CN107171460B

CN107171460B - Stator, motor having the same, and method of manufacturing the same

Info

Publication number: CN107171460B
Application number: CN201610127907.3A
Authority: CN
Inventors: 林嘉伟; 李逸
Original assignee: Johnson Electric SA
Current assignee: Johnson Electric SA
Priority date: 2016-03-07
Filing date: 2016-03-07
Publication date: 2020-03-31
Anticipated expiration: 2036-03-07
Also published as: CN107171460A

Abstract

The invention provides a motor stator, which comprises a stator core and a plurality of stator windings wound on the stator core, wherein the stator core comprises a magnetic yoke and stator teeth corresponding to each stator winding, the stator teeth are connected to the inner wall of the magnetic yoke, the stator also comprises a fixing frame, the fixing frame is formed on the stator teeth through encapsulation molding, and the stator windings are wound on the fixing frame. The invention also provides a motor adopting the motor stator, and the motor is also provided with a rotor, wherein the rotor comprises a rotor core and a rotating shaft fixed relative to the rotor core, and the rotor core is accommodated in the fixed frame and matched with the plurality of stator teeth.

Description

Stator, motor having the same, and method of manufacturing the same

Technical Field

The invention belongs to the field of motors, and particularly relates to a stator of a motor, a motor with the stator and a manufacturing method of the stator.

Background

Motors are devices that convert electrical energy into mechanical energy and have been widely used in various industries. Generally, an electric machine includes a rotor and a stator, and the rotor is driven to rotate relative to the stator by magnetic field interaction between the rotor and the stator. The stator of the motor, such as a brushless motor, includes a stator core and a stator winding, the stator core includes a yoke portion and a plurality of teeth portions extending inward from the yoke portion, winding slots are formed between adjacent teeth portions, and the stator winding is wound around the plurality of teeth portions and is accommodated in the winding slots.

The stator winding is wound on the stator core and needs to be insulated from the stator core. In the existing part of motors, a stator winding is wound on a plurality of tooth parts of a stator core coated with insulating varnish to realize that the stator winding is insulated from the stator core through the insulating varnish, however, the motor has the hidden trouble that the stator winding is directly contacted with the stator core, and each tooth part needs to be wound independently, so that the efficiency is low; in another part of the existing motor, the winding frames are sleeved at the two ends of the stator core, the stator winding is wound on the two winding frames, and then the stator winding is prevented from being in direct contact with the stator core.

Disclosure of Invention

In view of the above, it is desirable to provide a stator having high winding efficiency and easy manufacturing, and a motor having the stator.

The invention provides a motor stator, which comprises a stator core and a plurality of stator windings wound on the stator core, wherein the stator core comprises a magnetic yoke and stator teeth corresponding to each stator winding, the stator teeth are connected to the inner wall of the magnetic yoke, the stator also comprises a fixing frame, the fixing frame is formed on the stator teeth through encapsulation molding, and the stator windings are wound on the fixing frame.

Furthermore, the fixing frame comprises a cylinder wall and winding blocks corresponding to the stator teeth, the winding blocks are arranged on the outer side of the cylinder wall, each stator tooth comprises a tooth part and a pole shoe connected to one end, far away from the magnetic yoke, of the tooth part, the pole shoes are exposed out of the inner side of the cylinder wall and used for being matched with a rotor, each tooth part is contained in one winding block, and each stator winding is wound on one winding block.

Furthermore, each pole shoe is arranged asymmetrically relative to the corresponding tooth part, a groove is formed in one side of each pole shoe, which faces away from the corresponding tooth part, and the stator is used on the single-phase brushless motor.

Furthermore, the cylinder wall and the plurality of winding blocks are integrally formed, and the plurality of stator teeth are connected into a whole through the fixing frame.

Furthermore, the fixing frame also comprises a bottom connected with one end of the cylinder wall, the center part of the bottom is provided with a containing cavity, and a bearing is arranged in the containing cavity.

Furthermore, the fixing frame further comprises a baffle plate arranged at one end, far away from the cylinder wall, of each winding block, the two ends of the baffle plate protrude out of the winding blocks, and the two ends of the baffle plate, the winding blocks and the cylinder wall form winding grooves.

Further, each of the stator teeth is formed by laminating a plurality of magnetic core laminations in the axial direction of the stator.

Further, the yoke is formed by laminating a plurality of core laminations in the axial direction of the stator.

Furthermore, the inner wall of the magnetic yoke is provided with a first clamping groove with an opening corresponding to each stator tooth, the first clamping groove penetrates through two ends of the magnetic yoke along the axial direction of the magnetic yoke, the opening of the first clamping groove gradually shrinks along the direction towards the center of the magnetic yoke, each stator tooth is provided with a clamping protrusion corresponding to one first clamping groove, the clamping protrusion is located at one end, far away from the pole shoe, of the tooth part, and each clamping protrusion is connected with the corresponding first clamping groove in a clamping mode.

Furthermore, the stator further comprises a mounting frame, an annular groove is formed in the peripheral wall of the mounting frame, the magnet yoke is accommodated in the annular groove, a second clamping groove is formed in the end face of one end of the mounting frame corresponding to each first clamping groove, each second clamping groove is communicated with the annular groove, and each card can penetrate through one second clamping groove and can be clamped into the corresponding first clamping groove.

Furthermore, the inner wall of the mounting rack is provided with a containing groove corresponding to each second clamping groove, each containing groove penetrates through two ends of the mounting rack along the axial direction of the mounting rack, the containing groove is communicated with the annular groove and the second clamping grooves, the fixing frame further comprises baffle plates arranged on one side, away from the cylinder wall, of each winding block, and each baffle plate is contained in one containing groove.

Further, the stator also comprises an end cover, the end cover comprises a bottom plate and a side wall, and the end cover is connected with the mounting frame.

Furthermore, a clamping portion is arranged on the end face, provided with the second clamping groove, of the mounting frame, a clamping hook is arranged on the outer side of the tail end of the clamping portion, an accommodating groove is formed in the inner side of the side wall of the end cover corresponding to the clamping portion, a clamping hole communicated with the accommodating groove is formed in the side wall, the clamping portion is accommodated in the accommodating groove, and the clamping hook is clamped into the clamping hole so as to connect the end cover with the mounting frame.

Furthermore, a first fixing part with a through hole is axially arranged on the inner wall of the mounting frame, a second fixing part with a through hole is arranged on the side wall of the end cover corresponding to the first fixing part, and the end cover and the mounting frame are connected through a fixing part penetrating through the through hole of the first fixing part and the through hole of the second fixing part.

Furthermore, the end face, provided with the second clamping groove, of the mounting frame is convexly provided with a plurality of positioning portions, the tail end of the inner side of the side wall of the end cover is provided with positioning grooves corresponding to the positioning portions, and the end cover and the mounting frame are matched and positioned with the positioning portions through the positioning grooves.

Furthermore, a plurality of ventilation grooves are formed in the bottom plate of the end cover.

Furthermore, a boss is convexly arranged on the inner side of the bottom plate of the end cover, and two clamping parts are arranged on the end face of the tail end of the boss and used for clamping a PCB.

Further, this stator still includes the terminal, and the bilateral symmetry of this terminal one end is provided with the connecting portion of buckling in order to be connected with the stator winding that corresponds, and the bilateral symmetry of this terminal other end is buckled to extend and is provided with grafting portion, and this grafting portion is connected with this section of thick bamboo wall.

Furthermore, two sides of each insertion part are provided with barbs.

Furthermore, one end of the cylinder wall is provided with a bulge corresponding to each stator tooth, each bulge is arranged adjacent to one winding block, and the insertion parts of the terminals are inserted in the two adjacent bulges.

The invention also provides a motor adopting the motor stator, which is also provided with a rotor, wherein the rotor comprises a rotor core and a rotating shaft fixed relative to the rotor core, and the rotor core is accommodated in the fixed frame and matched with the plurality of stator teeth.

Furthermore, the rotor also comprises a fan plate, the fan plate is connected with one end of the rotating shaft, and a plurality of blades are arranged on the end face, facing the stator, of one side of the fan plate.

The present invention also provides a stator manufacturing method, including:

providing a plurality of stator teeth;

forming a fixed frame on the plurality of stator teeth in a rubber coating forming mode;

winding a plurality of stator windings on the fixing frame.

Further, each of the stator teeth is formed by laminating a plurality of core laminations in an axial direction of the stator.

Further, the plurality of stator teeth are placed in the same injection mold, and resin is injected into the mold to form the fixing frame.

Further, the stator manufacturing method further includes:

providing a magnetic yoke;

forming a mounting frame on the magnetic yoke in a rubber coating forming mode;

assembling the plurality of stator teeth to the yoke.

Furthermore, a first clamping groove is formed in the magnetic yoke corresponding to each stator tooth, a clamping protrusion is arranged on each stator tooth, and the clamping protrusion on each stator tooth is clamped into the corresponding first clamping groove, so that the plurality of stator teeth are assembled on the magnetic yoke.

According to the motor in the embodiment of the invention, the fixing frame is formed by encapsulating the outer peripheral surfaces of the stator teeth, so that a plurality of stator windings can be wound on the fixing frame outside the magnet yoke at the same time, and the winding efficiency of the stator windings is improved.

Drawings

Fig. 1 is a perspective view of a motor according to a first embodiment of the present invention.

Fig. 2 is an exploded schematic view of the motor shown in fig. 1.

Fig. 3 is an exploded view of the motor shown in fig. 1 in another orientation.

Fig. 4 is an exploded view of the stator core and stator windings shown in fig. 3.

Fig. 5 is an exploded view of the stator teeth and the fixing bracket shown in fig. 3.

Fig. 6 is a schematic cross-sectional view of the stator core and stator windings of fig. 3 taken along line VI-VI.

Fig. 7 is a perspective view of a motor in a second embodiment of the present invention.

Fig. 8 is an exploded view of the motor shown in fig. 7.

Fig. 9 is a perspective view of the mounting bracket shown in fig. 8 in another orientation.

Description of the main elements

The following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, a motor 100 according to a first embodiment of the present invention includes a stator 10 and a rotor 20, wherein the rotor 20 is installed in the stator 10 and can rotate relative to the stator 10.

Referring to fig. 2-3, the stator 10 includes a stator core 11, a stator winding 12 wound around the stator core 11, and an end cover 13. Referring to fig. 4, the stator 10 further includes a mounting frame 40 and a fixing frame 60, and the stator core 11 includes a yoke 30 and stator teeth 50. In the present embodiment, a structure in which the stator core 11 includes four stator teeth 50 will be described as an example. The number of stator teeth 50 is not limited, and in other embodiments, the number of stator teeth 50 may be adjusted according to design requirements.

Referring to fig. 4, the magnetic yoke 30 is substantially annular, and four first slots 31 with openings are uniformly spaced on an inner wall of the magnetic yoke 30, so that the magnetic yoke 30 is respectively connected with the four stator teeth 50 in a clamping manner. The first slot 31 is a dovetail groove, and the width thereof gradually decreases in a direction toward the center of the annular yoke 30. The first engaging groove 31 penetrates both ends of the yoke 30 in the axial direction of the yoke 30.

The mounting bracket 40 is substantially annular, and an annular groove 41 is formed in an outer circumferential wall thereof. The annular groove 41 is used for receiving the yoke 30, so that the yoke 30 is fixed on the mounting frame 40. The inner wall of the mounting frame 40 is uniformly provided with four accommodating grooves 42 at intervals, the accommodating grooves 42 axially penetrate through two end faces of the mounting frame 40 along the mounting frame 40, and the accommodating grooves 42 are communicated with the annular groove 41. The end face of one end of the mounting bracket 40 is provided with four second clamping grooves 43 corresponding to the four first clamping grooves 31, the shapes of the second clamping grooves 43 and the first clamping grooves 31 are the same, and the second clamping grooves 43 are communicated with the annular groove 41 and the accommodating groove 42.

The end surface of the mounting bracket 40, on which the second engaging groove 43 is formed, is also provided with a plurality of arc-shaped positioning portions in a protruding manner. In this embodiment, the end surface of the mounting bracket 40 is provided with a first positioning portion 441, the first positioning portion 441 is located between two adjacent second slots 43, the end surface of the mounting bracket 40 is further provided with another first positioning portion 441 symmetric to the first positioning portion 441, and the another first positioning portion 441 is located between another two adjacent second slots 43; the end surface of the mounting bracket 40 is further provided with two second positioning portions 442 at intervals, a second locking groove 43 is arranged between the two second positioning portions 442 and the first positioning portion 441 at intervals, and the end surface of the mounting bracket 40 is further provided with two second positioning portions 442 symmetrical to the two second positioning portions 442.

A first fixing portion 45 having a through hole is further provided on the inner wall of the mounting bracket 40. The first fixing portion 45 is substantially cylindrical and extends in the axial direction of the mounting bracket 40. In the present embodiment, the number of the first fixing portions 45 is two, and each first fixing portion 45 is disposed adjacent to one first positioning portion 441.

The end surface of the mounting bracket 40, on which the second engaging groove 43 is formed, is further provided with an engaging portion 46, and a wedge-shaped engaging hook 461 is disposed at an outer side of a tail end of the engaging portion 46. In the present embodiment, the number of the locking portions 46 is two, wherein one locking portion 46 is disposed between the two second positioning portions 442, and the other locking portion 46 is symmetrically disposed between the other two second positioning portions 442.

In the present embodiment, the yoke 30 is formed by stacking a plurality of core laminations in the axial direction of the stator 10, and during manufacturing and assembling, the plurality of core laminations are easily riveted to form the yoke 30, and the yoke 30 is encapsulated by injecting plastic or rubber on the outer circumferential surface of the yoke 30 to form the mounting bracket 40, and each first slot 31 is aligned with one second slot 43.

Referring to fig. 5, each stator tooth 50 includes a tooth portion 51, a snap 52, and a pole piece 53. The tooth portion 51 is a substantially square block, and the catching projection 52 and the pole piece 53 are provided at opposite ends of the tooth portion 51, respectively. The locking protrusion 52 is formed in a generally dovetail shape and is inserted into the first locking groove 31 through the second locking groove 43 to lock the stator teeth 50 to the yoke 30.

In the present embodiment, the motor 100 is a single-phase brushless motor, each pole piece 53 is disposed asymmetrically with respect to the corresponding tooth 51, and a groove 531 is formed on a side of the pole piece 53 facing away from the corresponding tooth 51. The asymmetrical tooth 51 and groove 531 design provides a non-uniform air gap between the pole pieces 53 and the rotor core 21, thereby solving the start-up problem of the single-phase brushless motor 100.

The fixing frame 60 has a circular wall 611 and a bottom 612, and the wall 611 and the bottom 612 form a receiving chamber 613. The end of the barrel wall 611 far away from the bottom 612 is connected with a plurality of arc-shaped protrusions 614. In this embodiment, the number of the protrusions 614 is four, and the four protrusions 614 surround the cylinder wall 611 and are uniformly arranged at intervals.

The fixing frame 60 is further provided with a plurality of winding blocks 62 connected with the outer side of the cylinder wall 611 and a baffle 63 located at one end of each winding block 62 far away from the cylinder wall 611, and both ends of the baffle 63 protrude out of the corresponding winding blocks 62. The winding blocks 62 and the baffles 63 are both substantially square, and the number of the winding blocks is four. One end of each baffle 63 forms a winding groove 64 with the corresponding winding block 62 and the corresponding protrusion 614, and the other end of the baffle 63 forms another winding groove 64 with the winding block 62 and the cylinder wall 611.

Referring to fig. 6, the fixing frame 60 has through slots 65 respectively opened toward a winding block 62 and the corresponding baffle 63 on the inner side of the cylinder wall 611, and the through slots 65 have substantially the same shape as the stator teeth 50. When a stator tooth 50 is received in a through slot 65, the pole piece 53 of the stator tooth 50 engages with the inner wall of the cylinder wall 611 to engage with the rotor 20 received in the receiving cavity 613, and the locking projection 52 of the stator tooth 50 exposes the blocking plate 63 to engage with the yoke 30.

In the present embodiment, each stator tooth 50 is formed by laminating a plurality of core laminations in the axial direction of the stator 10, and during manufacturing and assembling, the plurality of core laminations are easily riveted to form the plurality of stator teeth 50, and the plurality of stator teeth 50 are encapsulated by injecting plastic or rubber on the outer circumferential surfaces of the plurality of stator teeth 50 to form the fixing frame 60. The wall 611 of the fixing frame 60, the winding block 62 and the baffle 63 are integrally formed, and the plurality of stator teeth 50 are integrally connected through the fixing frame 60. The inner side of the bottom 612 of the fixing frame 60 near the center of the bottom 612 is provided with a receiving cavity, and the receiving cavity is internally provided with a bearing 66 (refer to fig. 6).

The four winding blocks 62 are respectively wound with four stator windings 12, and each stator winding 12 passes through a corresponding winding slot 64 when being wound.

Referring to fig. 4, the stator 10 further includes a terminal 70. Bent connection portions 71 are symmetrically disposed at two sides of one end of the terminal 70, so that the terminal 70 can be connected to a connection wire (not shown) of the corresponding stator winding 12 to realize connection between the stator windings 12; symmetrical plug-in parts 72 are bent and extended from two sides of the other end of the terminal 70, and the plug-in parts 72 are substantially conical. In this embodiment, the number of the terminals 70 is two, and barbs 721 are symmetrically disposed on both sides of the insertion part 72 of each terminal 70. Two insertion parts 72 of one terminal 70 are inserted into two adjacent protrusions 614, and two insertion parts 72 of the other terminal 70 are inserted into the other two adjacent protrusions 614.

It will be appreciated that the terminals 70 may be secured to the respective projections 614 by over-molding the plug portions 72, with the barbs 721 making the terminals 70 less likely to dislodge from the projections 614.

It is understood that the terminal 70 can be fixed on the corresponding protrusion 614 by the plug part 72 and the plug hole (not shown) on the protrusion 614 in a snap or interference fit manner, and the barb 721 prevents the terminal 70 from being easily released from the protrusion 614.

Referring again to fig. 2-3, the end cap 13 has a bottom plate and sidewalls. A plurality of ventilation slots 131 for heat dissipation are formed in the bottom plate of the end cap 13 from the edge of the bottom plate toward the center of the bottom plate. The inner end of the side wall of the end cap 13 is provided with a ring-shaped positioning slot 132 to facilitate the engagement of the end cap 13 with the positioning portion 44 of the mounting frame 40. The inner end of the side wall of the end cover 13 is provided with a receiving groove 133 corresponding to the positioning portion 46, the side wall of the end cover 13 is further provided with a locking hole 134 communicating with the receiving groove 133, and the locking hole 134 is used for receiving the hook 461 of the positioning portion 46, so as to fix the end cover 13 and the mounting bracket 40. The inner side of the sidewall of the end cap 13 is further provided with a second fixing portion 135 having a through hole corresponding to the first fixing portion 45, and the end cap 13 and the mounting frame 40 can be further fixed by sequentially passing through the through holes of the second fixing portion 135 and the first fixing portion 45 through a fixing member (not shown). In this embodiment, a bearing 14 is further mounted on the side wall of the end cover 13 facing the bottom plate of the end cover 13.

In this embodiment, the motor 100 further includes a PCB board 80. The PCB board 80 is provided with a position sensor, such as a hall sensor, for sensing the position of the rotor, thereby controlling the operation of the motor. Bayonets 81 are symmetrically arranged on two opposite sides of the PCB 80. The inner side of the bottom plate of the end cap 13 is provided with a boss 136 in a protruding manner, and the boss 136 is approximately square. Two clamping parts 137 are symmetrically arranged on the end surface of the boss 136 far away from the bottom plate of the end cover 13. The holding parts 137 are substantially L-shaped, and one ends of the two holding parts 137 are respectively matched with the two bayonets 81 of the PCB 80, so that the PCB 80 is held. The PCB board 80 is connected to an external controller through a wire, so that a position signal sensed by the position sensor is transmitted to the external controller to control an electrical conduction mode of the stator winding 12, thereby controlling the rotation of the motor 100.

The rotor 20 includes a rotor core 21, a rotation shaft 22, and a fan plate 23. The rotor core 21 is a permanent magnet having a substantially cylindrical shape, and the permanent magnet is accommodated in the accommodation chamber 613. The rotor core 21 forms a plurality of axially aligned magnetic poles. The magnetic pole comprises an N pole and an S pole, and the N pole and the S pole are arranged at intervals. The rotating shaft 22 is coaxial with the rotor core 21, and the rotating shaft 22 penetrates through the rotor core 21 and is fixed relative to the rotor core 21. The fan plate 23 is substantially disc-shaped and is located on a side of the stator core 11 remote from the end cover 13. The end surface of the fan plate 23 facing the stator core 11 is provided with a plurality of blades 231, and the blades 231 are annularly arranged. One end of the rotating shaft 22 passes through the bearing 66 mounted on the bottom 612 and the bottom 612, and is connected with the fan plate 23. The other end of the rotating shaft 22 passes through the bearing 14 mounted on the bottom plate of the end cover 13 and the bottom plate of the end cover 13, and serves as an output shaft to be connected with an external load. When the rotating shaft 22 is rotated, the fan plate 23 is driven to rotate, and the motor 100 can be effectively cooled.

Referring to fig. 6, during assembly, plastic or rubber is injected on the outer circumferential surfaces of the four stator teeth 50 and the insertion portions 72 of the two terminals 70 to encapsulate the fixing frame 60, so that the stator teeth 50 are accommodated in the through grooves 65, and the insertion portions 72 of the terminals 70 are fixed in the protrusions 614 of the fixing frame 60; four stator windings 12 are wound on the four winding blocks 62, respectively, and connection wires (not shown) of the four stator windings 12 are connected to the corresponding terminals 70; plastic or rubber is injected on the outer peripheral surface of the magnetic yoke 30 for encapsulation to form the mounting frame 40, the clamping protrusions 52 of the four stator teeth 50 respectively penetrate through the second clamping grooves 43 to be clamped into the corresponding first clamping grooves 31, and the baffle 63 is accommodated in the accommodating groove 42, so that the stator teeth 50, the fixing frame 60, the stator winding 12 and the terminal 70 are fixed on the magnetic yoke 30; the rotor core 21 of the rotor 20 is accommodated in the accommodating cavity 613, and one end of the rotating shaft 22 is installed on the bearing 66 on the bottom 612 and connected with the fan plate 23; then the PCB board 80 is mounted on the boss 136 of the end cover 13, and the other end of the rotating shaft 22 passes through the bearing 14 mounted on the bottom plate of the end cover 13 and the bottom plate of the end cover 13; finally, the positioning groove 132 of the end cap 13 is matched and positioned with the positioning portion of the mounting frame 40, the positioning portion 46 is accommodated in the accommodating groove 133, the hook 461 is matched with the fastening hole 134, and the fixing member is inserted through the threaded holes of the first fixing portion 45 and the second fixing portion 135, that is, the end cap 13 is fixed with the mounting frame 40, thereby completing the assembly.

According to the motor of the embodiment of the invention, the magnet yoke 30 and the stator teeth 50 are separately arranged, and the fixing frame 60 is formed by injecting plastic or rubber on the outer peripheral surface of the stator teeth 50 for encapsulation, so that a plurality of stator windings 12 can be simultaneously wound on the fixing frame 60 outside the magnet yoke 30, and the winding efficiency of the stator windings 12 is improved.

It will be appreciated that the projection 614 and the base 612 may be omitted, and the two winding grooves 64 are formed by the retainer 63, the winding block 62 and the cylindrical wall 611, and the terminal 70 may be connected to the end of the cylindrical wall 611 remote from the base 612.

It is understood that the baffle 63 and the receiving groove 42 can be omitted, and the winding block 62 can directly abut against the inner wall of the mounting frame 40.

It will be appreciated that the connection of the end cap 13 to the mounting bracket 40 is not limited to the connection described in the present embodiment, and may be connected by other means, such as a screw connection.

Referring to fig. 7-8, fig. 7-8 are schematic views of a motor 100' according to a second embodiment of the present invention. The motor 100 'has the same rotor 20', yoke 30 ', stator teeth 50', fixing frame 60 'and PCB board 80' as in the first embodiment, except that: the mounting 40' is different in structure from the mounting 40 of the first embodiment.

Referring to fig. 9, the mounting bracket 40 'includes a mounting portion 41' and a receiving portion 42 'at one end of the mounting portion 41', and the mounting portion 41 'and the receiving portion 42' are integrally formed. The yoke 30 'is mounted on the mounting part 41', and the mounting frame 40 'is formed by injection molding plastic or rubber coating on the outer circumferential surface of the yoke 30'. The mounting portion 41 'is substantially annular and has an annular groove 411' formed in an outer peripheral wall thereof. The annular groove 411 'is used for receiving the yoke 30' so that the yoke 30 'is fixed on the mounting bracket 40'. Four accommodating grooves 412 ' are uniformly arranged on the inner wall of the mounting portion 41 ' at intervals, the accommodating grooves 412 ' penetrate through the inner wall of the mounting portion 41 ' along the axial direction of the mounting portion 41 ', and the accommodating grooves 412 ' are communicated with the annular groove 411 '. The inner side of one end of the mounting portion 41 'far away from the accommodating portion 42' is provided with four second engaging grooves 413 ', the shapes of the second engaging grooves 413' and the first engaging grooves 31 'are the same, and the second engaging grooves 413' are communicated with the annular groove 411 'and the accommodating groove 412'. The receiving portion 42 ' has a bottom plate and a side wall, and the bottom plate of the receiving portion 42 ' is disposed away from the mounting portion 41 '. The inner side of the bottom plate of the accommodating portion 42 ' is convexly provided with a boss 421 ', and the boss 421 ' is approximately square. Two clamping parts 422 'are symmetrically arranged on the end surface of the tail end of the boss 421'. The retainers 422 'are substantially "L" shaped, and one ends of the two retainers 422' are respectively matched with the two bayonets 81 'of the PCB 80' to fix the PCB 80 'relative to the mounting frame 40'. The bottom plate center of the accommodating part 42' is provided with an accommodating cavity, and a bearing is arranged in the accommodating cavity.

In the present embodiment, the fan wheel 23 ' is mounted on the side of the accommodating portion 42 ' away from the mounting portion 41 '.

The stator manufacturing method in the embodiment of the present invention will be further described below.

A plurality of stator teeth 50 are provided. Specifically, each of the stator teeth 50 is formed by laminating a plurality of core laminations in the axial direction of the stator.

A fixing bracket 60 is formed on the plurality of stator teeth 50 by over-molding. Specifically, the plurality of stator teeth 50 are placed in the same injection mold, and resin is injected into the mold to form the fixing frame 60.

A plurality of stator windings 12 are wound around the stator holder 60.

A yoke 30 is provided. Specifically, the yoke 30 is formed by laminating several core laminations in the axial direction of the stator.

A mounting bracket 40 (40') is formed on the yoke 30 by over-molding.

The plurality of stator teeth 50 are assembled to the yoke 30.

It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that suitable changes and modifications of the above embodiments are within the scope of the claimed invention as long as they are within the spirit and scope of the present invention.

Claims

1. The utility model provides an electric motor stator, includes stator core and around locating a plurality of stator winding on this stator core, this stator core includes yoke and the stator tooth that corresponds with each this stator winding, and this a plurality of stator teeth are connected in the inner wall of this yoke, its characterized in that: the stator also comprises a fixed frame which is formed on the plurality of stator teeth through encapsulation molding, the plurality of stator windings are wound on the fixed frame,

the stator comprises a stator frame, a stator yoke, a stator core and a stator, wherein the stator yoke is provided with a magnetic yoke inner wall, the stator yoke inner wall is provided with a first clamping groove with an opening corresponding to each stator tooth, the first clamping groove penetrates through two ends of the magnetic yoke along the axial direction of the magnetic yoke, the opening of the first clamping groove gradually shrinks along the direction towards the center of the magnetic yoke, each stator tooth comprises a tooth part, a pole shoe arranged at one end of the magnetic yoke and a clamping protrusion arranged at one end of the tooth part far away from the pole shoe, each clamping protrusion is connected with the corresponding first clamping groove in a clamping mode, the stator further comprises a mounting frame, an annular groove is formed in the outer peripheral wall of the mounting frame, the magnetic yoke is accommodated in the annular groove, a second clamping groove is formed in the end face of one end of the mounting.

2. The motor stator of claim 1, wherein: the fixing frame comprises a cylinder wall and winding blocks corresponding to the stator teeth, the winding blocks are arranged on the outer side of the cylinder wall, a pole shoe of each stator tooth is arranged at one end, far away from the magnetic yoke, of the stator tooth, the pole shoes are exposed out of the inner side of the cylinder wall and used for being matched with a rotor, each tooth part is contained in one winding block, and each stator winding is wound on one winding block.

3. The motor stator of claim 2, wherein: each pole shoe is arranged asymmetrically relative to the corresponding tooth part, one side of each pole shoe, which is far away from the corresponding tooth part, is provided with a groove, and the stator is used on the single-phase brushless motor.

4. The motor stator of claim 2, wherein: the wall of the fixing frame and the plurality of winding blocks are integrally formed, and the plurality of stator teeth are connected into a whole through the fixing frame.

5. The motor stator of claim 2, wherein: the fixing frame also comprises a bottom connected with one end of the cylinder wall, the central part of the bottom is provided with a containing cavity, and a bearing is arranged in the containing cavity.

6. The motor stator of claim 2, wherein: the fixing frame also comprises a baffle plate which is arranged at one end of each winding block far away from the cylinder wall, the two ends of the baffle plate protrude out of the winding block, and the two ends of the baffle plate, the winding block and the cylinder wall form a winding groove.

7. The motor stator of claim 1, wherein: each of the stator teeth is formed by laminating a plurality of magnetic core laminations in the axial direction of the stator.

8. The motor stator of claim 1, wherein: the yoke is formed by laminating a plurality of core laminations in the axial direction of the stator.

9. The motor stator of claim 1, wherein: the inner wall of the mounting rack is provided with a containing groove corresponding to each second clamping groove, each containing groove penetrates through two ends of the mounting rack along the axial direction of the mounting rack, the containing groove is communicated with the annular groove and the second clamping grooves, the fixing rack further comprises baffle plates arranged on one side, far away from the cylinder wall, of each winding block, and each baffle plate is contained in one containing groove.

10. The motor stator of claim 1, wherein: the stator also includes an end cap including a bottom plate and a sidewall, the end cap being connected with the mounting bracket.

11. The motor stator of claim 10, wherein: the end face of the mounting frame, on which the second clamping groove is formed, is provided with a clamping portion, the outer side of the tail end of the clamping portion is provided with a clamping hook, the inner side of the side wall of the end cover, corresponding to the clamping portion, is provided with an accommodating groove, the side wall is provided with a clamping hole communicated with the accommodating groove, the clamping portion is accommodated in the accommodating groove, and the clamping hook is clamped into the clamping hole so as to connect the end cover with the mounting frame.

12. The motor stator of claim 10, wherein: the inner wall of the mounting frame is axially provided with a first fixing part with a through hole, the side wall of the end cover is provided with a second fixing part with a through hole corresponding to the first fixing part, and the end cover and the mounting frame are connected through a fixing piece penetrating through the through hole of the first fixing part and the through hole of the second fixing part.

13. The motor stator of claim 10, wherein: the end face, provided with the second clamping groove, of the mounting frame is convexly provided with a plurality of positioning parts, the tail end of the inner side of the side wall of the end cover is provided with positioning grooves corresponding to the positioning parts, and the end cover and the mounting frame are positioned in a matched mode through the positioning grooves and the positioning parts.

14. The motor stator of claim 10, wherein: a plurality of ventilation grooves are formed in the bottom plate of the end cover.

15. The motor stator of claim 10, wherein: the inner side of the bottom plate of the end cover is convexly provided with a boss, and the end face of the tail end of the boss is provided with two clamping parts which are used for clamping a PCB.

16. The motor stator of claim 2, wherein: the stator further comprises a terminal, wherein bent connecting parts are symmetrically arranged on two sides of one end of the terminal to be connected with corresponding stator windings, inserting parts are symmetrically bent and extended on two sides of the other end of the terminal and connected with the cylinder wall.

17. The electric machine stator of claim 16, wherein: barbs are arranged on two sides of each insertion part.

18. The electric machine stator of claim 16, wherein: one end of the cylinder wall is provided with a bulge corresponding to each stator tooth, each bulge is arranged adjacent to one winding block, and the insertion parts of the terminals are inserted in the two adjacent bulges.

19. An electrical machine employing the stator of any one of claims 1 to 18, the electrical machine further comprising a rotor including a rotor core and a shaft fixed relative to the rotor core, the rotor core being received in the mounting bracket and cooperating with the plurality of stator teeth.

20. The electric machine of claim 19, wherein: the rotor also comprises a fan plate, the fan plate is connected with one end of the rotating shaft, and a plurality of blades are arranged on the end face, facing the stator, of one side of the fan plate.