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 stator shell, stator core, coil, pole shoe and stator cover plate, stator core, coil and pole shoe are arranged in the space formed by stator 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 stator shell butt joint, pole shoe can be arranged at the slot opening of opening slot.The stator core in the application has opening slot, which facilitates the installation of the coil, at the same time, the pole shoe is fixed on the stator cover plate, when the stator cover plate and the stator shell butt joint, the pole shoe corresponding to the slot opening of the opening slot 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 shoe is carried on the stator cover plate, during assembly, after directly butt jointing the stator cover plate and the stator shell, the pole shoe can be matched with the opening slot, thereby improving the production efficiency of the 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, and various losses will be generated in the operation process of the electric machine due to the structural characteristics 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 of 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] In view of this, the technical problem to be solved by the present application is how to improve the production efficiency of the electric machine. To this end, the present application provides a stator assembly and an axial magnetic field electric machine.

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

[0005] A stator assembly comprises a stator 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 stator shell and the stator cover plate; the coil is arranged in an 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 stator shell, the pole shoe can be arranged at a slot opening of the open slot, and the stator shell is provided with an oil inlet and an oil outlet; an outer ring of the stator core and the stator shell surround a first cooling space, and an inner ring of the stator core and the stator shell surround a second cooling space.

[0006] The first cooling space is provided with N first flow resistance plates, and a plurality of the first flow resistance plates separate the first cooling space into N outer ring cooling areas; the second cooling space is provided with M second flow resistance plates, and a plurality of the second flow resistance plates separate the second cooling space into M inner ring cooling areas, wherein N-M=1, the second flow resistance plates and the first flow resistance plates are arranged alternately; the inner ring cooling area is in communication with two adjacent outer ring cooling areas, and the M inner ring cooling areas, the N outer ring cooling areas and the corresponding oil guide grooves sequentially guide to form a cooling cycle, the outer ring cooling area at the beginning of the cooling cycle is in communication with the oil inlet, and the outer ring cooling area at the end of the cooling cycle is in communication with the oil outlet.

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

[0008] In one embodiment of the present application, the stator cover plate is provided with groove ribs extending along the radial direction of the stator cover plate and core slots corresponding to the stator core near the end face of the stator core.

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

[0010] In one embodiment of the present application, the pole shoe extends along the length direction of the stator cover plate, and the length of the pole shoe in the radial direction of the stator cover plate is the same as the length of the slot opening of the open slot.

[0011] In one embodiment of the present application, the sum of the width of the groove rib and the pole shoe on both sides of the groove rib is consistent with the width of the slot opening of the open slot.

[0012] In one embodiment of the present application, the pole shoe is 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 according to any one of the above.

[0016] As can be seen from the above technical solution, the stator core in the present application has an open slot, thereby facilitating the installation of the coil. Meanwhile, the pole shoe is fixed on the stator cover plate, and when the stator cover plate is butted against the stator shell, the pole shoe corresponding to the slot opening of the open slot 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 shoe is carried on the stator cover plate, during assembly, after the stator cover plate and the stator shell are directly butted, the pole shoe can be matched with the open slot, 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 1An exploded structural schematic diagram of a stator assembly provided by an embodiment of the present application;

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

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

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

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

[0023] In the figure, 100 is a stator housing, 200 is a stator cover plate, 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 first baffle, and 900 is a second baffle;

[0024] 101 is an oil inlet, 102 is an oil outlet, 201 is a groove rib, 202 is a core tooth slot, 301 is a tooth, 302 is an open slot, 601 is a first outer ring cooling area, 602 is a second outer ring cooling area, 603 is a third outer ring cooling area, 604 is a fourth outer ring cooling area, 701 is a first inner ring cooling area, 702 is a second inner ring cooling area, and 703 is a third inner ring cooling area. DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] Please refer to Figures 1 to 5 The stator assembly in the embodiment of the present application comprises:

[0028] The stator shell 100, the stator core 300, the coil 400, the pole shoe 500 and the stator cover plate 200, wherein the stator core 300, the coil 400 and the pole shoe 500 are arranged in the space surrounded by the stator shell 100 and the stator cover plate 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 plate 200, and when the stator cover plate 200 is butted with the stator shell 100, the pole shoe 500 can be arranged at the slot opening of the open slot 302; the stator shell 100 is provided with an oil inlet 101 and an oil outlet 102; the outer ring of the stator core 300 and the stator shell 100 form a first cooling space 600, and the inner ring of the stator core 300 and the stator shell 100 form a second cooling space 700;

[0029] The first cooling space 600 is provided with N first flow resistance plates 800, and the plurality of first flow resistance plates 800 separate the first cooling space 600 into N outer ring cooling areas; the second cooling space 700 is provided with M second flow resistance plates 900, and the plurality of second flow resistance plates 900 separate the second cooling space 700 into M inner ring cooling areas, wherein N-M=1, the second flow resistance plates 900 are arranged alternately with the first flow resistance plates 800; the inner ring cooling area is communicated with the two adjacent outer ring cooling areas, the M inner ring cooling areas, the N outer ring cooling areas and the corresponding oil guide grooves form a cooling cycle in sequence, the outer ring cooling area at the first end of the cooling cycle is communicated with the oil inlet 101, and the outer ring cooling area at the last end of the cooling cycle is communicated with the oil outlet 102.

[0030] The stator core 300 in the application has an open slot 302, thereby facilitating the installation of the coil 400, and at the same time, the pole shoe 500 is fixed on the stator cover plate 200, and when the stator cover plate 200 is butted with the stator 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 stator 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.

[0031] The cooling oil enters the outer ring cooling area at the first end of the cooling cycle from the oil inlet 101, enters the corresponding inner ring cooling area from the outer ring cooling area through the oil guide groove 103, enters the corresponding outer ring cooling area from the inner ring cooling area through the oil guide groove 103, and finally enters the outer ring cooling area at the last end of the cooling cycle through the oil guide groove 103 and flows out from the oil outlet 102. During the cooling cycle, the cooling oil can directly contact and exchange heat with the stator core 200 during the flow in the outer ring cooling area and the inner ring cooling area, thereby improving the cooling efficiency of the motor and prolonging the service life of the motor.

[0032] It should be noted that the stator cover plate 200 in the present application is fixed on the stator shell 100 by screws, pressing plates, welding, riveting or dovetail. Corresponding mounting holes for mounting screws, workstations for setting pressing plates, riveting holes and dovetail structures are provided on the stator cover plate 200 and the stator shell 100 to realize the fixation of the stator cover plate 200 and the stator shell 100.

[0033] The stator core 300 has open slots 302 and teeth 301, wherein the open slots 302 are used for mounting coils 400, and each tooth has an open slot 302 therebetween. The structure of the open slots 302 can facilitate the installation of the coils 400. The coils 400 are formed coils or are sequentially wound on the teeth. The formed coils are flat copper wire formed coils or round copper wire pre-wound formed coils.

[0034] The stator cover plate 200 is generally made of non-magnetic high-strength glass fiber composite material or high-strength plastic (such as PPS, PEEK, etc.). The end surface of the stator cover plate 200 close to the stator core 300 is provided with groove ribs 201 extending in the radial direction of the stator cover plate 200 and core tooth grooves 202 corresponding to the stator core 300. The groove ribs 201 and the core tooth grooves 202 can facilitate the alignment of the stator cover plate 200 and the stator shell 100. The number of groove ribs 201 is the same as or different from the number of open slots 302. When the number of groove ribs 201 is equal to the number of open slots 302 of the stator core 300, the alignment of the stator cover plate 200 and the stator shell 100 can be more facilitated. Each groove rib 201 is provided with a pole shoe 500 on both sides. 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.

[0035] In an embodiment of the present application, the pole shoe 500 extends along the length direction of the stator cover plate 200. In the radial direction of the stator cover plate 200, the length of the pole shoe 500 is the same as the length of the slot opening of the open slot 302.

[0036] In an embodiment of the present application, the sum of the width of the groove rib 201 and the pole shoe 500 located on both sides of the groove rib 201 is consistent with the width of the slot opening of the open slot 302.

[0037] The pole shoe 500 is molded from SMC ferromagnetic powder or other magnetic powder (such as ferrite powder). The outer shape is rectangular.

[0038] The first flow resistance plate 800 and the second flow resistance plate 900 are arranged in the embodiment of the application to make the cooling oil flow along a specific track, so as to prolong the contact time of the cooling oil and the stator core 200, and make the cooling oil contact most of the stator core 200, so that the temperature on the stator core 200 is more uniform.

[0039] For example, as shown in the figure, the four first flow resistance plates 800 divide the first cooling space 600 into four outer ring cooling areas, which are the first outer ring cooling area 601, the second outer ring cooling area 602, the third outer ring cooling area 603 and the fourth outer ring cooling area 604, and the four outer ring cooling areas are arranged in sequence along the circumference, wherein the first outer ring cooling area 601 is located at the first end of the cooling cycle, the fourth outer ring cooling area 604 is located at the end of the cooling cycle, the first outer ring cooling area 601 is communicated with the oil inlet 101, and the fourth outer ring cooling area 604 is communicated with the oil outlet 102. Figure 3

[0040] The three second flow resistance plates 900 divide the second cooling space 700 into three inner ring cooling areas, which are the first inner ring cooling area 701, the second inner ring cooling area 702 and the third inner ring cooling area 703.

[0041] The cooling oil enters the first outer ring cooling area 601 through the oil inlet 101, then enters the first inner ring cooling area 701 from the first outer ring cooling area 601, then enters the second outer ring cooling area 602 from the first inner ring cooling area 701, then enters the second inner ring cooling area 702 from the second outer ring cooling area 602, then enters the third outer ring cooling area 603 from the second inner ring cooling area 702, then enters the third inner ring cooling area 703 from the third outer ring cooling area 603, then enters the fourth outer ring cooling area 604 from the third inner ring cooling area 703, and finally flows out from the oil outlet 102, to complete a cooling cycle.

[0042] The above is only an example of N=4 and M=3, and the embodiment of the application is not limited to the above form. As long as the first flow resistance plate 800 and the second flow resistance plate 900 can form a specific track for circulating cooling, the setting form is within the protection scope of the application.

[0043] ​The stator assembly comprises one stator housing or a plurality of stator housings 100, when comprising a plurality of stator housings 100, one stator core 200 is installed on each stator housing 100. The plurality of stator housings 100 can be two stator housings 100, three stator housings 100, four stator housings 100, etc. The plurality of stator housings 100 are coaxially arranged, that is, the end faces of adjacent stator housings 100 are in contact with each other. The number of stator housings 100 can be determined according to the size of the output power. The oil outlet of the front stator housing and the oil inlet of the rear stator housing are in communication.

[0044] The oil outlet 102 of one stator housing 100 and the oil inlet 101 of the other stator housing 100 are in communication in the adjacent two stator housings 100. The connection can be made through an external pipeline, or the oil inlet 101 of one stator housing 100 and the oil outlet 102 of the other stator housing 100 are coaxially arranged. That is, the oil outlet 102 and the oil inlet 101 are arranged on the end face, and when the two stator housings 100 are connected, the oil outlet 102 and the oil inlet 101 are automatically connected.

[0045] Taking two stator housings 100 as an example, the oil outlet 102 of one stator housing 100 is arranged on the end face, and the oil inlet 101 of the other stator housing 100 is arranged on the end face. When the two stator housings 100 are connected, the oil outlet 102 of the front stator housing 100 is in communication with the oil inlet 101 of the rear stator housing 100.

[0046] In the plurality of stator housings 100, the oil inlet 101 of the stator housing 100 at one end and the oil outlet 102 of the stator housing 100 at the other end can be located on the end face of the corresponding stator housing 100, or on the circumferential surface of the corresponding stator housing 100. Preferably, in order to facilitate the installation of subsequent parts, in the embodiment of the application, the oil inlet 101 of the stator housing 100 at one end and the oil outlet 102 of the stator housing 100 at the other end are arranged on the circumferential surface of the stator housing 100, and further, the oil inlet 101 of the stator housing 100 at one end and the oil outlet 102 of the stator housing 100 at the other end are arranged on the same side.

[0047] The 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.

[0048] The foregoing description of the disclosed embodiments enables a person skilled in the art to make or use the application. Modifications of these embodiments will occur to persons of skill in the art, and that the appended claims are intended to cover all such modifications that do not depart from the true spirit and scope of the application. Therefore, the application is not limited to the embodiments shown but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A stator assembly comprising a stator 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 stator 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 stator shell, the pole shoe can be arranged at the slot opening of the open slot; the stator shell is provided with an oil inlet and an oil outlet; the outer ring of the stator core and the stator shell surround a first cooling space, and the inner ring of the stator core and the stator shell surround a second cooling space; The first cooling space is provided with N first flow resistance plates, and the plurality of first flow resistance plates separate the first cooling space into N outer ring cooling areas; the second cooling space is provided with M second flow resistance plates, and the plurality of second flow resistance plates separate the second cooling space into M inner ring cooling areas, wherein N-M=1, the second flow resistance plates are arranged alternately with the first flow resistance plates; the inner ring cooling area is in communication with the two adjacent outer ring cooling areas, and the M inner ring cooling areas, the N outer ring cooling areas and the corresponding oil guide grooves sequentially guide to form a cooling cycle, the outer ring cooling area at the beginning of the cooling cycle is in communication with the oil inlet, and the outer ring cooling area at the end of the cooling cycle is in communication with the oil outlet; The pole shoe is made of magnetically conductive powder by molding.

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

3. The stator assembly of claim 2, wherein, The stator cover plate is provided with a groove rib extending in the radial direction of the stator cover plate and a core tooth groove corresponding to the stator core at the end face close to the stator core.

4. The stator assembly of claim 3, wherein, The number of groove ribs is equal to the number of open slots of the stator core, and each groove rib is provided with a pole shoe on both sides.

5. The stator assembly of claim 3, 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.

6. The stator assembly of claim 3, wherein, The width of the groove rib and the pole shoe on both sides of the groove rib is consistent with the width of the slot opening of the open slot.

7. The stator assembly of claim 6, wherein, The pole shoe is made of SMC.

8. 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.

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

10. An axial field electric machine characterized by The stator assembly comprises the stator assembly according to any one of claims 1 to 9.

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