CN212114995U - Fixed plate structure and motor comprising same - Google Patents

Abstract

The utility model discloses a fixing plate structure and a motor containing the fixing plate, which comprises a fixing plate main body, and a supporting part and a polar claw which are connected with the fixing plate main body, wherein the fixing plate main body is suitable for supporting a gear assembly; the supporting part is suitable for supporting the cover plate; the pole claw is suitable for extending into the stator assembly and is used for providing an electromagnetic field; the circumference side of fixed plate main part has the cutting face of stepping down relative with the wiring mouth of casing, is close to the circumference outer fringe of the fixed plate main part of the cutting face of stepping down is equipped with and is suitable for to support the flange of the medial surface of casing. The utility model discloses an in the circumference outer fringe setting of fixed plate main part with the flange that the medial surface of casing offseted makes core radial positioning more accurate, solves original fixed plate and follows casing wiring mouth and warp and rise outward to lead to the frictional problem of polar claw and rotor magnetic ring on the fixed plate.

Description

Fixed plate structure and motor comprising same

Technical Field

The utility model relates to a motor design field especially relates to a fixed plate structure and contain motor of this fixed plate, specifically is used for permanent magnet gear motor, step motor.

Background

Permanent magnetism slows down synchronous, step motor has advantages such as efficient, the reliable operation owing to adopted permanent magnet excitation, it is extensive to use in small-size motor, permanent magnetism gear motor is by the casing, the rotor, stator module (stator module includes coil skeleton and the winding on the coil skeleton), the claw polar plate, the fixed plate, the gear assembly, parts such as apron are constituteed, wherein the fixed plate provides the polar claw downwards in the motor and is used for the electromagnetism part, upwards bear gear drive, supporting part and apron cooperation simultaneously, play the effect that the axial compresses tightly the stator. The following problems exist in the installation process of the motor structure in the prior art:

(1) the permanent magnet speed reducing synchronous stepping motor has several structures, and the general motor has one U-shaped notch in the casing and one wire outlet box in the notch to lead out connecting wire for the motor. According to the existing shell stamping process, after a cutter cuts a U-shaped notch, stress at the notch position is released, and two sides of the notch are expanded to a certain degree. Because the fixed plate is radial to be fixed a position with the contact of casing inner wall, casing incision deformation that rises outward can lead to the fixed plate to carry out the skew to the direction of deformation, and the fixed plate position takes place the skew back, and the utmost point claw of fixed plate below can take place the friction with high-speed rotatory rotor to it is bad to lead to the motor to send the friction noise, and serious probably leads to the motor card to die not to operate.

(2) The permanent magnet speed reduction synchronous stepping motor framework adopts an injection molding process, the framework can shrink to a certain extent after being demoulded, and the outer edge of the shrunk framework can deform downwards to a certain extent (namely deform towards the direction far away from the fixed plate); simultaneously, the fixed plate is matched on the framework, the upper part of the fixed plate can be riveted with a cover plate, the cover plate is supported by two supporting parts on the fixed plate, and the cover plate exerts an axial force on the fixed plate to ensure that the motor stator assembly is axially compressed. But because the outer edge of the framework deforms downwards, the fixed plate cannot be completely pressed on the framework after being stressed, so that the axial direction of the stator assembly is not completely pressed, and obvious current sound noise can appear when the motor runs at the moment.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem that the motor among the prior art leads to assembling not compact because of easy inner structure warp, the utility model provides a fixed plate structure and contain the motor of this fixed plate and solve above-mentioned problem.

The utility model provides a fixed plate structure, which comprises a fixed plate main body, and a supporting part and a polar claw which are connected with the fixed plate main body, wherein the fixed plate main body is suitable for supporting a gear component of a motor; the supporting part is suitable for supporting a cover plate of the motor; the pole claw is suitable for extending into a stator assembly of the motor and is used for providing an electromagnetic field; the circumference side of the fixed plate main body is provided with a yielding cutting surface opposite to the wiring port of the casing, and a flange suitable for abutting against the inner side surface of the casing of the motor is arranged on the circumference outer edge of the fixed plate main body close to the yielding cutting surface.

Further, the support portion and the pole claw extend from the surface of the fixing plate main body to both sides in the axial direction.

Furthermore, the flange is provided with two or more, and the flange distributes in the both sides of abdicating the cutting face.

Preferably, the flanges are provided in two, and the two flanges are symmetrically arranged with respect to a mirror plane of the connection port.

Preferably, the minimum circumferential angle a between the center of each flange and the wiring port of the housing is 20-40 °.

Preferably, the minimum circumferential angle a between the center of each flange and the wiring port of the housing is 30 °.

Furthermore, a plurality of axial protruding parts suitable for jacking the coil framework are uniformly distributed on the end face of the fixing plate main body facing to the extending direction of the polar claws.

Further, the distance between each axial bulge and the outer edge of the fixing plate main body is 5-6 mm.

Furthermore, the tail end of the supporting part is provided with a protrusion inserted with the cover plate, and a first notch is formed in the end face of the supporting part connected with the two sides of the protrusion.

Furthermore, the outer edge of the fixing plate main body connected with the two sides of the supporting part is provided with a second notch which is inwards sunken in the radial direction.

Furthermore, a first pressing rib is arranged at the joint of the side surface of the supporting part facing the rotor shaft and the fixing plate main body.

Furthermore, a second pressing rib is arranged at the joint of the side surface of the polar claw facing the rotor shaft and the fixing plate main body.

The utility model also provides a motor, which comprises a casing, a cover plate covering one end of the casing, a gear assembly, a stator assembly, a rotor and the fixing plate structure, wherein the gear assembly, the stator assembly and the rotor are positioned in the casing; the rotor is in transmission connection with the gear assembly, the stator assembly is located on the circumferential outer side of the rotor, and the fixing plate structure is located between the stator assembly and the cover plate in the axial direction.

The utility model has the advantages that:

(1) fixed plate structure and motor, the circumference outer fringe setting of fixed plate main part with the flange that the medial surface of casing offsets makes stator module radial positioning more accurate, solves original fixed plate and follows casing wiring mouth and warp and rise outward to lead to the frictional problem of polar claw and rotor magnetic ring on the fixed plate.

(2) Fixed plate structure and motor, the equipartition has a plurality of axial bulge that are suitable for roof pressure coil skeleton in the fixed plate main part for compensate skeleton shrink and warp, thereby make core axial positioning precision higher, solve among the original motor structure skeleton shrink outward flange and warp downwards, lead to stator module axial to press not tight, thereby the problem of production current noise.

(3) Fixed plate structure and motor, first notch and second notch all are located the root of supporting part, and stamping cutter need not make the right angle like this, to the requirement greatly reduced of stamping forming cutter, when reducing the technology degree of difficulty, improve the life-span of cutter.

(4) Fixed plate structure and motor, first ribbing and second ribbing can improve the rigidity of supporting part, utmost point claw, make more perpendicular behind its turn-ups. The perpendicularity of the polar claw is improved, and the friction between a rotor magnetic ring and the polar claw caused by the inward inclination of the polar claw can be avoided, so that noise is generated. The supporting part perpendicularity is improved, the axial compression of the stator can be guaranteed, and the resonance noise caused by the incompact compression of the stator is avoided.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a perspective view (from above) of a specific embodiment of a retaining plate structure according to the present invention;

fig. 2 is a perspective view (from above) of a specific embodiment of the retaining plate structure of the present invention;

FIG. 3 is an enlarged view at M in FIG. 2;

FIG. 4 is a schematic view of the location of the flange according to the present invention;

FIG. 5 is a perspective view (from the side) of a particular embodiment of a retaining plate structure according to the present invention;

fig. 6 is an assembly view of the cover plate and the fixing plate structure according to the present invention;

fig. 7 is a perspective view (from below) of a specific embodiment of a retaining plate structure according to the present invention;

FIG. 8 is a perspective view of a specific embodiment of a mounting plate structure according to the present invention

Fig. 9 is an exploded view of the motor of the present invention;

fig. 10 is an assembly view of the motor of the present invention;

fig. 11 is a perspective view of the housing of the present invention;

fig. 12 is a schematic view of the assembly relationship between the fixing plate main body and the coil bobbin in the present invention.

In the figure, 1, a machine shell, 101, a wiring port, 2, a rotor, 3, a stator assembly, 301, a coil framework, 4, a fixed plate structure, 401, a fixed plate main body, 4011, a abdicating cutting surface, 4012, a shaft hole, 402, a supporting part, 4021, a protrusion, 403, a pole claw, 404, a flange, 405, a hollowed hole, 406, an axial bulge, 407, a first notch, 408, a second notch, 409, a first pressing rib, 410, a second pressing rib, 5, a gear assembly, 6, a cover plate, 601, a notch, 7, a circuit board, 8, an outlet box, 9, a connecting wire, 10, an output shaft, 11 and a rotor shaft.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the present invention, the term "up" of the indicated orientation or position relationship means that the end of the motor close to the motor output shaft 10 after the motor assembly is completed, i.e. the end close to the cover plate; the term "lower" in the indicated orientation or positional relationship refers to the end of the motor near the input shaft of the motor, i.e., the end near the rotor, after assembly of the motor is completed.

Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The utility model provides a fixing plate structure, which comprises a fixing plate main body 401, and a supporting part 402 and a pole claw 403 which are connected with the fixing plate main body 401, wherein the fixing plate main body 401 is suitable for supporting a gear component 5 of a motor; the support 402 is adapted to support the cover plate 6 of the motor; the pole piece 403 is adapted to extend into the stator assembly 3 of the electrical machine for providing an electromagnetic field; the circumferential side surface of the fixing plate main body 401 has a relief cutting surface 4011 opposite to the wiring port 101 of the casing 1, and the circumferential outer edge of the fixing plate main body 401 near the relief cutting surface 4011 is provided with a flange 404 adapted to abut against the inner side surface of the casing 1. The fixing plate main body 401 is arranged between the rotor 2 and the cover plate 6, serves as a mounting substrate for the supporting part 402 and the pole claws 403, and is used for supporting the gear assembly 5 above, the pole claws 403 integrally connected to the fixing plate main body 401 extend into the stator assembly 3, the pole claws 403 are located in the radial gap between the stator assembly 3 and the rotor 2, so that the distance between magnetic poles is reduced, the magnetic field distribution is more concentrated, and the magnetic field intensity is improved. The supporting part 402 is matched with the cover plate 6, so that the problem of fixing between the fixing plate main body 401 and an adjacent part is solved, and the influence on the working efficiency of the motor caused by relative movement between the parts is avoided. Let a bit cut face 4011 just right with the wiring mouth 101 of casing 1, let out installation space for outlet box 8, and guarantee that casing 1 can surround fixed plate structure 4, simultaneously, because there is a certain degree of external rising in the wiring mouth 101 both sides of casing 1, consequently the utility model discloses an outer fringe at the fixed plate main part 401 that is close to let a bit cut face 4011 sets up flange 404 to the increase lets a bit cut near fixed plate main part 401's of face 4011 radial dimension, makes fixed plate main part 401 and casing 1 tight-fit, avoids fixed plate structure 4 to casing 1's deformation direction skew, realizes fixed plate structure 4's accurate positioning.

The flanges 404 are preferably provided with two or more than two, and the flanges 404 are distributed on two sides of the abdicating cutting surface 4011, at this time, the inner side surfaces of the casing 1 on two sides of the wiring port 101 are in pressing contact with the flanges 404, so that the fixing plate main body 401 is tightly fitted with the casing 1 when the center of the fixing plate main body 401 does not deviate. The flange 404 is added on the basis of the original fixing plate structure 4, the shape of the fixing plate main body 401 is not required to be specially designed, and the manufacturing process is simple.

Example 1:

a fixing plate structure 4, as shown in fig. 1 to 3, includes a fixing plate main body 401, and a support portion 402 and a pole piece 403 attached to the fixing plate main body 401, the fixing plate main body 401 being adapted to support a gear assembly 5; the support 402 is adapted to support the cover plate 6; the pole piece 403 is adapted to extend into the stator assembly 3 for providing an electromagnetic field; the circumferential side surface of the fixing plate main body 401 has a relief cutting surface 4011 opposite to the wiring port 101 of the casing 1, and the circumferential outer edge of the fixing plate main body 401 near the relief cutting surface 4011 is provided with a flange 404 adapted to abut against the inner side surface of the casing 1.

The fixing plate main body 401 is formed by cutting an abdicating cutting surface 4011 from a circular thin plate side, a shaft hole 4012 suitable for the rotor shaft 11 to pass through is formed in the center of the fixing plate main body 401, the rotor 2 is in transmission connection with the gear assembly 5, the abdicating cutting surface 4011 is a plane, and the supporting portion 402 and the pole claws 403 are integrally arranged on the fixing plate main body 401. The stationary plate body 401 is formed by stamping a galvanized steel sheet, and a burr surface is formed on a fracture surface after stamping, and preferably, the burr surface of the flange 404 is located on the upper surface of the stationary plate body 401 to prevent the burr surface from rubbing against the end surface of the rotor 2.

Support portion 402: the supporting portions 402 extend upward along the axial direction of the motor, that is, extend toward the cover plate 6, and are used for being clamped and fixed with the cover plate 6, the supporting portions 402 are preferably arranged in an array at the outer edge of the fixing plate main body 401, at this time, the supporting portions 402 can be clamped in the circumferential gap between the cover plate 6 and the housing 1, as shown in fig. 5, 6 and 9, the ends of the supporting portions 402 have protrusions 4021 (the ends refer to the ends far away from the fixing plate main body 401), the outer edge of the cover plate 6 is provided with notches 601 which are in inserted fit with the protrusions 4021, and after the protrusions 4021 are inserted into the notches 601, the protrusions 4021 are clamped.

The pole claw 403: the pole claws 403 extend downwards along the axial direction of the motor, namely extend towards the direction of the rotor 2, and because the pole claws 403 need to extend into the cavity at the center of the coil framework 301 to form an intensive magnetic field, the distance between the pole claws 403 and the rotor shaft 11 is small, the pole claws 403 are positioned in the middle of the panel of the fixing plate main body 401, the pole claws 403 are cut out from the panel of the fixing plate main body 401 and then bent downwards, and hollow holes 405 are formed in the panel of the fixing plate main body 401, the shape of the hollow holes 405 is the shape of the pole claws 403, so that the integral manufacturing and forming are facilitated, and the overall weight of the motor can be reduced.

In this embodiment, two flanges 404 are provided, and the two flanges 404 are symmetrically arranged with respect to the mirror plane of the wire connection port 101. Due to the symmetry of the structure of the casing 1, the casing 1 is often symmetrically deformed relative to the mirror plane of the wire connection port 101 when expanding and deforming, and when the two flanges 404 are symmetrically arranged relative to the mirror plane of the wire connection port 101, the contact area between the fixing plate main body 401 and the casing 1 can be increased to the maximum extent, and the matching is firmer. The axis of symmetry of the relief cutting surface 4011 lies in the mirror plane of the port 101, and the flange 404 is also symmetrically disposed about the axis of symmetry of the relief cutting surface 4011 (as shown in fig. 1).

If the distance between the flange 404 and the wire connection port 101 is too close, the outward expansion phenomenon of the housing 1 on both sides of the wire connection port 101 is aggravated; if the distance between the flange 404 and the wire connection port 101 is too long, the gap between the surface of the housing 1 on both sides of the wire connection port 101 and the fixing plate main body 401 is too large, the contact area between the housing 1 and the fixing plate main body 401 is reduced, and the fitting firmness is reduced. For this reason, it is preferable that the minimum circumferential angle a of the center of each flange 404 with respect to the wire connection port 101 of the housing 1 is 20 ° to 40 ° (as shown in fig. 4). In one embodiment of the present invention, the center of each flange 404 has a minimum circumferential angle a of 30 ° with the wiring port 101 of the housing 1. The minimum circumferential angle a is the circumferential angle formed by the center of the flange 404 and the edge of the wire connection port 101 closest to the flange 404.

Example 2:

a fixing plate structure 4, which is modified based on embodiment 1 as follows: be provided with first notch 407 on the terminal surface of the supporting part 402 that meets with protruding 4021's both sides, when not setting up first notch 407, protruding 4021 passes through the right angle transition with the lower plane of both sides height, and is higher to stamping tool's requirement, sets up behind first notch 407, passes through the arc slot transition between protruding 4021 and the both sides plane, and stamping tool need not make the right angle like this, to stamping tool's requirement greatly reduced, when reducing the technology degree of difficulty, improves the life-span of cutter. As shown in fig. 2 and 5, the first notch 407 is located at the root bend of the protrusion 4021, so as to eliminate the right angle relationship between the protrusion 4021 and the plane with the lower height at the two sides.

Similarly, the embodiment may also improve the connection portion between the supporting portion 402 and the fixing plate main body 401, and specifically, as shown in fig. 2, the outer edge of the fixing plate main body 401 connected to both sides of the supporting portion 402 has a second notch 408 recessed radially inwards, so as to eliminate the right-angle transition relationship between the supporting portion 402 and the fixing plate main body 401.

Example 3:

the present embodiment is modified based on embodiment 1 or embodiment 2 as follows: a first bead 409 is provided at a connection between the side surface of the support portion 402 facing the rotor shaft 11 and the fixed plate main body 401. As shown in fig. 2, the first rib 409 is located at the joint between the inner root of the support part 402 and the upper surface of the fixing plate main body 401, and the first rib 409 increases the connection area between the support part 402 and the fixing plate main body 401, thereby improving the rigidity of the support part 402 and making the support part 402 more vertical after flanging. The perpendicularity of the supporting portion 402 is improved, the axial compression of the stator can be guaranteed, and resonance noise caused by the fact that the stator is not tightly compressed is avoided.

Similarly, the second bead 410 may be provided at a connection point between the side surface of the pole claw 403 facing the rotor shaft 11 and the fixing plate main body 401. As shown in fig. 7, the second bead 410 is located at the joint between the inner root of the pole claw 403 and the lower surface of the fixing plate main body 401, and the second bead 410 increases the connection area between the pole claw 403 and the fixing plate main body 401, so as to improve the rigidity of the pole claw 403 and make the pole claw 403 more vertical after flanging. The verticality of the pole claws 403 is improved, so that the friction between the magnetic ring of the rotor 2 and the pole claws 403 caused by the inward inclination of the pole claws 403 can be avoided, and the noise is generated.

Example 4:

in addition to embodiment 1, embodiment 2, or embodiment 3, a plurality of axial protrusions 406 adapted to press the bobbin 301 are uniformly distributed on the end surface of the fixing plate body 401 facing the extending direction of the pole piece 403. As shown in fig. 7, 8 and 12, the axial protrusion 406 protrudes downward from the end face of the fixing plate main body 401, and the axial protrusion 406 can compensate for shrinkage deformation of the coil bobbin 301, so that the axial positioning accuracy of the movement is higher.

Since the region where the bobbin 301 contracts and deforms is located near the outer edge thereof, the distance between the axial protrusions 406 and the outer edge of the fixed plate main body 401 cannot be made excessively large, and it is preferable that the distance between each of the axial protrusions 406 and the outer edge of the fixed plate main body 401 be 5mm to 6mm, and the distance between the outer edge of the fixed plate main body 401 in this embodiment be 5 mm.

Example 5:

a motor comprises a machine shell 1, a cover plate 6 covering one end of the machine shell 1, a gear assembly 5, a stator assembly 3, a rotor 2 and a fixing plate structure 4, wherein the gear assembly 5, the stator assembly 3, the rotor 2 and the fixing plate structure are positioned in the machine shell 1, and wiring ports 101 suitable for leading out connecting wires are arranged on the circumferential side surface of the machine shell 1; the rotor 2 is in transmission connection with a gear assembly 5, the stator assembly 3 is located on the circumferential outer side of the rotor 2, and the fixing plate structure 4 is located between the stator assembly 3 and the cover plate 6 in the axial direction.

As shown in fig. 9-11, rotor 2, rotor shaft 11, fixed plate structure 4, gear assembly 5 all is located the inside of casing 1, rotor 2 overlaps on rotor shaft 11, coil skeleton 301 overlaps the periphery at rotor 2, gear assembly 5 is connected with rotor shaft 11 transmission, separate through fixed plate structure 4 between the axial terminal surface of stator module 3 and gear assembly 5, apron 6 lid closes the upper end at gear assembly 5 simultaneously, constitute the shell of motor jointly with casing 1, wiring port 101 is the U type notch, outlet box 8 is installed in wiring port 101, set up circuit board 7 in outlet box 8, connecting wire 9 stretches into behind the outlet box 8 of department and is connected with the lead-out wire of coil. When the fixing device is installed, the pole claws 403 are downward, the fixing plate main body 401 is placed at the axial end of the coil bobbin 301, then the position relation between the flange 404 and the wiring port 101 is adjusted, so that the fixing plate main body 401 is tightly fitted with the casing 1, and then the cover plate 6 is installed, and the supporting part 402 is clamped and fixed with the cover plate 6.

In this specification, the schematic representations of the terms are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (13)

1. A fixation plate structure, characterized in that: comprises a fixing plate main body (401), and a supporting part (402) and a pole claw (403) which are connected with the fixing plate main body (401), wherein the fixing plate main body (401) is suitable for supporting a gear assembly (5) of a motor; the support (402) is adapted to support a cover plate (6) of the electric machine; the pole claw (403) extends into a stator assembly (3) of the motor and is used for providing an electromagnetic field;

the circumference side of fixed plate main part (401) has the face of cutting (4011) of stepping down relative with wiring mouth (101) of casing (1) of motor, is close to the circumference outer fringe of fixed plate main part (401) of the face of cutting (4011) of stepping down is equipped with and is suitable for to be supported flange (404) of the medial surface of casing (1).

2. A fixation plate structure as claimed in claim 1, wherein: the support portion (402) and the pole piece (403) extend from the surface of the fixing plate body (401) to both sides in the axial direction.

3. A fixation plate structure as claimed in claim 1, wherein: the flange (404) is provided with two or more, and the flange (404) distributes in the both sides of abdicating cutting face (4011).

4. A fixation plate structure as claimed in claim 1, wherein: the flanges (404) are provided in two, and the two flanges (404) are symmetrically arranged relative to the mirror plane of the wiring port (101).

5. A fixation plate structure as claimed in claim 1, wherein: the minimum circumferential angle a between the center of each flange (404) and the wiring port (101) of the machine shell (1) is 20-40 degrees.

6. The retaining plate structure of claim 5, wherein: the minimum circumferential angle a between the center of each flange (404) and the wiring port (101) of the machine shell (1) is 30 degrees.

7. A fixation plate structure as claimed in claim 2, wherein: a plurality of axial convex parts (406) suitable for pressing the coil framework (301) are uniformly distributed on the end surface of the fixing plate main body (401) facing to the extending direction of the pole claws (403).

8. The retaining plate structure of claim 7, wherein: the distance between each axial bulge (406) and the outer edge of the fixing plate main body (401) is 5-6 mm.

9. A fixation plate structure as claimed in claim 1, wherein: the tail end of the supporting part (402) is provided with a protrusion (4021) inserted with the cover plate (6), and the end face of the supporting part (402) connected with the two sides of the protrusion (4021) is provided with a first notch (407).

10. A fixation plate structure as claimed in claim 1, wherein: the outer edge of the fixing plate main body (401) connected to both sides of the support part (402) has a second notch (408) recessed radially inward.

11. A fixation plate structure as claimed in claim 1, wherein: a first press rib (409) is arranged at the connection position of the side surface of the supporting part (402) facing the rotor shaft (11) and the fixing plate main body (401).

12. A fixation plate structure as claimed in claim 1, wherein: and a second pressing rib (410) is arranged at the joint of the side surface of the polar claw (403) facing the rotor shaft (11) and the fixing plate main body (401).

13. An electric machine characterized by: the motor comprises a machine shell (1), a cover plate (6) covering one end of the machine shell (1), a gear assembly (5) positioned in the machine shell (1), a stator assembly (3), a rotor (2) and a fixed plate structure (4) according to any one of claims 1 to 12, wherein a wiring port (101) suitable for leading out a connecting wire is arranged on the circumferential side surface of the machine shell (1); the rotor (2) is in transmission connection with the gear assembly (5), the stator assembly (3) is located on the circumferential outer side of the rotor (2), and the fixed plate structure (4) is located between the stator assembly (3) and the cover plate (6) in the axial direction.

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