CN111725907A - A stator assembly and an axial magnetic field motor - Google Patents

Abstract

The invention discloses a stator assembly and an axial magnetic field motor. The stator assembly includes a casing, a stator iron core, a coil, a pole shoe and a stator cover, wherein the stator iron core, the coil and the pole shoe are arranged on the casing and the stator. In the space enclosed by the cover plate; the coil is arranged in the open slot of the stator core; the pole piece is fixed on the stator cover plate, when the stator cover plate and the shell are butted, the pole piece can be arranged at the notch of the open slot . In the present invention, the stator iron core has an open slot, so as to facilitate the installation of the coil, and at the same time, the pole piece is fixed on the stator cover. Reduce the tooth harmonics 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 piece is carried on the stator cover, during assembly, after the stator cover and the casing are directly connected, the pole piece can be matched with the opening slot, thereby improving the production efficiency of the motor.

Description

A stator assembly and an axial magnetic field motor

technical field

The present invention relates to the technical field of motors, and more particularly, to a stator assembly and an axial magnetic field motor.

Background technique

The operating conditions of the existing automobile drive motors are complex, and due to the structural characteristics of the motor itself, various losses will occur during the operation of the motor, thereby causing the motor to heat up. In order to improve the convenience of installing the coil, the slot on the stator core is an open slot structure, and the degree of air gap harmonics is reduced by setting slot wedges. However, the installation of the slot wedge increases the production efficiency of the generator at the same time. Therefore, how to improve the production efficiency of the motor has become an urgent technical problem to be solved by those skilled in the art.

SUMMARY OF THE INVENTION

In view of this, the technical problem to be solved by the present invention is how to improve the production efficiency of the motor. For this reason, the present invention provides a stator assembly and an axial magnetic field motor.

To achieve the above object, the present invention provides the following technical solutions:

A stator assembly includes a casing, a stator core, a coil, a pole piece and a stator cover, wherein the stator core, the coil and the pole piece are arranged on the casing and the stator cover The coil is arranged in the open slot of the stator core, the pole piece is fixed on the stator cover, and when the stator cover is butted with the casing, the The pole piece can be arranged at the notch of the open slot; the outer ring of the stator core and the casing enclose a first cooling space, and the inner ring of the stator core and the casing enclosing a second cooling space, the first cooling space communicates with the second cooling space;

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

In an embodiment of the present invention, the stator cover is fixed on the housing by screws, pressing plates, welding, riveting or dovetails.

In an embodiment of the present invention, an end face of the stator cover plate close to the stator iron core is provided with a slot rib extending in a radial direction of the stator cover plate and an iron core tooth slot corresponding to the stator iron core.

In an embodiment of the present invention, the number of the slot ribs is equal to the number of the open slots of the stator iron core, and one of the pole pieces is provided on both sides of each slot rib.

In an embodiment of the present invention, the pole piece extends along a length direction of the stator cover, and in the radial direction of the stator cover, the length of the pole piece is the same as the length of the notch of the open slot same.

In one embodiment of the present invention, the sum of the widths of the slot rib and the pole pieces located on both sides of the slot rib is the same as the width of the notch of the open slot.

In an embodiment of the present invention, the pole piece is fabricated from SMC.

In an embodiment of the present invention, the stator cover plate is made of non-magnetic high-strength glass fiber composite material or high-strength plastic.

In one embodiment of the present invention, the coils are formed coils.

In an embodiment of the present invention, an axial magnetic field motor is also disclosed, including the stator assembly described in any one of the above.

It can be seen from the above technical solutions that the stator iron core in the present invention has an open slot, so as to facilitate the installation of the coil, and at the same time, the pole piece is fixed on the stator cover. When the stator cover is butted with the housing, the pole piece Corresponding to the notch of the open slot, the tooth harmonics of the motor can be reduced, the iron loss of the motor can be reduced, the efficiency of the motor can be improved, and the torque ripple of the motor can be reduced at the same time. Since the pole piece is carried on the stator cover, during assembly, after the stator cover and the housing are directly connected, the pole piece can be matched with the opening slot, thereby improving the production efficiency of the motor.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that are used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative efforts.

1 is a schematic diagram of an exploded structure of a stator assembly provided by an embodiment of the present invention;

2 is a schematic three-dimensional structure diagram of a stator assembly provided by an embodiment of the present invention;

3 is a schematic structural diagram of a stator cover plate provided by an embodiment of the present invention;

FIG. 4 is a schematic three-dimensional structure diagram of a stator core provided by an embodiment of the present invention;

5 is a schematic diagram of a cooling principle of a stator core provided by an embodiment of the present invention;

FIG. 6 is a schematic three-dimensional structural diagram of a casing provided by an embodiment of the present invention;

In the figure, 100 is the casing, 200 is the stator cover, 300 is the stator core, 400 is the coil, 500 is the pole piece, 600 is the first cooling space, 700 is the second cooling space, 800 is the spoiler,

101 is the oil inlet cavity, 102 is the oil return cavity, 103 is the oil inlet, 104 is the oil outlet, 105 is the fuel injection hole, 106 is the oil return hole, 201 is the groove rib, 202 is the iron core tooth slot, 301 is a tooth, 302 is an open slot.

Detailed ways

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

In addition, the embodiments shown below do not have any limiting effect on the content of the invention described in the claims. In addition, the whole content of the structure shown in the following embodiment is not limited to what is necessary for the solution of the invention described in the claim.

Please refer to FIG. 1 to FIG. 6 , the stator assembly in the embodiment of the present invention includes:

The casing 100 , the stator core 300 , the coil 400 , the pole piece 500 and the stator cover 200 , wherein the stator core 300 , the coil 400 and the pole piece 500 are arranged in the space enclosed by the casing 100 and the stator cover 200 The coil 400 is arranged in the opening slot 302 of the stator iron core 300; The outer ring of the stator core 300 and the casing 100 enclose a first cooling space 600, and the inner ring of the stator core 300 and the casing 100 enclose a second cooling space 700, the first cooling space 600 communicates with the second cooling space 700;

The shell wall of the casing 100 has an oil inlet cavity 101 and an oil return cavity 102, and the outer wall of the casing 100 has an oil inlet 103 and an oil outlet 104. The oil inlet cavity 101 is in communication, the oil outlet 104 is in communication with the oil return cavity 102; the inner wall of the housing 100 has an oil injection hole 105 and an oil return hole 106, and the oil injection hole 105 is in communication The first cooling space 600 and the oil inlet cavity 101 and the oil return hole 106 communicate with the first cooling space 600 and the oil return cavity 102 .

In the present invention, the stator core 300 has an open slot 302, so as to facilitate the installation of the coil 400. At the same time, the pole piece 500 is fixed on the stator cover 200. When the stator cover 200 is connected to the housing 100, the pole piece 500 is connected to the stator cover 200. The notch of the open slot 302 can correspondingly reduce the tooth harmonics of the motor, reduce the iron loss of the motor, improve the efficiency of the motor, and at the same time reduce the torque ripple of the motor. Since the pole piece 500 is carried on the stator cover 200, during assembly, after the stator cover 200 and the housing 100 are directly connected, the pole piece 500 can be matched with the opening slot 302, thereby improving the production efficiency of the motor.

When the stator assembly of the present invention is adopted, the cooling oil enters the oil inlet cavity 101 from the oil inlet 103, and enters the inside of the casing 100 through the oil injection hole 105. The cooling oil entering the inside of the casing 100 can be combined with the cooling oil provided in the casing. The stator iron core 300 inside the 100 is in direct contact, and after heat exchange through the contact, the cooling oil enters the oil return cavity 102 through the oil return hole 106 and finally flows out through the oil outlet 104 . Since the cooling oil can directly contact the stator iron core 300 for heat exchange, the cooling efficiency of the motor is improved and the service life of the motor is prolonged.

It should be noted that the stator cover plate 200 in the present invention is fixed on the casing 100 by screws, pressing plates, welding, riveting or dovetail. The corresponding stator cover plate 200 and the casing 100 are provided with mounting holes for installing screws, positions for setting the pressing plate, riveting holes, and a dovetail structure to realize the fixation of the stator cover plate 200 and the casing 100 .

The stator core 300 has an open slot 302 and teeth 301, wherein the open slot 302 is used for installing the coil 400, and each tooth has an open slot 302. By setting the open slot 302 structure, the installation of the coil 400 can be facilitated. 400 are formed coils, or wound on the teeth in turn. The forming coil is a flat copper wire forming coil, or a forming coil pre-wound with round copper wire.

The stator cover plate 200 is generally composed of a non-magnetic high-strength glass fiber composite material or a high-strength plastic (eg, PPS, PEEK, etc.). The end face of the stator cover plate 200 close to the stator iron core 300 is provided with groove ribs 201 extending in the radial direction of the stator cover plate 200 and core tooth slots 202 corresponding to the stator iron core 300 . The positioning of the stator cover 200 and the casing 100 can be facilitated by arranging the slot ribs 201 and the iron core tooth slots 202 . The number of the slot ribs 201 is the same as the number of the opening slots 302, or different, and the number of the slot ribs 201 is equal to the number of the opening slots 302 of the stator core 300, which can facilitate the alignment of the stator cover 200 and the casing 100. . A pole piece 500 is disposed on both sides of each slot rib 201 , the pole piece 500 is pasted on both sides of the slot rib 201 , and the remaining iron core tooth slot 202 is matched with the tooth surface of the whole iron core. The thickness of the cover plate of the groove part of the iron core teeth needs to be as thin as possible to reduce the air gap between the stator and the rotor.

A stator assembly has a casing, a plurality of stator assemblies can be arranged coaxially, and a plurality of casings 100 are arranged coaxially, that is, the end faces of adjacent casings 100 are abutted against the end faces.

In the two adjacent casings 100 , the oil outlet 104 of the former casing 100 communicates with the oil inlet 103 of the latter casing 100 . There are various specific ways to achieve the communication. Specifically, the connection can be made through a peripheral pipeline, or the oil inlet 103 of the former casing 100 and the oil outlet 104 of the latter casing 100 are arranged coaxially. That is, the oil outlet 104 and the oil inlet 103 are both disposed on the end face, and when the two housings 100 are butted against each other, the oil outlet 104 and the oil inlet 103 are self-conducting.

Taking two casings 100 as an example, the oil outlet 104 of one casing 100 is arranged on the end face, and the oil inlet 103 of the other casing 100 is arranged on the end face. The oil outlet 104 of the body 100 communicates with the oil inlet 103 of the latter casing 100 .

Among the multiple casings 100 , the oil inlet 103 of the casing 100 at one end and the oil outlet 104 of the casing 100 at the other end may be located on the end face of the corresponding casing 100 , or may be located on the corresponding surface of the casing 100 . on the circumference. Preferably, in order to facilitate the installation of subsequent components, in the embodiment of the present invention, the oil inlet 103 of the casing 100 at one end and the oil outlet 104 of the casing 100 at the other end are both provided on the peripheral surface of the casing 100 Furthermore, the oil inlet 103 of the casing 100 at one end and the oil outlet 104 of the casing 100 at the other end are provided on the same side.

In one embodiment of the present invention, the pole piece 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 piece 500 is the same as the length of the slot of the opening slot 302 .

In an embodiment of the present invention, the sum of the widths of the slot rib 201 and the pole pieces 500 located on both sides of the slot rib 201 is the same as the width of the notch of the opening slot 302 .

The pole piece 500 is molded from SMC ferromagnetic powder or other magnetically conductive powder (eg, ferrite powder), and has a rectangular outline.

The present invention also discloses an axial magnetic field motor, comprising the stator assembly according to any one of the above. Since the above-mentioned stator assembly has the above beneficial effects, the axial magnetic field motor including the above-mentioned stator assembly also has corresponding effects, which will not be repeated here.

The above description of the disclosed embodiments enables any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. 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 enclosed 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 and can be arranged at the notch of the open slot when the stator cover plate is butted with the shell; a first cooling space is defined by the outer circular ring of the stator core and the shell, a second cooling space is defined by the inner circular ring of the stator core and the shell, and the first cooling space is communicated with the second cooling space;

an oil inlet cavity and an oil return cavity are formed in the wall of the shell, an oil inlet and an oil outlet are formed in the outer wall of the shell, the oil inlet is communicated with the oil inlet cavity, and the oil outlet is communicated with the oil return cavity; the oil injection hole and the oil return hole are formed in the inner wall of the shell, 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.

2. The stator assembly of claim 1 wherein the stator cover plate is secured to the housing by screws, clamps, welding, rivets or dovetails.

3. The stator assembly of claim 2, wherein the end surface of the stator cover plate near the stator core is provided with a slot rib extending along a radial direction of the stator cover plate and a core slot corresponding to the stator core.

4. The stator assembly of claim 3 wherein the number of slot ribs is equal to the number of open slots of the stator core, one pole shoe being disposed on each side of each slot rib.

5. The stator assembly of claim 3, wherein the pole pieces extend along a length of the stator cover plate, the pole pieces having a length in a radial direction of the stator cover plate that is the same as a length of the slots of the open slots.

6. The stator assembly of claim 3, wherein a sum of widths of the slot ribs and the pole shoes on both sides of the slot ribs coincides with a width of the slots of the open slots.

7. The stator assembly of claim 6, wherein the pole pieces are machined from SMC.

8. The stator assembly of claim 1 wherein the stator cover plate is machined from a non-magnetically permeable high strength fiberglass composite or a high strength plastic.

9. The stator assembly of claim 1, wherein the coils are shaped coils.

10. An axial field machine comprising a stator assembly according to any of claims 1 to 9.

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