Stator, motor, compressor, and vehicle

Abstract

The present application provides a stator, a motor, a compressor, and a vehicle. The stator comprises: a stator core, the stator core comprising a stator yoke and a plurality of stator teeth, every two adjacent stator teeth and the stator yoke defining stator slots, and the stator core having a first end and a second end in the axial direction; a first insulating frame provided at the first end; a second insulating frame provided at the second end, either of the first insulating frame and the second insulating frame comprising a plurality of insulating teeth, each stator tooth being connected to one insulating tooth, each insulating tooth of at least one of the first insulating frame and the second insulating frame being provided with an extension portion, and the extension portion being located at a slot opening of the corresponding stator slot; and slot insulating paper provided in the stator slots, wherein the slot insulating paper abuts against the extension portions, and the extension portions at least can hold the slot insulating paper in place in the radial direction of the stator core. In the circumferential direction of the stator core, the gap value of the extension portions of every two adjacent insulating teeth is marked as d01, and the width of the slot openings of the stator slots is marked as T, wherein d01<T.

Description

Stators, motors, compressors and vehicles

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on June 30, 2023, with application number "202310791417.3" and invention name "Stator, Motor, Compressor and Vehicle", the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of motors, and in particular to a stator, a motor, a compressor and a vehicle. Background Art

[0003] In the related art, a permanent magnet synchronous motor includes a stator core and slot insulation paper. The stator core is provided with stator slots, and the slot insulation paper is provided in the stator slots. In order to avoid undesirable problems such as bulges in the slot insulation paper, the slot width of the stator slot in the circumferential direction of the stator core is relatively small. In this way, the leakage flux is relatively large, resulting in a small output torque of the motor and poor performance of the motor. Technical Solutions

[0004] This application aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] To this end, a first aspect of the present application proposes a stator.

[0006] A second aspect of the present application provides an electric motor.

[0007] A third aspect of the present application provides a compressor.

[0008] A fourth aspect of the present application provides a vehicle.

[0009] In view of this, the first aspect of the present application proposes a stator, comprising: a stator core, the stator core comprising a stator yoke and a plurality of stator teeth, each stator tooth being connected to the inner circumferential wall of the stator yoke, the plurality of stator teeth being arranged at intervals around the axis of the stator core, two adjacent stator teeth and the stator yoke enclosing a stator slot, the stator core having a first axial end and a second axial end; a first insulating frame, arranged at the first end; a second insulating frame, arranged at the second end, either the first insulating frame or the second insulating frame comprising a plurality of insulating teeth, each stator tooth being connected to one insulating tooth, the insulating teeth of at least one of the first insulating frame and the second insulating frame being provided with an extension, the extension being located at the slot opening of the stator slot; slot insulating paper, arranged in the stator slot, and the slot insulating paper abutting against the extension, the extension being capable of at least limiting the slot insulating paper in the radial direction of the stator core; wherein, along the circumferential direction of the stator core, the gap value between the extensions of two adjacent insulating teeth is denoted as d01, and the slot opening width of the stator slot is denoted as T, wherein d01<T.

[0010] The stator described above in this application may also have the following additional technical features:

[0011] In some embodiments, illustratively, the extension portion is connected to a slot wall of the stator slot.

[0012] In some embodiments, exemplarily, the insulating tooth provided with an extension portion includes a tooth body, the tooth body is provided with a slot, and the end of the stator tooth is inserted into the slot; the extension portion is connected to the end face of the tooth body facing the axis of the stator core, and the extension portion includes two extension sections, and the two extension sections are arranged at intervals in the circumferential direction of the stator core, each extension section extends into the slot opening of a stator slot, and each extension section abuts against the slot insulation paper.

[0013] In some embodiments, exemplarily, when the insulating teeth of either the first insulating frame or the second insulating frame are provided with extensions, along the circumference of the stator core, the gap value of the extensions of two adjacent insulating teeth of the first insulating frame is equal to the gap value of the extensions of two adjacent insulating teeth of the second insulating frame.

[0014] In some embodiments, exemplarily, the stator core includes: a first punching sheet group; a second punching sheet group, wherein the second punching sheet group is stacked on one side of the first punching sheet group along the axial direction of the stator core, and the second punching sheet group is closer to the end of the stator core than the first punching sheet group, and either the first punching sheet group and the second punching sheet group includes: an annular yoke, the stator yoke includes an annular yoke; a plurality of teeth, the tooth portions are connected to the inner circumferential wall of the annular yoke, each stator tooth includes a tooth portion, and the end face of the tooth portion facing the axis of the stator core is a tooth face; along the circumferential direction of the stator core, the gap value between two adjacent tooth faces of the first punching sheet group is different from the gap value between two adjacent tooth faces of the second punching sheet group.

[0015] In some embodiments, exemplarily, along the circumference of the stator core, the gap value between two adjacent tooth surfaces of the first punching sheet group is recorded as d1, and the gap value between two adjacent tooth surfaces of the second punching sheet group is recorded as d2, wherein d2>d1≥d01.

[0016] In some embodiments, d1 and d2 satisfy, illustratively, 1.5<d2 / d1<3.

[0017] In some embodiments, exemplarily, the stator core further includes: a third punching sheet group, the second punching sheet group is located between the first punching sheet group and the third punching sheet group; the third punching sheet group includes an annular yoke and a plurality of tooth portions, and along the circumference of the stator core, the gap value between two adjacent tooth surfaces of the third punching sheet group is recorded as d3, where d3>d2.

[0018] In some embodiments, illustratively, the number of first punching sheet groups is denoted as m, the number of second punching sheet groups is denoted as n, a first punching sheet group is provided between any two adjacent second punching sheet groups, m≥1, n≥2; the axial height of the first punching sheet group is denoted as h1, the axial height of the second punching sheet group is denoted as h2, wherein 0.05<(m×h1) / (n×h2)<0.2.

[0019] In some embodiments, illustratively, the distance from the stator teeth to the axis of the stator core is recorded as D1, and the distance from the outer peripheral wall of the stator yoke to the axis of the stator core is recorded as D2, wherein 0.6≤D1 / D2≤0.7.

[0020] A second aspect of the present application provides a motor, comprising: a stator as in the first aspect, wherein a plurality of stator teeth enclose an assembly cavity; and a rotor rotatably disposed in the assembly cavity.

[0021] In the above technical solution, further, the rotor includes: an iron core body; an axial hole, provided in the iron core body; a plurality of magnet slot groups, provided in the iron core body, and the plurality of magnet slot groups are arranged at intervals around the axial hole; a plurality of slit groups, provided in the iron core body, a slit group is arranged between each magnet slot group and the outer peripheral wall of the iron core body, and the slit group includes an odd number of slits.

[0022] In some embodiments, illustratively, the rotor further includes a plurality of permanent magnets, each magnet slot group is provided with a permanent magnet, and the permanent magnets contain X% by mass of cerium; the stator further includes a winding, and the winding is wound on a plurality of stator teeth; the weight of the plurality of permanent magnets is denoted as Mp, the weight of the winding is denoted as Mc, the back electromotive force value of the motor at a speed of 1000 rpm is denoted as Ke, and the maximum allowable operating voltage of the power device of the motor controller is denoted as Ub, wherein (Mp / Mc)×Ub×X%≤Ke.

[0023] The third aspect of the present application proposes a compressor, comprising: a motor as in any technical solution in the second aspect.

[0024] The compressor provided in the present application includes a motor as in any technical solution in the second aspect, and therefore has all the beneficial effects of the above-mentioned motors, which will not be described one by one here.

[0025] A fourth aspect of the present application provides a vehicle, comprising: a compressor as in the third aspect.

[0026] Since the vehicle provided in the present application includes the compressor as in the third aspect, it has all the beneficial effects of the above-mentioned compressor, which will not be listed one by one here.

[0027] It is worth noting that the vehicle can be a new energy vehicle, which includes pure electric vehicles, extended-range electric vehicles, hybrid electric vehicles, fuel cell electric vehicles, hydrogen engine vehicles, etc.

[0028] Additional aspects and advantages of the present application will become apparent in the following description or may be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0030] FIG1 shows a schematic structural diagram of a first portion of a stator according to an embodiment of the present application;

[0031] FIG2 shows a schematic structural diagram of a second portion of a stator according to an embodiment of the present application;

[0032] FIG3 shows a schematic structural diagram of the third part of the stator according to an embodiment of the present application;

[0033] FIG4 is a schematic diagram showing a partial structure of a stator core and a first insulating frame according to an embodiment of the present application;

[0034] FIG5 is a schematic diagram showing a partial structure of a first insulating frame from a first perspective according to an embodiment of the present application;

[0035] FIG6 is a schematic diagram showing a partial structure of a first insulating frame from a second perspective according to an embodiment of the present application;

[0036] FIG7 shows a partial structural diagram of a second insulating frame according to an embodiment of the present application;

[0037] FIG8 is a schematic structural diagram of a stator core from a first perspective according to an embodiment of the present application;

[0038] FIG9 shows a schematic structural diagram of a stator core from a second perspective according to an embodiment of the present application;

[0039] FIG10 is a schematic diagram showing a partial structure of a motor according to an embodiment of the present application;

[0040] FIG11 shows a schematic structural diagram of a compressor according to an embodiment of the present application;

[0041] FIG12 is a schematic diagram showing a change trend of the armature reaction voltage and output torque of the motor of the first embodiment of the present application;

[0042] FIG13 is a schematic diagram showing a change trend of the armature reaction voltage and output torque of the motor according to the second embodiment of the present application;

[0043] FIG14 shows a maximum torque variation curve of a motor according to an embodiment of the present application;

[0044] FIG15 is a schematic diagram showing the changing trends of the output torque and the 2-fold frequency radial force density of a motor according to an embodiment of the present application.

[0045] The corresponding relationship between the reference numerals and component names in Figures 1 to 11 is as follows:

[0046] 1 Motor, 10 Stator, 100 Stator core, 110 Stator yoke, 120 Stator teeth, 130 Stator slots, 140 First end, 150 Second end, 160 First punching sheet group, 170 Second punching sheet group, 180 Annular yoke, 190 Tooth portion, 192 Tooth surface, 200 Third punching sheet group, 210 Assembly cavity, 300 First insulation frame, 400 Second insulation frame, 500 Insulating teeth, 510 Tooth body, 520 Slot, 600 Extension, 610 Extension section, 700 Slot insulation paper, 710 Phase insulation, 800 Winding, 90 Rotor, 910 Core body, 920 Shaft hole, 930 Magnet slot group, 940 Slit group, 942 Slit, 950 Permanent magnet, 4 Compressor, 41 Cover plate, 42 Inverter, 43 Drive shaft, 44 Inlet, 45 Housing, 46 Compression section, 47 Discharge port. Modes for Carrying Out the Invention

[0047] In order to more clearly understand the above-mentioned objects, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other in the absence of conflict.

[0048] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0049] 1 to 15 , a stator 10 , a motor 1 , a compressor 4 , and a vehicle according to some embodiments of the present application are described below.

[0050] As shown in Figures 1, 2, 3, 4, 5, 6 and 7, according to some embodiments of the present application, a stator 10 includes a stator core 100, a first insulating frame 300, a second insulating frame 400 and slot insulation paper 700.

[0051] The stator core 100 includes a stator yoke 110 and a plurality of stator teeth 120 , each of which is connected to an inner peripheral wall of the stator yoke 110 .

[0052] A plurality of stator teeth 120 are arranged at intervals around the axis of the stator core 100 , and two adjacent stator teeth 120 and the stator yoke 110 enclose a stator slot 130 .

[0053] The stator core 100 has a first end 140 and a second end 150 in an axial direction.

[0054] The first insulation frame 300 is disposed at the first end 140 .

[0055] The second insulation frame 400 is disposed at the second end 150 .

[0056] Either the first insulation frame 300 or the second insulation frame 400 includes a plurality of insulation teeth 500 .

[0057] Each stator tooth 120 is connected to an insulating tooth 500 .

[0058] The insulating teeth 500 of at least one of the first insulating frame 300 and the second insulating frame 400 are provided with extension portions 600 , and the extension portions 600 are located at slot openings of the stator slots 130 .

[0059] The slot insulation paper 700 is disposed in the stator slot 130 , and the slot insulation paper 700 abuts against the extension portion 600 . The extension portion 600 can at least limit the slot insulation paper 700 in the radial direction of the stator core 100 .

[0060] In the circumferential direction of the stator core 100 , the gap between the extension portions 600 of two adjacent insulating teeth 500 is denoted as d01 , and the slot width of the stator slot 130 is denoted as T, wherein d01<T.

[0061] In this embodiment, the stator 10 includes a stator core 100 , a first insulation frame 300 , a second insulation frame 400 , and slot insulation paper 700 .

[0062] The stator core 100 includes a stator yoke 110 and stator teeth 120. There are multiple stator teeth 120, each of which is connected to the inner circumferential wall of the stator yoke 110. The multiple stator teeth 120 are spaced apart around the axis of the stator core 100, and two adjacent stator teeth 120 and the stator yoke 110 enclose a stator slot 130. The stator core 100 has a first end 140 and a second end 150. The first end 140 and the second end 150 of the stator core 100 are spaced apart and opposite each other along the axial direction of the stator core 100.

[0063] The first insulating frame 300 is disposed at the first end 140 of the stator core 100, and the second insulating frame 400 is disposed at the second end 150 of the stator core 100. Either the first insulating frame 300 or the second insulating frame 400 includes a plurality of insulating teeth 500. Specifically, the first insulating frame 300 includes a plurality of insulating teeth 500, and the second insulating frame 400 includes a plurality of insulating teeth 500. Each stator tooth 120 is connected to an insulating tooth 500 of the first insulating frame 300 and an insulating tooth 500 of the second insulating frame 400.

[0064] The insulating teeth 500 of the first insulating frame 300 are provided with extension parts 600 , or the insulating teeth 500 of the second insulating frame 400 are provided with extension parts 600 , or both the insulating teeth 500 of the first insulating frame 300 and the insulating teeth 500 of the second insulating frame 400 are provided with extension parts 600 .

[0065] After the first insulating frame 300, the second insulating frame 400, the slot insulating paper 700, and the stator core 100 are assembled, the slot insulating paper 700 is disposed in the stator slot 130, the extension 600 extends into the notch of the stator slot 130, and the slot insulating paper 700 abuts against the extension 600. The extension 600 can at least limit the slot insulating paper 700 in the radial direction of the stator core 100 to ensure the matching size of the slot insulating paper 700 and the stator slot 130.

[0066] The first insulating frame 300, the second insulating frame 400, and the stator core 100 are properly configured to coordinate with each other, so that the gap between the extensions 600 of two adjacent insulating teeth 500 in the circumferential direction of the stator core 100 is denoted as d01, and the slot width of the stator slot 130 in the circumferential direction of the stator core 100 is denoted as T. The relationship between d01 and T is defined so that d01 < T. In other words, the extensions 600 located at the slot openings of the stator slots 130 and the slot walls of the stator slots 130 cooperate to jointly limit the slot insulation paper 700. Because the gap between the extensions 600 of two adjacent insulating teeth 500 in the circumferential direction of the stator core 100 is relatively small, the extensions 600 located at the slot openings of the stator slots 130 can effectively block the slot insulation paper 700, preventing the slot insulation paper 700 from protruding beyond the inner diameter of the stator core 100, thereby preventing problems such as inward bulging of the slot insulation paper 700. Furthermore, due to the presence of the extension 600, the slot width of the stator slot 130 in the circumferential direction of the stator core 100 can be appropriately increased. This configuration can reduce magnetic flux leakage, increase the output torque of the motor 1, and improve the high-frequency overload capacity of the motor 1, thereby improving the performance and reliability of the motor 1. In other words, the slot wall of the stator slot 130 and the extension 600 cooperate to take into account the magnetic flux leakage of the motor 1 and prevent the inward bulge of the slot insulation paper 700, thereby improving the power density of the motor 1 while ensuring the safety and reliability of the motor 1.

[0067] It is understandable that at least one of the first insulating frame 300 and the second insulating frame 400 is provided with an extension 600, that is, at least one of the first insulating frame 300 and the second insulating frame 400 serves as a mounting carrier for the extension 600, has the function of mounting and fixing the extension 600, and can ensure the matching dimensions of the extension 600, the notch of the stator slot 130, and the slot insulating paper 700. In other words, the existing structure of the first insulating frame 300 and the second insulating frame 400 is rationally utilized, enriching the function of the insulating frame provided with the extension 600, so that the insulating frame provided with the extension 600 has both an insulating function and a function of preventing the slot insulating paper 700 from bulging inward. Moreover, this arrangement also provides structural support for increasing the notch of the stator slot 130, and while ensuring the matching dimensions of the slot insulating paper 700 and the stator core 100, it can reduce leakage flux and improve the high-frequency overload capacity of the motor 1.

[0068] In some embodiments, as shown in FIG. 4 , the extension portion 600 is connected to the slot wall of the stator slot 130 .

[0069] In this embodiment, the mating structure of the extension portion 600 and the stator slot 130 is further defined, so that the extension portion 600 is connected to the slot wall of the stator slot 130. That is, the extension portion 600 is located at the notch of the stator slot 130, and the extension portion 600 and the slot wall of the stator slot 130 are interconnected. This arrangement allows the extension portion 600 and the slot wall of the stator slot 130 to be connected as a whole. In this way, the slot insulation paper 700 can be effectively prevented from protruding from the gap between the slot wall of the stator slot 130 and the extension portion 600, providing effective and reliable structural support to ensure the safety and reliability of the motor 1.

[0070] In some embodiments, as shown in FIG. 2 , FIG. 3 , FIG. 4 , FIG. 5 , FIG. 6 , and FIG. 7 , the insulating tooth 500 provided with the extension portion 600 includes a tooth body 510 .

[0071] The tooth body 510 defines a slot 520 , and the end of the stator tooth 120 is inserted into the slot 520 .

[0072] The extension portion 600 is connected to the end surface of the tooth body 510 facing the axis of the stator core 100 .

[0073] The extension portion 600 includes two extension segments 610 , which are spaced apart in the circumferential direction of the stator core 100 .

[0074] Each extension section 610 extends into the slot opening of a stator slot 130 , and each extension section 610 abuts against the slot insulation paper 700 .

[0075] In this embodiment, the structures of the first insulating frame 300 and the second insulating frame 400 are further defined, so that the insulating tooth 500 provided with the extension portion 600 includes a tooth body 510, and the tooth body 510 is provided with a slot 520, and the end of the stator tooth 120 is inserted into the slot 520. This arrangement is conducive to increasing the matching area of ​​the first insulating frame 300, the second insulating frame 400 and the stator core 100, and can ensure the stability and reliability of the assembly of the first insulating frame 300, the second insulating frame 400 and the stator core 100.

[0076] The extension portion 600 includes two extension sections 610, which are spaced apart along the circumference of the stator core 100. One of the two extension sections 610 is connected to the end surface of the tooth body 510 that faces the axis of the stator core 100. Each extension section 610 extends into the opening of a stator slot 130. In other words, the two extension sections 610 of the extension portion 600 extend into the openings of two stator slots 130, respectively. In other words, two extension sections 610 are provided at the opening of one stator slot 130, or four extension sections 610 are provided at the opening of one stator slot 130. This arrangement can increase the contact area between the extension portion 600 and the slot insulating paper 700 and ensure the balance and consistency of the contact between the extension portion 600 and the slot insulating paper 700, thereby avoiding the situation where one circumferential side of the slot insulating paper 700 contacts the extension portion 600 while the other circumferential side of the slot insulating paper 700 separates from the extension portion 600, which may easily lead to the slot insulating paper 700 bulging inward.

[0077] In addition, the extension portion 600 is connected to the end face of the tooth body 510 facing the axis of the stator core 100. This arrangement can not only meet the use requirement of the extension portion 600 at the slot opening of the stator slot 130, but also reduce the occupancy rate of the extension portion 600 on the internal space of the stator slot 130.

[0078] In some embodiments, when the insulating teeth 500 of either the first insulating frame 300 or the second insulating frame 400 are provided with an extension 600, along the circumference of the stator core 100, the gap value between the extension portions 600 of two adjacent insulating teeth 500 of the first insulating frame 300 is equal to the gap value between the extension portions 600 of two adjacent insulating teeth 500 of the second insulating frame 400.

[0079] In this embodiment, the structures of the first insulating frame 300 and the second insulating frame 400 are further defined. When the insulating teeth 500 of the first insulating frame 300 are provided with extensions 600, and the insulating teeth 500 of the second insulating frame 400 are provided with extensions 600, the gap between the extensions 600 of two adjacent insulating teeth 500 of the first insulating frame 300 and the gap between the extensions 600 of two adjacent insulating teeth 500 of the second insulating frame 400 along the circumference of the stator core 100 are equal. This reduces the difficulty in manufacturing the first insulating frame 300 and the second insulating frame 400, facilitating production, improving processing efficiency, and reducing product production costs.

[0080] In addition, this structural setting can ensure the balance and consistency of the contact area between the extension portion 600 of the first insulating frame 300 and the extension portion 600 of the second insulating frame 400 and the slot insulating paper 700, which is conducive to improving the effectiveness and feasibility of preventing the slot insulating paper 700 from bulging inward.

[0081] In some embodiments, as shown in FIG. 8 , the stator core 100 includes a first punching sheet group 160 and a second punching sheet group 170 .

[0082] Along the axial direction of the stator core 100 , the second punching sheet group 170 is stacked on one side of the first punching sheet group 160 .

[0083] Furthermore, the second punching sheet group 170 is closer to the end of the stator core 100 than the first punching sheet group 160 .

[0084] Either the first punching plate group 160 or the second punching plate group 170 includes an annular yoke portion 180 and a plurality of teeth portions 190 .

[0085] The stator yoke 110 includes an annular yoke portion 180 .

[0086] The tooth portion 190 is connected to the inner peripheral wall of the annular yoke portion 180 , and each stator tooth 120 includes one tooth portion 190 .

[0087] An end surface of the tooth portion 190 facing the axis of the stator core 100 is a tooth surface 192 .

[0088] Along the circumferential direction of the stator core 100 , a gap value between two adjacent tooth surfaces 192 of the first punching sheet group 160 is different from a gap value between two adjacent tooth surfaces 192 of the second punching sheet group 170 .

[0089] In this embodiment, the stator core 100 includes a first punching sheet group 160 and a second punching sheet group 170 .

[0090] The first punching sheet group 160 and the second punching sheet group 170 are arranged along the axial direction of the stator core 100 .

[0091] In some embodiments, along the axial direction of the stator core 100 , the second punching sheet group 170 is stacked on one side of the first punching sheet group 160 .

[0092] The first punching sheet group 160 includes an annular yoke 180 and a plurality of tooth portions 190 , any one of the plurality of tooth portions 190 is connected to the inner circumferential wall of the annular yoke 180 , and the plurality of tooth portions 190 are arranged at intervals around the axis of the stator core 100 , the stator yoke 110 includes the annular yoke 180 , and each stator tooth 120 includes a tooth portion 190 .

[0093] The second punching sheet group 170 includes an annular yoke 180 and a plurality of tooth portions 190 , any one of the plurality of tooth portions 190 is connected to the inner circumferential wall of the annular yoke 180 , and the plurality of tooth portions 190 are arranged at intervals around the axis of the stator core 100 , the stator yoke 110 includes the annular yoke 180 , and each stator tooth 120 includes a tooth portion 190 .

[0094] The structures of the first punching sheet group 160 and the second punching sheet group 170 are defined so that along the circumferential direction of the stator core 100 , the gap value between two adjacent tooth surfaces 192 of the first punching sheet group 160 is different from the gap value between two adjacent tooth surfaces 192 of the second punching sheet group 170 .

[0095] It is understandable that under symmetrical load, the effect of the armature magnetomotive force on the fundamental wave of the main pole magnetic field is the armature reaction. The armature reaction will affect the performance of the motor 1. The present application reasonably arranges the structure of the stator 10 so that the first punching group 160 and the second punching group 170 are provided with different slot widths in the circumferential direction of the stator core 100. In this way, the armature reaction of the motor 1 can be improved, the voltage of the armature reaction of the motor 1 can be reduced, and the torque output of the motor 1 under high-speed conditions can be improved.

[0096] It is understood that, along the circumference of the stator core 100, the punching sheet group with a smaller gap value between two adjacent tooth surfaces 192 has the function of blocking the winding 800 and slot insulation paper 700 of the stator 10, while the punching sheet group with a larger gap value between two adjacent tooth surfaces 192 has the function of reducing magnetic leakage and increasing the output torque of the motor 1. In other words, this arrangement takes into account both the magnetic leakage of the motor 1 and the blocking of the winding 800 and slot insulation paper 700 of the stator 10 from protruding from the inner diameter of the stator core 100, which is conducive to improving the safety and reliability of the use of the motor 1.

[0097] In some embodiments, as shown in FIG. 3 and FIG. 9 , along the circumferential direction of the stator core 100 , the gap between two adjacent tooth surfaces 192 of the first punching sheet group 160 is denoted as d1 .

[0098] The gap between two adjacent tooth surfaces 192 of the second punching plate group 170 is recorded as d2.

[0099] Among them, d2>d1≥d01.

[0100] In this embodiment, the structure of the stator core 100 is further defined such that the gap between two adjacent tooth surfaces 192 of the first punching group 160 in the circumferential direction of the stator core 100 is denoted as d1, and the gap between two adjacent tooth surfaces 192 of the second punching group 170 in the circumferential direction of the stator core 100 is denoted as d2. The relationship between d1, d2, and d01 is defined such that d2>d1≥d01. That is, the stator core 100 includes punching groups having stator slots 130 with different slot widths, and the gap value d1 of the slot width is greater than or equal to the gap value d01 between the extension portions 600 of two adjacent insulating teeth 500. The first punching sheet group 160 and the extension part 600 can cooperate to effectively block the slot insulation paper 700, preventing the slot insulation paper 700 from protruding from the inner diameter of the stator core 100. The second punching sheet group 170 and the first punching sheet group 160 can cooperate to reduce leakage magnetic field, increase the output torque of the motor 1, and improve the high-frequency overload capacity of the motor 1, which is beneficial to improving the performance of the motor 1 and the reliability of the motor 1.

[0101] It is understandable that the second punching sheet group 170 is closer to the end of the stator core 100 than the first punching sheet group 160, that is, the distance from the second punching sheet group 170 to the end of the stator core 100 is smaller than the distance from the first punching sheet group 160 to the end of the stator core 100. In other words, along the circumference of the stator core 100, the punching sheet group with a smaller slot width is closer to the middle of the stator core 100. In this way, the slot insulation paper 700 of the stator 10 can be effectively blocked, preventing the slot insulation paper 700 from protruding from the inner diameter of the stator core 100, and improving the reliability of the motor 1.

[0102] In some embodiments, d1 and d2 satisfy: 1.5<d2 / d1<3.

[0103] In this embodiment, the matching structure of the first punching sheet group 160 and the second punching sheet group 170 is further defined so that the width d1 of the stator slot 130 of the first punching sheet group 160 in the circumferential direction of the stator core 100 and the width d2 of the stator slot 130 of the second punching sheet group 170 in the circumferential direction of the stator core 100 satisfy the following: 1.5<d2 / d1<3. The slot width d1=2.0mm of the stator slot 130 of the first punching sheet group 160 can effectively prevent the slot insulation from bulging inward. However, a smaller slot width will increase leakage flux, resulting in a decrease in the output torque of the motor 1 and an increase in the armature reaction voltage of the motor 1. If the slot width of the motor 1 is too large, the effective stator-rotor gap of the motor 1 will increase, resulting in a decrease in the output torque of the motor 1 and an increase in the armature reaction voltage of the motor 1. As shown in FIG13 , the present application can improve the armature reaction of the motor 1 , reduce the voltage of the armature reaction of the motor 1 , and improve the torque output of the motor 1 under high-speed conditions by reasonably setting the structure of the stator 10 .

[0104] If d2 / d1 is less than or equal to 1.5, the difference between the slot width of the first punching sheet group 160 in the circumferential direction of the stator core 100 and the slot width of the second punching sheet group 170 in the circumferential direction of the stator core 100 is small, that is, the slot width of the first punching sheet group 160 in the circumferential direction of the stator core 100 is closer to the slot width of the second punching sheet group 170 in the circumferential direction of the stator core 100. In this way, the effect of alleviating the armature reaction is poor, and the effect of improving the torque output of the motor 1 under high-speed conditions is poor.

[0105] If d2 / d1 is greater than or equal to 3, the width of the stator slots 130 of the second punching sheet group 170 in the circumferential direction of the stator core 100 is too large. This makes it impossible to effectively block the winding 800 wound around the teeth 190 of the first punching sheet group 160 and the second punching sheet group 170. The winding 800 is likely to be separated from the teeth 190, and the stability and reliability of the electron movement cannot be guaranteed. This setting also increases the gap between the stator and rotor 90 of the motor 1, which affects the power density of the motor 1 and the torque output of the motor 1.

[0106] Illustratively, d2 / d1=1.7, d2 / d1=1.9, d2 / d1=2, d2 / d1=2.2, d2 / d1=2.4, d2 / d1=2.6 and d2 / d1=2.8, etc., which are not listed here one by one.

[0107] In some embodiments, as shown in FIG. 8 and FIG. 9 , the stator core 100 further includes a third punching sheet group 200 .

[0108] The second punching sheet group 170 is located between the first punching sheet group 160 and the third punching sheet group 200 .

[0109] The third punching plate group 200 includes an annular yoke 180 and a plurality of teeth 190 .

[0110] Along the circumferential direction of the stator core 100 , the gap between two adjacent tooth surfaces 192 of the third punching sheet group 200 is denoted as d3 , where d3 > d2 .

[0111] In this embodiment, the structure of the stator core 100 is further defined so that the stator core 100 also includes a third punching sheet group 200. Along the axial direction of the stator core 100, the second punching sheet group 170 is located between the first punching sheet group 160 and the third punching sheet group 200. In other words, the third punching sheet group 200 is located at the end of the stator core 100.

[0112] The third punching plate group 200 includes an annular yoke 180 and a plurality of teeth 190. Each of the plurality of teeth 190 is connected to the inner circumferential wall of the annular yoke 180. The plurality of teeth 190 are spaced apart around the axis of the stator core 100. The stator yoke 110 includes the annular yoke 180, and each stator tooth 120 includes a tooth 190.

[0113] The structures of the first punching sheet group 160, the second punching sheet group 170, and the third punching sheet group 200 are defined so that the width of the stator slots 130 of the first punching sheet group 160 in the circumferential direction of the stator core 100 is recorded as d1, the width of the stator slots 130 of the second punching sheet group 170 in the circumferential direction of the stator core 100 is recorded as d2, and the width of the stator slots 130 of the third punching sheet group 200 in the circumferential direction of the stator core 100 is recorded as d3, and the relationship between d1, d2, and d3 is defined so as to satisfy: d3>d2>d1. In other words, along the axial direction of the stator core 100, the width of the slots of the first punching sheet group 160, the second punching sheet group 170, and the third punching sheet group 200 in the circumferential direction of the stator core 100 gradually increases. This configuration can reduce magnetic leakage and improve the output torque of the motor 1. In other words, the first punching sheet group 160, the second punching sheet group 170 and the third punching sheet group 200 are provided with different slot widths in the circumferential direction of the stator core 100, so that the armature reaction of the motor 1 can be improved, the voltage of the armature reaction of the motor 1 can be reduced, and the torque output of the motor 1 under high-speed conditions can be improved.

[0114] It can be understood that the first punching sheet group 160 with a smaller slot width in the circumferential direction of the stator core 100 is located in the middle of the stator core 100, and the third punching sheet group 200 with a larger slot width in the circumferential direction of the stator core 100 is located at the end of the stator core 100. In this way, the problem of the slot insulation of the stator 10 protruding from the inner diameter of the stator core 100 can be effectively prevented, thereby improving the reliability of the motor 1.

[0115] In other words, this arrangement takes into account both the leakage flux of the motor 1 and the blocking of the slot insulation of the stator 10 from protruding from the inner diameter of the stator core 100, which is beneficial to improving the safety and reliability of the use of the motor 1.

[0116] In this embodiment, there are multiple third punching sheet groups 200 .

[0117] In some other embodiments, the number of the third punching sheet group 200 is one.

[0118] As shown in FIG. 8 , the stator core 100 includes a first punching sheet group 160 , two second punching sheet groups 170 and two third punching sheet groups 200 .

[0119] For example, along the circumferential direction of the stator core 100, the slot width of the stator slot 130 of any one of the first punching group 160, the second punching group 170, and the third punching group 200 is greater than or equal to 1.8 mm and less than or equal to 4 mm. For example, the slot width is 2 mm, the slot width is 2.2 mm, the slot width is 2.4 mm, the slot width is 2.6 mm, the slot width is 2.8 mm, the slot width is 3 mm, the slot width is 3.2 mm, the slot width is 3.4 mm, the slot width is 3.6 mm, and the slot width is 3.8 mm, etc., which are not listed here one by one.

[0120] In some embodiments, as shown in FIG. 8 , the number of the first punching sheet groups 160 is denoted as m.

[0121] The number of the second punching sheet groups 170 is denoted as n.

[0122] A first punching sheet group 160 is disposed between any two adjacent second punching sheet groups 170 , where m≥1 and n≥2.

[0123] The axial height of the first punching plate group 160 is denoted as h1.

[0124] The axial height of the second punching plate group 170 is denoted as h2.

[0125] Among them, 0.05<(m×h1) / (n×h2)<0.2.

[0126] In this embodiment, the structure of the first punching sheet group 160 and the second punching sheet group 170 is defined such that the number of first punching sheet groups 160 is denoted as m, the number of second punching sheet groups 170 is denoted as n, m ≥ 1, n ≥ 2. Furthermore, a first punching sheet group 160 is provided between any two adjacent second punching sheet groups 170. In other words, a second punching sheet group 170 is provided at the axial end surface of each first punching sheet group 160.

[0127] This arrangement can meet the use requirements of setting different slot widths of the first punching sheet group 160 and the second punching sheet group 170 in the circumferential direction of the stator core 100, and makes the number of the first punching sheet group 160 smaller than the number of the second punching sheet group 170. In this way, the slot insulation of the stator 10 can be effectively prevented from protruding from the inner diameter of the stator core 100, which can improve the reliability of the motor 1 and help reduce the material input of the stator core 100, thereby helping to reduce the weight of the stator core 100 and reduce the production cost of the stator core 100.

[0128] It is understood that if the slot width of the punching sheet group in the circumferential direction of the stator core 100 is small, the magnetic flux leakage will be significantly increased, thus reducing the output torque of the motor 1. Therefore, the number of the first punching sheet group 160 is smaller than the number of the second punching sheet group 170 to balance the magnetic flux leakage of the motor 1 and prevent the slot insulation of the stator 10 from protruding from the inner diameter of the stator core 100, which is conducive to improving the safety and reliability of the motor 1.

[0129] The relationship between h1, h2, m, and n is defined to satisfy the following: 0.05 < (m × h1) / (n × h2) < 0.2. In other words, the relationship between the sum of the axial heights of all first punching groups 160 included in the stator core 100 and the sum of the axial heights of all second punching groups 170 included in the stator core 100 is defined. Because reducing the slot width of the second punching group 170 in the circumferential direction of the stator core 100 increases the risk of magnetic flux leakage in the stator 10, by defining the optimal ratio of the axial heights of the first punching group 160 and the second punching group 170, the risk of magnetic flux leakage can be minimized to the greatest extent possible. In other words, magnetic flux leakage can be reduced while ensuring the performance of the motor 1.

[0130] Illustratively, (m×h1) / (n×h2)=0.06, (m×h1) / (n×h2)=0.07, (m×h1) / (n×h2)=0.08, (m×h1) / (n×h2)=0.09, (m×h1) / (n×h2)=0.1, (m×h1) / (n×h2)=0.12, (m×h1) / (n×h2)=0.14, (m×h1) / (n×h2)=0.16 and (m×h1) / (n×h2)=0.18, etc., which are not listed here one by one.

[0131] 9 , the distance from the stator teeth 120 to the axis of the stator core 100 is denoted as D1 , and the distance from the outer peripheral wall of the stator yoke 110 to the axis of the stator core 100 is denoted as D2 .

[0132] Among them, 0.6≤D1 / D2≤0.7.

[0133] In this embodiment, the structure of the stator core 100 is further defined such that the distance from the stator teeth 120 to the axis of the stator core 100 is denoted as D1, and the distance from the outer peripheral wall of the stator yoke 110 to the axis of the stator core 100 is denoted as D2. That is, the inner diameter of the stator core 100 is denoted as D1, and the outer diameter of the stator core 100 is denoted as D2. Furthermore, D1 and D2 satisfy 0.6≤D1 / D2≤0.7.

[0134] This setting limits the matching dimensions of the inner diameter and outer diameter of the stator core 100. By optimizing the split ratio of the motor 1, the main magnetic field provided by the permanent magnet 950 of the motor 1 can be increased. Under the condition of the same back electromotive force, the number of turns of the stator winding 800 can be reduced, the anti-demagnetization ability of the motor 1 can be improved, and the safety and reliability of the use of the motor 1 can be further ensured.

[0135] When the inner diameter of the stator core 100 is increased, the outer diameter of the stator core 100 is also increased, so that the amount of magnets used can be increased and the power density of the motor 1 can be improved.

[0136] If D1 / D2 is greater than 0.7, the area of ​​the stator slots 130 of the stator 10 will be reduced, causing the stator teeth 120 and the yoke of the stator 10 to be saturated, and the armature flux to be sharply reduced, resulting in deterioration of the output power of the motor 1 .

[0137] In some embodiments, the ratio of D1 to D2 includes 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, etc., which are not listed here one by one.

[0138] In some embodiments, when the ratio of D1 to D2 is within the above range, the efficiency of the motor 1 is high and the copper loss of the motor 1 is low, that is, the efficiency, copper loss and iron loss of the motor 1 are taken into consideration.

[0139] As shown in FIG12 , when the relationship between D1 and D2 satisfies 0.6≤D1 / D2≤0.7, the armature reaction voltage is reduced and the output torque is increased.

[0140] As shown in FIG10 , a motor 1 according to some further embodiments of the present application includes: a stator 10 and a rotor 90 as in any of the above embodiments.

[0141] The plurality of stator teeth 120 enclose an assembly cavity 210 , and the rotor 90 is rotatably disposed in the assembly cavity 210 .

[0142] In this embodiment, the motor 1 includes a stator 10 and a rotor 90. The plurality of teeth 190 of the stator core 100 enclose an assembly cavity 210, and the rotor 90 is rotatably disposed in the assembly cavity 210. Since the motor 1 of the present application includes the stator 10 described in the first aspect, it possesses all the beneficial effects of the stator 10 described above, which will not be detailed here.

[0143] In some embodiments, as shown in FIG. 10 , the rotor 90 includes a core body 910 , a shaft hole 920 , a plurality of magnet slot groups 930 , and a plurality of slot groups 940 .

[0144] The shaft hole 920 is provided in the core body 910 .

[0145] A plurality of magnet slot groups 930 are provided on the core body 910 , and the plurality of magnet slot groups 930 are arranged at intervals around the shaft hole 920 .

[0146] A plurality of slit groups 940 are provided on the core body 910 , with one slit group 940 being arranged between each magnet slot group 930 and the outer peripheral wall of the core body 910 .

[0147] The slit group 940 includes an odd number of slits 942 .

[0148] In this embodiment, the rotor 90 includes a core body 910 , a shaft hole 920 , a plurality of magnet slot groups 930 , and a plurality of slot groups 940 .

[0149] A plurality of magnet slot groups 930 are spaced apart and arranged around the shaft hole 920 . The magnet slot groups 930 are used to mount permanent magnets 950 to form magnetic poles.

[0150] A plurality of slit groups 940 are spaced apart around the shaft hole 920 .

[0151] A slit group 940 is arranged between each magnet slot group 930 and the outer peripheral wall of the core body 910 .

[0152] The slit group 940 includes an odd number of slits 942 .

[0153] The core body 910 is applied to the motor 1, and the motor 1 is applied to the compressor 4. Since the compressor 4 is a pulsating load, the structure of the rotor 90 is rationally configured so that the slit group 940 on the core body 910 includes an odd number of slits 942. That is, each slit group 940 includes an odd number of slits 942. The odd number of slits 942 in each slit group 940 is arranged asymmetrically. The odd number of slits 942 matches the pulsating load of the compressor 4, making the output torque of the product more stable. In this way, the radial force density of the motor 1 can be effectively improved, and the noise and vibration level of the motor 1 can be improved, thereby improving the noise and vibration of the compressor 4.

[0154] In some embodiments, as shown in FIG. 10 and FIG. 14 , the rotor 90 further includes a plurality of permanent magnets 950 , and the stator 10 further includes a winding 800 .

[0155] A permanent magnet 950 is disposed in each magnet slot group 930 , and the permanent magnet 950 contains X% by mass of cerium.

[0156] The winding 800 is wound around the plurality of stator teeth 120 .

[0157] The weight of the plurality of permanent magnets 950 is denoted as Mp.

[0158] The weight of the winding 800 is denoted as Mc.

[0159] The back electromotive force value of the motor 1 at a rotation speed of 1000 rpm is recorded as Ke.

[0160] The maximum allowable operating voltage of the power devices of the controller of the motor 1 is denoted as Ub.

[0161] Among them, (Mp / Mc)×Ub×X%≤Ke.

[0162] In this embodiment, the rotor 90 further includes a plurality of permanent magnets 950 , and the stator 10 further includes a winding 800 .

[0163] The core body 910 is provided with a plurality of magnet slot groups 930 . Each magnet slot group 930 is provided with a permanent magnet 950 . The permanent magnet 950 contains X% cerium by mass.

[0164] The stator 10 includes a stator core 100 and a winding 800 . The stator core 100 includes a plurality of stator teeth 120 . The winding 800 is wound around the plurality of stator teeth 120 .

[0165] The weight of the plurality of permanent magnets 950 is denoted as Mp, the weight of the winding 800 is denoted as Mc, the back electromotive force value of the motor 1 at a speed of 1000 rpm is denoted as Ke, and the maximum allowable operating voltage of the power device of the controller of the motor 1 is denoted as Ub.

[0166] Among them, using permanent magnets 950 containing cerium as magnetic poles can reduce the content of praseodymium and neodymium elements in the permanent magnets 950. In this way, the production cost of the permanent magnets 950 can be reduced, and then the production cost of the motor 1 can be reduced, solving the problem in the related art that the cost of the motor 1 is high due to the high price of rare earth materials such as praseodymium and neodymium.

[0167] By replacing the relatively expensive praseodymium and neodymium elements in the permanent magnet 950 with the abundant and relatively cheap cerium element, the price of the permanent magnet 950 can be effectively reduced, thereby improving the cost-effectiveness of the motor 1. However, the introduction of the cerium element will reduce the coercive force of the permanent magnet 950 to a certain extent, thereby reducing the magnetic energy product of the permanent magnet 950, and weakening the magnetic properties of the rotor 90. In order to ensure that the air gap composite magnetic field remains unchanged, the magnetic field strength of the stator 10 is usually increased by increasing the amount of windings 800 used in the stator 10. At the same time, the operation of the motor 1 is usually regulated by a controller, and once the model of the power device in the controller is determined, the maximum operating voltage of the power device is determined accordingly. Since the rotor 90 magnetic field provided by the permanent magnet 950 of the motor 1 is not adjustable, weak magnetic control is usually required to prevent the load voltage of the motor 1 from exceeding the allowable value of the power device at high speeds. Simply increasing the magnetic field strength of stator 10 to compensate for the loss of the air gap composite magnetic field will increase the impact of the armature reaction of stator 10, which is not conducive to the output capacity of motor 1 during high-speed field weakening, thereby limiting the operating range of compressor 4. This requires a matching and balanced design of the magnetic fields of motor 1's stator and rotor 90, and reasonable adjustment of the material usage of motor 1's permanent magnets 950, windings 800, and other materials. Under the constraints of the maximum operating voltage of the power devices, the design value of motor 1's back EMF meets the field weakening overload capacity of motor 1, thereby improving the cost-effectiveness of motor 1.

[0168] It can be understood that when the load is symmetrical, the influence of the armature magnetomotive force on the fundamental wave of the main pole magnetic field is the armature reaction. The armature reaction will affect the performance of the motor 1. The influence of the armature reaction can be reduced from two aspects. First, the magnetic field of the stator 10 is weakened. Second, the magnetic field of the rotor 90 is enhanced. The magnetic field of the stator 10 is correlated with the parameters of the winding 800 wound on the stator teeth 120 of the stator core 100. The magnetic field of the rotor 90 is correlated with the parameters of the permanent magnet 950. Therefore, by optimizing the relationship between the weight Mp of multiple permanent magnets 950 and the weight Mc of the winding 800, the air gap synthetic magnetic field can be kept in a balanced state. In this way, the output capacity of the motor 1 at high speed and weak magnetic field can be improved, which is conducive to reducing the armature reaction.

[0169] It is understood that permanent magnets 950 contain cerium, and the amount of cerium used can also affect the magnetic field of rotor 90. If the mass percentage of cerium in permanent magnets 950 is too high, it will not be conducive to improving the magnetic field of rotor 90 and may aggravate armature reaction. If the mass percentage of cerium in permanent magnets 950 is too low, the production cost of rotor 90 will still be high.

[0170] It is understood that the back EMF value Ke of the motor 1 at 1000 rpm is correlated with the maximum allowable operating voltage Ub of the power devices of the controller of the motor 1. If the back EMF value Ke of the motor 1 at 1000 rpm is too high, the power devices may be easily broken down. If the back EMF value Ke of the motor 1 at 1000 rpm is too low, the performance of the motor 1 may not be effectively exerted.

[0171] Therefore, by rationally setting the relationship between the mass percentage (X%) of cerium in each permanent magnet 950, the weight (Mp) of the multiple permanent magnets 950, the weight (Mc) of the winding 800, the maximum allowable operating voltage (Ub) of the power components of the motor 1 controller, and the back EMF value (Ke) of the motor 1 at 1000 rpm, so that the following is satisfied: (Mp / Mc) × Ub × X% ≤ Ke, the cost-effectiveness of the motor 1 can be improved while reducing the impact of armature reaction under load. This helps enhance the load capacity of the motor 1 under high-speed, field-weakening conditions and reduces the production cost of the motor 1. Consequently, by using permanent magnets 950 with a higher cerium content, the praseodymium and neodymium content in the permanent magnets 950 can be reduced, achieving even greater cost reduction and efficiency gains.

[0172] As shown in FIG11 , a compressor 4 according to some further embodiments of the present application includes: a motor 1 as described in the above embodiments.

[0173] In this embodiment, the compressor 4 includes the motor 1 as described in the above embodiment, and therefore has all the beneficial effects of the above motor 1, which are not described one by one here.

[0174] A vehicle according to some further embodiments of the present application includes: a compressor 4 as described in the above embodiments.

[0175] In this embodiment, the vehicle includes the compressor 4 as described in the above embodiment, and therefore has all the beneficial effects of the above compressor 4, which are not described one by one here.

[0176] It is worth noting that the vehicle can be a new energy vehicle, which includes pure electric vehicles, extended-range electric vehicles, hybrid electric vehicles, fuel cell electric vehicles, hydrogen engine vehicles, etc.

[0177] In some embodiments, the stator 10 of the present application includes a stator core 100 , a first insulating frame 300 , a second insulating frame 400 , a winding 800 , and slot insulation paper 700 .

[0178] The stator core 100 includes a stator yoke 110 and stator teeth 120. The stator teeth 120 are connected to the inner circumferential wall of the stator yoke 110. A plurality of stator teeth 120 are spaced apart around the axis of the stator core 100. Two adjacent stator teeth 120 and the stator yoke 110 enclose a stator slot 130. A first insulating frame 300 is disposed at a first axial end 140 of the stator core 100. The first insulating frame 300 includes an extension section 610. A second insulating frame 400 is disposed at a second axial end 150 of the stator core 100. The winding 800 is wound around the stator teeth 120, the first insulating frame 300, and the second insulating frame 400. Slot insulation paper 700 is disposed within the stator slot 130, between the slot wall of the stator slot 130 and the winding 800. At the first axial end 140 of the stator core 100, the slot insulation paper 700 is attached to the extension section 610 at the notch of the stator slot 130. At the first axial end 140 of the stator core 100, the extension section 610 of the first insulating frame 300 is connected to the slot wall of the stator slot 130 at the notch of the stator slot 130, and forms a certain fitting position at the notch of the stator slot 130. After the stator 10 is assembled, along the circumference of the stator core 100, the gap value between the extension portions 600 of two adjacent insulating teeth 500 is recorded as d01, and the notch width of the stator slot 130 is recorded as T, where d01<T. This setting can not only improve the power density of the motor 1, but also ensure the reliability of the motor 1.

[0179] The stator core 100 includes: a first punching sheet group 160; a second punching sheet group 170, along the axial direction of the stator core 100, the second punching sheet group 170 is stacked on one side of the first punching sheet group 160, and the second punching sheet group 170 is closer to the end of the stator core 100 than the first punching sheet group 160, either the first punching sheet group 160 or the second punching sheet group 170 includes: an annular yoke 180, the stator yoke 110 includes an annular yoke 180; a plurality of teeth 190, the tooth 190 is connected to the inner circumferential wall of the annular yoke 180, each stator tooth 120 includes a tooth 190, and the end face of the tooth 190 facing the axis of the stator core 100 is a tooth surface 192; along the circumferential direction of the stator core 100, the gap value between two adjacent tooth surfaces 192 of the first punching sheet group 160 is different from the gap value between two adjacent tooth surfaces 192 of the second punching sheet group 170.

[0180] When the insulating teeth 500 of either the first insulating frame 300 or the second insulating frame 400 are provided with an extension portion 600 , along the circumferential direction of the stator core 100 , the gap value between the extension portions 600 of two adjacent insulating teeth 500 of the first insulating frame 300 is equal to the gap value between the extension portions 600 of two adjacent insulating teeth 500 of the second insulating frame 400 .

[0181] The number of first lamination groups 160 is denoted as m, and the number of second lamination groups 170 is denoted as n. A first lamination group 160 is provided between any two adjacent second lamination groups 170, where m ≥ 1 and n ≥ 2. The axial height of the first lamination group 160 is denoted as h1, and the axial height of the second lamination group 170 is denoted as h2, where 0.05 < (m × h1) / (n × h2) < 0.2. Since the slot width of the second lamination group 170 is reduced, there is a risk of increased magnetic flux leakage in the stator 10. Therefore, by defining an optimal ratio between the axial heights of the first lamination group 160 and the second lamination group 170, the risk of magnetic flux leakage can be minimized. That is, magnetic flux leakage can be reduced while ensuring the performance of the motor 1.

[0182] For example, the axial height of the stator core 100 is 25 mm, and the stator core 100 includes one first punching group 160 and two second punching groups 170. The axial height of the first punching group 160 is 3 mm, and the axial height of the second punching group 170 is 11 mm. Therefore, (m × h1) / (n × h2) = (1 × 3) / (2 × 11) ≈ 0.14.

[0183] For example, the axial height of the stator core 100 is 55 mm, and the stator core 100 includes one first lamination group 160 and two second lamination groups 170. The axial height of the first lamination group 160 is 3 mm, and the axial height of the second lamination group 170 is 23.5 mm. Therefore, (m × h1) / (n × h2) = (1 × 3) / (2 × 23.5) ≈ 0.06. This ratio ensures a balanced performance and reliability of the motor 1.

[0184] The distance between stator teeth 120 and the axis of stator core 100 is denoted as D1, and the distance between the outer peripheral wall of stator yoke 110 and the axis of stator core 100 is denoted as D2, where 0.6 ≤ D1 / D2 ≤ 0.7. By optimizing the split ratio of motor 1, the main magnetic field provided by permanent magnets 950 can be increased. Under the same back EMF conditions, the number of turns of winding 800 can be reduced, improving the demagnetization resistance of motor 1 and further ensuring the reliability of motor 1.

[0185] As shown in Figure 10 , along the radial direction of rotor 90, the minimum clearance between the outer circumferential wall of rotor 90 and the inner circumferential wall of stator 10 is denoted as δ, where 0.08 < δ / d2 < 0.15. By optimizing the relationship between d2 and δ, the power density of motor 1 can be maximized.

[0186] The stator core 100 includes a plurality of segmented cores, which are connected end to end around the axis of the stator core 100, and each segmented core includes a plurality of stacked punches. That is, the first punching group 160 includes a plurality of first segmented punches, which are connected end to end around the axis of the stator core 100, the second punching group 170 includes a plurality of second segmented punches, which are connected end to end around the axis of the stator core 100, and the third punching group 200 includes a plurality of third segmented punches, which are connected end to end around the axis of the stator core 100. Along the axial direction of the stator core 100, each segmented core includes a first segmented punch, a second segmented punch, and a third segmented punch. This arrangement can greatly improve the slot fill rate of the motor 1, further improve the power density of the motor 1, and ensure that the product performance requirements are met without using heavy rare earth elements.

[0187] 11 , the compressor 4 includes a cover plate 41, an inverter 42, a drive shaft 43, a suction port 44, a housing 45, a compression unit 46, and a discharge port 47. The compressor 4 includes an electric compressor.

[0188] The motor 1 is used to rotate the drive shaft 43 . The motor 1 includes a stator 10 and a rotor 90 .

[0189] The compression unit 46 is driven by the drive shaft 43 to compress the refrigerant.

[0190] The frequency converter 42 is used to control the permanent magnet synchronous motor.

[0191] The housing 45 has a cavity, and the motor 1 is disposed inside the cavity. The drive shaft 43 is fixed to the rotor 90 , and the rotor 90 is disposed inside the stator 10 , and the rotor 90 can rotate together with the drive shaft 43 .

[0192] The motor 1 can ensure both the power density and the reliability of the motor 1 without using heavy rare earth terbium.

[0193] The motor 1 of the present application can not only ensure the power density of the motor 1 but also reduce the amount of heavy rare earth elements used.

[0194] For example, along the axial direction of the stator core 100, the orthographic projection of the slot walls of the stator slots 130 of the third punching sheet group 200 onto the second punching sheet group 170 is located outside the slot walls of the stator slots 130 of the second punching sheet group 170. The cross-sectional area of ​​the stator slots 130 of the third punching sheet group 200 is greater than the cross-sectional area of ​​the stator slots 130 of the second punching sheet group 170. That is, the slot walls of the stator slots 130 of the third punching sheet group 200 and the second punching sheet group 170 enclose a sunken groove, that is, at least a portion of the slot walls of the stator slots 130 of the third punching sheet group 200 and the slot walls of the stator slots 130 of the second punching sheet group 170 form a stepped structure.

[0195] After the stator core 100, the first insulating frame 300, and the second insulating frame 400 are assembled, the first insulating frame 300 and the second insulating frame 400 abut against the recessed groove, and the first insulating frame 300 and the second insulating frame 400 can cover the edges of the stator slots 130 of the third punching sheet group 200. In this way, while ensuring the performance of the motor 1, the height of the stator 10 can be reduced along the axial direction of the stator core 100, which helps reduce the space occupied by the stator 10 in the interior of the motor 1, and helps reduce the volume and weight of the motor 1.

[0196] This arrangement is also beneficial to increasing the matching area and matching angle between the first insulating frame 300 , the second insulating frame 400 and the stator core 100 , and is beneficial to improving the stability and reliability of the matching between the first insulating frame 300 , the second insulating frame 400 and the stator core 100 .

[0197] In addition, this arrangement can shorten the length of each turn of the winding 800, reduce the amount of winding 800 used, and reduce the production cost of the product.

[0198] The tooth surface 192 of at least one of the first punching group 160, the second punching group 170 and the third punching group 200 includes an arc segment and a connecting segment. The connecting segment is connected to one side of the arc segment in the circumferential direction of the stator core 100. The arc segment is closer to the axis of the stator core 100 than the connecting segment.

[0199] The tooth surface 192 of the first punching sheet group 160 includes an arc segment and a connecting segment, or the tooth surface 192 of the second punching sheet group 170 includes an arc segment and a connecting segment, or the tooth surface 192 of the third punching sheet group 200 includes an arc segment and a connecting segment, or the tooth surface 192 of the first punching sheet group 160 and the tooth surface 192 of the second punching sheet group 170 both include an arc segment and a connecting segment, or the tooth surface 192 of the first punching sheet group 160 and the tooth surface 192 of the third punching sheet group 200 both include an arc segment and a connecting segment, or the tooth surface 192 of the second punching sheet group 170 and the tooth surface 192 of the third punching sheet group 200 both include an arc segment and a connecting segment, or any one of the tooth surface 192 of the first punching sheet group 160, the tooth surface 192 of the second punching sheet group 170 and the tooth surface 192 of the third punching sheet group 200 includes an arc segment and a connecting segment.

[0200] The connecting section is connected to one side of the circular arc section, and the connecting section and the circular arc section are arranged along the circumference of the stator core 100. The circular arc section is closer to the axis of the stator core 100 than the connecting section. That is, the distance between the circular arc section and the circumference of the stator core 100 is shorter than the distance between the connecting section and the axis of the stator core 100.

[0201] This arrangement realizes the tooth top chamfering of the tooth portion 190 of the stator core 100 , which is beneficial to improving the distribution of the air gap synthetic magnetic field of the motor 1 , can alleviate the armature reaction, and can enhance the torque output of the motor 1 under high-speed conditions.

[0202] Exemplarily, the connecting segment includes any one of the following or a combination thereof: a plane segment, a folded surface segment, and a curved surface segment.

[0203] For example, the connecting segment includes a plane segment. For example, the connecting segment includes a folded surface segment. For example, the connecting segment includes a curved surface segment. For example, the connecting segment includes a plane segment and a folded surface segment. For example, the connecting segment includes a plane segment and a curved surface segment. For example, the connecting segment includes a folded surface segment and a curved surface segment. For example, the connecting segment includes a plane segment, a folded surface segment, and a curved surface segment.

[0204] This arrangement can meet the requirement that the distance between the connecting segment and the axis of the stator core 100 is greater than the distance between the arc segment and the axis of the stator core 100 , thereby improving the armature reaction.

[0205] For example, the minimum clearance between the outer circumferential wall of the rotor 90 and the inner circumferential wall of the stator 10 along the radial direction of the rotor 90 is denoted as δ, where 0.08<δ / d2<0.15. By optimizing the ratio of the slot width of the second punching sheet group 170 to the clearance between the stator and rotor 90, the power density of the motor 1 can be maintained while improving the radial force density of the motor 1 and preventing noise degradation.

[0206] If δ / d2 is less than or equal to 0.08, the air gap magnetic flux density of the motor 1 will increase, the radial force density of the motor 1 will increase, and the operating noise of the motor 1 will increase.

[0207] If δ / d2 is greater than or equal to 0.15, the magnetic resistance is large, the energy consumption of the motor 1 is large, the output torque of the motor 1 is reduced, and the performance of the motor 1 is reduced.

[0208] Exemplarily, the core body 910 includes multiple pole center lines, each slot group 940 is located at a pole center line, a portion of the slots 942 of the slot group 940 are located on the windward side of the pole center line, and another portion of the slots 942 of the slot group 940 are located on the leeward side of the pole center line.

[0209] The core body 910 includes a plurality of magnetic pole center lines, and any of the plurality of magnetic pole center lines has a windward side and a leeward side.

[0210] For example, a line connecting the center of the magnet slot group 930 and the center of the axial hole 920 of the core body 910 constitutes a magnetic pole center line, which is referred to as the d-axis.

[0211] It can be understood that the rotor 90 rotates in the direction from the leeward side of the magnetic pole centerline to the windward side of the magnetic pole centerline. It can also be said that the windward side of the magnetic pole centerline is the leading side of the magnetic pole centerline, and the leeward side of the magnetic pole centerline is the lagging side of the magnetic pole centerline.

[0212] By properly arranging the odd-numbered slits 942 of slit group 940 in conjunction with the magnetic pole centerline, a portion of slits 942 of slit group 940 is located on the windward side of the magnetic pole centerline, while another portion of slits 942 of slit group 940 is located on the leeward side of the magnetic pole centerline. In other words, slits 942 are arranged on both the windward side and the leeward side of the magnetic pole centerline. In other words, the arrangement positions of the odd-numbered slits 942 of slit group 940 relative to the magnetic pole centerline are divided. Since each slit group 940 has an odd number of slits 942, and the odd-numbered slits 942 are distributed on opposite sides of the magnetic pole centerline (i.e., the windward side and the leeward side of the magnetic pole centerline), an even number of slits 942 are arranged on the windward side of the magnetic pole centerline, and an odd number of slits 942 are arranged on the leeward side of the magnetic pole centerline. Alternatively, an odd number of slits 942 are arranged on the windward side of the magnetic pole centerline, and an even number of slits 942 are arranged on the leeward side of the magnetic pole centerline. In other words, the odd-numbered slits 942 of the slit group 940 are asymmetrically arranged along the corresponding magnetic pole centerline.

[0213] Exemplarily, the number of slot groups 940 is an even number, and the number of magnet slot groups 930 is an even number. The number of slot groups 940 matches the number of magnet slot groups 930, with each magnet slot group 930 corresponding to a slot group 940. The line containing the magnetic pole centerline corresponds to two slot groups 940, which are referred to as the first slot group and the second slot group, respectively. The axis of the core body 910 is located between the first slot group and the second slot group. After the first slot group rotates 180° in the direction of rotation of the rotor 90, the slots 942 of the first slot group overlap with the slots 942 of the second slot group. Similarly, after the second slot group rotates 180° in the direction of rotation of the rotor 90, the slots 942 of the second slot group overlap with the slots 942 of the first slot group.

[0214] This arrangement prevents the center of mass of the rotor 90 from deviating from the axis of rotation during rotation, thus maintaining the dynamic balance of the motor 1. It also prevents local wear and tear, and significantly reduces noise.

[0215] Taking the 12-slot 8-pole motor 1 as an example, the odd-numbered slits 942 of the slit group 940 are asymmetrically arranged along the center line of the magnetic pole. The radial force density of the 4th-order 16th-order mechanical frequency is reduced by 53%, and the noise in this frequency band of the compressor 4 is reduced by 5dB, with obvious noise improvement effect.

[0216] For example, the number of the slits 942 on the windward side is greater than the number of the slits 942 on the leeward side. This arrangement is beneficial for reducing the no-load cogging torque and load electromagnetic torque pulsation of the motor 1.

[0217] For example, the number of slits 942 located on the windward side is an even number, and the number of slits 942 located on the leeward side is an odd number. This setting can meet the use requirements of the odd number of slits 942 of the slit group 940 being asymmetrically arranged along the corresponding magnetic pole center line. This setting can ensure that the waveform of the air gap magnetic density of the motor 1 under load conditions is close to sinusoidal, thereby reducing the torque pulsation during the operation of the motor 1. Improve the vibration noise during the operation of the motor 1. At the same time, this setting can ensure the dynamic balance of the rotor 90 during rotation, reduce the swing of the shaft structure of the compressor 4, and effectively improve the content of each harmonic of the air gap magnetic density of the motor 1. In this way, on the one hand, the iron loss of the stator 10 of the motor 1 is reduced, which is conducive to improving the operating efficiency of the motor 1. On the other hand, it can improve the vibration noise of the motor 1, thereby reducing the operating noise of the compressor 4.

[0218] For example, each slit group 940 includes a plurality of first slits and a plurality of second slits, wherein the plurality of first slits are symmetrically arranged about the magnetic pole centerline, and the second slits are located to one side of the plurality of first slits. This arrangement can meet the use requirement of the odd-numbered slits 942 of the slit group 940 being asymmetrically arranged about the corresponding magnetic pole centerline.

[0219] In some embodiments, the two first slits are symmetrically arranged with the magnetic pole centerline as the symmetry axis. Each first slit includes a first end and a second end. The first ends of the two first slits are adjacent to each other, the second ends of the two first slits are far away from each other, and the second end is located between the first end and the magnet slot group 930. That is, the two first slits are configured into an "eight"-shaped structure. The angle formed between the two first slits is recorded as α, and the angle α is an acute angle. This arrangement reasonably utilizes the existing arrangement structure of the core body 910 to ensure the occupancy rate of the slit group 940 to the core body 910.

[0220] In some embodiments, the magnet slot includes two slot bodies, each including a third end and a fourth end. The third ends of the two slot bodies are spaced apart from each other, while the fourth ends of the two slot bodies are adjacent to each other, with the fourth ends located between the third ends and the axis of the core body 910. In other words, the two slot bodies are configured in a "V" shape. The angle formed between the first slit and the slot body, located on the same side of the magnetic pole centerline, is denoted as β, and is an acute angle.

[0221] The stator teeth 120 include a tooth body and a tooth shoe. The tooth body extends radially along the core body 910. The tooth shoe is connected to the tooth body and is located at the circumferential end surface of the tooth body. The width of the tooth body along the circumference of the core body 910 is Bt.

[0222] The width of the permanent magnet 950 along the circumference of the core body 910 is denoted as H.

[0223] By properly setting the angle α formed between the two first slits, the angle β formed between the first slit located on the same side of the magnetic pole centerline and the slot body, the circumferential width H of the permanent magnet 950, and the circumferential width Bt of the tooth body, the relationship is satisfied: H < α / β × Bt ≤ 3.4 mm, and 1.5 mm ≤ H ≤ 2 mm. This setting can reduce the no-load cogging torque of motor 1 and reduce load torque pulsation. At the same time, this setting ensures that the magnetic field at the stator core 100 does not oversaturate, which is beneficial for improving the output capacity of motor 1.

[0224] Exemplarily, the second slit is located on the windward side of the magnetic pole centerline. The slit group 940 includes a plurality of first slits and a second slit. The plurality of first slits are symmetrically arranged with the magnetic pole centerline as the symmetry axis, and the second slit is located on the windward side of the magnetic pole centerline.

[0225] That is to say, the number of slits 942 located on the windward side of the center line of the magnetic pole is greater than the number of slits 942 located on the leeward side of the center line of the magnetic pole. This setting can ensure that the waveform of the air gap magnetic density of the motor 1 under load conditions is close to a sine wave, thereby reducing the torque pulsation during the operation of the motor 1. Improve the vibration noise during the operation of the motor 1. At the same time, this setting can ensure the dynamic balance of the rotor 90 during the rotation process, reduce the swing of the shaft structure of the compressor 4, and can effectively improve the content of each harmonic of the air gap magnetic density of the motor 1. In this way, on the one hand, the iron loss of the stator 10 of the motor 1 is reduced, which is conducive to improving the operating efficiency of the motor 1. On the other hand, it can improve the vibration noise of the motor 1, thereby reducing the operating noise of the compressor 4.

[0226] Exemplarily, the first slit on the windward side is arranged close to the center line of the magnetic pole, and the second slit is located on the side of the first slit away from the center line of the magnetic pole.

[0227] The first and second slits on the windward side are arranged so that the first slit on the windward side is located immediately adjacent to the magnetic pole centerline, and the second slit is located on the side of the first slit that is further from the magnetic pole centerline. In other words, the second slit is located outside the first slit. In other words, the first slit is closer to the magnetic pole centerline than the second slit.

[0228] The load on compressor 4 is not constant but rather fluctuates periodically. Positioning the second slit outside the first slit facilitates ensuring a near-sinusoidal waveform of the air gap flux density of motor 1 under load conditions, thereby reducing torque pulsation and improving vibration and noise during operation. Furthermore, the asymmetric structure ensures the dynamic balance of rotor 90 during rotation, reduces the oscillation of the compressor 4 shaft structure, and effectively improves the harmonic content of the air gap flux density of motor 1.

[0229] For example, the second slit is closer to the magnetic pole centerline than the first slit. That is, the second slit is located in close proximity to the magnetic pole centerline, while the first slit is located further away from the magnetic pole centerline. Alternatively, the distance from the second slit to the magnetic pole centerline is smaller than the distance from the first slit located on the windward side to the magnetic pole centerline, and the second slit is located inward of the first slit.

[0230] The load on compressor 4 is not constant but rather fluctuates periodically. This configuration ensures that the waveform of the air gap flux density of motor 1, while maintaining load, is close to a sinusoidal waveform, thereby reducing torque pulsation and improving vibration and noise during operation. Furthermore, the asymmetric configuration ensures the dynamic balance of rotor 90 during rotation, reduces the oscillation of the compressor 4 shaft system, and effectively improves the harmonic content of the air gap flux density of motor 1.

[0231] For example, on the axial end face of the core body 910, adjacent magnet slot groups 930 in the plurality of magnet slot groups 930 have an interpole centerline between them. Along the radial direction of the rotor 90, the minimum gap between the outer circumferential wall of the rotor 90 and the inner circumferential wall of the stator 10 is denoted as gmin, located at the magnetic pole centerline of the core body 910. The maximum gap between the outer circumferential wall of the rotor 90 and the inner circumferential wall of the stator 10 is denoted as gmax, located at the interpole centerline. Where 0.6 ≤ gmin / gmax ≤ 0.8. Due to manufacturing process limitations, the minimum gap between the outer circumferential wall of the rotor 90 and the inner circumferential wall of the stator 10 is gmin ≥ 0.4 mm. Assuming gmin = 0.45 mm, a too small gmin / gmax ratio increases gmax, increasing the equivalent air gap of the motor 1 and reducing the effective output torque. A too large gmin / gmax ratio increases gmax, resulting in a high air gap flux density and a reduced double-harmonic radial force density, hindering noise reduction in the motor 1. As shown in FIG15 , the present application further optimizes the back electromotive force waveform of the motor 1 , improves the torque pulsation of the motor 1 under load conditions, has the effect of improving the operating noise of the motor 1 and the compressor 4 , and optimizes the 2-fold frequency radial force density.

[0232] In some embodiments, the inter-pole centerline is also referred to as the adjacent magnetic pole centerline, abbreviated as q-axis.

[0233] Illustratively, gmin / gmax=0.62, gmin / gmax=0.64, gmin / gmax=0.66, gmin / gmax=0.68, gmin / gmax=0.7, gmin / gmax=0.72, gmin / gmax=0.74, gmin / gmax=0.76 and gmin / gmax=0.78, etc., are not listed here one by one.

[0234] For example, Mp, Mc, Ub, and X% satisfy the following: 0.14 × Ke ≤ (Mp / Mc) × Ub × X% ≤ 0.69 × Ke. This improves the cost-effectiveness of motor 1 while reducing the impact of armature reaction when motor 1 is loaded, and enhancing the load capacity of motor 1 during high-speed field weakening.

[0235] For example, the weight of the core body 910 is recorded as Mr, wherein 0.17≤Mp / Mr≤0.26. This ensures that the permanent magnetic field strength of the rotor 90 is within a reasonable range, which is beneficial to improving the torque output capacity of the motor 1.

[0236] For example, the mass percentage of cerium in the permanent magnet 950 satisfies: 2%<X%<6%. This setting takes into account both the performance of the motor 1 and the production cost of the motor 1.

[0237] That is, adding the inexpensive and abundant cerium element to permanent magnet 950 can reduce the use of expensive and scarce heavy rare earth elements, thereby reducing the production cost of motor 1. In other words, the cost of permanent magnet 950 can be reduced while maintaining the performance of motor 1, thereby improving the cost-effectiveness of motor 1.

[0238] If the mass percentage of cerium in the permanent magnet 950 is greater than or equal to 6%, the coercive force of the permanent magnet 950 will decrease, which will reduce the magnetic energy product of the permanent magnet 950 and weaken the magnetic properties of the rotor 90, thereby affecting the anti-demagnetization ability and efficiency of the motor 1, causing demagnetization of the rotor 90 during operation, and reducing the reliability and stability of the motor 1.

[0239] If the mass percentage of cerium in the permanent magnet 950 is less than or equal to 2%, the degree of replacement of praseodymium with neodymium is limited, which limits the extent of reducing the production cost of the motor 1.

[0240] In some embodiments, the mass percentage of cerium in the permanent magnet 950 includes 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, etc., which are not listed here one by one.

[0241] For example, the maximum allowable operating voltage Ub=650 V, or the maximum allowable operating voltage Ub=1200 V. The value of the maximum allowable operating voltage of the power device of the controller of the motor 1 is further limited.

[0242] For example, the maximum allowable operating voltage Ub=650V, or the maximum allowable operating voltage Ub=1200V.

[0243] The power devices of the controller of the motor 1 include, but are not limited to, SiC (silicon carbide) power devices, IGBT (Insulated Gate Bipolar Transistor) and GaN (gallium nitride) power devices.

[0244] The maximum allowable operating voltage of the power device of the controller is equal to 650V, or the maximum allowable operating voltage of the power device of the controller is equal to 1200V. At this time, the efficiency of the controller of motor 1 is relatively high. When the maximum allowable operating voltage of the power device is 650V, it can be used in occasions where the rated output DC voltage of the battery pack is 500V and below. When the maximum allowable operating voltage of the power device is 1200V, it can be used in occasions where the rated output DC voltage of the battery pack is 800V and below. The voltage resistance levels of power devices with a maximum allowable operating voltage of 650V and power devices with a maximum allowable operating voltage of 1200V can cover the current common application scenarios of new energy electric vehicles, and can give full play to the efficiency advantages of motor 1.

[0245] Exemplarily, the residual magnetic flux density Br of the permanent magnet 950 at 20°C satisfies: 1.2T≤Br≤1.5T. The structure of the permanent magnet 950 is further defined so that the residual magnetic flux density of the permanent magnet 950 at 20°C is recorded as Br, Br is greater than or equal to 1.2T, and Br is less than or equal to 1.5T. This setting can ensure that the magnetic field strength of the rotor 90 is within a reasonable range. Since the magnetic field of the rotor 90 is not adjustable, if the value of the residual magnetic flux density Br of the permanent magnet 950 at 20°C is greater than 1.5T, then the high-speed weak magnetic operation of the motor 1 will be limited. If the residual magnetic flux density Br of the permanent magnet 950 at 20°C is lower than 1.2T, then the motor 1 cannot provide sufficient output capacity.

[0246] For example, the intrinsic coercivity Hcj of permanent magnet 950 at 20°C satisfies the following conditions: 21.3 kOe ≤ Hcj ≤ 25.2 kOe. The structure of permanent magnet 950 is further defined such that the intrinsic coercivity of permanent magnet 950 at 20°C is denoted as Hcj, and Hcj is greater than or equal to 21.3 kOe, and Hcj is less than or equal to 25.2 kOe. The intrinsic coercivity of permanent magnet 950 is a key indicator of its resistance to demagnetization. If Hcj is less than 21.3 kOe, the resistance to demagnetization of permanent magnet 950 is weak, and irreversible demagnetization may occur during operation of motor 1. If Hcj is greater than 25.2 kOe, the use of heavy rare earth elements increases, dramatically increasing costs and hindering the cost-effectiveness of motor 1. As shown in Figures 2 and 3, slot insulation paper 700 includes phase insulation 710.

[0247] In this application, the term "plurality" refers to two or more, unless otherwise specified. Terms such as "installed," "connected," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean fixed, removable, or integrally connected; and "connected" can mean directly or indirectly through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0248] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A stator, wherein: include: A stator core, the stator core comprising a stator yoke and a plurality of stator teeth, each of the stator teeth being connected to an inner peripheral wall of the stator yoke, the plurality of stator teeth being arranged at intervals around an axis of the stator core, two adjacent stator teeth and the stator yoke enclosing a stator slot, and the stator core having a first axial end and a second axial end; a first insulating frame, disposed at the first end; a second insulating frame, disposed at the second end, wherein either the first insulating frame or the second insulating frame comprises a plurality of insulating teeth, each of the stator teeth is connected to one of the insulating teeth, and the insulating teeth of at least one of the first insulating frame and the second insulating frame are provided with an extension portion, and the extension portion is located at a notch of the stator slot; Slot insulation paper is arranged in the stator slot, and the slot insulation paper abuts against the extension part, and the extension part can at least limit the slot insulation paper in the radial direction of the stator core; Wherein, along the circumferential direction of the stator core, the gap value between the extension portions of two adjacent insulating teeth is recorded as d01, and the slot width of the stator slot is recorded as T, wherein d01<T.

2. The stator according to claim 1, wherein: The extension portion is connected to a slot wall of the stator slot.

3. The stator according to claim 1 or 2, wherein: The insulating tooth provided with the extension portion comprises a tooth body, the tooth body is provided with a slot, and the end of the stator tooth is inserted into the slot; The extension portion is connected to the end face of the tooth body facing the axis of the stator core, and the extension portion includes two extension sections, which are arranged at intervals in the circumferential direction of the stator core, each of the extension sections extends into the slot opening of a stator slot, and each of the extension sections abuts against the slot insulation paper.

4. The stator according to any one of claims 1 to 3, wherein: When the insulating teeth of either the first insulating frame or the second insulating frame are provided with the extension portion, along the circumferential direction of the stator core, the gap value of the extension portions of two adjacent insulating teeth of the first insulating frame is equal to the gap value of the extension portions of two adjacent insulating teeth of the second insulating frame.

5. The stator according to any one of claims 1 to 4, wherein: The stator core comprises: The first punching group; A second punching sheet group, along the axial direction of the stator core, the second punching sheet group is stacked on one side of the first punching sheet group, and the second punching sheet group is closer to the end of the stator core than the first punching sheet group, and either the first punching sheet group or the second punching sheet group includes: an annular yoke, the stator yoke comprising the annular yoke; A plurality of tooth portions, wherein the tooth portions are connected to the inner peripheral wall of the annular yoke portion, each of the stator teeth comprises one tooth portion, and the end surface of the tooth portion facing the axis of the stator core is a tooth surface; Along the circumferential direction of the stator core, a gap value between two adjacent tooth surfaces of the first punching sheet group is different from a gap value between two adjacent tooth surfaces of the second punching sheet group.

6. The stator according to claim 5, wherein: Along the circumferential direction of the stator core, the gap value between two adjacent tooth surfaces of the first punching sheet group is recorded as d1, and the gap value between two adjacent tooth surfaces of the second punching sheet group is recorded as d2, wherein d2>d1≥d01.

7. The stator according to claim 6, wherein: The d1 and the d2 satisfy: 1.5<d2 / d1<3.

8. The stator according to claim 6 or 7, wherein: The stator core further comprises: a third punching sheet group, wherein the second punching sheet group is located between the first punching sheet group and the third punching sheet group; The third punching sheet group includes the annular yoke and the plurality of tooth portions. Along the circumferential direction of the stator core, the gap value between two adjacent tooth surfaces of the third punching sheet group is recorded as d3, wherein d3>d2.

9. The stator according to any one of claims 5 to 8, wherein: The number of the first punching sheet groups is recorded as m, the number of the second punching sheet groups is recorded as n, and one first punching sheet group is arranged between any two adjacent second punching sheet groups, m≥1, n≥2; The axial height of the first punching sheet group is recorded as h1, and the axial height of the second punching sheet group is recorded as h2; Among them, 0.05<(m×h1) / (n×h2)<0.

2.

10. The stator according to any one of claims 1 to 9, wherein: The distance from the stator teeth to the axis of the stator core is recorded as D1, and the distance from the outer peripheral wall of the stator yoke to the axis of the stator core is recorded as D2, wherein 0.6≤D1 / D2≤0.

7.

11. A motor, wherein: include: The stator according to any one of claims 1 to 10, wherein the plurality of stator teeth enclose an assembly cavity; A rotor is rotatably arranged in the assembly cavity.

12. The electric machine according to claim 11, wherein The rotor comprises: Core body; An axial hole is provided in the core body; A plurality of magnet slot groups are provided on the core body, and the plurality of magnet slot groups are arranged at intervals around the shaft hole; A plurality of slit groups are provided on the core body, one slit group is arranged between each magnet slot group and the outer peripheral wall of the core body, and the slit group includes an odd number of slits.

13. The electric machine according to claim 12, wherein: The rotor further comprises a plurality of permanent magnets, each of the magnet slot groups is provided with one permanent magnet, and the permanent magnets contain X% cerium by mass; The stator further comprises a winding, wherein the winding is wound on the plurality of stator teeth; The weight of the multiple permanent magnets is denoted as Mp, the weight of the winding is denoted as Mc, the back electromotive force value of the motor at a speed of 1000 rpm is denoted as Ke, and the maximum allowable operating voltage of the power device of the controller of the motor is denoted as Ub, wherein (Mp / Mc)×Ub×X%≤Ke.

14. A compressor, wherein: include: A motor as claimed in any one of claims 11 to 13.

15. A vehicle, wherein: include: The compressor of claim 14.

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