wall 622 is also opposite to the extension direction of the installation wall 612 .

The upper receiving groove 623 , the receiving space 632 and the lower receiving groove 613 communicate with each other in order to ensure that the rotating shaft 3 is inserted therein. The inner diameter of the upper receiving groove 623 is larger than the inner diameters of the receiving space 632 and the lower receiving groove 613 respectively; the inner diameter of the receiving space 632 is larger than the inner diameter of the lower receiving groove 613 . In other words: projection along the axial direction of the rotating shaft 3, the inner surface of the connecting wall 631 falls into the upper receiving groove 623; the inner surface of the lower receiving groove 613 falls into the receiving space 632 Inside; the projection of the outer surface of the connecting wall 631 of the connecting portion 63 from the connecting portion 63 to the direction of the upper end portion 62 falls within the outer surface of the upper end portion 62, that is, the outer diameter of the connecting portion 63 smaller than the outer diameter of the upper end portion 62 .

In this embodiment, the abutting wall 611 of the lower end portion 61 extends toward the receiving space 632 close to the connecting portion 63 , so that the abutting wall 611 abuts against the bracket body 51 ; The outer surface of the installation wall 612 interferes with the inner surface of the receiving hole 52 of the bracket part 5 , so as to improve the stability of the connection between the bearing seat 6 and the bracket part 5 . In other words, the outer diameter of the installation wall 612 is adapted to the inner diameter of the receiving hole 52 for tight or interference fit, while the outer diameter of the connecting wall 631 is larger (or slightly larger) than the The inner diameter of the receiving hole 52 is such that the abutting wall 611 abuts against the bracket body 51 to achieve positioning and prevent the connecting portion 63 from passing through the receiving hole 52 .

The motor 100 further includes an upper bearing 71 accommodated in the upper receiving groove 623 and a lower bearing 72 accommodated in the lower receiving groove 613 . The inner diameter of the upper receiving groove 623 is larger than the inner diameters of the receiving space 632 and the lower receiving groove 613 respectively, so the outer diameter of the upper bearing 71 is also larger than the outer diameter of the lower bearing 72 . In this embodiment, the matching structure of the upper bearing 71 and the lower bearing 72 is selected so that the rotating shaft 3 is rotationally connected with the mounting base 1 . In other optional embodiments, the upper bearing 71 can be used alone to fix the rotating shaft 3, or both the upper bearing 71 and the lower bearing 72 can be omitted, and the rotating shaft 3 is directly connected to the bearing Seat 6 rotates and fits.

In other optional implementation manners, the abutting wall 611 may be omitted, and the installation wall 612 is directly used to interfere with the inner surface of the receiving hole 52 . In this way, the inner diameter of the receiving space 632 is the same as the inner diameter of the lower receiving groove 613 , thereby increasing the size of the lower bearing 72 accommodated in the lower receiving groove 613 and improving the stability of the motor 100 . In other words, the lower end portion 61 can be omitted, and the connecting portion 63 is directly inserted into the receiving hole 52 of the bracket portion 5; or the connecting portion 63 is directly connected to the bracket body 51 without being inserted into the receiving hole 52. In the receiving hole 52, such as welding or adhesion.

The rotating shaft 3 is connected in rotation with the mounting seat 1, and it includes an upper shaft portion 31 accommodated in the upper end portion 62 of the bearing seat 6 and inserted into the upper bearing 71, and the upper shaft portion The lower shaft part 32 extending from one end of the upper shaft part 31 and inserted into the receiving space 632 and the lower bearing 72 respectively, and the through hole 415 extending from the other end of the upper shaft part 31 through the rotor 4 Connect the shaft 33 . The outer diameter of the upper shaft part 31 is larger than the outer diameter of the lower shaft part 32; the connecting shaft 33 is used for fixed connection with the propeller of the aircraft.

Please refer further to Fig. 9, the stator 2 includes a bobbin 21 (see Fig. 6) and several coils 22 (see Fig. 6) wound on the bobbin 21, specifically, the bobbin 21 includes A hollow housing part 211 for housing the bearing seat 6, a number of supporting parts 212 scattered and extending from the housing part 211 in a direction away from the housing part 211, and a terminal connected to each of the supporting parts 212 Peripheral part 213 . Wherein, any of the coils 22 is provided with a body portion 220 and a pair of coil lead wires (not shown) respectively drawn out from two ends of the body portion 220 . In this embodiment, the pair of coil leads includes a head coil lead (not shown) and an end coil lead (not shown). During assembly, the coils 22 are respectively wound on the support portions 212 of the bobbin 21, and are connected to the bobbin 21 by means of the receiving portion 211 and the peripheral portion 213 of the bobbin 21. a solid connection. In this embodiment, the stator 2 is provided with 12 support parts 212 , correspondingly, one coil 22 is provided on each support part 212 , that is, 12 coils 22 are provided. Any of the coils 22 is provided with a head coil lead wire and an end coil lead wire, so the stator 2 in this embodiment is provided with 12 head coil lead wires and 12 end coil lead wires. These first-end coil leads and end-coil lead wires form three sets of lead wire groups 26 through delta or star connection. In an optional embodiment, in order to form three sets of lead wires 26, the stator 2 includes at least three coils 22, so as to form three pairs of the coil lead wires.

Please refer further to FIG. 10 , the rotor 4 includes an upper cover 41 , an outer cover 42 fixed on the upper cover 41 and at least one magnetic steel 43 connected with the upper cover 41 . The upper cover 41 includes a cover plate 411, a side wall 412 bent and extended from the cover plate 411, a plurality of support grooves 413 on the side wall 412 for fixing the magnetic steel 43 and a 411 and/or several ventilation holes 414 on the side wall 412 . The cover plate 411 defines a through hole 415 for accommodating the rotating shaft 3 therethrough. In this embodiment, the rotor 4 is provided with several magnetic steels 43 , and all the magnetic steels 43 are fixed on the upper cover 41 and abut against the outer cover 42 . Actually, the magnetic steel 43 is not limited to be connected with the upper cover 41 . During assembly, the inner surface of the outer cover 42 is fixed on the outer surface of the side wall 412 ; several magnetic steels 43 are respectively fixed on the corresponding support grooves 413 and abut against the inner surface of the outer cover 42 .

The magnetic steel 43 is in block shape or tile shape, and its material can be NdFeB rare earth permanent magnet material, but not limited to this permanent magnet material. In this embodiment, the number of magnetic poles of the magnetic steel 43 is 28, and its N and S poles are arranged at intervals and bonded to the inner side of the outer cover 42 . The outer cover 42 is made of magnetically permeable material. In other optional implementation manners, the outer cover can be omitted, and the rotation of the rotor can be realized directly by using the electromagnetic field formed by the magnetic steel and the coil of the stator energized; or the support slot 413 can also be omitted It is also feasible that the magnetic steel is directly attached to the inner surface of the side wall of the upper cover.

It should be noted that, in a preferred embodiment, the motor 100 further includes a protection structure 8 located below the rotor 4 (where the rotor 4 is adjacent to the mounting base 1 ). The protection structure 8 is used to prevent the rotor 4 from being in direct contact with the coil lead wire (not shown) of the stator 2 or the lead wire set 26 composed of the coil lead wire, so as to protect the coil lead wire or the lead wire set 26 . In this embodiment, the protection structure 8 includes a protection body 81 , an insertion opening 82 passing through the protection body 81 , and at least one lead hole 83 passing through the protection body 81 . The protective structure 8 is made of insulating and/or wear-resistant material. The wear-resistant material can prevent the coil lead wire or the lead wire set 26 from being worn; the insulating material can prevent the coil lead wire or the lead wire set 26 from being short-circuited after being worn by the rotor 4 . The insertion opening 82 communicates with the receiving hole 52 of the bracket part 5 for receiving the bearing seat 6 of the mounting seat 1 and the lower shaft part 32 of the rotating shaft 3 . The distance from the lead wire hole 83 to the center of the insertion port 82 is smaller than the inner diameter of the rotor 4 to ensure that the rotor 4 is not in direct contact with the coil lead wire or the lead wire group 26; preferably, the lead wire hole 83 The distance to the axis of the rotating shaft 3 (that is, the center of the insertion port 82 or the center of the rotor 4) is smaller than the inner diameter of the peripheral portion 213, so as to further prevent the sharp corners or edges of the peripheral portion 213 from impacting the lead wire group 26. wear and tear. Specifically, as shown in FIG. 6 , FIG. 8 and FIG. 11 , in this embodiment, the lead wire set 26 or the coil lead wire includes a lead-out portion 261 drawn from the body portion 220 close to the rotation shaft 3 and an insertion portion 262 extending from the extraction portion 261 away from the rotation shaft 3 and electrically connected to an external power source. When assembled, the lead-out portion 261 is located below the stator 2 and above the protective body 81; and the distance from the lead wire hole 83 to the axis of the rotating shaft 3 is smaller than the inner diameter of the rotor 4, so that the lead-out portion 261 Avoid contact with the inner surface of the magnetic steel 43 or the peripheral part 213 of the rotor 4 through the limiting effect of the lead wire hole 83; from the direction from the stator 2 to the bracket part 5, the insertion part 262 from the The lead hole 83 is inserted from the upper side of the protective body 81 to the lower side of the protective body 81 . It is not difficult to understand that, with the protection of the protective body 81 , the insertion portion 262 will not contact the rotor 4 . In addition, after assembly, the lead-out portion 261 of the lead wire set 26 is located between the stator 2 and the protective body 81, making full use of the existing space between the stator 2 and the protective body 81, ensuring that the motor 100's of miniaturization. The lead wire set 26 of this embodiment can effectively protect the lead wire set 26 by adopting such a routing method, and indirectly ensure the stable performance of the motor 100 .

In another optional embodiment, the lead wire hole 83 can be omitted, and the lead wire set 26 is located between the protection body 81 and the bracket body 51 , for example, the lead wire set 26 directly passes through the insertion port 82 The wires are routed. With the protection of the protective body 81 , the lead wire set 26 will not be in direct contact with the rotor 4 , thereby protecting the lead wire set 26 .

In this embodiment, the protective structure 8 is connected to the mounting seat 1 and the stator 2 respectively. In fact, the protective structure 8 may only be connected to one of the mounting seat 1 or the stator 2 . When the protective structure 8 is only connected to the stator 2, the protective structure 8 can directly cover the outer surface of the lead wire group 26 or directly cover the outer surface of each coil lead wire, or the protective structure 8 is fixed on the coil frame 21 of the stator 2 and covers the coil lead wire or the lead wire group 26 . In addition, the protective structure 8 can also be integrally formed with the mounting seat 1 or the stator 2 .

In addition, the protection structure 8 can also directly wrap each coil lead wire or each lead wire group 26 composed of the coil lead wires. As shown in Fig. 12, the protective structure 8' directly wraps any of the lead wire groups 26.

The motor 100 also includes a snap ring 91 respectively clamped on the lower shaft portion 32 of the rotating shaft 3 away from the upper end portion 62 and a copper ring located between the snap ring 91 and the lower bearing 72 Set of 92. The lower bearing 33, the copper sleeve 92 and the snap spring 91 cooperate together to realize the fixing of the rotating shaft 3 relative to the mounting seat 1, and also realize the installation of the rotating shaft 31 relative to the mounting base 1. Rotation of seat 1.

The assembly process of the stator 2, the upper bearing 71, the lower bearing 72 and the mounting seat 1 is as follows:

First, along the direction from the connecting portion 63 of the bearing seat 6 to the upper end portion 62, the receiving portion 211 of the stator 2 is sleeved on the lower end portion 61 of the bearing seat 6. On the connecting portion 63 of the bearing housing 6 , the accommodating portion 211 of the stator 2 is respectively abutted against the outer surface of the connecting portion 63 and the outer surface of the extension wall 621 of the upper end portion 62 .

Next, the bearing block 6 equipped with the stator 2 is connected to the support part 5, and the abutment wall 611 of the lower end part 61 of the bearing seat 6 is abutted against the support body 51 Above; the outer surface of the installation wall 612 abuts against the inner surface of the receiving hole 52 of the bracket part 5 .

Again, use a jig to tap the installation wall 612 of the lower end portion 61 . Specifically: use a jig to knock the inner surface of the installation wall 612 facing the lower receiving groove 613, and focus on hitting the inner surface of the installation wall 612 away from the connecting portion 63, forcing the installation wall 611 to be subjected to The inner diameter of the lower receiving groove 613 becomes larger due to force expansion and outward expansion, and finally the installation wall 612 and the receiving hole 52 are fixedly connected by interference fit. In this way, the lower end portion 61 of the bearing seat 6 is clamped in the receiving hole 52 of the bracket portion 5 without loosening. Wherein, the jig is any tool that can strike the lower end portion 61 . Preferably, from one end far away from the connecting portion 63 of the bearing seat 6 to an end close to the connecting portion 63, the inner diameter of the receiving hole 52 is gradually reduced, so that the mounting wall 612 is fastened to the Inside the receiving hole 52. Specifically, the inner surface of the receiving hole 52 is tapered.

Next, press the upper bearing 71 into the upper receiving groove 623 of the upper end portion 62 ; press the lower bearing 72 into the lower receiving groove 613 of the lower end portion 61 . Of course, it is not difficult to understand that the present invention also includes steps such as installing the rotating shaft 3, which are not described in detail within the scope of easy understanding by those skilled in the art.

It should be noted that, in other embodiments, the lower bearing 72 can be pressed into the lower receiving groove 613 of the lower end portion 61 first, and then the lower end portion 61 can be struck with a jig. Wall 612 is installed. Here, the inner surface of the installation wall 612 is separated from the outer surface of the lower bearing 72 by a certain distance, that is, the inner surface of the lower receiving groove 613 is separated by a certain distance from the outer surface of the lower bearing 72, so that The jig extends into the lower receiving groove 613 and hits the installation wall 612 . The lower bearing 72 can be connected with the rotating shaft 3 or the mounting base 1 by relying on the rotating shaft 3 , applying glue in the lower receiving groove 613 or the part of the installation wall 612 that is not knocked. Fixed connection. To facilitate disassembly, it is not easy to use the knocked part of the installation wall 612 to locate the lower bearing 72 . In addition, there is no special sequence requirement for the step of pressing the upper bearing 71 into the upper end portion 62 .

In the motor of the present invention, the support part of the mounting seat is provided separately from the bearing seat, and the stator can be sleeved on the bearing seat from the lower end. The projection of the inner surface of the connecting wall from the connecting part to the direction of the upper end falls into the upper receiving groove, and the projection of the outer surface of the connecting part from the connecting part to the direction of the upper end falls In the outer surface of the upper end, on the premise that the thickness of the upper wall of the upper end is ensured, the upper end may not be limited by the inner diameter of the receiving portion of the stator. At this time, the The inner diameter of the receiving portion may be smaller than the outer diameter of the upper end portion. Compared with the existing design, the inner diameter of the upper receiving groove can be set to be larger, and further, the corresponding upper bearing and/or the upper shaft portion of the rotating shaft can also be larger. Therefore, the overall impact resistance of the motor is improved. Moreover, the motor of the present invention is easy to install and greatly saves cost, and can reduce the cost of 7 yuan in the prior art to about 2 yuan. In the motor according to the embodiment of the present invention, the rotor is the magnetic steel on the outside; the stator is the coil on the inside, and the coil is fixedly connected to the mounting base. In other optional embodiments, the rotor can be the inner coil, the stator can be the outer magnetic steel, and the coil is rotatably connected with the mounting base; or the coil can be used as the outer For the rotor, it is also feasible to use the magnetic steel as the stator inside; or it is also feasible to use the coil as the stator outside and the magnetic steel as the rotor inside.

The above descriptions are only preferred embodiments of the present invention, and the scope of protection of the present invention is not limited to the above embodiments, but all equivalent modifications or changes made by those of ordinary skill in the art according to the disclosure of the present invention should be included within the scope of protection described in the claims.

Claims (7)

1. a kind of motor, it includes mounting seat, and described mounting seat includes cradle portion and the bearing block being connected with described cradle portion, its It is characterised by：Described cradle portion and described bearing block split setting, described bearing block include connecting portion and with described connecting portion phase Connect and the upper end away from described cradle portion, described connecting portion includes connection wall and encloses, by described connection wall, the receiving space setting, Described upper end includes being provided with accepting groove, and the inner surface of described connection wall is from described connecting portion to the throwing in described upper end direction Shadow falls in accepting groove on described, and the outer surface of described connecting portion falls from described connecting portion to the projection in described upper end direction In the outer surface of described upper end, described cradle portion is provided with rack body, and described rack body is provided with accepting hole, described bearing Seat also includes being connected and be inserted in the bottom of described accepting hole with described connection wall.

2. motor as claimed in claim 1 it is characterised in that：Described upper end is also included from described connection wall to away from described Wall extension that the direction of receiving space extends and from described wall extension to the upper wall extending away from the bending of described connection wall, described on Accepting groove is jointly enclosed to set by described wall extension and described upper wall and forms.

3. motor as claimed in claim 1 it is characterised in that：What described motor also included being rotatedly connected with described mounting seat turns Moving axis, the upper shaft part in described upper accepting groove that described rotary shaft includes be inserted in described upper end and be inserted in described connecting portion Described receiving space in lower shaft portion, the external diameter of described upper shaft part is more than the external diameter of described lower shaft portion.

4. motor as claimed in claim 1 it is characterised in that：Described bottom is provided with lower accepting groove, and described motor also includes The upper bearing (metal) being housed in described upper accepting groove and the lower bearing being housed in described lower accepting groove, the external diameter of described upper bearing (metal) is big External diameter in described lower bearing.

5. motor as claimed in claim 4 it is characterised in that：From away from described connecting portion one end near described connecting portion One end, the internal diameter of described accepting hole is gradually reduced.

6. the motor as described in any one of claim 1-5 it is characterised in that：Described motor also includes being fixed on described mounting seat On stator and the rotor with respect to described stator rotation, described stator include at least one pair of coil lead it is characterised in that：Institute State the protection structure that motor also includes below described rotor and be fixed on described mounting seat and/or described stator, described Protection structure is in order to prevent described rotor and described coil lead directly contact.

7. motor as claimed in claim 6 it is characterised in that：Described stator includes the resettlement section of hollow, described resettlement section Internal diameter is less than the external diameter of described upper end.