A stator assembly and an axial field electric machine

Abstract

The application discloses a kind of stator assembly and axial magnetic field motor, the stator assembly includes shell, stator core, coil, pole shoe and stator cover plate, wherein stator core, coil and pole shoe are arranged in the space surrounded by shell and stator cover plate;Coil is arranged in the opening slot of stator core;Pole shoe is fixed on stator cover plate, when stator cover plate and shell butt joint, pole shoe can be arranged at the slot opening of opening slot.The stator core in the application has opening slot, thereby facilitating the installation of coil, at the same time, pole shoe is fixed on stator cover plate, when stator cover plate and shell butt joint, pole shoe and the slot opening of opening slot correspond to each other can reduce the tooth harmonic of motor, reduce the iron loss of motor, improve the efficiency of motor, and reduce the torque ripple of motor.As pole shoe is carried on stator cover plate, in assembly, after directly butt joint stator cover plate and shell, pole shoe can be matched with opening slot, thereby improving the production efficiency of motor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a stator assembly and an axial magnetic field electric machine. BACKGROUND

[0002] The existing automobile driving electric machine has complex operation conditions. Due to the structural characteristics of the electric machine itself, various losses will be generated during the operation of the electric machine, thereby causing the electric machine to heat up. In order to facilitate the installation of the coil, the slot on the stator core is an open slot structure, and a slot wedge is arranged to reduce the degree of air gap harmonics. However, the installation of the slot wedge also increases the production efficiency of the electric machine. Therefore, how to improve the production efficiency of the electric machine has become a technical problem to be solved by the technical personnel in the field. SUMMARY

[0003] Therefore, the present application provides a stator assembly and an axial magnetic field electric machine to solve the technical problem of how to improve the production efficiency of the electric machine.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0005] A stator assembly comprises a shell, a stator core, a coil, a pole shoe and a stator cover plate, wherein the stator core, the coil and the pole shoe are arranged in a space surrounded by the shell and the stator cover plate; the coil is arranged in an open slot of the stator core, and the pole shoe is fixed on the stator cover plate; when the stator cover plate is butted against the shell, the pole shoe can be arranged at a slot opening of the open slot; an outer ring of the stator core and the shell form a first cooling space, and an inner ring of the stator core and the shell form a second cooling space, and the first cooling space and the second cooling space are communicated.

[0006] The shell wall of the shell has an oil inlet cavity and an oil return cavity, the outer wall of the shell has an oil inlet and an oil outlet, the oil inlet is communicated with the oil inlet cavity, and the oil outlet is communicated with the oil return cavity; the inner wall of the shell has an oil injection hole and an oil return hole, the oil injection hole is communicated with the first cooling space and the oil inlet cavity, and the oil return hole is communicated with the first cooling space and the oil return cavity.

[0007] In an embodiment of the present application, the stator cover plate is fixed on the shell by screws, a pressing plate, welding, riveting or dovetail.

[0008] In an embodiment of the present application, the end face of the stator cover plate close to the stator core is provided with a slot rib extending along the radial direction of the stator cover plate and a core tooth slot corresponding to the stator core.

[0009] In one embodiment of the present application, the number of the slot ribs is equal to the number of the open slots of the stator core, and each slot rib is provided with one pole shoe on each side.

[0010] In one embodiment of the present application, the pole shoes extend along the length direction of the stator cover plate, and the length of the pole shoes is equal to the length of the slot opening of the open slots in the radial direction of the stator cover plate.

[0011] In one embodiment of the present application, the width of the slot rib and the pole shoes on both sides of the slot rib is equal to the width of the slot opening of the open slots.

[0012] In one embodiment of the present application, the pole shoes are made of SMC.

[0013] In one embodiment of the present application, the stator cover plate is made of non-magnetic high-strength glass fiber composite material or high-strength plastic.

[0014] In one embodiment of the present application, the coil is a formed coil.

[0015] In one embodiment of the present application, an axial magnetic field motor is also disclosed, which comprises the stator assembly as described in any of the above.

[0016] As can be seen from the above technical solution, the stator core in the present application has open slots, thereby facilitating the installation of the coil, and the pole shoes are fixed on the stator cover plate, so that when the stator cover plate is butted against the shell, the pole shoes corresponding to the slot opening of the open slots can reduce the tooth harmonic of the motor, reduce the iron loss of the motor, improve the efficiency of the motor, and reduce the torque ripple of the motor. Since the pole shoes are carried on the stator cover plate, during assembly, after the stator cover plate and the shell are directly butted, the pole shoes can be matched with the open slots, thereby improving the production efficiency of the motor. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 An exploded structural schematic view of a stator assembly provided by an embodiment of the present application;

[0019] Figure 2 A three-dimensional structural schematic view of a stator assembly provided by an embodiment of the present application;

[0020] Figure 3A stator cover structure schematic diagram provided by an embodiment of the present application;

[0021] Figure 4 A stator core three-dimensional structure schematic diagram provided by an embodiment of the present application;

[0022] Figure 5 A stator core cooling principle schematic diagram provided by an embodiment of the present application;

[0023] Figure 6 A shell three-dimensional structure schematic diagram provided by an embodiment of the present application;

[0024] In the figure, 100 is a shell, 200 is a stator cover, 300 is a stator core, 400 is a coil, 500 is a pole shoe, 600 is a first cooling space, 700 is a second cooling space, 800 is a flow resistance plate,

[0025] 101 is an oil inlet cavity, 102 is an oil return cavity, 103 is an oil inlet, 104 is an oil outlet, 105 is an oil injection hole, 106 is an oil return hole, 201 is a groove rib, 202 is a core tooth groove, 301 is a tooth, and 302 is an open slot. DETAILED DESCRIPTION

[0026] The core of the present application is to provide a stator assembly and an axial magnetic field motor to improve the production efficiency of the motor.

[0027] In addition, the embodiments shown below do not have any limiting effect on the invention content recited in the claims. In addition, the entire content of the configuration represented by the following embodiments is not limited to being necessary as a solution to the invention recited in the claims.

[0028] Please refer to Figures 1 to 6 The stator assembly in the embodiment of the present application comprises:

[0029] The shell 100, the stator core 300, the coil 400, the pole shoe 500, and the stator cover 200, wherein the stator core 300, the coil 400, and the pole shoe 500 are arranged in a space surrounded by the shell 100 and the stator cover 200; the coil 400 is arranged in the open slot 302 of the stator core 300; the pole shoe 500 is fixed on the stator cover 200, and when the stator cover 200 is butted against the shell 100, the pole shoe 500 can be arranged at the slot opening of the open slot 302; the outer ring of the stator core 300 and the shell 100 form a first cooling space 600, the inner ring of the stator core 300 and the shell 100 form a second cooling space 700, and the first cooling space 600 and the second cooling space 700 are communicated;

[0030] The shell wall of the shell 100 has an oil inlet cavity 101 and an oil return cavity 102, the outer wall of the shell 100 has an oil inlet port 103 and an oil outlet port 104, the oil inlet port 103 communicates with the oil inlet cavity 101, and the oil outlet port 104 communicates with the oil return cavity 102; the inner wall of the shell 100 has an oil injection hole 105 and an oil return hole 106, the oil injection hole 105 communicates the first cooling space 600 and the oil inlet cavity 101, and the oil return hole 106 communicates the first cooling space 600 and the oil return cavity 102.

[0031] The stator core 300 in the application has an open slot 302, thereby facilitating the installation of the coil 400, and the pole shoe 500 is fixed on the stator cover plate 200, when the stator cover plate 200 is butted with the shell 100, the pole shoe 500 corresponds to the slot opening of the open slot 302, thereby reducing the tooth harmonic of the motor, reducing the iron loss of the motor, improving the efficiency of the motor, and reducing the torque ripple of the motor. Since the pole shoe 500 is carried on the stator cover plate 200, during assembly, after the stator cover plate 200 and the shell 100 are directly butted, the pole shoe 500 can be matched with the open slot 302, thereby improving the production efficiency of the motor.

[0032] When the stator assembly of the application is used, the cooling oil enters the oil inlet cavity 101 from the oil inlet port 103, and enters the inside of the shell 100 through the oil injection hole 105. The cooling oil in the inside of the shell 100 can directly contact the stator core 300 arranged in the inside of the shell 100. After heat exchange by contact, the cooling oil enters the oil return cavity 102 through the oil return hole 106, and finally flows out from the oil outlet port 104. Since the cooling oil can directly contact and exchange heat with the stator core 300, the cooling efficiency of the motor is improved, and the service life of the motor is prolonged.

[0033] It should be noted that the stator cover plate 200 in the application is fixed on the shell 100 by screws, pressing plates, welding, riveting or dovetail. Correspondingly, the stator cover plate 200 and the shell 100 are provided with mounting holes for mounting screws, workstations for arranging pressing plates, riveting holes, and dovetail structures to realize the fixation of the stator cover plate 200 and the shell 100.

[0034] The stator core 300 has an open slot 302 and a tooth 301, wherein the open slot 302 is used for installing the coil 400, and the open slot 302 is arranged between each tooth. The open slot 302 structure can facilitate the installation of the coil 400, wherein the coil 400 is a formed coil or is sequentially wound on the tooth. The formed coil is a flat copper wire formed coil or a round copper wire pre-wound formed coil.

[0035] The stator cover plate 200 is generally made of non-magnetic high-strength glass fiber composite material or high-strength plastic (for example, PPS, PEEK, etc.). The stator cover plate 200 is provided with a groove rib 201 extending in the radial direction of the stator cover plate 200 and a core tooth groove 202 corresponding to the stator core 300 near the end face of the stator core 300. By providing the groove rib 201 and the core tooth groove 202, the stator cover plate 200 and the shell 100 can be easily aligned. The number of groove ribs 201 is the same as the number of open grooves 302, or different, and the number of groove ribs 201 is equal to the number of open grooves 302 of the stator core 300, which can facilitate the alignment of the stator cover plate 200 and the shell 100. Each groove rib 201 is provided with a pole shoe 500 on both sides, and the pole shoe 500 is attached to both sides of the groove rib 201. The remaining core tooth groove 202 part cooperates with the tooth surface of the whole core. The thickness of the cover plate of the core tooth groove part needs to be as thin as possible to reduce the air gap between the stator and the rotor.

[0036] A stator assembly has a shell, a plurality of stator assemblies can be arranged coaxially, and a plurality of shells 100 are arranged coaxially, that is, the end faces of adjacent shells 100 are in contact with each other.

[0037] Among the two adjacent shells 100, the oil outlet 104 of the former shell 100 is in communication with the oil inlet 103 of the latter shell 100. There are various ways to achieve communication, specifically, the connection can be achieved by external pipeline, or the oil inlet 103 of the former shell 100 and the oil outlet 104 of the latter shell 100 are arranged coaxially. That is, the oil outlet 104 and the oil inlet 103 are both arranged on the end face, and when the two shells 100 are connected, the oil outlet 104 and the oil inlet 103 are in communication.

[0038] Taking two shells 100 as an example, the oil outlet 104 of one of the shells 100 is arranged on the end face, and the oil inlet 103 of the other shell 100 is arranged on the end face. When the two shells 100 are connected, the oil outlet 104 of the former shell 100 is in communication with the oil inlet 103 of the latter shell 100.

[0039] Among the plurality of shells 100, the oil inlet 103 of the shell 100 located at one end and the oil outlet 104 of the shell 100 located at the other end can be located on the end face of the corresponding shell 100, or can be located on the peripheral surface of the corresponding shell 100. Preferably, in order to facilitate the installation of subsequent parts, in the embodiment of the present application, the oil inlet 103 of the shell 100 located at one end and the oil outlet 104 of the shell 100 located at the other end are both arranged on the peripheral surface of the shell 100, and further, the oil inlet 103 of the shell 100 located at one end and the oil outlet 104 of the shell 100 located at the other end are both arranged on the same side.

[0040] In one embodiment of the present application, the pole shoe 500 extends along the length direction of the stator cover plate 200, and the length of the pole shoe 500 is the same as the length of the slot opening of the open slot 302 in the radial direction of the stator cover plate 200.

[0041] In one embodiment of the present application, the width of the slot rib 201 and the pole shoe 500 on both sides of the slot rib 201 is the same as the width of the slot opening of the open slot 302.

[0042] The pole shoe 500 is molded by SMC ferromagnetic powder or other magnetic powder (such as ferrite powder), and the shape is rectangular.

[0043] The present application also discloses an axial magnetic field motor comprising the stator assembly of any one of the above. Since the stator assembly has the above beneficial effects, the axial magnetic field motor comprising the stator assembly also has corresponding effects, which will not be described here.

[0044] The above description of disclosed embodiments enables those skilled in the art to carry out or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A stator assembly comprising a housing, a stator core, a coil, a pole shoe and a stator cover plate, wherein, The stator core, the coil and the pole shoe are arranged in a space surrounded by the shell and the stator cover plate; the coil is arranged in the open slot of the stator core, characterized in that the pole shoe is fixed on the stator cover plate, and when the stator cover plate is butted against the shell, the pole shoe can be arranged at the slot opening of the open slot; the outer ring of the stator core and the shell form a first cooling space, and the inner ring of the stator core and the shell form a second cooling space, and the first cooling space and the second cooling space are communicated; The shell wall of the shell has an oil inlet cavity and an oil return cavity, the outer wall of the shell has an oil inlet and an oil outlet, the oil inlet is communicated with the oil inlet cavity, and the oil outlet is communicated with the oil return cavity; the inner wall of the shell has an oil injection hole and an oil return hole, the oil injection hole communicates the first cooling space and the oil inlet cavity, and the oil return hole communicates the first cooling space and the oil return cavity; The stator cover plate is provided with a slot rib extending along the radial direction of the stator cover plate and a core tooth groove corresponding to the stator core near the end face of the stator core; each slot rib is provided with a pole shoe on both sides, and the sum of the width of the slot rib and the pole shoes on both sides of the slot rib is consistent with the width of the slot opening of the open slot.

2. The stator assembly of claim 1, wherein, The stator cover plate is fixed on the shell by screws, pressing plates, welding, riveting or dovetail.

3. The stator assembly of claim 1, wherein, The number of the slot ribs is equal to the number of the open slots of the stator core.

4. The stator assembly of claim 1, wherein, The pole shoe extends along the length direction of the stator cover plate, and in the radial direction of the stator cover plate, the length of the pole shoe is the same as the length of the slot opening of the open slot.

5. The stator assembly of claim 1, wherein, The pole shoe is made of SMC.

6. The stator assembly of claim 1, wherein, The stator cover plate is made of non-magnetic high-strength glass fiber composite material or high-strength plastic.

7. The stator assembly of claim 1, wherein, The coil is a formed coil.

8. An axial field electric machine characterized by The stator assembly comprises the stator assembly according to any one of claims 1 to 7.

Images