CN116317221A

CN116317221A - Stator core, motor, electrical apparatus and vehicle

Info

Publication number: CN116317221A
Application number: CN202211534919.XA
Authority: CN
Inventors: 周一恒; 屈欢; 徐飞; 诸自强; 李俊龙; 刘家琦; 李苏宁; 程云峰
Original assignee: Midea Welling Motor Technology Shanghai Co Ltd
Current assignee: Midea Welling Motor Technology Shanghai Co Ltd
Priority date: 2022-12-02
Filing date: 2022-12-02
Publication date: 2023-06-23

Abstract

The invention provides a stator core, a motor, an electric appliance and a vehicle. The stator core includes at least one core segment including a first yoke, a plurality of first teeth shoes, and a plurality of second teeth shoes. The plurality of first tooth parts are connected with the first yoke part and are arranged along the circumferential direction of the first yoke part; the plurality of first tooth shoes are respectively connected with the plurality of first tooth parts; the plurality of second tooth shoes and the plurality of first tooth shoes are alternately arranged along the circumferential direction and are respectively connected with the plurality of first tooth parts; wherein, the first radian of the central angle occupied by the first tooth shoe on one radial section of the stator core is different from the second radian of the central angle occupied by the second tooth shoe on the radial section.

Description

Stator core, motor, electrical apparatus and vehicle

Technical Field

The invention relates to the technical field of motors, in particular to a stator core, a motor, an electric appliance and a vehicle.

Background

Currently, an electric machine includes a stator assembly and a rotor assembly, the stator assembly being capable of driving the rotor assembly in motion. In the related art, an air gap exists between a stator assembly and a rotor assembly, and an air gap magnetic field of a motor has harmonic waves, so that output torque of the motor is reduced.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

To this end, a first aspect of the present invention proposes a stator core.

A second aspect of the invention proposes an electric machine.

A third aspect of the present invention provides an electrical appliance.

A fourth aspect of the invention proposes a vehicle.

In view of this, a first aspect of the present invention provides a stator core comprising at least one core segment, the at least one core segment comprising a first yoke portion, a plurality of first tooth portions, a plurality of first tooth shoes, and a plurality of second tooth shoes. The plurality of first tooth parts are connected with the first yoke part and are arranged along the circumferential direction of the first yoke part; the plurality of first tooth shoes are respectively connected with the plurality of first tooth parts; the plurality of second tooth shoes and the plurality of first tooth shoes are alternately arranged along the circumferential direction and are respectively connected with the plurality of first tooth parts; wherein, the first radian of the central angle occupied by the first tooth shoe on one radial section of the stator core is different from the second radian of the central angle occupied by the second tooth shoe on the radial section.

In this solution, the stator core comprises at least one core segment, i.e. the stator core is formed of core segments. The at least one core segment includes a first yoke, a plurality of first teeth shoes, and a plurality of second teeth shoes. The plurality of first teeth are connected with the first yoke and arranged along the circumferential direction of the first yoke to achieve the mounting between the plurality of first teeth and the first yoke. The plurality of second tooth shoes and the plurality of first tooth shoes are alternately arranged along the circumference and are respectively connected with the plurality of first tooth parts, namely two second tooth shoes are arranged at two sides of each first tooth shoe along the axial direction, and two first tooth shoes are arranged at two sides of each second tooth shoe along the axial direction so as to realize the arrangement of the plurality of first tooth shoes and the plurality of second tooth shoes. The first radian of the central angle occupied by the first tooth shoes on one radial section of the stator core is different from the second radian of the central angle occupied by the second tooth shoes on the radial section, namely, the length of each first tooth shoe along the circumferential direction is different from the length of each second tooth shoe along the circumferential direction.

Specifically, compared with a mode that harmonic waves exist in an air gap magnetic field of a motor to reduce output torque of the motor, the method can reduce the influence of the harmonic waves of the air gap magnetic field of the motor on the output torque of the motor by arranging the first tooth shoes and the second tooth shoes which are alternately arranged in the circumferential direction and by arranging the first tooth shoes and the second tooth shoes in different central angles corresponding to the first tooth shoes and the second tooth shoes, so that the output torque of the motor is prevented from being reduced by reducing the harmonic waves of the air gap magnetic field of the motor.

In addition, the stator core in the technical scheme provided by the invention can also have the following additional technical characteristics:

in one aspect of the invention, the first arc is less than the second arc.

In the technical scheme, the first radian is smaller than the second radian, and the first radian is smaller than the second radian, namely the length of each first tooth shoe along the circumferential direction is smaller than the length of each second tooth shoe along the circumferential direction, so that the air-gap magnetic field fundamental wave can be kept unchanged while the air-gap magnetic field harmonic wave of the motor is reduced in such a way, and negative effects caused by the harmonic wave are restrained to the greatest extent.

In one technical scheme of the invention, the first radian is more than or equal to PI/Ns and less than or equal to 5/3 xPI/Ns; PI is PI, and NS is the number of slots of the stator core.

In the technical scheme, the first radian is greater than or equal to PI/Ns and less than or equal to 5/3 xPI/Ns, the circumferential length of each first tooth shoe in the plurality of first tooth shoes is adjusted by adjusting the first radian, PI/Ns to 5/3 xPI/Ns are set as the first radian, PI is PI, NS is the number of slots of a stator core, and therefore the first radian is within the range, and air gap magnetic field harmonic waves of a motor can be effectively reduced.

In one technical scheme of the invention, the second radian is more than or equal to 7/3PI/Ns and less than or equal to 3 xPI/Ns; PI is PI, and NS is the number of slots of the stator core.

In the technical scheme, the second radian is greater than or equal to 7/3PI/Ns and less than or equal to 3 xPI/Ns, the circumferential length of each second tooth shoe in the plurality of second tooth shoes is adjusted by adjusting the size of the second radian, and the motor air gap magnetic field harmonic wave can be effectively reduced by setting the second radian to 7/3PI/Ns to 3 xPI/Ns, wherein PI is PI and NS is the number of slots of the stator core, so that the second radian is in the range.

In one aspect of the invention, at least one core segment includes a first core segment and a second core segment. The second core segment is axially disposed with the first core segment.

In this technical scheme, at least one section iron core section includes first iron core section and second iron core section, and stator core is sectional type iron core promptly, and second iron core section is arranged along the axial with first iron core section to make first iron core section and second iron core section constitute the nail iron core, and adopt the mode of segmentation to be convenient for install stator core.

In one aspect of the present invention, the first tooth shoe of the first core segment is axially opposite the second tooth shoe of the second core segment; the second tooth shoe of the first core segment is axially opposite the first tooth shoe of the second core segment.

In the technical scheme, the first tooth shoe of the first iron core section is opposite to the second tooth shoe of the second iron core section in the axial direction, the second tooth shoe of the first iron core section is opposite to the first tooth shoe of the second iron core section in the axial direction, namely, the first iron core section and the second iron core section are arranged opposite to each other after being installed, and the notch of the stator slot in the first iron core section and the notch of the stator slot in the second iron core section are staggered because the first radian of the central angle occupied by the first tooth shoe on one radial section of the stator core is different from the second radian of the central angle occupied by the second tooth shoe on the radial section. And after the coil of the stator winding is wound on the stator core, the winding is fixed, so that the stability of the stator winding after being installed is improved.

In one aspect of the present invention, the first tooth shoe of the first core segment is axially opposite the first tooth shoe of the second core segment; the second tooth shoe of the first core segment is axially opposite the second tooth shoe of the second core segment.

In this solution, since the first tooth shoe of the first core segment is axially opposite to the first tooth shoe of the second core segment, the second tooth shoe of the first core segment is axially opposite to the second tooth shoe of the second core segment, i.e. the same tooth shoes are oppositely arranged. The same tooth shoes are oppositely arranged in the two iron core sections, so that the notch of a stator slot formed by the first tooth shoe and the second tooth shoe of the first iron core section is communicated with the notch of a stator slot formed by the first tooth shoe and the second tooth shoe of the second iron core section along the axial direction, and the coil of the stator winding is conveniently installed through the notch of the stator slot communicated along the axial direction when the stator winding is installed, and the installation efficiency of the stator winding can be improved.

In one aspect of the present invention, the stator core further includes a third core segment disposed axially with the first core segment between the first core segment and the second core segment.

In this technical scheme, stator core still includes the third iron core section, and the third iron core section is arranged along the axial with first iron core section, is located between first iron core section and the second iron core section, adopts the mode that the third iron core section set up between first iron core section and second iron core section promptly, can weaken the magnetic leakage effectively to promote the efficiency of motor.

In one aspect of the present invention, the third core segment includes a second yoke portion and a plurality of second tooth portions. The plurality of second teeth are connected to the second yoke and arranged in the circumferential direction of the second yoke.

In this technical scheme, the third iron core section includes second yoke portion and a plurality of second tooth portion, and a plurality of second tooth portions are connected with the second yoke portion, arrange along the circumference of second yoke portion to realize the installation of a plurality of second tooth portions, thereby make the stator slot that a plurality of second tooth portions formed can be linked together with the stator slot in the first iron core section, the stator slot in the second iron core section, and then be convenient for install stator winding.

In one aspect of the present invention, the thickness of the third core segment in the axial direction is smaller than the thickness of the first core segment in the axial direction.

In this technical scheme, the third iron core section is less than first iron core section along axial thickness, because the third sets up the third iron core section and is in order to weaken the magnetic leakage, if the thickness of third iron core section is too big, can lead to the fact the influence to the performance of motor, consequently through setting up its thickness to be less than first iron core section along axial thickness to can reduce the influence that the third iron core section led to the fact the motor performance, guarantee the stability when the motor operates.

In one aspect of the present invention, at least one of the core segments includes a plurality of core blocks arranged circumferentially.

In this solution, at least one of the core segments comprises a plurality of core blocks, which are arranged in the circumferential direction, i.e. the stator core is formed by means of a plurality of core blocks. And when the stator winding is installed by adopting a plurality of iron core blocks, the coil of the stator winding can be wound on the iron core blocks, and then the plurality of iron core blocks are installed after the stator winding is wound, so that the stator winding is more convenient and rapid to install, and the installation efficiency of the stator winding can be improved.

In one aspect of the invention, at least one of the core segments includes a plurality of laminations arranged axially.

In this solution, at least one of the core segments comprises a plurality of laminations, which are arranged in the axial direction, i.e. the stator core in the present application is formed by stacking a plurality of laminations in the circumferential direction.

The second aspect of the present invention provides an electric machine, including the stator core in any of the foregoing aspects, so that the electric machine has all the beneficial effects of the stator core, which are not described herein.

The third aspect of the present invention provides an electrical apparatus, including the stator core or the motor in any of the above-mentioned technical solutions, so that the electrical apparatus has all the beneficial effects of the stator core and the motor, which are not described herein again.

A fourth aspect of the present invention provides a vehicle, including the stator core or the motor in any of the above aspects, so that the vehicle has all the advantages of the stator core and the motor, which are not described herein.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is one of schematic views of a stator core according to an embodiment of the present invention;

FIG. 2 is one of the schematic views of a second tooth shoe according to one embodiment of the invention;

FIG. 3 is one of the schematic views of a first tooth shoe according to one embodiment of the invention;

FIG. 4 is one of the schematic diagrams of an electric machine according to one embodiment of the invention;

FIG. 5 is a second schematic view of a stator core according to an embodiment of the present invention;

fig. 6 is a schematic view of a first core segment according to one embodiment of the invention;

fig. 7 is a schematic view of a second core segment according to one embodiment of the invention;

FIG. 8 is a second schematic diagram of an electric machine according to an embodiment of the present invention;

fig. 9 is a third schematic view of a stator core according to an embodiment of the present invention;

fig. 10 is a schematic view of a third core segment according to one embodiment of the invention;

FIG. 11 is a schematic view of a second yoke according to one embodiment of the invention;

FIG. 12 is a third schematic illustration of an electric machine according to an embodiment of the present invention;

FIG. 13 is a second schematic view of a second tooth shoe in accordance with an embodiment of the invention;

FIG. 14 is a second schematic view of a first tooth shoe in accordance with an embodiment of the invention;

fig. 15 is a schematic view of a rotor core according to an embodiment of the present invention;

FIG. 16 is a schematic diagram of rotational speed versus torque of an electric machine according to one embodiment of the present disclosure;

fig. 17 is a schematic diagram of the relationship between the rotational speed and the efficiency of the motor according to an embodiment of the present invention.

Wherein, the correspondence between the reference numerals and the component names in fig. 1 to 17 is:

100 stator core, 200 core segments, 210 first core segment, 220 second core segment, 230 third core segment, 232 second yoke, 234 second tooth, 240 first yoke, 250 first tooth, 260 first tooth shoe, 270 second tooth shoe, 280 core block, 300 rotor core, 400 rotor slot.

Detailed Description

In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.

A stator core 100, a motor, an electric appliance, and a vehicle according to some embodiments of the present invention are described below with reference to fig. 1 to 17.

As shown in fig. 1, in one embodiment of the present invention, a stator core 100 is provided that includes at least one core segment 200, the at least one core segment 200 including a first yoke 240, a plurality of first teeth 250, a plurality of first teeth shoes 260, and a plurality of second teeth shoes 270. The plurality of first teeth 250 are connected to the first yoke 240, and are arranged along the circumferential direction of the first yoke 240; the plurality of first teeth shoes 260 are respectively connected with the plurality of first teeth portions 250; the plurality of second teeth shoes 270 and the plurality of first teeth shoes 260 are alternately arranged in the circumferential direction, respectively connected to the plurality of first teeth portions 250; wherein a first radian of a central angle occupied by the first tooth shoe 260 in one radial section of the stator core 100 is different from a second radian of a central angle occupied by the second tooth shoe 270 in the radial section.

In this embodiment, the stator core 100 comprises at least one core segment 200, i.e. the stator core 100 is formed of core segments 200. As shown in fig. 2 and 3, at least one segment 200 includes a first yoke 240, a plurality of first teeth 250, a plurality of first teeth shoes 260, and a plurality of second teeth shoes 270. The plurality of first teeth 250 are connected to the first yoke 240, and are arranged in the circumferential direction of the first yoke 240 to achieve the mounting between the plurality of first teeth 250 and the first yoke 240. The plurality of second teeth shoes 270 and the plurality of first teeth shoes 260 are alternately arranged in the circumferential direction and are respectively connected with the plurality of first teeth portions 250, that is, each first teeth shoe 260 is axially flanked by two second teeth shoes 270, and each second teeth shoe 270 is axially flanked by two first teeth shoes 260, so as to realize arrangement of the plurality of first teeth shoes 260 and the plurality of second teeth shoes 270. The first radian of the central angle occupied by the first tooth shoe 260 on one radial section of the stator core 100 is different from the second radian of the central angle occupied by the second tooth shoe 270 on the radial section, namely, the length of each first tooth shoe 260 along the circumferential direction is different from the length of each second tooth shoe 270 along the circumferential direction.

Specifically, compared with the mode that the output torque of the motor is reduced due to the fact that the harmonic wave exists in the air-gap field of the motor, the first tooth shoes 260 and the second tooth shoes 270 which are alternately arranged are arranged in the circumferential direction, and the central angles corresponding to the first tooth shoes 260 and the second tooth shoes 270 are different, the influence of the harmonic wave of the air-gap field of the motor on the output torque of the motor can be reduced, and accordingly the output torque reduction of the motor is avoided through the mode of reducing the harmonic wave of the air-gap field of the motor.

Specifically, the stator core 100 may be of a unitary, prefabricated strip, block, tooth yoke split structure.

Specifically, the motor further includes a stator winding having a tooth span of 1.

Specifically, in FIG. 1 the first arc is θ ₁ The second radian is theta ₂ 。

The present embodiment provides a stator core 100, which further includes the following technical features in addition to the technical features of the above-described embodiment.

As shown in fig. 1, the first arc is less than the second arc.

In this embodiment, the first arc is smaller than the second arc, and by setting the first arc smaller than the second arc, that is, the length of each first tooth shoe 260 in the circumferential direction is smaller than the length of each second tooth shoe 270 in the circumferential direction, the fundamental wave of the air-gap magnetic field of the motor can be kept substantially unchanged while the harmonic wave of the air-gap magnetic field is reduced, and adverse effects caused by the harmonic wave can be suppressed to the greatest extent.

The first radian is greater than or equal to PI/Ns and less than or equal to 5/3 xPI/Ns; PI is PI, and NS is the number of slots of the stator core 100.

In this embodiment, the first radian is greater than or equal to PI/Ns and less than or equal to 5/3×pi/Ns, by adjusting the size of the first radian to achieve adjustment of the length of each first tooth shoe 260 in the circumferential direction of the plurality of first tooth shoes 260, and by setting the first radian to PI/Ns to 5/3×pi/Ns, where PI is PI and Ns is the number of slots of the stator core 100, so as to achieve that the first radian is within this range, the motor air gap field harmonic can be effectively reduced.

Specifically, the first arc is equal to PI/Ns.

Specifically, the first arc is equal to 5/3 XPI/Ns.

Specifically, the number of slots of the stator core 100 is 8.

The second radian is more than or equal to 7/3PI/Ns and less than or equal to 3 xPI/Ns; PI is PI, and NS is the number of slots of the stator core 100.

In this embodiment, the second radian is greater than or equal to 7/3PI/Ns and less than or equal to 3×pi/Ns, and the second radian is adjusted by adjusting the size of the second radian to achieve adjustment of the length of each second tooth shoe 270 in the circumferential direction of the plurality of second tooth shoes 270, and by setting the second radian to 7/3PI/Ns to 3×pi/Ns, where PI is PI and Ns is the number of slots of the stator core 100, so as to achieve that the second radian is within this range, the motor air gap field harmonic can be effectively reduced.

Specifically, the second arc is equal to 7/3PI/Ns.

Specifically, the second arc is equal to 3 XPI/Ns.

As shown in fig. 4 and 5, at least one core segment 200 includes a first core segment 210 and a second core segment 220. The second core segment 220 is axially arranged with the first core segment 210.

In this embodiment, as shown in fig. 6 and 7, at least one core segment 200 includes a first core segment 210 and a second core segment 220, that is, the stator core 100 is a segmented core, and the second core segment 220 is axially arranged with the first core segment 210, so that the first core segment 210 and the second core segment 220 form a nail core, and the stator core 100 is conveniently installed in a segmented manner.

As shown in fig. 1, the first tooth 260 of the first core segment 210 is axially opposite the second tooth 270 of the second core segment 220; the second tooth shoe 270 of the first core segment 210 is axially opposite the first tooth shoe 260 of the second core segment 220.

In this embodiment, the first tooth shoe 260 of the first core segment 210 is axially opposite the second tooth shoe 270 of the second core segment 220, and the second tooth shoe 270 of the first core segment 210 is axially opposite the first tooth shoe 260 of the second core segment 220, i.e., the first core segment 210 and the second core segment 220 are disposed opposite each other after installation, and because the first arc of the central angle occupied by the first tooth shoe 260 in one radial cross section of the stator core 100 is different from the second arc of the central angle occupied by the second tooth shoe 270 in the radial cross section, the notch of the first core segment 210 and the notch of the second core segment 220 are also not disposed opposite each other, i.e., the notch of the first core segment 210 and the notch of the second core segment 220 are staggered. After the coils of the stator winding are wound around the stator core 100, the windings are fixed, and the stability of the stator winding after installation is improved.

As shown in fig. 1 and 8, the first tooth shoe 260 of the first core segment 210 is axially opposite the first tooth shoe 260 of the second core segment 220; the second tooth shoe 270 of the first core segment 210 is axially opposite the second tooth shoe 270 of the second core segment 220.

In this embodiment, since the first tooth 260 of the first core segment 210 is axially opposite the first tooth 260 of the second core segment 220, the second tooth 270 of the first core segment 210 is axially opposite the second tooth 270 of the second core segment 220, i.e., the same tooth is oppositely disposed. That is, the same tooth shoes are oppositely arranged in the two core segments 200, so that the notch of the stator slot formed by the first tooth shoe 260 and the second tooth shoe 270 of the first core segment 210 is communicated with the notch of the stator slot formed by the first tooth shoe 260 and the second tooth shoe 270 of the second core segment 220 along the axial direction, and thus, when the stator winding is installed, the coil of the stator winding can be conveniently installed through the notch of the stator slot communicated along the axial direction, and the installation efficiency of the stator winding can be improved.

As shown in fig. 9 and 10, the stator core 100 further includes a third core segment 230, the third core segment 230 being axially disposed with the first core segment 210 between the first core segment 210 and the second core segment 220.

In this embodiment, the stator core 100 further includes a third core segment 230, where the third core segment 230 is disposed along the axial direction with the first core segment 210 and is located between the first core segment 210 and the second core segment 220, that is, in a manner that the third core segment 230 is disposed between the first core segment 210 and the second core segment 220, leakage flux can be effectively weakened, so that efficiency of the motor is improved.

Specifically, the third core segment 230 is made of a ferromagnetic material, so that the third core segment 230 made of the ferromagnetic material can effectively weaken magnetic leakage, thereby improving the efficiency of the motor.

Specifically, the third core segment 230 is made of a non-ferromagnetic material, so that the third core segment 230 made of a ferromagnetic material can effectively weaken magnetic leakage, thereby improving the efficiency of the motor.

As shown in fig. 10 and 11, the third core segment 230 includes a second yoke portion 232 and a plurality of second tooth portions 234. The plurality of second teeth 234 are connected to the second yoke 232 and are arranged along the circumferential direction of the second yoke 232.

In this embodiment, the third core segment 230 includes a second yoke 232 and a plurality of second teeth 234, and the plurality of second teeth 234 are connected to the second yoke 232 and arranged along the circumferential direction of the second yoke 232 to enable the installation of the plurality of second teeth 234, so that stator slots formed by the plurality of second teeth 234 can be communicated with stator slots in the first core segment 210 and stator slots in the second core segment 220, thereby facilitating the installation of the stator winding.

As shown in fig. 9 and 12, the thickness of the third core segment 230 in the axial direction is smaller than the thickness of the first core segment 210 in the axial direction.

In this embodiment, the thickness of the third core segment 230 in the axial direction is smaller than that of the first core segment 210, and since the third core segment 230 is provided to weaken magnetic leakage, if the thickness of the third core segment 230 is too large, the performance of the motor is affected, and thus by setting the thickness thereof to be smaller than that of the first core segment 210 in the axial direction, the effect of the third core segment 230 on the performance of the motor can be reduced, and the stability of the motor during operation is ensured.

As shown in fig. 13 and 14, at least one core segment 200 includes a plurality of core blocks 280, the plurality of core blocks 280 being arranged circumferentially.

In this embodiment, at least one segment 200 includes a plurality of core blocks 280, and the plurality of core blocks 280 are circumferentially arranged, i.e., the stator core 100 is formed by means of the plurality of core blocks 280. And, adopt the mode of a plurality of iron core pieces 280 when installing stator winding, can be earlier with stator winding's coil winding on iron core piece 280, install a plurality of iron core pieces 280 again after stator winding winds, and then make stator winding's installation more convenient, swift to can promote stator winding's installation effectiveness.

Specifically, each of the plurality of core blocks 280 is provided with a recess at one end in the circumferential direction and a protrusion at the other end, so that adjacent core blocks 280 can be mounted by means of a snap-fit connection, i.e., one end of one core block 280 having the recess is connected with one end of an adjacent core block 280 having the protrusion, thereby achieving the mounting of the stator core 100.

At least one core segment 200 includes a plurality of laminations arranged axially.

In this embodiment, at least one segment 200 includes a plurality of laminations, which are axially arranged, i.e., the stator core 100 in the present application is formed by stacking a plurality of laminations in a circumferential direction.

In one embodiment of the present invention, an electric motor is provided, which includes the stator core 100 in the above embodiment, and therefore, the electric motor has all the advantages of the stator core 100, which are not described herein.

Specifically, the motor is a single-phase asynchronous induction motor.

Specifically, as shown in fig. 4 and 15, the motor further includes a rotor core 300, and the rotor core 300 is mated with the stator core 100. The rotor core 300 has the rotor slot 400, and the notch of the rotor slot 400 is set up to be inclined with respect to the axis of the motor from the first side to the second side of the rotor core 300 in the axial direction, and the first distance between the notch of the rotor slot 400 located on the first side of the rotor core 300 and the notch of the rotor slot 400 located on the second side of the rotor core 300 in the circumferential direction is L1, so that the fundamental wave of the air-gap magnetic field can be kept substantially unchanged while the harmonic wave of the air-gap magnetic field of the motor is reduced. Thereby suppressing the output torque of the motor from dropping due to the harmonics.

Specifically, as shown in fig. 4, the motor core includes a stator core 100 and a rotor core 300, the stator core 100 is formed by stacking N lamination blocks, where N is equal to or greater than 2, in this embodiment, as shown in fig. 5, N is equal to 2, that is, the stator core 100 is composed of a first core segment 210 and a second core segment 220, as shown in fig. 6 and 7, each core segment 200 is composed of two kinds of core blocks 280, as shown in fig. 13 and 14, each core block 280 is formed by stacking the same lamination blocks, and the lamination/lamination blocks of the first core segment 210 are provided with a first yoke 240, a first tooth body, and a first tooth shoe 260; the lamination/lamination block of the second core segment 220 is provided with a first yoke 240, a first tooth, and a second tooth shoe 270. The first tooth shoe 260 and the second tooth shoe 270 are connected to the tooth body, the first yoke 240 is connected to the first tooth body, and the first radian of the central angle occupied by the first tooth shoe 260 in one radial section of the stator core 100 is θ ₁ The second shoe 270 occupies a first arc of a central angle θ in a radial cross section of the stator core 100 ₂ ，θ ₁ And theta ₂ Different.

Specifically, as shown in fig. 12, the motor core includes a stator core 100 and a rotor core 300, the stator core 100 being formed by stacking N lamination blocks, where N is equal to or greater3, in this embodiment, N is equal to 3, that is, the stator core 100 is formed by a first core segment 210, a second core segment 220, and a third core segment 230, as shown in fig. 6 and 7, each core segment 200 in the first core segment 210 and the second core segment 220 is formed by two core blocks 280, each core block 280 is formed by stacking the same lamination, and a first yoke 240, a first tooth body, and a first tooth shoe 260 are disposed on the lamination/lamination block of the first core segment 210; the lamination/lamination block of the second core segment 220 is provided with a first yoke 240, a first tooth, and a second tooth shoe 270. The first tooth shoe 260 and the second tooth shoe 270 are connected to the tooth body, the first yoke 240 is connected to the first tooth body, and the first radian of the central angle occupied by the first tooth shoe 260 in one radial section of the stator core 100 is θ ₁ The second shoe 270 occupies a first arc of a central angle θ in a radial cross section of the stator core 100 ₂ ，θ ₁ And theta ₂ Different. As shown in fig. 10, the third core segment 230 is axially disposed with the first core segment 210 between the first core segment 210 and the second core segment 220, and the third core segment 230 is composed of one core segment 200.

Specifically, in the related art, the concentrated winding single-phase induction motor has rich air gap field harmonic waves, and the asynchronous parasitic torque of the motor is very remarkable, so that the low-speed torque characteristic of the motor is obviously inferior to that of the distributed winding single-phase induction motor, and the starting and low-speed running of the motor are not facilitated. This problem is usually solved by a distributed winding scheme, but compared to a concentrated winding scheme, the distributed winding scheme usually results in problems of long end part, high material consumption and complex manufacturing, and in this embodiment, the first tooth shoes 260 and the second tooth shoes 270 adjacent in the axial direction in the first punching segments and the second punching segments are offset in the circumferential direction, and the notches of the inclined stator slots are matched with the notches of the inclined rotor slots 400, so that the fundamental wave of the air-gap magnetic field of the motor can be kept substantially unchanged while the harmonic wave of the air-gap magnetic field of the motor is reduced. So that the output torque of the motor can be suppressed from being reduced by the harmonics.

In the related art, that is, in the conventional scheme, an inclined notch is formed in the rotor core, and the inclined notch is not formed in the stator core. The reference solution is that no inclined notch is formed in the stator core and the rotor core, that is, the reference solution, the conventional solution and the solution between the motor rotation speed and the output torque of the present application are shown in fig. 16, and compared with the other two solutions, the present application sets the first tooth shoe 260 and the second tooth shoe 270 alternately arranged in the circumferential direction, and the solutions that the central angles corresponding to the first tooth shoe 260 and the second tooth shoe 270 are different, and the output torque that can be avoided by the present application is reduced under the same rotation speed.

As shown in fig. 17, there are shown a reference scheme, a conventional scheme, and a scheme between the motor rotation speed and the motor efficiency of the present application, compared to the other two schemes, the present application can avoid efficiency degradation in the present application by providing the first tooth shoe 260 and the second tooth shoe 270 alternately arranged in the circumferential direction, and the schemes that the central angles corresponding to the first tooth shoe 260 and the second tooth shoe 270 are different, at the same rotation speed.

In one embodiment of the present invention, an electrical apparatus is provided, which includes the stator core 100 or the motor in the above embodiment, and therefore, the electrical apparatus has all the advantages of the stator core 100 and the motor, which are not described herein.

In one embodiment of the present invention, a vehicle is provided, which includes the stator core 100 or the motor in the above embodiment, and therefore, the vehicle has all the advantages of the stator core 100 and the motor, which are not described herein.

In the claims, specification and drawings of the present invention, the term "plurality" means two or more, unless explicitly defined otherwise, the orientation or positional relationship indicated by the terms "upper", "lower", etc. are based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present invention and making the description process easier, and not for the purpose of indicating or implying that the device or element in question must have the particular orientation described, be constructed and operated in the particular orientation, and therefore such description should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly, and may be, for example, a fixed connection between a plurality of objects, a removable connection between a plurality of objects, or an integral connection; the objects may be directly connected to each other or indirectly connected to each other through an intermediate medium. The specific meaning of the terms in the present invention can be understood in detail from the above data by those of ordinary skill in the art.

In the claims, specification, and drawings of the present invention, the descriptions of terms "one embodiment," "some embodiments," "particular embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In the claims, specification and drawings of the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A stator core comprising at least one core segment, said at least one core segment comprising:

a first yoke;

a plurality of first teeth connected to the first yoke and arranged in a circumferential direction of the first yoke;

a plurality of first tooth shoes connected with the plurality of first tooth parts respectively;

a plurality of second tooth shoes, the plurality of second tooth shoes and the plurality of first tooth shoes being alternately arranged in the circumferential direction, respectively connected with the plurality of first tooth portions;

wherein, the first radian of the central angle occupied by the first tooth shoe on one radial section of the stator core is different from the second radian of the central angle occupied by the second tooth shoe on the radial section.

2. The stator core of claim 1, wherein the first arc is less than the second arc.

3. The stator core according to claim 1, wherein the first radian is equal to or greater than PI/Ns and equal to or less than 5/3 x PI/Ns;

PI is PI, and NS is the number of slots of the stator core.

4. The stator core according to claim 1, wherein the second radian is 7/3PI/Ns or more and 3 x PI/Ns or less;

PI is PI, and NS is the number of slots of the stator core.

5. The stator core of claim 1, wherein the at least one core segment comprises:

a first core segment;

and the second iron core section is axially arranged with the first iron core section.

6. The stator core of claim 5, wherein a first tooth shoe of the first core segment is axially opposite a second tooth shoe of the second core segment;

the second tooth shoe of the first core segment is axially opposite the first tooth shoe of the second core segment.

7. The stator core of claim 5, wherein the first tooth shoe of the first core segment is axially opposite the first tooth shoe of the second core segment;

the second tooth shoe of the first core segment is axially opposite the second tooth shoe of the second core segment.

8. The stator core as claimed in claim 5 further comprising:

and the third iron core segment is axially arranged with the first iron core segment and is positioned between the first iron core segment and the second iron core segment.

9. The stator core of claim 8, wherein the third core segment comprises:

a second yoke;

and a plurality of second teeth connected to the second yoke and arranged in a circumferential direction of the second yoke.

10. The stator core of claim 9, wherein the thickness of the third core segment in the axial direction is less than the thickness of the first core segment in the axial direction.

11. The stator core according to any one of claims 1 to 10, wherein the at least one core segment comprises:

a plurality of core blocks arranged in a circumferential direction.

12. The stator core according to any one of claims 1 to 10, wherein the at least one core segment comprises:

a plurality of punches arranged in an axial direction.

13. An electric machine comprising a stator core as claimed in any one of claims 1 to 12.

14. An electrical appliance comprising a stator core as claimed in any one of claims 1 to 12, or an electrical machine as claimed in claim 13.

15. A vehicle comprising the stator core according to any one of claims 1 to 12, or the motor according to claim 13.