Motor, compressor, and vehicle

Abstract

A motor, a compressor, and a vehicle. The motor (1) comprises a stator (10); the stator comprises a stator core (100); every two adjacent stator teeth (110) and a stator yoke (116) enclose to form a stator slot (120); each stator tooth comprises a tooth body (112), a minimum value of the circumferential width of the tooth body is t, and the width of a slot opening (122) of each stator slot in the circumferential direction of the stator is recorded as k1; an angle α is formed between straight slot sections (335) of every two magnet slots (332), and the circumferential width of the straight slot sections is H; multiple flux-modulating slot groups (340) are provided on a core body (310) of a rotor core (300); each flux-modulating slot group comprises a first flux-modulating slot (342) and two second flux-modulating slots (344); an angle θ is formed between the adjacent walls of a connecting slot section (350) of the first flux-modulating slot and a connecting slot section (350) of the second flux-modulating slot, and the width of flux-modulating slots (341) in the circumferential direction of a rotor (30) is recorded as k2. An air gap (60) is enclosed between the stator and the rotor, and a minimum value of the air gap in the direction from the rotor to the stator is recorded as δ, wherein k1×0.25≤1.25×α×k2×δ / (θ×H)≤t.

Description

Motors, compressors and vehicles

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on January 31, 2024, with application number "202410133858.9" and invention name "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 motor, a compressor and a vehicle. Background Art

[0003] With the rapid adoption of new energy vehicles, users are increasingly demanding cooling and heating in their cabins. Electric compressors, driven by their internal permanent magnet motors, provide convenient interior temperature adjustment for drivers. However, conventional permanent magnet motors generate significant vibration and noise during operation, making them easily perceptible to drivers and significantly impacting driving comfort. 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 provides a motor.

[0006] A second aspect of the present application provides a compressor.

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

[0008] In view of this, the first aspect of the present application proposes a motor, comprising: a stator, the stator comprising a stator core, the stator core comprising a plurality of stator teeth and a stator yoke, the stator teeth 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, the plurality of stator teeth enclosing a mounting cavity, two adjacent stator teeth and the stator yoke enclosing a stator slot, the stator teeth comprising a tooth body, the minimum circumferential width of the tooth body being t, the width of the stator slot opening in the circumferential direction of the stator being denoted as k1; a rotor, rotatable The rotor is rotatably arranged in the installation cavity, and the rotor includes a rotor core, and the rotor core includes: an iron core body; an axial hole, which is arranged in the iron core body; a plurality of magnet slot groups, which are arranged in the iron core body, and the plurality of magnet slot groups are arranged around the axial hole at intervals, each magnet slot group includes two magnet slots, and each magnet slot includes a first slot end close to the axial hole, a second slot end away from the axial hole, and a straight slot section, the straight slot section is connected between the first slot end and the second slot end, the first slot ends of the two magnet slots are adjacent to each other, the second slot ends of the two magnet slots are away from each other, and the two magnet slots are spaced apart. The angle between the straight slot sections of the body slot is α, and the circumferential width of the straight slot section is H; multiple magnetic tuning slot groups are provided in the core body, and a magnetic tuning slot group is provided between each magnet slot group and the outer peripheral wall of the core body, and each magnetic tuning slot group includes multiple magnetic tuning slots, and the multiple magnetic tuning slots include a first magnetic tuning slot and two second magnetic tuning slots, and the first magnetic tuning slot is located between the two second magnetic tuning slots, and the first magnetic tuning slot and the second magnetic tuning slot both include a third slot end close to the axis hole, a fourth slot end away from the axis hole, and a connecting slot section, and the connecting slot section is connected to Between the third slot end and the fourth slot end, the third slot ends of the two second magnetic tuning slots are far away from each other, and the fourth slot ends of the two second magnetic tuning slots are close to each other. The angle between the slot walls of the connecting slot section of the first magnetic tuning slot and the connecting slot section of the second magnetic tuning slot is θ, and the width of the magnetic tuning slot in the circumferential direction of the rotor is denoted as k2. An air gap is enclosed between the stator and the rotor, and the minimum value of the air gap in the direction from the rotor to the stator is denoted as δ. Among them, k1×0.25≤1.25×α×k2×δ / (θ×H)≤t.

[0009] The motor described above in this application may also have the following additional technical features:

[0010] In some embodiments, optionally, the first magnetic tuning slot is located on the magnetic pole center line of the core body, and the length of the first magnetic tuning slot is less than or equal to the length of the second magnetic tuning slot.

[0011] In some embodiments, optionally, the two second magnetic tuning slots in each magnetic tuning slot group are symmetrically arranged with the magnetic pole center line as the symmetry axis.

[0012] In some embodiments, optionally, in each magnetic tuning slot group, the multiple magnetic tuning slots further include: two third magnetic tuning slots, each second magnetic tuning slot is located between the two third magnetic tuning slots, each third magnetic tuning slot includes a third slot end, a fourth slot end and a connecting slot section, the third slot ends of the two third magnetic tuning slots are far away from each other, and the fourth slot ends of the two third magnetic tuning slots are close to each other.

[0013] In some embodiments, optionally, the two third magnetic tuning slots are symmetrically arranged with the magnetic pole center line as the symmetry axis, and the second magnetic tuning slot and the third magnetic tuning slot located on the same side of the magnetic pole center line are arranged in parallel.

[0014] In some embodiments, optionally, the length of the third magnetic tuning slot is smaller than the length of the second magnetic tuning slot.

[0015] In some embodiments, optionally, θ and t satisfy: 0.5° / mm<θ / t<3.6° / mm.

[0016] In some embodiments, optionally, the motor further includes: a plurality of permanent magnets, each magnet slot is provided with a permanent magnet, and the permanent magnets contain X% of cerium by mass, wherein 1%<X%<5%.

[0017] In some embodiments, optionally, the rotor core further comprises: a plurality of rivet portions provided on the core body, and at least one rivet portion is provided between each magnet slot group and the outer peripheral wall of the core body.

[0018] In some embodiments, optionally, the rivet portion is located between the first magnetic tuning groove and the second magnetic tuning groove.

[0019] In some embodiments, optionally, the minimum value t of the circumferential width of the tooth body is greater than or equal to 7 mm and less than or equal to 9 mm.

[0020] In some embodiments, optionally, the distance between the magnetic tuning slot group and the outer peripheral wall of the core body is d1, and the minimum value of d1 is greater than or equal to 0.4 mm; the distance between the magnetic tuning slot group and the magnet slot group is d2, and the minimum value of d2 is greater than or equal to 0.4 mm.

[0021] A second aspect of the present application provides a compressor, comprising: the motor as in the first aspect.

[0022] The compressor provided in the present application includes the motor as in the first aspect, and therefore has all the beneficial effects of the above-mentioned motor, which will not be described one by one here.

[0023] A third aspect of the present application provides a vehicle, comprising: the motor as in the first aspect; or the compressor as in the second aspect.

[0024] The vehicle provided in the present application includes the motor in the first aspect or the compressor in the second aspect, and therefore has all the beneficial effects of the above-mentioned motor or compressor, which will not be stated one by one here.

[0025] 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

[0026] 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:

[0027] FIG1 shows a schematic structural diagram of a motor according to an embodiment of the present application;

[0028] FIG2 shows a schematic structural diagram of a rotor according to an embodiment of the present application;

[0029] FIG3 shows a schematic structural diagram of a rotor core according to an embodiment of the present application;

[0030] FIG4 is a schematic diagram showing a partial structure of a motor according to an embodiment of the present application;

[0031] FIG5 shows a magnetic field line distribution diagram of a motor in the related art when it is working;

[0032] FIG6 shows a diagram of the magnetic field lines distribution when the motor of the present application is working;

[0033] FIG7 shows a comparison diagram of radial electromagnetic forces of various orders in space of motors in the related art and the present application;

[0034] FIG8 shows a comparison diagram of radial electromagnetic forces at various multiple frequencies of motors in the related art and the present application;

[0035] FIG9 shows a comparison diagram of torque ripple of motors in related art and the present application;

[0036] FIG10 shows a graph showing a change curve of radial electromagnetic force of a motor with 16 times frequency in the related art and the present application;

[0037] FIG11 shows a curve diagram of radial electromagnetic force variation of a motor with 32 times the frequency in the related art and the present application;

[0038] FIG12 shows a curve diagram of radial electromagnetic force variation of a motor with 56 times the frequency in the related art and the present application;

[0039] FIG13 shows a curve diagram of radial electromagnetic force variation of a motor with 64 times the frequency according to the related art and the present application;

[0040] FIG14 shows a graph showing a change in the harmonic distortion rate of the motor back EMF in the related art and the present application;

[0041] FIG15 shows a comparison of the proportion of the fifth harmonic of the motor back EMF in the related art and the present application;

[0042] FIG16 shows a comparison diagram of the proportion of the 7th harmonic of the motor back electromotive force in the related art and the present application.

[0043] The corresponding relationship between the reference numerals and component names in FIG5 is as follows:

[0044] 1' motor.

[0045] The corresponding relationship between the reference numerals and component names in Figures 1 to 4 and 6 is as follows:

[0046] 1 Motor, 10 Stator, 100 Stator Core, 110 Stator Teeth, 112 Tooth Body, 114 Tooth Shoe, 116 Stator Yoke, 120 Stator Slot, 122 Stator Slot Notch, 130 Mounting Cavity, 200 Winding, 30 Rotor, 300 Rotor Core, 310 Core Body, 320 Shaft Hole, 330 Magnet Slot Group, 332 Magnet Slot, 333 First Slot End, 334 Second Slot End, 335 Straight Slot Section, 336 First Slot wall, 337 second slot wall, 340 magnetic tuning slot group, 341 magnetic tuning slot, 342 first magnetic tuning slot, 344 second magnetic tuning slot, 346 third slot end, 348 fourth slot end, 350 connecting slot section, 352 third magnetic tuning slot, 354 third slot wall, 356 fourth slot wall, 360 magnetic pole center line, 370 rivet portion, 380 first through hole, 390 second through hole, 400 permanent magnet, 500 magnetic pole portion, 60 air gap. 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 16 , a motor 1 , a compressor, and a vehicle according to some embodiments of the present application are described below.

[0050] As shown in FIG. 1 , FIG. 2 , FIG. 3 and FIG. 4 , a motor 1 according to some embodiments of the present application includes a stator 10 and a rotor 30 .

[0051] The stator 10 includes a stator core 100 .

[0052] The stator core 100 includes a plurality of stator teeth 110 and a stator yoke 116 . The stator teeth 110 are connected to the inner circumferential wall of the stator yoke 116 . The plurality of stator teeth 110 are arranged at intervals around the axis of the stator core 100 . The plurality of stator teeth 110 enclose an installation cavity 130 .

[0053] Two adjacent stator teeth 110 and the stator yoke 116 enclose a stator slot 120 .

[0054] The stator tooth 110 includes a tooth body 112 . The minimum circumferential width of the tooth body 112 is t. The width of the stator slot opening 122 in the circumferential direction of the stator 10 is k1 .

[0055] The rotor 30 is rotatably disposed in the mounting cavity 130 . The rotor 30 includes a rotor core 300 .

[0056] The rotor core 300 includes a core body 310 , a shaft hole 320 , a plurality of magnet slot groups 330 , and a plurality of magnetic tuning slot groups 340 .

[0057] The shaft hole 320 is disposed in the core body 310 .

[0058] A plurality of magnet slot groups 330 are provided on the core body 310 , and the plurality of magnet slot groups 330 are arranged at intervals around the shaft hole 320 .

[0059] Each magnet slot set 330 includes two magnet slots 332 .

[0060] Each magnet slot 332 includes a first slot end 333 close to the shaft hole 320 , a second slot end 334 away from the shaft hole 320 , and a straight slot section 335 .

[0061] The straight slot section 335 is connected between the first slot end 333 and the second slot end 334 .

[0062] The first slot ends 333 of the two magnet slots 332 are adjacent to each other, and the second slot ends 334 of the two magnet slots 332 are far away from each other.

[0063] The included angle between the straight slot sections 335 of the two magnet slots 332 is α.

[0064] The circumferential width of the straight slot section 335 is H.

[0065] A plurality of magnetic tuning slot groups 340 are provided on the core body 310 , and a magnetic tuning slot group 340 is provided between each magnet slot group 330 and the outer peripheral wall of the core body 310 .

[0066] Each magnetic tuning slot group 340 includes a plurality of magnetic tuning slots 341 , and the plurality of magnetic tuning slots 341 include a first magnetic tuning slot 342 and two second magnetic tuning slots 344 .

[0067] The first magnetic tuning slot 342 is located between the two second magnetic tuning slots 344 .

[0068] The first magnetic tuning slot 342 and the second magnetic tuning slot 344 each include a third slot end 346 close to the shaft hole 320 , a fourth slot end 348 away from the shaft hole 320 , and a connecting slot section 350 .

[0069] The connecting slot segment 350 is connected between the third slot end 346 and the fourth slot end 348 .

[0070] The third slot ends 346 of the two second magnetic tuning slots 344 are far away from each other.

[0071] The fourth slot ends 348 of the two second magnetic tuning slots 344 are close to each other.

[0072] The angle between the adjacent slot walls of the connecting slot section 350 of the first magnetic tuning slot 342 and the connecting slot section 350 of the second magnetic tuning slot 344 is θ.

[0073] The width of the magnetic tuning slot 341 in the circumferential direction of the rotor 30 is denoted as k2.

[0074] An air gap 60 is enclosed between the stator 10 and the rotor 30 , and the minimum value of the air gap 60 in the direction from the rotor 30 to the stator 10 is denoted as δ.

[0075] Among them, k1×0.25≤1.25×α×k2×δ / (θ×H)≤t.

[0076] In this embodiment, the motor 1 includes a stator 10 and a rotor 30 .

[0077] The stator 10 includes a stator core 100 . The stator core 100 includes a plurality of stator teeth 110 and a stator yoke 116 . Each stator tooth 110 includes a tooth body 112 . The minimum value of the circumferential width of the tooth body 112 is denoted as t.

[0078] Two adjacent stator teeth 110 and the stator yoke 116 enclose a stator slot 120 , and the width of the stator slot opening 122 in the circumferential direction of the stator 10 is denoted as k1 .

[0079] The rotor 30 includes a rotor core 300, which comprises a core body 310, an axial bore 320, a plurality of magnet slot groups 330, and a plurality of magnetic tuning slot groups 340. The plurality of magnet slot groups 330 are spaced apart around the axial bore 320. Each magnet slot group 330 includes two magnet slots 332. Each magnet slot 332 includes a first slot end 333, a second slot end 334, and a straight slot section 335. The first slot end 333 is closer to the axial bore 320 than the second slot end 334; in other words, the first slot end 333 is located between the axial bore 320 and the second slot end 334. One end of the straight slot section 335 is connected to the first slot end 333, and the other end is connected to the second slot end 334. The first slot ends 333 of the two magnet slots 332 are adjacent to each other, while the second slot ends 334 of the two magnet slots 332 are spaced apart from each other. In other words, the two magnet slots 332 are arranged in a V-shape. The included angle between the straight slot sections 335 of the two magnet slots 332 of each magnet slot group 330 is denoted as α, and the circumferential width of the straight slot section 335 is denoted as H.

[0080] Specifically, as shown in FIG3 , the slot wall of the straight slot section 335 of the first magnet slot 332 facing the straight slot section 335 of the second magnet slot 332 is denoted as the first slot wall 336, and the slot wall of the straight slot section 335 of the second magnet slot 332 facing the straight slot section 335 of the first magnet slot 332 is denoted as the second slot wall 337. The angle between the first slot wall 336 and the second slot wall 337 is α, or in other words, the angle between the plane of the first slot wall 336 and the plane of the second slot wall 337 is denoted as α. The width of the magnetic tuning slot 341 in the circumferential direction of the rotor 30 is denoted as k2.

[0081] Multiple magnetic tuning slot groups 340 are spaced apart around the shaft hole 320. A magnetic tuning slot group 340 is disposed between each magnet slot group 330 and the outer peripheral wall of the core body 310. Each magnetic tuning slot group 340 includes multiple magnetic tuning slots 341. The multiple magnetic tuning slots 341 include a first magnetic tuning slot 342 and two second magnetic tuning slots 344. The first magnetic tuning slot 342 is located between the two second magnetic tuning slots 344. The first magnetic tuning slot 342 includes a third slot end 346, a connecting slot section 350, and a fourth slot end 348. The second magnetic tuning slot 344 includes a third slot end 346, a connecting slot section 350, and a fourth slot end 348. The third slot end 346 is closer to the shaft hole 320 than the fourth slot end 348; in other words, the third slot end 346 is located between the shaft hole 320 and the fourth slot end 348. The third slot ends 346 of the two second magnetic tuning slots 344 are spaced apart from each other, while the fourth slot ends 348 of the two second magnetic tuning slots 344 are close to each other. That is, the two second magnetic tuning slots 344 are arranged in an "eight" shape. The angle between the adjacent slot walls of the connecting slot section 350 of the first magnetic tuning slot 342 and the connecting slot section 350 of the second magnetic tuning slot 344 is θ.

[0082] Specifically, as shown in FIG3 , the slot wall of the connecting slot section 350 of the first magnetic tuning slot 342 facing the connecting slot section 350 of the second magnetic tuning slot 344 is denoted as the third slot wall 354, and the slot wall of the connecting slot section 350 of the second magnetic tuning slot 344 facing the connecting slot section 350 of the first magnetic tuning slot 342 is denoted as the fourth slot wall 356. The angle between the third slot wall 354 and the fourth slot wall 356 is denoted as θ. It will be understood that the angle between the plane where the third slot wall 354 lies and the plane where the fourth slot wall 356 lies is θ.

[0083] An air gap 60 is enclosed between the stator 10 and the rotor 30 , and the minimum value of the air gap 60 in the direction from the rotor 30 to the stator 10 is denoted as δ.

[0084] It's understandable that the vibration noise of motor 1 is correlated with the radial electromagnetic force level and torque ripple. The magnetic field adjustment slot group 340 alters the direction of the magnetic field lines. By defining the relationship between α, θ, H, k1, k2, δ, and t to satisfy the following: k1 × 0.25 ≤ 1.25 × α × k2 × δ / (θ × H) ≤ t, the direction of the magnetic field lines can be adjusted, reducing motor 1's harmonics, magnetic leakage, torque ripple, and radial electromagnetic force, thereby improving vibration noise.

[0085] The radial electromagnetic force of motor 1 is an important indicator of its vibration and noise levels. The magnitude of this radial electromagnetic force varies with space and time. Spatial electromagnetic force is described by order, while temporal electromagnetic force is described by frequency doubling. This application defines the relationship between α, θ, H, k1, k2, δ, and t to reduce the radial electromagnetic force corresponding to different spatial orders and to reduce the radial electromagnetic force corresponding to different temporal frequency doublings. This effectively reduces the vibration and noise of motor 1 during operation, improving its performance and market competitiveness.

[0086] Optionally, the magnetic tuning slot group 340 includes an odd number of magnetic tuning slots.

[0087] Optionally, as shown in FIG. 1 , the stator tooth 110 further includes a tooth shoe 114 . The tooth body 112 extends in the radial direction of the stator core 100 . The tooth shoe 114 is connected to the tooth body 112 . The tooth shoe 114 is located at the end surface of the tooth body 112 facing the rotor 30 .

[0088] In some embodiments, optionally, as shown in FIG. 1 , FIG. 2 and FIG. 3 , the first magnetic tuning slot 342 is located on the magnetic pole center line 360 ​​of the core body 310 .

[0089] The length of the first magnetic tuning slot 342 is less than or equal to the length of the second magnetic tuning slot 344 .

[0090] In this embodiment, the coordination structure of the first and second magnetic tuning slots 342, 344 is further defined, such that the first magnetic tuning slot 342 is located on the magnetic pole centerline 360 ​​of the core body 310. Furthermore, the coordination structure of the first and second magnetic tuning slots 342, 344 is defined such that the length L1 of the first magnetic tuning slot 342 is less than or equal to the length L2 of the second magnetic tuning slot 344. In other words, the length of the first magnetic tuning slot 342 located on the magnetic pole centerline 360 ​​is equal to the length of the second magnetic tuning slot 344 located to one side of the magnetic pole centerline 360. Alternatively, the length of the first magnetic tuning slot 342 located on the magnetic pole centerline 360 ​​is shorter than the length of the second magnetic tuning slot 344 located to one side of the magnetic pole centerline 360. The coordination of the first magnetic tuning slot 342 and the two second magnetic tuning slots 344 adjusts the direction of the magnetic flux of the motor 1, which helps reduce magnetic flux leakage, improve the strength of the rotor 30, and enhance the reliability of the motor 1 during high-speed operation.

[0091] It is understood that on the axial end face of the core body 310, the line connecting the center of the magnet slot group 330 and the center of the shaft hole 320 is the magnetic pole centerline 360, referred to as the "d" axis. The first magnetic tuning slot 342 is located on the magnetic pole centerline 360. The position of the first magnetic tuning slot 342 can be determined based on the center of the shaft hole 320 and the center of the magnet slot group 330, providing effective and reliable structural support for ensuring the controllable direction of the magnetic lines of force.

[0092] Optionally, the center of the first magnetic tuning slot 342 may be located on one side of the magnetic pole center line 360 ​​, or the center of the first magnetic tuning slot 342 may be deflected by a preset angle relative to the magnetic pole center line 360 ​​.

[0093] Optionally, there are multiple magnetic tuning slot groups 340 and multiple magnetic pole center lines 360 , and the number of magnetic tuning slot groups 340 corresponds to the number of magnetic pole center lines 360 , that is, the first magnetic tuning slot 342 in each magnetic tuning slot group 340 corresponds to one magnetic pole center line 360 ​​.

[0094] In some embodiments, optionally, the two second magnetic tuning slots 344 of each magnetic tuning slot group 340 are symmetrically arranged with the magnetic pole center line 360 ​​as the symmetry axis.

[0095] In this embodiment, the coordination structure between the two second magnetic tuning slots 344 of each magnetic tuning slot group 340 and the magnetic pole centerline 360 ​​is further defined. The two second magnetic tuning slots 344 of each magnetic tuning slot group 340 are symmetrically arranged with the magnetic pole centerline 360 ​​as the axis of symmetry. That is, the magnetic pole centerline 360 ​​is located between the two second magnetic tuning slots 344, and the two second magnetic tuning slots 344 are symmetrically arranged with the magnetic pole centerline 360 ​​as the axis of symmetry.

[0096] By setting two symmetrically arranged second magnetic adjustment slots 344 to adjust the distribution of magnetic lines of force, the symmetry and sinusoidality of the magnetic field arrangement of the motor 1 are improved, which is beneficial to reducing leakage flux, thereby reducing torque pulsation during the operation of the motor 1 and improving vibration noise during the operation of the motor 1.

[0097] At the same time, this arrangement ensures the dynamic balance of the rotor 30 during rotation, reduces the vibration of the compressor's shaft structure, and effectively improves the content of various harmonics of the air gap magnetic flux density of the motor 1. This, on the one hand, reduces the iron loss of the stator 10 of the motor 1, which is conducive to improving the operating efficiency of the motor 1, and on the other hand, improves the vibration noise of the motor 1, thereby reducing the operating noise of the compressor.

[0098] In some embodiments, optionally, as shown in FIG. 1 and FIG. 2 , in each magnetic tuning slot group 340 , the plurality of magnetic tuning slots 341 further include two third magnetic tuning slots 352 .

[0099] Each second magnetic tuning slot 344 is located between two third magnetic tuning slots 352 .

[0100] Each third magnetic tuning slot 352 includes a third slot end 346 , a fourth slot end 348 , and a connecting slot segment 350 .

[0101] The third slot ends 346 of the two third magnetic tuning slots 352 are far away from each other.

[0102] The fourth slot ends 348 of the two third magnetic tuning slots 352 are close to each other.

[0103] In this embodiment, the structure of the magnetic tuning slot group 340 is further defined, such that the plurality of magnetic tuning slots 341 in the magnetic tuning slot group 340 further includes two third magnetic tuning slots 352. Each second magnetic tuning slot 344 is located between two third magnetic tuning slots 352. That is, the first magnetic tuning slot 342 and any of the two second magnetic tuning slots 344 are located between two third magnetic tuning slots 352. Each third magnetic tuning slot 352 includes a third slot end 346, a fourth slot end 348, and a connecting slot section 350. The third slot end 346 is closer to the shaft hole 320 than the fourth slot end 348. In other words, the third slot end 346 is located between the shaft hole 320 and the fourth slot end 348. The third slot ends 346 of the two third magnetic tuning slots 352 are spaced apart from each other, while the fourth slot ends 348 of the two third magnetic tuning slots 352 are close to each other. That is, the two third magnetic tuning slots 352 are arranged in an "eight" shape.

[0104] That is to say, along the circumference of the rotor 30, the first magnetic tuning slot 342 has a first side and a second side, a second magnetic tuning slot 344 and a third magnetic tuning slot 352 are located on the first side of the first magnetic tuning slot 342, and another second magnetic tuning slot 344 and another third magnetic tuning slot 352 are located on the second side of the first magnetic tuning slot 342.

[0105] This setting can adjust the direction of the magnetic lines of force, reduce the harmonics of the motor 1, reduce leakage flux, weaken torque pulsation and radial electromagnetic force, and thus improve vibration noise.

[0106] It is understood that the width of the first magnetic tuning slot 342 in the circumferential direction of the rotor is recorded as k2, the width of the second magnetic tuning slot 344 in the circumferential direction of the rotor is recorded as k2, and the width of the third magnetic tuning slot 352 in the circumferential direction of the rotor is recorded as k2. Optionally, the widths of any two of the first magnetic tuning slot 342, the second magnetic tuning slot 344, and the third magnetic tuning slot 352 in the circumferential direction of the rotor are equal.

[0107] In some embodiments, optionally, the two third magnetic tuning slots 352 are symmetrically arranged with the magnetic pole center line 360 ​​as the symmetry axis.

[0108] The second magnetic tuning slot 344 and the third magnetic tuning slot 352 are arranged in parallel on the same side of the magnetic pole center line 360 ​​.

[0109] In this embodiment, the matching structure of the second magnetic tuning slot 344 and the third magnetic tuning slot 352 is further defined, so that the two third magnetic tuning slots 352 are symmetrically arranged with the magnetic pole center line 360 ​​as the symmetry axis, that is, the magnetic pole center line 360 ​​is located between the two third magnetic tuning slots 352, and the two third magnetic tuning slots 352 are symmetrically arranged with the magnetic pole center line 360 ​​as the symmetry axis.

[0110] Furthermore, the second magnetic tuning slot 344 and the third magnetic tuning slot 352, located on the same side of the magnetic pole centerline 360, are arranged in parallel. Specifically, one second magnetic tuning slot 344 and one third magnetic tuning slot 352 are located on a first side of the magnetic pole centerline 360, and the second magnetic tuning slot 344 and the third magnetic tuning slot 352 are arranged in parallel. Another second magnetic tuning slot 344 and another third magnetic tuning slot 352 are located on a second side of the magnetic pole centerline 360, and the second magnetic tuning slot 344 and the third magnetic tuning slot 352 are arranged in parallel.

[0111] By providing two symmetrically arranged second magnetic tuning slots 344 and two symmetrically arranged third magnetic tuning slots 352, the distribution of magnetic lines of force can be adjusted to improve the symmetry and sinusoidality of the magnetic field arrangement of the motor 1, which is beneficial to reducing magnetic leakage, thereby reducing torque pulsation during the operation of the motor 1 and improving vibration noise during the operation of the motor 1.

[0112] In some other embodiments, each magnetic tuning slot group 340 further includes two fourth magnetic tuning slots, which are symmetrically arranged about the magnetic pole centerline 360 ​​and located on the same side of the magnetic pole centerline 360, between the second magnetic tuning slot 344, the third magnetic tuning slot 352, and the fourth magnetic tuning slot. The third magnetic tuning slot 352 is located between the second magnetic tuning slot 344 and the fourth magnetic tuning slot. Similarly, each magnetic tuning slot group 340 includes an odd number of magnetic tuning slots. Along the circumference of the rotor 30, the first magnetic tuning slot 342 has a first side and a second side. The number of magnetic tuning slots located on the first side of the first magnetic tuning slot 342 is equal to the number of magnetic tuning slots located on the second side of the first magnetic tuning slot 342. Any two of the multiple magnetic tuning slots located on the same side of the first magnetic tuning slot 342 are arranged in parallel.

[0113] In some embodiments, optionally, as shown in FIG. 3 , the length of the third magnetic tuning slot 352 is smaller than the length of the second magnetic tuning slot 344 .

[0114] In this embodiment, the matching structure of the second magnetic tuning slot 344 and the third magnetic tuning slot 352 is further defined, such that the length L3 of the third magnetic tuning slot 352 is less than the length L2 of the second magnetic tuning slot 344. The first magnetic tuning slot 342 is located on the magnetic pole centerline 360. Therefore, the distance between the magnet slot group 330 and the outer peripheral wall of the core body 310 gradually decreases from the first magnetic tuning slot 342 to the third magnetic tuning slot 352, making the length of the third magnetic tuning slot 352 less than the length of the second magnetic tuning slot 344. This ensures that there is a distance between the third magnetic tuning slot 352 and the magnet slot group 330, and also between the third magnetic tuning slot 352 and the outer peripheral wall of the core body 310. This ensures the structural strength of the rotor core 300 while also meeting the requirements for adjusting the direction of magnetic lines of force.

[0115] In some embodiments, optionally, θ and t satisfy: 0.5° / mm<θ / t<3.6° / mm.

[0116] In this embodiment, the relationship between the angle θ between the adjacent slot walls of the connecting slot segment 350 of the first magnetic tuning slot 342 and the connecting slot segment 350 of the second magnetic tuning slot 344 and the minimum circumferential width t of the tooth body 112 is further defined. This configuration can weaken the back EMF harmonics of the motor 1, reduce the back EMF distortion rate of the motor 1, and help reduce the torque ripple of the motor 1, thereby reducing the vibration and noise of the motor 1, and improving the performance and market competitiveness of the compressor or vehicle using the motor 1.

[0117] It will be appreciated that the unit of θ is degree and the unit of t is millimeter.

[0118] Optionally, θ / t=1° / mm, θ / t=1.5° / mm, θ / t=2° / mm, θ / t=2.5° / mm, θ / t=3° / mm and θ / t=3.5° / mm, etc., which are not listed here one by one.

[0119] In some embodiments, optionally, as shown in FIG. 1 and FIG. 2 , the motor 1 further includes a plurality of permanent magnets 400 .

[0120] A permanent magnet 400 is disposed in each magnet slot 332 .

[0121] The permanent magnet 400 contains X% by mass of cerium, where 1%<X%<5%.

[0122] In this embodiment, the structure of the motor 1 is further defined, such that the motor 1 further includes a plurality of permanent magnets 400, with one permanent magnet 400 disposed in each magnet slot 332. The permanent magnets 400 contain X% by mass of cerium. Using the cerium-containing permanent magnets 400 as magnetic poles can reduce the content of praseodymium and neodymium elements in the permanent magnets 400. This reduces the production cost of the permanent magnets 400, and thus reduces the production cost of the motor 1, thereby resolving the problem in related arts of high motor costs due to the high prices of rare earth materials such as praseodymium and neodymium.

[0123] By replacing the relatively expensive praseodymium and neodymium elements in the permanent magnet 400 with the abundant and relatively cheap cerium element, the price of the permanent magnet 400 can be effectively reduced and the cost performance of the motor 1 can be improved.

[0124] In addition, the mass proportion of cerium element in the permanent magnet 400 is greater than 1% and less than 5%. Adding cerium element to the permanent magnet 400 can reduce the cost of the permanent magnet 400, thereby reducing the cost of the motor 1. However, the addition of cerium element will reduce the intrinsic coercive force of the permanent magnet 400 and thus weaken the anti-demagnetization ability of the motor 1. When the mass proportion of cerium element is greater than 1% and less than 5%, it can meet the anti-demagnetization ability requirements of the motor 1 while improving the cost performance of the motor 1.

[0125] Optionally, X%=1.5%, X%=2%, X%=2.5%, X%=3%, X%=3.5%, X%=4% and X%=4.5%, etc., which are not listed here one by one.

[0126] In some embodiments, optionally, as shown in FIG. 1 and FIG. 2 , the rotor core 300 further includes a plurality of rivet portions 370 .

[0127] A plurality of rivet portions 370 are provided on the core body 310 , and at least one rivet portion 370 is provided between each magnet slot group 330 and the outer peripheral wall of the core body 310 .

[0128] In this embodiment, the structure of the rotor core 300 is further defined such that the rotor core 300 further includes a plurality of rivet portions 370 .

[0129] It is understood that the rotor core 300 includes multiple rotor 30 stampings, which are stacked. Along the axial direction of the rotor core 300, the shaft hole 320 penetrates the multiple rotor 30 stampings, each magnet slot group 330 penetrates the multiple rotor 30 stampings, and each magnetic tuning slot group 340 penetrates the multiple rotor 30 stampings. Each rotor 30 stamping is provided with multiple rivet portions 370.

[0130] Multiple rotor 30 punchings are stacked along the axial direction of the rotor core 300 to form the rotor core 300 , and the rivet buckles 370 on two adjacent rotor 30 punchings can cooperate to connect the multiple rotor 30 punchings to each other in the axial direction, thereby forming the rotor core 300 .

[0131] It can be understood that at least one rivet portion 370 is provided between each magnet slot group 330 and the outer peripheral wall of the core body 310, that is, multiple rivet portions 370 are arranged at intervals around the shaft hole 320. This arrangement can ensure the balance and consistency of the force applied to the rotor 30 punching sheets at different positions. In this way, the overall external dimensions of the rotor core 300 can be guaranteed, and the safety and reliability of product use can be improved.

[0132] In some other embodiments, a portion of the core body 310 between the shaft hole 320 and the magnet slot group 330 is further provided with a plurality of rivet portions 370 .

[0133] In some embodiments, optionally, as shown in FIG. 1 and FIG. 2 , the rivet portion 370 is located between the first magnetic tuning slot 342 and the second magnetic tuning slot 344 .

[0134] In this embodiment, the mating structure of the rivet portion 370, the first magnetic tuning slot 344, and the second magnetic tuning slot 344 is further defined, such that the rivet portion 370 is located between the first magnetic tuning slot 342 and the second magnetic tuning slot 344. That is, the rivet portion 370 is located on one side of the magnetic pole centerline 360 ​​and is adjacent to the first magnetic tuning slot 342. If the rivet portion 370 is too close to the magnet slot group 330, for example, if it is located between the magnet slot group 330 and the magnetic tuning slot group 340, the magnet slot group 330 may be deformed during the high-speed stamping process of the rotor core 300 mold, resulting in changes in the size of the magnet slot group 330 and a mismatch between the size of the magnet slot 332 and the size of the permanent magnet 400. This may affect the assembly process of the permanent magnet 400 to the magnet slot group 330. That is to say, the position setting of the rivet portion 370 of the present application can ensure the riveting reliability of the rotor core 300 while also improving manufacturability, thereby ensuring the production efficiency and yield rate of the product.

[0135] In some other embodiments, rivet portions 370 are provided between a portion of the multiple magnet slot groups 330 and the outer peripheral wall of the core body 310, while no rivet portions 370 are provided between another portion of the magnet slot groups 330 and the outer peripheral wall of the core body 310.

[0136] In some other embodiments, the portion of the core body 310 located between the shaft hole 320 and the magnet slot group 330 is further provided with a rivet portion 370. This arrangement can increase the riveting area of ​​two adjacent rotor 30 punchings, so that multiple rotor 30 punchings can be effectively assembled into a whole, avoiding the occurrence of local warping of the rotor 30 punchings, and ensuring the overall external dimensions of the rotor core 300.

[0137] In some embodiments, optionally, as shown in FIG1 , the minimum value t of the circumferential width of the tooth body 112 is greater than or equal to 7 mm and less than or equal to 9 mm.

[0138] In this embodiment, the structure of stator teeth 110 is further defined such that the minimum circumferential width t of the tooth body 112 of stator tooth 110 is greater than or equal to 7 mm and less than or equal to 9 mm, that is, 7 mm ≤ t ≤ 9 mm. This configuration ensures the rigidity of stator core 100 while ensuring the safety, reliability, efficiency, and load capacity of motor 1.

[0139] Optionally, t=7.5mm, t=8mm and t=8.5mm, etc., are not listed here one by one.

[0140] If the minimum circumferential width t of the tooth body 112 is less than 7 mm, the circumferential width of the tooth body 112 of the stator core 100 is too small, and the magnetic field at the stator teeth 110 is easily saturated, causing severe heating of the motor 1 under heavy load. Furthermore, a too small circumferential width of the tooth body 112 of the stator core 100 can reduce the rigidity of the stator core 100, which can exacerbate the vibration and noise of the motor 1.

[0141] If the minimum value t of the circumferential width of the tooth body 112 is greater than 9 mm, the circumferential width of the tooth body 112 of the stator core 100 is too large, which will reduce the area of ​​the stator slot 120 of the stator core 100 and further reduce the efficiency and load capacity of the motor 1.

[0142] In some embodiments, optionally, as shown in FIG3 , the distance between the magnetic tuning slot group 340 and the outer peripheral wall of the core body 310 is d1.

[0143] The minimum value of d1 is greater than or equal to 0.4 mm.

[0144] The distance between the magnetic tuning slot group 340 and the magnet slot group 330 is d2.

[0145] The minimum value of d2 is greater than or equal to 0.4 mm.

[0146] In this embodiment, the mating structure of the magnetic tuning slot group 340 and the core body 310 is further defined, such that the distance between the magnetic tuning slot group 340 and the outer peripheral wall of the core body 310 is denoted as d1, where the minimum value of d1 is greater than or equal to 0.4 mm. This configuration ensures the manufacturability of the rotor core 300, ensuring that the strength of the rotor 30 is within a safe range, preventing deformation during high-speed rotation of the motor 1. This avoids excessive deformation of the rotor 300, thereby preventing the uneven magnetic field distribution in the motor 1 and causing high vibration and noise, and further improves the structural strength of the rotor 30.

[0147] Optionally, the minimum value of d1 includes 0.5 mm, 0.6 mm, 0.7 mm, 0.9 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, etc., which are not listed here one by one.

[0148] Furthermore, the matching structure of the magnetic tuning slot group 340 and the magnet slot group 330 is further defined, such that the distance between the magnetic tuning slot group 340 and the magnet slot group 330 is denoted as d2, where the minimum value of d2 is greater than or equal to 0.4 mm. This configuration ensures the manufacturability of the rotor core 300, keeps the strength of the rotor 30 within a safe range, and prevents deformation during high-speed rotation of the motor 1. This avoids excessive deformation of the rotor 30, which can lead to uneven magnetic field distribution in the motor 1 and cause high vibration and noise, and also helps improve the structural strength of the rotor 30.

[0149] Optionally, the minimum value of d2 includes 0.5mm, 0.6mm, 0.7mm, 0.9mm, 1mm, 1.2mm, 1.4mm, 1.6mm, etc., which are not listed here one by one.

[0150] According to some further embodiments of the present application, a compressor includes: a motor 1 as described in any of the above embodiments.

[0151] In this embodiment, the compressor includes a motor 1 .

[0152] The motor 1 includes a stator 10 and a rotor 30 .

[0153] The stator 10 includes a stator core 100 . The stator core 100 includes a plurality of stator teeth 110 . Each stator tooth 110 includes a tooth body 112 . The minimum value of the circumferential width of the tooth body 112 is denoted as t.

[0154] The rotor 30 includes a rotor core 300, which comprises a core body 310, an axial bore 320, a plurality of magnet slot groups 330, and a plurality of magnetic tuning slot groups 340. The plurality of magnet slot groups 330 are spaced apart around the axial bore 320. Each magnet slot group 330 includes two magnet slots 332. Each magnet slot 332 includes a first slot end 333, a second slot end 334, and a straight slot section 335. The first slot end 333 is closer to the axial bore 320 than the second slot end 334; in other words, the first slot end 333 is located between the axial bore 320 and the second slot end 334. One end of the straight slot section 335 is connected to the first slot end 333, and the other end is connected to the second slot end 334. The first slot ends 333 of the two magnet slots 332 are adjacent to each other, while the second slot ends 334 of the two magnet slots 332 are spaced apart from each other. In other words, the two magnet slots 332 are arranged in a V-shape. The included angle between the straight slot sections 335 of the two magnet slots 332 of each magnet slot group 330 is denoted as α, and the circumferential width of the straight slot section 335 is denoted as H.

[0155] Specifically, as shown in Figure 3, the slot wall of the straight slot section 335 of the first magnet slot 332 facing the straight slot section 335 of the second magnet slot 332 is recorded as the first slot wall 336, and the slot wall of the straight slot section 335 of the second magnet slot 332 facing the straight slot section 335 of the first magnet slot 332 is recorded as the second slot wall 337. The angle between the first slot wall 336 and the second slot wall 337 is α, or in other words, the angle between the plane where the first slot wall 336 is located and the plane where the second slot wall 337 is located is recorded as α.

[0156] Multiple magnetic tuning slot groups 340 are spaced apart around the shaft hole 320. A magnetic tuning slot group 340 is disposed between each magnet slot group 330 and the outer peripheral wall of the core body 310. Each magnetic tuning slot group 340 includes a first magnetic tuning slot 342 and two second magnetic tuning slots 344. The first magnetic tuning slot 342 is located between the two second magnetic tuning slots 344. The first magnetic tuning slot 342 includes a third slot end 346, a connecting slot section 350, and a fourth slot end 348. The second magnetic tuning slot 344 includes a third slot end 346, a connecting slot section 350, and a fourth slot end 348. The third slot end 346 is closer to the shaft hole 320 than the fourth slot end 348; in other words, the third slot end 346 is located between the shaft hole 320 and the fourth slot end 348. The third slot ends 346 of the two second magnetic tuning slots 344 are spaced apart from each other, while the fourth slot ends 348 of the two second magnetic tuning slots 344 are close to each other. That is, the two second magnetic tuning slots 344 are arranged in an "eight" shape. The angle between the adjacent slot walls of the connecting slot section 350 of the first magnetic tuning slot 342 and the connecting slot section 350 of the second magnetic tuning slot 344 is θ.

[0157] Specifically, as shown in FIG3 , the slot wall of the connecting slot section 350 of the first magnetic tuning slot 342 facing the connecting slot section 350 of the second magnetic tuning slot 344 is denoted as the third slot wall 354, and the slot wall of the connecting slot section 350 of the second magnetic tuning slot 344 facing the connecting slot section 350 of the first magnetic tuning slot 342 is denoted as the fourth slot wall 356. The angle between the third slot wall 354 and the fourth slot wall 356 is denoted as θ. It will be understood that the angle between the plane where the third slot wall 354 lies and the plane where the fourth slot wall 356 lies is θ.

[0158] It's understandable that the vibration noise of motor 1 is correlated with the radial electromagnetic force level and torque ripple. The magnetic field adjustment slot group 340 alters the direction of the magnetic field lines. By limiting the relationship between α, θ, H, and t to satisfy the following equation: k1×0.25≤1.25×α×k2×δ / (θ×H)≤t, the direction of the magnetic field lines can be adjusted, reducing motor 1's harmonics, magnetic leakage, torque ripple, and radial electromagnetic force, thereby improving vibration noise.

[0159] The radial electromagnetic force of motor 1 is an important indicator of its vibration and noise levels. The magnitude of this radial electromagnetic force varies with space and time. Spatial electromagnetic force is described by order, while temporal electromagnetic force is described by frequency doubling. By defining the relationship between α, θ, H, and t, this approach reduces radial electromagnetic forces corresponding to different spatial orders and also reduces radial electromagnetic forces corresponding to different temporal frequency doublings. This effectively reduces the vibration and noise of motor 1 during operation, improving its performance and market competitiveness.

[0160] According to some further embodiments of the present application, a vehicle includes: a motor 1 as in any of the above embodiments; or a compressor as in the above embodiments.

[0161] In this embodiment, the vehicle includes a motor 1 or a compressor. The compressor includes a motor 1.

[0162] The motor 1 includes a stator 10 and a rotor 30 .

[0163] The stator 10 includes a stator core 100 . The stator core 100 includes a plurality of stator teeth 110 . Each stator tooth 110 includes a tooth body 112 . The minimum value of the circumferential width of the tooth body 112 is denoted as t.

[0164] The rotor 30 includes a rotor core 300, which comprises a core body 310, an axial bore 320, a plurality of magnet slot groups 330, and a plurality of magnetic tuning slot groups 340. The plurality of magnet slot groups 330 are spaced apart around the axial bore 320. Each magnet slot group 330 includes two magnet slots 332. Each magnet slot 332 includes a first slot end 333, a second slot end 334, and a straight slot section 335. The first slot end 333 is closer to the axial bore 320 than the second slot end 334; in other words, the first slot end 333 is located between the axial bore 320 and the second slot end 334. One end of the straight slot section 335 is connected to the first slot end 333, and the other end is connected to the second slot end 334. The first slot ends 333 of the two magnet slots 332 are adjacent to each other, while the second slot ends 334 of the two magnet slots 332 are spaced apart from each other. In other words, the two magnet slots 332 are arranged in a V-shape. The included angle between the straight slot sections 335 of the two magnet slots 332 of each magnet slot group 330 is denoted as α, and the circumferential width of the straight slot section 335 is denoted as H.

[0165] Specifically, as shown in Figure 3, the slot wall of the straight slot section 335 of the first magnet slot 332 facing the straight slot section 335 of the second magnet slot 332 is recorded as the first slot wall 336, and the slot wall of the straight slot section 335 of the second magnet slot 332 facing the straight slot section 335 of the first magnet slot 332 is recorded as the second slot wall 337. The angle between the first slot wall 336 and the second slot wall 337 is α, or in other words, the angle between the plane where the first slot wall 336 is located and the plane where the second slot wall 337 is located is recorded as α.

[0166] Multiple magnetic tuning slot groups 340 are spaced apart around the shaft hole 320. A magnetic tuning slot group 340 is disposed between each magnet slot group 330 and the outer peripheral wall of the core body 310. Each magnetic tuning slot group 340 includes a first magnetic tuning slot 342 and two second magnetic tuning slots 344. The first magnetic tuning slot 342 is located between the two second magnetic tuning slots 344. The first magnetic tuning slot 342 includes a third slot end 346, a connecting slot section 350, and a fourth slot end 348. The second magnetic tuning slot 344 includes a third slot end 346, a connecting slot section 350, and a fourth slot end 348. The third slot end 346 is closer to the shaft hole 320 than the fourth slot end 348; in other words, the third slot end 346 is located between the shaft hole 320 and the fourth slot end 348. The third slot ends 346 of the two second magnetic tuning slots 344 are spaced apart from each other, while the fourth slot ends 348 of the two second magnetic tuning slots 344 are close to each other. That is, the two second magnetic tuning slots 344 are arranged in an "eight" shape. The angle between the adjacent slot walls of the connecting slot section 350 of the first magnetic tuning slot 342 and the connecting slot section 350 of the second magnetic tuning slot 344 is θ.

[0167] Specifically, as shown in FIG3 , the slot wall of the connecting slot section 350 of the first magnetic tuning slot 342 facing the connecting slot section 350 of the second magnetic tuning slot 344 is denoted as the third slot wall 354, and the slot wall of the connecting slot section 350 of the second magnetic tuning slot 344 facing the connecting slot section 350 of the first magnetic tuning slot 342 is denoted as the fourth slot wall 356. The angle between the third slot wall 354 and the fourth slot wall 356 is denoted as θ. It will be understood that the angle between the plane where the third slot wall 354 lies and the plane where the fourth slot wall 356 lies is θ.

[0168] It's understandable that the vibration noise of motor 1 is correlated with the radial electromagnetic force level and torque ripple. The magnetic field adjustment slot group 340 alters the direction of the magnetic field lines. By limiting the relationship between α, θ, H, and t to satisfy the following equation: k1×0.25≤1.25×α×k2×δ / (θ×H)≤t, the direction of the magnetic field lines can be adjusted, reducing motor 1's harmonics, magnetic leakage, torque ripple, and radial electromagnetic force, thereby improving vibration noise.

[0169] The radial electromagnetic force of motor 1 is an important indicator of its vibration and noise levels. The magnitude of this radial electromagnetic force varies with space and time. Spatial electromagnetic force is described by order, while temporal electromagnetic force is described by frequency doubling. By defining the relationship between α, θ, H, and t, this approach reduces radial electromagnetic forces corresponding to different spatial orders and also reduces radial electromagnetic forces corresponding to different temporal frequency doublings. This effectively reduces the vibration and noise of motor 1 during operation, improving its performance and market competitiveness.

[0170] Optionally, the compressor comprises an electric compressor.

[0171] 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.

[0172] Optionally, as shown in FIG2 , the rotor core 300 is provided with a first through-hole 380 and a second through-hole 390 . At least one of the first through-hole 380 and the second through-hole 390 can serve as a weight-reducing hole. At least one of the first through-hole 380 and the second through-hole 390 can serve as a flow-through hole. The through-holes extend through the rotor core 300 .

[0173] Optionally, as shown in FIG. 1 , the stator core 100 is provided with stator slots 120 .

[0174] Optionally, as shown in Figures 1 and 2, the motor 1 includes a permanent magnet motor 1. The permanent magnet motor 1 includes a stator 10 and a rotor 30. The stator 10 includes a stator core 100 and windings 200 (i.e., enameled wire). The rotor 30 includes a rotor core 300 and multiple permanent magnets 400. The rotor core 300 includes a core body 310, multiple magnet slot groups 330, multiple magnetic tuning slot groups 340, a rotating shaft, a first through-hole 380, and a second through-hole 390. Enameled wire is placed in the stator slots 120 and wound around the stator teeth 110 of the stator core 100. The multiple magnet slot groups 330 are evenly distributed along the circumference of the shaft hole 320, with each magnet slot group 330 including two magnet slots 332. Each permanent magnet 400 is placed in one magnet slot 332. The permanent magnets 400 contain cerium. A magnetic pole portion 500 is formed between the outer edge of the core body 310 and the magnet slot group 330. The magnetic pole portion 500 is provided with a magnetizing slot group 340, which includes five magnetizing slots. k1×0.25≤1.25×α×k2×δ / (θ×H)≤t, where the angle between the straight slot segments 335 of two magnet slots 332 is α, the angle between the adjacent slot walls of the connecting slot segment 350 of the first magnetizing slot 342 and the connecting slot segment 350 of the second magnetizing slot 344 is θ, the circumferential width of the straight slot segment 335 is H, and the minimum circumferential width of the tooth body 112 is t.

[0175] The first magnetic tuning slot 342 is located on the magnetic pole centerline 360. The length of the first magnetic tuning slot 342 is no greater than the length of the adjacent second magnetic tuning slot 344. This arrangement can adjust the direction of the magnetic flux of the motor 1, reduce magnetic leakage, and increase the strength of the rotor 30, thereby improving the reliability of the motor 1 during high-speed operation.

[0176] The second and third magnetic tuning slots 344, 352, located on the same side of the first magnetic tuning slot 342, are parallel to each other. The two second magnetic tuning slots 344 are symmetrically arranged about the magnetic pole centerline 360, and the two third magnetic tuning slots 352 are symmetrically arranged about the magnetic pole centerline 360. The symmetrical arrangement of the magnetic tuning slots can adjust the distribution of magnetic field lines, improve the symmetry and sinusoidality of the magnetic field of the motor 1, and reduce magnetic leakage.

[0177] θ and t satisfy the following relationship: 0.5° / mm < θ / t < 3.6° / mm. This setting can weaken the back EMF harmonics of motor 1 and reduce the back EMF distortion rate of motor 1, which is beneficial for reducing the torque ripple of motor 1 and thus reducing the vibration noise of motor 1.

[0178] The mass fraction of cerium in permanent magnet 400 is greater than 1% and less than 5%. Adding cerium to permanent magnet 400 can reduce the use of relatively expensive rare earth materials, thereby lowering the cost of motor 1. However, the addition of cerium reduces the intrinsic coercivity of permanent magnet 400, thereby weakening the demagnetization resistance of motor 1. When the mass fraction of cerium is greater than 1% and less than 5%, the motor 1 can meet the demagnetization resistance requirements while improving its cost-effectiveness.

[0179] The magnetic pole portion 500 of the rotor core 300 is provided with a rivet portion 370. The rivet portion 370 is arranged on one side of the magnetic pole centerline 360 ​​and is adjacent to the first magnetic adjustment slot 342. If the rivet portion 370 is too close to the magnet slot group 330, for example, if the rivet portion 370 is arranged below the first magnetic adjustment slot 342, the magnet slot group 330 may be deformed during the high-pressure punching process of the rotor core 300 mold, thereby affecting the smooth assembly of the permanent magnet 400 to the magnet slot group 330. The positioning of the rivet portion 370 of the present application can improve manufacturability while ensuring the reliability of the riveting of the rotor core 300.

[0180] The minimum circumferential width t of the tooth body 112 of the stator tooth 110 satisfies the following condition: 7 mm ≤ t ≤ 9 mm. If the circumferential width of the tooth body 112 is too small, the magnetic field at the stator tooth 110 will easily saturate, causing severe heat generation when the motor 1 is heavily loaded. Furthermore, a too small circumferential width of the tooth body 112 can reduce the stiffness of the stator core 100 and exacerbate the vibration and noise of the motor 1. If the circumferential width of the tooth body 112 is too large, the area of ​​the stator slot 120 will be correspondingly reduced, reducing the efficiency and load capacity of the motor 1.

[0181] The minimum distance between the magnetic adjustment slot group 340 and the outer edge of the core body 310 is not less than 0.4 mm. The minimum distance between the magnetic adjustment slot group 340 and the magnet slot group 330 is not less than 0.4 mm.

[0182] This application can reduce the vibration noise of the motor 1 and meet the use requirements of the motor 1 for high-speed and reliable operation.

[0183] This application is described by taking a 12-slot 8-pole motor 1 as an example.

[0184] As shown in Figure 5, the rotor core in the related art is not equipped with a magnetic tuning slot group. Furthermore, the coordination structure of the magnetic tuning slot group, magnet slot group, shaft hole, core body, and stator is not specified. As shown in Figures 5 and 6, the direction of the magnetic lines of force at the magnetic tuning slot group 340 of the motor 1 of the present application is changed, which reduces the harmonics of the motor 1, weakens torque pulsation and radial electromagnetic force, and thus improves vibration and noise.

[0185] The radial electromagnetic force of motor 1 is an important indicator of the vibration and noise level of motor 1. The magnitude of the radial electromagnetic force varies with space and time. In this application, the spatial electromagnetic force is described by order, and the temporal electromagnetic force is described by frequency doubling. As shown in Figure 7, the spatial order of the radial electromagnetic force of motor 1 of this application is significantly lower than that of motor 1' in the related art. Since the smaller the spatial order of the radial electromagnetic force, the greater the impact on vibration and noise, the main focus is on the values ​​of the 4th and 8th order radial electromagnetic forces. As can be seen from Figure 7, according to the solution of this application, compared with motor 1' in the related art, the 4th and 8th order spatial radial electromagnetic forces are reduced by 24.4% and 14.2%, respectively, which is conducive to improving the vibration and noise of motor 1.

[0186] As shown in Figure 8, compared with the solutions in the related art, the 16-fold, 32-fold, 56-fold and 64-fold radial electromagnetic forces of the motor 1 proposed in this application are reduced by 58.4%, 25.4%, 89.5% and 10.7% respectively, and the high-frequency electromagnetic force level is significantly suppressed, thereby reducing the high-frequency vibration noise of the motor 1.

[0187] As shown in FIG9 , compared with the motor 1 ′ in the related art, the motor 1 of the present application has a torque pulsation peak value reduced by 15.0% under the same load conditions, wherein the 24-fold frequency torque component is reduced by 16.9%, which can significantly reduce the vibration noise of the motor 1 .

[0188] As shown in Figures 10, 11, 12 and 13, when k1×0.25≤1.25×α×k2×δ / (θ×H)≤t, the radial electromagnetic force of the present application is smaller than the radial electromagnetic force in the related art and is at a lower level, which can reduce the vibration noise of the motor 1.

[0189] Optionally, when 1≤1.25×α×k2×δ / (θ×H)≤9, the radial electromagnetic force of the present application is smaller than the radial electromagnetic force in the related art and is at a lower level, which can reduce the vibration noise of the motor 1.

[0190] As shown in FIG14 , 0.5° / mm<θ / t<3.6° / mm. Specifically, taking H=1.8mm as an example, the back EMF distortion rate of motor 1 is lower than that of motor 1 ′ in the related art and is at a relatively low level. The back EMF sinusoidality is better, which is conducive to improving vibration noise.

[0191] Optionally, the ratio of θ / t is correlated with H, for example, the ratio of θ / t is correlated with a value of 1.6×H.

[0192] As shown in FIG15 and FIG16 , the 5th and 7th harmonics of the back electromotive force of the motor 1 of the present application are significantly reduced, which is beneficial to reducing torque pulsation and reducing vibration noise of the motor 1 .

[0193] In other words, the present application can weaken the radial electromagnetic force and torque pulsation of the motor 1 and significantly reduce the vibration noise of the motor 1.

[0194] 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.

[0195] 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 motor, wherein: include: A stator, the stator comprising a stator core, the stator core comprising a plurality of stator teeth and a stator yoke, the stator teeth being connected to the inner circumferential wall of the stator yoke, the plurality of stator teeth being spaced apart around the axis of the stator core, the plurality of stator teeth enclosing a mounting cavity, two adjacent stator teeth and the stator yoke enclosing a stator slot, the stator tooth comprising a tooth body, the minimum circumferential width of the tooth body being t, and the width of the stator slot opening in the circumferential direction of the stator being denoted as k1; The rotor is rotatably disposed in the mounting cavity, and the rotor includes a rotor core, and the rotor core includes: Core body; an axial hole, provided in the core body; a plurality of magnet slot groups provided in the core body, the plurality of magnet slot groups being spaced apart around the axial hole, each magnet slot group comprising two magnet slots, each magnet slot comprising a first slot end proximal to the axial hole, a second slot end distal to the axial hole, and a straight slot section, the straight slot section being connected between the first slot end and the second slot end, the first slot ends of the two magnet slots being closely adjacent to each other, the second slot ends of the two magnet slots being distal to each other, an angle α being formed between the straight slot sections of the two magnet slots, and a circumferential width H being provided; a plurality of magnetic tuning slot groups, provided on the core body, wherein one magnetic tuning slot group is provided between each of the magnet slot groups and the outer peripheral wall of the core body, each of the magnetic tuning slot groups including a plurality of magnetic tuning slots, the plurality of magnetic tuning slots including a first magnetic tuning slot and two second magnetic tuning slots, the first magnetic tuning slot being located between the two second magnetic tuning slots, the first magnetic tuning slot and the second magnetic tuning slot both including a third slot end close to the axial hole, a fourth slot end away from the axial hole, and a connecting slot section, the connecting slot section being connected between the third slot end and the fourth slot end, the third slot ends of the two second magnetic tuning slots being away from each other, the fourth slot ends of the two second magnetic tuning slots being close to each other, the angle between the slot walls of the connecting slot section of the first magnetic tuning slot and the connecting slot section of the second magnetic tuning slot being close to each other being θ, and the width of the magnetic tuning slot in the circumferential direction of the rotor being denoted as k2; An air gap is enclosed between the stator and the rotor, and the minimum value of the air gap in the direction from the rotor to the stator is denoted as δ; Among them, k1×0.25≤1.25×α×k2×δ / (θ×H)≤t.

2. The motor according to claim 1, wherein The first magnetic tuning groove is located on the magnetic pole center line of the core body, and the length of the first magnetic tuning groove is less than or equal to the length of the second magnetic tuning groove.

3. The motor according to claim 2, wherein The two second magnetic tuning slots in each magnetic tuning slot group are symmetrically arranged with the magnetic pole center line as the symmetry axis.

4. The electric machine according to any one of claims 1 to 3, wherein The rotor core further comprises: A plurality of rivet buckles are provided on the core body, and at least one rivet buckle is provided between each magnet slot group and the outer peripheral wall of the core body.

5. The motor according to claim 4, wherein The rivet portion is located between the first magnetic tuning groove and the second magnetic tuning groove.

6. The motor according to claim 2 or 3, wherein: In each of the magnetic tuning slot groups, the plurality of magnetic tuning slots further include: Two third magnetic tuning slots, each of the second magnetic tuning slots is located between the two third magnetic tuning slots, each of the third magnetic tuning slots includes the third slot end, the fourth slot end and the connecting slot section, the third slot ends of the two third magnetic tuning slots are far away from each other, and the fourth slot ends of the two third magnetic tuning slots are close to each other.

7. The motor according to claim 6, wherein The two third magnetic tuning grooves are symmetrically arranged with the magnetic pole center line as the symmetry axis, and the second magnetic tuning groove and the third magnetic tuning groove located on the same side of the magnetic pole center line are arranged in parallel.

8. The motor according to claim 6 or 7, wherein The length of the third magnetic tuning groove is smaller than the length of the second magnetic tuning groove.

9. The electric machine according to any one of claims 1 to 8, wherein θ and t satisfy: 0.5° / mm<θ / t<3.6° / mm.

10. The electric machine according to any one of claims 1 to 9, wherein Also includes: A plurality of permanent magnets are provided, each of the magnet slots is provided with one permanent magnet, and the permanent magnets contain X% of cerium by mass, wherein 1%<X%<5%.

11. The electric machine according to any one of claims 1 to 10, wherein The minimum value t of the circumferential width of the tooth body is greater than or equal to 7 mm and less than or equal to 9 mm.

12. The electric machine according to any one of claims 1 to 11, wherein The distance between the magnetic tuning slot group and the outer peripheral wall of the core body is d1, and the minimum value of d1 is greater than or equal to 0.4 mm; The distance between the magnetic tuning slot group and the magnet slot group is d2, and the minimum value of d2 is greater than or equal to 0.4 mm.

13. A compressor, wherein: include: A motor as claimed in any one of claims 1 to 12.

14. A vehicle, wherein: include: The motor according to any one of claims 1 to 12; or The compressor of claim 13.

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